CN109621621A - A kind of coking VOCs dispersing gas cleaning recovery and processing system and method - Google Patents
A kind of coking VOCs dispersing gas cleaning recovery and processing system and method Download PDFInfo
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- CN109621621A CN109621621A CN201811420071.1A CN201811420071A CN109621621A CN 109621621 A CN109621621 A CN 109621621A CN 201811420071 A CN201811420071 A CN 201811420071A CN 109621621 A CN109621621 A CN 109621621A
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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
- B01D53/002—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
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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
- B01D53/14—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 absorption
- B01D53/1487—Removing organic compounds
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
-
- 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
- B01D2257/708—Volatile organic compounds V.O.C.'s
Abstract
The present invention relates to a kind of coking VOCs dispersing gas cleaning recovery and processing system and technique, dispersing gas dashpot is equipped with multiple dispersing gas entrances, is separately connected the dispersing gas collection conduit of process units, oil product storage tank, the tank car that charges；The dispersing gas outlet of dispersing gas dashpot is connected with the dispersing gas entrance of condensate cooler, the dispersing gas entrance of the dispersing gas outlet connection washing oil decontaminating apparatus of condensate cooler, the entrance of the dispersing gas outlet connection dispersing gas air blower of washing oil decontaminating apparatus.Present invention centralized collection by the way of nitrogen protection by the dispersing gas of oil product storage tank, process units, vacuum system exhaust and oil product charging tank car; again to the dispersing gas of collection using the method for washing oil carrying out washing treatment after first condensing; useful aromatic hydrocarbons is recycled, the easy crystalline materials such as the naphthalene of easy Crystallization Plugging pipeline are removed；VOCs dispersing gas force feed is finally entered by gas burning system using air blower, is finally reached the purpose for recycling, preventing its leakage pollution environment completely to entire production process dispersing gas.
Description
Technical field
The present invention relates to industrial dispersing gas recovery processing technical fields more particularly to a kind of coking VOCs dispersing gas to clean back
Receive processing system and method.
Background technique
In coking industry environmental issue, the improvement of coking VOCs dispersing gas is especially prominent.The VOCs of this industry is diffused
Gas mainly includes the aromatic series such as benzene, phenol, naphthalene, anthracene and its derivative homologue, i.e. volatile organic compounds (VOCs).From source
On see, the major source of coking VOCs dispersing gas is the release of oil product storage tank, process units release, vacuum system exhaust and oil product dress
Hopper vehicle release etc..Currently, the improvement for VOCs dispersing gas both at home and abroad, can be divided mainly into absorption, condensing recovery, adsorbs, burns
Burning and biological treatment etc..Above-mentioned processing method superiority and inferiority is different, and enterprise is often applied in combination according to the different situations of process units
The above method.
" steel and iron industry Environment Protection Design specification " (GB50406-2017) recommends to introduce negative pressure coal gas system method, which is
VOCs dispersing gas is recycled in negative pressure gas piping using suction before the air blower of gas cleaning device, has prevented VOCs substantially
The uncontrollable discharge of dispersing gas, operating cost is low, simple process, and does not have secondary pollution, moreover it is possible to pass through gas cleaning system and return
Benzene, the ammonia etc. in VOCs dispersing gas are received, realizing VOCs dispersing gas turns waste into wealth, and improves site environment.But the technique is also deposited
Enter the possibility of negative pressure coal gas system in air, causes the oxygen content in gas cleaning system to increase, cause entire coal gas net
Change system-down, influences the safety of VOCs dispersing gas recovering effect and gas cleaning system, therefore to the groove body in negative pressure system
It is more demanding with pipeline closed.In addition, being crystallized since coking VOCs dispersing gas is low, easy with supply gas pressure, being perishable or stifled
The features such as filling in pipeline, conventional introducing negative pressure coal gas system method are difficult to realize continuous operation, many coking enterprises in actual production
Industry is just given it up after running for a period of time.
