CN106914103A - A kind of Claus tail gases low-temp desulfurization system and technique - Google Patents
A kind of Claus tail gases low-temp desulfurization system and technique Download PDFInfo
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- 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
- B01D53/1456—Removing acid components
- B01D53/1468—Removing hydrogen sulfide
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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
- B01D53/86—Catalytic processes
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Abstract
Concretely it is a kind of Claus tail gases low-temp desulfurization system and technique the present invention relates to industrial tail gas desulfuration field, is characterized in that：Claus tail gases obtained in industrial production are passed into a temperature-reducing tower cooling from tracheae is entered；The Claus tail gases of cooling are delivered in absorption tower by a delivery pipe from a temperature-reducing tower, claus reaction occurs in the presence of catalyst；Solution containing sulphur simple substance is discharged by sulphur discharging pipeline from absorption tower, and single order tail gas is discharged by No. three delivery pipes from absorption tower；Single order tail gas in No. three delivery pipes is passed into No. two temperature-reducing towers and is lowered the temperature；The single order tail gas of cooling is delivered in catalysis oxidizing tower by No. four delivery pipes from No. two temperature-reducing towers, catalytic oxidation occurs in the environment of oxygen, catalyst and water；Although the liquid-state sulfur purity for solving existing Claus tail gases sulfur removal technology extraction is higher, the tail gas of discharge there is a problem of polluting environment.
Description
Technical field
Concretely it is a kind of Claus tail gases low-temp desulfurization system and work the present invention relates to industrial tail gas desulfuration field
Skill.
Background technology
One of method used by hydrogen sulfide that Claus method is generated when being for removal combustion of fossil fuel and geothermal power generation.It is former
Reason is to make hydrogen sulfide imperfect combustion, then the sulfur dioxide of generation is reacted with hydrogen sulfide and is generated sulphur.If air and vulcanization
Hydrogen mixed proportion is appropriate, and all of hydrogen sulfide can be made to become sulphur and water, and this method removes hydrogen sulfide in being vented in geothermal power generation
When widely use.
Low temperature Claus process is used existing Claus tail gases low-temp desulfurization technique more, using two-stage Cross unit Recovery ratio
It is 95%, the yield of three-level Cross unit reaches 97%~97 .5%, if adding a low-temperature Claus section again later, can
Total sulfur conversion ratio is set to reach more than 99%.
As country is tight to adding for industrial tail gas index, the problem that this method is present is, even across multistage Crouse
Total sulfur content is in 2000~3000ppm in the tail gas that device desulfurization is still discharged, although the liquid-state sulfur purity of extraction is higher, but
It is that the tail gas discharged there is a problem of polluting environment.
Therefore a kind of simple structure is needed, a kind of Claus tail gases low temperature of emission total sulfur content can be greatly reduced
Desulphurization system and technique.
The content of the invention
The present invention is directed to existing Claus tail gases low-temp desulfurization technique, is still arranged even across multistage Cross unit desulfurization
Total sulfur content is in 2000~3000ppm in the tail gas for going out, although the liquid-state sulfur purity of extraction is higher, but the tail gas of discharge is deposited
In the problem of pollution environment, there is provided a kind of Claus tail gases low-temp desulfurization system and technique.
The present invention solves above-mentioned technical problem, and the technical scheme of use is that a kind of Claus tail gases low-temp desulfurization system is wrapped
Include a temperature-reducing tower, absorption tower, absorbent tank, No. two temperature-reducing towers, catalysis oxidizing tower and dilute sulfuric acid recycling cans.Wherein No. one cooling
The air intake of tower is connected with tracheae is entered, and a cooling nozzle for temperature-reducing tower is connected with a cooling water pipe, temperature-reducing tower it is defeated
Mouth is sent to be connected with a delivery pipe, a temperature-reducing tower is connected by a delivery pipe with absorption tower.The sulfur outlet on absorption tower and row
Sulphur pipe is connected, and a delivery port on absorption tower is connected with No. three delivery pipes, and absorption tower is by No. three delivery pipes and No. two temperature-reducing towers
Connection, No. two delivery ports on absorption tower are connected with No. two delivery pipes, and the circulation port on absorption tower is connected with a circulation pipe, absorption tower
Circulation is formed with absorbent tank by No. two delivery pipes and a circulation pipe.No. two cooling nozzles and No. two cooling waters of temperature-reducing tower
Pipe is connected, and No. two delivery ports of temperature-reducing tower are connected with No. four delivery pipes, and No. two temperature-reducing towers pass through No. four delivery pipes and catalysis oxidation
Tower is connected.The blowing mouth of catalysis oxidizing tower is connected with oxygen cathete, and the exhaust outlet of catalysis oxidizing tower is connected with blast pipe, catalysis oxidation
The cooling nozzle of tower is connected with No. three cooling water pipes, and catalysis oxidizing tower is connected by No. five delivery pipes with dilute sulfuric acid recycling can.
