CN106268220B - A kind of benzene hydrogenation tail gas desulfurization device and its sulfur removal technology - Google Patents
A kind of benzene hydrogenation tail gas desulfurization device and its sulfur removal technology Download PDFInfo
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- CN106268220B CN106268220B CN201610779359.2A CN201610779359A CN106268220B CN 106268220 B CN106268220 B CN 106268220B CN 201610779359 A CN201610779359 A CN 201610779359A CN 106268220 B CN106268220 B CN 106268220B
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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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
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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
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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Abstract
The present invention provides a kind of benzene hydrogenation tail gas desulfurization device and its sulfur removal technologies.The benzene hydrogenation tail gas desulfurization device includes desulfurizing tower, sulfur dioxide hold-up tank, waste water storage tank, waste water pump, first circulation pump and second circulation pump.It is benzene hydrogenation desulfurization device simple structure provided by the invention, low in cost, benzene hydrogenation tail gas desulfurization technique provided by the invention can make full use of the sulfur-containing waste water of hydrogenation system generation, desulfurizing tower is used to create suitable reaction condition for hydrogen sulfide and sulphur hydrogen radical, pass through the intervention of sulfur dioxide, achieve the purpose that hydrogen sulfide stripping, hydrogen sulfide stripping rate can reach 60% or more, to reduce the operating load of coking system desulfurizing tower, extend service life of equipment, the more available higher sulphur simple substance of purity；Using the original sulfur-containing waste water of system, solves sulfur-containing waste water pollution problem；Also solve difficult sulfur-containing tail gas and sulfur-containing tail gas burning bring secondary pollution and waste problem simultaneously.
Description
Technical field
The invention belongs to benzene hydrogenation process technical field, it is related to a kind of benzene hydrogenation tail gas desulfurization device and its sulfur removal technology.
Background technique
A kind of complicated gas containing high-concentration hydrogen sulfide that benzene hydrogenation tail gas generates during being mainly benzol hydro refining unit operation
Body, producing cause are that the sulfurous organic compound (such as thiophene, mercaptan) in crude benzol reacts generation hydrogen sulfide with hydrogen in hydrogenation process,
To reach final products index request, this partial vulcanization hydrogen need to be arranged in the form of tail gas together with other components in dehydration processes
It puts.The component of tail gas is more, mainly includes methane, butane, pentane, hydrogen sulfide, ammonia and a small amount of hydrogen, benzene etc..
Hydrogen sulfide chemical formula is H2S, is a kind of colourless, inflammable sour gas under normal circumstances, band stench when concentration is low,
Smell such as addled egg；Instead without smell (because the hydrogen sulfide of high concentration can benumb olfactory nerves) when concentration is high.Hydrogen sulfide is
A kind of acute severe toxicity, sucking a small amount of high-concentration hydrogen sulfide can be in fatal in the short time.The hydrogen sulfide of low concentration is to eye, respiratory system
And nervous centralis all has an impact.
A large amount of hydrogen sulfide is generated in benzol hydro refining unit hydrogenation process production process, this partial vulcanization hydrogen must be in de- light industry
Sequence is discharged in the form of sulfur-containing tail gas, to meet the purpose of production qualified products.The tail gas of discharge is because of concentration of hydrogen sulfide height
Up to 30% (wt) and contain part fuel gas, is not directly discharged into atmosphere.
This portion gas is sent into coking plant desulfurizing tower and carries out desulfurization process by majority device at present.Coking plant desulfurizing tower
Using HPF doctor treatment, HPF method desulfurization category liquid phase catalytic oxidation desulfurization, HPF catalyst in desulfurization and regeneration overall process by
Catalytic action is to make absorbent using the ammonia in coke-stove gas, the H using HPF as the Wet-type oxidation sweetening of catalyst, in coal gas2S
Equal acidic components enter liquid phase by gas phase and react with ammonia, are converted into the acid ammonium salts such as hydrogen sulfide ammonium, then the oxidation of oxygen in air
Under be converted into elementary sulfur.HPF method desulfurization selection uses HPF (quinone ferro-cobalt class) composite catalyst, can make the desulfurization of coke-stove gas
Efficiency reaches 99% or so.
