CN114198136B - Zero-carbon emission method for low-concentration gas in coal mine - Google Patents
Zero-carbon emission method for low-concentration gas in coal mine Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 126
- 230000003647 oxidation Effects 0.000 claims abstract description 86
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 86
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000003546 flue gas Substances 0.000 claims abstract description 63
- 238000010248 power generation Methods 0.000 claims abstract description 35
- 239000002918 waste heat Substances 0.000 claims abstract description 28
- 238000002485 combustion reaction Methods 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 148
- 238000009423 ventilation Methods 0.000 claims description 84
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000005065 mining Methods 0.000 claims description 6
- 239000002699 waste material Substances 0.000 abstract description 8
- 238000004064 recycling Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 239000000919 ceramic Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000005431 greenhouse gas Substances 0.000 description 4
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- 230000001737 promoting effect Effects 0.000 description 2
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- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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Abstract
The invention relates to a zero-carbon emission method for low-concentration gas in a coal mine, which comprises the following steps of: 1) Extracting gas in a goaf of the abandoned coal mine to obtain gas with volume concentration lower than 30%; 2) Treating the gas obtained in step 1) with a concentration lower than 30% in two parts: a) Wherein, a part of gas with the concentration of 8-30 percent is sent into a gas furnace for combustion, the high-temperature flue gas after combustion enters a differential pressure power generation system, and the generated middle-temperature flue gas preheats a gas oxidation system to obtain low-temperature flue gas; b) Mixing the other part of the flue gas with the volume concentration of less than or equal to 0.8%, and then feeding the mixture into a gas oxidation system to obtain high-temperature flue gas; 3) Injecting the low-temperature flue gas obtained in the step 2) in the goaf through a pipeline system; b) And the obtained high-temperature flue gas is sent to a waste heat boiler for waste heat utilization, and the low-temperature flue gas passing through the waste heat boiler is injected into the goaf through a pipeline system. The invention realizes the utilization of low-quality gas of the waste coal mine, and is the recycling of waste resources.
Description
Technical Field
The invention relates to the technical field of comprehensive utilization of low-concentration gas in a coal mine, in particular to a zero-carbon emission method of the low-concentration gas in the coal mine.
Background
The coal mine ventilation gas is also called ventilation air methane, and the methane concentration is lower than 0.75 percent. According to the principle of 'first pumping and then mining' of coal mine gas control, a large amount of coal mine ventilation air methane is generated during coal mining. Although in which CH 4 Low concentration, but large amount of ventilation air methane, and CH contained in ventilation air methane 4 Occupies coal mine gas CH 4 The total amount is more than 80 percent, and the catalyst is hardly utilized. This low concentration of CH in ventilation air methane 4 Can not be directly burnt, and can not be directly burnt,the ventilation air is difficult to develop and utilize, so the ventilation air is directly discharged into the atmosphere for a long time, and huge energy waste and environmental pollution are caused. China discharges CH through ventilation air methane every year 4 The gas transmission quantity is 100-150 billion cubic meters, which is equivalent to the gas transmission quantity of 1 year of the gas transmission from the west to the east, and is equivalent to the direct waste of the energy of 1140-1700 million tons of standard coal. The carbon peak and carbon neutralization 3060 target opens a new low-carbon era, the carbon dioxide emission reaches the peak value about 2030 years, and higher requirements are put on controlling the emission of greenhouse gases. The greenhouse effect of methane is about 28 times of that of carbon dioxide, and the greenhouse gas effect generated by directly discharging ventilation air methane is about 2 hundred million tons of carbon dioxide equivalent, so that the development and utilization of coal mine gas are accelerated, the ventilation air methane is reasonably utilized, and CH (carbon monoxide) can be reduced 4 The discharge amount of the fertilizer can protect the ecological environment and can fully utilize resources.
