Short-long wall intermittent filling mining and alkali solid waste CO2 storage system and method

Abstract

The present invention discloses a short-long wall intermittent filling mining and alkali solid waste CO2 storage system and method, wherein the storage system includes a CO2 storage structure, an alkali solid waste and CO2 pipeline transportation system and a CO2 storage monitoring system; the storage method includes the following steps: 1. preparing the alkali solid waste to be disposed and the CO2 to be sealed; 2. designing a short-long wall intermittent filling coal-pillar-free mining method; 3. adopting a short-long wall intermittent filling coal-pillar-free mining method to mine the mining area, and constructing a CO2 storage structure during the mining process, connecting the alkali solid waste and CO2 pipeline transportation system and the CO2 storage monitoring system; 4. transporting the alkali solid waste to be disposed and the CO2 to be sealed to the CO2 storage structure. The present invention enriches the CO2 storage types, provides a new idea for the exploration of CO2 storage repositories, can safely and effectively store CO2, reduce CO2 emissions, and alleviate the impact of greenhouse effects caused by carbon emissions on humans.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mining and CO2 storage, and specifically relates to a system and method for short-long wall intermittent filling mining coordinated with alkaline solid waste CO2 storage. Background Art

[0002] At present, there are three main ways to manage CO2: storage, separation and recovery, and effective conversion. Among them, storage mainly includes geological storage, marine storage, chemical fixation, and mineralization storage; separation and recovery mainly include membrane separation, auxiliary material adsorption separation, and absorption separation; and effective conversion methods mainly include absorption by algae and vegetation photosynthesis. There are also many problems with the above technologies. For example, (1) The principle of geological storage of CO2 is very similar to the principle of geological storage of natural gas in nature, and has great potential for storing CO2 gas. However, due to geographical restrictions or lack of suitable storage strata and underground capacity, there are leakage risks and many uncertainties; (2) Marine storage is currently in the experimental exploration stage. At the same time, once CO2 leaks, it is easy to cause seawater acidification and damage marine biodiversity. In addition, due to the long distance between it and the CO2 gas emission source, the long-distance transportation cost is also one of the factors limiting the development of marine storage; (3) Chemical reagent fixation or conversion, due to the slow carbonation reaction rate and low conversion efficiency, is far from the level of industrial application. (4) Mineralization storage requires high temperature and high pressure conditions, high energy consumption, complex processes, and it is not easy to obtain high value-added products. It has poor economic efficiency and is still a long way from industrial application.

[0003] In recent years, CO2 emissions from large coal-fired power plants and chemical plants using fossil fuels have increased dramatically, far exceeding the total amount that can be processed by the above existing storage technologies, and need to be stored or industrially converted and utilized through other means. In order to solve the above problems, experts and scholars have conducted a lot of research and achieved certain research results. For example,

[0004] The patent discloses a method for storing CO2 in the goaf of an abandoned coal mine. In the goaf of an abandoned coal mine, it is necessary to control rock movement, set up and reinforce isolation coal pillars, set up isolation walls, inject grouting to plug gaps, and artificially set up independent closed storage spaces to store CO2. However, there are problems such as the waste of coal resources caused by artificially leaving coal pillars, the large amount of grouting and plugging work, huge cost, long time period, and high cost. At the same time, there are many risks in entering the abandoned mine for construction, such as: (1) There may be roof collapse in the tunnels and goafs under the abandoned mine. When personnel enter the abandoned mine for construction, they need to re-maintain the tunnels, re-ventilate and re-supply electricity, which increases additional costs; (2) There is accumulated water and gas in the abandoned mine, which is potentially dangerous and has low safety protection for personnel; (3) The collapse of the roof of the tunnels or goafs in the abandoned mines can easily form cracks that penetrate the ground, resulting in poor sealing of the storage space, and the escape of CO2 gas into the aquifer, soil or air, which can easily lead to problems such as groundwater quality and soil acidification. (4) Secondary disasters: local concentration is too high and support is required, resulting in casualties; storage space is small.

[0005] Patent: A method and system for underground carbon dioxide storage based on coal mine goafs. It is necessary to use an artificial dam to connect the residual coal pillars in the goafs left by traditional mining methods to form an underground confined space. The CO2 is solidified by mixing air and CO2 to cultivate algae. The traditional mining method wastes coal resources by leaving coal pillars. CO2 needs to be mixed with air, and the process is complicated and the storage volume is small. At the same time, there is no support in the goaf, and the goaf is prone to collapse, resulting in poor air tightness of the storage space. The algae solution is easy to leak and damage groundwater. Algae, biological storage, consumes itself and releases CO2. When the underground temperature is high, algae cannot survive; there is no oxygen underground, and algae need to reproduce, which takes a long time. The raw materials are limited and cannot solidify a large amount of CO2. In addition, cultivation requires a lot of manpower and material resources.

[0006] The patent discloses a method for sealing and solidifying CO2 by filling the goaf of a mine with foamed geopolymer. This method uses CO2 as the foam filling gas and requires the addition of a foaming agent. It can only use foamed concrete to temporarily seal CO2 gas, which has problems such as complex ground preparation process, high preparation cost, and small storage volume. At the same time, the untreated goaf has poor sealing, and the CO2 in the foam can easily diffuse into the aquifer and soil, acidifying the groundwater and soil, causing secondary damage to the ecological environment. Secondly, CO2 can easily diffuse into the mining tunnel, causing the underground air quality to deteriorate, threatening the safety of workers.

[0007] Patent: A mining microbial cementing filling material for mineralization and storage of CO2 and its preparation method. Microorganisms and calcium sources need to be added to the filling material. The microorganisms first convert CO2 into CO3 2-, and then react with the calcium source to form carbonate, increasing the mineralization reaction process and increasing the filling cost. In addition, the calcium source added is an aqueous solution of calcium chloride, calcium nitrate or calcium acetate, which cannot avoid the impact of the prepared filling material on groundwater in the well. Slow speed, difficult survival, slow sealing speed

[0008] Existing technologies cannot solve the following problems: (1) Safely and effectively store CO2 in goafs to prevent leakage from affecting groundwater, soil and underground air quality; (2) Storing CO2 in goafs underground requires the use of coal pillars left by traditional mining methods, which wastes coal resources; (3) Coal mining, solid waste disposal, goaf management and CO2 storage cannot be carried out in a coordinated manner, and tunnels need to be maintained, ventilation and electricity supply need to be carried out, which increases additional work and costs; (4) After the goaf collapses, the storage space is reduced and the storage volume is limited. Artificial space needs to be constructed, which increases additional costs and high storage costs; (5) Other materials need to be added during storage, which not only increases costs but also has new impacts on the environment; (6) The status after storage cannot be monitored, and the safety of CO2 after storage and the underground ecological environment cannot be guaranteed. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide a short-long wall intermittent filling mining coordinated alkaline solid waste CO2 storage system in response to the deficiencies in the above-mentioned prior art, which enriches the CO2 storage types and provides new ideas for the exploration of CO2 storage bins; it forms a coordinated and green model of efficient recovery of coal resources - large-scale disposal of solid waste - reuse of goaf areas - CO2 storage.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is: a short-long wall intermittent filling mining and alkali solid waste CO2 storage system, characterized in that it includes:

[0011] CO2 storage structure: It is constructed by short-long wall intermittent filling without coal pillar mining method, enclosing multiple closed CO2 storage spaces for storing alkali solid waste and CO2 transported by alkali solid waste and CO2 pipeline transportation system;

[0012] Alkali solid waste and CO2 pipeline transportation system: used to transport CO2 and alkali solid waste into the CO2 storage space, and discharge the gas in the CO2 storage space out of the CO2 storage space; including a CO2 transportation pipeline and an alkali solid waste transportation pipeline that pass through the CO2 storage structure from the outside and enter the CO2 storage space, and an exhaust pipeline that passes from the CO2 storage space to the outside of the CO2 storage structure;

[0013] CO2 storage monitoring system: used to monitor the CO2 storage process.

[0014] The above-mentioned short-long wall intermittent filling mining and alkaline solid waste CO2 storage system, the CO2 storage structure includes multiple airtight filling bodies, multiple spacer filling bodies, top plates, bottom plates and sealing and anti-seepage treatment components, multiple airtight filling bodies are arranged in multiple rows and intervals perpendicular to the main lane, the lane between two adjacent airtight filling bodies is a filling lane, the setting direction of the spacer filling body is perpendicular to the setting direction of the airtight filling body, multiple spacer filling bodies are arranged in multiple rows and intervals, and both ends of the spacer filling body are on the short strip With filling body; each of the CO2 storage spaces is surrounded by side walls, a top plate and a bottom plate, the side wall is composed of two adjacent spacer filling bodies, an airtight filling body located on one side of the spacer filling body, an airtight filling body located on the other side of the spacer filling body, and a sealing door arranged on the airtight filling body; the sealing and anti-seepage treatment component includes a top sealing and anti-seepage treatment structure arranged at the bottom of the top plate, a side wall sealing and anti-seepage treatment structure arranged on the side wall and a bottom sealing and anti-seepage treatment structure arranged at the top of the bottom plate.

[0015] In the above-mentioned short-long wall intermittent filling mining and alkaline solid waste CO2 storage system, each airtight filling body includes a plurality of short strip filling bodies arranged at intervals, and a connecting tunnel is between two adjacent short strip filling bodies. Each of the CO2 storage spaces is surrounded by side walls, a top plate and a bottom plate. The side walls are composed of two adjacent interval filling bodies, one or two short strip filling bodies located on one side of the interval filling body, one or two short strip filling bodies located on the other side of the interval filling body, and a sealing door arranged on the short strip filling body or in the connecting tunnel.

[0016] In the above-mentioned short-long wall intermittent filling mining coordinated alkaline solid waste CO2 storage system, a top net is suspended on the top plate, and the top plate and the top net are reinforced by anchor rods. The top sealing and anti-seepage treatment structure includes a top shotcrete layer formed by slurry sprayed on the top plate and the top net, and a top anti-seepage layer formed by anti-seepage material sprayed on the top shotcrete layer; the side wall sealing and anti-seepage treatment structure includes a side wall anti-seepage layer formed by anti-seepage material sprayed on the short strip filling body and the spacer filling body; the bottom sealing and anti-seepage treatment structure includes a bottom shotcrete layer formed by slurry sprayed on the bottom plate, and a bottom anti-seepage layer formed by anti-seepage material sprayed on the bottom shotcrete layer.

[0017] In the above-mentioned short-long wall intermittent filling mining coordinated alkali solid waste CO2 storage system, when all the CO2 to be sealed is in gaseous state, the CO2 conveying pipeline is used to convey the gaseous CO2 to be sealed, and the alkali solid waste conveying pipeline is used to convey the alkali solid waste in slurry state; the CO2 conveying pipeline is connected to the CO2 gas storage tank arranged on the ground, and the CO2 conveying pipeline is provided with a CO2 intake pump and a CO2 intake control valve; the alkali solid waste conveying pipeline is connected to the pulping station arranged on the ground, and the alkali solid waste conveying pipeline is provided with an alkali solid waste conveying pump and an alkali solid waste conveying control valve; the exhaust pipeline is provided with an exhaust control valve, and the CO2 storage monitoring system includes a controller and a sensor connected to the input end of the controller. The sensor group includes an intake pressure sensor, an intake flow sensor and an intake temperature sensor arranged on the CO2 delivery pipeline, an exhaust CO2 concentration sensor, an exhaust pressure sensor and an exhaust temperature sensor arranged on the exhaust pipeline, an alkali solid waste flow sensor arranged on the alkali solid waste delivery pipeline, a PH sensor and a metal ion concentration sensor arranged in the bottom drainage ditch of the filling lane, and an in-lane CO2 concentration sensor, an in-lane CO concentration sensor, an in-lane CH4 concentration sensor and an in-lane O2 concentration sensor arranged in the filling lane; the CO2 intake pump, the CO2 intake control valve, the exhaust control valve, the alkali solid waste delivery pump and the alkali solid waste delivery control valve are all connected to the output end of the controller;

[0018] When part of the CO2 to be sealed is in gaseous state and part is in liquid state, the CO2 conveying pipeline is used to convey the gaseous CO2 to be sealed, and the alkali solid waste conveying pipeline is used to convey the alkali solid waste in slurry state and the liquid CO2 to be sealed; the alkali solid waste conveying pipeline is connected to the alkali solid waste conveying pipeline, the liquid CO2 conveying pipeline is connected to the liquid CO2 storage tank, and the liquid CO2 conveying pipeline is provided with a liquid CO2 conveying control valve and a liquid CO2 conveying pump; the CO2 conveying pipeline is connected to the CO2 gas storage tank arranged on the ground, the CO2 conveying pipeline is provided with a CO2 intake pump and a CO2 intake control valve, the alkali solid waste conveying pipeline is connected to the pulping station arranged on the ground, and the alkali solid waste conveying pipeline is provided with an alkali solid waste conveying pump and an alkali solid waste conveying control valve; the exhaust pipeline is provided with an exhaust control valve, and the CO2 storage monitoring system includes a controller and a control valve connected to the input end of the controller. A sensor group, the sensor group includes an intake pressure sensor, an intake flow sensor and an intake temperature sensor arranged on a CO2 delivery pipeline, an exhaust CO2 concentration sensor, an exhaust pressure sensor and an exhaust temperature sensor arranged on an exhaust pipeline, an alkali solid waste flow sensor arranged on an alkali solid waste delivery pipeline, a liquid CO2 pressure sensor, a liquid CO2 temperature sensor and a liquid CO2 flow sensor arranged on a liquid CO2 delivery pipeline, a PH sensor and a metal ion concentration sensor arranged in a drainage ditch at the bottom of a filling lane, and an in-lane CO2 concentration sensor, an in-lane CO concentration sensor, an in-lane CH4 concentration sensor and an in-lane O2 concentration sensor arranged in the filling lane; the CO2 intake pump, the CO2 intake control valve, the exhaust control valve, the alkali solid waste delivery pump, the alkali solid waste delivery control valve, the liquid CO2 delivery control valve and the liquid CO2 delivery pump are all connected to the output end of the controller;

[0019] When all the CO2 to be sealed is in liquid state, the alkali solid waste conveying pipeline is used to convey alkali solid waste in slurry state and liquid CO2 to be sealed; the alkali solid waste conveying pipeline is connected to the alkali solid waste conveying pipeline, the liquid CO2 conveying pipeline is connected to the liquid CO2 storage tank, and the liquid CO2 conveying pipeline is provided with a liquid CO2 conveying control valve and a liquid CO2 conveying pump; the alkali solid waste conveying pipeline is connected to a pulping station arranged on the ground, and the alkali solid waste conveying pipeline is provided with an alkali solid waste conveying pump and an alkali solid waste conveying control valve; the exhaust pipeline is provided with an exhaust control valve, and the CO2 storage monitoring system includes a controller and a sensor group connected to the input end of the controller, and the sensor group includes a sensor group arranged An exhaust CO2 concentration sensor, an exhaust pressure sensor and an exhaust temperature sensor on the exhaust pipe, an alkali solid waste flow sensor arranged on the alkali solid waste conveying pipeline, a liquid CO2 pressure sensor, a liquid CO2 temperature sensor and a liquid CO2 flow sensor arranged on the liquid CO2 conveying pipeline, a PH sensor and a metal ion concentration sensor arranged in the bottom drainage ditch of the filling lane, and an in-lane CO2 concentration sensor, an in-lane CO concentration sensor, an in-lane CH4 concentration sensor and an in-lane O2 concentration sensor arranged in the filling lane; the exhaust control valve, the alkali solid waste conveying pump, the alkali solid waste conveying control valve, the liquid CO2 conveying control valve and the liquid CO2 conveying pump are all connected to the output end of the controller.

