CN105480951A - Liquid sulfur degassing system and liquid sulfur degassing method - Google Patents
Liquid sulfur degassing system and liquid sulfur degassing method Download PDFInfo
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- CN105480951A CN105480951A CN201610016759.8A CN201610016759A CN105480951A CN 105480951 A CN105480951 A CN 105480951A CN 201610016759 A CN201610016759 A CN 201610016759A CN 105480951 A CN105480951 A CN 105480951A
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- tail gas
- sulphur
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- molten sulfur
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/02—Preparation of sulfur; Purification
- C01B17/04—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides
- C01B17/0404—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by processes comprising a dry catalytic conversion of hydrogen sulfide-containing gases, e.g. the Claus process
- C01B17/0413—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by processes comprising a dry catalytic conversion of hydrogen sulfide-containing gases, e.g. the Claus process characterised by the combustion step
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/02—Preparation of sulfur; Purification
- C01B17/04—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides
- C01B17/0404—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by processes comprising a dry catalytic conversion of hydrogen sulfide-containing gases, e.g. the Claus process
- C01B17/0426—Preparation of sulfur; Purification from gaseous sulfur compounds including gaseous sulfides by processes comprising a dry catalytic conversion of hydrogen sulfide-containing gases, e.g. the Claus process characterised by the catalytic conversion
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention provides a liquid sulfur degassing system and a liquid sulfur degassing method. The degassing system comprises a liquid sulfur tank, a sulfur production reaction unit, a tail gas incinerator and a compressor, wherein the liquid sulfur tank is provided with a sulfur-containing exhaust gas outlet, and the sulfur-containing exhaust gas outlet is used for discharging sulfur-containing exhaust gas in the liquid sulfur tank; the sulfur production reaction unit is provided with a sulfur-containing exhaust gas inlet and a desulfurization tail gas outlet, used for producing the sulfur-containing exhaust gas into sulfur elementary substances and communicated with the liquid sulfur tank; the tail gas incinerator is provided with a desulfurization tail gas inlet and a purified tail gas outlet, and the desulfurization tail gas inlet is communicated with the desulfurization tail gas outlet of the sulfur production reaction unit; the compressor is arranged between the liquid sulfur tank and the sulfur production reaction unit, communicated with the liquid sulfur tank through the sulfur-containing exhaust gas outlet and communicated with the sulfur production reaction unit through the sulfur-containing exhaust gas inlet. The sulfur production reaction unit and the compressor are arranged between the liquid sulfur tank and the tail gas incinerator, so that the sulfur-containing exhaust gas released from the liquid sulfur tank is re-converted into the sulfur elementary substances through the sulfur production reaction unit and then incinerated through the tail gas incinerator, the discharge capacity of sulfur in tail gas can be reduced, environmental pollution is alleviated, and the sulfur recovery rate is raised.
Description
Technical field
The present invention relates to coal chemical technology, in particular to a kind of molten sulfur degasification system and molten sulfur degasification method.
Background technology
Sulfur recovery unit in process of production, has part H
2s gas dissolving in Molten sulphur (molten sulfur), this part dissolve H
2s meeting loss in packaging moulding process out, will damage or even injures and deaths operator like this, therefore in technical process, be provided with molten sulfur degasification unit.
Traditional molten sulfur degasification flow process is: as shown in Figure 1, the Molten sulphur that sulfur recovery unit sulphur part producing goes out flow into molten sulfur pond 1 ' by self gravitation, in molten sulfur pond 1 ', gas ammonia (as catalyzer) is injected by gas ammonia source line 11 ', spray after molten sulfur lift pump 12 ' supercharging again, will the H in Molten sulphur be dissolved in
2s separates.The H separated
2s gas is taken out storage 13 ' by steam and is delivered to tail gas burning furnace 3 ', generates the SO that toxicity is less after high temperature incineration
2afterwards, then through vapor superheater 23 ' and exhaust gas heat recovery boiler 32 ', be just directly drained in air by chimney 10 '.