At present for high concentrations of (>30%) of coal mine gas, and the gas concentration can not be lower than 30% when the coal mine gas is used according to the regulation of coal mine safety regulations. The low-concentration gas with the concentration of 8-30% can be used for generating electricity by adopting an internal combustion engine and a gas turbine. About 1% of ventilation air methane is utilized by the technologies such as the thermal countercurrent oxidation technology, the thermal countercurrent catalytic oxidation technology, the ventilation air methane concentration and the like. The ventilation air and low-concentration gas oxidation power generation can destroy more than 95% of evacuated methane, and a distributed clean energy system is built by using low-concentration gas resources, so that the method conforms to the gas control policy of 'pumping promotion'. Oxidation of CH with ventilation air methane 4 Conversion to CO 2 The emission of greenhouse gases is reduced, and great environmental benefits are brought; the heat generated by the reaction can be used for heating or power generation, and better economic benefit can be generated.
At present, the low-concentration gas in the coal mine has the following treatment modes: 1) Ventilation air methane is directly discharged into the atmosphere, and methane gas in the methane is a main greenhouse gas, so that a remarkable greenhouse effect is caused; 2) The device is used for torch combustion, wastes energy and has potential safety hazard; 3) The gas turbine is used for power generation, the gas turbine has large investment in the initial power generation stage, large gas quantity and high and stable concentration; the scale effect is needed, small and medium-sized abandoned coal mines and coal mines have poor connectivity, and the gas concentration is unstable, so that large-scale power generation is difficult to carry out, the economic benefit is poor, and the risk is high; 4) The device is used for a heat storage oxidation device, adopts a heat countercurrent technology, and is used for maintaining large gas consumption and low heat energy utilization efficiency. Therefore, smoke generated by low-concentration gas combustion power generation and ventilation air oxidation is directly discharged into the atmosphere after waste heat and residual pressure utilization, so that the environment is polluted, and the carbon emission is increased; on the one hand, the residual heat of the smoke part is not utilized. Therefore, an effective method for realizing low-concentration gas control of the coal mine is urgently needed.
Disclosure of Invention
The invention aims to overcome the problems and provide a zero-carbon emission method for low-concentration gas in a coal mine, so as to realize treatment of the low-concentration gas and ventilation air methane in the coal mine.
In order to achieve the aim, the invention provides a zero-carbon emission method for low-concentration gas in a coal mine, which comprises the following steps of:
1) Extracting gas in the goaf of the waste coal mine to obtain gas with the volume concentration of less than 30%;
2) Treating the gas obtained in step 1) with a concentration lower than 30% in two parts: a) Wherein, a part of gas with the concentration of 8-30% is sent into a gas furnace for combustion, the high-temperature flue gas after combustion enters a differential pressure power generation system for power generation, the medium-temperature flue gas generated after power generation is subjected to waste heat utilization, and the medium-temperature flue gas enters a gas oxidation system for preheating to obtain low-temperature flue gas; b) Mixing the other part of the gas with the volume concentration of less than or equal to 0.8% to ensure that the volume concentration of the mixed gas reaches 0.8-1.2%, and then feeding the mixed gas into a gas oxidation system for oxidation to obtain high-temperature flue gas;
the distribution processing of the two parts of gas is dynamically adjusted and determined according to the matching of the concentration of the gas entering the gas furnace, the concentration of the gas entering the ventilation air methane oxidation device, the heat generated by the combustion of the gas furnace, the heat consumed by the differential pressure power generation and the heat required by the preheating of the ventilation air methane oxidation device, and the proportion of the two parts of gas is dynamically adjusted.
3) Injecting the low-temperature flue gas obtained in the step 2) in the goaf through a pipeline system; b) The obtained high-temperature flue gas is sent into a waste heat boiler for waste heat utilization, and the low-temperature flue gas passing through the waste heat boiler is injected into a gob through a pipeline system;
wherein, the temperature of the high-temperature flue gas in the step 2) and the step 3) is 650-750 ℃, the temperature of the medium-temperature flue gas is 500-600 ℃, and the temperature of the low-temperature flue gas is less than 180 ℃.
Preferably, the gas in the step 1) is extracted from the gas with a concentration of less than 30% (volume concentration in the present invention) in each drill hole of the goaf by means of a vacuum pump and a pipeline system in a manner of passing through the drill hole (not filled) left in the coal mining stage and a newly added drill hole.
