CN115493138A - Low-concentration coal mine gas oxidation combustion system and control method thereof - Google Patents
Low-concentration coal mine gas oxidation combustion system and control method thereof Download PDFInfo
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- CN115493138A CN115493138A CN202211151134.4A CN202211151134A CN115493138A CN 115493138 A CN115493138 A CN 115493138A CN 202211151134 A CN202211151134 A CN 202211151134A CN 115493138 A CN115493138 A CN 115493138A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
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- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
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Abstract
The invention discloses a low-concentration coal mine gas oxidation combustion system which comprises a low-temperature countercurrent heat regenerator, a high-temperature heat pipe exchanger and an ignition oxidation reactor, wherein a gas channel and a waste gas channel are arranged inside the low-temperature countercurrent heat regenerator, a methane content detector is also communicated with an inlet of the gas channel of the low-temperature countercurrent heat regenerator, the gas channels of the low-temperature countercurrent heat regenerator, the high-temperature heat pipe exchanger and the ignition oxidation reactor are sequentially communicated, the waste gas channels of the high-temperature heat pipe exchanger are communicated with each other, a heat distributor and a waste heat recovery device are sequentially communicated with the waste gas channel of the high-temperature heat pipe exchanger, and the heat distributor is respectively communicated with the low-temperature countercurrent heat regenerator and the waste heat recovery device through the waste gas channel. The invention realizes the starting and temperature rising of the system through the ignition oxidation reactor; the temperature condition of heat storage combustion is ensured through the one-way heat transfer characteristic of the high-temperature heat pipe; the heat distributor realizes the optimal distribution of heat regeneration and waste heat, and improves the adaptability of the oxidation combustion process.
Description
Technical Field
The invention relates to the technical field of gas combustion, in particular to a low-concentration coal mine gas oxidizing and combusting system, and further relates to a control method of the low-concentration coal mine gas oxidizing and combusting system.
Background
180 hundred million meters per year in China 3 The methane is mixed into the air flow of the mine and is emptied by the ventilation air methane, which means that 3600 more ten thousand tons of coal are wasted, and the coal is 120 hundred million m higher than that of western gas in east China 3 The natural gas is 50 percent higher. On one hand, the method causes serious waste of limited non-renewable resources, if the discharged coal mine gas is utilized, 1m 3 The methane can save 1.23kg of standard coal and reduce 0.83kg of carbon dioxide, on the other hand, the greenhouse effect is aggravated by the emission of the methane, the comprehensive influence of the methane of unit mass on the atmospheric greenhouse effect is Wen Reshi (Global warming potential, GWP) is 21 times that of the carbon dioxide, and the destruction capability on the atmospheric ozone layer is 7 times that of the carbon dioxide. Currently, the method aims at coal mine gas with lower concentration (methane concentration)>8%) is utilized by adopting internal combustion engine and gas turbine technology, and for coal mine gas whose methane concentration is less than 8%, at present, the heat-storage oxidation and catalytic oxidation technologies are mainly adopted to make oxidation reaction of methane in coal mine gas, and when the coal mine ventilation air methane oxidation device is operated, the temperature of middle portion of oxidation bed is higher than that of middle portion of oxidation bedThe temperature of the two sides is gradually reduced, the ventilation air is gradually heated by the heat accumulator after entering the oxidation device, the ventilation air is oxidized to the middle part of the oxidation bed to release the combustion heat of methane, and the oxidized waste gas continuously moves to the other side of the oxidation device to transfer the heat to the heat accumulator to gradually reduce the temperature. The key of the technology is to continuously switch the flowing direction of gas entering an oxidation bed so as to ensure that the ventilation air methane of the coal mine is oxidized in a high-temperature area in the middle of the oxidation bed. Because the catalyst loading of the device is fixed, the temperature adjusting means is limited, the influence of the concentration fluctuation of the coal mine ventilation air methane on the oxidation device is large, the phenomena of failure of a reactor temperature runaway catalyst and the like caused by instability are easy to occur, and the flexibility and adjustability of the device are poor. In the process, heat transfer is realized by alternative operation, the temperature of the discharged flue gas is alternately increased when the switching time is longer in the alternative switching process, partial ventilation air methane is discharged out of the reactor because of no reaction when the switching time is shorter, and meanwhile, because of the operation requirement of the heat storage ceramic of the oxidation device, the latent heat of vaporization of a large amount of water vapor in the flue gas is not effectively recovered, the heat loss of the discharged flue gas is larger, and the economical efficiency is poorer. The key for realizing the efficient utilization of the low-concentration gas is to improve the flexible adaptability of the low-concentration gas and the heat exchange efficiency of the device by improving the heat exchange process.
