Integrated method and system for carbon dioxide sequestration, gob filling and reservoir construction

Abstract

The present invention relates to the engineering field of the combination of coal-based solid waste and carbon dioxide resource utilization and the construction of mined-out area storage reservoirs. Specifically, it relates to an integrated method and system for carbon dioxide sequestration, mined-out area filling, and storage reservoir construction. The method includes: collecting carbon dioxide from coal-based solid waste and flue gas emissions, performing carbonization treatment to obtain carbonized materials; using the carbonized materials as filling materials to fill a plurality of filling bodies at preset positions in the underground mined-out area, stabilizing the mined-out area through the filling bodies and forming a plurality of storage reservoir units. It can achieve carbon dioxide capture and sequestration, reduce carbon emissions, while being able to address the problems of occupying land resources and polluting the environment by open-pit coal-based solid waste, and can stabilize the space of the underground mined-out area, form a storage reservoir, and realize the functions of storing materials and energy.

Description

Technical Field

[0001] The present invention relates to the engineering field of the combination of coal-based solid waste and carbon dioxide resource utilization and the construction of mined-out area storage reservoirs, and particularly relates to an integrated method and system for carbon dioxide sequestration, mined-out area filling and storage reservoir construction. Background Art

[0002] During the coal mining process, large-scale abandoned mined-out areas cause geological disasters, seriously endangering the safety of mines. Hundreds of millions of cubic meters of mined-out areas are formed every year, which easily leads to the migration of groundwater and gas, surface subsidence and collapse, and then triggers geological disasters such as mine tremors, groundwater and surface water loss. Therefore, reasonable filling and utilization of the mined-out area space is a key problem that the coal industry urgently needs to solve. Summary of the Invention

[0003] The purpose of the present invention is to provide an integrated method and system for carbon dioxide sequestration, mined-out area filling and storage reservoir construction, which can realize carbon dioxide capture and sequestration, reduce carbon emissions, and at the same time can solve the problems of occupying land resources and polluting the environment of open-pit coal-based solid waste, and can stabilize the underground mined-out area space, form a storage reservoir, and realize the functions of storing materials and energy.

[0004] It can realize carbon dioxide capture and sequestration, reduce carbon emissions, and at the same time can solve the problems of occupying land resources and polluting the environment of open-pit coal-based solid waste, and can stabilize the underground mined-out area space. It can not only avoid geological disaster problems such as groundwater and gas migration, surface settlement and collapse, mine tremors, and groundwater loss, but also can effectively utilize the mined-out area, form diverse storage reservoirs, and realize the functions of storing materials and energy.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present invention is as follows:

[0006] In the first aspect, the present invention provides an integrated method for carbon dioxide sequestration, mined-out area filling and storage reservoir construction, which includes:

[0007] Collect carbon dioxide from coal-based solid waste and flue gas emissions, and perform carbonization treatment to obtain carbonized materials;

[0008] Use the carbonized materials as filling materials, and fill them at preset positions in the underground mined-out area to form several filling bodies, and stabilize the mined-out area through the filling bodies and form several storage reservoir units.

[0009] Further, determine the compressive strength of the carbonized materials according to the degree of carbonization of the carbonized materials. Specifically:

[0010] , where is the compressive strength of the filling body, R c is the degree of carbonization of the carbonized materials,a is the proportionality coefficient, b is the ultimate carbonation degree constant;

[0011] Determine the ultimate span between adjacent filling bodies and the ultimate width of a single filling body according to the compressive strength of the carbonized material. Specifically:

[0012] The ultimate span between adjacent filling bodies , where H is the thickness of the overlying strata, in m; is the ultimate tensile strength of the overlying strata, in MPa; F is the load stress of the overlying strata above the filling body and the storage, in MPa;

[0013] The ultimate width of a single filling body , where l is the length of the roof of the goaf, in m; is the filling plastic zone, is the compressive strength of the filling body, in MPa; is the safety factor;

[0014] , where is the average unit weight of the overlying strata, in MN / m 3 ; S is the distance from the goaf to the ground surface, in m;

[0015] , where M is the height of the filling body, in m; A is the pressure measurement coefficient; d is the mining disturbance coefficient; K is the maximum stress concentration coefficient on the filling body; is the coal seam dip angle; is the cohesion between the filling body and the roof of the goaf, is the internal friction angle between the filling body and the roof of the goaf.

