CN108905609A - Circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment and method - Google Patents
Circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment and method Download PDFInfo
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- 230000003197 catalytic effect Effects 0.000 title claims abstract description 66
- 239000003245 coal Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000001590 oxidative effect Effects 0.000 title claims abstract description 16
- 239000003054 catalyst Substances 0.000 claims abstract description 18
- 238000004880 explosion Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 162
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000006555 catalytic reaction Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000003546 flue gas Substances 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 229910052593 corundum Inorganic materials 0.000 claims description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 239000002918 waste heat Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 230000009849 deactivation Effects 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 32
- 230000003647 oxidation Effects 0.000 description 17
- 238000007254 oxidation reaction Methods 0.000 description 17
- 238000005516 engineering process Methods 0.000 description 13
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 238000009423 ventilation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 230000002779 inactivation Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000192 social effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
-
- 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
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/702—Hydrocarbons
- B01D2257/7022—Aliphatic hydrocarbons
- B01D2257/7025—Methane
-
- 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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/20—Capture or disposal of greenhouse gases of methane
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment and method, the device includes air distribution system, air distribution system entrance is connected with coal mine gas pipeline and air pipe line respectively, air distribution system outlet is connected with main air blower entrance, main air blower outlet is connected with preheater cold side input port, preheater cold side outlet port is connected with mixer entrance, mixer outlet is connected with valve inlet is automatically cut off, valve outlet is automatically cut off to be connected with catalytic reactor entrance, catalytic reactor outlet is connected with heat taking and exchanging device hot side entrance, heat taking and exchanging device hot side outlet is connected with circulating air splitter inlet, circulating air current divider outlet I is connected with circulating fan entrance, circulating fan outlet is connected with mixer entrance, circulating air current divider outlet II is connected with preheater hot side entrance, preheater hot side outlet is connected with gas exhaust piping；The invention also discloses the working methods of the device；The present invention guarantees that catalytic reactor inlet temperature reaches light-off temperature；Gas flow in reactor is improved, catalyst high temperature deactivation is prevented；Prevent gas explosion.
Description
Technical field
It is administered the invention belongs to coal mine methane and coal mine gas utilizes technical field, and in particular to a kind of circulation of tail gas is explosion-proof
Moulded coal mine gas catalytic oxidation device and method.
Background technique
China is coal mine big country, gas (coal bed gas) resource very abundant.Coal mine gas is generally divided into according to extraction mode
Three kinds：Ground extraction coal bed gas, underground mining coal bed gas and coal mine wind-lack gas.Ground extraction coal seam gas concentration is higher, generally
Pass through defeated utilization outside compression (CNG) or liquefaction (LNG)；Underground some concentration of mining coal bed gas is higher, and gas bearing capacity exists
30% or more, it can be utilized directly as fuel utilization or by purification, but also having greatly is that methane concentration is low
In 30% low concentration gas, it is closer to the gas explosion limit (5-15%), it is explosive and burning can not be stablized, at present still
Without mature utilization technology, utilization rate is very low.In addition, there are also a large amount of concentration in mining area in 0.75% ventilation air gas below, substantially
On be all unprocessed and directly empty, cause the great wasting of resources.In addition, the greenhouse effects of methane are the 21 of carbon dioxide
Times, the discharge of coal mine methane and low concentration gas also greatly exacerbates atmospheric warming effect.Therefore, it develops safe and efficient low
Concentration gas and coal mine methane utilization technology, not only may be implemented the recycling of resource, while mining area greenhouse gas may be implemented
The emission reduction of body has highly important social effect and economic benefit.