[0020] The present invention also discloses a method for short-long wall intermittent filling mining and alkali solid waste CO2 storage, the method comprising the following steps:

[0021] Step 1: Prepare the alkali solid waste to be disposed of and the CO2 to be sealed;

[0022] Step 2: Design a short-long wall intermittent filling coal pillar-free mining method;

[0023] Step 3: The mining area is mined by short-long wall intermittent filling without coal pillars, and a CO2 storage structure is constructed during the mining process, connecting the alkali solid waste and CO2 pipeline transportation system and the CO2 storage monitoring system;

[0024] Step 4: transport the alkaline solid waste to be disposed of and the CO2 to be sealed to the CO2 storage structure.

[0025] In the above method, when the alkali solid waste to be disposed and the CO2 to be sealed are prepared in step 1, the alkali solid waste includes slurry-type alkali solid waste and solid-type alkali solid waste, the gaseous CO2 to be sealed is stored in a CO2 gas storage tank, and the liquid CO2 is stored in a liquid CO2 liquid storage tank;

[0026] The short-long wall discontinuous filling coal-pillar-free mining method described in step 2 divides the mining area into a preparation working face and a plurality of continuous short-long wall discontinuous filling coal-pillar-free mining working faces, each of which includes a preparation working face and a short wall mining working face arranged in sequence;

[0027] The specific process of adopting the short-long wall intermittent filling non-pillar mining method to mine the mining area in step 3, constructing a CO2 storage structure during the mining process, and connecting the alkali solid waste and CO2 pipeline transportation system and the CO2 storage monitoring system is as follows:

[0028] Step 301, mining the prepared working surface;

[0029] Step 302, mining multiple short-long wall discontinuous filling coal pillar-free mining faces in sequence, when mining each short-long wall discontinuous filling coal pillar-free mining face, first mine the short wall mining face to form multiple short strip filling bodies; then mine the long wall mining face to form multiple interval filling bodies; when mining the long wall mining face, whenever a space is formed between two interval filling bodies, the roof is reinforced, a top sealing and anti-seepage treatment structure, a side wall sealing and anti-seepage treatment structure and a bottom sealing and anti-seepage treatment structure are set, and a sealing door is set on the short strip filling body or in the connecting tunnel; two adjacent interval filling bodies, one or two short strip filling bodies located on one side of the interval filling body, one or two short strip filling bodies located on the other side of the interval filling body, and a sealing door set on the short strip filling body or in the connecting tunnel constitute the side wall of the CO2 storage space, and the side wall of the CO2 storage space, the reinforced roof and the bottom plate enclose a CO2 storage space;

[0030] Step 303, connecting the base solid waste and CO2 pipeline transportation system;

[0031] Step 304: Connect to the CO2 storage monitoring system.

[0032] In the above method, the prepared working face is a five-strip short-wall mining working face;

[0033] The short-wall mining face in the short-long wall discontinuous filling coal-pillar-free mining face is a five-strip short-wall mining face; the specific method of mining a plurality of short-long wall discontinuous filling coal-pillar-free mining faces in sequence and constructing a CO2 storage structure during the mining process described in step 302 includes a method of mining the short-wall mining face and the preparatory face in the short-long wall discontinuous filling coal-pillar-free mining face;

[0034] The method for mining the short-wall mining face in the short-long wall intermittent filling coal pillar-free mining face is the same as the method for mining the preparation face in step 301 and is:

[0035] Step A1, dividing the short-wall mining working face into three excavation working faces and two strip-type filling mining working faces spaced between the three excavation working faces in a direction perpendicular to the main tunnel;

[0036] Step A2: Use narrow strip filling mining method to mine the strip filling mining face; the specific method is:

[0037] Step A201, dividing the strip filling mining working face into m narrow strips, and dividing each narrow strip into n short strips along the direction parallel to the main roadway, and the gap between two adjacent short strips is a connecting roadway; wherein the values ​​of m and n are both non-zero natural numbers;

[0038] Step A202, mining m narrow strips; wherein the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main tunnel, and then using filling materials to fill n short strips in sequence to form n short strip filling bodies;

[0039] Step A3: Use a roadheader or a continuous miner to dig three tunnels away from the main tunnel at the excavation working face, with the middle tunnel serving as a mining tunnel or a filling tunnel, and the two tunnels on both sides serving as mining tunnels;

[0040] The method for mining the preparation working face in the short-long wall intermittent filling non-coal pillar mining working face is to mine the preparation working face using a comprehensive mechanized coal mining process; when the preparation working face is mined using a comprehensive mechanized coal mining process, each time the maximum width L of the sealed space is reached, max Previously, filling materials were used to carry out strip filling parallel to the main tunnel direction to form multiple interval filling bodies until the longwall mining face was mined;

[0041] When the basic top is assumed to be a plate fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ;

[0042] When the basic top is assumed to be a beam fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ;

[0043] Among them, L max The unit is m; w is the total thickness of the rock layers that make up the basic top, in m; h i is the thickness of the i-th rock layer above the basic top, in m, i is a natural number from 1 to n, n is the total number of rock layers above the basic top; h1 is the thickness of the basic top, in m; μ is the Poisson's ratio of the basic top; R T is the tensile strength of the basic top rock layer of the coal seam, in MPa;i is the bulk density of the i-th rock layer from the basic top, in MN / m 3 ; E i is the elastic modulus of the i-th rock layer from the basic top, in MPa; E1 is the elastic modulus of the basic top, in MPa.

[0044] In the above method, the method of connecting the base solid waste and CO2 pipeline transportation system in step 303 includes the following three situations:

[0045] Case 1: When all the CO2 to be stored is in gaseous state, the specific process is as follows:

[0046] Step 303A1, inserting a CO2 delivery pipeline extending into the CO2 storage space into the lower part of the short strip filling body located at one side of the CO2 storage space, connecting a CO2 air intake pump and a CO2 air intake control valve to the CO2 delivery pipeline, and connecting the CO2 delivery pipeline to a CO2 gas storage tank disposed on the ground;

[0047] Step 303A2, inserting an exhaust pipe and an alkali solid waste conveying pipe extending into the CO2 storage space into the upper part of the short strip filling body located on the other side of the CO2 storage space, connecting an exhaust control valve to the CO2 conveying pipe, connecting the alkali solid waste conveying pipe to the pulping station on the ground, and connecting an alkali solid waste conveying pump and an alkali solid waste conveying control valve to the alkali solid waste conveying pipe;

[0048] Case 2: When the CO2 to be stored is partly gaseous and partly liquid, the specific process is as follows:

[0049] Step 303B1, inserting a CO2 delivery pipeline extending into the CO2 storage space into the lower part of the short strip filling body located at one side of the CO2 storage space, connecting a CO2 air intake pump and a CO2 air intake control valve to the CO2 delivery pipeline, and connecting the CO2 delivery pipeline to a CO2 gas storage tank disposed on the ground;

[0050] Step 303B2, connecting a liquid CO2 delivery pump and a liquid CO2 delivery control valve to the liquid CO2 delivery pipeline, and connecting the liquid CO2 delivery pipeline to the liquid CO2 storage tank;

[0051] Step 303B3, inserting an exhaust pipe and an alkali solid waste conveying pipe extending into the CO2 storage space into the upper part of the short strip filling body located on the other side of the CO2 storage space, connecting an exhaust control valve to the CO2 exhaust pipe, connecting the alkali solid waste conveying pipe to the pulping station on the ground, and connecting an alkali solid waste conveying pump and an alkali solid waste conveying control valve to the alkali solid waste conveying pipe;

[0052] Case 3: When all the CO2 to be stored is in liquid form, the specific process is as follows:

[0053] Step 303C1, connecting a liquid CO2 delivery pump and a liquid CO2 delivery control valve to the liquid CO2 delivery pipeline, and connecting the liquid CO2 delivery pipeline to the liquid CO2 storage tank;

[0054] Step 303C2, inserting an exhaust pipe and an alkali solid waste conveying pipe extending into the CO2 storage space into the upper part of the short strip filling body located on the other side of the CO2 storage space, connecting an exhaust control valve to the CO2 exhaust pipe, connecting the alkali solid waste conveying pipe to the pulping station on the ground, and connecting an alkali solid waste conveying pump and an alkali solid waste conveying control valve to the alkali solid waste conveying pipe;

[0055] The method of connecting to the CO2 storage monitoring system in step 304 includes the following three cases:

[0056] Case 1: When all the CO2 to be stored is in gaseous state, the specific process is as follows:

[0057] Step 304A1, connecting an intake pressure sensor, an intake flow sensor and an intake temperature sensor to the CO2 delivery pipeline;

[0058] Step 304A2, connecting an exhaust CO2 concentration sensor, an exhaust pressure sensor and an exhaust temperature sensor to the exhaust pipe;

[0059] Step 304A3, connecting a base solid waste flow sensor to the base solid waste conveying pipeline;

[0060] Step 304A4, setting a CO2 concentration sensor, a CO concentration sensor, a CH4 concentration sensor and an O2 concentration sensor in the lane in the lane for filling and retaining;

[0061] Step 304A5: Install a pH sensor and a metal ion concentration sensor in the bottom drainage ditch of the filling lane;

[0062] Step 304A6, connecting the output ends of the intake pressure sensor, intake flow sensor, intake temperature sensor, exhaust CO2 concentration sensor, exhaust pressure sensor, exhaust temperature sensor, alkali solid waste flow sensor, pH sensor, metal ion concentration sensor, CO2 concentration sensor in the lane, CO concentration sensor in the lane, CH4 concentration sensor in the lane, and O2 concentration sensor in the lane to the input end of the controller;

[0063] Step 304A7, connect the CO2 air intake pump, the CO2 air intake control valve, the exhaust control valve, the alkali solid waste delivery pump and the alkali solid waste delivery control valve to the output end of the controller;

[0064] Case 2: When the CO2 to be stored is partly gaseous and partly liquid, the specific process is as follows:

[0065] The specific process of connecting to the CO2 storage monitoring system in step 304 is as follows:

[0066] Step 304B1, connecting an intake pressure sensor, an intake flow sensor and an intake temperature sensor to the CO2 delivery pipeline;

[0067] Step 304B2, connecting a liquid CO2 pressure sensor, a liquid CO2 temperature sensor and a liquid CO2 flow sensor to the liquid CO2 delivery pipeline;

[0068] Step 304B3, connecting an exhaust CO2 concentration sensor, an exhaust pressure sensor and an exhaust temperature sensor to the exhaust pipe;

[0069] Step 304B4, connecting a base solid waste flow sensor to the base solid waste conveying pipeline;

[0070] Step 304B5, setting a CO2 concentration sensor in the lane, a CO concentration sensor in the lane, a CH4 concentration sensor in the lane, and an O2 concentration sensor in the lane in the lane;

[0071] Step 304B6, installing a pH sensor and a metal ion concentration sensor in the bottom drainage ditch of the filling lane;

[0072] Step 304B7, connect the output ends of the intake pressure sensor, intake flow sensor, intake temperature sensor, exhaust CO2 concentration sensor, exhaust pressure sensor, exhaust temperature sensor, alkali solid waste flow sensor, liquid CO2 pressure sensor, liquid CO2 temperature sensor and liquid CO2 flow sensor, pH sensor, metal ion concentration sensor, in-lane CO2 concentration sensor, in-lane CO concentration sensor, in-lane CH4 concentration sensor and in-lane O2 concentration sensor to the input end of the controller;

[0073] Step 304B8, connect the CO2 air intake pump, the CO2 air intake control valve, the exhaust control valve, the liquid CO2 delivery pump, the liquid CO2 delivery control valve, the alkali solid waste delivery pump and the alkali solid waste delivery control valve to the output end of the controller;

[0074] Case 3: When all the CO2 to be stored is in liquid form, the specific process is as follows:

[0075] Step 304C1, connecting a liquid CO2 pressure sensor, a liquid CO2 temperature sensor and a liquid CO2 flow sensor to the liquid CO2 delivery pipeline;

[0076] Step 304C2, connecting an exhaust CO2 concentration sensor, an exhaust pressure sensor and an exhaust temperature sensor to the exhaust pipe;

[0077] Step 304C3, connecting a base solid waste flow sensor to the base solid waste conveying pipeline;

[0078] Step 304C4, setting a CO2 concentration sensor, a CO concentration sensor, a CH4 concentration sensor and an O2 concentration sensor in the lane in the lane for filling and retaining;

[0079] Step 304C5: Install a pH sensor and a metal ion concentration sensor in the bottom drainage ditch of the filling lane.

[0080] Step 304C6, connect the output ends of the exhaust CO2 concentration sensor, the exhaust pressure sensor, the exhaust temperature sensor, the alkali solid waste flow sensor, the liquid CO2 pressure sensor, the liquid CO2 temperature sensor and the liquid CO2 flow sensor, the pH sensor, the metal ion concentration sensor, the in-lane CO2 concentration sensor, the in-lane CO concentration sensor, the in-lane CH4 concentration sensor and the in-lane O2 concentration sensor to the input end of the controller;

[0081] Step 304C7, connect the exhaust control valve, the liquid CO2 delivery pump, the liquid CO2 delivery control valve, the alkali solid waste delivery pump and the alkali solid waste delivery control valve to the output end of the controller.