Disclosure of Invention
The invention aims to provide a low-concentration coal mine gas oxidizing and burning system, which realizes heat recovery by arranging a high-temperature heat pipe and avoids the problems of incomplete combustion and smoke exhaust temperature fluctuation caused by alternate operation.
The invention also aims to provide the control method of the gas oxidizing and combusting system, so that economic, safe and efficient starting of the gas oxidizing and combusting system is realized.
The invention adopts a first technical scheme that a low-concentration coal mine gas oxidation combustion system comprises a low-temperature countercurrent heat regenerator, a high-temperature heat pipe exchanger and an ignition oxidation reactor, wherein a gas channel and a waste gas channel are arranged inside the low-temperature countercurrent heat regenerator, a methane content detector is communicated with a gas channel inlet of the low-temperature countercurrent heat regenerator, the gas channels of the low-temperature countercurrent heat regenerator, the high-temperature heat pipe exchanger and the ignition oxidation reactor are sequentially communicated, the high-temperature heat pipe exchanger is communicated with the waste gas channel of the ignition oxidation reactor, the waste gas channel of the high-temperature heat pipe exchanger is sequentially communicated with a heat distributor and a waste heat recovery device, and the heat distributor is respectively communicated with the low-temperature countercurrent heat regenerator and the waste heat recovery device through the waste gas channel.
The first aspect of the present invention is also characterized in that,
the low-temperature countercurrent regenerator comprises a regenerator shell, a regenerator tube bundle is arranged in the regenerator shell, a waste gas channel is arranged in the regenerator shell, and a gas channel is arranged in the regenerator tube bundle.
The high-temperature heat pipe heat exchanger comprises a heat insulation layer, a plurality of high-heat-conduction ceramic fillers are arranged in the heat insulation layer, a partition plate is arranged in the middle of each high-heat-conduction ceramic filler, a gas channel and a waste gas channel are located on two sides of each partition plate, and a high-temperature heat pipe is arranged between every two adjacent high-heat-conduction ceramic fillers.
The ignition oxidation reactor comprises an adiabatic pouring heat-insulating layer, a gas channel in the adiabatic pouring heat-insulating layer is communicated with a waste gas channel, a high-energy igniter is arranged in the gas channel, and a catalytic oxidation heat accumulator is arranged in the waste gas channel.
The heat distributor comprises a backheating distribution adjusting valve arranged in a waste gas channel between the low-temperature countercurrent heat regenerator and the high-temperature heat pipe exchanger, and also comprises a waste heat distribution adjusting valve arranged in the waste gas channel between the high-temperature heat pipe exchanger and the waste heat recovery device.
The waste heat recovery device comprises a condenser, the condenser is sequentially communicated with a water feeding pump, an economizer and an evaporator through pipelines, the economizer and the evaporator are further communicated with a steam-water separator through pipelines, the steam-water separator is sequentially communicated with a superheater and a steam turbine through pipelines, and one side of the steam turbine is further connected with a generator.
