CN113375175A - Coal mine gas regenerative oxidation method - Google Patents
Coal mine gas regenerative oxidation method Download PDFInfo
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- CN113375175A CN113375175A CN202110798530.5A CN202110798530A CN113375175A CN 113375175 A CN113375175 A CN 113375175A CN 202110798530 A CN202110798530 A CN 202110798530A CN 113375175 A CN113375175 A CN 113375175A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Incineration Of Waste (AREA)
Abstract
The invention provides a coal mine gas regenerative oxidation method, which belongs to the technical field of coal mine gas utilization, coal mine gas with the concentration of less than 30% is adjusted to 1.2% -3% and sent into a regenerative oxidation device, and regenerative oxidation of ultra-low concentration gas is realized by adjusting the flow velocity of the gas in the regenerative oxidation device. The invention has the advantages of high safety, high reliability and high economical efficiency.
Description
Technical Field
The invention belongs to the technical field of coal mine gas utilization, and particularly discloses a coal mine gas regenerative oxidation method.
Background
According to the stipulations of coal mine safety regulations: the reason why the gas concentration is not lower than 30% when the gas is used is that the gas with the concentration lower than 30% contains explosion dangerous gas with the methane concentration within the range of 5% -16%, and the gas is generally forbidden to be used for safety reasons, but the direct discharge wastes resources and pollutes the environment. With the development of science and technology, the utilization of gas with the concentration of less than 30% is also newly developed, and at present, the utilization of low-concentration and ultra-low-concentration gas mainly has the following four ways.
1. Gas power generation: the low-concentration gas power generation is realized by adopting a coal mine low-concentration gas power generator set and a conveying safety guarantee technology.
2. Gas concentration: the pressure swing adsorption technology and the low temperature liquefaction separation technology are adopted to concentrate the low concentration gas of the coal mine into high concentration gas which is used as civil fuel, chemical raw material and the like.
3. Blending and burning: the low-concentration and ultra-low-concentration gas of the coal mine is used as auxiliary fuel of an industrial boiler to be mixed and combusted with coal, and power generation or other heat energy utilization is carried out.
4. Oxidizing and utilizing gas: the low-concentration and ultra-low-concentration gas pumped and discharged is mixed with the coal mine ventilation air methane to carry out oxidation reaction, and the heat energy generated by the oxidation reaction is utilized to carry out power generation, refrigeration and heating, so as to carry out the stepped utilization of heat.
Aiming at the gas oxidation utilization, the concentration of the coal mine ventilation air methane is generally less than 1%, and the prior art has heat storage oxidation, regenerative oxidation and the like. After a working period, the regenerative thermal oxidizer reverses the gas flow direction, such as a ventilation gas oxidation system capable of recovering heat energy disclosed in CN201110276483.4, and a coal mine ventilation air methane oxidation system disclosed in CN201410099396. According to statistics, the safety accidents of the thermal storage oxidation device are almost related to the flow direction switching faults. Due to frequent and rapid flow direction switching, the flow fluctuates in the switching process, and the concentration mixing device is not in time to adjust, so that the concentration also fluctuates; flow direction switching faults easily lead to concentration regulation out of control.
And the heat-storage oxidation device requires that the volume concentration of methane in the gas passing through the gas mixer is lower than 1.2% (coal engineering, No. 51, No. 3, safe mixing process design of gas heat-storage oxidation low-concentration gas), and the utilization efficiency of gas oxidation is lower.
