CN106433804A - Trapping method and trapping system for tar in coal gas - Google Patents
Trapping method and trapping system for tar in coal gas Download PDFInfo
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- CN106433804A CN106433804A CN201610919126.8A CN201610919126A CN106433804A CN 106433804 A CN106433804 A CN 106433804A CN 201610919126 A CN201610919126 A CN 201610919126A CN 106433804 A CN106433804 A CN 106433804A
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
- C10J3/82—Gas withdrawal means
- C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/08—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
-
- 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
- B01D53/002—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 by condensation
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a trapping method for tar in coal gas. The trapping method comprises steps as follows: gas-gas heat exchange: low-temperature gas exchanges heat with high-temperature coal gas, heat of the high-temperature gas is recovered, and the use amount of spray tar is reduced; trapping: low-temperature tar is sprayed on the high-temperature coal gas subjected to heat exchange, so that tar gas in the coal gas is condensed, separated out and recovered through trapping; defogging: tar fog drops about to escape are recovered gradually by use of a two-stage defogger. With the adoption of the tar trapping method, tar can be removed from the coal gas repeatedly, that is, the better tar recovery effect is realized in a tar washing manner. Compared with an existing technology for trapping tar through washing, firstly, the tar trapping method cannot produce a large amount of refractory wastewater, so that the investment, production and operation costs of wastewater treatment equipment are reduced; secondly, the trapping rate is high and secondary investment of an electrical tar precipitator is reduced. Besides, the invention further provides a trapping system for the tar in the coal gas.
Description
Technical field
The present invention relates to coal industry technical field, the more particularly to a kind of coal-tar middle oil capture method of coal gas, trapping system.
Background technology
The raw gas for producing during mobile bed coal-gasification, coal carbonization and pyrolysis raw coke oven gas (hereinafter collectively referred to as coal
Gas) a small amount of coal tar is usually contained, needed first to reclaim the tar in coal gas before lower procedure is entered.
At present, the coal-tar middle oil removal process of coal gas generally using washing method to wash, low temperature, after cooling containing oil wash
Wash water and carry out oil-water separation and coal tar is obtained, the washess of periodic exhaustion send sewage-treatment plant after phenol, recovery ammonia.So
And, this tar recovery process often produces substantial amounts of difficult phenol, ammonia waste water, cause wastewater treatment equipment equipment investment and
Production run is relatively costly.
In view of this, it would be highly desirable to which the recovery method for existing tar is optimized design, on the basis for ensureing deoiling effect
On, it is to avoid intractable waste water is produced, and reduces investment and the production cost of sewage treatment equipment.
Content of the invention
The purpose of the present invention is to provide a kind of coal gas coal-tar middle oil capture method, both can guarantee that deoiling effect, and had been avoided that again
Intractable waste water is produced, so as to reduce investment and the production cost of sewage treatment equipment.On this basis, the present invention's is another
Purpose is for providing corresponding gas tar trapping system.
For solving above-mentioned technical problem, the present invention provides a kind of coal gas coal-tar middle oil capture method, comprises the steps：
Gas-gas heat exchange step, carries out heat exchange using cryogenic gas and coal gas of high temperature, reclaims coal gas of high temperature heat, reduces spray
Drench Tar use amount；
Trapping step, is sprayed from the coal gas of high temperature after low temperature tar heat exchanging, makes the tar gas in coal gas cold
Condensation goes out and is captured recovery；
Demisting step, progressively reclaims the tar droplet that will escape using two-stage demister.
Using this tar capture method, oil removing repeatedly can be carried out to coal gas and (is reached by way of oil wash preferably
Tar recovering effect), compared with prior art, during the trapping of above-mentioned tar will not the waste water of process in distress produce, so as to
Reduce sewage treatment equipment investment and production run cost.
Preferably, the trapping step is specially：
Structured packing, filtering baffle are set, and using low temperature tar, coal gas are sprayed twice；Coal gas is made to first pass through institute
State filtering baffle, contact with the low temperature tar reverse flow for spraying first again, then by the structured packing, while with secondary
The low temperature tar reverse flow contact of spray.
Preferably, the demisting step is specially：
Rotational flow plate defroster, mesh mist eliminator or deflection plate demister are set, make to lead to through the coal gas for trapping step successively
Cross the rotational flow plate defroster, the mesh mist eliminator or deflection plate demister.