The second technical scheme adopted by the invention is that the control method of the low-concentration coal mine gas oxidation combustion system specifically comprises the following steps:
step 1, introducing the low-concentration gas subjected to dust removal into a methane content detector, and controlling the flow rate of the low-concentration gas entering a low-temperature counter-current heat regenerator according to the methane content;
step 3, fully opening a regenerative distribution damper and fully closing a waste heat distribution damper;
step 4, sequentially introducing low-concentration gas into the low-temperature counter-flow heat regenerator, the high-temperature heat pipe exchanger and the ignition oxidation reactor along the gas channel, and reacting the low-concentration gas in the ignition oxidation reactor to obtain waste gas;
step 6, repeating the step 4 and the step 5;
step 7, when the outlet temperature of the ignition oxidation reactor is raised to 430 ℃, the high-temperature heat pipe conducts the heat of the lower part of the high-temperature heat pipe exchanger to the upper part, and the outlet temperature of the high-temperature heat pipe exchanger is larger than a specified value by controlling the ventilation air flow and the heat distributor;
when the temperature of the outlet of the ignition oxidation reactor rises to 900-1000 ℃, opening a waste heat distribution regulating valve to enable waste gas to enter a waste heat recovery device through the waste heat distribution regulating valve for heat recovery;
and 8, when the content of the low-concentration methane gas fluctuates, controlling the outlet temperature of the ignition oxidation reactor to be maintained at 900-1000 ℃ by using a heat distributor.
The second aspect of the present invention is also characterized in that,
the step 1 specifically comprises the following steps: introducing the dedusted low-concentration gas into a methane content detector, and controlling the low-concentration gas to pass through a tube bundle of a heat regenerator at a flow speed which is greater than the propagation speed of flame in a tube when the methane content in the low-concentration gas is at an explosion limit; when the methane content in the low-concentration gas is less than the explosion limit, the gas enters the regenerator tube bundle at the optimal oxygen content or the optimal temperature flow rate.
The step 7 specified values are specifically:
when the gas concentration is 0.5%, the specified temperature is 778 ℃;
when the gas concentration is 1%, the specified value temperature is 660 ℃;
when the gas concentration is 1.5%, the specified value temperature is 539 ℃;
when the gas concentration is 2%, the specified value temperature is 417 ℃;
when the gas concentration was 2.5%, the specified temperature was 291 ℃.
Step 8, controlling the outlet temperature of the ignition oxidation reactor by using a heat distributor specifically comprises the following steps: when the concentration of methane is higher, the heat distributor controls the opening degree of the waste heat distribution regulating valve to be increased and controls the opening degree of the regenerative distribution regulating valve to be decreased, so that the waste gas input to the waste heat recovery device is increased, and the waste gas input to the low-temperature countercurrent regenerator is reduced;
when the methane concentration is low, the opening degree of the waste heat distribution regulating valve is controlled by the heat distributor to be reduced, the opening degree of the backheating distribution regulating valve is controlled to be increased, the waste gas input of the waste heat recovery device is reduced, and the waste gas input of the low-temperature countercurrent backheat is increased.
The invention has the beneficial effects that:
1. the low-concentration coal mine gas oxidation combustion system realizes heat gradient transmission and energy level matching in the recovery process of high-temperature waste heat and medium-temperature waste heat, improves heat exchange efficiency, reduces heat loss, and extracts the waste heat of gas reaction to the maximum extent.
2. The low-concentration coal mine gas oxidation combustion system disclosed by the invention realizes quick and flexible output distribution of regenerative and waste heat energy, improves the variable load adaptability of the concentration and flow of low-concentration coal mine gas, and realizes real-time flexible adjustment of a large concentration range and a large flow range.
3. The low-concentration coal mine gas oxidation combustion system monitors the gas concentration, flow parameters and the like, and guarantees the safety and reliability of the oxidation combustion process by taking measures of tubular anti-backfire, flexible control of the temperature of an oxidation reactor, no rotating part in the oxidation combustion process and the like.