[0082] In the above method, the method of transporting the alkali solid waste to be disposed and the CO2 to be sealed to the CO2 sealing structure in step 4 includes a method of transporting the alkali solid waste to be disposed to the CO2 sealing structure and a method of transporting the CO2 to be sealed to the CO2 sealing structure, wherein the method of transporting the alkali solid waste to be disposed to the CO2 sealing structure includes the following three situations:

[0083] Case I: When the alkali solid waste to be disposed needs to be stored in the CO2 storage structure in a solid state, the sealed door is opened and the alkali solid waste is directly stored in the CO2 storage structure;

[0084] Case II: When all the alkali solid waste to be disposed needs to be stored in the CO2 storage structure in a slurry state, the slurry feed button is activated, and the controller controls the alkali solid waste delivery pump and the alkali solid waste delivery control valve, and the alkali solid waste in a slurry state after being processed by the pulping station enters the CO2 storage space through the alkali solid waste delivery pipeline;

[0085] Case III: When the alkali solid waste to be disposed needs to be stored partially in a solid state in the CO2 storage structure and partially in a slurry state in the CO2 storage structure, first open the sealing door, store the solid alkali solid waste in the CO2 storage structure, then start the slurry feed button, the controller controls the alkali solid waste delivery pump and the alkali solid waste delivery control valve to open, and the alkali solid waste in a slurry state after being processed by the pulping station enters the CO2 storage space through the alkali solid waste delivery pipeline;

[0086] Among them, the method of transporting the CO2 to be stored into the CO2 storage structure includes the following three cases:

[0087] Case 1: When all the CO2 to be stored is in gaseous form, the gaseous CO2 to be stored is transported to the CO2 storage structure in gaseous form;

[0088] Case 2: When part of the CO2 to be stored is gaseous and part is liquid, the gaseous CO2 to be stored is transported to the CO2 storage structure in gaseous form, and the liquid CO2 to be stored is transported to the CO2 storage structure in liquid form, and the two states of CO2 are transported simultaneously or one after the other;

[0089] Case 3: When all the CO2 to be stored is in liquid form, the liquid CO2 to be stored is transported to the CO2 storage structure in liquid form;

[0090] The method for conveying the gaseous CO2 to be sealed in the CO2 sealing structure in the form of gas is as follows: starting the CO2 intake button, the controller controls the CO2 intake pump and the CO2 intake control valve to open, and controls the exhaust control valve to open, and the CO2 gas in the CO2 storage tank enters the CO2 storage space through the CO2 delivery pipeline; during the intake process, the intake pressure sensor detects the intake pressure in real time, the intake flow sensor detects the intake flow in real time, the intake temperature sensor detects the intake temperature in real time, the exhaust CO2 concentration sensor detects the CO2 concentration in the exhaust pipeline in real time, the exhaust pressure sensor detects the pressure in the exhaust pipeline in real time, and the exhaust temperature sensor detects the exhaust temperature in real time; when the CO2 concentration in the exhaust pipeline exceeds the preset CO2 concentration value, the controller controls the exhaust control valve to close and stop exhaust; when the pressure in the exhaust pipeline reaches the preset upper limit pressure value, the controller controls the CO2 intake pump and the CO2 intake control valve to close and stop intake;

[0091] The method for delivering the liquid CO2 to be sealed in the CO2 sealing structure in liquid form is as follows: start the CO2 liquid inlet button, the controller controls the liquid CO2 delivery pump, the liquid CO2 delivery control valve and the alkali solid waste delivery control valve to open, and controls the exhaust control valve to open, and the CO2 liquid in the CO2 storage tank enters the CO2 storage space through the liquid CO2 delivery pipeline and the alkali solid waste delivery pipeline; during the liquid inlet process, the exhaust CO2 concentration sensor detects the CO2 concentration in the exhaust pipeline in real time, the exhaust pressure sensor detects the pressure in the exhaust pipeline in real time, the exhaust temperature sensor detects the exhaust temperature in real time, and the liquid CO2 pressure sensor detects the liquid CO2 The pressure is detected in real time, the liquid CO2 temperature sensor detects the liquid CO2 temperature in real time, and the liquid CO2 flow sensor detects the liquid CO2 flow in real time; when the CO2 concentration in the exhaust pipe exceeds the preset CO2 concentration value, the controller controls the exhaust control valve to close and stops exhaust; when the liquid CO2 flow reaches the upper limit pressure value, the controller controls the liquid CO2 delivery pump, the liquid CO2 delivery control valve and the alkali solid waste delivery control valve to close and stop the introduction of liquid CO2; when the pressure in the exhaust pipe reaches the preset upper limit pressure value, the controller controls the liquid CO2 delivery pump, the liquid CO2 delivery control valve and the alkali solid waste delivery control valve to close and stop the introduction of liquid CO2;

[0092] Solid alkaline solid waste or alkaline solid waste in slurry state, short strip filling body, interval filling body and gaseous CO2 or liquid CO2 entering the CO2 storage structure undergo mineralization reaction with each other, such as reaction formulas (F1), (F2), (F3), (F4), and (F5):

[0093] CaO+H2O→Ca(OH)2 (F1)

[0094] MgO+H2O→Mg(OH)2 (F2)

[0095] Mg(OH)2+CO2→MgCO3+H2O (F3)

[0096] Ca(OH)2+CO2→CaCO3+H2O (F4)

[0097] 2CaO·SiO2+2H2O→CaO·SiO2·H2O+Ca(OH)2 (F5)

[0098] CaO·SiO2·H2O+CO2→CaCO3+SiO2·H2O (F6)

[0099] In the initial stage of the reaction, the solid alkali solid waste or alkali solid waste in slurry state, short strip filling body, interval filling body, β-C2S and hydration-produced Ca and Mg oxides react with CO2 to form CSH and CaCO3, MgCO3 to fill the pores of the alkali solid waste, quickly enhance the strength of the filling body, and accelerate the curing of the filling body; as the reaction proceeds, CSH reacts with CO2 to form amorphous silica gel SiO2·H20, as shown in reaction formula (F6); amorphous SiO2 acts as a cementitious material for the filling body, and CaCO3 acts as a recycled aggregate for the filling body, thereby improving the density and strength of the filling body, and effectively improving the mechanical properties and durability of the filling body; on the one hand, the rapid mineralization reaction shortens the curing period of the filling body, and the interval filling body and short strip filling body can quickly support the top plate to ensure the stability of the CO2 storage structure; on the other hand, CO2 is permanently sealed in the alkali solid waste, short strip filling body and interval filling body in the form of inorganic carbonate;

[0100] The reaction causes the pressure in the CO2 storage structure to decrease. When the pressure in the exhaust pipe drops to a preset lower pressure value, the controller controls the CO2 intake pump and the CO2 intake control valve to open, or the controller controls the CO2 intake pump, the CO2 intake control valve, the liquid CO2 delivery pump, the liquid CO2 delivery control valve and the alkali solid waste delivery control valve to open, or the controller controls the liquid CO2 delivery pump, the liquid CO2 delivery control valve and the alkali solid waste delivery control valve to open and continue to intake.

[0101] Compared with the prior art, the present invention has the following advantages:

[0102] 1. The present invention adopts a short-long wall interval filling mining method. In the short-long wall working face mining process, an airtight filling body, an interval filling body, a reinforced roof and a floor are used to construct a CO2 storage space. The interval filling body and the airtight filling body in the goaf effectively support the roof, and the roof is kept intact. At the same time, the storage space is treated with anti-seepage treatment, which has the advantages of good airtightness, strong stability and high safety.

[0103] 2. The present invention adopts a short-long wall interval filling mining method, which can achieve coal pillar-free mining and improve the coal recovery rate;

[0104] 3. The present invention uses interval filling bodies and airtight filling bodies to support the goaf, which can effectively maintain the stability of the goaf, avoid major geological disasters such as surface subsidence, aquifer loss, mining earthquakes, landslides, and mud-rock flows caused by roof collapse, solve the damage of surface collapse to cultivated land soil, and reduce economic losses;

[0105] 4. The filling material of the present invention is a full solid waste filling material, and the cementitious material does not need to use cement, which can greatly reduce the filling cost; at the same time, alkaline solid waste (magnesium slag, fly ash, coal gangue, etc.) can be stored in the CO2 storage space, and the disposal and resource utilization of solid waste can be realized while filling and CO2 sealing, which can provide a new type of large-scale solid waste disposal mode, reduce the large amount of land resources occupied by solid waste storage and the impact on the surface ecological environment;

[0106] 5. The present invention is provided with a CO2 storage monitoring system to detect the CO2 in the storage space and the tunnel in real time. Once a leak occurs, an emergency response will be made immediately to ensure the safety of CO2 storage;

[0107] 6. In the sealed space of the present invention, there are more CaO, MgO, etc. in the stored alkali solid waste and filling materials, which react with CO2 to form carbonate and amorphous silica gel, which fill the pores of the alkali solid waste and the filling body, quickly enhance the strength of the filling body, and accelerate the maintenance of the filling body. A CO2 sealing method with chemical solidification as the main method and physical sealing as the auxiliary method can be provided. Chemical solidification can permanently seal CO2, with a large CO2 storage capacity and a high curing rate;

[0108] 7. The sources of CO2 stored in the present invention are mainly coal processing and utilization related enterprises, such as power plants, coal chemical plants and magnesium metal enterprises distributed around coal mines. The CO2 gas emission is close to the storage location, and the transportation cost is low. CO2 is stored in the storage space constructed based on the short-long wall interval filling mining method, realizing a closed-loop green treatment mode of CO2 from coal mines to coal mines.

[0109] 8. The present invention realizes the management and reuse of goafs. The new functions of goafs can be expanded by using the constructed storage space to store CO2, providing a new concept from goaf management to goaf utilization; forming a coordinated and green model of efficient recovery of coal resources, large-scale disposal of solid waste, reuse of goafs, and CO2 storage integration;

[0110] 9. The present invention helps achieve the dual carbon goals, safely and effectively seals CO2, reduces CO2 emissions, and alleviates the impact of the greenhouse effect caused by carbon emissions on humans.

[0111] 10. The present invention can help surrounding enterprises to develop sustainably, for example, coal chemical industry and solid waste enterprises in northern Shaanxi, help them to achieve sustainable development, promote the sustainable development of the local economy, and help local governments achieve dual carbon goals.

[0112] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0113] Figure 1A three-dimensional diagram of the CO2 storage structure of the present invention;

[0114] Figure 2 for Figure 1 Cross-sectional view A (CO2 gas-liquid mixture);

[0115] Figure 3 for Figure 1 Cross-sectional view B (CO2 gas-liquid mixture);

[0116] Figure 4 for Figure 1 Cross-sectional view A (pure gaseous CO2);

[0117] Figure 5 for Figure 1 Cross-sectional view B (pure gaseous CO2);

[0118] Figure 6 for Figure 1 Cross-sectional view A (pure liquid CO2);

[0119] Figure 7 for Figure 1 Cross-sectional view B (pure liquid CO2);

[0120] Figure 8 A schematic diagram of a five-strip short-wall mining working face of the present invention;

[0121] Fig. 9 It is a schematic diagram of the mining process of the five-strip short-wall mining working face of the present invention;

[0122] Fig.10 The present invention is a schematic diagram of a CO2 storage monitoring system.

[0123] Description of reference numerals:

[0124] 1—CO2 delivery pipeline; 2—base solid waste and liquid CO2 delivery pipeline; 3—exhaust pipeline;

[0125] 4—liquid CO2 delivery pipeline; 5—airtight filling body; 6—interval filling body;

[0126] 7—top plate; 8—bottom plate; 9—sealing and anti-seepage treatment components; 10—main lane;

[0127] 11—filling lane; 12—short strip filling body; 13—sealed door; 14—connecting lane;

[0128] 15—top net; 16—anchor rod; 17—gas storage tank; 18—CO2 air intake pump;

[0129] 19—CO2 intake control valve; 20—liquid CO2 storage tank; 21—liquid CO2 delivery control valve;

[0130] 22—liquid CO2 delivery pump; 23—exhaust control valve; 24—pulping station;

[0131] 25—base solid waste delivery pump; 26—base solid waste delivery control valve; 27—controller;

[0132] 28—Intake air pressure sensor; 29—Intake air flow sensor; 30—Intake air temperature sensor;

[0133] 31—Exhaust CO2 concentration sensor; 32—Exhaust pressure sensor; 33—Exhaust temperature sensor;

[0134] 34—Alkali solid waste flow sensor; 35—CO2 concentration sensor in the tunnel;

[0135] 36—CO concentration sensor in the tunnel; 37—CH4 concentration sensor in the tunnel;

[0136] 38—O2 concentration sensor in the tunnel; 39—liquid CO2 pressure sensor;

[0137] 40—liquid CO2 temperature sensor; 41—liquid CO2 flow sensor;

[0138] 42—slurry feeding button; 43—CO2 air inlet button; 44—prepare the working surface;

[0139] 45—short-wall mining face; 46—long-wall mining face; 47—excavation face;

[0140] 48—strip filling mining face; 49—short strip; 50—recovery tunnel;

[0141] 51—CO2 liquid inlet button; 52—PH sensor; 53—metal ion concentration sensor. DETAILED DESCRIPTION

[0142] The following Examples 1 to 12 illustrate the short-long wall discontinuous filling mining and alkaline solid waste CO2 storage system and method of the present invention.

[0143] Example <![CDATA[CO2 Sequestration Structure]]> <![CDATA[CO2 storage status]]> Solid waste transportation status Example 1 <![CDATA[Structure for CO2 gas storage]]> Example 2 <![CDATA[Structure for liquid CO2 sequestration]]> Example 3 <![CDATA[Structure for storing CO2 in a state where part is gaseous and part is liquid]]> Example 4 <![CDATA[Method for gas sequestration of CO2]]> Gaseous solid Example 5 <![CDATA[Method of sequestering CO2 as a gas]]> Gaseous Slurry Example 6 <![CDATA[Method of sequestering CO2 as a gas]]> Gaseous Solid + slurry Example 7 <![CDATA[Method for storing CO2 in liquid state]]> Liquid solid Example 8 <![CDATA[Method for storing CO2 in liquid state]]> Liquid Slurry Example 9 <![CDATA[Method for storing CO2 in liquid state]]> Liquid Solid + slurry Example 10 <![CDATA[Method for storing CO2 with part in gaseous state and part in liquid state]]> Gas + Liquid solid Embodiment 11 <![CDATA[Method for storing CO2 with part in gaseous state and part in liquid state]]> Gas + Liquid Slurry Example 12 <![CDATA[Method for storing CO2 with part in gas state and part in liquid state]]> Gas + Liquid Solid + slurry

[0144] like Figures 1 to 10 As shown:

[0145] Example 1

[0146] The short-long wall intermittent filling mining and alkaline solid waste CO2 storage system of this embodiment includes:

[0147] CO2 storage structure: It is constructed by short-long wall intermittent filling without coal pillar mining method, enclosing multiple closed CO2 storage spaces for storing alkali solid waste and CO2 transported by alkali solid waste and CO2 pipeline transportation system;

[0148] Alkali solid waste and CO2 pipeline transportation system: used to transport CO2 and alkali solid waste into the CO2 storage space, and discharge the gas in the CO2 storage space out of the CO2 storage space; including a CO2 transportation pipeline 1 and an alkali solid waste transportation pipeline 2 that pass through the CO2 storage structure from the outside and enter the CO2 storage space, and an exhaust pipeline 3 that passes from the CO2 storage space to the outside of the CO2 storage structure;

[0149] CO2 storage monitoring system: used to monitor the CO2 storage process.