Preferably, the cryogenic gas used in the gas-gas heat exchange step is for coal gas through the gas-gas heat exchange step, institute
The low temperature coal gas for being formed after stating trapping step and the demisting step.
Preferably, the tar that the gas-gas heat exchange step, the trapping step, the demisting step are trapped is reclaimed,
After cooling, a part sends storage outside, and another part is used for the low temperature tar of the trapping step.
Preferably, the tar temperature that control is reclaimed is between 140 DEG C, 190 DEG C, and controls the temperature of the spray tar
Between 70 DEG C, 110 DEG C.
The present invention also provides a kind of coal gas coal-tar middle oil trapping system, including quenching column, the quenching column from top to bottom according to
Secondary setting：
Accommodating area, for housing the tar in the coal gas for reclaiming；
Air inlet pipe, for being input into coal gas of high temperature；
Gas distributor, the correspondence position after the air inlet pipe；
Gas-gas heat exchanger, is provided with cryogenic gas passage separately, coal gas of high temperature passage；
Trapping area, is provided with filtering baffle, structured packing and multiple nozzles for spraying low temperature tar, for burnt in coal gas
The trapping of oil gas body is reclaimed；
Escape pipe, for low temperature coal gas of the output after oil removing.
It is high temperature, contains the coal gas of tar, in work process, the coal gas passes through air inlet pipe through the coal gas of preamble dust removal step
Enter inside quenching column, start to flow up, carried out by the cryogenic gas in gas-gas heat exchanger, with cryogenic gas passage first
Heat exchange, cryogenic gas is heated and has reclaimed heat, improves the utilization ratio of heat, while coal gas of high temperature is tentatively lowered the temperature,
And coal gas of high temperature heat is reclaimed, reduce spray Tar use amount.Coal gas continues up flowing, the low temperature tar with trapping area spray
Inversely it is fully contacted, temperature reduces further, tar gas condensation which includes, accommodating area is dropped to, and after oil removing
Coal gas is further up, goes out quenching column from escape pipe.
As can be seen here, using this tar trapping system, oil removing repeatedly can be carried out i.e. by way of oil wash to coal gas
Preferable tar recovering effect is reached, compared with prior art, first, a large amount of difficulty will not be produced during the trapping of above-mentioned tar
The waste water of reason is so as to reduce sewage treatment equipment investment and production run cost.Second, capture rate is high, electrical tar precipitator is reduced
The second investment.
Preferably, the trapping area includes from top to bottom successively：
Filtering baffle, for removing the dust that carries secretly in the coal gas of high temperature after heat exchange；
First jet, is connected with low temperature tar input pipe, for spraying low temperature tar first；
Structured packing, is fully contacted the low temperature tar of spray and coal gas of high temperature；
Second nozzle, is connected with low temperature tar input pipe, for secondary spraying low temperature tar.
Preferably, the quenching column is additionally provided with demister between the trapping area, the escape pipe.
Preferably, the demister includes rotational flow plate defroster, mesh mist eliminator or deflection plate demister from top to bottom.
Preferably, the entrance of the cryogenic gas passage of the low temperature coal gas passage of the gas-gas heat exchanger is connected with the escape pipe
Connect, export and be connected with aftertreatment systems.
Preferably, tar delivery pump and tar cooler, the accommodating area, the tar delivery pump, Jiao are also included
Oil cooler is linked in sequence, and the other end of the tar cooler is all connected with the trapping area, tar tank.
Preferably, the quenching column is provided with dilution, rinses oil burner nozzle in the top of demister.
Description of the drawings
Fig. 1 is a kind of FB(flow block) of specific embodiment of the coal-tar middle oil capture method of coal gas provided by the present invention；
Fig. 2 is a kind of structural representation of specific embodiment of the coal-tar middle oil trapping system of coal gas provided by the present invention.
In Fig. 2：
Quenching column 1；
Accommodating area 11；
Air inlet pipe 12；
Gas-gas heat exchanger 13；Cryogenic gas passage 131；Gas passage 132；
Trapping area 14；First jet 141；Structured packing 142；Second nozzle 143；
Escape pipe 15；
Demister 16；Rotational flow plate defroster 161；Mesh mist eliminator or deflection plate demister 162；
Tar delivery pump 20；
Tar cooler 17；
Gas distributor 18；
Dilution, flushing oil burner nozzle 19.