Preferably, the gas oxidation system in the step 2) comprises a ventilation air methane oxidation device; or the device comprises a combination of a preheater and a ventilation air methane oxidation device, wherein the preheater and the ventilation air methane oxidation device are sequentially connected. The original ventilation air methane oxidation device adopts a thermal countercurrent oxidation technology, and a countercurrent valve needs to be adjusted to change the direction of periodic air flow so as to balance the temperature in the oxidation device. The invention adds the preheater to preheat the ventilation air entering the oxidation device, or directly preheats the oxidation device, thereby ensuring the temperature and heat required by the reaction in the oxidation device.
Preferably, the medium-temperature flue gas generated after combustion in the step 2) directly enters a preheating oxidation bed of the ventilation air methane oxidation device, or firstly enters a preheater to preheat ventilation air methane, and then enters the preheating oxidation bed of the ventilation air methane oxidation device; so as to ensure the temperature and heat required by ventilation air oxidation. Preheating ventilation air methane or preheating low-temperature flue gas (mainly CO) after a ventilation air methane oxidation device 2 And H 2 O) and low-temperature flue gas after the waste heat boiler are injected into a gob through a pipeline system.
Preferably, the differential pressure power generation system in the step a) is a micro distributed power generation system, and the micro distributed power generation system comprises one or more differential pressure generator sets. And configuring according to the energy requirement of the system. The gas with the volume concentration of less than or equal to 0.8% in the step b) comprises ventilation air methane with the volume concentration of less than or equal to 0.8% extracted by a ventilation pipeline system and/or gas with the volume concentration of less than or equal to 0.4% extracted from a drill hole. Namely, ventilation air (the concentration is less than or equal to 0.8%) extracted by the original ventilation pipeline system and ultra-low concentration gas (the concentration is less than or equal to 0.4%) extracted from a drill hole firstly enter a blender to be blended with the gas with the concentration less than 30%, and the ventilation air and the ultra-low concentration gas reach the concentration of 0.8-1.2% and enter a ventilation air oxidation device for oxidation. Namely, when the volume concentration of the ventilation air methane is lower than 0.8%, adding gas with the concentration lower than 30% for mixing so as to ensure that the volume concentration of the gas entering the ventilation air methane oxidation device is between 0.8 and 1.2%, and determining the installed scales of the differential pressure generator set and the ventilation air methane oxidation device according to the matching of the heat generated by the combustion of the gas furnace, the heat consumed by the differential pressure power generation and the heat required for preheating of the ventilation air methane oxidation device.
The invention relates to a differential pressure power generation method, which utilizes gas with concentration of 8-30% to burn in a gas furnace, and high-temperature flue gas with pressure energy and heat energy does work through differential pressure turbine expansion, so that the high-temperature flue gas is converted into mechanical energy to drive a generator to generate power. The large-scale gas turbine has large initial investment, large gas demand, high required gas concentration, high energy consumption and poor economical efficiency. The adoption of a plurality of 50-500 kw miniature gas furnaces has lower initial investment and better economical efficiency than a large-scale gas turbine, the adoption of miniature distributed arrangement is convenient for system adjustment, and the start-stop allocation of a differential pressure generator set can be carried out according to the gas quantity; the differential pressure power generation has a wide application range for the gas concentration, and the gas with the concentration of 8-30% can be directly utilized without pretreatment.
The invention utilizes the medium-temperature flue gas generated by the differential pressure power generation system, firstly, a preheater is added in front of the ventilation air methane oxidation device to directly preheat the gas with the concentration of 0.8-1.2%, thereby improving the temperature of the ventilation air methane entering the ventilation air methane oxidation device; secondly, medium-temperature flue gas is introduced into the ventilation air methane oxidation device to preheat the whole oxidation bed so as to keep the temperature of the oxidation bed stable and simultaneously maintain the temperature at two ends of the oxidation device to meet the oxidation requirement. The device for preheating or pre-oxidizing the ventilation air can keep the temperature required by methane oxidation in the gas, reduce the temperature difference of the inlet and the outlet of the oxidation bed and further improve the methane conversion rate.