[0016] Furthermore, the calculation formula for the carbonation degree of the carbonized material is:

[0017] ; where R c is the carbonation degree of the carbonized material; t is the carbonation reaction time, in s; is the carbonation rate coefficient; is the humidity effect, is the carbon dioxide concentration effect, is the carbonation degree effect, is the temperature effect.

[0018] Furthermore, is the humidity effect,

[0019] ,

[0020] , where h is the humidity, t is the carbonation reaction time, x is the migration distance, is the apparent permeability of liquid water, is the porosity of coal-based solid waste, is the dynamic viscosity of liquid water, is the water pressure, is the intrinsic diffusion coefficient, is the attenuation coefficient, is the water vapor density, is the influencing factor of humidity;

[0021] is the carbon dioxide concentration effect, , is the carbon dioxide gas density; is the carbonation reaction time t when the pressure of carbon dioxide participating in the carbonation reaction, is the maximum pressure of carbon dioxide participating in the carbonation reaction;

[0022] is the carbonation degree effect, , R is the carbonation reaction time t when the calcium carbonate content in the carbonized material, R max is the maximum calcium carbonate content in the carbonized material during the carbonation reaction;

[0023] is the temperature effect, , T is the carbonation reaction temperature, A is the pre-exponential factor, E 0 is the activation energy during the mineralization process;

[0024] , where is the equivalent heat capacity, B is the effective thermal conductivity, is the specific heat capacity of gaseous carbon dioxide, is the carbon dioxide gas density, is the feeding rate of carbon dioxide, is the specific heat capacity of liquid carbon dioxide, is the density of liquid carbon dioxide, is the inflow rate of pure water, is a dimensionless parameter;

[0025] , where is the initial pore diameter of the coal-based solid waste, is the attenuation coefficient, x is the migration distance, is the dynamic viscosity coefficient of carbon dioxide, P is the carbon dioxide pressure, R c is the degree of carbonization, is a dimensionless parameter.

[0026] Furthermore, forming several filling bodies by filling at preset positions in the goaf specifically includes the following steps:

[0027] S1. Plan the shortwall working face and the longwall working face along the main haulage roadway;

[0028] S2. Plan the roadway and several airtight filling strips arranged at intervals along the mining strike in the shortwall working face;

[0029] S3. Mine the planned airtight filling strips, and use carbonized materials as filling materials to form several first filling bodies at intervals in the area of the airtight filling strips. An openable and closable airtight closing door is connected between adjacent first filling bodies;

[0030] S4. Mine the planned roadway;

[0031] S5. Drive the longwall working face, and use carbonized materials as filling materials to form several second filling bodies at intervals in the driving direction of the longwall working face. Several groups of third filling bodies corresponding in position are formed at intervals on the opposite sidewalls of adjacent second filling bodies. The goaf is stabilized by the second filling bodies and the third filling bodies, and a storage unit is formed by enclosing the second filling bodies, the third filling bodies, and the roof and floor of the goaf.

[0032] Furthermore, an openable and closable sealed hatch is connected between single groups of third filling bodies.

[0033] Furthermore, when driving the main haulage roadway or the roadway, leave a coal pillar on the sidewall of the main haulage roadway or the roadway away from the goaf, and construct a load-bearing body near the reserved coal pillar.

[0034] Furthermore, use high-temperature steam to carbonize the coal-based solid waste and carbon dioxide in the flue gas emissions.

[0035] Furthermore, the coal-based solid waste includes fly ash and coal gangue; and / or, the flue gas emissions are one or more of the waste hot gas from a coal-fired power plant, the waste hot gas from a steel plant, and the waste hot gas from a chemical plant.