Regarding the regenerative oxidation technology, CN202096885U discloses a multi-stage regenerative low-concentration gas heat countercurrent catalytic oxidation device, which is used for purifying low-concentration gas flue gas and utilizing the reaction heat thereof, and comprises a gas catalytic oxidation reactor, wherein the gas inlet pipe of the gas catalytic oxidation reactor is connected with a low-concentration gas flue gas discharge pipeline through a heat regenerator, and the gas inlet pipe of the heat regenerator is connected with a filter; the exhaust pipe of the gas catalytic oxidation reactor is connected with the high-temperature flue gas heat exchanger and the low-temperature flue gas heat exchanger in series in sequence and then is connected with the purified flue gas discharge pipe through the heat regenerator, and the exhaust pipe of the heat regenerator is connected with a relay fan; and the high-temperature flue gas heat exchanger and the low-temperature flue gas heat exchanger are provided with a water inlet pipe and a water outlet pipe, and the water outlet pipes of the high-temperature flue gas heat exchanger and the low-temperature flue gas heat exchanger are respectively communicated with a high-temperature hot water supply pipe and a low-temperature hot water supply pipe. In this patent, admit air earlier and preheat the back through the regenerator and then send into the reactor, can slow down reactor entry section temperature decay to the gas flow switching-over cycle of extension reactor reduces motorised valve action number of times, so not only can improve the life of solenoid valve, makes the interior gas flow of reactor more stable moreover. However, the above patent still needs to slow down the temperature decay of the inlet section of the reactor by reversing the gas flow of the reactor, so as to realize the catalytic oxidation of the low-concentration gas.
Disclosure of Invention
The invention aims to provide a coal mine gas regenerative oxidation method aiming at the concentration lower than 30%, which can improve the upper limit of the gas oxidation concentration from 1.2% to 3%, greatly improve the gas oxidation utilization efficiency, and realize the regenerative oxidation of the gas with ultralow concentration in the regenerative oxidation device by adjusting the flow speed of the gas in the regenerative oxidation device without reversing the gas flow in the regenerative oxidation device.
In order to realize the aim, the invention provides a coal mine gas regenerative oxidation method, coal mine gas with the concentration lower than 30 percent is adjusted to the ultralow concentration of 1.2 to 3 percent and is sent into a regenerative oxidation device, the flow rate of the gas in the regenerative oxidation device is adjusted according to the following formula to realize the regenerative oxidation of the ultralow concentration gas,
V ≤ 0.1466 e35.7D·e0.00162T
wherein V is the empty tower flow velocity of the gas in the regenerative oxidation device and the unit m/s; d is the volume percentage of the gas concentration in the regenerative oxidation device, and the value range is 1.2-3%; t is the temperature of the gas in the regenerative oxidation device, and T is more than 0 ℃; e is the natural logarithmic base.
Further, the regenerative thermal oxidation device comprises a shell, and an inert heat storage material and a heat exchanger which are arranged in the shell; the shell is provided with an inlet and an outlet, the inert heat storage material is close to the inlet, and the heat exchanger is close to the outlet; preheating an inert heat storage material to 750-800 ℃, then sending ultralow-concentration gas adjusted to a set value according to a formula into an inlet of a regenerative oxidation device, absorbing heat stored in the inert heat storage material after the ultralow-concentration gas enters the regenerative oxidation device, starting oxidation reaction when the ultralow-concentration gas reaches a light-off temperature, forming an oxidation reaction frontal surface in the inert heat storage material, dividing the inert heat storage material into a preheating area close to the inlet and an oxidation area close to an outlet by the oxidation reaction frontal surface, fully oxidizing the ultralow-concentration gas in the oxidation area, decomposing the gas into carbon dioxide and water, releasing heat, forming high-temperature flue gas, radiating the high-temperature flue gas to the periphery in the oxidation area, utilizing the heat through a heat exchanger, taking the heat returned to the preheating area through heat conduction and heat radiation as heat reflux, and preheating new ultralow-concentration gas in the preheating area through the heat reflux, and the continuous and stable operation of the regenerative oxidation device is maintained.
Furthermore, a starting heating device is arranged on the shell of the regenerative oxidation device, and the starting heating device is positioned between the inlet and the inert heat storage material.
Further, when the gas concentration provided by the gas pipeline is greater than the upper limit of 3%, the flow rate of the gas with the ultralow concentration in the regenerative oxidation device is adjusted through an adjusting valve and a blower; the gas pipeline is connected with a first inlet of the mixer through a regulating valve, the blower is connected with a second inlet of the mixer, and an outlet of the mixer is connected with an inlet of the regenerative thermal oxidation device.
Furthermore, a stop valve is installed on the gas pipeline, and the outlet of the stop valve is connected with the inlet of the regulating valve.