Coking plant desulfurizing tower is coke oven Aided design, and concentration of hydrogen sulfide in sulfur-containing tail gas caused by benzol hydro refining unit
Excessively high, tail gas enters desulfurizing tower and increases by 20% or more device operating load, seriously affects desulfuration efficiency.HPF doctor treatment operation effect
Fruit is affected desulfuration efficiency by many-sided restriction such as ammonia still operating condition, ammonia concn, doctor solution surplus, causes environmentally friendly hardly possible
Topic.
Separately there is NaHS absorption process to produce NaHS device, using sodium hydroxide absorption process, sour gas passes through water
Tower is washed, Ammonia contained in sour gas is washed away, the solution containing ammonium hydro sulfide after washing is sent to acid water stripper workshop section gas
Propose processing.Gas passes through two-stage lye absorbing reaction device (R101A/B) from bottom to top and produces under the effect of the catalyst after deamination
NaHS, the production process of NaHS are that generation is reacted with hydrogen sulfide using 30%-45% sodium hydroxide solution as absorbent
Vulcanized sodium gradually produces NaHS with being continuously increased for hydrogen sulfide is absorbed.
But the technical operation process is related to multiple processes such as washing, stripping, lye absorption, process is relative complex, production
Disposal process is restricted by various aspects.Water in washing, alkali cleaning increase system, breaks systematic water balance.NaHS device relates to
And equipment is more, investment is big, and generated NaHS cannot form scale, and benefit is low, and equally exist in storing process and produce
The case where raw environmental issue.
Because a kind of new tail gas treatment process of the invention improves current vent gas treatment predicament, it has also become urgently to be resolved asks
Topic.
Summary of the invention
Based on above-mentioned technical problem, the purpose of the present invention is to provide a kind of benzene hydrogenation tail gas desulfurization device and its desulfurization works
Skill makes full use of the sulfur-containing waste water generated in hydrogenation system, and using desulfurizing tower to create for hydrogen sulfide with sulphur hydrogen radical is suitable for reacting item
Part achievees the purpose that hydrogen sulfide stripping by the intervention of sulfur dioxide, so that the operating load of coking system desulfurizing tower is reduced,
Extend service life of equipment, the more available higher sulphur simple substance of purity.
The purpose of the present invention is achieved by the following technical programs:
The present invention provides a kind of benzene hydrogenation tail gas desulfurization device, which includes desulfurizing tower, dioxy
Change sulphur hold-up tank, waste water storage tank, waste water pump, first circulation pump and second circulation pump；
Gaseous phase outlet is provided at the top of the desulfurizing tower, the bottom of the desulfurizing tower is provided with liquid-phase outlet, described de-
Liquid phase entrance, the first gas phase entrance and the second gas phase entrance are provided on the outer wall of sulphur tower, the gaseous phase outlet, the liquid phase go out
Mouth, the liquid phase entrance, the first gas phase entrance and the second gas phase entrance are connected with the inside of the desulfurizing tower；Institute
It states the first gas phase entrance and the second gas phase entrance is located at the lower section of the liquid phase entrance；
The waste water storage tank is connected with the waste water pump, and the waste water pump is connected with the liquid phase entrance；
Successively mutually circulation is connected to for the liquid-phase outlet, first circulation pump and the liquid phase entrance；
Successively mutually circulation is connected to for the liquid-phase outlet, second circulation pump and the liquid phase entrance；The second circulation
It pumps and is provided with branch pipeline on the pipeline being connected with the liquid phase entrance, the branch pipeline is connected with the external world；
The gaseous phase outlet is connected with the external world；
The first gas phase entrance is connected with the offgas outlet of benzol hydro refining unit；
The second gas phase entrance is connected with the sulfur dioxide hold-up tank.
In above-mentioned benzene hydrogenation tail gas desulfurization device, it is preferable that the branch pipeline is connected with coking plant；The gas phase goes out
Mouth is connected with production workshop is changed.
In above-mentioned benzene hydrogenation tail gas desulfurization device, it is preferable that the benzene hydrogenation tail gas desulfurization device further includes water sealed tank, institute
It states and is additionally provided with overflow port on the outer wall of desulfurizing tower；
The overflow port is located at the lower section of the liquid phase entrance and is located at the first gas phase entrance and second gas phase
The top of entrance, and be connected with the inside of the desulfurizing tower；
The entrance of the water sealed tank is connected with the overflow port；The outlet of the water sealed tank is connected with the waste water storage tank
It is logical.