4. The low-concentration coal mine gas oxidation combustion system provided by the invention realizes heat recovery by arranging the high-temperature heat pipe, avoids the problems of incomplete combustion and exhaust gas temperature fluctuation caused by alternate operation, realizes recovery of vapor latent heat of vaporization in the exhaust gas by optimizing and organizing a heat exchange flow, and realizes flexible adjustment under different gas concentration conditions by adding the heat distributor to avoid a flying temperature instability phenomenon.
Drawings
FIG. 1 is a schematic structural diagram of a low-concentration coal mine gas oxidizing and combusting system according to the invention;
FIG. 2 is a comparison graph of the temperature of the ignition oxidation reactor and the gas concentration in the low-concentration coal mine gas oxidation combustion system.
In the figure, 1, a low-temperature counter-current heat regenerator, 1-1, a heat regenerator shell, 1-2, a heat regenerator tube bundle, 2, a high-temperature heat pipe exchanger, 2-1, a high-temperature heat pipe, 2-2, high-heat-conduction ceramic filler, 2-3, a partition plate, 2-4, a heat insulation layer, 3, an ignition oxidation reactor, 3-1, a high-energy igniter, 3-2, a catalytic oxidation heat accumulator, 3-3, a heat insulation pouring heat insulation layer, 4, a heat distributor, 4-1, a heat regeneration distribution adjusting door, 4-2, a waste heat distribution adjusting door, 5, a waste heat recovery device, 5-1, a waste heat boiler steam-water separator, 5-2, a coal economizer, 5-3, an evaporator, 5-4, a superheater, 5-5, a steam turbine, 5-6, a generator, 5-7, a condenser, 5-8, a water feeding pump and 6, a methane content detector are included.
Detailed Description
The invention is described in detail below with reference to the drawings and the detailed description.
As shown in fig. 1, the low-concentration coal mine gas oxidizing combustion system of the present invention includes a low-temperature counter-flow heat regenerator 1, a high-temperature heat pipe exchanger 2 and an ignition oxidation reactor 3, wherein a gas channel and a waste gas channel are respectively arranged in the low-temperature counter-flow heat regenerator 1, the low-temperature heat pipe exchanger 2 and the ignition oxidation reactor 3, the low-temperature counter-flow heat regenerator 1 is configured to absorb waste heat of intermediate-temperature waste gas, increase the temperature of low-concentration methane in a counter-flow manner, condense water vapor in intermediate-temperature waste gas, extract condensed waste heat in waste gas, release condensed water through a bottom water drain valve, low-concentration gas increased to intermediate temperature enters the high-temperature heat pipe exchanger 2, a gas channel inlet of the low-temperature counter-flow heat regenerator 1 is further communicated with a methane content detector 6 for detecting the methane content in the dedusted low-concentration gas, the low-temperature counter-flow heat regenerator 1, the high-temperature heat pipe exchanger 2 and the gas channel of the ignition oxidation reactor 3 are sequentially communicated, the waste gas channel of the high-temperature heat pipe exchanger 2 and the ignition oxidation reactor 3 are communicated with each other, the waste gas channel of the high-temperature heat pipe exchanger 2 is sequentially communicated with a heat distributor 4 and a waste heat recovery device 5, the waste heat recovery device 5 is configured to recover superheated steam for generating electricity, and the waste heat from the waste heat distributor 4 is respectively communicated with the low-temperature counter-flow heat regenerator 1 and the waste heat regenerator 5.
The low-temperature countercurrent regenerator 1 comprises a regenerator shell 1-1, a regenerator tube bundle 1-2 and a regenerator tube bundle 1-2 are arranged in the regenerator shell 1-1, high-speed flow of low-concentration gas can be realized, tempering in the heating process is prevented, and the safety level of the low-concentration gas is improved.
A waste gas channel is arranged in the heat regenerator shell 1-1, and a gas channel is arranged in the heat regenerator tube bundle 1-2.