Further, an outlet of the regenerative oxidation device is connected with an induced draft fan.
Further, the outlet of the induced draft fan is connected with a smoke exhaust device.
Further, the inert heat storage material in the reheating oxidation device is foamed ceramic, honeycomb body or stacked ceramic pellets.
Further, a heat insulation layer is arranged between the inert heat storage material and the shell.
The invention has the following beneficial effects:
(1) the safety is improved:
according to the invention, the oxidation of the ultra-low concentration gas is realized by adjusting the flow velocity of the ultra-low concentration gas (1.2-3% of gas) in the regenerative oxidation device, the flow direction of the gas flow in the regenerative oxidation device is unchanged, the flow is stable and free from fluctuation, and the safety of the regenerative oxidation device is improved;
(2) the reliability is improved:
the failure rate of the equipment is obviously reduced without frequently-acting switching valves; the heat storage material is in a steady-state working environment, namely the working temperature changes slowly or basically, the heat stress borne by the heat storage material is obviously reduced, the service life of the material is prolonged, the workload of maintenance is small, and the reliability of the regenerative oxidation device is improved;
(3) the economic efficiency is improved:
by adopting the method provided by the invention, the upper limit of the gas oxidation concentration is improved to 3% from 1.2%, and the gas oxidation utilization efficiency is improved by about 20%; meanwhile, compared with a regenerative oxidation device with the same heat supply capacity, the regenerative oxidation device has the advantages of reduced equipment volume, reduced equipment cost, greatly reduced gas flow rate required to be treated, reduced operation cost and improved economy.
Drawings
FIG. 1 is a schematic structural diagram of a whole regenerative oxidation system employed in the present invention;
FIG. 2 is a schematic diagram of regenerative thermal oxidation.
In the figure: the device comprises a shut-off valve 1, a regulating valve 2, a mixer 3, a blower 4, a shell 5, a heat-insulating layer 6, a starting heating device 7, an inert heat storage material 8, a heat exchanger 9, an induced draft fan 10, a chimney 11, a preheating zone 12, an oxidation reaction front 13, an oxidation zone 14 and heat reflux 15.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment provides a coal mine gas regenerative oxidation method, coal mine gas with the concentration lower than 30% is adjusted to the ultralow concentration of 1.2% -3% and sent into a regenerative oxidation device, the flow rate of the gas in the regenerative oxidation device is adjusted according to the following formula to realize regenerative oxidation of the ultralow concentration gas,
V ≤ 0.1466 e35.7D·e0.00162T
wherein V is the empty tower flow velocity of the gas in the regenerative oxidation device and the unit m/s; d is the volume percentage of the gas concentration in the regenerative oxidation device, and the value range is 1.2-3%; t is the temperature of the gas in the regenerative oxidation device, and T is more than 0 ℃; e is the natural logarithmic base.
In the embodiment, the ultra-low concentration gas refers to coal mine extracted gas with methane concentration of 1.2% -3%, and the gas in the concentration range is lower than the explosion limit concentration, cannot be combusted under natural conditions, and cannot explode. The regenerative oxidation device is a complete set of device which adopts regenerative oxidation technology to oxidize and decompose coal mine gas with the concentration of 1.2-3% into carbon dioxide and water, recovers heat and ensures the operation safety.