Further, a delivery pipe is also connected with No. two absorption towers, and No. two absorption towers pass through No. six delivery pipes and No. two
Circulation pipe and No. two absorbent tanks form circulation, and No. two absorption towers are connected with sulphur discharging pipeline, and No. two absorption towers pass through No. three delivery pipes
Connected with No. two temperature-reducing towers.
Further, a delivery pipe is provided with a control valve, and a control valve is located at a delivery pipe with a drop
The delivery port junction of warm tower, No. three delivery pipes are provided with No. two control valves, and No. two control valves are located at No. three delivery pipes and absorption
A number delivery port junction of tower, sulphur discharging pipeline is provided with No. three control valves, row of No. three control valves located at sulphur discharging pipeline with absorption tower
Sulphur mouthful junction, No. two delivery pipes are provided with solvent circulating pump, and No. four delivery pipes are provided with No. four control valves.No. four control valves set
In No. four delivery pipes and No. two delivery port junctions of temperature-reducing tower, No. five delivery pipes are provided with No. five control valves, are set on blast pipe
There are No. six control valves and air-introduced machine, No. six control valves are located at blast pipe and the exhaust outlet junction of catalysis oxidizing tower.
The purpose of so design is that first industrial tail gas are input in a temperature-reducing tower by entering tracheae when using, then
The industrial tail gas being pointed to by a cooling water pipe in a temperature-reducing tower carry out spraying cooling, and the cooling water after cooling is directly arranged
Go out or process Posterior circle to use, this part is discharged for prior art as cooling water, so repeat no more how the row of setting
Water pipe, when industrial tail gas temperature is reduced to 105 DEG C~115 DEG C, opens a control valve, and the industrial tail gas after cooling pass through one
Number delivery pipe enters absorption tower, and the NaOH liquid catalysts that concentration is 1%~5% are provided with absorption tower, will be in absorbent tank it is poly-
Ethylene glycol is delivered in absorption tower by No. two delivery pipes, the SO in industrial tail gas2Active intermediate complex is formed with catalyst,
Again with the H being dissolved in absorbent2S reaction generation sulphur simple substances, after completion of the reaction by opening No. two control valves, by liquid sulfur list
Matter is discharged from sulphur discharging pipeline.
The remaining complete industrial tail gas composition single order exhaust temperature of unreacted is 120 DEG C~125 DEG C, opens No. three controls
Valve, No. two temperature-reducing towers are delivered to by No. three delivery pipes by single order tail gas, and spraying cooling, single order are carried out based on No. two cooling water pipes
When exhaust temperature is reduced to 65 DEG C~75 DEG C, No. four control valves are opened, be delivered in catalysis oxidizing tower by No. four delivery pipes, urged
CoMoO and AL is provided with change oxidizing tower2O3The solid catalyst of mixture composition, oxygen to catalysis oxidation is conveyed by oxygen cathete
Tower, cooling water is conveyed to catalysis oxidizing tower by No. three cooling water pipes, and single order tail gas occurs oxygen under the catalysis of solid catalyst
Change reduction reaction, generation concentration is 5%~8% dilute sulfuric acid, opens No. five control valves and dilute sulfuric acid is delivered into dilute sulfuric acid recycling can, is opened
No. six control valves are opened to discharge remaining gas.
Meanwhile, a delivery pipe is connected by with No. two absorption towers, can be used alternatingly and suction with absorption tower in use
Agent regeneration is received, when there is claus reaction, absorbent is regenerated in No. two absorption towers on absorption tower, in hair in No. two absorption towers
During raw claus reaction, absorption tower carries out absorbent regeneration, and the operating efficiency of the equipment of greatly improved is used alternatingly.
