CN104249996A - Technology for reducing SO2 emission concentration of sulfur recovery apparatus - Google Patents
Technology for reducing SO2 emission concentration of sulfur recovery apparatus Download PDFInfo
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- CN104249996A CN104249996A CN201310256677.7A CN201310256677A CN104249996A CN 104249996 A CN104249996 A CN 104249996A CN 201310256677 A CN201310256677 A CN 201310256677A CN 104249996 A CN104249996 A CN 104249996A
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Abstract
The invention relates to a technology for reducing SO2 emission concentration of a sulfur recovery apparatus. The technology comprises a tail gas purification processing stage, concretely in the tail gas purification processing stage, Clause tail gas is successively subjected to hydrogenation reaction, cooling by a quench tower and liquid-ammonia absorption, a part of purified tail gas is used as a gas-stripping gas for degassing liquid sulfur, and the residual purified tail gas is introduced into an incinerator to be burned, the liquid-sulfur degassing waste gas enters a catalytic reaction stage and is subjected to catalytic processing, the amine liquid absorbing hydrogen sulfide enters a regeneration tower for regeneration, a regenerated acidic gas and a raw material acidic gas are mixed and again return to a thermal reaction stage for further recovering of element sulfur. The provided method for reducing SO2 emission concentration of the sulfur recovery apparatus is efficient, energy-saving and economic, and the SO2 emission concentration is substantially reduced.
Description
Technical field
The invention belongs to technical field of sulfur recovery, specifically, relate to a kind of reduction sulfur recovery facility SO
2the technique of emission concentration.
Background technology
Along with the development of society, problem of environmental pollution has become the restraining factors of rapid economic development, is that national governments make laws requisite important content.Industrially developed country requires very strict to sulphur emissions, United States Federal Government Bureau for Environmental Protection rules and regulations petroleum refining industry flue gas of heating furnace, tail gas of sulphur and regeneration fume from catalytic cracking SO
2emission concentration limit value is 50ppm (v), about amounts to 143mg/m
3.External in research Claus method sulfur recovery tail gas process new technology.The U.S. has delivered the technique patent (US7311891B2) reclaiming sulphur by absorption method from Claus tail gas for 2007, will containing SO
2tail gas by adsorption bed, SO
2by adsorbent, then use inert gas purge desorption SO
2, containing SO
2desorption gas be recycled to Claus device and transform further.
At present, Chinese sulfur recovery facility flue gas SO
2emission concentration performs GB16297-1996 " discharge standard of air pollutants ", standard regulation SO
2emission concentration is less than 960mg/m
3.Within 2014, be about to the new environmental protection standard performed, regulation sulfur recovery facility flue gas SO
2emission concentration is less than 400mg/m
3, area discharge is less than 200mg/m especially
3.SO in the most of sulfur recovery facility flue gas of current China
2though content is at 960mg/m
3below, but be difficult to reach 200mg/m
3standard-required.Affect sulfur recovery facility flue gas SO
2the factor of emission concentration is mainly untreated complete sulfocompound in Claus cleaning of off-gas and the degassed waste gas of liquid stream.
The transformation efficiency (particularly organic sulfur content) of the total sulfur content of cleaning of off-gas and the degree of purification of sweetening agent and catalyzer is closely related, and cleaning of off-gas is mainly containing unabsorbed H
2s and organosulfur, be converted into SO after incinerator burns
2, increase smoke SO 2 emission concentration 150-500mg/m3.Use efficient desulfurizing agent significantly will reduce the total sulfur content of cleaning of off-gas, as the MS-300 Compositional type efficient desulfurizing agent of Huntsman Corporation of U.S. exploitation, the H of cleaning of off-gas can be made
2s content is down to 10mg/m
3below, to flue gas SO
2emission concentration contribution margin is 10-20mg/m
3.
The ultimate principle of molten sulfur degasification is the H that release is dissolved
2s gas, and allow polysulfide by H
2s
xh
2s+S
xfast decoupled, finally removes remaining H from molten sulfur
2s, the total H in degassed rear molten sulfur
2s content reaches 0.001wt%.The stripping gas of molten sulfur degasification is generally air, steam, Claus tail gas and nitrogen, and steam easily causes pipeline and equipment corrosion; H contained by Claus tail gas
2s can make molten sulfur dissociate H
2s convergence balances, and molten sulfur cannot meet H
2s is less than the index request of 10ppm; The usual oxygen level of nitrogen is lower, is unfavorable for the oxidation of sulfocompound.Therefore, usually use air as the degassed sweep gas of liquid stream.