Further, the regenerative thermal oxidation apparatus includes a housing 5, and an inert heat storage material 8 and a heat exchanger 9 provided in the housing 5; an inlet and an outlet are arranged on the shell 5, the inert heat storage material 8 is close to the inlet, and the heat exchanger 9 is close to the outlet; preheating an inert heat storage material 8 to 750-800 ℃, feeding ultralow-concentration gas adjusted to a set value according to a formula into an inlet of a regenerative oxidation device, absorbing heat stored in the inert heat storage material 8 after the ultralow-concentration gas enters the regenerative oxidation device to reach a light-off temperature to start an oxidation reaction, forming an oxidation reaction front surface 13 in the inert heat storage material 8, dividing the inert heat storage material 8 into a preheating zone 12 close to the inlet and an oxidation zone 14 close to an outlet by the oxidation reaction front surface 13, fully oxidizing the ultralow-concentration gas in the oxidation zone 14, decomposing the gas into carbon dioxide and water, releasing heat to form high-temperature flue gas, radiating the high-temperature flue gas to the periphery in the oxidation zone 14 in a heat conduction, convection, radiation and other modes, utilizing the heat through a heat exchanger 9, and taking the heat returned to the preheating zone 12 through the heat conduction and the heat radiation as heat backflow 15, the preheating zone 12 preheats new ultra-low concentration gas through the heat reflux 15, and the continuous and stable operation of the regenerative oxidation device is maintained. The core characteristic of the regenerative oxidation is heat backflow 15; the heat reflux 15 is the root cause for reducing the premixed gas oxidation reaction concentration requirements and stabilizing the oxidation.
Further, a starting heating device 7 is mounted on the housing of the regenerative thermal oxidizer, and the starting heating device 7 is located between the inlet and the inert heat storage material 8.
Further, when the gas concentration provided by the gas pipeline is greater than the upper limit of 3%, air is needed for mixing, and the flow rate of the gas with the ultralow concentration in the regenerative oxidation device is adjusted through the adjusting valve 2 and the blower 4; the gas pipeline is connected with a first inlet of the mixer 3 through the regulating valve 2, the blower 4 is connected with a second inlet of the mixer 3, and an outlet of the mixer 3 is connected with an inlet of the regenerative oxidation device.
Furthermore, a stop valve 1 is installed on the gas pipeline, and the outlet of the stop valve 1 is connected with the inlet of the regulating valve 2.
Further, an outlet of the regenerative oxidation device is connected with a draught fan 10.
Further, the outlet of the induced draft fan 10 is connected with a smoke exhaust device, and the embodiment adopts a chimney 11 as the smoke exhaust device.
Further, the inert heat storage material 8 in the regenerative thermal oxidizer is a foamed ceramic, a honeycomb body or stacked ceramic pellets.
Further, a heat insulating layer 6 is provided between the inert heat storage material 8 and the housing 5.
In summary, the whole set of regenerative thermal oxidation system adopted in this embodiment includes a shut-off valve 1, a regulating valve 2, a mixer 3, a blower 4, a housing 5, a heat-insulating layer 6, a start-up heating device 7, an inert heat storage material 8, a heat exchanger 9, an induced draft fan 10, and a chimney 11. The stop valve 1 is used for rapidly cutting off a gas pipeline under emergency conditions, and system safety is guaranteed. The gas supplied from the gas pipeline is adjusted in flow rate by the adjusting valve 2, and is mixed with air from the blower 4 at the mixer 3 to reach the required gas concentration. The gas with the ultralow concentration after the concentration adjustment enters a regenerative oxidation device, is fully oxidized in the inert heat storage material 8 and releases heat; the heat insulation layer 6 reduces the heat dissipation loss of the regenerative oxidation device to the outside; high-temperature flue gas generated by gas oxidation enters a downstream heat exchanger 9 to recover heat, and steam or hot water can be generated; the low-temperature flue gas is discharged into the atmosphere through a draught fan 10 and a chimney 11. The start-up heating means 7 is used to burn fuel oil or gas during the start-up phase to pre-oxidise the inert heat storage material 8 in the apparatus.
When the gas concentration D (volume ratio%), the flow velocity V (m/s) and the gas temperature T (DEG C) in the regenerative oxidation device are changed, the position of the oxidation reaction front surface 13 is changed; the concentration is reduced, the flow rate is increased, the temperature is reduced, and the oxidation reaction front 13 moves downstream; the concentration increases, the flow rate decreases, the temperature increases, and the oxidation reaction front 13 moves upstream. Therefore, the flow rate of the ultra-low concentration gas (1.2-3% of gas) in the regenerative oxidation device is controlled by the formula to ensure that the oxidation reaction front 13 moves within the range of the inert heat storage material 8, so that the regenerative oxidation device is maintained to continuously and stably operate.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A coal mine gas regenerative oxidation method is characterized in that coal mine gas with the concentration lower than 30 percent is adjusted to the ultralow concentration of 1.2 to 3 percent and is sent into a regenerative oxidation device, the flow rate of the gas in the regenerative oxidation device is adjusted according to the following formula to realize the oxidation of the ultralow concentration gas,
V ≤ 0.1466 e35.7D·e0.00162T
wherein V is the empty tower flow velocity of the gas in the regenerative oxidation device and the unit m/s; d is the volume percentage of the gas concentration in the regenerative oxidation device, and the value range is 1.2-3%; t is the temperature of the gas in the regenerative oxidation device, and T is more than 0 ℃; e is a natural constant.