In above-mentioned benzene hydrogenation tail gas desulfurization device, it is preferable that be arranged on the pipeline that the gaseous phase outlet is connected with the external world
There is first pressure gauge.
In above-mentioned benzene hydrogenation tail gas desulfurization device, it is preferable that the first pressure gauge is connected with the gaseous phase outlet
Control valve is provided on pipeline.
In above-mentioned benzene hydrogenation tail gas desulfurization device, it is preferable that the tail gas of the first gas phase entrance and benzol hydro refining unit goes out
Second pressure gauge is provided on the pipeline that mouth is connected.
In above-mentioned benzene hydrogenation tail gas desulfurization device, it is preferable that the second pressure gauge is connected with the first gas phase entrance
Control valve is provided on logical pipeline.
In above-mentioned benzene hydrogenation tail gas desulfurization device, it is preferable that the both ends of the first circulation pump and second circulation pump
It is each provided with control valve.
In above-mentioned benzene hydrogenation tail gas desulfurization device, it is preferable that
Control valve is provided on the pipeline that the first circulation pump is connected with the liquid phase entrance；The liquid-phase outlet with
Control valve is provided on the pipeline that the first circulation pump is connected；
Control valve is provided on the pipeline that the second circulation pump is connected with the liquid phase entrance；The liquid-phase outlet with
Control valve is provided on the pipeline that the second circulation pump is connected；It is provided on the pipeline that the branch pipeline is connected with the external world
Control valve.
In above-mentioned benzene hydrogenation tail gas desulfurization device, it is preferable that the pipeline that the waste water pump is connected with the liquid phase entrance
On be provided with control valve.
In above-mentioned benzene hydrogenation tail gas desulfurization device, it is preferable that be contained with hydrogen sulfide ammonium inside the desulfurizing tower, but be not limited to
This.
The present invention also provides a kind of benzene hydrogenation tail gas desulfurization technique, use above-mentioned benzene hydrogenation tail gas desulfurization device into
Row, comprising the following steps:
Step 1 opens the first gas phase entrance and is connected with the offgas outlet of benzol hydro refining unit the valve on pipeline,
The tail gas that benzol hydro refining unit generates is passed through to the inside of the desulfurizing tower, the waste water pump is opened and is connected with the liquid phase entrance
Valve on pipeline starts the waste water pump, and the sulfur-containing waste water in the waste water storage tank is passed into the inside of the desulfurizing tower；
Step 2 opens the valve of the gaseous phase outlet, and the pressure to first gas phase inlet is to 40-
100kPa and when 30-60kPa bigger than pressure at the gaseous phase outlet, closes the waste water pump, and close the waste water pump with
The liquid phase entrance is connected the valve on pipeline, while starting the first circulation and pumping and open the first circulation pump disengaging
Mouth valve opens valve and the unlatching first circulation pump that the liquid-phase outlet is connected on pipeline with first circulation pump
Be connected the valve on pipeline with the liquid phase entrance；
Step 3 after stabilization to be recycled, opens the sulfur dioxide hold-up tank and is connected with the second gas phase entrance siphunculus
The valve of road, to the desulfurizing tower inside be filled with SO2, control SO2It is 40-100kPa into pressure, makes SO2With the desulfurization
The tail gas that hydrogen sulfide ammonium, sulfur-containing waste water and the benzol hydro refining unit held inside tower generates is reacted, check at any time desulfuration pipeline
Middle H2The content of S, and adjust SO2Additional amount, guarantee SO at the gaseous phase outlet2Detection limit is 0；Desulfidation tail gas after reaction
It send via the gaseous phase outlet pipeline to change and produces workshop；Doctor solution after reaction is followed again by first circulation pump
Ring；
Step 4 closes the sulfur dioxide hold-up tank and the second gas phase entrance phase after benzol hydro refining unit parking
Valve on connecting pipeline stops being filled with SO to the inside of the desulfurizing tower2；The waste water pump is opened to be connected with the liquid phase entrance
The valve of siphunculus road flows into the doctor solution after the reaction in the desulfurizing tower in the waste water storage tank, until the desulfurization
When in tower without doctor solution, closes the valve of the first circulation pump inlet and outlet and stop the first circulation pump；Close the gas
Mutually the valve of outlet, the closing liquid-phase outlet pump the valve being connected on pipeline and closing described first with the first circulation
Circulating pump is connected the valve on pipeline with the liquid phase entrance.