The present invention solves above-mentioned technical problem, additionally provides a kind of Claus tail gases low-temp desulfurization technique, including two portions
Point, Part I is low-temperature Claus tail-gas low-temp desulfurization, and Part II is catalytic oxidation desulfurization.Wherein Part I low temperature gram
Louth low-temp tail gas desulfurization, comprises the following steps：
The first step, cooling, Claus tail gases obtained in industrial production are passed into a temperature-reducing tower from tracheae is entered, by with
A number cooling water pipe of a number temperature-reducing tower connection carries out spraying cooling, and the Claus tail gases of cooling are obtained；
The Claus tail gases of cooling are delivered to absorption by second step, claus reaction by a delivery pipe from a temperature-reducing tower
In tower, the absorbent in importing absorbent tank by No. two delivery pipes in absorption tower, the Claus tail gases of cooling are urged in liquid
Agent effect is lower to be obtained the solution containing sulphur simple substance and single order tail gas by claus reaction；
3rd step, discharge, the solution containing sulphur simple substance is discharged by sulphur discharging pipeline from absorption tower, and single order tail gas is by No. three conveyings
Pipe is discharged from absorption tower.
Part II catalytic oxidation desulfurization, comprises the following steps：
Be passed into single order tail gas in No. three delivery pipes in No. two temperature-reducing towers by the first step, reducing temperature twice, lowers the temperature by with No. two
No. two cooling water pipes of tower connection carry out spraying cooling, and the single order tail gas of cooling is obtained；
The single order tail gas of cooling is delivered to catalysis by second step, catalytic oxidation by No. four delivery pipes from No. two temperature-reducing towers
In oxidizing tower, oxygen is imported by oxygen cathete in catalysis oxidizing tower, cooling water, the one of cooling are imported by No. three cooling water pipes
There is catalytic oxidation in the solid catalyst in rank tail gas and oxygen, cooling water and catalysis oxidizing tower, be obtained second order tail gas and
Dilute sulfuric acid；
3rd step, discharges again, and dilute sulfuric acid is delivered to dilute sulfuric acid recycling can by No. five delivery pipes, and second order tail gas passes through blast pipe
It is emitted into air.
The purpose of so design is that be down to industrial tail gas below sulphur dew point by spraying cooling by Part I, is occurred
Claus reaction, 4H2S+2SO2→4H2O+3S2, because reaction temperature is low, reaction balance is significantly to the direction of generation sulphur
Move, and the part molten sulfur of generation is deposited on a catalyst immediately.Absorbent, first Claus tail gases are passed through in absorption tower
Middle sulfur dioxide is dissolved in absorbent, and forms active intermediate complex with catalyst, then the sulphur dissolved from tail gas
Change hydrogen reaction generation elementary sulfur, catalyst regenerated, liquid sulfur is in a liquid state discharge, absorbent is recycled, obtained after reaction
To single order tail gas as No. three delivery pipes are discharged.By obtained liquid sulfur purity after Part I treatment in 99% or so, discharge
Single order tail gas total sulfur content in 3000ppm or so, higher than national standard.
Part II, the temperature of tail gas is reduced by spray again, and cooling water, oxygen are passed through in catalysis oxidizing tower,
There is redox reaction, the SO in single order tail gas under the catalysis of solid catalyst2Solid-state is attracted to cooling water and oxygen
In the hole of catalyst, active molecule, simultaneous reactions generation H are changed under the catalytic action of active component2SO4.Catalysis
React the sulfuric acid enrichment of generation in the carrier, water reuse (treatment after sulfuric acid reaches saturation in desulfurization for a period of time hole is discharged
The active sites of catalyst, the desulphurizing ability of catalyst is restored.
The reaction of generation is as follows（* labeled as material absorption on a catalyst）
1）SO2Desulfurization：
SO2→SO2（*）
O2→O2（*）
H2O→H2O（*）
SO2（*）+ O2（*）→SO3（*）
SO3（*）+ H2O（*）→H2SO4（*）
2）Carbonyl desulfurization：（Carbonyl is the acid complex compound of mixing in industrial tail gas）
COS+H2O→H2S+CO2
CS2+2H2O→2H2S+CO2
3）H2S desulfurization：
2H2S+ O2←→2H2O+2/nSn
Wherein, this course of reaction is divided into again, first H2Water in S gases forms one after being adsorbed by solid catalyst on its surface
Layer moisture film.Then H2S and O2Diffuse into solid catalyst surface apertures, H2S is decomposed in moisture film, O2Also by solid catalytic
Agent surface apertures adsorption activation and and H2S reacts.Last O2The active oxygen atom of middle O -- O bond fracture generation also quickly with HS-Instead
S should be generated to be gradually deposited on solid catalyst, finally cooled water is taken away.
