A method of treating gaseous oxidation products in the process of coal oxidation in a coal mine underground

Abstract

The application discloses a method for treating gas oxidation products in the process of coal oxidation underground, and belongs to the technical field of fire prevention underground. The steps are as follows: firstly, installing the required system, the required system including a regulating device, a micro-nano bubble generator, a micro-nano bubble water spraying device, a pressurizing device, a gas product collecting device and a gas product processing device; then, preparing micro-nano bubble water, and then spraying the micro-nano bubble water to the accumulated coal, and collecting the gas oxidation products released by the accumulated coal after the treatment of the micro-nano bubble water through the gas product collecting device, part of the gas oxidation products entering the micro-nano bubble generator, and the other part entering the reaction tower. The application utilizes the micro-nano bubble water to wet the accumulated coal, and the accumulated coal is wetted and oxidized, the water content in the coal is increased, and the heat dissipation speed to the environment is increased, so that the coal spontaneous combustion is prevented, and the gas oxidation products can be removed.

Description

Technical Field

[0001] This invention belongs to the field of underground coal mine fire prevention technology, specifically relating to a method for treating gaseous oxidation products during the coal oxidation process in underground coal mines. Background Technology

[0002] Coal spontaneous combustion is one of the major disasters affecting mine safety, seriously threatening mine safety. As mining depth gradually increases and the level of mechanized and intelligent mining in working faces continues to improve, the situation of coal spontaneous combustion prevention and control remains severe.

[0003] The essence of coal spontaneous combustion is that the rate of heat generation from coal oxidation exceeds the rate of heat dissipation to the environment, causing a slow rise in temperature until a critical point is reached, leading to spontaneous combustion. Currently, methods to suppress coal combustion primarily involve ventilation management and humidification treatment to inhibit the oxidation reaction and thus prevent spontaneous combustion. Methods to prevent spontaneous combustion at low temperatures by shortening the oxidation cycle are relatively few and carry higher risks, as accelerated oxidation could lead to uncontrolled spontaneous combustion.

[0004] Among the numerous prevention and control technologies currently available, humidification is one of the main methods for preventing coal spontaneous combustion. Water plays a crucial role in humidification, exhibiting both catalytic and inhibitory effects in the coal oxidation process: catalysis in the initial stage of spontaneous combustion and inhibition of spontaneous combustion. The coal spontaneous combustion process includes a low-temperature oxidation initial stage, a medium-temperature oxidation self-heating stage, and an accelerated combustion stage. However, the long oxidation cycle and the generation of gaseous products that exacerbate the spontaneous combustion risk lead to enormous costs for managing the entire spontaneous combustion cycle. Furthermore, the gaseous products exacerbate the spontaneous combustion risk, and treating these oxidation gaseous products can prevent spontaneous combustion to some extent. Currently, there are relatively few methods for preventing coal spontaneous combustion by promoting the coal oxidation process, shortening the spontaneous combustion cycle, and centrally treating gaseous oxidation products.

[0005] The methods for treating gaseous products from spontaneous combustion processes are mostly to collect oxidation gaseous products through gas collection systems and treat the waste gas through combustion, catalytic oxidation, adsorption and other methods. The entire treatment process is carried out in stages, which has problems such as complexity, low efficiency of collection and treatment of harmful waste gas and long application cycle. At present, there are few materials that can simultaneously promote coal oxidation, absorb oxidation gaseous products and shorten the spontaneous combustion process. The treatment system for gaseous oxidation products in the coal oxidation process is still immature.

