Method for treating gas oxidation products in coal oxidation process in underground coal mine

Abstract

The invention discloses a method for treating gas oxidation products in a coal oxidation process in an underground coal mine, and belongs to the technical field of fire prevention in the underground coal mine. The method comprises the following steps: firstly, installing a required system, wherein the required system comprises a regulation and control device, a micro-nano bubble generating device, a micro-nano bubble water spraying device, a pressurizing device, a gas product collecting device and a gas product processing device; the method comprises the following steps: collecting accumulated coal, preparing micro-nano bubble water, spraying the micro-nano bubble water to the accumulated coal, collecting gas oxidation products released after the accumulated coal is treated by the micro-nano bubble water through a gas product collecting device, enabling one part of the gas oxidation products to enter a micro-nano bubble generator, and enabling the other part of the gas oxidation products to enter a reaction tower. The micro-nano bubble water is used for humidifying accumulated coal, wetting and oxidizing the accumulated coal, the water content in the coal is increased, the speed of dissipating heat to the environment is increased, spontaneous combustion of the coal is prevented, and meanwhile gas oxidation products can be removed.

Description

Technical Field

[0001] The invention belongs to the technical field of underground fire prevention in coal mines, and in particular relates to a method for treating gas oxidation products in a coal oxidation process in an underground coal mine. Background Art

[0002] Coal spontaneous combustion is one of the main disasters affecting mine safety production and seriously threatens mine safety production. As the mining depth gradually increases and the level of mechanized and intelligent mining on the working face continues to improve, the current situation of coal spontaneous combustion prevention and control remains severe.

[0003] The essence of coal spontaneous combustion is that the heat generation rate of coal oxidation is greater than the speed of heat dissipation to the environment, and the temperature slowly rises to a critical point, leading to spontaneous combustion. At present, coal is mostly suppressed by means of ventilation management, humidification treatment, etc. to suppress the oxidation reaction, thereby preventing coal spontaneous combustion. There are relatively few methods to prevent coal from spontaneously igniting at low temperatures by shortening the oxidation cycle, and the risk is relatively high, because accelerated oxidation may lead to the risk of uncontrolled spontaneous combustion.

[0004] Among the many prevention and control technical means currently, humidification treatment is one of the main means of preventing and controlling coal spontaneous combustion. Water plays an important role in humidification treatment technical means. It has two effects in the coal oxidation process: catalysis in the initial stage of coal spontaneous combustion and inhibition of coal spontaneous combustion. The coal spontaneous combustion process includes the initial stage of low-temperature oxidation, the medium-temperature oxidation self-heating stage, and the accelerated combustion stage. However, the coal spontaneous combustion process has problems such as a long oxidation cycle and the gas products produced will increase the risk of spontaneous combustion, resulting in huge costs for the full cycle of the spontaneous combustion process. At the same time, gas products will increase the risk of spontaneous combustion. Treating oxidized gas products can prevent coal spontaneous combustion to a certain extent. At this stage, there are relatively few means to prevent and control coal spontaneous combustion by promoting the coal oxidation process, shortening the spontaneous combustion cycle, and centrally treating gas oxidation products.

[0005] The means of treating the gas products of the spontaneous combustion process are mostly to collect the oxidation gas products through the gas collection system, and to treat the waste gas through combustion, catalytic oxidation, adsorption and other means. The entire treatment process is carried out in stages, and there are problems such as complexity, low efficiency in collecting and treating harmful waste gases, and long application cycle. At present, there are few materials that can simultaneously promote coal oxidation, absorb oxidation gas products, and shorten the spontaneous combustion process. The treatment system for gas oxidation products in the coal oxidation process is not yet mature.

[0006] Based on this, it is necessary to provide a method for treating gaseous oxidation products during coal oxidation in coal mines underground, explore a multifunctional material that can promote the coal oxidation process and absorb and treat gaseous products, and construct a gaseous oxidation product treatment system during coal oxidation in coal mines underground. It is necessary to realize the simultaneous implementation of various procedures in the treatment system, shorten the use cycle, improve the collection and treatment efficiency, prevent the escape of waste gas from endangering production safety, and thereby improve the technical level of coal spontaneous combustion prevention and control. Summary of the invention