[0036] Second aspect, the present invention provides an integrated system for carbon dioxide sequestration, gob filling and reservoir construction, which includes:

[0037] A collection unit for collecting carbon dioxide from coal-based solid waste and flue gas emissions;

[0038] A carbonization treatment unit for carbonizing coal-based solid waste and carbon dioxide to obtain carbonized materials;

[0039] A transportation unit for transporting the carbonized materials to the underground gob;

[0040] A filling unit, using the carbonized materials as filling materials, filling at preset positions in the underground gob to form several filling bodies, and stabilizing the gob through the filling bodies and forming several reservoir units.

[0041] Advantages of the present invention:

[0042] 1. The present invention uses the carbonized materials obtained by carbonizing coal-based solid waste and carbon dioxide in flue gas emissions as gob filling materials to fill the underground gob, which can not only effectively stabilize the gob, but also permanently and safely sequester carbon dioxide, greatly reducing carbon emissions and reducing the adverse impact of the greenhouse effect on the environment. At the same time, it can also solve the problems of occupying land resources and polluting the environment by open-pit coal-based solid waste.

[0043] 2. The present invention realizes the filling stability of the gob space by reasonably arranging the filling bodies, which can avoid geological disaster problems such as groundwater and gas migration, surface subsidence, collapse, mine tremors, and groundwater loss. It can also effectively utilize the gob to form diverse reservoirs and realize the functions of storing materials and energy. Description of the Drawings

[0044] Figure 1 Shows the flow chart of the integrated method for carbon dioxide sequestration, gob filling and reservoir construction in the embodiments of the present invention.

[0045] Figure 2 Shows the overall structural schematic diagram of gob space filling and diverse reservoir construction in the embodiments of the present invention.

[0046] Figure 3 Shows the layout schematic diagram of shortwall and longwall working faces in the embodiments of the present invention.

[0047] Figure 4 Shows the tunneling schematic diagram of the shortwall working face in the embodiments of the present invention.

[0048] Figure 5 Shows the tunneling schematic diagram of the longwall working face in the embodiments of the present invention.

[0049] Figure 6 It shows a layout schematic diagram of the third filling body in an embodiment of the present invention.

[0050] Figure 7 It shows a schematic diagram of the composition structure of the integrated system for carbon dioxide sequestration, goaf filling and reservoir construction in an embodiment of the present invention.

[0051] In the figure, 1 - main haulage roadway, 2 - shortwall working face, 3 - longwall working face, 4 - reserved coal pillar, 5 - load-bearing body, 6 - roadway, 7 - first filling body, 8 - second filling body, 9 - third filling body, 10 - airtight closing door, 11 - sealed cabin door, 12 - reservoir unit, 13 - goaf, 14 - overlying strata, 15 - roof, 16 - floor, 17 - target coal seam, 18 - filling plate.

[0052] 100 - acquisition unit, 101 - carbon dioxide emission source, 102 - coal-based solid waste storage station, 103 - material transport vehicle;

[0053] 200 - carbonization treatment unit, 201 - carbonization treatment chamber, 202 - carbonized material storage chamber;

[0054] 300 - conveying unit;

[0055] 400 - filling unit;

[0056] 500 - discharging unit, 501 - vertical shaft, 502 - transfer station. Detailed implementation manners

[0057] The following will describe the implementation manners of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for explaining the present invention, rather than for limiting the protection scope of the present invention.

[0058] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape and size of the components in actual implementation. The type, quantity and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0059] In one embodiment, as shown in Figure 1 a method for integrating carbon dioxide sequestration, goaf filling and reservoir construction is provided, which includes the following steps:

[0060] Step 1: Collect carbon dioxide from coal-based solid waste and flue gas emissions.

[0061] Step 2: Conduct carbonization treatment to obtain carbonized materials.

[0062] Step 3: Use the carbonized materials as filling materials and fill them at preset positions in the underground goaf to form several filling bodies, which stabilize the goaf through the filling bodies and form several storage unit.