[0150] In this embodiment, the CO2 storage structure includes a plurality of airtight filling bodies 5, a plurality of spacer filling bodies 6, a top plate 7, a bottom plate 8 and a sealing and anti-seepage treatment component. The plurality of airtight filling bodies 5 are arranged in multiple rows and intervals perpendicular to the main lane 10. The lane between two adjacent airtight filling bodies 5 is a filling reserved lane 11. The setting direction of the spacer filling body 6 is perpendicular to the setting direction of the airtight filling body 5. The plurality of spacer filling bodies 6 are arranged in multiple rows and intervals. Both ends of the spacer filling body 6 are on top of the short strip filling body 12. Each The CO2 storage space is surrounded by side walls, a top plate 7 and a bottom plate 8, and the side walls are composed of two adjacent spacer filling bodies 6, an airtight filling body 5 located on one side of the spacer filling body 6, an airtight filling body 5 located on the other side of the spacer filling body 6, and a sealed door 13 arranged on the airtight filling body 5; the sealing and anti-seepage treatment component includes a top sealing and anti-seepage treatment structure arranged at the bottom of the top plate 7, a side wall sealing and anti-seepage treatment structure arranged on the outside of the side wall, and a bottom sealing and anti-seepage treatment structure arranged at the top of the bottom plate 8.

[0151] In this embodiment, each airtight filling body 5 includes a plurality of short strip filling bodies 12 arranged at intervals, and a connecting tunnel 14 is provided between two adjacent short strip filling bodies 12. Each of the CO2 storage spaces is surrounded by side walls, a top plate 7 and a bottom plate 8. The side walls are composed of two adjacent spaced filling bodies 6, one or two short strip filling bodies 12 located on one side of the spaced filling body 6, one or two short strip filling bodies 12 located on the other side of the spaced filling body 6, and a sealing door 13 arranged on the short strip filling body 12 or in the connecting tunnel 14.

[0152] In this embodiment, a top net 15 is suspended on the top plate 7, and the top plate 7 and the top net 15 are reinforced by anchor rods 16. The top sealing and anti-seepage treatment structure includes a top shotcrete layer formed by slurry sprayed on the top plate 7 and the top net 15, and a top anti-seepage layer formed by anti-seepage material sprayed on the top shotcrete layer; the side wall sealing and anti-seepage treatment structure includes a side wall anti-seepage layer formed by anti-seepage material sprayed on the short strip filling body 12 and the spacer filling body 6; the bottom sealing and anti-seepage treatment structure includes a bottom shotcrete layer formed by slurry sprayed on the bottom plate 8, and a bottom anti-seepage layer formed by anti-seepage material sprayed on the bottom shotcrete layer.

[0153] During specific implementation, the spacing between the anchor rods 16 is no greater than 1500 mm, and the row spacing is no greater than 1500 mm.

[0154] In this embodiment, all the CO2 to be sealed is in gaseous state. The CO2 conveying pipeline 1 is used to convey the gaseous CO2 to be sealed, and the alkali solid waste conveying pipeline 2 is used to convey the alkali solid waste in slurry state; the CO2 conveying pipeline 1 is connected to the CO2 gas storage tank 17 arranged on the ground, and the CO2 conveying pipeline 1 is provided with a CO2 intake pump 18 and a CO2 intake control valve 19, the alkali solid waste conveying pipeline 2 is connected to the pulping station 24 arranged on the ground, and the alkali solid waste conveying pipeline 2 is provided with an alkali solid waste conveying pump 25 and an alkali solid waste conveying control valve 26; the exhaust pipeline 3 is provided with an exhaust control valve 23, and the CO2 storage monitoring system includes a controller 27 and a sensor group connected to the input end of the controller 27, and the sensor group includes a sensor group arranged on the CO2 conveying pipeline. 1, an intake pressure sensor 28, an intake flow sensor 29 and an intake temperature sensor 30, an exhaust CO2 concentration sensor 31, an exhaust pressure sensor 32 and an exhaust temperature sensor 33 arranged on the exhaust pipe 3, an alkali solid waste flow sensor 34 arranged on the alkali solid waste conveying pipeline 2, a PH sensor 52 and a metal ion concentration sensor 53 arranged in the bottom drainage ditch of the filling lane 11, and a lane CO2 concentration sensor 35, a lane CO concentration sensor 36, a lane CH4 concentration sensor 37 and a lane O2 concentration sensor 38 arranged in the filling lane 11; the CO2 intake pump 18, the CO2 intake control valve 19, the exhaust control valve 23, the alkali solid waste conveying pump 25 and the alkali solid waste conveying control valve 26 are all connected to the output end of the controller 27.

[0155] Example 2

[0156] The present embodiment is different from the embodiment 1 in that part of the CO2 to be sealed is gaseous and partly liquid, the CO2 delivery pipeline 1 is used to deliver the gaseous CO2 to be sealed, the alkali solid waste delivery pipeline 2 is used to deliver the alkali solid waste in slurry state and the liquid CO2 to be sealed; the alkali solid waste delivery pipeline 2 is connected to the alkali solid waste delivery pipeline 2, the liquid CO2 delivery pipeline 4 is connected to the liquid CO2 storage tank 20, and the liquid CO2 delivery pipeline 4 is provided with a liquid CO2 delivery control valve 21 and a liquid CO2 delivery pump 22; the CO2 delivery pipeline 1 is connected to a CO2 gas storage tank 17 arranged on the ground, and a CO2 air intake pump 18 and a CO2 air intake control valve 19 are arranged on the CO2 delivery pipeline 1; the alkali solid waste delivery pipeline 2 is connected to a pulping station 24 arranged on the ground, and an alkali solid waste delivery pump 25 and an alkali solid waste delivery control valve 26 are arranged on the alkali solid waste delivery pipeline 2; an exhaust control valve 23 is arranged on the exhaust pipeline 3, and the CO2 storage monitoring system includes a controller 27 and a sensor connected to the input end of the controller 27 The sensor group includes an intake pressure sensor 28, an intake flow sensor 29 and an intake temperature sensor 30 arranged on the CO2 delivery pipeline 1, an exhaust CO2 concentration sensor 31, an exhaust pressure sensor 32 and an exhaust temperature sensor 33 arranged on the exhaust pipeline 3, an alkali solid waste flow sensor 34 arranged on the alkali solid waste delivery pipeline 2, a liquid CO2 pressure sensor 39, a liquid CO2 temperature sensor 40 and a liquid CO2 flow sensor 41 arranged on the liquid CO2 delivery pipeline 4, and a filling lane 1. The PH sensor 52 and the metal ion concentration sensor 53 in the bottom drainage ditch, as well as the CO2 concentration sensor 35, the CO concentration sensor 36, the CH4 concentration sensor 37 and the O2 concentration sensor 38 in the tunnel are arranged in the filling tunnel 11; the CO2 intake pump 18, the CO2 intake control valve 19, the exhaust control valve 23, the alkali solid waste delivery pump 25, the alkali solid waste delivery control valve 26, the liquid CO2 delivery control valve 21 and the liquid CO2 delivery pump 22 are all connected to the output end of the controller 27.

[0157] The rest of the structure is the same as that of Example 1.

[0158] Example 3

[0159] The present embodiment is different from the embodiment 1 in that: the CO2 to be sealed is all in liquid state, the alkali solid waste conveying pipeline 2 is used to convey alkali solid waste in slurry state and liquid CO2 to be sealed; the alkali solid waste conveying pipeline 2 is connected to the alkali solid waste conveying pipeline 2, the liquid CO2 conveying pipeline 4 is connected to the liquid CO2 storage tank 20, and the liquid CO2 conveying pipeline 4 is provided with a liquid CO2 conveying control valve 21 and a liquid CO2 conveying pump 22; the alkali solid waste conveying pipeline 2 is connected to a pulping station 24 arranged on the ground, and the alkali solid waste conveying pipeline 2 is provided with an alkali solid waste conveying pump 25 and an alkali solid waste conveying control valve 26; the exhaust pipe 3 is provided with an exhaust control valve 23, and the CO2 storage monitoring system includes a controller 27 and a sensor group connected to the input end of the controller 27, and the sensor group includes a sensor group arranged in the exhaust pipe The exhaust CO2 concentration sensor 31, the exhaust pressure sensor 32 and the exhaust temperature sensor 33 on the lane 3, the alkali solid waste flow sensor 34 arranged on the alkali solid waste conveying pipeline 2, the liquid CO2 pressure sensor 39, the liquid CO2 temperature sensor 40 and the liquid CO2 flow sensor 41 arranged on the liquid CO2 conveying pipeline 4, the PH sensor 52 and the metal ion concentration sensor 53 arranged in the bottom drainage ditch of the filling lane 11, and the lane CO2 concentration sensor 35, the lane CO concentration sensor 36, the lane CH4 concentration sensor 37 and the lane O2 concentration sensor 38 arranged in the filling lane 11; the exhaust control valve 23, the alkali solid waste conveying pump 25, the alkali solid waste conveying control valve 26, the liquid CO2 conveying control valve 21 and the liquid CO2 conveying pump 22 are all connected to the output end of the controller 27.

[0160] The rest of the structure is the same as that of Example 1.

[0161] Example 4

[0162] This embodiment is a method for short-long wall discontinuous filling mining and alkali solid waste CO2 storage using the short-long wall discontinuous filling mining and alkali solid waste CO2 storage system in Example 1, and the method includes the following steps:

[0163] Step 1: Prepare the alkali solid waste to be disposed of and the CO2 to be sealed;

[0164] Step 2: Design a short-long wall intermittent filling coal pillar-free mining method;

[0165] Step 3: The mining area is mined by short-long wall intermittent filling without coal pillars, and a CO2 storage structure is constructed during the mining process, connecting the alkali solid waste and CO2 pipeline transportation system and the CO2 storage monitoring system;

[0166] Step 4: transport the alkaline solid waste to be disposed of and the CO2 to be sealed to the CO2 storage structure.

[0167] In this embodiment, when the alkali solid waste to be disposed and the CO2 to be sealed are prepared in step 1, the alkali solid waste includes slurry-type alkali solid waste and solid-type alkali solid waste, the gaseous CO2 to be sealed is stored in the CO2 gas storage tank 17, and the liquid CO2 is stored in the liquid CO2 liquid storage tank 20;

[0168] The short-long wall discontinuous filling coal pillar-free mining method in step 2 divides the mining area into a preparation working face 44 and a plurality of continuous short-long wall discontinuous filling coal pillar-free mining working faces, each of which includes a preparation working face 44 and a short wall mining working face 45 arranged in sequence;

[0169] The specific process of adopting the short-long wall intermittent filling non-pillar mining method to mine the mining area in step 3, constructing a CO2 storage structure during the mining process, and connecting the alkali solid waste and CO2 pipeline transportation system and the CO2 storage monitoring system is as follows:

[0170] Step 301, mining the prepared working surface 37;

[0171] Step 302, sequentially mine multiple short-long wall intermittent filling coal pillar-free mining working faces. When mining each short-long wall intermittent filling coal pillar-free mining working face, first mine the short wall mining working face 45 to form multiple short strip filling bodies 12; then mine the long wall mining working face 46 to form multiple interval filling bodies 6; when mining the long wall mining working face 46, every time a space is formed between two interval filling bodies 6, the roof 7 is reinforced, and a top sealing and anti-seepage treatment structure and a side wall sealing and anti-seepage treatment structure are set. and a bottom sealing and anti-seepage treatment structure, and a sealing door 13 is arranged on the short strip filling body 12 or in the connecting tunnel 14; two adjacent interval filling bodies 6, one or two short strip filling bodies 12 located on one side of the interval filling body 6, one or two short strip filling bodies 12 located on the other side of the interval filling body 6, and the sealing door 13 arranged on the short strip filling body 12 or in the connecting tunnel 14 constitute the side wall of the CO2 storage space, and the side wall of the CO2 storage space, the reinforced top plate 7 and the bottom plate 8 enclose a CO2 storage space;

[0172] During specific implementation, a top net 15 is suspended on the top plate 7, and the top plate 7 and the top net 15 are reinforced by anchor rods 16. The spacing of the anchor rods 16 is not more than 1500mm, and the row spacing is not more than 1500mm. When setting the top sealing and anti-seepage treatment structure, first spray slurry on the top plate 7 and the top net 15 to form a top shotcrete layer for plugging the cracks, pores, etc. existing after mining, and then spray anti-seepage material on the top shotcrete layer to form a top anti-seepage layer. When setting the side wall sealing and anti-seepage treatment structure, spray anti-seepage material on the short strip filling body 12 and the interval filling body 6 to form a side wall anti-seepage layer. When setting the bottom sealing and anti-seepage treatment structure, first spray slurry on the bottom plate 8 to form a bottom shotcrete layer, and then spray anti-seepage material on the bottom shotcrete layer to form a bottom anti-seepage layer.

[0173] Step 303, connecting the base solid waste and CO2 pipeline transportation system;

[0174] Step 304: Connect to the CO2 storage monitoring system.

[0175] In this embodiment, the preparation working face 44 is a five-strip short-wall mining working face;

[0176] The short-wall mining face 45 in the short-long wall intermittent filling coal-pillar-free mining face is a five-strip short-wall mining face; the specific method of mining a plurality of short-long wall intermittent filling coal-pillar-free mining faces in sequence and constructing a CO2 storage structure during the mining process in step 302 includes a method of mining the short-wall mining face 45 and the preparation face 44 in the short-long wall intermittent filling coal-pillar-free mining face;

[0177] The method for mining the short-wall mining face 45 in the short-long wall intermittent filling coal pillar-free mining face is the same as the method for mining the preparation face 37 in step 301, and both are:

[0178] Step A1, dividing the short-wall mining working face 45 into three excavation working faces 47 and two strip-type filling mining working faces 48 spaced between the three excavation working faces 47 in a direction perpendicular to the main tunnel 10;

[0179] Step A2: Use narrow strip filling mining method to mine the strip filling mining face 48; the specific method is:

[0180] Step A201, dividing the strip filling mining face 48 into m narrow strips, and dividing each narrow strip into n short strips 49 along a direction parallel to the main tunnel 10, and the gap between two adjacent short strips 49 is a connecting tunnel 14; wherein the values ​​of m and n are both non-zero natural numbers;

[0181] Step A202, mining m narrow strips; wherein the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main tunnel, and then using filling materials to fill n short strips 49 in sequence to form n short strip filling bodies 12;

[0182] Step A3, using a roadheader or a continuous mining machine to dig out three tunnels at the excavation working face 47 away from the main tunnel, the middle tunnel is used as the mining tunnel 50 or the filling tunnel 11, and the two tunnels on both sides are used as the mining tunnel 50;

[0183] The method for mining the preparation working face 44 in the short-long wall intermittent filling coal pillar-free mining working face is to mine the preparation working face 44 using a comprehensive mechanized coal mining process; when mining the preparation working face 44 using a comprehensive mechanized coal mining process, each time the maximum width L of the sealed space is reached, max Previously, filling materials were used to carry out strip filling in parallel to the direction of the main tunnel 10 to form a plurality of spaced filling bodies 6 until the longwall mining face 2 was mined.

[0184] The method for determining the maximum width of the sealed storage space is determined in the following two cases:

[0185] Assuming that the basic roof is a plate-type fracture, the method for determining the maximum width of the sealing space is: according to the formula Calculate the maximum width L of the storage space max ;

[0186] Among them, L max is the maximum width of the storage space, in meters; w is the total thickness of the rock layers that make up the basic top, in meters; h i is the thickness of the i-th rock layer from the basic top (including the basic top), in m, where i is a non-zero natural number; μ is the Poisson's ratio of the basic top; R T is the tensile strength of the basic top rock layer, in MPa; γ i The unit is MN / m 3 ; E i It is the elastic modulus of the i-th rock layer from the basic top (including the basic top), in MPa.