[0007] The purpose of the present invention is to provide a method for treating gas oxidation products in the process of coal oxidation in coal mines. The method applies micro-nano bubble water to the field of coal mines for the first time. The method utilizes a large number of micro-nano bubbles in the micro-nano bubble water. The micro-nano bubble water has excellent properties such as high gas solubility, bubble rupture and interfacial reaction to produce a large number of hydroxyl free radicals to show strong oxidizing properties, which provides a new idea for preventing coal spontaneous combustion in mines. The micro-nano bubble water of the present invention can also weaken the promoting effect of gas oxidation products on coal spontaneous combustion while spraying the accumulated coal.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A method for treating gas oxidation products in a coal oxidation process in a coal mine, comprising the following steps:

[0010] Step 1: Prepare the required system

[0011] The system comprises a control device, a micro-nano bubble generating device, a micro-nano bubble water spraying device, a pressurizing device, a gas product collecting device and a gas product processing device;

[0012] The micro-nano bubble generating device comprises a micro-nano bubble generator and a liquid storage tank connected thereto, wherein the liquid storage tank is used to store NaOH and Cu(OH)2 solutions;

[0013] The micro-nano bubble generator is connected to the micro-nano bubble water spraying device through a high-pressure water pump, and the micro-nano bubble water spraying device is used to spray micro-nano bubble water on the accumulated coal;

[0014] The gas product collecting device is used to collect gas oxidation products released after the accumulated coal is treated with micro-nano bubble water; the pressurizing device is connected to the gas product collecting device;

[0015] The gas product processing device comprises a reaction tower, which is respectively connected to a micro-nano bubble generator and a gas product collecting device, and a glass gas collecting bottle is connected to the outlet of the reaction tower through a pipeline;

[0016] Step 2: Check the air tightness of the system. After confirming that it is good, introduce NaOH, Cu(OH)2 solution and air into the micro-nano bubble generator to prepare micro-nano bubble water;

[0017] Step 3, the micro-nano bubble water is pressurized by a high-pressure water pump and then enters the micro-nano bubble water spraying device, and the micro-nano bubble water is sprayed into the accumulated coal; at the same time, a portion of the micro-nano bubble water is transported to the reaction tower;

[0018] Step 4: After the accumulated coal is treated by the sprayed micro-nano bubble water, the gas oxidation products released during the oxidation process enter the gas product collection device. Under the action of the pressurizing device, part of the gas oxidation products are passed into the micro-nano bubble generator as a gas source, and the other part is passed into the reaction tower for treatment;

[0019] Step 5: After the gas oxidation products react, absorb and oxidize with the micro-nano bubble water in the reaction tower, the untreated gas oxidation products enter the glass gas collecting bottle, and the liquid in the reaction tower enters the liquid storage tank as the water source for the micro-nano bubble generator.

[0020] The above-mentioned method for treating gas oxidation products during coal oxidation in underground coal mines regulates the entire system through the control device to ensure that the treatment efficiency of gas oxidation products is ≥80%.

[0021] The above-mentioned method for treating gas oxidation products in the process of coal oxidation in coal mines, the micro-nano bubble water spraying device includes an atomizing nozzle, and the micro-nano bubble water is atomized by the atomizing nozzle. The flow rate of the micro-nano bubble water spraying device is 0.0105-0.021m 3 / h.

[0022] The above-mentioned method for treating gas oxidation products during coal oxidation in coal mines, the gas product collection device includes a gas product storage tank, a vacuum pump and a tray, the tray is located below the coal, one end of the vacuum pump is connected to the tray, and the other end is connected to the gas product storage tank, the accumulated coal is treated by the sprayed micro-nano bubble water, and the gas products released during the oxidation process pass through the vacuum pump connected to the tray and are finally stored in the gas product storage tank; the released gas products are mainly CO, CO2, C x H y 、H2.

[0023] In the above-mentioned method for processing gas oxidation products during coal oxidation in coal mines, the gas product storage tank and the glass gas collecting bottle are both connected to a gas concentration detector, and the tray is located directly below the atomizing nozzle.

[0024] The above-mentioned method for processing gas oxidation products during coal oxidation in a coal mine, the reaction tower includes a tower body and a distributor located in the tower body, the distributor is a circular plate matching the interior of the tower body, the circular plate is provided with a plurality of distribution holes of uniform size, the distributor is installed at the bottom of the reaction tower, after the gas product enters from the bottom of the reaction tower, the gas product can be evenly distributed under the action of the distributor.