[0063] This application uses the carbonized materials obtained by carbonizing coal-based solid waste and carbon dioxide in flue gas emissions as the filling materials for the goaf, and fills the underground goaf. The strength of the carbonized materials obtained by carbonization treatment can reach dozens of MPa, which can effectively stabilize the goaf. And because carbon dioxide is sealed in the carbonized materials after carbonization treatment, by filling the underground goaf, it can also permanently and safely seal carbon dioxide, greatly reducing carbon emissions and reducing the adverse impact of the greenhouse effect on the environment. At the same time, it can also solve the problems of occupying land resources and polluting the environment of open-pit coal-based solid waste.

[0064] By reasonably arranging the filling bodies, the filling stability of the goaf space can be achieved, which can avoid geological disaster problems such as groundwater and gas migration, surface subsidence, collapse, mine tremors, and groundwater loss. It can also effectively utilize the goaf to form diverse storage, realizing the functions of storing materials and energy.

[0065] In a preferred embodiment, as shown in Figure 1 forming several filling bodies at preset positions in the goaf specifically includes the following steps:

[0066] S1: Plan shortwall working faces and longwall working faces along the main haulage roadway.

[0067] S2: Plan roadways and several airtight filling strips arranged at intervals along the mining strike in the shortwall working face.

[0068] S3: Mine the planned airtight filling strips, use the carbonized materials as filling materials, and form several first filling bodies at intervals in the area of the airtight filling strips. An openable and closable airtight closing door is connected between adjacent first filling bodies.

[0069] S4: Mine the planned roadways.

[0070] S5: Drive the longwall working face, use the carbonized materials as filling materials, and form several second filling bodies at intervals in the driving direction of the longwall working face. Several groups of third filling bodies corresponding in position are formed at intervals on the opposite sidewalls of adjacent second filling bodies. The goaf is stabilized through the second filling bodies and the third filling bodies, and storage units are formed by enclosing the second filling bodies, the third filling bodies, and the roof and floor of the goaf.

[0071] The following will be described in conjunction with specific steps:

[0072] S1. Plan shortwall working faces and longwall working faces along the main haulage roadway.

[0073] See Figure 1 and Figure 3 As shown, a cutting roadway is opened at one side of the bottom of the target coal seam 17 to be mined, and the main haulage roadway 1 is formed by tunneling. A reserved coal pillar 4 with a preset thickness is reserved on the wall surface of the main haulage roadway 1.

[0074] See Figure 3 As shown, a shortwall working face 2 and a longwall working face 3 are planned at the position of the main haulage roadway 1.

[0075] See Figure 3 As shown, a load-bearing body 5 is constructed at a position adjacent to the reserved coal pillar 4. The load-bearing body 5 is made of a concrete formed by mixing carbonized materials and cement. The load-bearing body 5 is used to support the surrounding space of the main haulage roadway 1 and the overlying unmined coal seam and rock stratum, and to stabilize the main haulage roadway 1. The main haulage roadway 1 is used for transporting materials and ventilation.

[0076] S2. See Figure 4 As shown, a roadway 6 and a number of airtight filling strips arranged at intervals along the mining strike are planned in the shortwall working face 2.

[0077] S3. See Figure 4 As shown, mining is carried out along the airtight filling strips planned on the shortwall working face 2. After mining, carbonized materials are used as filling materials, and a number of first filling bodies 7 are formed at intervals in the airtight filling strip area. The first filling bodies 7 are used to support the overlying rock stratum 14 of the target coal seam 17 and to stabilize the mining space. An openable and closable airtight closing door 10 is connected between adjacent first filling bodies 7. The airtight closing door 10 is opened or closed according to actual application requirements to play a role of connection and sealing.

[0078] S4. See Figure 4 As shown, mining is carried out along the roadway 6 planned on the shortwall working face 2 to form the roadway 6, which is used for transporting materials and ventilation.