Preferably, in the step 3), the waste heat of the waste heat boiler heats the feed water pumped by the feed water pump to obtain steam, the obtained steam pushes the steam turbine to do work, the wet steam after doing work enters the condenser to be condensed, and the condensed water is recycled; alternatively, the obtained steam is used to produce domestic hot water. The invention utilizes the waste heat of the high-temperature flue gas after the ventilation air methane oxidation, heats the waste heat boiler, and drives the steam turbine to do work or generate domestic hot water.
The invention forms a set of energy natural circulation system based on low-concentration gas, fully utilizes the residual heat and pressure of power generation and oxidation of the low-concentration gas, and simultaneously injects low-temperature flue gas back into the gob, thereby reducing the influence of the direct emission of the flue gas into the atmosphere on the greenhouse effect of the environment. Low-temperature flue gas is reinjected into the goaf, so that on one hand, the heat preservation effect is realized on the goaf, and the diffusion and overflow of the gas are facilitated; on the other hand, the low-temperature flue gas contains a large amount of CO 2 ，CO 2 After the coal is injected into the gob, the coal can be inhibited from generating CO in underground oxidation to generate spontaneous combustion, and the safety production protection effect is achieved; furthermore, coal to CO 2 The adsorption capacity of (A) is methane to CO 2 The adsorption capacity of the adsorption material is 2-3 times, which is beneficial to promoting the analysis, migration, diffusion and overflow of the gas, improving the concentration of the gas and stabilizing the concentration and the amount of the gas.
Compared with the prior art, the invention has the advantages that:
1) The invention realizes the treatment of low-concentration gas and ventilation air methane in coal mines, the greenhouse effect of methane GWP100 is 28 times that of carbon dioxide, the methane is converted into the carbon dioxide, the greenhouse effect is obviously reduced, and the invention has environmental protection significance.
2) The invention realizes the utilization of low-quality gas of the waste coal mine, and is the recycling of waste resources.
3) The micro-distributed differential pressure power generation is adopted, so that the initial investment is reduced, the economy is good, and the micro-distributed differential pressure power generation device can adapt to wide-range gas concentration; the cascade utilization of energy is realized by adopting differential pressure power generation, ventilation air waste heat, a waste heat boiler and the like, and the comprehensive energy utilization rate is improved.
4) The medium-temperature flue gas after the gas combustion is used for preheating ventilation air methane or a ventilation air methane oxidation device, so that the temperature required by ventilation air methane oxidation is ensured, and the methane conversion rate is improved.
Drawings
FIG. 1 is a flow chart of zero carbon emission of low-concentration gas in a coal mine according to the invention;
FIG. 2 is a flow chart of coal mine low-concentration gas zero-carbon emission waste heat utilization;
FIG. 3 is a flow chart of the coal mine low concentration gas zero carbon emission preheating process of the present invention;
FIG. 4 is a flow chart of zero-carbon-emission preheating and waste heat utilization of low-concentration gas in a coal mine.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1
The invention provides a zero-carbon emission method for low-concentration gas in a coal mine, which specifically comprises the following steps:
1) A certain abandoned coal mine is taken as an object, and gas with the concentration lower than 30% in each drill hole of a goaf is extracted by using the drill hole (not filled) left in the coal mining stage and the newly added drill hole and adopting a vacuum pump and a pipeline system.
2) The gas pipeline with the concentration lower than 30% is divided into two branches, one branch of the pipeline feeds a part of gas with the concentration of 8% -30% into the gas furnace for combustion, and the high-temperature flue gas after combustion enters the differential pressure power generation system for power generation. The differential pressure generator set is a micro distributed system, the differential pressure generator set has a power range of 50-500 kw and can be selected, in the case, 3 differential pressure generator sets of 500kw are selected according to the gas quantity, and the configuration of 1-3 differential pressure generator sets is selected according to the gas quantity requirement in actual operation. The medium-temperature flue gas after power generation directly enters the ventilation air methane oxidation device to preheat the oxidation bed so as to ensure the temperature and heat required by ventilation air methane oxidation.