In above-mentioned benzene hydrogenation tail gas desulfurization technique, in order to avoid the elemental sulfur generated in reaction process builds up blocking
Pipeline, it is preferable that the benzene hydrogenation tail gas desulfurization technique further include during the circular flow in above-mentioned steps three, it is 8-10 hours every
The step of once being replaced to the doctor solution after reaction, the step include:
The valve of the branch pipeline is opened, the branch pipeline is connected with coking plant, starts the second circulation pump, beats
It opens the valve of the second circulation pump inlet and outlet, open the valve that the second circulation pump is connected on pipeline with the liquid phase entrance
Door and the opening second circulation pump the valve on pipeline that is connected with the liquid-phase outlet, to first gas phase inlet
Pressure is compared with 10-15kPa is reduced before replacement operator when, the valve of the second circulation pump inlet and outlet is closed, closing described second follows
The valve and closing that ring pump is connected on pipeline with the liquid phase entrance second circulation pump are connected with the liquid-phase outlet
Valve on pipeline stops the second circulation pump；Close the valve of the branch pipeline；
The valve that the waste water pump is connected on pipeline with the liquid phase entrance is opened, the waste water pump is started, it will be described
Sulfur-containing waste water in waste water storage tank is passed into the inside of the desulfurizing tower；Pressure recovery to first gas phase inlet is to setting
When changing the pressure before operating, the valve that the waste water pump is connected on pipeline with the liquid phase entrance is closed, is stopped described useless
Water pump.
The purpose of water sealed tank of benzene hydrogenation device for recovering tail gas provided by the invention setting is liquid inside desulfurizing tower in order to prevent
When position is excessively high, liquid is prevented from entering gaseous phase outlet pipeline by water seal overflow to waste water storage tank.
Benzene hydrogenation solvent recovery technology from vent gas provided by the invention passes through the sulfur-containing tail gas in benzene hydrogenation device for recovering tail gas
Control valve is decompressed within 100kPa, into desulfurizing tower, through with sulfur-containing waste water, hydrogen sulfide ammonium in tower and from SO out-of-bounds2Instead
It answers, by entering exhaust pipe at the top of desulfurizing tower after removing partial vulcanization hydrogen, and send further to production workshop gas piping progress is changed
Desulfurization.The chemical equation of reaction principle is as follows:
2NH4HS+SO2→2NH3+3S+2H2O (ammonia reacts)；
NH3+H2S=NH4HS (desulphurization reaction)；
Overall reaction equation: 2H2S+SO2=3S+2H2O。
In above-mentioned reaction process, reaction condition requirement is wide in range, does not need the intervention of catalyst, reaction process heat release can
Meet reaction required temperature requirement.
Benzene hydrogenation desulfurization device simple structure provided by the invention, low in cost, benzene hydrogenation tail gas provided by the invention is de-
Sulphur technique can make full use of the sulfur-containing waste water of hydrogenation system generation, use desulfurizing tower suitable anti-for hydrogen sulfide and the creation of sulphur hydrogen radical
Condition to be answered, by the intervention of sulfur dioxide, achievees the purpose that hydrogen sulfide stripping, hydrogen sulfide stripping rate can reach 60% or more, from
And the operating load of coking system desulfurizing tower is reduced, extend service life of equipment, the more available higher sulphur simple substance of purity；It adopts
With the original sulfur-containing waste water of system, solves sulfur-containing waste water pollution problem；Also solve that sulfur-containing tail gas is difficult and sulfur-bearing simultaneously
Tail gas burns bring secondary pollution and waste problem.
Detailed description of the invention
Fig. 1 is benzene hydrogenation tail gas desulfurization schematic device in the embodiment of the present invention；
Accompanying drawings symbol description:
1 desulfurizing tower, 2 sulfur dioxide hold-up tanks, 3 waste water storage tanks, 4 first circulations pump, 5 second circulations pump, 6 water sealed tanks, 7 is useless
Water pump, 8 second pressure gauges, 9 first pressure gauges, 10-21 control valve.
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now to skill of the invention
Art scheme carries out described further below, but should not be understood as that limiting the scope of the invention.