The hot counter flow oxidation technology (Thermal that current coal mine methane administering method has MEGTEC company of Sweden to develop
Flow Reversal Reactor, TFRR) and CANMET company of Canada exploitation catalysis counter flow oxidation technology
(Catalytic Flow Reversal Reactor,CFRR).TFRR technology is successively in states such as China, Australia, Britain
Industrial demonstration is carried out, the current whole world there are multiple coal mine methanes using the technology to administer commercialization project.CFRR technology is also located
In technology pilot and demonstration phase, there has been no the projects of commercialized running at present.TFRR and CFRR project all uses adverse current accumulation of heat
To maintain temperature needed for gas oxidation, using adverse current reversing mechanism, to lead to temperature of reactor from the point of view of practical application
Field and air-flow frequent fluctuation, integral honeycomb ceramic catalyst are easy to happen broken blocking, but also there is adverse current and switch automatically
The problems such as controlling extent is more demanding, and high temperature switching valve is easy to appear failure.In addition, Shandong Technology Univ is in the patent declared
A kind of hot gas by after oxidation is proposed in (201110089144.5,201110089163.8,201210281910.2)
To the coal mine methane catalytic oxidizer that entrance idle air is preheated, which effectively overcomes asking for counter flow oxidation technology
Topic.But since the preheating of unstripped gas realizes that heat exchange equipment is huge, heat by carrying out gas-gas heat exchange with high-temperature tail gas completely
Recovery efficiency is lower, and heat loss due to exhaust gas is high, and You waits for improving in Jin mono- Walk.In addition, above-mentioned catalytic oxidation technologies are mainly used for gas
Concentration 0.5~1% section coal mine methane, when gas density be higher than this concentration when, reaction temperature rise to 550 DEG C with
On, lead to catalyst inactivation, has very when big limitation.
Summary of the invention
It is of the existing technology in order to overcome the problems, such as, and expand the gas density range that catalysis oxidation utilizes technology to be applicable in,
The purpose of the present invention is to provide a kind of circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment and methods, on the one hand, passes through
Circulation of tail gas carries out hybrid preheating to unstripped gas, guarantees that catalytic reactor inlet temperature reaches light-off temperature；On the other hand, lead to
Crossing circulation of tail gas mode can be improved gas flow in reactor, and playing reduces reactor bottom temperature, prevent catalyst high temperature
The effect of inactivation.In addition, entrance gas density can be reduced to safety dense by setting recycle ratio (circulating air/unstripped gas)
Range is spent, gas explosion is prevented.
In order to achieve the above object, the present invention adopts the following technical scheme that：
A kind of circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment, including air distribution system 1,1 entrance of air distribution system point
Be not connected with coal mine gas pipeline and air pipe line, air distribution system 1 outlet is connected with 2 entrance of main air blower, main air blower 2 outlet and in advance
Hot 3 cold side input port of device is connected, and 3 cold side outlet port of preheater is connected with 4 entrance of mixer, and the outlet of mixer 4 enters with automatic stop valve 5
Mouth is connected, and the outlet of automatic stop valve 5 is connected with 6 entrance of catalytic reactor, the outlet of catalytic reactor 6 and 7 hot side of heat taking and exchanging device
Entrance is connected, and 7 hot side outlet of heat taking and exchanging device is connected with 8 entrance of circulating air current divider, and circulating air current divider 8 exports I and circulation
9 entrance of blower is connected, and the outlet of circulating fan 9 is connected with 4 entrance of mixer, and circulating air current divider 8 exports II and 3 hot side of preheater
Entrance is connected, and 4 hot side outlet of preheater is connected with gas exhaust piping.
Air distribution system 1：For configuring unstripped gas, coal mine gas and air are mixed according to a certain percentage, it is dense to obtain gas
Degree is the reactor feed gas not higher than 9%, this concentration is according to CH4/O2What stoichiometric ratio determined；When former coal mine gas is dense
When degree is lower than 9%, then air is not passed through.
Main air blower 2：For overcoming the pressure drop of gas passage.
Preheater 3：For recycling the waste heat of exhaust, inlet air flow is preheated, design delivery temperature is 100~150
℃。
Mixer 4：For reaction raw material gas and circulating air.
Automatic stop valve 5：Air-flow is automatically cut off when mixer 4 exports when gas density is higher than 2%, prevents reactor Neva
The generation of this explosion.