Specific embodiment
The core of the present invention is to provide a kind of coal gas coal-tar middle oil capture method, both can guarantee that deoiling effect, and reduced electricity
The investment of tar device is caught, is avoided that the generation of intractable waste water again, so as to reduce sewage treatment equipment investment and production cost.
On this basis, another core of the present invention is for providing a kind of corresponding gas tar trapping system.
In order that those skilled in the art more fully understands technical scheme, below in conjunction with the accompanying drawings and concrete real
The present invention is described in further detail to apply example.
It should be noted that the noun of locality " upper and lower " herein is all set up on the basis of Figure of description, they
Appearance protection scope of the present invention should not be construed as limiting.
Refer to a kind of stream of specific embodiment that Fig. 1, Fig. 1 are the coal-tar middle oil capture method of coal gas provided by the present invention
Journey block diagram.
In a kind of specific embodiment, the present invention provides a kind of coal gas coal-tar middle oil capture method, comprises the steps：
S11：Gas-gas heat exchange step, carries out heat exchange using cryogenic gas and coal gas of high temperature, reclaims coal gas of high temperature heat, subtracts
Tar use amount is sprayed less；
S12：Trapping step, is sprayed from the coal gas of high temperature after low temperature tar heat exchanging, is made the tar gas in coal gas
Body condensation the recovery that is captured.
Using this tar capture method, repeatedly oil removing can be carried out to coal gas, i.e., be reached by way of oil wash preferably
Tar recovering effect, reach preferable clean-up effect, compared with prior art, during the trapping of above-mentioned tar, difficulty will not be produced
The waste water of process, so as to reduce sewage treatment equipment investment and production cost.
In specific scheme, above-mentioned trapping step can be specially：
Structured packing, filtering baffle are set, and using low temperature tar, coal gas are sprayed twice；Coal gas is made to first pass through institute
State filtering baffle, contact with the low temperature tar reverse flow for spraying first again, then by the structured packing, while regular
Contact with the low temperature tar reverse flow of secondary spraying on filler.
Using above-mentioned trapping step, while coal gas is with the low temperature tar contact heat-exchanging for spraying first, the coal for wherein including
The solid matter impingement baffles such as powder, coke powder, is separated with coal gas, is prevented coal gas from blocking filler when entering structured packing, is extended regular
The use time of filler.The coal gas is again through structured packing, and the tar gas which contains are abundant with the low temperature tar of secondary spraying
Contact is further separated out by total condensation substantially.
The structure of above-mentioned baffle plate can have varied, such as chev(e)ron baffle shown in Fig. 2, it is also possible to be set to plane gear
Plate, or curved baffle etc..
As can be seen here, said method repeatedly, thoroughly can carry out oil removing to coal gas, further enhance tar trapping and reclaim
Effect.
Additionally, the capture method of above-mentioned coal gas can also include S13：Demisting step：Demister is set, is made through trapping
The coal gas of step passes through demister.
Specifically, demisting step is specially：Rotational flow plate defroster, mesh mist eliminator be set, or deflection plate demister, make through
The coal gas for crossing trapping step passes sequentially through rotational flow plate defroster, mesh mist eliminator or deflection plate demister.
In this way, rotational flow plate defroster filters out the larger droplet of particle diameter in coal gas, mesh mist eliminator or baffling
Plate demister filters out the less droplet of particle diameter in coal gas further, can trap the mist state tar that carries secretly in coal gas completely,
Increase the yield of tar, can guarantee that the gas quality for entering follow-up system meets the requirements again.
It is contemplated that above-mentioned demister is not limited in the structure of two-layer demisting, other structures can also be adopted, also may be used
To adopt monolayer demisting, or the structure of three layers of demisting.
In another kind of specific embodiment, the cryogenic gas used in gas-gas heat exchange step is coal gas through gas-gas heat exchange
The low temperature coal gas for being formed after step, trapping step and demisting step.
So, system after the cryogenic gas is entered back into after heat-exchange temperature rising, improves energy utilization efficiency；Simultaneously
Coal gas of high temperature is tentatively lowered the temperature, its internal part coal tar gas condensation, has reached the purpose that kills two birds with one stone.
In another specific embodiment, the tar that gas-gas heat exchange step, trapping step, demisting step can be trapped
After recovery, cooling, a part sends storage outside, low temperature tar of the another part as trapping step.