By after this series reaction, the sulphion in single order tail gas is significantly converted into dilute sulfuric acid and elemental sulfur, row
Total sulfur content is greatly lowered in the second order tail gas for going out, and finally in 60ppm or so, meets discharging standards.
Further, after the step of Part I low-temperature Claus tail-gas low-temp desulfurization the 3rd, also the 4th step is inhaled agent and is followed
Ring, imports absorbent tank and realizes circulation by a circulation pipe by reacted absorbent from absorption tower.
Further, after the step of Part II catalytic oxidation desulfurization the 3rd, second order tail is treated in also the 4th step, catalyst regeneration
After gas and dilute sulfuric acid discharge are finished, cooling water is conveyed to catalysis oxidizing tower by No. three cooling water pipes, rinse solid catalyst reality
Existing catalyst regeneration.
Optionally, H in Claus tail gases2S and SO2Volume ratio is 2~2.5:1, the dilute sulfuric acid concentration is 5%~8%,
The liquid catalyst is the NaOH that concentration is 1%~5%, and the solid catalyst is CoMoO and AL2O3Mixture, the suction
It is the polyethylene glycol of molecular weight 200~800 to receive agent.
Optionally, the Claus tail gases temperature of cooling be 105 DEG C~115 DEG C, the single order exhaust temperature be 120 DEG C~
125 DEG C, the single order exhaust temperature of the cooling is 65 DEG C~75 DEG C, and the second order exhaust temperature is 60 DEG C~70 DEG C.
The purpose of so design is to change Claus tail gases reaction temperature by the means lowered the temperature, while adding cooling
Water come neutralize redox reaction generation heat, at a suitable temperature in claus reaction by significantly to generation sulphur direction
It is mobile.
Meanwhile, based on H2S and SO2Solubility difference is larger in polyethylene glycol, by adjusting H2S and SO2Content proportioning
The reaction effect of claus reaction is improved, is improved and liquid sulfur content is obtained.
Moreover, by absorbent circulate with catalyst regenerate, polyethylene glycol lytic agent is recycled, CoMoO with
AL2O3Mixture can repeatedly utilize, reduce material waste, saved production cost.
Beneficial effects of the present invention at least include one below；
1st, it is combined with catalytic oxidation by claus reaction, the other total sulfur contents of final discharge is greatly reduced, is allowed to
National emission request can be reached.
2nd, in Part I claus reaction, make claus reaction interval in sulphur Asia dew point by controlling temperature, and then
Reaction balance is significantly moved to the direction of generation sulphur, while by H2S and SO2Volume ratio is controlled 2~2.5:1 makes reaction
Tend to balance.
3rd, by the way that after Part I is discharged, agent circulation step is inhaled in addition, realizes that the recycling of absorbent reduces life
Produce cost.
4th, by after Part II is discharged again, adding process catalyst regeneration step, the recycling reduction of catalyst is realized
Production cost.
5th, it is connected with No. two absorption towers by by a delivery pipe, can be used alternatingly and absorption with absorption tower in use
Agent is regenerated, and when there is claus reaction, absorbent is regenerated in No. two absorption towers on absorption tower, is being occurred in No. two absorption towers
During claus reaction, absorption tower carries out absorbent regeneration, and the operating efficiency of the equipment of greatly improved is used alternatingly.
Brief description of the drawings
Fig. 1 is a kind of Claus tail gases low-temp desulfurization system structure diagram；
Fig. 2 is Claus tail gases low-temp desulfurization structural representation；
Marked in figure：1 is for a delivery pipe, 5 are absorption into tracheae, 2 for a temperature-reducing tower, 3 for a cooling water pipe, 4
Tower, 6 be absorbent tank, 7 be sulphur discharging pipeline, 8 be No. two delivery pipes, 9 be a circulation pipe, 10 be No. three delivery pipes, 11 be No. two
Temperature-reducing tower, 12 be No. two cooling water pipes, 13 be No. four delivery pipes, 14 be catalysis oxidizing tower, 15 be oxygen cathete, 16 be No. three coolings
Water pipe, 17 be No. five delivery pipes, 18 be blast pipe, 19 be dilute sulfuric acid recycling can, 20 be solvent circulating pump, 21 be air-introduced machine, 22
For a control valve, 23 be No. two control valves, 24 be No. three control valves, 25 be No. four control valves, 26 for No. five control valves, 27 are
No. six control valves, 28 be No. two absorption towers, 29 be No. six delivery pipes, 30 be No. two circulation pipes, 31 be No. two absorbent tanks.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention can become apparent from understanding, below in conjunction with accompanying drawing and implementation
The present invention will be described in further detail for example.It should be appreciated that specific embodiment described herein is only used to explain this hair
It is bright, it is not intended to limit the present invention protection content.