Embodiment
The present embodiment provides a kind of benzene hydrogenation tail gas desulfurization devices, as shown in Figure 1, the benzene hydrogenation tail gas desulfurization device includes
Desulfurizing tower 1, sulfur dioxide hold-up tank 2, waste water storage tank 3, waste water pump 7, first circulation pump 4, second circulation pump 5, water sealed tank 6；It is de-
The top of sulphur tower 1 is provided with gaseous phase outlet, and the bottom of desulfurizing tower 1 is provided with liquid-phase outlet, is provided with liquid on the outer wall of desulfurizing tower 1
Phase entrance, the first gas phase entrance, the second gas phase entrance and overflow port, the gaseous phase outlet, the liquid-phase outlet, the liquid phase enter
Mouth, the first gas phase entrance, the second gas phase entrance, the overflow port are connected with the inside of desulfurizing tower 1；Described first
Gas phase entrance and the second gas phase entrance are located at the lower section of the liquid phase entrance, and the overflow port is located at the liquid phase entrance
Lower section and the top for being located at the first gas phase entrance and the second gas phase entrance.
Waste water storage tank 3 is connected with waste water pump 7, and waste water pump 7 is connected with the liquid phase entrance；The liquid-phase outlet,
One circulating pump 4 and the liquid phase entrance are sequentially connected logical；The liquid-phase outlet, second circulation pump 5 and the liquid phase entrance are successively
It is connected；It is provided with branch pipeline on the pipeline that second circulation pump 5 is connected with the liquid phase entrance, the branch pipeline is connected to coke
Makeup is set；Being connected to of gaseous phase outlet produces workshop；The first gas phase entrance is connected with the offgas outlet of benzol hydro refining unit
It is logical；The second gas phase entrance is connected with the sulfur dioxide hold-up tank 2.The entrance of water sealed tank 6 is connected with the overflow port
It is logical；The outlet of water sealed tank 6 is connected with waste water storage tank 3.
The gaseous phase outlet produces with change and is provided with first pressure gauge 9 on the pipeline that workshop is connected；First pressure gauge 9 and institute
It states and is provided with control valve 13 on the pipeline that gaseous phase outlet is connected.The offgas outlet of the first gas phase entrance and benzol hydro refining unit
Second pressure gauge 8 is provided on the pipeline being connected；It is set on the pipeline that second pressure gauge 8 is connected with the first gas phase entrance
It is equipped with control valve 10.The both ends of first circulation pump 4 and second circulation pump 5 are each provided with control valve 14,15 and control valve 16,17.
Control valve 20 is provided on the pipeline that first circulation pump 4 is connected with the liquid phase entrance；The liquid-phase outlet and first circulation
Control valve 12 is provided on the pipeline that pump 4 is connected；Control is shared on the pipeline that second circulation pump 5 is connected with the liquid phase entrance
Valve 20 processed；Control valve 12 is shared on the pipeline that the liquid-phase outlet is connected with second circulation pump 5；The branch pipeline and coking fill
It sets and is provided with control valve 18 on the pipeline being connected.First circulation pump 4 pumps 5 phases circulation with second circulation and is connected to, and shares control
Valve 20 and control valve 12 simultaneously mutually recycle at it and are provided with control valve 19 on pipeline being connected to.Waste water pump 7 and the liquid phase entrance phase
Control valve 21 is provided on the pipeline of connection.
Hydrogen sulfide ammonium is contained with inside desulfurizing tower 1.