Summary of the invention
The present invention provides a kind of coking VOCs dispersing gas cleaning recovery and processing system and methods, by oil product storage tank, production
The dispersing gas of device, vacuum system exhaust and oil product charging tank car centralized collection by the way of nitrogen protection, then to collection
Dispersing gas is recycled useful aromatic hydrocarbons, is removed the naphthalene etc. of easy Crystallization Plugging pipeline using the method for washing oil carrying out washing treatment after first condensing
Easy crystalline material；VOCs dispersing gas force feed is finally entered by gas burning system using air blower, is finally reached and entire production process is put
Air-dispersing recycles completely, prevents the purpose of its leakage pollution environment.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of coking VOCs dispersing gas cleaning recovery and processing system, including dispersing gas dashpot, condensate cooler, washing oil are washed
Cleaning device and dispersing gas air blower；The dispersing gas dashpot is equipped with multiple dispersing gas entrances, is separately connected process units, oil
The dispersing gas collection conduit of product storage tank, the tank car that charges；The condensation oil export that dispersing gas buffers trench bottom passes through cold oil collecting pipe
The condensation oil-in of road connection oil product storage tank；The release of the dispersing gas outlet and condensate cooler lower part on dispersing gas dashpot top
Gas entrance is connected, and sets sub-cooled water inlet at the top of condensate cooler, and bottom sets sub-cooled water out, on condensate cooler
The dispersing gas entrance of the dispersing gas outlet connection washing oil decontaminating apparatus in portion, the condensation oil export of lower part connect on dispersing gas dashpot
Condensation oil-in；The entrance of the dispersing gas outlet connection dispersing gas air blower of washing oil decontaminating apparatus, dispersing gas air blower go out
Mouth connection outer combustion gas pipeline；The process units, dispersing gas dashpot, is respectively equipped on washing oil decontaminating apparatus oil product storage tank
Pressure-regulating device, process units and oil product storage tank are additionally provided with nitrogen protection device；It is set on the outlet conduit of dispersing gas air blower
Pressure-detecting device, oxygen content in-line analyzer.
The process units, oil product storage tank are equipped with the breather valve with fire arrester and hydraulic at the top of dispersing gas dashpot
Safety valve.
The process units is reaction tower or reaction kettle.
The charging arm oil filling riser bottom of the charging tank car sets material inlet, and material fill pump and stream are set on material inlet pipeline
Quantity regulating device；Dispersing gas outlet is set at the top of charging arm oil filling riser, sets dispersing gas stop valve on dispersing gas outlet conduit；Charge tank car
On be additionally provided with liquid level detection device, dispersing gas stop valve, liquid level detection device respectively with material fill pump interlocked control.
The washing oil decontaminating apparatus is made of oil gas washer, cleaning oil groove, exhaust washing column and washing oil circulating pump, oil gas
Washer and exhaust washing column are separately positioned at the top of cleaning oil groove and are connected to cleaning oil groove, clean oil groove, oil gas washer
It is connected between exhaust washing column by washing oil circulating line, washing oil circulating pump is set on washing oil circulating line.
A kind of coking VOCs dispersing gas cleaning recovery and treatment method based on the system, includes the following steps:
1) whole dispersing gas that process units and oil product storage tank are collected by the way of nitrogen protection take charging tank car
The instant mode adopted collects dispersing gas；
2) concentration of dispersing gas collected by enters dispersing gas surge tank, and safety device is arranged in the top of dispersing gas surge tank
Ensure system safety；The bottom of dispersing gas surge tank sets cold oil collection conduit, from dispersing gas surge tank come out dispersing gas with
Low-temperature cooling water carries out heat exchange in condensate cooler and realizes condensation cooling, and cold oil returns to dispersing gas surge tank；
3) washing oil decontaminating apparatus is escaped at the top of uncooled dispersing gas autocondensation cooler, first in oil gas washer
In the washing oil primary wash harmful substance sent by washing oil circulating pump, the washing oil after washing returns to cleaning oil groove, and dispersing gas enters row
Gas washing column is contacted with washing oil is removed in depth harmful substance；Washing oil in washing oil decontaminating apparatus is recycled and regularly replaces；
4) it is sent by dispersing gas air blower to outer combustion gas pipeline from the dispersing gas of exhaust washing column discharge and is participated in as fuel
Burning；Oxygen content in-line analyzer is set on dispersing gas blower exit conduits, once oxygen content is exceeded in discovery dispersing gas, system
Stop dispersing gas being sent into gas ductwork immediately, is changed to enter flare system.
The dispersing gas air blower sets variable frequency adjustment and bypass pipe adjusts the pressure that two ways controls to adjust whole system.