Similarly, this scheme achieves recycling for tar, has equally saved the cost of gas purification.
In another kind of specific embodiment, in above-mentioned capture method, by control reclaim tar temperature between 140 DEG C, 190
Between DEG C, and control the temperature of spray tar between 70 DEG C, 110 DEG C.
Using above-mentioned control temperature foundation be the temperature of low temperature coal gas after requirement cooling oil removing higher than its dew point temperature,
To reach the purpose for separating out in the low temperature coal gas of quenching column 1 without moisture.
Refer to a kind of knot of specific embodiment that Fig. 2, Fig. 2 are the coal-tar middle oil trapping system of coal gas provided by the present invention
Structure schematic diagram.
In a kind of specific embodiment, as shown in Fig. 2 the present invention provides a kind of coal gas coal-tar middle oil trapping system, bag
Quenching column 1 is included, quenching column 1 is set gradually from top to bottom：
Accommodating area 11, for the tar in gas recovery；
Air inlet pipe 12, for being input into coal gas；
Gas distributor 18, the correspondence position after the air inlet pipe 12；
Gas-gas heat exchanger 13, is provided with cryogenic gas passage 131 separately, gas passage 132；
Trapping area 14, is provided with multiple nozzles for spraying low temperature tar；
Escape pipe 15, for the low temperature coal gas that output coal gas are formed after oil removing.
It is high temperature, contains the coal gas of tar, in work process, the coal gas is entered by air inlet pipe 12 through the coal gas of previous step
Enter the gas distributor 18 inside quenching column 1 so that coal gas is uniformly distributed in the cross section of quenching column 1, it is to avoid occur follow-up
Gas short circuit or the phenomenon of heat exchange inequality.Then the coal gas starts to flow up, and passes through gas-gas heat exchanger 13 first, with low temperature gas
Low temperature gas in body passage carries out heat exchange, and cryogenic gas is heated and has reclaimed heat, improves the utilization ratio of heat, while
Coal gas of high temperature is tentatively lowered the temperature, its internal part coal tar gas condensation, pool droplet-like backward under drop to appearance
Put area 11.Coal gas continues up flowing, is inversely fully contacted with the low temperature tar of trapping area 14 ejection, and temperature reduces further,
The further condensation of tar gas which includes, accommodating area 11 is dropped to, and the coal gas after oil removing is further up, from giving vent to anger
Pipe 15 flows out quenching column 1.
As can be seen here, using this tar trapping system, oil removing repeatedly can be carried out (i.e. by way of oil wash to coal gas
Reach preferable tar recovering effect), compared with prior art, will not produce during above-mentioned tar trapping intractable in a large number
The pollutant such as waste water, so as to reduce the cost of coal gas processing.
In specific scheme, above-mentioned trapping area 14 includes from top to bottom successively：
Filtering baffle, for removing the dust that carries secretly in the coal gas of high temperature after heat exchange；
First jet 141, is connected with low temperature tar input pipe, for spraying low temperature tar first；
Structured packing 142, setting can catch, the dry load of the tar for absorbing in coal gas, make the low temperature tar of spray
It is fully contacted with coal gas of high temperature；
Second nozzle 143, is connected with low temperature tar input pipe, for secondary spraying low temperature tar.
Using this structure, the coal gas for having separated out part tar through gas-gas heat exchange is continued up, and is wherein included
Coal dust, the solid matter such as coke powder clash into filtering baffle, separate with coal gas, prevent from being brought in structured packing 142 by coal gas and block
Filler, extends the use time of structured packing.Then, coal gas continues upward through structured packing 142, coal gas in structured packing
Heat exchange is fully contacted with the low temperature tar of secondary spraying, the tar gas in coal gas are condensed precipitation further, are converged into drop and are fallen
To the accommodating area of Quench tower bottom, that is, the trapping for completing tar is reclaimed.
As can be seen here, trapping area 14 repeatedly, more thoroughly carries out oil removing to coal gas by the way of oil wash, further enhances
The effect of tar is reclaimed in trapping.
The structure of above-mentioned baffle plate can have varied, such as chev(e)ron baffle shown in Fig. 2, it is also possible to be set to plane gear
Plate, or curved baffle etc..
Further in scheme, above-mentioned quenching column 1 is additionally provided with demister 16 between trapping area 14, escape pipe 15.