The high-temperature heat pipe heat exchanger 2 comprises a heat insulation layer 2-4, a plurality of high-heat-conductivity ceramic fillers 2-2 are arranged in the heat insulation layer 2-4, a partition plate 2-3 is arranged in the middle of each high-heat-conductivity ceramic filler 2-2, a gas channel and a waste gas channel are located on two sides of each partition plate 2-3, and a high-temperature heat pipe 2-1 is arranged between every two adjacent high-heat-conductivity ceramic fillers 2-2. The high-temperature heat pipe heat exchanger 2 transfers the heat of the high-temperature waste gas to the high-heat-conduction ceramic filler 2-2 through the high-temperature heat pipe 2-1, and the low-concentration gas is uniformly heated to a high temperature. The high-temperature heat pipe 2-1 realizes the unidirectional heat conduction and ensures the heat self-sustaining in the heat storage combustion process. The partition plate 2-3 divides the gas before reaction and the exhaust gas after reaction. And the heat insulation 2-4 prevents the heat loss of the high-temperature heat pipe exchanger 2.
The ignition oxidation reactor 3 comprises an adiabatic casting heat-insulating layer 3-3, a gas channel in the adiabatic casting heat-insulating layer 3-3 is communicated with a waste gas channel, a high-energy igniter 3-1 is arranged in the gas channel, and the high-energy igniter 31 adopts modes of an oil burner, a plasma igniter, a gas burner and the like. A catalytic oxidation heat accumulator 3-2 is arranged in the waste gas channel. The ignition oxidation reactor 3 is used for providing initial starting energy at the initial starting stage, the high-energy igniter 3-1 directly oxidizes low-concentration gas introduced around the ignition oxidation reactor and provides initial starting heat for the catalytic oxidation heat accumulator 3-2, and the heat insulation pouring heat preservation layer 3-3 prevents the heat loss of the ignition oxidation reactor 3.
The heat distributor 4 comprises a regenerative distribution damper 4-1 arranged in a waste gas channel between the low-temperature countercurrent heat regenerator 1 and the high-temperature heat pipe exchanger 2, and the heat distributor 4 further comprises a waste heat distribution damper 4-2 arranged in the waste gas channel between the high-temperature heat pipe exchanger 2 and the waste heat recovery device 5. The heat distributor 4 is used for distributing heat of the low-temperature counter-flow heat regenerator 1 and the waste heat recovery device 5, the heat return distribution damper 4-1 can regulate the heat entering the low-temperature counter-flow heat regenerator 1, and the waste heat distribution damper 4-2 can regulate the heat entering the waste heat recovery device 5.
The waste heat recovery device 5 comprises a condenser 5-7, the condenser 5-7 is sequentially communicated with a water feeding pump 5-8, an economizer 5-2 and an evaporator 5-3 through pipelines, a steam-water separator 5-1 is further communicated between the economizer 5-2 and the evaporator 5-3 through a pipeline, the steam-water separator 5-1 is sequentially communicated with a superheater 5-4 and a steam turbine 5-5 through pipelines, and one side of the steam turbine 5-5 is further connected with a generator 5-6. The waste heat recovery device 5 is used for recovering waste heat of medium-temperature waste gas to generate superheated steam for power generation, a water feed pump 5-8 pumps condensed water of a condenser 5-7 into an economizer 5-2 for heating, heated saturated water enters an evaporator 5-3 for evaporation, a steam-water mixture is separated through a steam-water separator 5-1 of a waste heat boiler, the separated saturated steam enters a superheater 5-4 for superheating, and the superheated steam enters a steam turbine 5-5 to drive a generator 5-6 to generate power. The waste heat recovery device 5 may adopt a form of double pressure reheating or triple pressure reheating to improve the waste heat utilization rate of the exhaust gas, and the waste heat recovery device 5 is not limited to a power generation utilization manner, and may adopt a manner of supplying water vapor or high temperature air to utilize the waste heat.