[0079] It should be noted that, similar to the main haulage roadway 1, a reserved coal pillar 4 with a preset thickness is also reserved on the wall surface of the roadway 6. A load-bearing body 5 is constructed at a position adjacent to the reserved coal pillar 4. The load-bearing body 5 is made of a concrete formed by mixing carbonized materials and cement. The load-bearing body 5 is used to support the surrounding space of the roadway 6 and the overlying unmined coal seam and rock stratum, and to stabilize the roadway 6.

[0080] S5. See Figure 5The shown heading longwall face 3 is filled with carbonized materials as filling materials, and a number of second filling bodies 8 are formed at intervals in the heading direction of the longwall face 3.

[0081] See Figure 6 As shown, a number of groups of third filling bodies 9 corresponding in position are formed at intervals on the opposite side walls of two adjacent second filling bodies 8. The goaf 13 is stabilized by the second filling bodies 8 and the third filling bodies 9, and a storage unit 12 is formed by enclosing the second filling bodies 8, the third filling bodies 9, the roof 15 and the floor 16 of the goaf 13.

[0082] The first filling body 7, the second filling body 8 and the third filling body 9 can also adsorb the leaked carbon dioxide, prevent the carbon dioxide from leaking out, and play a role in adsorption and anti-seepage.

[0083] An openable and closable sealed hatch 11 is connected between single groups of third filling bodies 9, so that the storage units 12 can be independent of each other, and then different storage functions can be realized. The sealed hatch 11 can be selectively opened according to actual needs to realize the connection of adjacent storage units 12, and the application range is wide.

[0084] The storage unit 12 is equipped with power supply, ventilation, air conditioning, communication monitoring and water supply and drainage systems according to actual needs.

[0085] See Figure 1 As shown, after the lower layer of the target coal seam 17 is mined out, the top coal seam of the lower layer is mined back, and at the same time, carbonized materials are used as filling materials to fill the top to form a filling plate 18. Taking the filling plate 18 as the mining platform of the new mining layer of the target coal seam 17, the cyclic operation process of mining, filling, sealing and reservoir construction is repeated to realize the complete mining of the target coal seam 17, as well as carbon dioxide sequestration, goaf filling and reservoir construction.

[0086] In a preferred embodiment, the compressive strength of the carbonized material is determined according to the carbonization degree of the carbonized material. Specifically:

[0087] , where is the compressive strength of the filling body, R c is the carbonization degree of the carbonized material, a is the proportionality coefficient, b is the limit carbonization degree constant;

[0088] The limit span between adjacent filling bodies and the limit width of a single filling body are determined according to the compressive strength of the carbonized material. Specifically:

[0089] The limit span between adjacent filling bodies , where H is the thickness of the overlying strata, in m; is the ultimate tensile strength of the overlying strata, with the unit of MPa; F is the load stress of the overlying strata above the filling body and the reservoir, with the unit of MPa;

[0090] The ultimate width of a single filling body , where l is the length of the goaf roof, with the unit of m; is the filling plastic zone; is the compressive strength of the filling body, with the unit of MPa; is the safety factor;

[0091] , where is the average unit weight of the overlying strata, with the unit of MN / m 3 ; S is the distance from the goaf to the ground surface, with the unit of m;

[0092] , where M is the height of the filling body, with the unit of m; A is the pressure coefficient; d is the mining disturbance coefficient; K is the maximum stress concentration coefficient on the filling body; is the coal seam dip angle; is the cohesion between the filling body and the goaf roof, is the internal friction angle between the filling body and the goaf roof.

[0093] Among them, the calculation formula for the degree of carbonization of the carbonized material is:

[0094] ; where R c is the degree of carbonization of the carbonized material; t is the carbonization reaction time, with the unit of s; is the carbonization rate coefficient; is the humidity effect, is the carbon dioxide concentration effect, is the carbonization degree effect, is the temperature effect.