In specific scheme, demister 16 includes rotational flow plate defroster 161, mesh mist eliminator or deflection plate from top to bottom
Demister 162.
Using this structure, rotational flow plate defroster 161 filters out the larger droplet of particle diameter in coal gas, mesh mist eliminator or folding
Stream plate demister 162 filters out the less droplet of particle diameter in coal gas further, can trap the mist shape tar in coal gas completely,
Increase the yield of tar, can guarantee that the gas quality for entering follow-up system meets the requirements again.
It is contemplated that above-mentioned demister 16 is not limited in the structure of two-layer demisting, other structures can also be adopted,
Monolayer demisting, or the structure of three layers of demisting can be adopted.
In another kind of specific embodiment, the entrance of the cryogenic gas passage 131 of above-mentioned gas-gas heat exchanger 13 and escape pipe
15 connections, outlet are connected with aftertreatment systems.
Gas temperature after oil removing is relatively free of the gas temperature before oil removing and has substantially reduced, using this structure, low
The cryogenic gas passage that warm coal gas flows to gas-gas heat exchanger 13 from after the outflow of escape pipe 15, carry out with coal gas of high temperature before oil removing
Heat exchange, one side cryogenic gas enters back into rear system after raising, improves energy utilization efficiency through heat exchange, temperature；Another
Aspect, coal gas of high temperature is tentatively lowered the temperature, and its internal part coal tar gas is condensed precipitation, has reached the mesh for killing two birds with one stone
's.
In another kind of specific embodiment, above-mentioned tar trapping system also includes tar delivery pump 20 and tar cooler
17, the accommodating area 11, the tar delivery pump 20, the tar cooler 17 are linked in sequence, the tar cooler another
One end is all connected with trapping area 14, tar tank.
So, the tar being recovered in accommodating area 11 reduces through 17 temperature of tar cooler after being pressurizeed by pump, a part
Come back to trapping area 14 to spray as low temperature tar, a part enters follow-up system as raw materials for production and carries out deep processing.
Further in scheme, the quenching column 1 is provided with dilution, rinses oil burner nozzle (19) in the top of demister.
As coal tar oil nature is unstable, solid impurity content is higher, easy coking, blocking pipeline and tower internals, make system
Pressure drop is sharply increased.Additionally, demister is after used a period of time, the tar droplet in flue gas can be intercepted at demister
On, cause demister to be easily blocked or fouling, the flowing of low flue gas so, in sweetening process, can be affected.
Therefore, it can the supporting setting pressure detecting part of correspondence position in quenching column, larger when system pressure drop is detected
When, opening dilution, oil burner nozzle 19 is rinsed, viscosity reductant is sprayed to demister, not only demister is carried out, extends making for demister
Use the life-span.Additionally, after viscosity reductant is mixed, reducing the viscosity of tar with the tar of accommodating area, can avoid in transportation
Tar coking, blocking pipeline, reduce operation and maintenance cost.And during the tar trapping of coal gas, the dilution, flushing oil
Nozzle 19 is in closed mode, it is to avoid the deoiling effect of impact coal gas.The selection of above-mentioned viscosity reductant can be varied, for example
Gasoline, diesel oil etc..
The capture method coal-tar middle oil to a kind of coal gas provided by the present invention, trapping system are described in detail above.
Specific case used herein is set forth to the principle of the present invention and embodiment, and the explanation of above example is to use
The method of the present invention and its core concept is understood in help.It should be pointed out that for those skilled in the art,
Under the premise without departing from the principles of the invention, some improvement can also being carried out to the present invention and being modified, these improve and modify
Fall in the protection domain of the claims in the present invention.
Claims (13)
1. the coal-tar middle oil capture method of a kind of coal gas, it is characterised in that comprise the steps：
Gas-gas heat exchange step, carries out heat exchange using cryogenic gas and coal gas of high temperature, reclaims coal gas of high temperature heat, reduces spray burnt
Oily usage amount；
Trapping step, is sprayed from the coal gas of high temperature after low temperature tar heat exchanging, makes the tar gas in coal gas condense analysis
Go out and be captured recovery；
Demisting step, progressively reclaims the tar droplet that will escape using two-stage demister.
2. the coal-tar middle oil capture method of coal gas according to claim 1, it is characterised in that the trapping step is specially：
Structured packing, filtering baffle are set, and using low temperature tar, coal gas are sprayed twice；Coal gas is made to first pass through the mistake
Filter baffle plate, contact with the low temperature tar reverse flow for spraying first again, then by the structured packing, while and secondary spraying
Low temperature tar reverse flow contact.