The invention relates to a control method of a low-concentration coal mine gas oxidation combustion system, which specifically comprises the following steps:
step 1, introducing the low-concentration gas subjected to dust removal into a methane content detector 6, and controlling the flow rate of the low-concentration gas entering a low-temperature countercurrent heat regenerator 1 according to the methane content;
and (3) the dedusted low-concentration gas enters the system, whether the methane content of the low-concentration gas is in an explosion limit range is detected, if the low-concentration gas is controlled to pass through the heat regenerator tube bundle 1-2 at a flow rate which is greater than the flame propagation speed in the tube at the explosion limit, and if the low-concentration gas is less than the explosion limit, the low-concentration gas enters the heat regenerator tube bundle 1-2 at an optimal oxygen content or optimal temperature flow rate.
Step 3, fully opening the regenerative distribution damper 41 to enable all the waste gas to enter the counter-flow heat regenerator 1 for heat recovery, and fully closing the waste heat distribution damper 42 to reduce heat emission;
step 4, sequentially introducing low-concentration gas into the low-temperature counter-flow heat regenerator 1, the high-temperature heat pipe exchanger 2 and the ignition oxidation reactor 3 along a gas channel, and reacting the low-concentration gas in the ignition oxidation reactor 3 to obtain waste gas;
step 6, repeating the step 4 and the step 5;
step 7, when the temperature of the outlet of the ignition oxidation reactor 3 rises to 430 ℃, the high-temperature heat pipe 2-1 conducts the heat of the lower part of the high-temperature heat pipe exchanger 2 to the upper part, and the temperature of the outlet of the high-temperature heat pipe exchanger 2 is larger than a specified value by controlling the ventilation air flow and the heat distributor 4;
when the temperature of the outlet of the ignition oxidation reactor 3 rises to 900-1000 ℃, the waste heat distribution adjusting valve 4-2 is opened, so that the waste gas enters the waste heat recovery device 5 through the waste heat distribution adjusting valve 4-2 for heat recovery, at the moment, the low-concentration gas can realize self-sustaining oxidation of heat storage in the catalytic oxidation heat accumulator 32, the waste heat recovery device 5 adopts a turbine following mode to generate electricity, and the flow of the supplied water is controlled so that the temperature of the superheated steam is in a reasonable temperature range of 560-600 ℃.
And 8, when the content of the low-concentration gas methane fluctuates, the temperature of the outlet of the ignition oxidation reactor 3 is increased or decreased along with the fluctuation, and the regenerative heat and the waste heat are distributed by the heat distributor 4 to control the temperature of the outlet of the ignition oxidation reactor 3 to be maintained at 900-1000 ℃.
As shown in fig. 2, in step 7, the specific values are:
when the gas concentration is 0.5%, the specified temperature is 778 ℃;
when the gas concentration is 1%, the specified value temperature is 660 ℃;
when the gas concentration is 1.5%, the specified value temperature is 539 ℃;
when the gas concentration is 2%, the specified value temperature is 417 ℃;
when the gas concentration was 2.5%, the specified temperature was 291 ℃.
Step 8, controlling the temperature of the outlet of the ignition oxidation reactor 3 by using the heat distributor 4 specifically comprises the following steps: when the concentration of methane is higher, the heat distributor 4 controls the opening degree of the waste heat distribution damper 4-2 to be increased and controls the opening degree of the regenerative distribution damper 4-1 to be decreased, so that the waste gas input to the waste heat recovery device 5 is increased, and the waste gas input to the low-temperature counter-flow heat regenerator 1 is reduced;
when the concentration of methane is low, the heat distributor 4 controls the opening degree of the waste heat distribution damper 4-2 to be smaller and controls the opening degree of the regenerative distribution damper 4-1 to be larger, so that the waste gas input to the waste heat recovery device 5 is reduced, and the waste gas input to the low-temperature countercurrent regenerator 1 is increased.