[0187] Assuming a basic top beam fracture, the maximum width of the sealed space is determined by: According to the formula Calculate the maximum width L of the storage space max ;

[0188] Among them, L max is the maximum width of the storage space, in meters; w is the total thickness of the rock layers that make up the basic top, in meters; h iis the thickness of the i-th rock layer from the basic top (including the basic top), in meters; μ is the Poisson's ratio of the basic top; R T is the tensile strength of the basic top rock layer, in MPa; γ i The unit is MN / m 3 ; E i It is the elastic modulus of the i-th rock layer from the basic top (including the basic top), in MPa.

[0189] In this embodiment, the specific process of the method for connecting the base solid waste and CO2 pipeline transportation system in step 303 is:

[0190] Step 303A1, inserting a CO2 delivery pipeline 1 extending into the CO2 storage space into the lower part of the short strip filling body 12 located at one side of the CO2 storage space, connecting a CO2 air intake pump 18 and a CO2 air intake control valve 19 to the CO2 delivery pipeline 1, and connecting the CO2 delivery pipeline 1 to a CO2 gas storage tank 17 disposed on the ground;

[0191] Step 303A2, inserting an exhaust pipe 3 and an alkali solid waste conveying pipe 2 extending into the CO2 storage space into the upper part of the short strip filling body 12 located on the other side of the CO2 storage space, and connecting an exhaust control valve 23 to the CO2 conveying pipe 1, connecting the alkali solid waste conveying pipe 2 to the pulping station 24 on the ground, and connecting an alkali solid waste conveying pump 25 and an alkali solid waste conveying control valve 26 to the alkali solid waste conveying pipe 2;

[0192] During specific implementation, when filling and forming a short strip filling body 12, reserved holes for the CO2 conveying pipeline, reserved holes for the exhaust pipeline and reserved holes for the alkali solid waste conveying pipeline are set; the CO2 conveying pipeline 1 is extended into the CO2 storage space by penetrating into the reserved hole for the CO2 conveying pipeline, and a cementitious material is poured in the gap to ensure air tightness; the exhaust pipeline 3 is extended into the CO2 storage space by penetrating into the reserved hole for the exhaust pipeline, and a cementitious material is poured in the gap to ensure air tightness; the alkali solid waste conveying pipeline 2 is extended into the CO2 storage space by penetrating into the reserved hole for the alkali solid waste conveying pipeline, and a cementitious material is poured in the gap.

[0193] In this embodiment, the specific process of the method for connecting the CO2 storage monitoring system in step 304 is as follows:

[0194] Step 304A1, connecting the intake air pressure sensor 28, the intake air flow sensor 29 and the intake air temperature sensor 30 to the CO2 delivery pipeline 1;

[0195] Step 304A 2. Connect the exhaust CO2 concentration sensor 31, the exhaust pressure sensor 32 and the exhaust temperature sensor 33 to the exhaust pipe 3;

[0196] Step 304A3, connecting the base solid waste flow sensor 34 to the base solid waste conveying pipeline 2;

[0197] Step 304A4, installing a CO2 concentration sensor 35, a CO concentration sensor 36, a CH4 concentration sensor 37 and an O2 concentration sensor 38 in the lane of the filling lane 11;

[0198] Step 304A5, a pH sensor 52 and a metal ion concentration sensor 53 are installed in the bottom drainage ditch of the filling tunnel 11;

[0199] In specific implementation, in the filling tunnel 11, a group of tunnel CO2 concentration sensors 35, tunnel CO concentration sensors 36, tunnel CH4 concentration sensors 37 and tunnel O2 concentration sensors 38 and a group of PH sensors 52 and metal ion concentration sensors 53 are arranged at intervals of 50m to 100m in the filling tunnel 11; they are used to monitor the concentrations of O2, CO, CO2, CH4 and the PH of groundwater, as well as the metal ion concentration in the filling tunnel 11, to prevent CO2 leakage and ensure the safety of personnel entering and exiting the filling tunnel 11;

[0200] Step 304A6, connect the output ends of the intake pressure sensor 28, the intake flow sensor 29, the intake temperature sensor 30, the exhaust CO2 concentration sensor 31, the exhaust pressure sensor 32, the exhaust temperature sensor 33, the alkali solid waste flow sensor 34, the pH sensor 52, the metal ion concentration sensor 53, the CO2 concentration sensor 35 in the lane, the CO concentration sensor 36 in the lane, the CH4 concentration sensor 37 in the lane, and the O2 concentration sensor 38 in the lane to the input end of the controller 27;

[0201] Step 304A7, connect the CO2 intake pump 18, the CO2 intake control valve 19, the exhaust control valve 23, the alkali solid waste delivery pump 25 and the alkali solid waste delivery control valve 26 to the output end of the controller 27;

[0202] In this embodiment, the method of transporting the alkali solid waste to be disposed and the CO2 to be sealed to the CO2 sealing structure described in step 4 includes a method of transporting the alkali solid waste to be disposed to the CO2 sealing structure and a method of transporting the CO2 to be sealed to the CO2 sealing structure, wherein the method of transporting the alkali solid waste to be disposed to the CO2 sealing structure is a method when the alkali solid waste to be disposed needs to be stored in the CO2 sealing structure in a solid state, opening the sealing door 13, and directly storing the alkali solid waste in the CO2 sealing structure;

[0203] The method of transporting the CO2 to be stored into the CO2 storage structure is a method of transporting the gaseous CO2 to be stored into the CO2 storage structure in a gaseous form, and the specific process is as follows:

[0204] Start the CO2 intake button 43, the controller 27 controls the CO2 intake pump 18 and the CO2 intake control valve 19 to open, and controls the exhaust control valve 23 to open, and the CO2 gas in the CO2 storage tank 17 enters the CO2 storage space through the CO2 delivery pipeline 1; during the intake process, the intake pressure sensor 28 detects the intake pressure in real time, the intake flow sensor 29 detects the intake flow in real time, the intake temperature sensor 30 detects the intake temperature in real time, the exhaust CO2 concentration sensor 31 detects the CO2 concentration in the exhaust pipeline 3 in real time, the exhaust pressure sensor 32 detects the pressure in the exhaust pipeline 3 in real time, and the exhaust temperature sensor 33 detects the exhaust temperature in real time; when the CO2 concentration in the exhaust pipeline 3 exceeds the preset CO2 concentration value, the controller 27 controls the exhaust control valve 23 to close and stop exhaust; when the pressure in the exhaust pipeline 3 reaches the preset upper limit pressure value, the controller 27 controls the CO2 intake pump 18 and the CO2 intake control valve 19 to close and stop intake;

[0205] The solid alkaline solid waste or slurry alkaline solid waste, the short strip filling body 12, the interval filling body 6 and the gaseous CO2 or liquid CO2 entering the CO2 storage structure undergo mineralization reactions, such as reaction formulas (F1), (F2), (F3), (F4), and (F5):

[0206] CaO+H2O→Ca(OH)2 (F1)

[0207] MgO+H2O→Mg(OH)2 (F2)

[0208] Mg(OH)2+CO2→MgCO3+H2O (F3)

[0209] Ca(OH)2+CO2→CaCO3+H2O (F4)

[0210] 2CaO·SiO2+2H2O→CaO·SiO2·H2O+Ca(OH)2 (F5)

[0211] CaO·SiO2·H2O+CO2→CaCO3+SiO2·H2O(F6)

[0212] In the initial stage of the reaction, the solid alkali solid waste or alkali solid waste in slurry state, the short strip filling body 12, the interval filling body 6, and the β-C2S and the oxides such as Ca and Mg produced by hydration react with CO2 to form CSH and CaCO3 and MgCO3 to fill the pores of the alkali solid waste, quickly enhance the filling body strength, and accelerate the filling body curing; as the reaction proceeds, CSH reacts with CO2 to generate amorphous silica gel SiO2·H20, as shown in reaction formula (F6) Amorphous SiO2 acts as a cementitious material for the filling body, and CaCO3 acts as a recycled aggregate for the filling body, which improves the density and strength of the filling body, and effectively improves the mechanical properties and durability of the filling body; on the one hand, the rapid mineralization reaction shortens the curing period of the filling body, and the interval filling body 6 and the short strip filling body 12 can quickly support the top plate to ensure the stability of the CO2 storage structure. On the other hand, CO2 is permanently sealed in the form of inorganic carbonate in the alkaline solid waste, the short strip filling body 12 and the interval filling body 6;

[0213] The reaction causes the pressure in the CO2 storage structure to decrease. When the pressure in the exhaust pipe 3 decreases to a preset lower pressure limit, the controller 27 controls the CO2 intake pump 18 and the CO2 intake control valve 19 to open and continue intake.

[0214] Example 5

[0215] This embodiment is a method for short-long wall discontinuous filling mining and alkali solid waste CO2 storage using the short-long wall discontinuous filling mining and alkali solid waste CO2 storage system in Example 1. The difference from Example 4 is that the method for transporting the alkali solid waste to be disposed into the CO2 storage structure is a method when the alkali solid waste to be disposed needs to be stored in the CO2 storage structure in a slurry state. The slurry feed button 42 is started, and the controller 27 controls the alkali solid waste delivery pump 25 and the alkali solid waste delivery control valve 26. The alkali solid waste in a slurry state treated by the pulping station 24 enters the CO2 storage space through the alkali solid waste delivery pipeline 2;

[0216] The remaining methods are the same as those in Example 4.

[0217] Example 6

[0218] This embodiment is a method for short-long wall discontinuous filling mining and alkali solid waste CO2 sealing using the short-long wall discontinuous filling mining and alkali solid waste CO2 sealing system in Example 1. The difference from Example 4 is that: the method for transporting the alkali solid waste to be disposed into the CO2 sealing structure is a method when the alkali solid waste to be disposed needs to be stored in the CO2 sealing structure in part in a solid state and in part in a slurry state. First, open the sealing door 13, store the alkali solid waste in a solid state into the CO2 sealing structure, and then start the slurry feed button 42. The controller 27 controls the alkali solid waste conveying pump 25 and the alkali solid waste conveying control valve 26 to open, and the alkali solid waste in a slurry state treated by the pulping station 24 enters the CO2 storage space through the alkali solid waste conveying pipeline 2;

[0219] The remaining methods are the same as those in Example 4.

[0220] Example 7

[0221] This embodiment is a method for short-long wall discontinuous filling mining and alkali solid waste CO2 storage using the short-long wall discontinuous filling mining and alkali solid waste CO2 storage system in Example 2. The difference from Example 4 is that in this embodiment, the specific process of the method of connecting the alkali solid waste and CO2 pipeline transportation system in step 303 is:

[0222] Step 303B1, inserting a CO2 delivery pipeline 1 extending into the CO2 storage space into the lower part of the short strip filling body 12 located at one side of the CO2 storage space, connecting a CO2 air intake pump 18 and a CO2 air intake control valve 19 to the CO2 delivery pipeline 1, and connecting the CO2 delivery pipeline 1 to a CO2 gas storage tank 17 disposed on the ground;

[0223] Step 303B2, connect the liquid CO2 delivery pump 22 and the liquid CO2 delivery control valve 21 to the liquid CO2 delivery pipeline 4, and connect the liquid CO2 delivery pipeline 4 to the liquid CO2 storage tank;

[0224] Step 303B3, inserting an exhaust pipe 3 and an alkali solid waste conveying pipe 2 extending into the CO2 storage space into the upper part of the short strip filling body 12 located on the other side of the CO2 storage space, and connecting an exhaust control valve 23 to the CO2 exhaust pipe 3, connecting the alkali solid waste conveying pipe 2 to the pulping station 24 on the ground, and connecting an alkali solid waste conveying pump 25 and an alkali solid waste conveying control valve 26 to the alkali solid waste conveying pipe 2;

[0225] During specific implementation, when filling and forming a short strip filling body 12, reserved holes for the CO2 conveying pipeline, reserved holes for the exhaust pipeline and reserved holes for the alkali solid waste conveying pipeline are set; the CO2 conveying pipeline 1 is extended into the CO2 storage space by penetrating into the reserved hole for the CO2 conveying pipeline, and a cementitious material is poured in the gap to ensure air tightness; the exhaust pipeline 3 is extended into the CO2 storage space by penetrating into the reserved hole for the exhaust pipeline, and a cementitious material is poured in the gap to ensure air tightness; the alkali solid waste conveying pipeline 2 is extended into the CO2 storage space by penetrating into the reserved hole for the alkali solid waste conveying pipeline, and a cementitious material is poured in the gap.

[0226] In this embodiment, the specific process of the method for connecting the CO2 storage monitoring system in step 304 is as follows:

[0227] Step 304B1, connecting the intake air pressure sensor 28, the intake air flow sensor 29 and the intake air temperature sensor 30 to the CO2 delivery pipeline 1;

[0228] Step 304B2, connecting the liquid CO2 pressure sensor 39, the liquid CO2 temperature sensor 40 and the liquid CO2 flow sensor 41 to the liquid CO2 delivery pipeline 4;

[0229] Step 304B3, connecting the exhaust CO2 concentration sensor 31, the exhaust pressure sensor 32 and the exhaust temperature sensor 33 to the exhaust pipe 3;

[0230] Step 304B4, connecting the base solid waste flow sensor 34 to the base solid waste conveying pipeline 2;

[0231] Step 304B5, a CO2 concentration sensor 35, a CO concentration sensor 36, a CH4 concentration sensor 37 and an O2 concentration sensor 38 are arranged in the tunnel of the filling tunnel 11;

[0232] Step 304B6, a pH sensor 52 and a metal ion concentration sensor 53 are installed in the bottom drainage ditch of the filling tunnel 11;

[0233] In specific implementation, in the filling tunnel 11, a group of tunnel CO2 concentration sensors 35, tunnel CO concentration sensors 36, tunnel CH4 concentration sensors 37 and tunnel O2 concentration sensors 38 and a group of PH sensors 52 and metal ion concentration sensors 53 are arranged at intervals of 50m to 100m in the filling tunnel 11; they are used to monitor the concentrations of O2, CO, CO2, CH4 and the PH of groundwater, as well as the metal ion concentration in the filling tunnel 11, to prevent CO2 leakage and ensure the safety of personnel entering and exiting the filling tunnel 11;

[0234] Step 304B7, connect the output ends of the intake pressure sensor 28, the intake flow sensor 29, the intake temperature sensor 30, the exhaust CO2 concentration sensor 31, the exhaust pressure sensor 32, the exhaust temperature sensor 33, the alkali solid waste flow sensor 34, the liquid CO2 pressure sensor 39, the liquid CO2 temperature sensor 40 and the liquid CO2 flow sensor 41, the pH sensor 52, the metal ion concentration sensor 53, the in-lane CO2 concentration sensor 35, the in-lane CO concentration sensor 36, the in-lane CH4 concentration sensor 37 and the in-lane O2 concentration sensor 38 to the input end of the controller 27;