[0025] The above-mentioned method for treating gas oxidation products during coal oxidation in coal mines, wherein the diameter of the distribution holes is 1 to 5 mm; the released gas products CO, CO2, C x H y The concentrations of H2 are 320-450ppm, 820-1200ppm, 70-350ppm, and 120-300ppm respectively; the air intake of the reaction tower is 0.06-0.09m 3 / h.

[0026] In the above-mentioned method for processing gas oxidation products during coal oxidation in coal mines, a moisture desiccant is arranged in the glass gas collecting bottle, and the unprocessed gas oxidation products entering the glass gas bottle are dehydrated by the moisture desiccant.

[0027] In the above-mentioned method for treating gas oxidation products in the process of coal oxidation in coal mines, the concentrations of NaOH and Cu(OH)2 are 20-50 g / L and 5-20 g / L respectively, and the liquid inlet volume of the micro-nano bubble generator is 0.0168-0.0192 m 3 / h, the air intake is 0.00288~0.0033m 3 / h.

[0028] In the above-mentioned method for treating gaseous oxidation products during coal oxidation in a coal mine, in step 3, the water supply pressure of the high-pressure water pump is 0.5-3 MPa, and the water consumption flow rate is 0.0105-0.021 m 3 / h.

[0029] Compared with the prior art, the present invention brings the following beneficial technical effects:

[0030] (1) The present invention proposes a method for treating gaseous oxidation products during coal oxidation in coal mines. Micro-nano bubble water is applied to the coal mine field. Micro-nano bubble water has the functions of absorbing gas and promoting oxidation reactions. From the perspective of the coal spontaneous combustion process, micro-nano bubble technology can be used to absorb oxidation gas products and promote coal oxidation.

[0031] (2) In order to solve the problems of long oxidation period of accumulated coal and heat release from oxidation causing spontaneous combustion of coal, the present invention utilizes the atomizing nozzle of a micro-nano bubble water spray device to humidify the accumulated coal, wet and oxidize the accumulated coal, increase the moisture content in the coal, increase the speed of heat dissipation to the environment, and thus prevent the spontaneous combustion of coal.

[0032] (3) The present invention addresses the problem of different coal wetting abilities of droplets of different sizes by changing the water supply pressure of the high-pressure water pump to control the flow rate, thereby controlling the atomization characteristics of the spray, indirectly controlling the droplet size, and enhancing the coal wetting effect of the droplets, thereby preventing coal from spontaneous combustion.

[0033] (4) The present invention addresses the problem that the gas products released during the oxidation of deposited coal will promote the spontaneous combustion of coal. The gas products released during the oxidation of deposited coal are recovered using a gas product collection device and treated with micro-nano bubble water to reduce the promoting effect of the oxidation products on the spontaneous combustion of coal.

[0034] (5) The present invention is directed to the absorption and oxidation of CO, CO2, C x H y In order to solve the problem of oxidation gas products such as oxidized gas, such as H2, NaOH and Cu(OH)2 are added to the micro-nano bubble water source to efficiently treat the oxidation products, avoiding the use of expensive and environmentally polluting catalysts and chemical reagents, and harmlessly treating the gas products. In view of the different chemical principles of different gas products in the reaction tower, the content of NaOH and Cu(OH)2 in the water source is adjusted to increase the treatment efficiency of the gas products.

[0035] (6) In view of the problem that the gas product enters the reaction tower and contacts the micro-nano bubble water inefficiently, the present invention installs a distributor at the bottom of the reaction tower to disperse the gas product into small bubbles, which is beneficial to promote the reaction and increase the gas product treatment efficiency. In view of the problem that the gas product treatment efficiency is poor, the present invention uses the gas product as a micro-nano bubble gas source to pass into the micro-nano bubble generator, pre-treats part of the gas, reduces the pressure of the reaction tower to treat the gas product, and thus improves the treatment efficiency.

[0036] In summary, the micro-nano bubble technology proposed in the present invention has good application prospects in the field of suppressing coal spontaneous combustion in mines. Its excellent properties can effectively treat oxidation gas products and suppress the process of coal spontaneous combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below in conjunction with the accompanying drawings:

[0038] Figure 1 A schematic diagram of the system structure required for the method of the present invention;

[0039] Figure 2 A top view of the distributor of the present invention;

[0040] Figure 3 This is a schematic diagram of the glass gas collecting bottle and its internal structure of the present invention;

[0041] Figure 4 The figure is a flow chart of the method of the present invention.