[0006] Therefore, there is a need to provide a method for treating gaseous oxidation products during the coal oxidation process in underground coal mines, to explore a multifunctional material that can promote the coal oxidation process and absorb and treat gaseous products, to construct a gaseous oxidation product treatment system for underground coal oxidation, to realize the simultaneous execution of various processes in the treatment system, to shorten the service cycle, to improve the collection and treatment efficiency, to prevent the emission of waste gas from endangering safe production, and to improve the level of coal spontaneous combustion prevention and control technology. Summary of the Invention

[0007] The purpose of this invention is to provide a method for treating gaseous oxidation products during the coal oxidation process in underground coal mines. This method utilizes micro-nano bubble water for the first time in the coal mining field. It leverages the abundant micro-nano bubbles contained within the water, which possesses excellent properties such as high gas solubility and strong oxidizing properties due to the generation of numerous hydroxyl radicals through interfacial reactions caused by bubble collapse. This provides a new approach to preventing spontaneous combustion of coal underground. By spraying accumulated coal with this micro-nano bubble water, the invention can simultaneously reduce the promoting effect of gaseous oxidation products on spontaneous combustion of coal.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A method for treating gaseous oxidation products during coal oxidation in underground coal mines includes the following steps:

[0010] Step 1: Prepare the required system

[0011] The system includes a control device, a micro / nano bubble generator, a micro / nano bubble water spraying device, a pressurization device, a gas product collection device, and a gas product processing device.

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

[0013] The micro-nano bubble generator is connected to the micro-nano bubble water spraying device via a high-pressure water pump. The micro-nano bubble water spraying device is used to spray micro-nano bubble water onto the piled coal.

[0014] The gas product collection device is used to collect the gas oxidation products released from piled coal after micro-nano bubble water treatment; the pressurization device is connected to the gas product collection device.

[0015] The gas product processing device includes a reaction tower, which is connected to a micro / nano bubble generator and a gas product collection device. A glass gas collecting bottle is connected to the outlet of the reaction tower via a pipe.

[0016] Step 2: Check the airtightness 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 to spray micro-nano bubble water into the piled coal; at the same time, a portion of micro-nano bubble water is transported into the reaction tower.

[0018] Step 4: After the piled coal is treated with sprayed micro-nano bubble water, the gaseous oxidation products released during the oxidation process enter the gaseous product collection device. Under the action of the pressurization device, part of the gaseous 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, are absorbed, and oxidized 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 storage tank as the water source for the micro-nano bubble generator.

[0020] The above-mentioned method for treating gaseous oxidation products during the coal oxidation process in underground coal mines uses the aforementioned control device to regulate the entire system and ensure that the gaseous oxidation product treatment efficiency is ≥80%.

[0021] The aforementioned method for treating gaseous oxidation products during coal oxidation in underground coal mines includes a micro-nano bubble water spraying device comprising an atomizing nozzle for atomizing micro-nano bubble water. The flow rate of the micro-nano bubble water spraying device is 0.0105–0.021 m³ / s. 3 / h.

[0022] The above-mentioned method for treating gaseous oxidation products during coal oxidation in underground coal mines includes a gaseous product collection device comprising a gaseous 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 gaseous product storage tank. After the accumulated coal is treated with sprayed micro-nano bubble water, the gaseous products released during the oxidation process are pumped through the tray and finally stored in the gaseous product storage tank. The released gaseous products are mainly CO, CO2, and C. x H y H2.

[0023] The above-mentioned method for treating gaseous oxidation products during the coal oxidation process in underground coal mines includes a gas concentration detector connected to both the gas product storage tank and the glass gas collecting bottle, with the tray located directly below the atomizing nozzle.

[0024] The above-mentioned method for treating gaseous oxidation products during coal oxidation in underground coal mines includes a reaction tower comprising 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 uniformly sized distribution holes. The distributor is installed at the bottom of the reaction tower. After the gaseous products enter from the bottom of the reaction tower, they can be uniformly distributed under the action of the distributor.

[0025] The above-mentioned method for treating gaseous oxidation products during coal oxidation in underground coal mines uses a distribution hole with a pore size of 1-5 mm; the released gaseous products are CO, CO2, and C. x H y The concentrations of H2 were 320–450 ppm, 820–1200 ppm, 70–350 ppm, and 120–300 ppm, respectively; the inlet flow rate of the reaction tower was 0.06–0.09 m³ / s. 3 / h.

[0026] The above-mentioned method for treating gaseous oxidation products during the coal oxidation process in underground coal mines includes a glass gas collecting bottle containing a moisture desiccant, which is used to dehydrate the untreated gaseous oxidation products entering the glass gas bottle.