[0235] Step 304B8, connect the CO2 intake pump 18, the CO2 intake control valve 19, the exhaust control valve 23, the liquid CO2 delivery pump 22, the liquid CO2 delivery control valve 21, the alkali solid waste delivery pump 25 and the alkali solid waste delivery control valve 26 to the output end of the controller 27;

[0236] In this embodiment, the method of transporting the CO2 to be sealed into the CO2 storage structure in step four not only includes a method of transporting the gaseous CO2 to be sealed into the CO2 storage structure in gaseous form, but also includes a method of transporting the liquid CO2 to be sealed into the CO2 storage structure in liquid form, wherein the method of transporting the liquid CO2 to be sealed into the CO2 storage structure in liquid form is: start the CO2 liquid inlet button 51, the controller 27 controls the liquid CO2 delivery pump 22, the liquid CO2 delivery control valve 21 and the alkali solid waste delivery control valve 26 to open, and controls the exhaust control valve 23 to open, and the CO2 liquid in the CO2 storage tank 17 enters the CO2 storage space through the liquid CO2 delivery pipeline and the alkali solid waste delivery pipeline 1; during the liquid inlet process, the exhaust CO2 concentration sensor 31 performs real-time detection of the CO2 concentration in the exhaust pipeline 3, and the exhaust pressure sensor 32 performs real-time detection of the exhaust The pressure in the pipeline 3 is detected in real time, the exhaust temperature sensor 33 detects the exhaust temperature in real time, the liquid CO2 pressure sensor 39 detects the liquid CO2 pressure in real time, the liquid CO2 temperature sensor 40 detects the liquid CO2 temperature in real time, and the liquid CO2 flow sensor 41 detects the liquid CO2 flow in real time; when the CO2 concentration in the exhaust pipeline 3 exceeds the preset CO2 concentration value, the controller 27 controls the exhaust control valve 23 to close and stop exhausting; when the liquid CO2 flow reaches the upper limit pressure value, the controller 27 controls the liquid CO2 delivery pump 22, the liquid CO2 delivery control valve 21 and the alkali solid waste delivery control valve 26 to close and stop the introduction of liquid CO2; when the pressure in the exhaust pipeline 3 reaches the preset upper limit pressure value, the controller 27 controls the liquid CO2 delivery pump 22, the liquid CO2 delivery control valve 21 and the alkali solid waste delivery control valve 26 to close and stop the introduction of liquid CO2;

[0237] The reaction causes the pressure in the CO2 storage structure to decrease. When the pressure in the exhaust pipe 3 drops to a preset lower pressure limit, the controller 27 controls the CO2 intake pump 18, the CO2 intake control valve 19, the liquid CO2 delivery pump 22, the liquid CO2 delivery control valve 21 and the alkali solid waste delivery control valve 26 to open and continue to intake air.

[0238] The remaining methods are the same as those in Example 4.

[0239] Example 8

[0240] This embodiment is a method for short-long wall discontinuous filling mining and alkali solid waste CO2 storage using the short-long wall discontinuous filling mining and alkali solid waste CO2 storage system in Example 2. The difference from Example 7 is that the method for transporting the alkali solid waste to be disposed into the CO2 storage structure is a method when the alkali solid waste to be disposed needs to be stored in the CO2 storage structure in a slurry state. The slurry feed button 42 is started, and the controller 27 controls the alkali solid waste delivery pump 25 and the alkali solid waste delivery control valve 26. The alkali solid waste in a slurry state treated by the pulping station 24 enters the CO2 storage space through the alkali solid waste delivery pipeline 2;

[0241] The remaining methods are the same as in Example 7.

[0242] Example 9

[0243] This embodiment is a method for short-long wall discontinuous filling mining and alkali solid waste CO2 storage using the short-long wall discontinuous filling mining and alkali solid waste CO2 storage system in Example 2. The difference from Example 7 is that the method for transporting the alkali solid waste to be disposed of to the CO2 storage structure is a method when the alkali solid waste to be disposed of needs to be stored in the CO2 storage structure in part in a solid state and in part in a slurry state. First, open the sealing door 13, store the solid alkali waste in the CO2 storage structure, and then start the slurry feed button 42. The controller 27 controls the alkali solid waste delivery pump 25 and the alkali solid waste delivery control valve 26 to open, and the alkali solid waste in the slurry state treated by the pulping station 24 enters the CO2 storage space through the alkali solid waste delivery pipeline 2;

[0244] The remaining methods are the same as in Example 7.

[0245] Example 10

[0246] This embodiment is a method for short-long wall discontinuous filling mining and alkali solid waste CO2 storage using the short-long wall discontinuous filling mining and alkali solid waste CO2 storage system in Example 3. The difference from Example 4 is that in this embodiment, the specific process of the method for connecting the alkali solid waste and CO2 pipeline transportation system in step 303 is as follows:

[0247] Step 303C1, connecting the liquid CO2 delivery pump 22 and the liquid CO2 delivery control valve 21 to the liquid CO2 delivery pipeline 4, and connecting the liquid CO2 delivery pipeline 4 to the liquid CO2 storage tank;

[0248] Step 303C2, inserting an exhaust pipe 3 and an alkali solid waste conveying pipe 2 extending into the CO2 storage space into the upper part of the short strip filling body 12 located on the other side of the CO2 storage space, and connecting an exhaust control valve 23 to the CO2 exhaust pipe 3, connecting the alkali solid waste conveying pipe 2 to the pulping station 24 on the ground, and connecting an alkali solid waste conveying pump 25 and an alkali solid waste conveying control valve 26 to the alkali solid waste conveying pipe 2;

[0249] During specific implementation, when filling and forming a short strip filling body 12, reserved holes for exhaust pipes and reserved holes for alkali solid waste conveying pipes are set, and the exhaust pipe 3 is extended into the CO2 storage space by penetrating into the reserved hole for exhaust pipe, and cementitious material is poured in the gap to ensure air tightness; the alkali solid waste conveying pipe 2 is extended into the CO2 storage space by penetrating into the reserved hole for alkali solid waste conveying pipe, and cementitious material is poured in the gap.

[0250] In this embodiment, the specific process of the method for connecting the CO2 storage monitoring system in step 304 is as follows:

[0251] Step 304C1, connecting the liquid CO2 pressure sensor 39, the liquid CO2 temperature sensor 40 and the liquid CO2 flow sensor 41 to the liquid CO2 delivery pipeline 4;

[0252] Step 304C2, connecting the exhaust CO2 concentration sensor 31, the exhaust pressure sensor 32 and the exhaust temperature sensor 33 to the exhaust pipe 3;

[0253] Step 304C3, connecting the base solid waste flow sensor 34 to the base solid waste conveying pipeline 2;

[0254] Step 304C4, installing a CO2 concentration sensor 35, a CO concentration sensor 36, a CH4 concentration sensor 37 and an O2 concentration sensor 38 in the lane of the filling lane 11;

[0255] Step 304C5: Install a pH sensor 52 and a metal ion concentration sensor 53 in the bottom drainage ditch of the filling tunnel 11.

[0256] In specific implementation, in the filling tunnel 11, a group of tunnel CO2 concentration sensors 35, tunnel CO concentration sensors 36, tunnel CH4 concentration sensors 37 and tunnel O2 concentration sensors 38 and a group of PH sensors 52 and metal ion concentration sensors 53 are arranged at intervals of 50m to 100m in the filling tunnel 11; they are used to monitor the concentrations of O2, CO, CO2, CH4 and the PH of groundwater, as well as the metal ion concentration in the filling tunnel 11, to prevent CO2 leakage and ensure the safety of personnel entering and exiting the filling tunnel 11;

[0257] Step 304C6, connect the output ends of the exhaust CO2 concentration sensor 31, the exhaust pressure sensor 32, the exhaust temperature sensor 33, the alkali solid waste flow sensor 34, the liquid CO2 pressure sensor 39, the liquid CO2 temperature sensor 40 and the liquid CO2 flow sensor 41, the pH sensor 52, the metal ion concentration sensor 53, the in-lane CO2 concentration sensor 35, the in-lane CO concentration sensor 36, the in-lane CH4 concentration sensor 37 and the in-lane O2 concentration sensor 38 to the input end of the controller 27;

[0258] Step 304C7, connect the exhaust control valve 23, the liquid CO2 delivery pump 22, the liquid CO2 delivery control valve 21, the alkali solid waste delivery pump 25 and the alkali solid waste delivery control valve 26 to the output end of the controller 27.

[0259] In this embodiment, the method of transporting the CO2 to be stored to the CO2 storage structure in step 4 is a method of transporting the liquid CO2 to be stored to the CO2 storage structure in liquid form, and the specific process is as follows:

[0260] Start the CO2 liquid inlet button 51, the controller 27 controls the liquid CO2 delivery pump 22, the liquid CO2 delivery control valve 21 and the alkali solid waste delivery control valve 26 to open, and controls the exhaust control valve 23 to open, and the CO2 liquid in the CO2 storage tank 17 enters the CO2 storage space through the liquid CO2 delivery pipeline and the alkali solid waste delivery pipeline 1; during the liquid inlet process, the exhaust CO2 concentration sensor 31 performs real-time detection of the CO2 concentration in the exhaust pipeline 3, the exhaust pressure sensor 32 performs real-time detection of the pressure in the exhaust pipeline 3, the exhaust temperature sensor 33 performs real-time detection of the exhaust temperature, the liquid CO2 pressure sensor 39 performs real-time detection of the liquid CO2 pressure, and the liquid CO2 temperature sensor 34 performs real-time detection of the exhaust temperature. The device 40 detects the temperature of the liquid CO2 in real time, and the liquid CO2 flow sensor 41 detects the flow of the liquid CO2 in real time; when the CO2 concentration in the exhaust pipe 3 exceeds the preset CO2 concentration value, the controller 27 controls the exhaust control valve 23 to close and stop exhausting; when the liquid CO2 flow reaches the upper limit pressure value, the controller 27 controls the liquid CO2 delivery pump 22, the liquid CO2 delivery control valve 21 and the alkali solid waste delivery control valve 26 to close and stop the introduction of liquid CO2; when the pressure in the exhaust pipe 3 reaches the preset upper limit pressure value, the controller 27 controls the liquid CO2 delivery pump 22, the liquid CO2 delivery control valve 21 and the alkali solid waste delivery control valve 26 to close and stop the introduction of liquid CO2;

[0261] The reaction causes the pressure in the CO2 storage structure to decrease. When the pressure in the exhaust pipe 3 drops to a preset lower pressure limit, the controller 27 controls the liquid CO2 delivery pump 22, the liquid CO2 delivery control valve 21 and the alkali solid waste delivery control valve 26 to open and continue to intake air.

[0262] The remaining methods are the same as those in Example 4.

[0263] Embodiment 11

[0264] This embodiment is a method for short-long wall discontinuous filling mining and alkali solid waste CO2 storage using the short-long wall discontinuous filling mining and alkali solid waste CO2 storage system in Example 3. The difference from Example 10 is that the method for transporting the alkali solid waste to be disposed into the CO2 storage structure is a method when the alkali solid waste to be disposed needs to be stored in the CO2 storage structure in a slurry state. The slurry feed button 42 is started, and the controller 27 controls the alkali solid waste delivery pump 25 and the alkali solid waste delivery control valve 26. The alkali solid waste in a slurry state treated by the pulping station 24 enters the CO2 storage space through the alkali solid waste delivery pipeline 2;

[0265] The rest of the methods are the same as in Example 10.

[0266] Example 12

[0267] This embodiment is a method for short-long wall discontinuous filling mining and alkali solid waste CO2 storage using the short-long wall discontinuous filling mining and alkali solid waste CO2 storage system in Example 3. The difference from Example 10 is that the method for transporting the alkali solid waste to be disposed into the CO2 storage structure is a method when the alkali solid waste to be disposed needs to be stored in the CO2 storage structure in part in a solid state and in part in a slurry state. First, open the sealing door 13, store the solid alkali waste in the CO2 storage structure, and then start the slurry feed button 42. The controller 27 controls the alkali solid waste delivery pump 25 and the alkali solid waste delivery control valve 26 to open, and the alkali solid waste in the slurry state treated by the pulping station 24 enters the CO2 storage space through the alkali solid waste delivery pipeline 2;

[0268] The rest of the methods are the same as in Example 10.

[0269] In summary, the present invention provides a system and method for CO2 storage in coordination with short- and long-wall intermittent filling mining and alkaline solid waste. Strip filling is adopted in the short-wall working face, and interval filling is adopted in the long-wall working face. The space formed by the short- and long-wall mining working faces is used as the CO2 storage space. Alkaline solid wastes such as modified magnesium slag and fly ash are used as filling materials, and alkaline solid wastes and CO2 are stored in the storage space. CO2 undergoes mineralization reaction in the storage space and is permanently sealed in the alkaline solid waste and the filling body in the form of inorganic carbonates. At the same time, part of the CO2 is sealed in the space, forming a storage mode with chemical sealing as the main and physical sealing as the auxiliary.

[0270] Its theoretical and practical significance lies in: (1) It proposes the use of storage space constructed by short- and long-wall intermittent filling mining to store CO2, enriches the types of CO2 storage, and provides new ideas for the exploration of CO2 storage storage facilities; (2) It forms a synergistic and green model of efficient recovery of coal resources - large-scale disposal of solid waste - reuse of goaf - CO2 storage; (3) It helps achieve the dual carbon goals, can safely and effectively store CO2, reduce CO2 emissions, and alleviate the impact of the greenhouse effect caused by carbon emissions on humans.