Aforesaid liquid sulphur removes the waste gas of discharging after degassed, and just just directly enter in air after high temperature incineration, the waste gas discharged without recycling measure like this can cause great pollution to environment.In the atmosphere pollutants emission standards that country is existing, for SO in flue gas
2content requirement lower than 980mg/Nm
3.From the running condition of same device, above-mentioned waste gas is approximately 100mg/Nm to the contribution of sulfureous in flue gas content
3, account for 1/9 of sulphur emissions total amount.
Along with country is to the attention gradually of environmental protection aspect, atmosphere pollutants emission standards also increasingly strict, reduces pollutant emission imperative.Under this general orientation, the comprehensive regulation and recovery must be carried out to the waste gas removed in Molten sulphur.Therefore, be badly in need of improving molten sulfur degasification unit of the prior art, to provide a kind of efficient sulfur recovery method newly, reduce environmental pollution.
Summary of the invention
Main purpose of the present invention is to provide a kind of molten sulfur degasification system and molten sulfur degasification method, low to solve the removal efficiency of sulphur-containing exhaust gas in prior art, the defect that sulphur dioxide emission are high.
To achieve these goals, according to an aspect of the present invention, provide one and provide a kind of molten sulfur degasification system, this degas system comprises: molten sulfur pond, has sulphur-containing exhaust gas outlet, in order to discharge the sulphur-containing exhaust gas in molten sulfur pond; Reaction of Salmon-Saxl unit processed, is connected with molten sulfur pond, and reaction of Salmon-Saxl unit processed has sulphur-containing exhaust gas entrance and desulfidation tail gas outlet, in order to sulphur-containing exhaust gas is made sulphur simple substance; Tail gas burning furnace, has desulfidation tail gas entrance and cleaning of off-gas relief outlet, and desulfidation tail gas entrance exports with desulfidation tail gas and is connected; And compressor, be arranged between molten sulfur pond and reaction of Salmon-Saxl unit processed, be connected with molten sulfur pond by sulphur-containing exhaust gas outlet, and be connected with reaction of Salmon-Saxl unit processed by sulphur-containing exhaust gas entrance.
Further, reaction of Salmon-Saxl unit processed comprises: burner for producing sulfur; Sulphur waste heat boiler processed, burner for producing sulfur and sulphur waste heat boiler processed are arranged in same housing; Three grades of condensers, three grades of condensers comprise first step condenser, second stage condenser and third stage condenser; Secondary reformer, secondary reformer comprises first step convertor and second stage convertor; And process heat exchangers, process heat exchangers comprises process heat exchangers tube side and process heat exchangers shell side; Wherein, sulphur waste heat boiler processed is connected with third stage condenser via first step condenser, first step convertor, process heat exchangers tube side, second stage condenser, process heat exchangers shell side, second stage convertor successively; Third stage condenser is connected with tail gas burning furnace by the first waste heat recovery pipeline.
Further, burner for producing sulfur is provided with pyroprocess gas vent pipe, and pyroprocess gas vent pipe is provided with high temperature blending valve, and high temperature blending valve is positioned on the pipeline between first step condenser and first step convertor.
Further, reaction of Salmon-Saxl unit processed also comprises: sulphur sealed cans and tail gas divide flow container, sulphur sealed cans are connected with first step condenser respectively by the first condensate drain line, be connected with second stage condenser by the second condensate drain line, and are connected with third stage condenser by the 3rd condensate drain line.
Further, tail gas divides flow container to be connected with third stage condenser by sulphur exhaust emission tube line processed.