2. The coal mine gas regenerative oxidation method according to claim 1, characterized in that the regenerative oxidation device comprises a housing, and an inert heat storage material and a heat exchanger arranged in the housing;
the shell is provided with an inlet and an outlet, the inert heat storage material is close to the inlet, and the heat exchanger is close to the outlet;
preheating an inert heat storage material to 750-800 ℃, then sending ultralow-concentration gas adjusted to a set value according to a formula into an inlet of a regenerative oxidation device, absorbing heat stored in the inert heat storage material after the ultralow-concentration gas enters the regenerative oxidation device, starting oxidation reaction when the ultralow-concentration gas reaches a light-off temperature, forming an oxidation reaction frontal surface in the inert heat storage material, dividing the inert heat storage material into a preheating area close to the inlet and an oxidation area close to an outlet by the oxidation reaction frontal surface, fully oxidizing the ultralow-concentration gas in the oxidation area, decomposing the gas into carbon dioxide and water, releasing heat, forming high-temperature flue gas, radiating the high-temperature flue gas to the periphery in the oxidation area, utilizing the heat through a heat exchanger, taking the heat returned to the preheating area through heat conduction and heat radiation as heat reflux, and preheating new ultralow-concentration gas in the preheating area through the heat reflux, and the continuous and stable operation of the regenerative oxidation device is maintained.
3. The coal mine gas regenerative oxidation method according to claim 2, wherein a start-up heating device is mounted on a housing of the regenerative oxidation device, and the start-up heating device is located between the inlet and the inert heat storage material.
4. The coal mine gas regenerative oxidation method according to claim 3, characterized in that when the gas concentration provided by the gas pipeline is greater than the upper limit of 3%, the flow rate of the ultra-low concentration gas in the regenerative oxidation device is adjusted by an adjusting valve and a blower;
the gas pipeline is connected with a first inlet of the mixer through a regulating valve, the blower is connected with a second inlet of the mixer, and an outlet of the mixer is connected with an inlet of the regenerative thermal oxidation device.
5. The regenerative coal mine gas oxidation method according to claim 4, wherein a shut-off valve is installed on the gas pipeline, and an outlet of the shut-off valve is connected with an inlet of the regulating valve.
6. The coal mine gas regenerative oxidation method according to claim 5, characterized in that an induced draft fan is connected to an outlet of the regenerative oxidation device.
7. The coal mine gas regenerative oxidation method according to claim 6, characterized in that an outlet of the induced draft fan is connected with a smoke exhaust device.
8. The coal mine gas regenerative oxidation method according to claim 7, wherein the inert heat storage material in the regenerative oxidation device is foamed ceramic, honeycomb or stacked ceramic pellets.
9. The regenerative coal mine gas oxidation method according to claim 8, wherein a heat insulating layer is arranged between the inert heat storage material and the outer shell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110798530.5A CN113375175B (en) | 2021-07-15 | 2021-07-15 | Coal mine gas regenerative oxidation method |
| ZA2022/01774A ZA202201774B (en) | 2021-07-15 | 2022-02-10 | Method for heat reflux oxidation of coal mine gas field of technology |
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| CN202110798530.5A CN113375175B (en) | 2021-07-15 | 2021-07-15 | Coal mine gas regenerative oxidation method |
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| CN113375175B CN113375175B (en) | 2022-08-09 |
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2021
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2022
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| CN113375175B (en) | 2022-08-09 |
| ZA202201774B (en) | 2022-05-25 |
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