The invention realizes the energy level matching and the cascade utilization of the whole gas oxidizing and burning process of the low-concentration coal mine gas oxidizing and burning system, improves the system operation efficiency, effectively improves the adaptability of the low-concentration coal mine gas oxidizing and burning system to the concentration flow, and ensures the safety of the low-concentration gas oxidizing and burning in the explosion limit range.
Claims (10)
1. Low concentration colliery gas oxidation combustion system, its characterized in that is equipped with low temperature adverse current regenerator (1), high temperature heat pipe exchanger (2) and ignition oxidation reactor (3) of gas passageway and exhaust gas channel including inside, the gas passageway import of low temperature adverse current regenerator (1) still communicates methane content detector (6), the gas passageway of low temperature adverse current regenerator (1), high temperature heat pipe exchanger (2) and ignition oxidation reactor (3) communicates in proper order, the exhaust gas channel intercommunication of high temperature heat pipe exchanger (2) and ignition oxidation reactor (3), the exhaust gas channel of high temperature heat pipe exchanger (2) communicates in proper order has heat distributor (4) and waste heat recovery device (5), heat distributor (4) communicate with low temperature adverse current regenerator (1) and waste heat recovery device (5) respectively through exhaust gas channel.
2. The low-concentration coal mine gas oxidizing combustion system according to claim 1, wherein the low-temperature counter-flow regenerator (1) comprises a regenerator housing (1-1), a regenerator tube bundle (1-2) is arranged in the regenerator housing (1-1), a waste gas channel is arranged in the regenerator housing (1-1), and a gas channel is arranged in the regenerator tube bundle (1-2).
3. The low-concentration coal mine gas oxidizing and burning system according to claim 1, wherein the high-temperature heat pipe heat exchanger (2) comprises a heat insulating layer (2-4), a plurality of high-heat-conductivity ceramic fillers (2-2) are arranged in the heat insulating layer (2-4), a partition plate (2-3) is arranged in the middle of each high-heat-conductivity ceramic filler (2-2), the gas channel and the waste gas channel are located on two sides of each partition plate (2-3), and high-temperature heat pipes (2-1) are arranged between every two adjacent high-heat-conductivity ceramic fillers (2-2).
4. A low concentration coal mine gas oxidizing and burning system as set forth in claim 1, wherein the ignition and oxidation reactor (3) includes a heat insulating and pouring layer (3-3), a gas passage in the heat insulating and pouring layer (3-3) is communicated with an exhaust gas passage, a high energy igniter (3-1) is provided in the gas passage, and a catalytic oxidation heat accumulator (3-2) is provided in the exhaust gas passage.
5. The low-concentration coal mine gas oxidizing and burning system according to claim 1, wherein the heat distributor (4) comprises a regenerative distribution damper (4-1) arranged in the exhaust gas channel between the low-temperature counter-flow heat regenerator (1) and the high-temperature heat pipe exchanger (2), and the heat distributor (4) further comprises a waste heat distribution damper (4-2) arranged in the exhaust gas channel between the high-temperature heat pipe exchanger (2) and the waste heat recovery device (5).
6. The low-concentration coal mine gas oxidizing combustion system according to claim 1, wherein the waste heat recovery device (5) comprises a condenser (5-7), the condenser (5-7) is sequentially communicated with a water feed pump (5-8), an economizer (5-2) and an evaporator (5-3) through pipelines, a steam-water separator (5-1) is further communicated between the economizer (5-2) and the evaporator (5-3) through pipelines, the steam-water separator (5-1) is sequentially communicated with a superheater (5-4) and a steam turbine (5-5) through pipelines, and one side of the steam turbine (5-5) is further connected with a generator (5-6).