The present embodiment also provides a kind of benzene hydrogenation tail gas desulfurization technique, use above-mentioned benzene hydrogenation tail gas desulfurization device into
Row, comprising the following steps:
The tail gas that benzol hydro refining unit generates is passed through inside desulfurizing tower 1 by step 1, opening controlling valve 10, opens control valve
21, start waste water pump 7, the sulfur-containing waste water in waste water storage tank 3 is passed into inside desulfurizing tower 1；
Step 2, opening controlling valve 9 control first pressure gauge 9 and second pressure gauge 10, to first gas phase inlet
Pressure to 100kPa and 60kPa bigger than pressure at the gaseous phase outlet when, close waste water pump 7, and close control valve
21, while starting first circulation pump 4 and opening controlling valve 14 and 15, opening controlling valve 20 and 12；
Step 3, after stabilization to be recycled, opening controlling valve 14, to the desulfurizing tower inside be filled with SO2, control SO2Into pressure
Power is 100kPa, makes SO2The tail gas generated with the hydrogen sulfide ammonium, sulfur-containing waste water and benzol hydro refining unit that are held inside desulfurizing tower 1 into
Row reacts, check at any time H in desulfuration pipeline2The content of S, and adjust SO2Additional amount, guarantee SO at the gaseous phase outlet2Detection
Amount is 0；Desulfidation tail gas after reaction, which is sent via the gaseous phase outlet pipeline to change, produces workshop；Doctor solution after reaction passes through first
Circulating pump 4 is recycled again；
Step 4 closes control valve 10, stops being filled with SO to the inside of desulfurizing tower 1 after benzol hydro refining unit parking2；It opens
Control valve 21 flows into the doctor solution after the reaction in desulfurizing tower 1 in waste water storage tank 3, until in desulfurizing tower 1 without doctor solution when,
It closes control valve 14 and 15 and stops first circulation pump 4；It closes control valve 13, close control valve 20 and 12.
During the circular flow in above-mentioned steps three, in order to avoid the elemental sulfur of generation builds up blocking pipeline, often
The step of 8h once replaces the doctor solution after reaction, the step include:
Control valve 18 is opened, starting second circulation pump 5 opens control valve 16,17 and 19, to first gas phase inlet
Pressure compared with before replacement operator reduce 15kPa when, close control valve 16,17,18 and 19, stop second circulation pump 5；
Control valve 21 is opened, starts waste water pump 7, the sulfur-containing waste water in waste water storage tank 3 is passed into the inside of desulfurizing tower 1；
When pressure before the pressure recovery to replacement operator of first gas phase inlet, control valve 21 is closed, stops waste water pump
7。
Following table 1 is the cost budgeting table of above-mentioned benzene hydrogenation tail gas desulfurization technique:
Table 1
Using above-mentioned technique, initial investment is low, and mating 100,000 tons of benzol hydro refining units only need 1 desulfurizing tower and 2 circulating pumps,
Equipment input cost is low, and process flow is simple.Reaction, as systematic water balance medium, does not need additionally to increase using sulfur-containing waste water
Water consumption, reaction process do not need the intervention of catalyst, by the heat discharged in reaction process, temperature needed for meeting reaction
Degree.Using above-mentioned benzene hydrogenation tail gas desulfurization technique, detects and show by long-play, using this benzene hydrogenation tail gas desulfurization device
After carrying out desulfurization, the tail gas desulfurization efficiency that benzene hydrogenation process generates reaches 60% or more.
In conclusion benzene hydrogenation desulfurization device simple structure provided by the invention, low in cost, benzene provided by the invention adds
Hydrogen tail gas desulfurization technique can make full use of the sulfur-containing waste water of hydrogenation system generation, and desulfurizing tower is used to create for hydrogen sulfide and sulphur hydrogen radical
Suitable reaction condition is made, by the intervention of sulfur dioxide, achievees the purpose that hydrogen sulfide stripping, hydrogen sulfide stripping rate can reach 60%
More than, to reduce the operating load of coking system desulfurizing tower, extend service life of equipment, the more available higher sulphur of purity
Simple substance；Using the original sulfur-containing waste water of system, solves sulfur-containing waste water pollution problem；It is difficult also to solve sulfur-containing tail gas simultaneously,
And sulfur-containing tail gas burns bring secondary pollution and waste problem.