Further, degas system also comprises: tail gas hydrogenation reaction member, comprises the heater exhaust gas, hydrogenator, vapour generator and the tail gas quenching tower that are connected successively; Tail gas quenching top of tower is provided with chilling tail gas relief outlet; And tail gas absorber, be connected with tail gas quenching tower by chilling tail gas relief outlet; Wherein, tail gas hydrogenation reaction member is connected with reaction of Salmon-Saxl unit processed by desulfidation tail gas outlet, and tail gas absorber is connected with tail gas burning furnace by desulfidation tail gas entrance; Heater exhaust gas is connected with tail gas burning furnace by the second waste heat recovery pipeline.
Further, online hydrogen analyzer is provided with between hydrogenator and vapour generator.
Further, tail gas quenching tower top is provided with quenched water entrance, and bottom is provided with quenched water outlet; Quenched water entrance is exported with quenched water and is connected by quenched water circulation line.
Further, according to the loop direction of quenched water on quenched water circulation line, be disposed with chilling water pump, strainer and quenched water water cooler.
Further, molten sulfur pond also comprises: gas ammonia source line, and it is inner that the roof via molten sulfur pond passes into molten sulfur pond; Molten sulfur lift pump, is arranged on molten sulfur pond inner; And evacuation, be provided with sulfur-bearing and promote liquid entrance and sulphur-containing exhaust gas outlet, sulfur-bearing is promoted liquid entrance and is connected with molten sulfur lift pump by sulphur-bearing waste solution lift line.
Further, evacuation is also provided with steam-in, for passing into steam in evacuation.
To achieve these goals, according to a further aspect in the invention, provide molten sulfur degasification method, this degas method comprises and utilizes any one degas system above-mentioned to remove the sulphur-containing exhaust gas in molten sulfur, is purified tail gas.
Further, the SO in cleaning of off-gas
2content be less than or equal to 884mg/Nm
3.
Apply technical scheme of the present invention, by arranging reaction of Salmon-Saxl unit processed between existing molten sulfur pond and tail gas burning furnace, again sulphur simple substance is converted to through reaction of Salmon-Saxl device processed by the sulphur-containing exhaust gas removed in molten sulfur pond, and then through tail gas burning furnace, the rate of recovery of sulphur in sulphur-containing exhaust gas can not only be improved, and the quantity discharged of sulphur in tail gas can be reduced, lower environmental pollution.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the schematic diagram of molten sulfur degasification system of the prior art;
Fig. 2 shows the molten sulfur degasification system that a kind of preferred embodiment of the present invention provides; And
Fig. 3 shows the molten sulfur degasification system that the another kind of preferred embodiment of the present invention provides.
Wherein, above-mentioned accompanying drawing comprises the following drawings mark:
1 ', molten sulfur pond; 11 ', gas ammonia source line; 12 ', molten sulfur lift pump; 13 ', steam takes out storage; 3 ', tail gas burning furnace; 23 ', vapor superheater; 32 ', exhaust gas heat recovery boiler; 10 ', chimney;
1, molten sulfur pond; 2, reaction of Salmon-Saxl unit processed; 3, tail gas burning furnace; 4, compressor; 5, tail gas hydrogenation reaction member; 6, tail gas absorber;
11, gas ammonia source line; 12, molten sulfur lift pump; 13, evacuation;
21, burner for producing sulfur; 22, sulphur waste heat boiler processed; 24, three grades of condensers; 25, secondary reformer; 26, process heat exchangers; 27, high temperature blending valve; 28, tail gas divides flow container;
51, heater exhaust gas; 52, hydrogenator; 53, vapour generator; 54, tail gas quenching tower.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.The present invention is described in detail below in conjunction with embodiment.
Along with country is to the attention gradually of environmental protection aspect, atmosphere pollutants emission standards also increasingly strict, reduces pollutant emission imperative.Under this general orientation, the comprehensive regulation and recovery must be carried out to the waste gas removed in Molten sulphur.