[0095] Furthermore, is the humidity effect,

[0096] ,

[0097] , where h is the humidity, t is the carbonization reaction time, x is the migration distance, is the apparent permeability of liquid water, is the porosity of coal-based solid waste, is the dynamic viscosity of liquid water, is the water pressure, is the intrinsic diffusion coefficient, is the attenuation coefficient, is the water vapor density, is the influencing factor of humidity;

[0098] is the carbon dioxide concentration effect, , is the carbon dioxide gas density; is the carbonation reaction time t is the pressure of carbon dioxide participating in the carbonation reaction at time is the maximum pressure of carbon dioxide participating in the carbonation reaction;

[0099] is the carbonation degree effect, , R is the carbonation reaction time t is the calcium carbonate content in the carbonized material at time R max is the maximum calcium carbonate content of the carbonized material during the carbonation reaction;

[0100] is the temperature effect, , T is the carbonation reaction temperature, A is the pre-exponential factor, E 0 is the activation energy during the mineralization process;

[0101] , where, is the equivalent heat capacity, B is the effective thermal conductivity, is the specific heat capacity of gaseous carbon dioxide, is the carbon dioxide gas density, is the feeding rate of carbon dioxide, is the specific heat capacity of liquid carbon dioxide, is the density of liquid carbon dioxide, is the feeding rate of pure water, is a dimensionless parameter;

[0102] , where, is the initial pore size of coal-based solid waste, is the attenuation coefficient, x is the migration distance, is the dynamic viscosity coefficient of carbon dioxide, P is the carbon dioxide pressure, R c is the degree of carbonation, is a dimensionless parameter.

[0103] In one embodiment, high-temperature steam is used to carbonize the coal-based solid waste and carbon dioxide in the flue gas emissions.

[0104] In one embodiment, the coal-based solid waste includes fly ash and coal gangue; and / or, the flue gas emissions are one or more of the waste hot gases from coal-fired power plants, steel mills, and chemical plants.

[0105] In one embodiment, referring to Figure 7 as shown, an integrated system for carbon dioxide sequestration, gob filling, and reservoir construction is provided. The device includes: a collection unit 100, a carbonization treatment unit 200, a transportation unit 300, and a filling unit 400.

[0106] Referring to Figure 2 as shown, the collection unit 100 is used to collect carbon dioxide from the coal-based solid waste and flue gas emissions. The carbon dioxide obtained from the emission source 101 and the coal-based solid waste stored in the coal-based solid waste storage station 102 are transported to the carbonization treatment unit 200 by the material transport vehicle 103.

[0107] The carbonization treatment unit 200 is used to carbonize the coal-based solid waste and carbon dioxide to obtain carbonized materials. The carbonization treatment unit 200 includes a carbonization treatment chamber 201 and a carbonized material storage chamber 202. In the carbonization treatment unit 200, high-temperature steam is used to carbonize the coal-based solid waste and carbon dioxide in the flue gas emissions, and the obtained carbonized materials are stored in the carbonized material storage chamber 202, and then transported to the underground gob according to actual needs through the transportation unit 300.

[0108] The filling unit 400 uses the carbonized materials as filling materials to form a number of filling bodies at preset positions in the underground gob, and stabilizes the gob 13 through the filling bodies to form a number of reservoir units 12.

[0109] The mined coal is transported to the factory through the discharge unit 500. A vertical shaft 501 is opened at a position adjacent to the target coal seam 17, and a transfer station 502 connected to the upper opening of the vertical shaft 501 is arranged on the ground.

[0110] The above embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention.