Claims (11)
1. a kind of benzene hydrogenation tail gas desulfurization technique uses benzene hydrogenation tail gas desulfurization device to carry out, the benzene hydrogenation tail gas desulfurization
Device includes desulfurizing tower, sulfur dioxide hold-up tank, waste water storage tank, waste water pump, first circulation pump and second circulation pump；
Gaseous phase outlet is provided at the top of the desulfurizing tower, the bottom of the desulfurizing tower is provided with liquid-phase outlet, the desulfurizing tower
Outer wall on be provided with liquid phase entrance, the first gas phase entrance and the second gas phase entrance, the gaseous phase outlet, the liquid-phase outlet,
The liquid phase entrance, the first gas phase entrance and the second gas phase entrance are connected with the inside of the desulfurizing tower；It is described
First gas phase entrance and the second gas phase entrance are located at the lower section of the liquid phase entrance；
The waste water storage tank is connected with the waste water pump, and the waste water pump is connected with the liquid phase entrance；
The liquid-phase outlet, first circulation pump and the liquid phase entrance are sequentially connected logical；
The liquid-phase outlet, second circulation pump and the liquid phase entrance are sequentially connected logical；Second circulation pump with it is described
Branch pipeline is provided on the pipeline that liquid phase entrance is connected, the branch pipeline is connected with the external world；
The gaseous phase outlet is connected with the external world；
The first gas phase entrance is connected with the offgas outlet of benzol hydro refining unit；
The second gas phase entrance is connected with the sulfur dioxide hold-up tank；
The benzene hydrogenation tail gas desulfurization technique the following steps are included:
Step 1 opens the first gas phase entrance and is connected with the offgas outlet from benzol hydro refining unit the valve on pipeline,
The tail gas that benzol hydro refining unit generates is passed through to the inside of the desulfurizing tower, the waste water pump is opened and is connected with the liquid phase entrance
Valve on pipeline starts the waste water pump, and the sulfur-containing waste water in the waste water storage tank is passed into the inside of the desulfurizing tower；
Step 2 opens the valve of the gaseous phase outlet, the pressure to first gas phase inlet to 40-100kPa and
When 30-60kPa bigger than pressure at the gaseous phase outlet, the waste water pump is closed, and close the waste water pump and the liquid phase
Entrance is connected the valve on pipeline, at the same start the first circulation pump and open the first circulation pump exits and entrances valve,
Open valve that the liquid-phase outlet and the first circulation pump are connected on pipeline and open the first circulation pump with it is described
Liquid phase entrance is connected the valve on pipeline；
Step 3 after stabilization to be recycled, opens the sulfur dioxide hold-up tank and is connected on pipeline with the second gas phase entrance
Valve, to the desulfurizing tower inside be filled with SO2, control SO2It is 40-100kPa into pressure, makes SO2In the desulfurizing tower
The tail gas that hydrogen sulfide ammonium, sulfur-containing waste water and the benzol hydro refining unit that portion is held generate is reacted, check at any time H in desulfuration pipeline2S
Content, and adjust SO2Additional amount, guarantee SO at the gaseous phase outlet2Detection limit is 0；Desulfidation tail gas after reaction is via institute
Gaseous phase outlet pipeline is stated to send to change production workshop；Doctor solution after reaction is recycled again by first circulation pump；
Step 4 closes the sulfur dioxide hold-up tank and is connected with the second gas phase entrance after benzol hydro refining unit parking
Valve on pipeline stops being filled with SO to the inside of the desulfurizing tower2；The waste water pump is opened to be connected with the liquid phase entrance siphunculus
The valve of road flows into the doctor solution after the reaction in the desulfurizing tower in the waste water storage tank, until in the desulfurizing tower
When without doctor solution, closes the valve of the first circulation pump inlet and outlet and stop the first circulation pump；The gas phase is closed to go out
Valve, the closing liquid-phase outlet of mouth pump the valve being connected on pipeline with the first circulation and close the first circulation
Pump the valve on pipeline that is connected with the liquid phase entrance.
2. benzene hydrogenation tail gas desulfurization technique according to claim 1, it is characterised in that: the branch pipeline and coking plant phase
Connection；The gaseous phase outlet is connected with production workshop is changed.
3. benzene hydrogenation tail gas desulfurization technique according to claim 1, it is characterised in that: the benzene hydrogenation tail gas desulfurization device
Further include water sealed tank, is additionally provided with overflow port on the outer wall of the desulfurizing tower；
The overflow port is located at the lower section of the liquid phase entrance and is located at the first gas phase entrance and the second gas phase entrance
Top, and be connected with the inside of the desulfurizing tower；
The entrance of the water sealed tank is connected with the overflow port；The outlet of the water sealed tank is connected with the waste water storage tank.
4. benzene hydrogenation tail gas desulfurization technique according to claim 1, it is characterised in that: the gaseous phase outlet is connected with the external world
First pressure gauge is provided on logical pipeline；The pipeline that the first gas phase entrance is connected with the offgas outlet of benzol hydro refining unit
On be provided with second pressure gauge.