Catalytic reactor 6：Using heat insulation-type fixed bed reactors, catalyst uses integral honeycomb type or graininess Pd/
Al2O3Catalyst；Electrically heated rod is arranged in catalyst bed, heating when for system starting, reactor design operation temperature section
It is 300~550 DEG C, temperature alarming is arranged lower than 300 DEG C or when outlet is higher than 550 DEG C in entrance.
Heat taking and exchanging device 7：The high-temperature flue gas heat that catalytic reactor 6 is discharged is recycled, available steam is generated；It changes
Flue gas design temperature after heat is 350~400 DEG C.
Circulating air current divider 8：For bypassing circulation gas and exhaust.
Circulating fan 9：Using frequency conversion fan, frequency and 6 inlet temperature of catalytic reactor link；When catalytic reactor 6 enters
When mouth temperature is lower than 300 DEG C, then 9 internal circulating load of circulating fan is increased, 6 gasinlet temperature of catalytic reactor is maintained to be higher than 300 DEG C.
The working method of the circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment, coal mine gas and air are by matching
Gas system 1 is configured to the reactor feed gas that gas density is not higher than 9%, and reactor feed gas boosts by main air blower 2, into preheating
Device 3 into mixer 4, flows through automatic stop valve 5 with circulating air mixed diluting and after heating up, into catalysis after exhaust gas heat exchanging
Reactor 6, during flowing through 6 catalyst bed of catalytic reactor, the CH in air-flow4And O2In Pd/Al2O3The work of catalyst
Under, reaction generates CO2And H2O, and release heat；The high-temperature flue gas that catalytic reactor 6 is discharged enters heat taking and exchanging device 7, will take
The heat of band is converted into the high-temperature steam with industrial utility value by heat exchange, and the circulating air after cooling that exchanges heat is by circulation point
After flowing the shunting of device 8, a part enters mixer 4 by the boosting of circulating fan 9 and mixes with the reactor feed gas from preheater 3,
Another part is discharged into atmosphere after preheater 3 recycles heat.
The present invention carries out oxidation to coal mine gas (containing coal mine methane) using catalytic oxidation technique and takes heat utilization, utilizes circulation
Blower recycles catalytic reactor exhaust, by adjusting circulating air temperature and recycle ratio, control catalytic reactor inlet and outlet
Temperature guarantees that gasinlet temperature reaches catalysis light-off temperature, while preventing catalytic reactor bottom overtemperature and leading to catalyst
Inactivation.Meanwhile by circulating air dilute entrance reactor feed gas, entrance gas density is reduced to explosible limit concentration hereinafter,
Prevent gas explosion.
Technique of the present invention has the characteristics that：
1) it is suitable for the coal mine gas of all concentration, particular for 30% low concentration gas below (containing coal mine methane),
It is wider than traditional ventilation air methane oxidation processing technique (TFRR and CFRR) application range；
2) it is provided with tail gas heat quantity recyclable device (preheater 3), for preheating to unstripped gas；
3) it is provided with exhaust gas circulation system, by mixing high-temperature tail gas and unstripped gas, reactor inlet temperature is maintained to be higher than
300 DEG C of light-off temperature of catalysis reaction.
4) it is provided with exhaust gas circulation system, utilization tail gas not gassy dilutes unstripped gas, will enter the gas of reactor
Concentration is reduced to 2% hereinafter, on the one hand playing explosion-proof, and on the other hand control reactor bed temperature rise is not higher than 550 DEG C, prevents
Only catalyst high temperature deactivation.
5) it is provided with automatic stop valve 5, air-flow is automatically cut off when mixer 4 exports when gas density is higher than 2%, plays anti-
Quick-fried effect；
6) it is provided with heat taking and exchanging device 7, the heat that coal mine gas catalysis oxidation is released can be subjected to steam trans-utilization.