To achieve these goals, propose a kind of molten sulfur degasification system in the present embodiment, as shown in Figure 2, this degas system comprises: molten sulfur pond 1, reaction of Salmon-Saxl unit 2 processed, tail gas burning furnace 3 and compressor 4; Molten sulfur pond 1 has sulphur-containing exhaust gas outlet, in order to discharge the sulphur-containing exhaust gas in molten sulfur pond 1; Reaction of Salmon-Saxl unit 2 processed has sulphur-containing exhaust gas entrance and desulfidation tail gas outlet, and in order to sulphur-containing exhaust gas is made sulphur simple substance, reaction of Salmon-Saxl unit 2 processed is connected with molten sulfur pond 1; Tail gas burning furnace 3 has desulfidation tail gas entrance and cleaning of off-gas relief outlet, and desulfidation tail gas entrance exports with the desulfidation tail gas of reaction of Salmon-Saxl unit 2 processed and is connected; Compressor 4 is arranged between molten sulfur pond 1 and reaction of Salmon-Saxl unit 2 processed, is connected, and is connected with reaction of Salmon-Saxl unit 2 processed by sulphur-containing exhaust gas entrance by sulphur-containing exhaust gas outlet with molten sulfur pond 1.
The degas system of application the present embodiment, the sulphur-containing exhaust gas that in molten sulfur pond 1, Molten sulphur is discharged, after compressor 4 pressurizes, sends into reaction of Salmon-Saxl unit 2 processed.By reaction of Salmon-Saxl unit 2 processed, the element sulphur in sulphur-containing exhaust gas is converted into Molten sulphur, and then removes from waste gas and reclaim, thus improves the organic efficiency of element sulphur in sulphur-containing exhaust gas, efficiently reduces sulphur content in waste gas.The desulfidation tail gas that reaction of Salmon-Saxl unit 2 processed produces by tail-gas combustion stove process, then is disposed in air, SO in discharge flue gas
2content is low, effectively reduces environmental pollution.
In the present embodiment, reaction of Salmon-Saxl unit 2 processed comprises: burner for producing sulfur 21, sulphur waste heat boiler processed 22, three grades of condensers 24, secondary reformer 25 and process heat exchangers 26.Wherein, burner for producing sulfur 21 and sulphur waste heat boiler 22 processed are arranged in same housing; Be connected with tail gas burning furnace 3 by the first waste heat recovery pipeline; Three grades of condensers 24 comprise first step condenser, second stage condenser and third stage condenser; Secondary reformer 25 comprises first step convertor and second stage convertor; Process heat exchangers 26 comprises process heat exchangers tube side and process heat exchangers shell side.Sulphur waste heat boiler 22 processed is connected with third stage condenser via first step condenser, first step convertor, process heat exchangers tube side, second stage condenser, process heat exchangers shell side, second stage convertor successively.
In the present embodiment, burner for producing sulfur 21 is provided with pyroprocess gas vent pipe, and pyroprocess gas vent pipe is provided with high temperature blending valve 27, and on the pipeline of high temperature blending valve 27 between first step condenser and first step convertor.
In the present embodiment, reaction of Salmon-Saxl unit 2 processed also comprises: sulphur sealed cans and tail gas divide flow container 28, sulphur sealed cans are connected with first step condenser respectively by the first condensate drain line, be connected with second stage condenser by the second condensate drain line, and are connected with third stage condenser by the 3rd condensate drain line.
Preferably, tail gas divides flow container 28 to be connected with third stage condenser by sulphur exhaust emission tube line processed.
The working process of reaction of Salmon-Saxl unit 2 processed is as follows:
The Molten sulphur that sulfur recovery unit sulphur part producing goes out is from flowing to molten sulfur pond 1, the waste gas that molten sulfur removes enters burner for producing sulfur 21 and carries out burn processing after compressor 4 pressurizes, during burning, required oxygen is provided by process air and outer oxygen supply, enters stove air capacity and passes through into stove sour gas and the ratio and the H that enter stove air
2s/SO
2on line analyzer feedback data strictly controls.NH in burner for producing sulfur 21 inner acidic gas
3decomposition oxidized with hydrocarbon component, and wherein account for the H of 1/3 volume
2s burns into SO
2, then SO
2and H
2there is high temperature claus reaction in S, about 60 ~ 65% change into elemental sulfur and are present in pyroprocess gas.