3) Ventilation air (the concentration is less than or equal to 0.8%) extracted by an original ventilation pipeline system and ultra-low concentration gas (the concentration is less than or equal to 0.4%) extracted by drilling firstly enter a blender, and simultaneously, another pipeline branch of the gas with the concentration less than 30% is added for blending so as to ensure that the concentration of the gas entering a ventilation air oxidation device is between 0.8 and 1.2%.
4) The medium temperature flue gas with the temperature of 500-600 ℃ generated by the differential pressure power generation system is introduced into a ceramic oxidation bed of the ventilation air methane oxidation device for preheating, so that the temperature of the central high-temperature area of the ceramic oxidation bed is always maintained at about 650-750 ℃. The ceramic oxidation bed is continuously preheated by the medium-temperature flue gas, so that the high-temperature area of the oxidation bed can be widened, the temperature difference between the inlet and the outlet of the ceramic oxidation bed is reduced, the aim of maintaining the temperature and heat required by ventilation air methane oxidation is fulfilled, and further, the full oxidation and heat extraction of methane in ventilation air are realized. The methane conversion rate can be improved by about 4 percent by preheating the ceramic oxidation bed.
5) The gas with the concentration of 0.8-1.2% is oxidized in a ventilation air methane oxidation device to generate high-temperature flue gas with the temperature of 650-750 ℃.
6) The high-temperature flue gas at 650-750 ℃ generated by the ventilation air methane oxidation device enters a waste heat boiler for waste heat utilization, the feed water pumped by a feed water pump is heated to obtain steam, a steam turbine is pushed to do work, the wet steam after doing work enters a condenser for condensation, and the condensed water is recycled.
7) And (3) preheating low-temperature flue gas (< 180 ℃) after the ventilation air oxidation device and low-temperature flue gas (< 180 ℃) after the waste heat boiler, and injecting the flue gas back to the underground of the goaf through a pipeline system, as shown in the figure 1-2.
Example 2
The invention provides a zero-carbon emission method for low-concentration gas in a coal mine, which specifically comprises the following steps:
1) A certain abandoned coal mine is taken as an object, and gas with the concentration lower than 30% in each drill hole of a goaf is extracted by using the drill hole (not filled) left in the coal mining stage and the newly added drill hole and adopting a vacuum pump and a pipeline system.
2) The gas pipeline with the concentration lower than 30 percent is divided into two branches, one branch of the pipeline sends a part of gas with the concentration of 8 percent to 30 percent into the gas furnace for combustion, and the high-temperature flue gas after combustion enters a differential pressure power generation system for power generation. The differential pressure generator set is a micro distributed system, the differential pressure generator set has a power range of 50-500 kw and can be selected, in the case, 3 500kw differential pressure generator sets are selected according to the gas quantity, and the configuration of 1-3 differential pressure generator sets is selected according to the gas quantity in actual operation. The medium-temperature flue gas after power generation enters a preheater to preheat the ventilation air so as to ensure the temperature and heat required by ventilation air oxidation.
3) Ventilation air methane (the concentration is less than or equal to 0.8%) extracted by an original ventilation pipeline system and ultra-low concentration gas (the concentration is less than or equal to 0.4%) extracted from a drill hole firstly enter a blender, and simultaneously, another pipeline branch of the gas with the concentration less than 30% is added for blending so as to ensure that the concentration of the gas entering a ventilation air methane oxidation device is between 0.8 and 1.2%.
4) The 500-600 ℃ middle temperature flue gas discharged by the differential pressure power generation system is introduced into a preheater in front of the ventilation air methane oxidation device to preheat the gas with the concentration of 0.8-1.2%, and the temperature of the ventilation air methane entering an inlet of the ventilation air methane oxidation device is increased to 300-400 ℃, so that the temperature of a central high-temperature area of the ceramic oxidation bed is always maintained at 650-750 ℃. By improving the temperature of the imported ventilation air, the high-temperature area of the oxidation bed can be widened, the temperature difference between the inlet and the outlet of the ceramic oxidation bed is reduced, the full oxidation and heat extraction of methane in the ventilation air are facilitated, and the methane conversion rate is improved by about 4%.