JACOBS adopts the proprietary molten sulfur degasification technology of Shell company, in molten sulfur pond, arrange stripping tower, air by stripping tower, molten sulfur under the strong stirring of airflow, the hydrogen polysulfide (H of dissolving
2s
x) resolve into H
2s, H
2s enters gas-phase space with air.Separate H
2the gas of S is pumped to tail gas burning furnace through steam injector.KTI adopts the proprietary molten sulfur degasification technology of BP company Amoco, and stripping tower is a catalytic filler tower, and tower is placed in above molten sulfur pond, and in molten sulfur pond, molten sulfur enters stripping tower from bottom after pump boosting together with air.After molten sulfur and air pass through packing layer, the hydrogen polysulfide (H of dissolving
2s
x) resolve into H
2s, H
2s enters gas-phase space with air, and gas mixture delivers to incinerator.The SINI liquid sulphur degasification technique of NIGI company exploitation, have employed sieve-tray tower, tower is placed in above molten sulfur pond, and in molten sulfur pond, molten sulfur enters gas stripping column from bottom after pump boosting together with air.Molten sulfur and air reach close contact by sieve aperture, the hydrogen polysulfide (H of dissolving
2s
x) resolve into H
2s, H
2s enters gas-phase space with air, and gas mixture delivers to incinerator or Reaktionsofen.
Existing sulfur recovery technology technology can meet GB16297-1996 " discharge standard of air pollutants ", but cannot meet the new environmental protection standard requirement being about to for 2014 perform.The stripping gas of existing molten sulfur degasification technology molten sulfur degasification is generally air, steam, Claus tail gas and nitrogen, and steam easily causes pipeline and equipment corrosion, and outer air supply source can increase the tolerance of Process Gas, thus increases pipeline and equipment size; H contained by Claus tail gas
2s can make molten sulfur dissociate H
2s convergence balances, and molten sulfur cannot meet H
2s is less than the index request of 10ppm.The process employing incinerator incineration technology that existing liquid stream is degassed, waste gas contains H
2the S-contained substances such as S and sulphur steam directly introduce incinerator process, and S-contained substance burning conversion is SO
2, make flue gas SO
2emission concentration increases 150-200mg/m
3, the emission standard being about to implement cannot be met.
Summary of the invention
For solving the problems of the technologies described above, the present invention proposes the low technique of a kind of less investment, process cost to reduce sulfur recovery facility flue gas SO
2emission concentration, solves SO in existing sulphur recovery
2discharge technical problem not up to standard.
Technical scheme of the present invention is: a kind of reduction sulfur recovery facility SO
2the technique of emission concentration, its step comprises:
1) the thermal response stage:
Containing H
2sour gas partial combustion in Reaktionsofen of S is converted into SO
2, at high temperature H
2s and SO
2claus occurs and reacts generting element sulphur and Reaktionsofen tail gas, elementary sulfur enters the recovery of molten sulfur pond and obtains Molten sulphur, and Reaktionsofen tail gas enters catalytic reaction stages; Described Reaktionsofen temperature of combustion is 900-1400 DEG C.
2) catalytic reaction stages: comprise two-stage catalyzed reaction
Reaktionsofen tail gas enters the one-level convertor of catalytic reaction stages, react under catalyst action, generting element sulphur and one-level convertor tail gas, elementary sulfur enters the recovery of molten sulfur pond and obtains Molten sulphur, one-level convertor tail gas enters secondary reformer reaction, under catalyst action after Claus catalyzed conversion, elementary sulfur enters the recovery of molten sulfur pond and obtains Molten sulphur, the treatment stage that the Claus tail gas after catalyzed reaction entering tail gas clean-up.
3) treatment stage of tail gas clean-up:
First Claus tail gas heating enters hydrogenator after 200-300 DEG C, and under hydrogenation catalyst effect, sulfocompound hydrocracking is H
2s, is then cooled to 25-42 DEG C through quench tower, enters amine absorption tower, the H in amine absorption hydrogenation tail gas
2enter regenerator column after S to regenerate; A part for cleaning of off-gas is introduced the gas stripping gas of molten sulfur pond as molten sulfur degasification, the remainder of cleaning of off-gas is introduced after incinerator burns and is discharged; The molten sulfur degasification waste gas in molten sulfur pond is divided into two portions, and a part and Reaktionsofen tail gas are mixed into one-level convertor and process, and another part and one-level convertor tail gas are mixed into secondary reformer and process; The amine liquid of absorbing hydrogen sulphide enters regenerator column and regenerates, regenerated acidic gas and step 1) in raw material sour gas mix, returning to the thermal response stage reclaims elementary sulfur further.