From the pyroprocess gas that burner for producing sulfur 21 is discharged, small portion is by the temperature in of high-temp mixing valve regulation first step convertor, major part enters sulphur waste heat boiler 22 processed, 4.1MPa (G) saturation steam is produced with the waste heat of Process Gas, and Process Gas temperature is down to 300 ~ 400 DEG C and is entered first step condenser and be cooled to 150 ~ 160 DEG C, elemental sulfur in Process Gas is condensed into Molten sulphur, Molten sulphur under first step condenser tube side outlet condensation is separated with Process Gas, enters sulphur sealed cans from bottom.
The first step condenser tube side outlet Process Gas of 150 ~ 160 DEG C, after being mixed with the pyroprocess gas of 1000 ~ 1100 DEG C by high-temp mixing valve, temperature reaches 210 ~ 230 DEG C, enters first step convertor, under the effect of catalyzer, the H in Process Gas
2s and SO
2be converted into elemental sulfur.Reacted gas temperature is 300 ~ 320 DEG C, enters process heat exchangers tube side, then through condenser heat exchange to 150 ~ 160 DEG C, the second stage, the elemental sulfur in Process Gas is condensed into Molten sulphur.The Molten sulphur that second stage condenser condenses is got off is separated with Process Gas in tube side outlet, flows out enter sulphur sealed cans from bottom.
Process Gas after separation again return course heat exchanger shell pass (be arranged on the heat control valve between process heat exchangers and second stage convertor, the temperature in of second stage convertor can be regulated) enters second stage convertor to 220 ~ 240 DEG C.Under the effect of catalyzer, remaining H in Process Gas
2s and SO
2be further converted to elemental sulfur.Reacted Process Gas enters third stage condenser and is cooled to 150 ~ 160 DEG C, and the elemental sulfur in Process Gas is condensed into Molten sulphur further.The Molten sulphur that third stage condenser condenses is got off is separated with Process Gas in tube side outlet, flows out enter sulphur sealed cans from bottom.Enter tail gas from third stage condenser sulphur tail gas processed out and divide flow container 28, divide after flow container 28 separatory enter vent gas treatment part through tail gas, tail gas divides flow container 28 Molten sulphur that condensation is got off to flow out from bottom to enter sulphur sealed cans.
Application the present embodiment, is rich in H by high temperature claus reaction in burner for producing sulfur 21 and first step convertor and second stage convertor conversion processing
2the waste gas of S, is converted into sulphur simple substance by the element sulphur in waste gas effectively, by conversion and the reaction of secondary reformer 25, improves the transformation efficiency of element sulphur in waste gas.Meanwhile, in reaction of Salmon-Saxl unit 2 processed, be provided with three grades of condensers 24.By the cooling condensation effect of condenser, the sulphur simple substance in Process Gas is condensed into Molten sulphur and is separated with Process Gas, enters sulphur sealed cans.In this process, the conversion rate of recovery of sulphur is up to about 96%, has effectively reclaimed the element sulphur in waste gas, reduces the sulphur content in waste gas, thus decreases the pollution of waste gas to environment.
In the present embodiment, reaction of Salmon-Saxl unit 2 processed comprises sulphur waste heat boiler 22 processed, high-temp mixing valve and process heat exchangers 26.Sulphur waste heat boiler 22 processed, high-temp mixing valve and process heat exchangers 26 utilize the waste heat produced in degas system operational process to carry out temperature adjustment to Process Gas, for the conversion removal process of element sulphur in sulphur-containing exhaust gas provides suitable temperature, thus the energy consumption reduced for heating in degas system operational process, decrease environmental pollution.