5) Oxidizing the gas with the concentration of 0.8-1.2% in a ventilation air methane oxidation device to generate high-temperature flue gas with the temperature of 650-750 ℃;
6) The high-temperature flue gas at 650-750 ℃ generated by the ventilation air methane oxidation device enters a waste heat boiler for waste heat utilization, the feed water pumped by a feed water pump is heated to obtain steam, a steam turbine is pushed to do work, the wet steam after doing work enters a condenser for condensation, and the condensed water is recycled.
7) The low-temperature flue gas (< 180 ℃) after preheating the ventilation air oxidation device and the low-temperature flue gas (< 180 ℃) after the waste heat boiler are injected back to the underground of the goaf through a pipeline system, so that the goaf is insulated, the effect of promoting methane to be resolved and overflowed is achieved, and the CO spontaneous combustion is inhibited (as shown in figures 3-4).
Conventional technical knowledge in the art can be used for the details which are not described in the present invention.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or substituted with equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered by the scope of the claims of the present invention.
Claims (6)
1. A zero-carbon emission method for low-concentration gas in a coal mine comprises the following steps:
1) Extracting gas in a goaf of the abandoned coal mine to obtain gas with volume concentration lower than 30%;
2) Treating the gas obtained in step 1) with a concentration lower than 30% in two parts: a) Wherein, a part of gas with the concentration of 8-30% is sent into a gas furnace for combustion, the high-temperature flue gas after combustion enters a differential pressure power generation system for power generation, and the generated medium-temperature flue gas preheats a gas oxidation system to obtain low-temperature flue gas; b) Mixing the other part of the flue gas with the volume concentration of less than or equal to 0.8% to ensure that the volume concentration of the mixed flue gas reaches 0.8-1.2%, and then feeding the mixed flue gas into a flue gas oxidation system for oxidation to obtain high-temperature flue gas; wherein, the gas oxidation system comprises a ventilation air methane oxidation device; or, the device comprises a combination of a preheater and a ventilation air methane oxidation device, wherein the preheater and the ventilation air methane oxidation device are sequentially connected;
3) Injecting the low-temperature flue gas obtained in the step 2) in the goaf through a pipeline system; b) The obtained high-temperature flue gas is sent to a waste heat boiler for waste heat utilization, and the low-temperature flue gas passing through the waste heat boiler is injected into a goaf through a pipeline system;
wherein, the temperature of the high-temperature flue gas in the step 2) and the step 3) is 650-750 ℃, the temperature of the medium-temperature flue gas is 500-600 ℃, and the temperature of the low-temperature flue gas is less than 180 ℃.
2. The method as claimed in claim 1, wherein the gas in step 1) is extracted from the holes in each goaf with a vacuum pump and a pipeline system by means of the holes left in the coal mining stage and the holes newly added.
3. The method of claim 1, wherein the medium-temperature flue gas in the step 2) directly enters the preheating oxidation bed of the ventilation air methane oxidation device or enters the preheater to preheat ventilation air methane first and then enters the preheating oxidation bed of the ventilation air methane oxidation device.
4. The method according to claim 1, wherein the differential pressure power generation system in step a) is a micro distributed power generation system, and the micro distributed power generation system comprises one or more differential pressure generator sets.
5. The method according to claim 1, wherein the gas with the volume concentration of 0.8% or less in the step b) comprises ventilation air methane with the volume concentration of 0.8% or less extracted from a ventilation pipeline system and/or gas with the volume concentration of 0.4% or less extracted from a drill hole.
6. The method according to claim 1, characterized in that in the step 3), the waste heat of the waste heat boiler heats the feed water pumped by the feed water pump to obtain steam, the obtained steam pushes the steam turbine to do work, the moisture-containing steam after doing work enters a condenser to be condensed, and the condensed water is recycled; alternatively, the obtained steam is used to produce domestic hot water.
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| CN202111321421.0A CN114198136B (en) | 2021-11-09 | 2021-11-09 | Zero-carbon emission method for low-concentration gas in coal mine |
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