In the description of the invention, it is to be understood that term " one end ", " center ", " circumference ", " on ", " inner side ",
The orientation or position relationship of the instruction such as " outside ", " other end ", " middle part ", " top ", " side " are based on side shown in the drawings
Position or position relationship, are for only for ease of the description present invention and are described with simplified, rather than the device or unit that indicate or imply meaning
Part with specific orientation, with specific azimuth configuration and operation, therefore must be not considered as limiting the invention.
Embodiment 1
As shown in figure 1, a kind of Claus tail gases low-temp desulfurization system structure diagram, a kind of Claus tail gases low-temp desulfurization system
Including a temperature-reducing tower 2, absorption tower 5, absorbent tank 6, No. two temperature-reducing towers 11, catalysis oxidizing tower 14 and dilute sulfuric acid recycling cans 19,
Wherein No. one temperature-reducing tower 2 respectively with enter tracheae 1 and a cooling water pipe 3 is connected, and connected by a delivery pipe 4 and absorption tower 5
Logical, absorption tower 5 is connected with sulphur discharging pipeline 7, and absorption tower 5 is connected by No. three delivery pipes 10 with No. two temperature-reducing towers 11, and absorption tower 5 passes through
No. two delivery pipes 8 and a circulation pipe 9 form circulation with absorbent tank 6.No. two temperature-reducing towers 11 are connected with No. two cooling water pipes 12,
And connected with catalysis oxidizing tower 14 by No. four delivery pipes 13, catalysis oxidizing tower 14 respectively with oxygen cathete 15, blast pipe 18 and three
Number cooling water pipe 16 is connected, and catalysis oxidizing tower 14 is connected by No. five delivery pipes 17 with dilute sulfuric acid recycling can 19.A number delivery pipe 4
A control valve 22 is provided with, a control valve 22 is located at a delivery pipe 4 and a junction of temperature-reducing tower 2.No. three delivery pipes
10 are provided with No. two control valves 23, and No. two control valves 23 set located at No. three delivery pipes 10 and the junction of absorption tower 5 on sulphur discharging pipeline 7
There are No. three control valves 24, No. three control valves 24 are provided with solvent and follow located at sulphur discharging pipeline 7 and the junction of absorption tower 5, No. two delivery pipes 8
Ring pump 20, solvent circulating pump 20 is provided with No. four controls located at No. two delivery pipes 8 and the junction of absorption tower 5, No. four delivery pipes 13
Valve 25.No. four control valves 25 are located at No. four delivery pipes 13 and No. two junctions of temperature-reducing tower 11, and No. five delivery pipes 17 are provided with No. five
Control valve 26, blast pipe 18 is provided with No. six control valves 27 and air-introduced machine 21, and No. six control valves 27 are located at blast pipe 18 and catalysis
The junction of oxidizing tower 14.