In the present embodiment, tail gas divides flow container 28 by expanding, and makes the elemental sulfur carried secretly in Process Gas change Molten sulphur and other gas delivery into, carries out molten sulfur recovery further, improves Recovery ratio, reduces sulphur tail gas sulphur content processed.
In the present embodiment, as shown in Figure 3, above-mentioned degas system also comprises: tail gas hydrogenation reaction member 5 and tail gas absorber 6.Tail gas hydrogenation reaction member 5 comprises the heater exhaust gas 51, hydrogenator 52, vapour generator 53 and the tail gas quenching tower 54 that are connected successively; Tail gas quenching tower 54 top is provided with chilling tail gas relief outlet; Tail gas absorber 6 is connected with tail gas quenching tower 54 by chilling tail gas relief outlet; Tail gas hydrogenation reaction member 5 is connected with reaction of Salmon-Saxl unit 2 processed by desulfidation tail gas outlet, and tail gas absorber 6 is connected with tail gas burning furnace 3 by desulfidation tail gas entrance; Heater exhaust gas 51 is connected with tail gas burning furnace 3 by the second waste heat recovery pipeline.
In the present embodiment, online hydrogen analyzer is provided with between above-mentioned hydrogenator 52 and vapour generator 53; Tail gas quenching tower 54 top is provided with quenched water entrance, and bottom is provided with quenched water outlet, and wherein, quenched water outlet is connected with quenched water entrance via chilling water pump, strainer, quenched water water cooler.
Divide flow container 28 sulphur tail gas processed out by tail gas, through heater exhaust gas 51, after the high-temperature flue gas heat exchange of discharging with tail gas burning furnace 3, mixed hydrogen, enter hydrogenator 52.Under the effect of hydrogenation catalyst, SO
2and COS etc. is by hydrogenation hydrolyzation, be reduced to H
2s.The H that the hydrogen entering hydrogenator 52 provides according to the online hydrogen analyzer after hydrogenator 52
2concentration signal regulates.To produce after low-pressure saturated steam reclaims heat through vapour generator 53 from hydrogenator 52 reaction gas out and enter tail gas quenching tower 54, directly contact cooling with quenched water.Quenched water at the bottom of tower is again squeezed into tower internal recycle and is used after the boosting of chilling water pump, metre filter, the cooling of quenched water water cooler.Because exhaust temperature reduces, condensation is got off, unnecessary quenched water delivers to the process of converter unit phlegma stripping tower after entering sour water tank, the low temperature cold lime set steam that converter unit produces is carried out stripping, by NH wherein
3and CO
2etc. the process of component stripping, produce comparatively pure phlegma.Tail gas after chilling cooling out enters tail gas absorber 6 from tower top, and MDEA (N methyldiethanol amine the refers to poor amine liquid herein) solution sent here with amine liquid regeneration section lean pump absorbs H wherein
2s, thus further reduce H in waste gas
2the content of S.Amine liquid regeneration section to absorb H
2s, CO
2mDEA (abbreviation rich amine solution) regenerate, discharge the H be dissolved in wherein
2s and CO
2, become poor amine liquid, enter tail gas absorber recycling.
The purified gas that tail gas absorber 6 ejects enters tail gas burning furnace 3 and burns, in tail gas burning furnace 3, and H remaining in purified gas
2s is combusted as SO
2, decomposition of hydrocarbons becomes CO
2and H
2o, high-temperature flue gas after vapor superheater (not shown) and heater exhaust gas 51 recovery waste heat, by smoke stack emission cleaning of off-gas.SO in cleaning of off-gas
2content is low, discharges used heat less simultaneously, thus decreases environmental pollution.