Described molten sulfur degasification waste gas is divided into two portions, and a part enters one-level convertor and carries out two-stage catalytic treatment, and another part enters secondary reformer and carries out catalyzed reaction process, and two-part volume ratio can be arbitrary proportion, preferred 1:1.
Described amine absorption tower is built with compound highly effective sweetening agent.
The described thermal response stage is mixed firing in Reaktionsofen by sour gas and air, control combustion temperature 900-1400 DEG C, the H of about 1/3rd
2s burning conversion is SO
2, and at high temperature there is Claus reaction.
2H
2S+3O
2→2SO
2+2H
2O (1)
SO
2＋2H
2S→2H
2O＋3S (2)
Formed containing elementary sulfur, H
2s, SO
2, COS, CS
2reaktionsofen tail gas.Elementary sulfur wherein enters molten sulfur pond through condensation, and Reaktionsofen tail gas enters catalytic reaction stages.
Described catalytic reaction stages, refers to that Reaktionsofen tail gas enters the one-level convertor and the secondary reformer that load Claus conversion catalyst according to grading distribution scheme, under the effect of catalyzer, occurs to react as follows:
SO
2＋2H
2S→2H
2O＋3S (2)
COS+H
2O→H
2S+CO
2 (3)
CS
2+2H
2O→2H
2S+CO
2 (4)
May there is a small amount of leakage oxygen in the degassed waste gas in molten sulfur pond, oxygen can cause the generation of sulphating phenomenon to alumina base sulfur recovery catalyst, infringement catalyst performance.Therefore, the filling of catalyzer should be carried out according to certain grading distribution scheme.
The filling grading distribution scheme of catalyzer: the multi-functional sulfur recovery catalyst with omitted oxygen function of 1/1 to two/3rd height is all loaded on one-level convertor and secondary reformer top, the bigger serface alumina base sulfur recovery catalyst of 1/2 to two/3rd height is all loaded in bottom.
The multi-functional sulfur recovery catalyst of LS-981 of research institute of asphalt in Shenli Refinery of described multi-functional sulfur recovery catalyst preferred China Petrochemical Industry exploitation, external without like product.LS-981 is a kind of multifunctional sulfur recovery catalyst, and the titanium aluminium complex carrier adopting coprecipitation method to prepare, improves the resistance to sulphating ability of catalyzer; By adding other metal oxide, improve catalyzer tempreture organic sulphur hydrolysis activity, coking resistivity and the " O that is left out
2" active.Because LS-981 adopts titanium aluminium complex carrier, overcome the resistance to vitriol ability of common aluminium oxide catalyst, iron content aluminium oxide catalyst tempreture organic sulphur hydrolysis ability, Ti-base catalyst manufacturing cost is high, wear away large shortcoming, is applicable to Process Gas containing the sulfur recovery facility leaking oxygen.
The alumina base sulfur recovery catalyst specific surface area of described bigger serface should higher than 350m
2/ g, the LS-02 catalyzer of research institute of asphalt in Shenli Refinery of preferred China Petrochemical Industry development.LS-02 catalyzer is the novel oxidized aluminium base catalyst for sulphur that a kind of specific surface area is larger, pore volume is higher developed on LS-300 basis, this catalyzer Claus activity is high, resistant to thermal aging and hydrothermal aging ability strong, and uniform particles, abrasion are little, crushing strength is high, thus ensure that the long-term operation of catalyzer; More reasonably pore structure, macropore is more, and pore structure be bimodal distribution, and the sulphur that reaction is generated speeds away catalyzer duct, improves Claus activity and the tempreture organic sulphur hydrolysis activity of catalyzer further.
Above-mentioned catalyzer all can be purchased from the market, and its physico-chemical property and technical indicator are in table 1.
Table 1 catalyzer physico-chemical property and technical indicator
After Claus catalyzed conversion, elementary sulfur enters molten sulfur pond through condensation, and reacted Claus tail gas contains micro-sulphur, H
2s, SO
2with COS, CS
2sulfides, the treatment stage of entering tail gas clean-up.