Detailed description of the invention
Fig. 1 is circulation of tail gas explosion-proof type coal mine gas catalytic oxidation technique schematic diagram of the present invention.
Figure of description is used to provide further understanding of the present invention, and constitutes a part of the invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.
Specific embodiment
Of the invention to clearly illustrate, below with reference to examples and drawings, the present invention will be described in further detail.Ability
Field technique personnel understand, following the description is not limiting the scope of the invention, it is any make on the basis of the present invention change
Into and variation, all within protection scope of the present invention.
The specific embodiment of circulation of tail gas explosion-proof type coal mine gas catalysed oxidation processes of the present invention is as follows：
Embodiment (one)：The case where coal mine gas concentration is higher than 9%, (with gas density for 20%, flow was 100,000 mark sides
For).
System starting：1 entrance coal mine gas pipeline of air distribution system is closed, air pipe line is opened, starts main air blower 2, air
Through air distribution system 1 enter main air blower 2, successively flowed through after pressurization preheater 3, mixer 4, automatic stop valve 5, catalytic reactor 6,
Heat taking and exchanging device 7 and current divider 8, preheated device 3 are discharged；Start circulating fan 9, starts heating rod built in catalytic reactor 6, it will
Bed temperature heats and maintains 300 DEG C.
Ventilation operation：Heating rod built in catalytic reactor 6 is closed, 1 entrance coal mine gas pipeline of air distribution system is opened, by coal
Mine gas and air are according to 1：1.225 ratio is mixed in air distribution system 1, is configured to the reactor feed gas of 9% concentration.
Reactor feed gas is pressurized through main air blower 2, flows through preheater 3 and mixer 4.9 recycle ratio of circulating fan is set as 10：1, with circulation
The mixed gas temperature of tail gas is 302 DEG C, gas density 0.82%.Mixed airflow is anti-into catalysis through automatic stop valve 5
Device 6 is answered, catalytic oxidation occurs when flowing through catalyst bed, methane is fully converted to CO2And H2O, while releasing heat.It urges
Change the outlet of reactor 6 exhaust temperature and rise to 498 DEG C, 310 DEG C is down to after the heat exchange of heat taking and exchanging device 7, then through circulating air point
Stream device 8 is split into two-way.The preheated device 3 of first via tail gas stream carries out tail gas heat quantity recycling, and temperature is down to 120 DEG C of discharge systems,
Reactor feed gas temperature is preheated to 220 DEG C by room temperature；Second road tail gas is followed in catalytic reactor 6 by circulating fan 9
Ring dilutes and heats reactor feed gas.The first via and the ratio of the second road tail gas are 1:10.Heat taking and exchanging device 7 takes thermic load
For 191MW, the thermal efficiency 96%.
Embodiment (two)：The case where coal mine gas concentration is lower than 9%, (with gas density for 5%, flow was that 100,000 mark sides are
Example).
System starting：1 entrance coal mine gas pipeline of air distribution system is closed, air pipe line is opened, starts main air blower 2, air
Through air distribution system 1 enter main air blower 2, successively flowed through after pressurization preheater 3, mixer 4, automatic stop valve 5, catalytic reactor 6,
Heat taking and exchanging device 7 and current divider 8, preheated device 3 are discharged；Start circulating fan 9, starts heating rod built in catalytic reactor 6, it will
Bed temperature heats and maintains 300 DEG C.