In the present embodiment, molten sulfur pond 1 also comprises: gas ammonia source line 11, molten sulfur lift pump 12 and evacuation 13.Gas ammonia source line 11 passes into inside, molten sulfur pond 1 via the roof in molten sulfur pond 1; It is inner that molten sulfur lift pump 12 is arranged on molten sulfur pond 1; Evacuation 13 is provided with sulfur-bearing and promotes liquid entrance and sulphur-containing exhaust gas outlet, and sulfur-bearing is promoted liquid entrance and is connected with molten sulfur lift pump 12 by sulphur-bearing waste solution lift line.
In the present embodiment, evacuation 13 is also provided with steam-in, for passing into steam in described evacuation 13.
The Molten sulphur that sulfur recovery unit sulphur part producing goes out is from flowing to molten sulfur pond 1, due to H
2s gas can form polysulfide after being dissolved in Molten sulphur, this kind of more difficult separation of polysulfide.In order to more effectively remove this kind of polysulfide, inject ammonia by gas ammonia source line 11 in molten sulfur pond 1, under the effect of ammonia, polysulfide is converted into H
2s, is easy to be separated from Molten sulphur.Molten sulphur carries out spraying flash distillation through molten sulfur lift pump 12 circulation, and (spray flash distillation and refer to that after molten sulfur degasification pump promotes from the side in molten sulfur pond, deliver to opposite side sprays, be equivalent to throttling expansion, the H2S be dissolved in molten sulfur just discharges.), improve H in Molten sulphur
2the removal efficiency of S waste gas.Evacuation 13 passes into steam to steam-in, forms negative pressure in sulphur-containing exhaust gas exit, sulphur-containing exhaust gas is drawn out of and delivers to burner for producing sulfur burning..
In another kind of exemplary embodiment of the present invention, provide a kind of molten sulfur degasification method, the method utilizes any one degas system above-mentioned to remove the sulphur-containing exhaust gas in above-mentioned molten sulfur, is purified tail gas.The waste gas removed compared to Molten sulphur is without any process recovery measure, only directly enter in air after high temperature incineration, and similar molten sulfur degasification method, molten sulfur degasification method provided by the invention reduces sulfur recovery unit discharge sulfur dioxide in flue gas content, effectively reduces environmental pollution.In a kind of preferred embodiment of the present invention, the SO in the cleaning of off-gas that above-mentioned molten sulfur degasification method obtains
2content be less than or equal to 884mg/Nm
3.The waste gas removed compared to Molten sulphur, without any process recovery measure, only directly enters in air after high temperature incineration, comes from the SO in waste gas in present method discharge flue gas
2have dropped 96%, decrease environmental pollution.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. a molten sulfur degasification system, is characterized in that, described degas system comprises:
Molten sulfur pond (1), has sulphur-containing exhaust gas outlet, in order to discharge the sulphur-containing exhaust gas in described molten sulfur pond (1);
Reaction of Salmon-Saxl unit (2) processed, is connected with described molten sulfur pond (1), and described reaction of Salmon-Saxl unit (2) processed has sulphur-containing exhaust gas entrance and desulfidation tail gas outlet, in order to described sulphur-containing exhaust gas is made sulphur simple substance;
Tail gas burning furnace (3), has desulfidation tail gas entrance and cleaning of off-gas relief outlet, and described desulfidation tail gas entrance exports with described desulfidation tail gas and is connected; And
Compressor (4), be arranged between described molten sulfur pond (1) and described reaction of Salmon-Saxl unit (2) processed, be connected with described molten sulfur pond (1) by described sulphur-containing exhaust gas outlet, and be connected with described reaction of Salmon-Saxl unit (2) processed by described sulphur-containing exhaust gas entrance.