Compared with prior art, the beneficial effects of the present invention are:
1) dispersing gas of all uncontrollable discharges may be recovered in coking production system, thoroughly improve execute-in-place ring
Border；
2) light component is recycled using the condensation type of cooling first to greatest extent, cold oil is produced, increases economic efficiency；
3) incoagulability dispersing gas is finally blended into as fuel by gas ductwork using dispersing gas air blower, avoids and does not coagulate
Property dispersing gas environmental pollution, increase fuel gases calorific value, be conducive to improve Business Economic Benefit；
4) each equipment of nitrogen protection is used during dispersing gas is collected, not only avoid volatile organic compounds in system to
Loss in air, while also improving the fire savety of equipment.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of coking VOCs dispersing gas cleaning recovery and processing system of the present invention.
In figure: 1. process units, 2. oil product storage tank, 3. material fill pump, 4. charging arm oil filling riser 5. charging tank car 6. is put
7. condensate cooler of air-dispersing dashpot, 8. washing oil decontaminating apparatus, 81. oil gas washer 82. cleans the exhaust of oil groove 83. and cleans
12. dispersing gas stop valve of tower 9. washing oil circulating pump, 10. dispersing gas air blower, 11. outer combustion gas pipeline, 13. pressure adjusts dress
Set 14. liquid level detection device, 15. oxygen content in-line analyzer, 16. flow regulator
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing:
As shown in Figure 1, a kind of coking VOCs dispersing gas of the present invention cleans recovery and processing system, including dispersing gas buffering
Slot 6, condensate cooler 7, washing oil decontaminating apparatus 8 and dispersing gas air blower 10；The dispersing gas dashpot 6 is equipped with multiple releases
Gas entrance is separately connected the dispersing gas collection conduit of process units 1, oil product storage tank 2, the tank car 5 that charges；6 bottom of dispersing gas dashpot
The condensation oil export in portion connects the condensation oil-in of oil product storage tank 2 by cold oil collection conduit；6 top of dispersing gas dashpot
Dispersing gas outlet is connected with the dispersing gas entrance of 7 lower part of condensate cooler, and the top of condensate cooler 7 sets low-temperature cooling water and enters
Mouthful, bottom sets sub-cooled water out, the dispersing gas of the dispersing gas outlet connection washing oil decontaminating apparatus 8 on 7 top of condensate cooler
The condensation oil export of entrance, lower part connects the condensation oil-in on dispersing gas dashpot 6；The dispersing gas of washing oil decontaminating apparatus 8 goes out
The entrance of mouth connection dispersing gas air blower 10, the outlet of dispersing gas air blower connect outer combustion gas pipeline 11；The process units
1, oil product storage tank 2, dispersing gas dashpot 6, be respectively equipped with pressure-regulating device 13, process units 1 and oil on washing oil decontaminating apparatus 8
Product storage tank 2 is additionally provided with nitrogen protection device；Pressure-detecting device 13 is set on the outlet conduit of dispersing gas air blower 10, oxygen content exists
Line analysis instrument 15.
The process units 1, oil product storage tank 2, dispersing gas dashpot 6 top be equipped with breather valve and liquid with fire arrester
Press safety valve.
The process units 1 is reaction tower or reaction kettle.
4 bottom of charging arm oil filling riser of the charging tank car 5 sets material inlet, and material fill pump 3 is set on material inlet pipeline
With flow regulator 16；Dispersing gas outlet is set at the top of charging arm oil filling riser 4, sets dispersing gas stop valve on dispersing gas outlet conduit
12；Liquid level detection device 14 is additionally provided on charging tank car 5, dispersing gas stop valve 12, liquid level detection device 14 are filled with material respectively
Material 3 interlocked controls of pump.
The washing oil decontaminating apparatus 8 is by oil gas washer 81, cleaning oil groove 82, exhaust washing column 83 and washing oil circulating pump 9
Composition, oil gas washer 81 and exhaust washing column 83 are separately positioned on 82 top of cleaning oil groove and are connected to cleaning oil groove 82, clearly
It is connected between washing oil slot 82, oil gas washer 81 and exhaust washing column 83 by washing oil circulating line, is set on washing oil circulating line
Washing oil circulating pump 9.