5. benzene hydrogenation tail gas desulfurization technique according to claim 4, it is characterised in that: the first pressure gauge and the gas
It mutually exports and is provided with control valve on the pipeline being connected.
6. benzene hydrogenation tail gas desulfurization technique according to claim 4, it is characterised in that: the second pressure gauge and described the
Control valve is provided on the pipeline that one gas phase entrance is connected.
7. benzene hydrogenation tail gas desulfurization technique according to claim 1, it is characterised in that: first circulation pump and described the
The both ends of two circulating pumps are each provided with control valve.
8. benzene hydrogenation tail gas desulfurization technique according to claim 1, it is characterised in that:
Control valve is provided on the pipeline that the first circulation pump is connected with the liquid phase entrance；The liquid-phase outlet with it is described
Control valve is provided on the pipeline that first circulation pump is connected；
Control valve is provided on the pipeline that the second circulation pump is connected with the liquid phase entrance；The liquid-phase outlet with it is described
Control valve is provided on the pipeline that second circulation pump is connected；Control is provided on the pipeline that the branch pipeline is connected with the external world
Valve.
9. benzene hydrogenation tail gas desulfurization technique according to claim 1, it is characterised in that: the waste water pump enters with the liquid phase
Control valve is provided on the pipeline that mouth is connected.
10. benzene hydrogenation tail gas desulfurization technique according to claim 1, it is characterised in that: be contained with inside the desulfurizing tower
Hydrogen sulfide ammonium.
11. benzene hydrogenation tail gas desulfurization technique according to claim 1, which is characterized in that the benzene hydrogenation tail gas desulfurization technique
It further include every 8-10 hours step once replaced to the doctor solution after reaction during the circular flow in above-mentioned steps three
Suddenly, which includes:
The valve of the branch pipeline is opened, the branch pipeline is connected with coking plant, starts the second circulation pump, opens institute
State the valve of second circulation pump inlet and outlet, open valve that second circulation pump is connected on pipeline with the liquid phase entrance and
It opens the second circulation and pumps the valve being connected on pipeline with the liquid-phase outlet, the pressure to first gas phase inlet
When compared with reducing 10-15kPa before replacement operator, closing the valve of the second circulation pump inlet and outlet, closing the second circulation pump
It is connected with the liquid phase entrance and the valve on pipeline and closes second circulation pump and be connected with the liquid-phase outlet pipeline
On valve, stop second circulation pump；Close the valve of the branch pipeline；
The valve that the waste water pump is connected on pipeline with the liquid phase entrance is opened, the waste water pump is started, by the waste water
Sulfur-containing waste water in storage tank is passed into the inside of the desulfurizing tower；To first gas phase inlet pressure recovery to replace behaviour
When pressure before work, the valve that the waste water pump is connected on pipeline with the liquid phase entrance is closed, the waste water pump is stopped.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610779359.2A CN106268220B (en) | 2016-08-30 | 2016-08-30 | A kind of benzene hydrogenation tail gas desulfurization device and its sulfur removal technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610779359.2A CN106268220B (en) | 2016-08-30 | 2016-08-30 | A kind of benzene hydrogenation tail gas desulfurization device and its sulfur removal technology |
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| CN106268220B true CN106268220B (en) | 2019-01-04 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102227372A (en) * | 2008-11-28 | 2011-10-26 | 国际壳牌研究有限公司 | Process for selective oxidation of hydrogen sulphide |
| CN204469528U (en) * | 2015-03-04 | 2015-07-15 | 河北新启元能源技术开发股份有限公司 | Device for recovering tail gas |
| CN104910970A (en) * | 2015-05-22 | 2015-09-16 | 张玲 | Series-process coal gas desulfurization process method and desulfurization device therefor |
-
2016
- 2016-08-30 CN CN201610779359.2A patent/CN106268220B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102227372A (en) * | 2008-11-28 | 2011-10-26 | 国际壳牌研究有限公司 | Process for selective oxidation of hydrogen sulphide |
| CN204469528U (en) * | 2015-03-04 | 2015-07-15 | 河北新启元能源技术开发股份有限公司 | Device for recovering tail gas |
| CN104910970A (en) * | 2015-05-22 | 2015-09-16 | 张玲 | Series-process coal gas desulfurization process method and desulfurization device therefor |
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| CN106268220A (en) | 2017-01-04 |
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