[0271] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A short-long wall intermittent filling mining and alkaline solid waste CO2 storage system, characterized by: include: The CO2 storage structure is constructed by using a short-long wall intermittent filling and pillarless mining method to enclose multiple closed CO2 storage spaces for storing alkali solid waste and CO2 transported therein by the alkali solid waste and CO2 pipeline transportation system. The CO2 storage structure includes multiple airtight filling bodies (5), multiple spacer filling bodies (6), a top plate (7), a bottom plate (8) and a sealing and anti-seepage treatment component. The multiple airtight filling bodies (5) are arranged in multiple rows and at intervals perpendicular to the main lane (10). The lane between two adjacent airtight filling bodies (5) is a filling reserved lane (11). The setting direction of the spacer filling body (6) is perpendicular to the setting direction of the airtight filling body (5). The multiple spacer filling bodies (6) The spacers (6) are arranged in multiple rows at intervals, and both ends of the spacer filling bodies (6) are placed on the short strip filling bodies (12); each of the CO2 storage spaces is surrounded by side walls, a top plate (7) and a bottom plate (8), and the side walls are composed of two adjacent spacer filling bodies (6), an airtight filling body (5) located on one side of the spacer filling body (6), an airtight filling body (5) located on the other side of the spacer filling body (6), and a sealing door (13) arranged on the airtight filling body (5); the sealing and anti-seepage treatment component includes a top sealing and anti-seepage treatment structure arranged at the bottom of the top plate (7), a side wall sealing and anti-seepage treatment structure arranged on the side wall, and a bottom sealing and anti-seepage treatment structure arranged at the top of the bottom plate (8); Each airtight filling body (5) comprises a plurality of short strip filling bodies (12) arranged at intervals, and a connecting tunnel (14) is provided between two adjacent short strip filling bodies (12). Each of the CO2 storage spaces is surrounded by side walls, a top plate (7) and a bottom plate (8), and the side walls are composed of two adjacent spaced filling bodies (6), one or two short strip filling bodies (12) located on one side of the spaced filling body (6), one or two short strip filling bodies (12) located on the other side of the spaced filling body (6), and a sealing door (13) provided on the short strip filling body (12) or in the connecting tunnel (14); A top net (15) is suspended on the top plate (7), and the top plate (7) and the top net (15) are reinforced by anchor rods (16). The top sealing and anti-seepage treatment structure comprises a top shotcrete layer formed by slurry sprayed on the top plate (7) and the top net (15), and a top anti-seepage layer formed by an anti-seepage material sprayed on the top shotcrete layer; the side wall sealing and anti-seepage treatment structure comprises a side wall anti-seepage layer formed by an anti-seepage material sprayed on the short strip filling body (12) and the spacer filling body (6); the bottom sealing and anti-seepage treatment structure comprises a bottom shotcrete layer formed by slurry sprayed on the bottom plate (8), and a bottom anti-seepage layer formed by an anti-seepage material sprayed on the bottom shotcrete layer; Alkali solid waste and CO2 pipeline transportation system: used to transport CO2 and alkali solid waste into the CO2 storage space, and to discharge the gas in the CO2 storage space out of the CO2 storage space; comprising a CO2 transportation pipeline (1) and an alkali solid waste transportation pipeline (2) that pass through the CO2 storage structure from the outside and enter the CO2 storage space, and an exhaust pipeline (3) that passes from the CO2 storage space out of the CO2 storage structure; CO2 storage monitoring system: used to monitor the CO2 storage process.

2. The short-long wall intermittent filling mining and alkaline solid waste CO2 storage system according to claim 1 is characterized by: When all the CO2 to be sealed is in gaseous state, the CO2 delivery pipeline (1) is used to deliver the gaseous CO2 to be sealed, and the alkali solid waste delivery pipeline (2) is used to deliver the alkali solid waste in slurry state; the CO2 delivery pipeline (1) is connected to a CO2 gas storage tank (17) arranged on the ground, and a CO2 intake pump (18) and a CO2 intake control valve (19) are arranged on the CO2 delivery pipeline (1); the alkali solid waste delivery pipeline (2) is connected to a pulping station (24) arranged on the ground, and a alkali solid waste delivery pump (25) and an alkali solid waste delivery control valve (26) are arranged on the alkali solid waste delivery pipeline (2); the exhaust pipeline (3) is provided with an exhaust control valve (23); the CO2 storage monitoring system comprises a controller (27) and a sensor group connected to the input end of the controller (27), and the sensor group comprises an intake pressure sensor arranged on the CO2 delivery pipeline (1); A sensor (28), an intake air flow sensor (29) and an intake air temperature sensor (30), an exhaust CO2 concentration sensor (31), an exhaust pressure sensor (32) and an exhaust temperature sensor (33) arranged on the exhaust pipe (3), an alkali solid waste flow sensor (34) arranged on the alkali solid waste conveying pipe (2), a pH sensor (52) and a metal ion concentration sensor (53) arranged in the bottom drainage ditch of the filling lane (11), and an in-lane CO2 concentration sensor (35), an in-lane CO concentration sensor (36), an in-lane CH4 concentration sensor (37) and an in-lane O2 concentration sensor (38) arranged in the filling lane (11); the CO2 intake pump (18), the CO2 intake control valve (19), the exhaust control valve (23), the alkali solid waste conveying pump (25) and the alkali solid waste conveying control valve (26) are all connected to the output end of the controller (27); When the CO2 to be sealed is partially in gaseous state and partially in liquid state, the CO2 delivery pipeline (1) is used to deliver the gaseous CO2 to be sealed, and the alkali solid waste delivery pipeline (2) is used to deliver the alkali solid waste in slurry state and the liquid CO2 to be sealed; the alkali solid waste delivery pipeline (2) is connected to a liquid CO2 delivery pipeline (4), the liquid CO2 delivery pipeline (4) is connected to a liquid CO2 storage tank (20), and the liquid CO2 delivery pipeline (4) is provided with a liquid CO2 delivery control valve (21) and a liquid CO2 delivery pump (22); the CO2 delivery pipeline (1) is connected to a liquid CO2 storage tank (20); The alkali solid waste delivery pipeline (2) is connected to a CO2 gas storage tank (17) on the ground, a CO2 air intake pump (18) and a CO2 air intake control valve (19) are arranged on the CO2 delivery pipeline (1), the alkali solid waste delivery pipeline (2) is connected to a pulping station (24) arranged on the ground, the alkali solid waste delivery pipeline (2) is provided with an alkali solid waste delivery pump (25) and an alkali solid waste delivery control valve (26); the exhaust pipeline (3) is provided with an exhaust control valve (23), the CO2 storage monitoring system comprises a controller (27) and a sensor group connected to the input end of the controller (27), the sensor group comprises a sensor group arranged at the C An intake pressure sensor (28), an intake flow sensor (29) and an intake temperature sensor (30) on the O2 delivery pipeline (1); an exhaust CO2 concentration sensor (31), an exhaust pressure sensor (32) and an exhaust temperature sensor (33) arranged on the exhaust pipeline (3); an alkali solid waste flow sensor (34) arranged on the alkali solid waste delivery pipeline (2); a liquid CO2 pressure sensor (39), a liquid CO2 temperature sensor (40) and a liquid CO2 flow sensor (41) arranged on the liquid CO2 delivery pipeline (4); and a drainage ditch at the bottom of the filling lane (11). A pH sensor (52) and a metal ion concentration sensor (53), as well as a CO2 concentration sensor (35) in the tunnel, a CO concentration sensor (36) in the tunnel, a CH4 concentration sensor (37) in the tunnel, and an O2 concentration sensor (38) in the tunnel are arranged in the filling and retention tunnel (11); the CO2 intake pump (18), the CO2 intake control valve (19), the exhaust control valve (23), the alkali solid waste delivery pump (25), the alkali solid waste delivery control valve (26), the liquid CO2 delivery control valve (21), and the liquid CO2 delivery pump (22) are all connected to the output end of the controller (27); When all the CO2 to be sealed is in liquid form, the alkali solid waste conveying pipeline (2) is used to convey alkali solid waste in a slurry state and liquid CO2 to be sealed; the alkali solid waste conveying pipeline (2) is connected to the alkali solid waste conveying pipeline (2), the liquid CO2 conveying pipeline (4) is connected to the liquid CO2 storage tank (20), and the liquid CO2 conveying pipeline (4) is provided with a liquid CO2 conveying control valve (21) and a liquid CO2 conveying pump (22); The alkali solid waste conveying pipeline (2) is connected to a pulping station (24) arranged on the ground, and the alkali solid waste conveying pipeline (2) is provided with an alkali solid waste conveying pump (25) and an alkali solid waste conveying control valve (26); the exhaust pipe (3) is provided with an exhaust control valve (23), and the CO2 storage monitoring system includes a controller (27) and a sensor group connected to the input end of the controller (27), and the sensor group includes an exhaust CO2 concentration sensor arranged on the exhaust pipe (3). A sensor (31), an exhaust pressure sensor (32) and an exhaust temperature sensor (33), an alkali solid waste flow sensor (34) arranged on the alkali solid waste conveying pipeline (2), a liquid CO2 pressure sensor (39), a liquid CO2 temperature sensor (40) and a liquid CO2 flow sensor (41) arranged on the liquid CO2 conveying pipeline (4), a pH sensor (52) and a metal ion concentration sensor (53) arranged in the bottom drainage ditch of the filling lane (11), and a lane CO2 concentration sensor (35), a lane CO concentration sensor (36), a lane CH4 concentration sensor (37) and a lane O2 concentration sensor (38) arranged in the filling lane (11); the exhaust control valve (23), the alkali solid waste conveying pump (25), the alkali solid waste conveying control valve (26), the liquid CO2 conveying control valve (21) and the liquid CO2 conveying pump (22) are all connected to the output end of the controller (27).

3. A method for short-long wall discontinuous filling mining and alkali solid waste CO2 storage using the short-long wall discontinuous filling mining and alkali solid waste CO2 storage system as claimed in claim 1, characterized in that: The method comprises the following steps: Step 1: Prepare the alkali solid waste to be disposed of and the CO2 to be sealed; Step 2: Design a short-long wall intermittent filling coal pillar-free mining method; Step 3: The mining area is mined by short-long wall intermittent filling without coal pillars, and a CO2 storage structure is constructed during the mining process, connecting the alkali solid waste and CO2 pipeline transportation system and the CO2 storage monitoring system; Step 4: Transport the alkaline solid waste to be disposed of and the CO2 to be stored to the CO2 storage structure.

4. The method according to claim 3, characterized in that: When the alkali solid waste to be disposed and the CO2 to be sealed are prepared in step 1, the alkali solid waste includes slurry-type alkali solid waste and solid-type alkali solid waste, the gaseous CO2 to be sealed is stored in the CO2 gas storage tank (17), and the liquid CO2 is stored in the liquid CO2 liquid storage tank (20); The short-long wall discontinuous filling coal pillar-free mining method in step 2 divides the mining area into a preparation working face (44) and a plurality of continuous short-long wall discontinuous filling coal pillar-free mining working faces, each of which includes a preparation working face (44) and a short wall mining working face (45) arranged in sequence; The specific process of adopting the short-long wall intermittent filling non-pillar mining method to mine the mining area in step 3, constructing a CO2 storage structure during the mining process, and connecting the alkali solid waste and CO2 pipeline transportation system and the CO2 storage monitoring system is as follows: Step 301, mining the prepared working surface (44); Step 302, sequentially mine multiple short-long wall intermittent filling coal pillar-free mining faces. When mining each short-long wall intermittent filling coal pillar-free mining face, first mine the short wall mining face (45) to form multiple short strip filling bodies (12); then mine the long wall mining face (46) to form multiple interval filling bodies (6); when mining the long wall mining face (46), every time a space is formed between two interval filling bodies (6), the roof (7) is reinforced, and a top sealing and anti-seepage treatment structure, a side wall sealing and anti-seepage treatment structure and a bottom sealing and anti-seepage treatment structure are set. A seepage treatment structure is provided, and a sealing door (13) is arranged on the short strip filling body (12) or in the connecting tunnel (14); two adjacent interval filling bodies (6), one or two short strip filling bodies (12) located on one side of the interval filling body (6), one or two short strip filling bodies (12) located on the other side of the interval filling body (6), and the sealing door (13) arranged on the short strip filling body (12) or in the connecting tunnel (14) constitute the side wall of the CO2 storage space, and the side wall of the CO2 storage space, the reinforced top plate (7) and the bottom plate (8) enclose a CO2 storage space; Step 303, connecting the base solid waste and CO2 pipeline transportation system; Step 304: Connect to the CO2 storage monitoring system.

5. The method according to claim 4, characterized in that: The preparation working face (44) is a five-strip short-wall mining working face; The short-wall mining working face (45) in the short-long wall discontinuous filling coal-pillar-free mining working face is a five-line short-wall mining working face; the specific method of sequentially mining multiple short-long wall discontinuous filling coal-pillar-free mining working faces and constructing a CO2 storage structure during the mining process described in step 302 includes a method of mining the short-wall mining working face (45) and the preparation working face (44) in the short-long wall discontinuous filling coal-pillar-free mining working face; The method for mining the short-wall mining face (45) in the short-long wall intermittent filling coal pillar-free mining face is the same as the method for mining the preparation face (44) in step 301, and both are: Step A1, dividing the short-wall mining working face (45) into three excavation working faces (47) and two strip-type filling mining working faces (48) spaced between the three excavation working faces (47) in a direction perpendicular to the main tunnel (10); Step A2: using a narrow strip filling mining method to mine the strip filling mining working face (48); the specific method is: Step A201, dividing the strip filling mining working face (48) into m narrow strips, and dividing each narrow strip into n short strips (49) along a direction parallel to the main tunnel (10), and the gap between two adjacent short strips (49) is a connecting tunnel (14); wherein the values ​​of m and n are both non-zero natural numbers; Step A202, mining m narrow strips; wherein the method for mining each narrow strip is: using a roadheader or a continuous miner to dig through the narrow strip away from the main tunnel, and then using filling materials to fill n short strips (49) in sequence to form n short strip filling bodies (12); Step A3, using a roadheader or a continuous mining machine to dig three tunnels away from the main tunnel at the excavation working face (47), with the middle tunnel serving as a recovery tunnel (50) or a filling tunnel (11), and the two tunnels on both sides serving as recovery tunnels (50); The method for mining the preparation working face (44) in the short-long wall intermittent filling coal pillar-free mining working face is to mine the preparation working face (44) using a comprehensive mechanized coal mining process; when mining the preparation working face (44) using a comprehensive mechanized coal mining process, each time the maximum width L of the sealed space is reached, max Previously, the filling material was used to carry out strip filling parallel to the direction of the main tunnel (10) to form a plurality of spaced filling bodies (6) until the longwall mining working face (46) was mined; When the basic top is assumed to be a plate fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ; When the basic top is assumed to be a beam fracture, according to the formula Calculate the maximum gap width L of the filling side wall max ; Among them, L max The unit is m; w is the total thickness of the rock layers that make up the basic top, in m; h i is the thickness of the i-th rock layer above the basic top, in m, i is a natural number from 1 to n, n is the total number of rock layers above the basic top; h1 is the thickness of the basic top, in m; μ is the Poisson's ratio of the basic top; R T is the tensile strength of the basic top rock layer of the coal seam, in MPa; γi is the bulk density of the i-th rock layer above the basic top, in MN / m 3 ; E i is the elastic modulus of the i-th rock layer from the basic top, in MPa; E1 is the elastic modulus of the basic top, in MPa.