[0042] In the figure: 1. Computer; 2. Liquid storage tank; 3. Glass gas collecting bottle; 4. Gas concentration detector; 5. Reaction tower; 6. Micro-nano bubble generator; 7. High-pressure water pump; 8. Pressurizing device; 9. Gas product storage tank; 10. Vacuum pump; 11. Tray; 12. Micro-nano bubble water spraying device; 13. Distributor; 14. Moisture desiccant; 15. Beaker. DETAILED DESCRIPTION

[0043] The present invention proposes a method for treating gaseous oxidation products during coal oxidation in a coal mine. In order to make the advantages and technical solutions of the present invention clearer and more specific, the present invention is further described below in conjunction with specific embodiments.

[0044] The main technical concept of the present invention is to use self-made micro-nano bubble water and apply it to the coal mining field. The micro-nano bubble water will react with the gas products produced during the coal oxidation process. The gas oxidation products produced during the coal oxidation process mainly include: CO, CO2, C x H y , H2, the specific reaction principle is as follows:

[0045] (1) The main reaction of NaOH solution absorbing CO2:

[0046] CO2+2NaOH→Na2CO3+H2O

[0047]

[0048] H2CO3+NaOH→NaHCO3+H2O

[0049] NaHCO3+NaOH→Na2CO3+H2O

[0050] (2) The main reaction of Cu(OH)2 absorbing CO:

[0051] 2Cu(OH)2+CO→Cu2O+2H2O+CuO

[0052] (3)C x H y The main reaction of oxidation by OH in the reaction tower (5)

[0053] C x H y +·OH→C x H y-1 +H2O

[0054] (4) The main reaction of CO oxidation by OH in the reaction tower (5)

[0055] CO+·OH→CO2+H·

[0056] (5) The main reaction of H2 oxidation by OH in the reaction tower (5)

[0057] H2+·OH→2H2O

[0058] The gas oxidation product treatment efficiency mentioned in the present invention is the gas oxidation product absorption efficiency, and its specific calculation formula is:

[0059]

[0060] Wherein: c1 is the concentration of each component in the gas product storage tank (9), ppm; c2 is the concentration of each component in the glass gas collecting bottle, ppm.

[0061] The control device described in the present invention is a computer and a PLC control system. Solenoid valves can be set on the pipelines connecting various components. After the computer collects data, the opening or closing of each solenoid valve is controlled by the PLC control system.

[0062] like Figure 1 As shown, the system required for the method of the present invention includes a control device, a micro-nano bubble generating device, a micro-nano bubble water spraying device, a pressurizing device 8, a gas product collecting device and a gas product processing device.

[0063] The control device is used to control the entire system so that the gas oxidation product treatment efficiency is controlled at more than 80%.

[0064] The micro-nano bubble generating device includes a micro-nano bubble generator 6 and a liquid storage tank 2 connected thereto, wherein the liquid storage tank is used to store NaOH and Cu(OH)2 solutions; the outlet of the liquid storage tank 2 is connected to the inlet of the micro-nano bubble generator 6 through a pipeline, and an electromagnetic valve is preferably arranged on the pipeline to facilitate the control device to control the liquid inlet amount.

[0065] After the solution and air in the liquid storage tank 2 are added to the micro-nano bubble generator 6, micro-nano bubble water is generated. The preferred liquid inlet volume can be 0.0168-0.0192 m 3 / h, air intake volume is 0.00288~0.0033m 3 / h. The prepared micro-nano bubble water has the characteristics of strong wetting ability, high gas solubility and strong oxidizing property. The bubble particle size in the micro-nano bubble water is 0.001-100 μm, and the pH value of the micro-nano bubble water is 3-11.

[0066] The micro-nano bubble generator 6 includes a main unit, a gas dissolving system, a releasing system, etc. Its principle is to generate a large number of nano bubbles. The specific use method thereof can be realized by those skilled in the art by referring to the existing technology.

[0067] The two sides of the micro-nano bubble generator 6 are respectively connected to the high-pressure water pump 7 and the reaction tower 5 of the gas product processing device. The prepared micro-nano bubble water is introduced into the high-pressure water pump 7 and the reaction tower 5. Preferably, a solenoid valve is set in the connecting pipeline.

[0068] The micro-nano bubble water spray device 12 includes a spray pipe and a spray head. The micro-nano bubble water is pressurized by a high-pressure water pump and enters the spray pipe and then enters the spray head. The spray head is provided with a plurality of atomizing nozzles of uniform size to spray the coal directly below it, moistening the coal while promoting oxidation.