When using, first industrial tail gas are input in a temperature-reducing tower by entering tracheae, then by a cooling water pipe pair
Industrial tail gas in a temperature-reducing tower carry out spraying cooling, and the cooling water after cooling is expelled directly out or processes Posterior circle to be made
With, this part is discharged for prior art as cooling water, so repeat no more how to set drainpipe, treat industrial tail gas temperature
When being reduced to 105 DEG C~115 DEG C, a control valve is opened, the industrial tail gas after cooling enter absorption tower by a delivery pipe,
The NaOH liquid catalysts that concentration is 1%~5% are provided with absorption tower, the polyethylene glycol in absorbent tank is passed through into No. two delivery pipes
It is delivered in absorption tower, the SO in industrial tail gas2Form active intermediate complex with catalyst, then be dissolved in absorbent
H2S reaction generation sulphur simple substances, after completion of the reaction by opening No. two control valves, liquid sulphur simple substance are discharged from sulphur discharging pipeline.It is remaining
The complete industrial tail gas composition single order exhaust temperature of unreacted is 120 DEG C~125 DEG C, opens No. three control valves, defeated by No. three
Send pipe that single order tail gas is delivered into No. two temperature-reducing towers, spraying cooling, the reduction of single order exhaust temperature are carried out based on No. two cooling water pipes
During to 65 DEG C~75 DEG C, No. four control valves are opened, be delivered in catalysis oxidizing tower by No. four delivery pipes, set in catalysis oxidizing tower
There is CoMoO and AL2O3The solid catalyst of mixture composition, oxygen is conveyed to catalysis oxidizing tower by oxygen cathete, cold by No. three
But water pipe conveys cooling water to catalysis oxidizing tower, and single order tail gas occurs redox reaction under the catalysis of solid catalyst, raw
It is 5%~8% dilute sulfuric acid into concentration, opens No. five control valves and dilute sulfuric acid is delivered to dilute sulfuric acid recycling can, opens No. six control valves
By the discharge of remaining gas.
Embodiment 2
Based on embodiment 1, a delivery pipe 4 is also connected with No. two absorption towers 28, and No. two absorption towers 28 pass through No. six delivery pipes 29
Circulation is formed with No. two circulation pipes 30 and No. two absorbent tanks 31, No. two absorption towers 28 are connected with sulphur discharging pipeline 7, No. two absorption towers 28
Connected with No. two temperature-reducing towers 11 by No. three delivery pipes 10.
When using, a delivery pipe is connected by with No. two absorption towers, in use can with absorption tower be used alternatingly with
Absorbent regeneration, absorption tower occur claus reaction when, absorbent is regenerated in No. two absorption towers, in No. two absorption towers
During generation claus reaction, absorption tower carries out absorbent regeneration, and the operating efficiency of the equipment of greatly improved is used alternatingly.
Embodiment 3
A kind of Claus tail gases low-temp desulfurization technique, including two parts, Part I is low-temperature Claus tail-gas low-temp desulfurization,
Part II is catalytic oxidation desulfurization.
Part I low-temperature Claus tail-gas low-temp desulfurization, comprises the following steps：
The first step, cooling, Claus tail gases obtained in industrial production are passed into a temperature-reducing tower 2 from tracheae 1 is entered, and are passed through
A cooling water pipe 3 being connected with a temperature-reducing tower 2 carries out spraying cooling, and the Claus tail gases of cooling are obtained；
The Claus tail gases of cooling are delivered to suction by second step, claus reaction by a delivery pipe 4 from a temperature-reducing tower 2
Receive in tower 5, the absorbent in importing absorbent tank 6 by No. two delivery pipes 8 in absorption tower 5, the Claus tail gases of cooling exist
Liquid catalyst effect is lower to be obtained the solution containing sulphur simple substance and single order tail gas by claus reaction；
3rd step, discharge, the solution containing sulphur simple substance is discharged by sulphur discharging pipeline 7 from absorption tower 5, and single order tail gas is defeated by No. three
Pipe 10 is sent to be discharged from absorption tower 5.
4th step, inhales agent circulation, and reacted absorbent is imported into absorbent from absorption tower 5 by a circulation pipe 9
Tank 6 realizes circulation.
Part II catalytic oxidation desulfurization, comprises the following steps：
Be passed into single order tail gas in No. three delivery pipes 10 in No. two temperature-reducing towers 11 by the first step, reducing temperature twice, by with No. two
No. two cooling water pipes 12 of the connection of temperature-reducing tower 11 carry out spraying cooling, and the single order tail gas of cooling is obtained；
By No. four delivery pipes 13 be delivered to the single order tail gas of cooling from No. two temperature-reducing towers 11 by second step, catalytic oxidation
In catalysis oxidizing tower 14, oxygen is imported by oxygen cathete 15 in catalysis oxidizing tower 14, imported by No. three cooling water pipes 16 cold
There is catalytic oxidation in but water, single order tail gas and the solid catalyst in oxygen, cooling water and catalysis oxidizing tower 14 of cooling,
Second order tail gas and dilute sulfuric acid is obtained；
3rd step, discharges again, and dilute sulfuric acid is delivered to dilute sulfuric acid recycling can 19 by No. five delivery pipes 17, and second order tail gas is by row
Tracheae 18 is emitted into air.