[0027] The above-mentioned method for treating gaseous oxidation products during coal oxidation in underground coal mines uses NaOH and Cu(OH)2 concentrations of 20–50 g / L and 5–20 g / L, respectively, and the liquid inlet flow rate of the micro / nano bubble generator is 0.0168–0.0192 m³ / L. 3 / h, air intake is 0.00288~0.0033m³ 3 / h.

[0028] In the above-mentioned method for treating gaseous oxidation products during coal oxidation in underground coal mines, in step three, 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 m³ / s. 3 / h.

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

[0030] (1) This invention proposes a method for treating gas oxidation products during the coal oxidation process in underground coal mines. It applies micro-nano bubble water to the coal mining field. Micro-nano bubble water has the functions of absorbing gas and promoting oxidation reaction. 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 view of the problems of long oxidation cycle of piled coal and spontaneous combustion of coal caused by oxidation heat, the present invention uses the atomizing nozzle of micro-nano bubble water spray device to wet the piled coal, wet and oxidize the piled coal, increase the water content in the coal, increase the speed of heat dissipation to the environment, and thus prevent spontaneous combustion of coal.

[0032] (3) In view of the problem that different sizes of droplets have different wetting abilities on coal, the present invention changes 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, enhancing the wetting effect of the droplets on coal, and thus preventing spontaneous combustion of coal.

[0033] (4) In view of the problem that the gaseous products released during the oxidation of piled coal promote the spontaneous combustion of coal, the present invention uses a gaseous product collection device to recover the gaseous products released during the oxidation of piled coal and uses micro-nano bubble water to treat them, thereby reducing the promoting effect of oxidation products on spontaneous combustion of coal.

[0034] (5) This invention is aimed at absorbing and oxidizing CO, CO2, and C. x H y To address the issue of oxidation gaseous byproducts such as H2, adding NaOH and Cu(OH)2 to the micro-nano bubble water source allows for efficient treatment of these byproducts. This avoids the use of expensive and environmentally polluting catalysts and chemical reagents, enabling the harmless treatment of gaseous byproducts. Furthermore, to address the issue of different chemical principles governing the reactions of various gaseous byproducts in the reaction tower, the NaOH and Cu(OH)2 content in the water source is adjusted to increase the treatment efficiency of the gaseous byproducts.

[0035] (6) To address the problem of poor contact efficiency between gaseous products and micro / nano bubble water in the reaction tower, this invention adds a distributor at the bottom of the reaction tower to disperse the gaseous products into small bubbles, which is beneficial to promoting the reaction and increasing the gaseous product processing efficiency. To further address the problem of poor gaseous product processing efficiency, this invention uses the gaseous products as a micro / nano bubble source and introduces them into a micro / nano bubble generator to pre-treat part of the gas, reducing the pressure on the reaction tower and thus improving processing efficiency.

[0036] In summary, the micro-nano bubble technology proposed in this invention has good application prospects in the field of suppressing coal spontaneous combustion in mines. Its excellent properties can effectively treat oxidizing gas products and suppress the coal spontaneous combustion process. Attached Figure Description

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

[0038] Figure 1 This is a schematic diagram of the system structure required by the method of the present invention;

[0039] Figure 2 This is 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 according to the present invention;

[0041] Figure 4 This is a flowchart of the method of the present invention.

[0042] In the diagram: 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. Pressurization device; 9. Gas product storage tank; 10. Vacuum pump; 11. Tray; 12. Micro-nano bubble water spray device; 13. Distributor; 14. Moisture desiccant; 15. Beaker. Detailed Implementation

[0043] This invention proposes a method for treating gaseous oxidation products during the coal oxidation process in underground coal mines. To make the advantages and technical solutions of this invention clearer and more explicit, the invention will be further described below with reference to specific embodiments.