Claims

1. A method for integrating carbon dioxide storage, goaf filling and reservoir construction, characterized in that: include: Collecting carbon dioxide from coal-based solid waste and flue gas, and carbonizing them to obtain carbonized materials; The carbonized material is used as a filling material to fill a plurality of filling bodies at preset positions in the underground goaf, and the goaf is stabilized by the filling bodies to form a plurality of storage units; The compressive strength of the carbonized material is determined according to the carbonization degree of the carbonized material, specifically: , where is the compressive strength of the filling body, R c is the carbonization degree of the carbonized material, a is the proportionality coefficient, b is the limiting carbonization degree constant; The limit span between adjacent filling bodies and the limit width of a single filling body are determined based on the compressive strength of the carbonized material. Specifically: Limit span between adjacent filling bodies , where H is the thickness of the overlying rock layer, in m; is the ultimate tensile strength of the overlying rock strata, in MPa; F is the load stress of the overburden above the filling body and the reservoir, in MPa; Limit width of a single filling body , where l is the length of the goaf roof, in m; To fill the plastic zone; is the compressive strength of the filling body, in MPa; is the safety factor; , where is the average bulk density of the overlying rock, in MN / m 3 ; S is the distance from the goaf to the ground surface, in meters; , where M is the height of the filling body, in m; A is the pressure coefficient; d is the mining disturbance coefficient; K is the maximum stress concentration factor on the filling body; is the coal seam inclination; is the cohesion between the filling body and the top of the goaf, It is the internal friction angle between the filling body and the roof of the goaf.

2. The integrated method for CO2 storage, goaf filling and reservoir construction according to claim 1 is characterized by: The calculation formula for the carbonization degree of the carbonized material is: Where R c is the carbonization degree of the carbonized material; t is the carbonization reaction time, in seconds; is the carbonization rate coefficient; is the humidity effect, is the carbon dioxide concentration effect, is the carbonization degree effect, For the temperature effect.

3. The integrated method for carbon dioxide storage, goaf filling and reservoir construction according to claim 1 or 2, characterized in that: Filling a plurality of filling bodies at a preset position in the goaf specifically includes the following steps: S1, short-wall working face and long-wall working face are planned along the main transport tunnel; S2, planning tunnels and several airtight filling strips arranged at intervals along the mining strike on the short wall working face; S3, mining the planned airtight filling strip, using carbonized material as the filling material, forming a plurality of first filling bodies at intervals in the airtight filling strip area, and connecting adjacent first filling bodies with openable and closable airtight closed doors; S4, planned roadway for mining; S5, excavate the longwall working face, and use carbonized material as filling material, to form several second filling bodies at intervals in the excavation direction of the longwall working face, and several groups of third filling bodies with corresponding positions are formed at intervals on the opposite side walls of two adjacent second filling bodies, the goaf is stabilized by the second filling bodies and the third filling bodies, and the second filling bodies, the third filling bodies and the top and bottom plates of the goaf are combined to form a storage unit.

4. The integrated method of carbon dioxide storage, goaf filling and reservoir construction according to claim 3 is characterized by: The single groups of third filling bodies are connected with sealed hatches that can be opened and closed.

5. The integrated method of carbon dioxide storage, goaf filling and reservoir construction according to claim 3, characterized in that: When excavating to form a transport tunnel or laneway, a coal pillar is reserved on the wall of the transport tunnel or laneway on the side away from the goaf, and a load-bearing body is constructed close to the reserved coal pillar.

6. The integrated method for carbon dioxide storage, goaf filling and reservoir construction according to claim 1, characterized in that: High-temperature steam is used to carbonize coal-based solid waste and carbon dioxide in exhaust gas.

7. The integrated method of carbon dioxide storage, goaf filling and reservoir construction according to claim 1, characterized in that: The coal-based solid waste includes fly ash and coal gangue; And / or, the exhaust flue gas is one or more of waste heat gas from a coal-fired power plant, waste gas from a steel plant, and waste gas from a chemical plant.

8. An integrated system for carbon dioxide storage, goaf filling and reservoir construction, characterized in that: include: A collection unit, used to collect carbon dioxide from coal-based solid waste and flue gas; A carbonization treatment unit, used for carbonizing coal-based solid waste and carbon dioxide to obtain carbonized materials; A conveying unit, used for conveying the carbonized material to the underground goaf; The filling unit uses carbonized material as the filling material and is filled at preset positions in the underground goaf to form a number of filling bodies. The goaf is stabilized by the filling bodies and a number of storage units are formed.

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