6. The method according to claim 4, characterized in that: The method of connecting the base solid waste and CO2 pipeline transportation system in step 303 includes the following three cases: Case 1: When all the CO2 to be stored is in gaseous state, the specific process is as follows: Step 303A1, inserting a CO2 delivery pipeline (1) extending into the CO2 storage space into the lower part of the short strip filling body (12) located on one side of the CO2 storage space, connecting a CO2 air intake pump (18) and a CO2 air intake control valve (19) to the CO2 delivery pipeline (1), and connecting the CO2 delivery pipeline (1) to a CO2 gas storage tank (17) disposed on the ground; Step 303A2, inserting an exhaust pipe (3) and an alkali solid waste conveying pipe (2) extending into the CO2 storage space into the upper part of the short strip filling body (12) located on the other side of the CO2 storage space, and connecting an exhaust control valve (23) to the CO2 conveying pipe (1), connecting the alkali solid waste conveying pipe (2) to a pulping station (24) on the ground, and connecting an alkali solid waste conveying pump (25) and an alkali solid waste conveying control valve (26) to the alkali solid waste conveying pipe (2); Case 2: When the CO2 to be stored is partly gaseous and partly liquid, the specific process is as follows: Step 303B1, inserting a CO2 delivery pipeline (1) extending into the CO2 storage space into the lower part of the short strip filling body (12) located on one side of the CO2 storage space, connecting a CO2 air intake pump (18) and a CO2 air intake control valve (19) to the CO2 delivery pipeline (1), and connecting the CO2 delivery pipeline (1) to a CO2 gas storage tank (17) disposed on the ground; Step 303B2, connect the liquid CO2 delivery pipeline (4) to the liquid CO2 delivery pump (22) and the liquid CO2 delivery control valve (21), and connect the liquid CO2 delivery pipeline (4) to the liquid CO2 storage tank; Step 303B3, inserting an exhaust pipe (3) and an alkali solid waste conveying pipe (2) extending into the CO2 storage space into the upper part of the short strip filling body (12) located on the other side of the CO2 storage space, and connecting an exhaust control valve (23) to the CO2 exhaust pipe (3), connecting the alkali solid waste conveying pipe (2) to the pulping station (24) on the ground, and connecting an alkali solid waste conveying pump (25) and an alkali solid waste conveying control valve (26) to the alkali solid waste conveying pipe (2); Case 3: When all the CO2 to be stored is in liquid form, the specific process is as follows: Step 303C1, connect the liquid CO2 delivery pump (22) and the liquid CO2 delivery control valve (21) to the liquid CO2 delivery pipeline (4), and connect the liquid CO2 delivery pipeline (4) to the liquid CO2 storage tank; Step 303C2, inserting an exhaust pipe (3) and an alkali solid waste conveying pipe (2) extending into the CO2 storage space into the upper part of the short strip filling body (12) located on the other side of the CO2 storage space, and connecting an exhaust control valve (23) to the CO2 exhaust pipe (3), connecting the alkali solid waste conveying pipe (2) to the pulping station (24) on the ground, and connecting an alkali solid waste conveying pump (25) and an alkali solid waste conveying control valve (26) to the alkali solid waste conveying pipe (2); The method of connecting to the CO2 storage monitoring system in step 304 includes the following three cases: Case 1: When all the CO2 to be stored is in gaseous state, the specific process is as follows: Step 304A1, connecting an intake pressure sensor (28), an intake flow sensor (29) and an intake temperature sensor (30) to the CO2 delivery pipeline (1); Step 304A2, connecting the exhaust CO2 concentration sensor (31), the exhaust pressure sensor (32) and the exhaust temperature sensor (33) to the exhaust pipe (3); Step 304A3, connecting the base solid waste flow sensor (34) to the base solid waste conveying pipeline (2); Step 304A4, installing a CO2 concentration sensor (35), a CO concentration sensor (36), a CH4 concentration sensor (37) and an O2 concentration sensor (38) in the lane of the filling lane (11); Step 304A5, a pH sensor (52) and a metal ion concentration sensor (53) are arranged in the bottom drainage ditch of the filling tunnel (11); Step 304A6, connecting the output ends of the intake pressure sensor (28), the intake flow sensor (29), the intake temperature sensor (30), the exhaust CO2 concentration sensor (31), the exhaust pressure sensor (32), the exhaust temperature sensor (33), the alkali solid waste flow sensor (34), the pH sensor (52), the metal ion concentration sensor (53), the CO2 concentration sensor in the lane (35), the CO concentration sensor in the lane (36), the CH4 concentration sensor in the lane (37) and the O2 concentration sensor in the lane (38) to the input end of the controller (27); Step 304A7, connect the CO2 intake pump (18), the CO2 intake control valve (19), the exhaust control valve (23), the alkali solid waste delivery pump (25) and the alkali solid waste delivery control valve (26) to the output end of the controller (27); Case 2: When the CO2 to be stored is partly gaseous and partly liquid, the specific process is as follows: The specific process of connecting to the CO2 storage monitoring system in step 304 is as follows: Step 304B1, connecting an intake pressure sensor (28), an intake flow sensor (29) and an intake temperature sensor (30) to the CO2 delivery pipeline (1); Step 304B2, connecting the liquid CO2 pressure sensor (39), the liquid CO2 temperature sensor (40) and the liquid CO2 flow sensor (41) to the liquid CO2 delivery pipeline (4); Step 304B3, connecting the exhaust CO2 concentration sensor (31), the exhaust pressure sensor (32) and the exhaust temperature sensor (33) to the exhaust pipe (3); Step 304B4, connecting the base solid waste flow sensor (34) to the base solid waste conveying pipeline (2); Step 304B5, installing a CO2 concentration sensor (35), a CO concentration sensor (36), a CH4 concentration sensor (37) and an O2 concentration sensor (38) in the lane of the filling lane (11); Step 304B6, a pH sensor (52) and a metal ion concentration sensor (53) are arranged in the bottom drainage ditch of the filling tunnel (11); Step 304B7, connecting the output ends of the intake pressure sensor (28), the intake flow sensor (29), the intake temperature sensor (30), the exhaust CO2 concentration sensor (31), the exhaust pressure sensor (32), the exhaust temperature sensor (33), the alkali solid waste flow sensor (34), the liquid CO2 pressure sensor (39), the liquid CO2 temperature sensor (40) and the liquid CO2 flow sensor (41), the pH sensor (52), the metal ion concentration sensor (53), the in-lane CO2 concentration sensor (35), the in-lane CO concentration sensor (36), the in-lane CH4 concentration sensor (37) and the in-lane O2 concentration sensor (38) to the input end of the controller (27); Step 304B8, connect the CO2 air intake pump (18), the CO2 air intake control valve (19), the exhaust control valve (23), the liquid CO2 delivery pump (22), the liquid CO2 delivery control valve (21), the alkali solid waste delivery pump (25) and the alkali solid waste delivery control valve (26) to the output end of the controller (27); Case 3: When all the CO2 to be stored is in liquid form, the specific process is as follows: Step 304C1, connecting a liquid CO2 pressure sensor (39), a liquid CO2 temperature sensor (40) and a liquid CO2 flow sensor (41) to the liquid CO2 delivery pipeline (4); Step 304C2, connecting the exhaust CO2 concentration sensor (31), the exhaust pressure sensor (32) and the exhaust temperature sensor (33) to the exhaust pipe (3); Step 304C3, connecting the base solid waste flow sensor (34) to the base solid waste conveying pipeline (2); Step 304C4, installing a CO2 concentration sensor (35), a CO concentration sensor (36), a CH4 concentration sensor (37) and an O2 concentration sensor (38) in the lane of the filling lane (11); Step 304C5: a pH sensor (52) and a metal ion concentration sensor (53) are installed in the bottom drainage ditch of the filling tunnel (11). Step 304C6, connecting the output ends of the exhaust CO2 concentration sensor (31), the exhaust pressure sensor (32), the exhaust temperature sensor (33), the alkali solid waste flow sensor (34), the liquid CO2 pressure sensor (39), the liquid CO2 temperature sensor (40) and the liquid CO2 flow sensor (41), the pH sensor (52), the metal ion concentration sensor (53), the in-lane CO2 concentration sensor (35), the in-lane CO concentration sensor (36), the in-lane CH4 concentration sensor (37) and the in-lane O2 concentration sensor (38) to the input end of the controller (27); Step 304C7, connect the exhaust control valve (23), the liquid CO2 delivery pump (22), the liquid CO2 delivery control valve (21), the alkali solid waste delivery pump (25) and the alkali solid waste delivery control valve (26) to the output end of the controller (27).

7. The method according to claim 6, characterized in that: The method of transporting the alkali solid waste to be disposed and the CO2 to be sealed to the CO2 sealing structure in step 4 includes a method of transporting the alkali solid waste to be disposed to the CO2 sealing structure and a method of transporting the CO2 to be sealed to the CO2 sealing structure, wherein the method of transporting the alkali solid waste to be disposed to the CO2 sealing structure includes the following three cases: Case I: When the alkali solid waste to be disposed needs to be stored in the CO2 storage structure in a solid state, the sealing door (13) is opened to directly store the alkali solid waste in the CO2 storage structure; Case II: When the alkali solid waste to be disposed needs to be stored in the CO2 storage structure in a slurry state, the slurry feed button (42) is activated, and the controller (27) controls the alkali solid waste delivery pump (25) and the alkali solid waste delivery control valve (26), and the alkali solid waste in a slurry state treated by the pulping station (24) enters the CO2 storage space through the alkali solid waste delivery pipeline (2); Case III: When the alkali solid waste to be disposed needs to be stored partially in a solid state in the CO2 storage structure and partially in a slurry state in the CO2 storage structure, the sealing door (13) is first opened to store the alkali solid waste in a solid state in the CO2 storage structure, and then the slurry feed button (42) is activated, and the controller (27) controls the alkali solid waste delivery pump (25) and the alkali solid waste delivery control valve (26) to open, and the alkali solid waste in a slurry state after being processed by the pulping station (24) enters the CO2 storage space through the alkali solid waste delivery pipeline (2); Among them, the method of transporting the CO2 to be stored into the CO2 storage structure includes the following three cases: Case 1: When all the CO2 to be stored is in gaseous form, the gaseous CO2 to be stored is transported to the CO2 storage structure in gaseous form; Case 2: When part of the CO2 to be stored is gaseous and part is liquid, the gaseous CO2 to be stored is transported to the CO2 storage structure in gaseous form, and the liquid CO2 to be stored is transported to the CO2 storage structure in liquid form, and the two states of CO2 are transported simultaneously or one after the other; Case 3: When all the CO2 to be stored is in liquid form, the liquid CO2 to be stored is transported to the CO2 storage structure in liquid form; The method for delivering the gaseous CO2 to be sealed in the CO2 sealing structure in the form of gas is as follows: the CO2 intake button (43) is activated, the controller (27) controls the CO2 intake pump (18) and the CO2 intake control valve (19) to open, and controls the exhaust control valve (23) to open, and the CO2 gas in the CO2 storage tank (17) enters the CO2 sealing space through the CO2 delivery pipeline (1); during the intake process, the intake pressure sensor (28) detects the intake pressure in real time, the intake flow sensor (29) detects the intake flow in real time, and the intake temperature sensor (30) detects the intake temperature. Real-time detection, the exhaust CO2 concentration sensor (31) detects the CO2 concentration in the exhaust pipe (3) in real time, the exhaust pressure sensor (32) detects the pressure in the exhaust pipe (3) in real time, and the exhaust temperature sensor (33) detects the exhaust temperature in real time; when the CO2 concentration in the exhaust pipe (3) exceeds a preset CO2 concentration value, the controller (27) controls the exhaust control valve (23) to close and stop exhaust; when the pressure in the exhaust pipe (3) reaches a preset upper pressure limit, the controller (27) controls the CO2 intake pump (18) and the CO2 intake control valve (19) to close and stop intake; The method for delivering the liquid CO2 to be sealed in the CO2 sealing structure in liquid form is as follows: the CO2 liquid inlet button (51) is activated, the controller (27) controls the liquid CO2 delivery pump (22), the liquid CO2 delivery control valve (21) and the alkali solid waste delivery control valve (26) to open, and controls the exhaust control valve (23) to open, and the CO2 liquid in the CO2 storage tank (20) enters the CO2 sealing space through the liquid CO2 delivery pipeline and the alkali solid waste delivery pipeline (2); during the liquid inlet process, the exhaust CO2 concentration sensor (31) detects the CO2 concentration in the exhaust pipeline (3) in real time, the exhaust pressure sensor (32) detects the pressure in the exhaust pipeline (3) in real time, the exhaust temperature sensor (33) detects the exhaust temperature in real time, and the liquid CO2 pressure sensor (39) detects the liquid CO2 The pressure is detected in real time, the liquid CO2 temperature sensor (40) detects the liquid CO2 temperature in real time, and the liquid CO2 flow sensor (41) detects the liquid CO2 flow in real time; when the CO2 concentration in the exhaust pipe (3) exceeds the preset CO2 concentration value, the controller (27) controls the exhaust control valve (23) to close and stop exhaust; when the liquid CO2 flow reaches the upper limit pressure value, the controller (27) controls the liquid CO2 delivery pump (22), the liquid CO2 delivery control valve (21) and the alkali solid waste delivery control valve (26) to close and stop the introduction of liquid CO2; when the pressure in the exhaust pipe (3) reaches the preset upper limit pressure value, the controller (27) controls the liquid CO2 delivery pump (22), the liquid CO2 delivery control valve (21) and the alkali solid waste delivery control valve (26) to close and stop the introduction of liquid CO2; The solid alkaline solid waste or slurry alkaline solid waste, the short strip filling body (12), the spacer filling body (6) and the gaseous CO2 or liquid CO2 entering the CO2 storage structure undergo mineralization reactions with each other, reaction formulas (F1), (F2), (F3), (F4), (F5), (F6): CaO+H2O→Ca(OH)2(F1) MgO+H2O→Mg(OH)2(F2) Mg(OH)2+CO2→MgCO3+H2O(F3) Ca(OH)2+CO2→CaCO3+H2O(F4) 2CaO·SiO2+2H2O→CaO·SiO2·H2O+Ca(OH)2(F5) CaO·SiO2·H2O+CO2→CaCO3+SiO2·H2O(F6) In the initial stage of the reaction, the solid alkali solid waste or alkali solid waste in a slurry state, the short strip filling body (12), and the interval filling body (6) react with β-C2S and Ca and Mg oxides produced by hydration to form CSH and CaCO3 and MgCO3 to fill the pores of the alkali solid waste, quickly enhance the strength of the filling body, and accelerate the curing of the filling body; as the reaction proceeds, CSH reacts with CO2 to generate amorphous silica gel SiO2·H20, as shown in reaction formula (F6); The shaped SiO2 acts as the cementitious material of the filling body, and the CaCO3 acts as the recycled aggregate of the filling body, thereby improving the density and strength of the filling body, and effectively improving the mechanical properties and durability of the filling body; on the one hand, the rapid mineralization reaction shortens the curing period of the filling body, and the interval filling body (6) and the short strip filling body (12) can quickly support the top plate to ensure the stability of the CO2 storage structure; on the other hand, the CO2 is permanently sealed in the form of inorganic carbonate in the alkaline solid waste, the short strip filling body (12) and the interval filling body (6); The reaction causes the pressure in the CO2 storage structure to decrease. When the pressure in the exhaust pipe (3) decreases to a preset lower pressure value, the controller (27) controls the CO2 intake pump (18) and the CO2 intake control valve (19) to open, or the controller (27) controls the CO2 intake pump (18), the CO2 intake control valve (19), the liquid CO2 delivery pump (22), the liquid CO2 delivery control valve (21) and the alkali solid waste delivery control valve (26) to open, or the controller (27) controls the liquid CO2 delivery pump (22), the liquid CO2 delivery control valve (21) and the alkali solid waste delivery control valve (26) to open, and the intake continues.

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