[0044] The main technical concept of this invention lies in: using self-made micro-nano bubble water and applying it to the coal mining field. The micro-nano bubble water reacts with the gaseous products generated during the coal oxidation process. The main gaseous oxidation products generated during the coal oxidation process are: CO, CO2, and 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 reaction tower (5)

[0053] C x H y +·OH→C x H y-1 +H2O

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

[0055] CO + ·OH → CO2 + H·

[0056] (5) The main reaction of H2 being oxidized by ·OH in reaction tower (5)

[0057] H₂ + OH⁻ → 2H₂O

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

[0059]

[0060] In the formula: 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 mentioned in this invention is a computer and PLC control system. Solenoid valves can be installed on the pipelines connecting various components. After the computer collects the data, it controls the opening or closing of each solenoid valve through 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 generator, a micro / nano bubble water spraying device, a pressurization device 8, a gas product collection 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 over 80%.

[0064] The micro-nano bubble generator includes a micro-nano bubble generator 6 and a liquid storage tank 2 connected thereto. The liquid storage tank is used to hold 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 pipe. Preferably, an electromagnetic valve is installed on the pipe to facilitate the control of the liquid inlet flow.

[0065] The solution and air in the storage tank 2 are added together to the micro / nano bubble generator 6 to produce micro / nano bubble water. The preferred inlet volume is 0.0168–0.0192 m³. 3 / h, intake volume is 0.00288~0.0033m³ 3 The prepared micro-nano bubble water has the characteristics of strong wetting ability, high gas solubility and strong oxidizing power. The bubble particle size of the micro-nano bubble water is 0.001-100μm, and the pH of the micro-nano bubble water is 3-11.

[0066] The micro / nano bubble generator 6 includes a main unit, a dissolved gas system, a release system, etc. Its principle is to generate a large number of nano bubbles. The specific usage can be achieved by those skilled in the art by referring to existing technologies.

[0067] The micro-nano bubble generator 6 is connected to a high-pressure water pump 7 and a reaction tower 5 of a gas product processing device on both sides. The prepared micro-nano bubble water is fed into the high-pressure water pump 7 and the reaction tower 5. Preferably, an electromagnetic valve is installed on the connected pipeline.

[0068] The micro-nano bubble water spraying device 12 includes a spray pipe and a spray head. After being pressurized by a high-pressure water pump, the micro-nano bubble water enters the spray pipe and then enters the spray head. The spray head is equipped with several atomizing nozzles of uniform size to spray the coal located directly below it, moistening the coal and promoting oxidation at the same time.

[0069] A gas product collection device is used to collect the gaseous oxidation products released from piled coal after micro-nano bubble water treatment. A 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 via the vacuum pump. The gas product storage tank is connected to the pressurizing device, which is connected to the reaction tower 5. A glass gas collecting bottle 3 is connected to the outlet of the reaction tower via a pipe. 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 that enters from the reaction tower 5. After collection, it enters the micro-nano bubble generator 6 together with the solution in the 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 changes in gas concentration before and after the reaction to calculate the processing efficiency.

[0071] The CO, CO2, and C absorbed by the gaseous product collection device mentioned above x H y The oxidizing gaseous products such as H2 are partially fed into a micro-nano bubble generator to prepare micro-nano bubble water, and the other part is fed into reaction tower 5 and dispersed into small bubbles by distributor 13. These small bubbles react with the micro-nano bubble water injected into reaction tower 5 by micro-nano bubble generator 6 for absorption, catalysis, and oxidation. The incompletely treated gas enters glass gas collecting bottle 3 through the upper part of reaction tower 5 and is treated by moisture desiccant 14. The gas concentration change before and after the reaction is measured by gas concentration detector 4 to calculate the treatment efficiency. The micro-nano bubble water in reaction tower 5 enters beaker 15 in glass gas collecting bottle 3 and together with the liquid in storage tank 2, it serves as the water source for micro-nano bubble generator 6. The gas source is initially from air. The remaining part after gaseous product generation and treatment serves as the gas source for micro-nano bubble generator 6 together with air. The water source and gas source composition ratio is controlled by computer 1 to achieve gas-water two-phase recycling in multiple pipelines.