4th step, catalyst regeneration, after second order tail gas and dilute sulfuric acid discharge are finished, by No. three cooling water pipes 16 to urging
Change the conveying cooling water of oxidizing tower 14, rinse solid catalyst and realize that catalyst regenerates.
The obtained industrial tail gas of collection, wherein it is 2% to enter total sulfur content in tracheae, the single order tail gas total sulfur of discharge contains
It is 3000ppm or so to measure, and other total sulfur contents from blast pipe discharge are near 60ppm, to meet National Industrial waste gas discharge total
Sulfur content is less than 200ppm requirements.
Claims (10)
1. a kind of Claus tail gases low-temp desulfurization system, it is characterised in that：Including a temperature-reducing tower（2）, absorption tower（5）, absorb
Agent tank（6）, No. two temperature-reducing towers（11）, catalysis oxidizing tower（14）With dilute sulfuric acid recycling can（19）, a temperature-reducing tower（2）Enter
Gas port with enter tracheae（1）Connection, a temperature-reducing tower（2）Cooling nozzle and a cooling water pipe（3）Connection, a temperature-reducing tower
（2）Delivery port and a delivery pipe（4）Connection, a temperature-reducing tower（2）By a delivery pipe（4）With absorption tower（5）Connection,
The absorption tower（5）Sulfur outlet and sulphur discharging pipeline（7）Connection, absorption tower（5）A delivery port and No. three delivery pipes（10）Even
Connect, absorption tower（5）By No. three delivery pipes（10）With No. two temperature-reducing towers（11）Connection, absorption tower（5）No. two delivery ports and two
Number delivery pipe（8）Connection, absorption tower（5）Circulation port and a circulation pipe（9）Connection, absorption tower（5）By No. two delivery pipes
（8）With a circulation pipe（9）With absorbent tank（6）Form circulation, No. two temperature-reducing towers（11）Cooling nozzle it is cold with No. two
But water pipe（12）Connection, No. two temperature-reducing towers（11）Delivery port and No. four delivery pipes（13）Connection, No. two temperature-reducing towers（11）Pass through
No. four delivery pipes（13）With catalysis oxidizing tower（14）Connection, the catalysis oxidizing tower（14）Blowing mouth and oxygen cathete（15）Even
Connect, catalysis oxidizing tower（14）Exhaust outlet and blast pipe（18）Connection, catalysis oxidizing tower（14）Cooling nozzle and No. three cooling
Water pipe（16）Connection, catalysis oxidizing tower（14）By No. five delivery pipes（17）With dilute sulfuric acid recycling can（19）Connection.
2. a kind of Claus tail gases low-temp desulfurization system according to claim 1, it is characterised in that：A number delivery pipe
（4）Also with No. two absorption towers（28）Connection, No. two absorption towers（28）By No. six delivery pipes（29）With No. two circulation pipes
（30）With No. two absorbent tanks（31）Form circulation, No. two absorption towers（28）With sulphur discharging pipeline（7）Connection, No. two absorption towers（28）It is logical
Cross No. three delivery pipes（10）With No. two temperature-reducing towers（11）Connection.
3. a kind of Claus tail gases low-temp desulfurization system according to claim 2, it is characterised in that：A number delivery pipe
（4）It is provided with a control valve（22）, a control valve（22）Positioned at a delivery pipe（4）With a temperature-reducing tower（2）'s
Delivery port junction, No. three delivery pipes（10）It is provided with No. two control valves（23）, No. two control valves（23）Located at three
Number delivery pipe（10）With absorption tower（5）A delivery port junction, the sulphur discharging pipeline（7）It is provided with No. three control valves（24）,
No. three control valves（24）Located at sulphur discharging pipeline（7）With absorption tower（5）Sulfur outlet junction, No. two delivery pipes（8）On
It is provided with solvent circulating pump（20）, No. four delivery pipes（13）It is provided with No. four control valves（25）, No. four control valves（25）
Located at No. four delivery pipes（13）With No. two temperature-reducing towers（11）Delivery port junction, No. five delivery pipes（17）It is provided with No. five
Control valve（26）, the blast pipe（18）It is provided with No. six control valves（27）And air-introduced machine（21）, No. six control valves（27）
Located at blast pipe（18）With catalysis oxidizing tower（14）Exhaust outlet junction.