7. The control method of the low-concentration coal mine gas oxidizing and combusting system is characterized in that the low-concentration coal mine gas oxidizing and combusting system as claimed in claims 1-6 is used, and the method specifically comprises the following steps:
step 1, introducing the dedusted low-concentration gas into a methane content detector (6), and controlling the flow rate of the low-concentration gas entering a low-temperature countercurrent heat regenerator (1) according to the methane content;
step 2, starting the high-energy igniter (3-1);
step 3, fully opening a regenerative distribution adjusting valve (4-1) and fully closing a waste heat distribution adjusting valve (4-2);
step 4, sequentially introducing low-concentration gas into the low-temperature countercurrent heat regenerator (1), the high-temperature heat pipe exchanger (2) and the ignition oxidation reactor (3) along a gas channel, and reacting the low-concentration gas in the ignition oxidation reactor (3) to obtain waste gas;
step 5, the waste gas obtained in the step 4 is sequentially introduced into the high-temperature heat pipe heat exchanger (2) and the heat distributor (4) through a waste gas channel, and the waste gas completely enters the countercurrent regenerator (1) through a regenerative distribution damper (4-1);
step 6, repeating the step 4 and the step 5;
step 7, when the temperature of the outlet of the ignition oxidation reactor (3) rises to 430 ℃, the high-temperature heat pipe (2-1) conducts the heat of the lower part of the high-temperature heat pipe heat exchanger (2) to the upper part, and the temperature of the outlet of the high-temperature heat pipe heat exchanger (2) is larger than a specified value by controlling the ventilation air flow and the heat distributor (4);
when the temperature of the outlet of the ignition oxidation reactor (3) rises to 900-1000 ℃, opening the waste heat distribution damper (4-2) to enable waste gas to enter the waste heat recovery device (5) through the waste heat distribution damper (4-2) for heat recovery;
and 8, when the content of the low-concentration gas methane fluctuates, controlling the outlet temperature of the ignition oxidation reactor (3) to be maintained at 900-1000 ℃ by using the heat distributor (4).
8. The low-concentration coal mine gas oxidizing and burning system according to claim 7, wherein the step 1 specifically comprises: introducing the dedusted low-concentration gas into a methane content detector (6), and controlling the low-concentration gas to pass through a heat regenerator tube bundle (1-2) at a flow speed which is greater than the propagation speed of flame in a tube when the methane content in the low-concentration gas is at an explosion limit; when the methane content in the low-concentration gas is less than the explosion limit, the gas enters the regenerator tube bundle (1-2) at the optimal oxygen content or the optimal temperature flow rate.
9. The low-concentration coal mine gas oxidizing and burning system according to claim 7, wherein the specified values in step 7 are:
when the gas concentration is 0.5%, the specified temperature is 778 ℃;
when the gas concentration is 1%, the specified value temperature is 660 ℃;
when the gas concentration is 1.5%, the specified value temperature is 539 ℃;
when the gas concentration is 2%, the specified value temperature is 417 ℃;
when the gas concentration was 2.5%, the specified temperature was 291 ℃.
10. The low-concentration coal mine gas oxidizing and burning system according to claim 7, wherein the step 8 of controlling the outlet temperature of the ignition oxidation reactor (3) by using the heat distributor (4) specifically comprises the following steps: when the concentration of methane is higher, the heat distributor (4) controls the opening degree of the waste heat distribution regulating valve (4-2) to be increased and controls the opening degree of the regenerative distribution regulating valve (4-1) to be decreased, so that the waste gas input to the waste heat recovery device (5) is increased, and the waste gas input to the low-temperature countercurrent regenerator (1) is reduced;
when the concentration of methane is low, the heat distributor (4) controls the opening degree of the waste heat distribution regulating valve (4-2) to be reduced and controls the opening degree of the heat return distribution regulating valve (4-1) to be increased, so that the waste gas input to the waste heat recovery device (5) is reduced, and the waste gas input to the low-temperature counter-flow heat regenerator (1) is increased.
Priority Applications (1)
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| US20130244190A1 (en) * | 2010-09-29 | 2013-09-19 | Fortum Corporation | Oxygen combustion system and method for operating same |
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