Refer to the treatment stage of described tail gas clean-up that Claus tail gas is heated to 200-300 DEG C and enters hydrogenator, under the effect of hydrogenation catalyst, the elementary sulfur carried in Claus tail gas, SO
2all H is converted into Deng hydrogenation
2s, COS, CS
2hydrolysis is H
2s.Containing H
2the hydrogenation tail gas of S is cooled to 25-42 DEG C through quench tower, enters the amine absorption tower that compound highly effective desulfurization solvent is housed, H
2s, by amine absorption, absorbs H
2h in cleaning of off-gas after S
2s content is less than 10ppm (v); Introduced Partial cleansing tail gas bottom molten sulfur pond, it is degassed that the gas stripping gas as molten sulfur degasification carries out bubbling to molten sulfur, deviates to be dissolved in the micro-H in molten sulfur
2s, makes the H dissolved in molten sulfur
2the amount of S is less than 10ppm.All the other cleaning of off-gas are introduced incinerator and are burned.Containing H
2the waste gas of the molten sulfur degasification of S and sulphur steam is extracted out through gas swab, waste gas is divided into two portions, one-level convertor is entered respectively and secondary reformer carries out sulfur recovery process after mixing with Reaktionsofen tail gas and one-level convertor tail gas respectively, the catalyzer of one-level convertor and secondary reformer filling loads according to specific grading distribution scheme, to avoid the oxygen in waste gas to cause damage to catalyst performance.
Described introducing molten sulfur pond is as the cleaning of off-gas of the gas stripping gas of molten sulfur degasification, and its introduction volume is 300 ~ 1000Nm
3/ h.
The compound highly effective sweetening agent using degree of purification higher in described amine absorption tower, it is at absorption temperature 25-42 DEG C, hydrogenation tail gas H
2s content 0-5(v/v) %, under the operating mode of gas-liquid volume ratio 0-500, ensure de-after purification tail gas H
2s content is less than 50ppm (v), is preferably less than 10ppm (v).
The molten sulfur degasification mode in described molten sulfur pond adopts bubbling degassed, and bubbling is gases used is sulfur recovery facility absorption tower top cleaning of off-gas, considers contained H in gas stripping gas
2free H in S and molten sulfur
2s equilibrium problem, H in gas stripping gas
2s content should be less than 50ppm (v), is preferably less than 10ppm (v).Molten sulfur degasification waste gas adopts environmental protection, energy-conservation treatment process, is divided into two portions, and a part and Reaktionsofen tail gas are mixed into one-level convertor and process, and another part and one-level convertor tail gas are mixed into secondary reformer and process; H in waste gas
2s is converted into sulphur through Claus reaction and reclaims, H
2the cleaning of off-gas that S content is less than 10ppm (v) is converted into SO through incinerator burning
2rear discharge, can reduce sulfur recovery facility flue gas SO
2emission concentration, meets sulfur recovery facility SO
2emission concentration is less than 100mg/m
3requirement.The catalyzer of one-level convertor and secondary reformer filling loads according to specific grading distribution scheme, to avoid the oxygen in waste gas to cause damage to catalyst performance.Solve the realistic problem that the discharge of existing sulfur recovery facility does not meet New emission standard, for newly-built sulfur recovery facility provides the novel method that a kind of less investment, process cost are low.The method adopts device to have gas by oneself, has saved the consumption of the foreign gas such as air, nitrogen, steam, has reduced sulfur recovery facility Process Gas tolerance, avoids pipeline and equipment size increase.
The catalyzer that the one-level convertor of the degassed waste gas in process molten sulfur pond and secondary reformer use loads according to specific grading distribution scheme, the multi-functional sulfur recovery catalyst with omitted oxygen function of one-level convertor and secondary reformer top filling 1/1 to two/3rd height, the bigger serface alumina base sulfur recovery catalyst of bottom filling 1/2 to two/3rd height.
Beneficial effect of the present invention is: the reduction sulfur recovery facility SO 1, providing a kind of economy
2the method of emission concentration, SO
2emission concentration can be down to 100mg/m
3below; 2, provide the treatment process of a kind of environmental protection, energy-conservation molten sulfur degasification waste gas, molten sulfur degasification gas stripping gas of the present invention does not need outer air feed, and sulphur-containing exhaust gas is introduced sulphur unit processed and reclaims elementary sulfur, the sulphur in molten sulfur degasification waste gas and sulfocompound are recycled; 3, provide a kind of method of molten sulfur degasification, adopt cleaning of off-gas bubble techniques, saved the consumption of nitrogen, steam, reduced sulfur recovery facility Process Gas tolerance, reduce pipeline and equipment size; 4, a kind of high-efficient purification technology of Claus tail gas is provided, can by cleaning of off-gas H
2s is removed to 10ppm (v) below.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention;
Fig. 2 is the process flow sheet of embodiment 8 in the present invention;
Fig. 3 is the process flow sheet of embodiment 9 in the present invention.