Ventilation operation：Heating rod built in catalytic reactor 6 is closed, 1 entrance coal mine gas pipeline of air distribution system is opened, is closed
Air pipe line.Reactor feed gas is pressurized through main air blower 2, flows through preheater 3 and mixer 4.9 recycle ratio of circulating fan is set as 5：
1, it is 300 DEG C with the mixed gas temperature of recycled offgas, gas density 0.83%.Mixed airflow through automatic stop valve 5, into
Enter catalytic reactor 6, catalytic oxidation occurs when flowing through catalyst bed, methane is fully converted to CO2And H2O is released simultaneously
Heat.Catalytic reactor outlet exhaust temperature rises to 505 DEG C, 315 DEG C is down to after the heat exchange of heat taking and exchanging device 7, then through following
Ring gas current divider 8 is split into two-way.The preheated device 3 of first via tail gas stream carries out tail gas heat quantity recycling, and temperature is down to 120 DEG C of discharges
System, reactor feed gas temperature are preheated to 225 DEG C by room temperature；Second road tail gas by circulating fan 9 in catalytic reactor 6 into
Row circulation, dilutes and heats reactor feed gas.The first via and the ratio of the second road tail gas are 1:5.Heat taking and exchanging device 7 takes heat negative
Lotus is 46MW, the thermal efficiency 92.5%.
Embodiment (three)：The case where coal mine gas is coal mine methane, (with gas density for 0.5%, flow is 100,000 mark sides
For).
System starting：1 entrance coal mine gas pipeline of air distribution system is closed, air pipe line is opened, starts main air blower 2, air
Through air distribution system 1 enter main air blower 2, successively flowed through after pressurization preheater 3, mixer 4, automatic stop valve 5, catalytic reactor 6,
Heat taking and exchanging device 7 and current divider 8, preheated device 3 are discharged；Start circulating fan 9, starts heating rod built in catalytic reactor 6, it will
Bed temperature heats and maintains 300 DEG C.
Ventilation operation：Heating rod built in catalytic reactor 6 is closed, 1 entrance coal mine gas pipeline of air distribution system is opened, is closed
Air pipe line.Reactor feed gas is pressurized through main air blower 2, flows through preheater 3 and mixer 4.9 recycle ratio of circulating fan is set as 1：
1, it is 305 DEG C with the mixed gas temperature of recycled offgas, gas density 0.25%.Mixed airflow through automatic stop valve 5, into
Enter catalytic reactor 6, catalytic oxidation occurs when flowing through catalyst bed, methane is fully converted to CO2And H2O is released simultaneously
Heat.Catalytic reactor 6 exports exhaust temperature and rises to 370 DEG C, 350 DEG C is down to after the heat exchange of heat taking and exchanging device 7, then through following
Ring gas current divider 8 is split into two-way.The preheated device 3 of first via tail gas stream carries out tail gas heat quantity recycling, and temperature is down to 120 DEG C of discharges
System, reactor feed gas temperature are preheated to 260 DEG C by room temperature；Second road tail gas by circulating fan 9 in catalytic reactor 6 into
Row circulation, dilutes and heats unstripped gas.The first via and the ratio of the second road tail gas are 1:1.The thermic load that takes of heat taking and exchanging device is
1.53MW, the thermal efficiency 31%.
Claims (10)
1. a kind of circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment, it is characterised in that：Including air distribution system (1), distribution
System (1) entrance is connected with coal mine gas pipeline and air pipe line respectively, air distribution system (1) outlet and main air blower (2) entrance phase
Even, main air blower (2) outlet is connected with preheater (3) cold side input port, and preheater (3) cold side outlet port is connected with mixer (4) entrance,
Mixer (4) outlet is connected with automatic stop valve (5) entrance, automatic stop valve (5) outlet and catalytic reactor (6) entrance phase
Even, catalytic reactor (6) outlet is connected with heat taking and exchanging device (7) hot side entrance, heat taking and exchanging device (7) hot side outlet and circulating air
Current divider (8 entrances be connected, circulating air current divider (8) outlet I be connected with circulating fan (9) entrance, circulating fan (9) export and
Mixer (4) entrance is connected, and circulating air current divider (8) outlet II is connected with preheater (3) hot side entrance, preheater (4) hot side
Outlet is connected with gas exhaust piping.
2. a kind of circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment according to claim 1, it is characterised in that：Institute
Air distribution system (1) is stated for configuring unstripped gas, coal mine gas and air are mixed according to a certain percentage, obtaining gas density is not
Reactor feed gas higher than 9%, this concentration are according to CH4/O2What stoichiometric ratio determined；When former coal mine gas concentration is lower than
When 9%, then air is not passed through；The main air blower (2) is used to overcome the pressure drop of gas passage.