[0069] The gas product collection device is used to collect the gas oxidation products released by the accumulated coal after being treated with micro-nano bubble water; the pressurizing device is connected to the gas product collection device; preferably, the gas product collection device includes a reaction tower 5, a gas product storage tank 9, a vacuum pump 10, and a tray 11. The tray 11 is located directly below the coal and is connected to the gas product storage tank 9 through the vacuum pump. The gas product storage tank is connected to the pressurizing device, and the pressurizing device is connected to the reaction tower 5. A glass gas collecting bottle 3 is connected to the outlet of the reaction tower through a pipeline, such as Figure 3 As shown, a moisture desiccant 14 and a beaker 15 are provided in the glass gas collecting bottle 3. The moisture desiccant dries the unreacted gas. The beaker collects the micro-nano bubble water entering from the reaction tower 5. After the collection is completed, it enters the micro-nano bubble generator 6 together with the solution in the liquid storage tank to produce micro-nano bubble water.

[0070] Preferably, the glass gas collecting bottle is equipped with a gas concentration detector 4, and the gas product storage tank 9 is also equipped with a gas concentration detector 4. The gas concentration detector 4 is used to measure the change in gas concentration before and after the reaction to calculate the processing efficiency.

[0071] The CO, CO2, and C x H y , H2 and other oxidizing gas products, one part of which is passed into the micro-nano bubble generator for preparing micro-nano bubble water, and the other part is passed into the reaction tower 5 and dispersed by the distributor 13 to be dispersed into small bubbles, and reacts with the micro-nano bubble water injected into the reaction tower 5 by the micro-nano bubble generator 6 to absorb, catalyze and oxidize; the incompletely treated gas enters the glass gas collecting bottle 3 through the upper part of the reaction tower 5 and is treated by the moisture desiccant 14, and the gas concentration change before and after the reaction is measured by the gas concentration detector 4 to calculate the treatment efficiency, the micro-nano bubble water in the reaction tower 5 enters the beaker 15 in the glass gas collecting bottle 3, and is used together with the liquid in the liquid storage tank 2 as the water source of the micro-nano bubble generator 6, the gas source comes from the air in the early stage, and the remaining part after the gas product is generated and treated is used together with the air as the gas source of the micro-nano bubble generator 6, and the water source and gas source component ratio is regulated by the computer 1 to realize the gas-water two-phase recycling of multiple pipelines.

[0072] like Figure 2 As shown, a distributor 13 is provided at the inlet of the reaction tower 5. The distributor is a circular plate matching the interior of the tower body. The circular plate is provided with a plurality of distribution holes of uniform size. The distributor is installed at the bottom of the reaction tower. After the gas product enters from the bottom of the reaction tower, the gas product can be evenly distributed under the action of the distributor, so that it can fully contact and react with the micro-nano bubble water in the reaction tower, thereby improving the gas treatment efficiency. The preferred aperture of the distribution hole is 1 mm to 5 mm.

[0073] As a preferred embodiment, the water supply pressure of the high-pressure water pump is 0.5-3 MPa, and the flow rate of the consumed micro-nano bubble water is 0.0105-0.021 m 3 / h. The flow rate of micro-nano bubble water entering the reaction tower 5 is 0.0105~0.021m 3 / h, the volume of the reaction tower 5 is 5L, and the gas product enters the reaction tower 5 with an intake volume of 0.06-0.09m 3 / h.

[0074] Preferably, the concentrations of NaOH and Cu(OH)2 in the liquid storage tank 2 are 20-50 g / L and 5-20 g / L, respectively, and the concentrations of CO, CO2, and C x H y The concentrations of gas products such as H2 are 320-450ppm, 820-1200ppm, 70-350ppm and 120-300ppm respectively.

[0075] The present invention will be further described below in conjunction with specific embodiments:

[0076] Embodiment 1:

[0077] Step 1: Using the above system, the NaOH, Cu(OH)2 solution and air in the liquid storage tank 2 are used as the water source and air source of the micro-nano bubble generator 6 to prepare micro-nano bubble water. The water intake of the micro-nano bubble generator is 0.0168-0.0192m 3 / h, air intake volume is 0.00288-0.0033m 3 / h, NaOH and Cu(OH)2 concentrations are 20-50g / L and 5-20g / L respectively.