[0072] like Figure 2 As shown, a distributor 13 is installed at the inlet of the reaction tower 5. The distributor is a circular plate that matches the interior of the tower body. The circular plate has several uniformly sized distribution holes. The distributor is installed at the bottom of the reaction tower. After the gaseous products enter from the bottom of the reaction tower, the distributor can achieve uniform distribution of the gaseous products, allowing them to fully contact and react with the micro-nano bubble water in the reaction tower, thereby improving the gas treatment efficiency. The preferred pore size of the distribution holes is 1mm to 5mm.

[0073] Preferably, the high-pressure water pump has a supply pressure of 0.5–3 MPa and consumes 0.0105–0.021 m³ / h of micro-nano bubble water. 3 / h. The flow rate of micro-nano bubble water entering reaction tower 5 is 0.0105~0.021m³. 3 The reaction tower 5 has a volume of 5L and an inlet flow rate of 0.06–0.09 m³ / h. 3 / h.

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

[0075] The present invention will be further described below with reference to specific embodiments:

[0076] Example 1:

[0077] Step 1: Using the system described above, the NaOH, Cu(OH)₂ solution, and air in the storage tank 2 are used as the water source and air source for the micro / nano bubble generator 6, respectively, to prepare micro / nano bubble water. The water inlet flow rate of the micro / nano bubble generator is 0.0168-0.0192 m³ / h. 3 / h, intake volume is 0.00288-0.0033m³ 3 / h, the concentrations of NaOH and Cu(OH)2 are 20-50g / L and 5-20g / L, respectively.

[0078] Step 2: Micro-nano bubble water enters the high-pressure water pump 7 and the reaction tower 5 through two pipes respectively. The flow rate of micro-nano bubble water entering the reaction tower 5 and the micro-nano bubble water spraying device 12 is 0.0105-0.021 m³ / s. 3 / h, high-pressure water pump 7 pressurizes micro-nano bubble water, which is then sprayed onto the accumulated coal through atomizing nozzles 14 in the micro-nano bubble water spraying device 12. This wets the coal and promotes the oxidation process. The high-pressure water pump 7 supplies water at a pressure of 0.5-3MPa and consumes water at a flow rate of 0.0105-0.021m³ / h. 3 / h.

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

[0080] Step 4: The gaseous products react, are absorbed, and oxidized with micro / nano bubble water in reaction tower 5. Reaction tower 5 has a capacity of 5L, and the inlet flow rate of the gaseous products into reaction tower 5 is 0.06-0.09m³. 3 The gas enters reaction tower 5 and is dispersed into small bubbles by a distributor to increase reaction efficiency. The distributor has an aperture of 1mm-5mm. The remaining untreated gas enters the glass gas collecting bottle 3 through the upper part of the reaction tower and is dehydrated by the desiccant 14. 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 reaction tower 5 is stored in beaker 15 in glass gas collecting bottle 3 through the water supply pipe at the upper right end. Together with the solution in storage tank 2, it forms the water source for micro-nano bubble generator 6, which can realize water recycling.

[0081] The flowchart for regulating the water and air intake ratio of the micro-nano bubble generator is as follows: Figure 4As shown, the gas processing efficiency is monitored in real time using a computer. At the beginning of operation, the air and solution in the storage tank 2 account for 100% of the gas source and water source of the micro-nano bubble generator 6. 100% water source means that at the beginning of operation, the water required by the micro-nano bubble generator is entirely provided by the storage tank 2, i.e., the liquid in the storage tank 2 accounts for 100% of the water source. After the gas products generated from 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 activated. While ensuring that the water and air intake of the micro-nano bubble generator 6 remain constant, the proportion of gas products in the gas source is adjusted to 20%, 40%, 60%, and 80%, and the proportion of liquid in the storage tank 2 to the water source is adjusted to 20%, 40%, 60%, and 80%, respectively. The gas processing efficiency is monitored in real time, and the efficiency is used as a basis for determining whether it reaches 80%. When the gas processing efficiency decreases, the proportion of air in the gas source and the proportion of liquid in the storage tank can be increased.