Wherein, 1, sour gas; 2, Reaktionsofen; 3, one-level convertor; 4, secondary reformer; 5, Claus tail gas; 6, hydrogenator; 7, quench tower; 8, amine absorption tower; 9, cleaning of off-gas; 10, molten sulfur degasification waste gas; 11, molten sulfur pond; 12, incinerator; 13, regenerator column; 14, regenerated acidic gas; 15, lean solution; 16, air or nitrogen; 17, preheater; 18, power steam; 19, steam injector; 20, Reaktionsofen tail gas; 21, one-level convertor tail gas.
Embodiment
The present invention is illustrated below in conjunction with drawings and Examples.
Embodiment 1:
Technical process as shown in Figure 1, comprise the thermal response stage, catalytic reaction stages and tail gas clean-up treatment stage.
1) the thermal response stage:
Containing H
2s:90(v/v) partial combustion in Reaktionsofen (2) of the sour gas (1) of % is converted into SO
2, H at Reaktionsofen temperature of combustion 1250 DEG C
2s and SO
2claus occurs and reacts generting element sulphur and Reaktionsofen tail gas (20), enter molten sulfur pond (11) recovery after elemental sulphur condenses and obtain Molten sulphur, Reaktionsofen tail gas (20) enters catalytic reaction stages.Reaktionsofen tail gas (20) sulfocompound volume content is: H
2s:8.1%, SO
2: 4.0%, organosulfur: 0.4%.
2) catalytic reaction stages:
Reaktionsofen tail gas (20) enters one-level convertor (the 3) (reaction conditions: temperature 300 DEG C, air speed 800h of catalytic reaction stages
-1), react under catalyst action, generting element sulphur and one-level convertor tail gas (21), elementary sulfur enters molten sulfur pond (11) recovery and obtains Molten sulphur, one-level convertor tail gas (21) enters secondary reformer (4) reaction (reaction conditions: temperature 250 DEG C, air speed 800h
-1), under catalyst action after Claus catalyzed conversion, elementary sulfur enters molten sulfur pond (11) recovery and obtains Molten sulphur, the treatment stage that the Claus tail gas (5) after catalyzed reaction entering tail gas clean-up.Catalyst loading scheme is the LS-02 bigger serface alumina base sulfur recovery catalyst of the multi-functional sulfur recovery catalyst of LS-981 with omitted oxygen function of one-level convertor and secondary reformer top filling 1/3rd height, bottom filling 2/3rds height.Claus tail gas (5) sulfocompound volume content is: H
2s:1.4%, SO
2: 0.6%, organosulfur: 0.1%.
3) treatment stage of tail gas clean-up:
Claus tail gas (5) first enters hydrogenator, and under hydrogenation catalyst effect, sulfocompound hydrocracking is H
2s, is then cooled to 40 DEG C through quench tower (7), enters amine absorption tower (8), the H in amine absorption hydrogenation tail gas
2s, makes H in cleaning of off-gas (9)
2s content is down to 9ppm (v), and the amine liquid (rich amine solution) of absorbing hydrogen sulphide enters regenerator column (13) and regenerates; By 500Nm
3/ h cleaning of off-gas (9) introduces the gas stripping gas of molten sulfur pond (11) as molten sulfur degasification, and all the other cleaning of off-gas (9) are introduced after incinerator (12) burns and discharged; The molten sulfur degasification waste gas (10) in molten sulfur pond (11) is divided into two portions, a part and Reaktionsofen tail gas (20) are mixed into one-level convertor (3) and process, and another part and one-level convertor tail gas (21) are mixed into secondary reformer (4) and process; The amine liquid of absorbing hydrogen sulphide enters regenerator column (13) and regenerates, regenerated acidic gas (14) H
2s content 54%, with step 1) in sour gas (1) mix, returning to the thermal response stage reclaims elementary sulfur further.
In embodiment 1, molten sulfur degasification gas stripping gas does not need outer air feed, and the sulphur in molten sulfur degasification waste gas (10) and sulfocompound are recycled, final sulphur unit flue gas SO
2emission concentration can be down to 100mg/m
3below.
In embodiment 1 treatment stage of tail gas clean-up in amine absorption tower (8) desulfurizer therefor be Huntsman Corporation of the U.S. MS-300 sweetening agent that degree of purification is higher.Cleaning of off-gas (9) hydrogen sulfide content is less than 10ppm (v); Sulfur recovery unit molten sulfur degasification mode adopts bubbling degassed, and bubbling is gases used is less than 10ppm (v) cleaning of off-gas (9) for top, sulphur unit absorption tower hydrogen sulfide content.
Embodiment 2:
Divided by outside lower difference, other are with embodiment 1.