[0078] Step 2: The micro-nano bubble water enters the high-pressure water pump 7 and the reaction tower 5 through two pipes respectively. The flow rate of the micro-nano bubble water entering the reaction tower 5 and the micro-nano bubble water spraying device 12 is 0.0105-0.021m 3 / h, the high-pressure water pump 7 pressurizes the micro-nano bubble water, and sprays the accumulated coal through the atomizing nozzle 14 in the micro-nano bubble water spraying device 12, which moistens the coal and promotes the oxidation process. The water supply pressure of the high-pressure water pump 7 is 0.5-3MPa, and the water consumption flow rate is 0.0105-0.021m 3 / h.

[0079] Step 3: After the accumulated coal is treated by the sprayed micro-nano bubble water, the gas products released during the oxidation process are stored in the gas product storage tank 9 through the vacuum pump 10 connected to the bottom of the tray 11. The gas products are CO, CO2, C x H y , H2, the gas concentration detector 4 is connected to the gas product storage tank 9 to detect the concentration of each component. The concentrations of the gas products are 320-450ppm, 820-1200ppm, 70-350ppm, and 120-300ppm, respectively. The pressurizing device 8 pressurizes the gas products and passes them into the micro-nano bubble generator 6 and the reaction tower 5 respectively. The gas pipeline connected to the micro-nano bubble generator 6 and the air together constitute a gas source, which reacts with the micro-nano bubble water in the reaction tower 5.

[0080] Step 4: The gas product reacts, absorbs and oxidizes with the micro-nano bubble water in the reaction tower 5. The capacity of the reaction tower 5 is 5L, and the gas product enters the reaction tower 5 with an intake volume of 0.06-0.09m 3 / h, after entering the reaction tower 5, it is processed by a distributor and dispersed into small bubbles to increase the reaction efficiency. The aperture of the distributor is 1mm-5mm. The remaining untreated gas enters the moisture desiccant 14 in the glass gas collecting bottle 3 through the upper part of the reaction tower for dehydration. The gas concentration detector 4 tests the concentration of each component of the remaining gas after dehydration and calculates the treatment efficiency. The liquid in the reaction tower 5 is stored in the beaker 15 in the glass gas collecting bottle 3 through the water supply pipeline at the upper right end, and together with the solution in the liquid storage tank 2, it constitutes the water source of the micro-nano bubble generator 6, which can realize the recycling of water sources.

[0081] The program flow chart for regulating the water and air ratio of the micro-nano bubble generating device is as follows Figure 4As shown, the gas treatment efficiency is monitored in real time by a computer. At the beginning of operation, the air and the solution in the liquid storage tank 2 account for 100% of the gas source and water source of the micro-nano bubble generator 6. The water source 100% means that at the beginning of operation, the water source required by the micro-nano bubble generator is completely provided by the liquid storage tank 2, that is, the liquid in the liquid storage tank 2 accounts for 100% of the water source. After the gas product generated by coal oxidation and the micro-nano bubble water prepared by the micro-nano bubble generator 6 fill the gas product storage tank 9 and the reaction tower 5 respectively, the control program is started to ensure that the water intake and air intake of the micro-nano bubble generator 6 remain unchanged, and the gas product accounts for 20%, 40%, 60%, and 80% of the gas source, and the liquid in the liquid storage tank 2 accounts for 20%, 40%, 60%, and 80% of the water source. The gas treatment efficiency is monitored in real time, and whether the treatment efficiency reaches 80% is used as a basis. When the gas treatment efficiency is reduced, the proportion of air in the gas source can be increased, and the proportion of liquid in the liquid storage tank can be increased.

[0082] Parts not described in the present invention can be implemented by referring to the existing technology.

[0083] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of protection claimed in the present application.