A kind of coking VOCs dispersing gas cleaning recovery and treatment method based on the system, includes the following steps:
1) whole dispersing gas that process units 1 and oil product storage tank 2 are collected by the way of nitrogen protection, to charging tank car 5
The instant mode adopted is taken to collect dispersing gas；
2) concentration of dispersing gas collected by enters dispersing gas surge tank 6, the top setting safety dress of dispersing gas surge tank 6
Setting ensures system safety；The bottom of dispersing gas surge tank 6 sets cold oil collection conduit, the release come out from dispersing gas surge tank 6
Gas and low-temperature cooling water carry out heat exchange in condensate cooler 7 and realize condensation cooling, and cold oil returns to dispersing gas surge tank 6；
3) washing oil decontaminating apparatus 8 is escaped at the top of uncooled dispersing gas autocondensation cooler 7, is first cleaned in oil gas
The washing oil primary wash harmful substance sent in device 81 by washing oil circulating pump 9, the washing oil after washing return to cleaning oil groove 82, dispersing gas
It is contacted into exhaust washing column 83 with washing oil and harmful substance is removed in depth；Washing oil in washing oil decontaminating apparatus 81 is recycled and determines
Phase replacement；
4) it is sent from the dispersing gas that exhaust washing column 83 is discharged to outer combustion gas pipeline 11 by dispersing gas air blower 10 as combustion
Material participates in burning；Oxygen content in-line analyzer 15 is set on 10 outlet conduit of dispersing gas air blower, once oxygen contains in discovery dispersing gas
Measure it is exceeded, system stop immediately by dispersing gas be sent into outer combustion gas pipeline 11, be changed to enter flare system.
The dispersing gas air blower 10 sets variable frequency adjustment and bypass pipe adjusts the pressure that two ways controls to adjust whole system
Power.
In the present invention, the dispersing gas generated in process units 1 and oil product storage tank 2 is collected using nitrogen protection mode；It is different
The operation pressure of process units 1 is different, needs to be respectively set different pressure levels and is protected, and using seperating range control control
Mode operates operation.By taking vertex of a cone slot as an example: when passing in and out or passing in and out inventory balance in slot without material, gas phase keeps permanent substantially
Fixed (only a small amount of light component volatilization, can be ignored), groove top pressure is maintained within a certain range.When liquid phase material increase, top in slot
When gaseous pressure increases over the upper limit, pressure in the different aperture control flume of exhaust valve is adjusted according to pressure change.On the contrary, working as
In slot liquid phase material reduce, top gas phase pressure reduction and be lower than lower limit when, according to slot pressure change adjust nitrogen valve it is different
Aperture supplements a certain amount of nitrogen, and control tower pressure interior force is within the set range.Meanwhile to protect system operational safety, production dress
The top for setting 1, oil product storage tank 2 and dispersing gas dashpot 6 is respectively provided with breather valve and deadweight safety valve with fire arrester, avoids system
Equipment superpressure when pressure anomaly.
The dispersing gas in loading and unloading region is realized by the interlocked control two ways to loading and unloading flow and liquid level to putting
The centralized collection of air-dispersing.Such as: when material fill pump 3 starts, the interlocking of dispersing gas stop valve 12 is opened, when flowmeter monitors to charge
When completion, it is automatically stopped material fill pump 3 and closes dispersing gas stop valve 12.It is all not empty wagons charging when in view of entrucking,
Liquid level detection device 14 (such as level detector) is set on charging tank car 5, when liquid level in slot reaches the upper limit, is also had
There is the function of being automatically stopped material fill pump 3 and close dispersing gas stop valve 12.
Collected dispersing gas is fully incorporated dispersing gas surge tank 6, and 6 bottom of dispersing gas surge tank sets cold oil (i.e. benzene class
Light component) collecting pipe, dispersing gas cold oil obtained in condensation is collected using fluid-tight principle, which can flow automatically oil return product
Storage tank 2.The dispersing gas come out from dispersing gas surge tank 6 carries out heat exchange cooling using water at low temperature in dispersing gas condensate cooler 7,
Cold oil returns to dispersing gas surge tank 6, and uncooled dispersing gas enters washing oil decontaminating apparatus 8.