4. a kind of Claus tail gases low-temp desulfurization technique, it is characterised in that including two parts, Part I is low-temperature Claus
Tail gas desulfurization, Part II is catalytic oxidation desulfurization.
5. a kind of Claus tail gases low-temp desulfurization technique according to claim 4, it is characterised in that：The Part I is low
Warm Claus tail gases desulfurization, comprises the following steps：
The first step, cooling, by Claus tail gases obtained in industrial production from entering tracheae（1）In be passed into a temperature-reducing tower（2）In,
By with a temperature-reducing tower（2）A number cooling water pipe of connection（3）Spraying cooling is carried out, the Claus tail gases of cooling are obtained；
The Claus tail gases lowered the temperature are passed through a delivery pipe by second step, claus reaction（4）From a temperature-reducing tower（2）Conveying
To absorption tower（5）In, on absorption tower（5）In pass through No. two delivery pipes（8）Import absorbent tank（6）In absorbent, cooling
Claus tail gases are obtained the solution containing sulphur simple substance and single order tail gas under liquid catalyst effect by claus reaction；
3rd step, discharge, the solution containing sulphur simple substance passes through sulphur discharging pipeline（7）From absorption tower（5）Middle discharge, single order tail gas passes through three
Number delivery pipe（10）From absorption tower（5）Middle discharge.
6. a kind of Claus tail gases low-temp desulfurization technique according to claim 5, it is characterised in that：After 3rd step,
Also the 4th step, inhales agent circulation, and reacted absorbent is passed through into a circulation pipe（9）From absorption tower（5）Import absorbent
Tank（6）Realize circulation.
7. a kind of Claus tail gases low-temp desulfurization technique according to claim 5, it is characterised in that：The Part II is urged
Change oxidation sweetening, comprise the following steps：
The first step, reducing temperature twice, by No. three delivery pipes（10）In single order tail gas be passed into No. two temperature-reducing towers（11）In, by with
No. two temperature-reducing towers（11）No. two cooling water pipes of connection（12）Spraying cooling is carried out, the single order tail gas of cooling is obtained；
The single order tail gas lowered the temperature is passed through No. four delivery pipes by second step, catalytic oxidation（13）From No. two temperature-reducing towers（11）It is defeated
Deliver to catalysis oxidizing tower（14）In, in catalysis oxidizing tower（14）In pass through oxygen cathete（15）Oxygen is imported, by No. three cooling waters
Pipe（16）Import cooling water, single order tail gas and oxygen, cooling water and the catalysis oxidizing tower of cooling（14）In solid catalyst hair
Raw catalytic oxidation, is obtained second order tail gas and dilute sulfuric acid；
3rd step, discharges again, and dilute sulfuric acid passes through No. five delivery pipes（17）It is delivered to dilute sulfuric acid recycling can（19）, second order tail gas lead to
Cross blast pipe（18）It is emitted into air.
8. a kind of Claus tail gases low-temp desulfurization technique according to claim 7, it is characterised in that：After 3rd step,
Also the 4th step, catalyst regeneration, after second order tail gas and dilute sulfuric acid discharge are finished, by No. three cooling water pipes（16）To catalysis
Oxidizing tower（14）Conveying cooling water, rinses solid catalyst and realizes that catalyst regenerates.
9. a kind of Claus tail gases low-temp desulfurization technique according to claim 7, it is characterised in that：The Ke Lao of the cooling
This exhaust temperature is 105 DEG C~115 DEG C, and the single order exhaust temperature is 120 DEG C~125 DEG C, the single order tail gas temperature of the cooling
It is 65 DEG C~75 DEG C to spend, and the second order exhaust temperature is 60 DEG C~70 DEG C.
10. a kind of Crouse's low temperature exhaust gas sulfur removal technology according to claim 7, it is characterised in that：Crouse's tail
H in gas2S and SO2Volume ratio is 2~2.5:1, the dilute sulfuric acid concentration is 5%~8%, and the liquid catalyst is 1% for concentration
~5% NaOH, the solid catalyst is CoMoO and AL2O3It is in proportion 1:Obtained mixture, the absorption after 2 mixing
Agent is the polyethylene glycol of molecular weight 200~800.
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| CN112657331A (en) * | 2020-12-31 | 2021-04-16 | 成都达奇环境科技有限公司 | Flue gas desulfurization method and flue gas desulfurization equipment |
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