1) the thermal response stage:
Containing H
2s:82(v/v) partial combustion in Reaktionsofen (2) of the sour gas (1) of % is converted into SO
2.
Reaktionsofen tail gas (20) sulfocompound volume content is: H
2s:6.2%, SO
2: 3.3%, organosulfur: 0.3%.
2) catalytic reaction stages:
One-level convertor (3) (reaction conditions: temperature 310 DEG C, air speed 800h
-1), secondary reformer (4) (reaction conditions: temperature 240 DEG C, air speed 800h
-1).Catalyst loading scheme is the LS-02 bigger serface alumina base sulfur recovery catalyst of the multi-functional sulfur recovery catalyst of LS-981 with omitted oxygen function of one-level convertor and secondary reformer top filling 1/2nd height, bottom filling 1/2nd height.Claus tail gas (5) sulfocompound volume content is: H
2s:1.3%, SO
2: 0.5%, organosulfur: 0.08%.
3) treatment stage of tail gas clean-up:
The amine liquid of absorbing hydrogen sulphide enters regenerator column (13) and regenerates, regenerated acidic gas (14) H
2s content 48%, with step 1) in sour gas (1) mix, returning to the thermal response stage reclaims elementary sulfur further.
Embodiment 3:
Divided by outside lower difference, other are with embodiment 1.
1) the thermal response stage:
Containing H
2s:52(v/v) partial combustion in Reaktionsofen (2) of the sour gas (1) of % is converted into SO
2.
Reaktionsofen tail gas (20) sulfocompound volume content is: H
2s:5.1%, SO
2: 2.4%, organosulfur: 0.3%.
2) catalytic reaction stages:
One-level convertor (3) (reaction conditions: temperature 310 DEG C, air speed 800h
-1), secondary reformer (4) (reaction conditions: temperature 240 DEG C, air speed 800h
-1).
Claus tail gas (5) sulfocompound volume content is: H
2s:1.2%, SO
2: 0.4%, organosulfur: 0.06%.
2) treatment stage of tail gas clean-up:
H in amine absorption hydrogenation tail gas
2s, makes H in cleaning of off-gas (9)
2s content is down to 7ppm (v).
The amine liquid of absorbing hydrogen sulphide enters regenerator column (13) and regenerates, regenerated acidic gas (14) H
2s content 38%, with step 1) in sour gas (1) mix, returning to the thermal response stage reclaims elementary sulfur further.
Embodiment 4:
The MS-300 efficient desulfurizing agent adopting Huntsman Corporation of the U.S. to produce processes H
2the unstripped gas of S content volume fraction as shown in table 2.Test conditions is: absorption temperature 40 DEG C, gas-liquid volume ratio 300:1, the H of unstripped gas after purification
2s content is as shown in table 2.
Embodiment 5:
According to the test conditions of embodiment 4, adopt domestic common desulphurization agent to process H
2the unstripped gas of S content volume fraction as shown in table 2.The H of unstripped gas after purification
2s content is as shown in table 2.
Table 2 sweetening agent is to H
2the decontamination effect improving of S
| Unstripped gas Central Plains H 2S volume fraction, % | 4 | 3 | 2 | 1 |
| H after the purification of MS-300 efficient desulfurizing agent 2S volume fraction/ppm | 13 | 9 | 7 | 6 |
| H after domestic common desulphurization agent purification 2S volume fraction/ppm | 492 | 406 | 296 | 183 |
As can be seen from table 2 result, the selection of sweetening agent is to H remaining in cleaning of off-gas
2s impact is very large.
Embodiment 6:
Divided by outside lower difference, other are with embodiment 1.
Molten sulfur degasification mode adopts bubbling degassed, and bubbling gas stripping gas used is H
2s content is the cleaning of off-gas (9) of 9ppm (v).Sulfur recovery facility flue gas SO
2emission concentration is as shown in table 3.
Embodiment 7:
Divided by outside lower difference, other are with embodiment 2.
Molten sulfur degasification mode adopts bubbling degassed, and bubbling gas stripping gas used is H
2s content is the cleaning of off-gas (9) of 9ppm (v).Sulfur recovery facility flue gas SO
2emission concentration is as shown in table 3.
Embodiment 8:
Technical process as shown in Figure 2, comprise the thermal response stage, catalytic reaction stages and tail gas clean-up treatment stage.Divided by outside lower difference, other are with embodiment 1 or embodiment 2.
3) treatment stage of tail gas clean-up:
The molten sulfur degasification waste gas of cleaning of off-gas (9) with molten sulfur pond (11) is mixed, introduces after incinerator (12) burns and discharge.