[0082] Any parts not mentioned in this invention can be achieved by referring to existing technologies.

[0083] Those skilled in the art should recognize that the above embodiments are only used to illustrate this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of protection claimed in this application.

Claims

1. A method of treating gaseous oxidation products in the process of coal oxidation in a coal mine underground, characterised by, The method comprises the following steps: Step one, prepare the required system The system comprises a control device, a micro-nano bubble generator, 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 generator comprises a micro-nano bubble generator and a liquid storage tank connected thereto, and the liquid storage tank is used for placing NaOH and Cu(OH)2 solution; 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 for spraying micro-nano bubble water to the piled coal; The gas product collecting device is used for collecting the gas oxidation product released by the piled coal after micro-nano bubble water treatment, and the pressurizing device is connected to the gas product collecting device; The gas product processing device comprises a reaction tower, which is connected to the micro-nano bubble generator and the gas product collecting device, and a glass gas collecting bottle is connected to the outlet of the reaction tower through a pipeline; Step two, check the air tightness of the system, and after determining 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 three, the micro-nano bubble water is pressurized by the high-pressure water pump and then enters the micro-nano bubble water spraying device to spray micro-nano bubble water into the piled coal; at the same time, a part of the micro-nano bubble water is transported into the reaction tower; Step four, after the piled coal is treated by the sprayed micro-nano bubble water, the gas oxidation product released in the oxidation process enters the gas product collecting device, and under the action of the pressurizing device, part of the gas oxidation product is introduced into the micro-nano bubble generator as a gas source, and the other part is introduced into the reaction tower for treatment; Step five, after the gas oxidation product is treated by reaction, absorption and oxidation in the reaction tower, the untreated gas oxidation product enters the glass gas collecting bottle, and the liquid in the reaction tower enters the liquid storage tank as the water source of the micro-nano bubble generator; The micro-nano bubble water spraying device comprises an atomizing nozzle, and the micro-nano bubble water is atomized through the atomizing nozzle; the flow rate of the micro-nano bubble water spraying device is 0.0105-0.021 m 3 / h. The gas product collecting device comprises a gas product storage tank, a gas suction pump and a tray, the tray is located below the coal, one end of the gas suction pump is connected with the tray, and the other end is connected with the gas product storage tank, the accumulated coal is treated by the sprayed micro-nano bubble water, the gas product released in the oxidation process passes through the gas suction pump connected with the tray, and finally is stored in the gas product storage tank; the released gas product mainly comprises CO, CO2, C x H y , and H2.

2. A method of treating gaseous oxidation products from the oxidation of coal in a coal mine according to claim 1, characterised in that: The whole system is adjusted by the control device to ensure that the treatment efficiency of the gas oxidation product is greater than or equal to 80%.

3. A method of treating gaseous oxidation products in a coal mine according to claim 1, characterised in that: 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.

4. A method of treating gaseous oxidation products in a coal mine according to claim 1, characterised in that: The reaction tower comprises a tower body and a distributor located in the tower body, the distributor is a circular plate matched with the inside of the tower body, a plurality of distribution holes with uniform size are arranged on the circular plate, and the distributor is installed at the bottom of the reaction tower, so that the gas product can be uniformly distributed after entering from the bottom of the reaction tower.

5. A method of treating gaseous oxidation products from the oxidation of coal in a coal mine according to claim 4, characterised in that: The distribution hole has a diameter of 1-5mm; the released gas products CO, CO2, C x H y The concentration of H2 is 320-450ppm, 820-1200ppm, 70-350ppm, 120-300ppm respectively; the gas inlet quantity of the reaction tower is 0.06-0.09m 3 / h.

6. A method of treating gaseous oxidation products in a coal mine according to claim 1, characterised in that: The glass gas collecting bottle is provided with a moisture desiccant, which is used for dehydrating the untreated gas oxidation product entering the glass gas collecting bottle.

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

8. A method of treating gaseous oxidation products in a coal mine according to claim 1, characterised in that: In step three, 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.

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