Uncooled dispersing gas is in the oil and gas washer 81 of washing oil decontaminating apparatus 8 first through washing oil primary wash nuisance
Then harmful substance is removed in depth in matter in exhaust washing column 83 (plate column).Dispersing gas after washed is by dispersing gas air blast
Machine 10 is sent to outer combustion gas pipeline 11.Dispersing gas air blower 10 adjusts two ways using variable frequency adjustment and bypass pipe, and control is adjusted
Save the pressure of entire dispersing gas recovery and processing system.10 outlet conduit of dispersing gas air blower sets oxygen content in-line analyzer 15, and one
Denier finds that oxygen content is exceeded in dispersing gas, and system stops for dispersing gas being sent into outer combustion gas pipeline 11, but enters flare system.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of coking VOCs dispersing gas cleans recovery and processing system, which is characterized in that including dispersing gas dashpot, condensation cooling
Device, washing oil decontaminating apparatus and dispersing gas air blower；The dispersing gas dashpot is equipped with multiple dispersing gas entrances, is separately connected life
Produce the dispersing gas collection conduit of device, oil product storage tank, the tank car that charges；The condensation oil export of dispersing gas buffering trench bottom passes through condensation
The condensation oil-in of oily collection conduit connection oil product storage tank；Under the dispersing gas outlet on dispersing gas dashpot top and condensate cooler
The dispersing gas entrance in portion is connected, and sub-cooled water inlet is set at the top of condensate cooler, and bottom sets sub-cooled water out, condensation
The dispersing gas entrance of the dispersing gas outlet connection washing oil decontaminating apparatus on cooler top, the condensation oil export of lower part connect dispersing gas
Condensation oil-in on dashpot；The entrance of the dispersing gas outlet connection dispersing gas air blower of washing oil decontaminating apparatus, release tympanites
The outlet of blower connects outer combustion gas pipeline；The process units, oil product storage tank, dispersing gas dashpot, on washing oil decontaminating apparatus
It is respectively equipped with pressure-regulating device, process units and oil product storage tank are additionally provided with nitrogen protection device；The outlet of dispersing gas air blower
Pressure-detecting device, oxygen content in-line analyzer are set on pipeline.
2. a kind of coking VOCs dispersing gas according to claim 1 cleans recovery and processing system, which is characterized in that the life
It produces device, oil product storage tank, be equipped with breather valve and deadweight safety valve with fire arrester at the top of dispersing gas dashpot.
3. the cleaning recovery system of VOCs dispersing gas in a kind ofization process of producing product according to claim 1 or 2, special
Sign is that the process units is reaction tower or reaction kettle.
4. a kind of coking VOCs dispersing gas according to claim 1 cleans recovery and processing system, which is characterized in that the dress
The charging arm oil filling riser bottom of hopper vehicle sets material inlet, and material fill pump and flow regulator are set on material inlet pipeline；Dress
Dispersing gas outlet is set at the top of material arm oil filling riser, sets dispersing gas stop valve on dispersing gas outlet conduit；Liquid level is additionally provided on charging tank car
Detection device, dispersing gas stop valve, liquid level detection device respectively with material fill pump interlocked control.
5. a kind of coking VOCs dispersing gas according to claim 1 cleans recovery and processing system, which is characterized in that described to wash
Oil wash cleaning device is made of oil gas washer, cleaning oil groove, exhaust washing column and washing oil circulating pump, and oil gas washer and exhaust are washed
Net tower is separately positioned at the top of cleaning oil groove and be connected to cleaning oil groove, cleaning oil groove, oil gas washer and be vented washing column it
Between connected by washing oil circulating line, washing oil circulating pump is set on washing oil circulating line.
6. a kind of coking VOCs dispersing gas based on system described in claim 1 cleans recovery and treatment method, which is characterized in that packet
Include following steps:
1) whole dispersing gas that process units and oil product storage tank are collected by the way of nitrogen protection are taken charging tank car and are used
The mode adopted collects dispersing gas；
2) concentration of dispersing gas collected by enters dispersing gas surge tank, and the top setting safety device of dispersing gas surge tank ensures
System safety；The bottom of dispersing gas surge tank sets cold oil collection conduit, the dispersing gas and low temperature come out from dispersing gas surge tank
Cooling water carries out heat exchange in condensate cooler and realizes condensation cooling, and cold oil returns to dispersing gas surge tank；
3) escape into washing oil decontaminating apparatus at the top of uncooled dispersing gas autocondensation cooler, first in oil gas washer by
The washing oil primary wash harmful substance that washing oil circulating pump is sent, the washing oil after washing return to cleaning oil groove, and dispersing gas enters exhaust and washes
Net tower is contacted with washing oil is removed in depth harmful substance；Washing oil in washing oil decontaminating apparatus is recycled and regularly replaces；
4) it is sent from the dispersing gas of exhaust washing column discharge by dispersing gas air blower to outer combustion gas pipeline and participates in burning as fuel；
Oxygen content in-line analyzer is set on dispersing gas blower exit conduits, once oxygen content is exceeded in discovery dispersing gas, system is immediately
Stop dispersing gas being sent into gas ductwork, is changed to enter flare system.
7. a kind of coking VOCs dispersing gas according to claim 6 cleans recovery and treatment method, which is characterized in that described to put
Air-dispersing air blower sets variable frequency adjustment and bypass pipe adjusts the pressure that two ways controls to adjust whole system.
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