Molten sulfur degasification mode adopts bubbling degassed, and bubbling is gases used is outer for air or nitrogen (16), sulfur recovery facility flue gas SO
2emission concentration is as shown in table 3.
Embodiment 9:
Technical process as shown in Figure 3, comprise the thermal response stage, catalytic reaction stages and tail gas clean-up treatment stage.Divided by outside lower difference, other are with embodiment 1 or embodiment 2.
1) the thermal response stage:
Containing H
2the sour gas (1) of S enters partial combustion in Reaktionsofen (2) and is converted into SO after preheater (17) preheating
2.
3) treatment stage of tail gas clean-up:
Claus tail gas (5) first enters hydrogenator, and under hydrogenation catalyst effect, sulfocompound hydrocracking is H
2s, is then cooled to 40 DEG C through quench tower (7), enters amine absorption tower (8), the H in amine absorption hydrogenation tail gas
2s, makes H in cleaning of off-gas (9)
2s content is down to 9ppm (v), and the amine liquid (rich amine solution) of absorbing hydrogen sulphide enters regenerator column (13) and regenerates; Cleaning of off-gas (9) is introduced after incinerator (12) burns and is discharged; The molten sulfur degasification waste gas (10) in molten sulfur pond (11) is after steam injector (19) pressurization, molten sulfur degasification waste gas (10) mixes with sour gas (1), Reaktionsofen (2) process is introduced after preheating, react through secondary Claus+SCOT, after hydrogenation, tail gas is by chilling, amine absorption cleaning, discharged in burning; The amine liquid of absorbing hydrogen sulphide enters regenerator column (13) and regenerates, regenerated acidic gas (14) and step 1) in sour gas (1) mix, returning to the thermal response stage reclaims elementary sulfur further.
Molten sulfur degasification mode adopts bubbling degassed, and bubbling is gases used is outer for air or nitrogen (16).Steam injector (19) needs to introduce steam.Sulfur recovery facility flue gas SO
2emission concentration is as shown in table 3.
Table 3 sulfur recovery facility flue gas SO
2emission concentration
As can be seen from Table 3, molten sulfur degasification off gas treatment mode is different, to flue gas SO
2the impact of emission concentration differs greatly, and in embodiment 8, molten sulfur degasification waste gas is directly introduced after incinerator burns and discharged, and can cause flue gas SO
2emission concentration significantly increases; In embodiment 9, molten sulfur degasification waste gas introduces Reaktionsofen process, although can significantly reduce flue gas SO after steam injector pressurization
2emission concentration, but this technique exists following shortcoming is: and the introducing of (1) steam can cause Reaktionsofen fire box temperature to reduce, and in order to ensure that the temperature of reaction of Reaktionsofen maintains more than 1150 DEG C, needs to carry out preheating to sour gas, increases energy waste; (2) introduce steam, the amount of Process Gas can be increased, thus increase pipeline and equipment size, increase investment and energy consumption.
Embodiment 10:
Divided by outside lower difference, other are with embodiment 1.
The treatment stage of sulfur recovery facility tail gas clean-up, desulfurizer therefor is the compound highly effective sweetening agent that degree of purification is higher, cleaning of off-gas H
2s content is 9ppm (v); Sulfur recovery facility molten sulfur degasification mode adopts bubbling degassed, and bubbling is gases used is H
2s is the cleaning of off-gas of 9ppm (v), and after sulphur secondary processed, the rate of recovery is as shown in table 4.
Embodiment 11:
Divided by outside lower difference, other are with embodiment 2.
After sulphur secondary processed, the rate of recovery is as shown in table 4.
Embodiment 12:
Divided by outside lower difference, other are with embodiment 10.
One-level convertor and secondary reformer all load the common alumina base sulfur recovery catalyst LS-300 of research institute of asphalt in Shenli Refinery of China Petrochemical Industry exploitation.After sulphur secondary processed, the rate of recovery is as shown in table 4.
Table 4 different catalysts grating test-results
| Embodiment 10 | Embodiment 11 | Embodiment 12 | |
| The rate of recovery after sulphur secondary processed, % | 96.0 | 96.3 | 95.0 |
As can be seen from Table 4, after the sulphur secondary processed of embodiment 10 and embodiment 11, the rate of recovery is apparently higher than embodiment 12, this is because embodiment 10 and embodiment 11 have loaded the multi-functional sulfur recovery catalyst of LS-981 that part has omitted oxygen function in catalyzer grading distribution scheme, avoid the infringement that the leakage oxygen in molten sulfur degasification waste gas causes catalyst performance, this catalyzer has higher hydrolytic activity simultaneously, also improves the rate of recovery after the sulphur secondary processed of device.