2. degas system according to claim 1, is characterized in that, described reaction of Salmon-Saxl unit (2) processed comprising:
Burner for producing sulfur (21);
Sulphur waste heat boiler (22) processed, described burner for producing sulfur (21) and described sulphur waste heat boiler (22) processed are arranged in same housing;
Three grades of condensers (24), described three grades of condensers (24) comprise first step condenser, second stage condenser and third stage condenser;
Secondary reformer (25), described secondary reformer (25) comprises first step convertor and second stage convertor; And
Process heat exchangers (26), described process heat exchangers (26) comprises process heat exchangers tube side and process heat exchangers shell side;
Wherein, described sulphur waste heat boiler (22) processed is connected with described third stage condenser via described first step condenser, first step convertor, process heat exchangers tube side, second stage condenser, process heat exchangers shell side, second stage convertor successively; Described third stage condenser is connected with described tail gas burning furnace (3) by the first waste heat recovery pipeline.
3. degas system according to claim 2, it is characterized in that, described burner for producing sulfur (21) is provided with pyroprocess gas vent pipe, described pyroprocess gas vent pipe is provided with high temperature blending valve (27), and on the pipeline of described high temperature blending valve (27) between described first step condenser and described first step convertor.
4. degas system according to claim 2, it is characterized in that, described reaction of Salmon-Saxl unit (2) processed also comprises: sulphur sealed cans and tail gas divide flow container (28), described sulphur sealed cans are connected with described first step condenser respectively by the first condensate drain line, be connected with described second stage condenser by the second condensate drain line, and are connected with described third stage condenser by the 3rd condensate drain line.
5. degas system according to claim 4, is characterized in that, described tail gas divides flow container (28) to be connected with described third stage condenser by sulphur exhaust emission tube line processed.
6. degas system according to claim 1, is characterized in that, described degas system also comprises:
Tail gas hydrogenation reaction member (5), comprises the heater exhaust gas (51), hydrogenator (52), vapour generator (53) and the tail gas quenching tower (54) that are connected successively; Described tail gas quenching tower (54) top is provided with chilling tail gas relief outlet; And
Tail gas absorber (6), is connected with described tail gas quenching tower (54) by described chilling tail gas relief outlet;
Wherein, described tail gas hydrogenation reaction member (5) is connected with described reaction of Salmon-Saxl unit (2) processed by described desulfidation tail gas outlet, and described tail gas absorber (6) is connected with described tail gas burning furnace (3) by described desulfidation tail gas entrance; Described heater exhaust gas (51) is connected with described tail gas burning furnace (3) by the second waste heat recovery pipeline.
7. degas system according to claim 6, is characterized in that, is provided with online hydrogen analyzer between described hydrogenator (52) and described vapour generator (53).
8. the degas system according to claim 6 or 7, is characterized in that, described tail gas quenching tower (54) top is provided with quenched water entrance, and bottom is provided with quenched water outlet; Described quenched water entrance is exported with described quenched water and is connected by quenched water circulation line.
9. degas system according to claim 8, is characterized in that, according to the loop direction of quenched water on quenched water circulation line, is disposed with chilling water pump, strainer and quenched water water cooler.
10. degas system according to claim 1, is characterized in that, described molten sulfur pond (1) also comprises:
Gas ammonia source line (11), it is inner that the roof via described molten sulfur pond (1) passes into described molten sulfur pond (1);
Molten sulfur lift pump (12), is arranged on described molten sulfur pond (1) inner; And
Evacuation (13), be provided with sulfur-bearing and promote liquid entrance and the outlet of described sulphur-containing exhaust gas, described sulfur-bearing is promoted liquid entrance and is connected with described molten sulfur lift pump (12) by sulphur-bearing waste solution lift line.
11. degas systems according to claim 10, is characterized in that, (13) are also provided with steam-in to described evacuation, for passing into steam in described evacuation (13).
12. 1 kinds of molten sulfur degasification methods, is characterized in that, utilize the molten sulfur degasification system according to any one of claim 1 to 11 to remove the sulphur-containing exhaust gas in molten sulfur, are purified tail gas.
13. degas methods according to claim 12, is characterized in that, the SO in described cleaning of off-gas
2content be less than or equal to 884mg/Nm
3.
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