Claims

1. A method for treating gaseous oxidation products during coal oxidation in a coal mine, characterized in that: The following steps are involved: Step 1: Prepare the required system The system comprises a control device, a micro-nano bubble generating device, a micro-nano bubble water spraying device, a pressurizing device, a gas product collecting device and a gas product processing device; The micro-nano bubble generating device comprises a micro-nano bubble generator and a liquid storage tank connected thereto, wherein the liquid storage tank is used to store NaOH and Cu(OH)2 solutions; The micro-nano bubble generator is connected to the micro-nano bubble water spraying device through a high-pressure water pump, and the micro-nano bubble water spraying device is used to spray micro-nano bubble water on the accumulated coal; The gas product collecting device is used to collect gas oxidation products released after the accumulated coal is treated with micro-nano bubble water; the pressurizing device is connected to the gas product collecting device; The gas product processing device comprises a reaction tower, which is respectively connected to a micro-nano bubble generator and a gas product collecting device, and a glass gas collecting bottle is connected to the outlet of the reaction tower through a pipeline; Step 2: Check the air tightness of the system. After confirming that it is good, introduce NaOH, Cu(OH)2 solution and air into the micro-nano bubble generator to prepare micro-nano bubble water; Step 3, the micro-nano bubble water is pressurized by a high-pressure water pump and then enters the micro-nano bubble water spraying device, and the micro-nano bubble water is sprayed into the accumulated coal; at the same time, a portion of the micro-nano bubble water is transported to the reaction tower; Step 4: After the accumulated coal is treated by the sprayed micro-nano bubble water, the gas oxidation products released during the oxidation process enter the gas product collection device. Under the action of the pressurizing device, part of the gas oxidation products are passed into the micro-nano bubble generator as a gas source, and the other part is passed into the reaction tower for treatment; Step 5: After the gas oxidation products react, absorb and oxidize with the micro-nano bubble water in the reaction tower, the untreated gas oxidation products enter the glass gas collecting bottle, and the liquid in the reaction tower enters the liquid storage tank as the water source for the micro-nano bubble generator.

2. The method for treating gaseous oxidation products in the coal oxidation process in a coal mine according to claim 1, characterized in that: The entire system is regulated by the control device to ensure that the gas oxidation product treatment efficiency is ≥ 80%.

3. The method for treating gaseous oxidation products in the coal oxidation process in a coal mine according to claim 1, characterized in that: The micro-nano bubble water spraying device comprises an atomizing nozzle, through which the micro-nano bubble water is atomized. The flow rate of the micro-nano bubble water spraying device is 0.0105-0.021m 3 / h.

4. The method for treating gaseous oxidation products in the coal oxidation process in a coal mine according to claim 3, characterized in that: The gas product collection device includes a gas product storage tank, a vacuum pump and a tray. The tray is located below the coal. One end of the vacuum pump is connected to the tray, and the other end is connected to the gas product storage tank. After the accumulated coal is treated by the sprayed micro-nano bubble water, the gas products released during the oxidation process pass through the vacuum pump connected to the tray and are finally stored in the gas product storage tank. The released gas products are mainly CO, CO2, C x H y 、H2.

5. The method for treating gaseous oxidation products in the coal oxidation process in a coal mine according to claim 4, characterized in that: The gas product storage tank and the glass gas collecting bottle are both connected with a gas concentration detector, and the tray is located directly below the atomizing nozzle.

6. The method for treating gaseous oxidation products in the coal oxidation process in a coal mine according to claim 5, characterized in that: The reaction tower comprises a tower body and a distributor located inside the tower body. The distributor is a circular plate that matches the interior of the tower body. The circular plate is provided with a plurality of distribution holes of uniform size. The distributor is installed at the bottom of the reaction tower. After the gas product enters from the bottom of the reaction tower, the gas product can be evenly distributed under the action of the distributor.

7. The method for treating gaseous oxidation products in the coal oxidation process in a coal mine according to claim 5, characterized in that: The diameter of the distribution holes is 1 to 5 mm; the released gas products CO, CO2, C x H y The concentrations of H2 are 320-450ppm, 820-1200ppm, 70-350ppm, and 120-300ppm respectively; the air intake of the reaction tower is 0.06-0.09m 3 / h.

8. The method for treating gaseous oxidation products in the coal oxidation process in a coal mine according to claim 1, characterized in that: The glass gas collecting bottle is provided with a moisture desiccant, and the untreated gas oxidation products entering the glass gas bottle are dehydrated by the moisture desiccant.

9. The method for treating gaseous oxidation products in the coal oxidation process in a coal mine according to claim 1, characterized in that: The concentrations of NaOH and Cu(OH)2 are 20-50 g / L and 5-20 g / L respectively, and the liquid inlet volume of the micro-nano bubble generator is 0.0168-0.0192 m 3 / h, the air intake is 0.00288~0.0033m 3 / h.

10. The method for treating gaseous oxidation products in the coal oxidation process in a coal mine according to claim 1, characterized in that: In step 3, the water supply pressure of the high-pressure water pump is 0.5-3MPa, and the water consumption flow rate is 0.0105-0.021m 3 / h.

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