Claims (10)
1. one kind is reduced sulfur recovery facility SO
2the technique of emission concentration, comprise the thermal response stage, catalytic reaction stages and tail gas clean-up treatment stage, it is characterized in that,
The Claus tail gases that catalytic reaction stages produces is tail gas clean-up treatment stage, successively through hydrogenation reaction, quench tower is lowered the temperature, after amine absorption, Partial cleansing tail gas is as the gas stripping gas of molten sulfur degasification, all the other cleaning of off-gas are introduced incinerator and are burned, molten sulfur degasification waste gas is divided into two portions, what a part and the Reaktionsofen tail gas to produce through the thermal response stage were mixed into catalytic reaction stages carries out two-stage catalytic treatment, the secondary catalyzed reaction that tail gas after the one stage catalyzing process of another part and catalytic reaction stages is mixed into catalytic reaction stages processes, the amine liquid of absorbing hydrogen sulphide enters regenerator column and regenerates, regenerated acidic gas mixes with raw material sour gas, return to thermal response section and reclaim elementary sulfur further.
2. the technique of reduction sulfur recovery facility SO2 emission concentration according to claim 1, is characterized in that,
The described thermal response stage: hydrogen sulfide containing sour gas obtains elementary sulfur and Reaktionsofen tail gas through the thermal response stage;
Described catalytic reaction stages: Reaktionsofen tail gas is in catalytic reaction stages after Crouse's catalyzed conversion, and the treatment stage that Claus tail gases entering tail gas clean-up, catalytic reaction stages divides two-stage catalytic treatment.
3. the technique of reduction sulfur recovery facility SO2 emission concentration according to claim 1 and 2, it is characterized in that, the part that described molten sulfur degasification waste gas carries out two-stage catalytic treatment and the part of secondary catalyzed reaction process entering catalytic reaction stages, both volume ratios are 1:1.
4. reduction sulfur recovery facility SO according to claim 1 and 2
2the technique of emission concentration, it is characterized in that, the concrete steps of the two-stage catalytic treatment of described catalytic reaction stages are: gas enters the one-level convertor of catalytic reaction stages, react under catalyst action, generting element sulphur and one-level convertor tail gas, elementary sulfur enters the recovery of molten sulfur pond and obtains Molten sulphur, one-level convertor tail gas enters secondary reformer reaction, under catalyst action after Claus catalyzed conversion, elementary sulfur enters the recovery of molten sulfur pond and obtains Molten sulphur, the treatment stage that the Claus tail gas after catalyzed reaction entering tail gas clean-up.
5. reduction sulfur recovery facility SO according to claim 1 and 2
2the technique of emission concentration, is characterized in that, in the treatment stage of described tail gas clean-up, Claus tail gas heating temperature is 200-300 DEG C.
6. reduction sulfur recovery facility SO according to claim 1 and 2
2the technique of emission concentration, is characterized in that, in the treatment stage of described tail gas clean-up, quench tower is cooled to 25-42 DEG C.
7. reduction sulfur recovery facility SO according to claim 1 and 2
2the technique of emission concentration, is characterized in that, uses compound highly effective sweetening agent in the treatment stage of described tail gas clean-up in amine absorption tower, described compound highly effective sweetening agent at absorption temperature 25-42 DEG C, hydrogenation tail gas H
2s content 0-5(v/v) %, under the operating mode of gas-liquid volume ratio 0-500, ensure de-after purification tail gas H
2s content is less than 50ppm (v).
8. reduction sulfur recovery facility SO according to claim 1 and 2
2the technique of emission concentration, is characterized in that, introducing molten sulfur pond in the treatment stage of described tail gas clean-up as the introduction volume of the cleaning of off-gas of the gas stripping gas of molten sulfur degasification is 300 ~ 1000Nm
3/ h.
9. reduction sulfur recovery facility SO according to claim 1 and 2
2the technique of emission concentration, is characterized in that, H in gas stripping gas in the treatment stage of described tail gas clean-up
2s content is less than 50ppm (v).
10. reduction sulfur recovery facility SO according to claim 9
2the technique of emission concentration, is characterized in that, H in gas stripping gas in the treatment stage of described tail gas clean-up
2s content is less than 10ppm (v).
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| CN112648628A (en) * | 2019-10-10 | 2021-04-13 | 中国石油化工股份有限公司 | Ultralow-sulfur emission process for flue gas of sulfur recovery device |
| CN113860266A (en) * | 2020-06-30 | 2021-12-31 | 中国石油化工股份有限公司 | Startup method of sulfur recovery process |
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