3. the coal-tar middle oil capture method of coal gas according to claim 1, it is characterised in that the demisting step is specially：
Rotational flow plate defroster, mesh mist eliminator or deflection plate demister are set, and make institute to be passed sequentially through through the coal gas for trapping step
State rotational flow plate defroster, the mesh mist eliminator or deflection plate demister.
4. the coal-tar middle oil capture method of coal gas according to any one of claim 1-3, it is characterised in that the gas-gas heat exchange
Cryogenic gas used in step is coal gas after the gas-gas heat exchange step, the trapping step and the demisting step
The low temperature coal gas of formation.
5. the coal-tar middle oil capture method of coal gas according to any one of claim 1-3, it is characterised in that the gas gas is changed
Tar that hot step, the trapping step, the demisting step are trapped is reclaimed, after cooling, a part sends storage, another portion outside
Divide the low temperature tar for the trapping step.
6. the coal-tar middle oil capture method of coal gas according to claim 5, it is characterised in that the tar temperature that control is reclaimed is situated between
Between 140 DEG C, 190 DEG C, and control the temperature of the spray tar between 70 DEG C, 110 DEG C.
7. the coal-tar middle oil trapping system of a kind of coal gas, it is characterised in that including quenching column (1), quenching column (1) from top to bottom
Set gradually：
Accommodating area (11), for housing the tar in the coal gas for reclaiming；
Air inlet pipe (12), for being input into coal gas of high temperature；
Gas distributor (18), the correspondence position after the air inlet pipe (12)；
Gas-gas heat exchanger (13), is provided with low temperature gas passage (131) separately, coal gas of high temperature passage (132)；
Trapping area (14), is provided with filtering baffle, structured packing and multiple nozzles for spraying low temperature tar, for burnt in coal gas
The trapping of oil gas body is reclaimed；
Escape pipe (15), for low temperature coal gas of the output after oil removing.
8. the coal-tar middle oil trapping system of coal gas according to claim 7, it is characterised in that trapping area (14) from lower to
On include successively：
Filtering baffle, for removing the dust that carries secretly in the coal gas of high temperature after heat exchange；
First jet (141), is connected with low temperature tar input pipe, for spraying low temperature tar first；
Structured packing (142), is fully contacted the low temperature tar of spray and coal gas of high temperature；
Second nozzle (143), is connected with low temperature tar input pipe, for secondary spraying low temperature tar.
9. the coal-tar middle oil trapping system of coal gas according to claim 7, it is characterised in that quenching column (1) is described
Demister (16) is additionally provided between trapping area (14), the escape pipe (15).
10. the coal-tar middle oil trapping system of coal gas according to claim 9, it is characterised in that demister (16) from
Under on including rotational flow plate defroster (161), mesh mist eliminator or deflection plate demister (162).
The coal-tar middle oil trapping system of 11. coal gas according to any one of claim 7-10, it is characterised in that the gas gas is changed
The entrance of the cryogenic gas passage (131) of the low temperature coal gas passage (131) of hot device (13) is connected, exports with the escape pipe (15)
It is connected with aftertreatment systems.
The coal-tar middle oil trapping system of 12. coal gas according to any one of claim 7-10, it is characterised in that also include tar
Delivery pump and tar cooler (17), accommodating area (11), the tar delivery pump, the tar cooler are linked in sequence,
The other end of the tar cooler is all connected with trapping area (14), tar tank.
The 13. tar trapping systems according to any one of claim 7-10, it is characterised in that quenching column (1) is removing
The top of day with fog is provided with dilution, rinses oil burner nozzle (19).
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| CN201610919126.8A CN106433804A (en) | 2016-10-20 | 2016-10-20 | Trapping method and trapping system for tar in coal gas |
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| CN107029523A (en) * | 2017-06-14 | 2017-08-11 | 湘潭大学 | Foam scrubber |
| CN107648966A (en) * | 2017-08-17 | 2018-02-02 | 浙江绿环工程机械有限公司 | One kind printing and dyeing gas processing device |
| CN108939888A (en) * | 2018-08-21 | 2018-12-07 | 北京鼎翰科技有限公司 | A kind of burning station-service high-temp waste gas desulfurization purifier |
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