3. a kind of circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment according to claim 1, it is characterised in that：Institute
Preheater (3) are stated for recycling the waste heat of exhaust, inlet air flow are preheated, design delivery temperature is 100~150 DEG C.
4. a kind of circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment according to claim 1, it is characterised in that：Institute
Mixer (4) are stated for reaction raw material gas and circulating air.
5. a kind of circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment according to claim 1, it is characterised in that：Institute
State automatic stop valve (5)：Air-flow is automatically cut off when gas density is higher than 2% when mixer (4) outlet, prevents gas in reactor
The generation of explosion.
6. a kind of circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment according to claim 1, it is characterised in that：Institute
Catalytic reactor (6) are stated using heat insulation-type fixed bed reactors, catalyst uses integral honeycomb type or graininess Pd/Al2O3Catalysis
Agent；Catalyst bed be arranged electrically heated rod, for system starting when heating, reactor design operation temperature section be 300~
550 DEG C, temperature alarming is arranged lower than 300 DEG C or when outlet is higher than 550 DEG C in entrance.
7. a kind of circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment according to claim 1, it is characterised in that：Institute
It states heat taking and exchanging device (7) and recycles the high-temperature flue gas heat that catalytic reactor 6 is discharged, generate available steam；After heat exchange
Flue gas design temperature be 350~400 DEG C.
8. a kind of circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment according to claim 1, it is characterised in that：Institute
Circulating air current divider (8) are stated for bypassing circulation gas and exhaust.
9. a kind of circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment according to claim 1, it is characterised in that：Institute
Circulating fan (9) are stated to link using frequency conversion fan, frequency and 6 inlet temperature of catalytic reactor；When catalytic reactor (6) entrance temperature
When degree is lower than 300 DEG C, then circulating fan (9) internal circulating load is increased, catalytic reactor (6) gasinlet temperature is maintained to be higher than 300 DEG C.
10. the working method of circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment, feature described in claim 1 to 9
It is：Coal mine gas and air are configured to the reactor feed gas that gas density is not higher than 9% by air distribution system (1), and reaction is former
Gas is expected by main air blower (2) boosting, into preheater (3), after exhaust gas heat exchanging, is mixed into mixer (4) with circulating air dilute
It releases and is flowed through after heating up automatic stop valve (5), into catalytic reactor (6), flow through the mistake of catalytic reactor (6) catalyst bed
Cheng Zhong, the CH in air-flow4And O2In Pd/Al2O3Under the action of catalyst, reaction generates CO2And H2O, and release heat；Catalysis is anti-
The high-temperature flue gas for answering device (6) to be discharged enters heat taking and exchanging device (7), and the heat of carrying is converted by heat exchange with industrial utilization
The high-temperature steam of value exchanges heat circulating air after cooling after circulation current divider (8) shunts, and a part passes through circulating fan
(9) boosting enters mixer (4) and mixes with the reactor feed gas from preheater (3), and another part is recycled by preheater (3)
Atmosphere is discharged into after heat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810855732.7A CN108905609A (en) | 2018-07-31 | 2018-07-31 | Circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810855732.7A CN108905609A (en) | 2018-07-31 | 2018-07-31 | Circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108905609A true CN108905609A (en) | 2018-11-30 |
Family
ID=64393196
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810855732.7A Pending CN108905609A (en) | 2018-07-31 | 2018-07-31 | Circulation of tail gas explosion-proof type coal mine gas catalytic oxidizing equipment and method |
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| Country | Link |
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| CN (1) | CN108905609A (en) |
Cited By (2)
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| CN109973141A (en) * | 2019-04-22 | 2019-07-05 | 山西文龙中美环能科技股份有限公司 | Super low-concentration gas dual oxide heating system |
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