CN110793044A - Incineration device and method for treating sulfur recovery tail gas - Google Patents
Incineration device and method for treating sulfur recovery tail gas Download PDFInfo
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- CN110793044A CN110793044A CN201910984636.7A CN201910984636A CN110793044A CN 110793044 A CN110793044 A CN 110793044A CN 201910984636 A CN201910984636 A CN 201910984636A CN 110793044 A CN110793044 A CN 110793044A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/20—Waste heat recuperation using the heat in association with another installation
- F23G2206/201—Waste heat recuperation using the heat in association with another installation with an industrial furnace
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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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
Abstract
An incineration device and method for treating sulfur recovery tail gas, which belong to the technical field of chemical industry. The device adopts a low NOx burner, and can control the NOx content to be less than 100mg/m by controlling the oxygen deficiency3(ii) a The invention adopts the air preheater to heat the combustion-supporting air, can save 20 to 30 percent of fuel, and also adopts the waste heat boiler to recover the waste heat in the flue gas, and the arrangement of the waste heat boiler and the waste heat boilerThe device has the purpose of energy saving; the invention adopts the central pipe regulating valve of the waste heat boiler to regulate the heat exchange smoke gas quantity and simultaneously improves the operation pressure of steam, thereby ensuring that the smoke gas temperature is higher than the acid dew point temperature and effectively preventing the acid corrosion of equipment; the invention adopts the induced draft fan to ensure the negative pressure of the whole system, prevents the leakage of harmful gas and is safer.
Description
Technical Field
The invention relates to an incineration device and method for treating sulfur recovery tail gas, and belongs to the technical field of chemical industry.
Background
With the rapid development of the industries such as petrochemical industry, coal chemical industry, natural gas purification and the like in China, a sulfur recovery device matched with the equipment generates a large amount of tail gas which is discharged into the atmosphere and contains H2S、SO2S simple substance and CS2And the like, causing serious environmental pollution.
Meanwhile, due to the rapid development of society, people in modern society pay more attention to environmental protection, and various regulations related to environmental protection are proposed around the world.
The national environmental protection department 2015, 5 months and 16 days releases the discharge standards of pollutants for the petroleum refining industry (GB31570) and the discharge standards of pollutants for the petrochemical industry (GB31571), and the standards stipulate SO2Emission limit of 100mg/m3NOx emission limit of 150mg/m3In particular region of SO2Emission limit of (2) is 50mg/m3NOx emission limit of 100mg/m3. And the new enterprise is specified to execute the standard in 2015, 7, month and 1, and the existing enterprise executes the standard in 2017, 7, month and 1.
SO regulated in Integrated emission Standard for atmospheric pollutants (GB16297)2Emission limit 960mg/m3NOx emission limit of 1400mg/m3The emission requirement in the new standard is far less than the value, and in order to meet the requirement of the new standard, not only the tail gas of a newly-built sulfur recovery device is required to reach the emission standard, but also hundreds of sulfur recovery devices built in China are required to be correspondingly provided with tail gas treatment facilities.
The sulfur recovery tail gas treatment process mainly comprises the following steps:
1. sulfur recovery tail gas → hydrogenation reduction → SCOT → tail gas incineration
The process comprises mixing S-containing components such as SO in the tail gas2S simple substance, CS2Etc. are reduced to H by hydrogenation2S, then absorbing H by amine liquid2Desorbing after S to desorb the H2S is recycled to the sulfur recovery unit as a raw material.
The problem with this process is that ①, due to the limited performance of the catalyst, there is still some SO after passing through the hydrogenation reactor 2② part of H in tail gas is still left because of reaction equilibrium2S is not absorbed, and this part of the hydrogen sulfide is also mixed into the incineration apparatus. Thereby leading to SO after tail gas incineration2The content is 450mg/m3The above.
2. Sulfur recovery tail gas → catalytic oxidation → tail gas incineration
The process is to selectively oxidize catalyst to remove H in tail gas2S is oxidized into S simple substance, and the tail gas after the S simple substance is separated enters a tail gas incineration device.
The process has the following problems: due to the limitation of the performance of the selective oxidation catalyst, the improvement degree of the conversion rate is limited, and about 1 percent of sulfide still enters a tail gas incineration device, SO in the discharged flue gas2Can not reach the discharge standard.
3. Sulfur recovery tail gas → tail gas incineration → acid gas absorption
The process is to make the catalyst contain H2S、SO2S simple substance and CS2The tail gas containing harmful substances is directly subjected to high-temperature oxidation to oxidize S-containing substances into SO2Containing SO2The flue gas is absorbed by alkali liquor/ammonia liquorFinally, SO is caused to be2Discharging after reaching the standard.
However, the process still has the obvious problems that ① has low heat value of the sulfur recovery tail gas, a large amount of fuel gas is needed for afterburning during incineration, the cost is high, ② often causes that NOx emission cannot reach the standard due to unreasonable design of a combustor, energy waste is caused due to the fact that waste heat in ③ flue gas is not recovered, a ④ system runs at positive pressure, harmful gas is prone to leaking, and the relevant requirements of GB18484 cannot be met.
Disclosure of Invention
The technical problem solved by the invention is as follows: the device has the advantages of high destruction rate, energy conservation, low NOx generation amount, negative pressure operation and acid dew point corrosion prevention.
The technical solution of the invention is as follows: an incineration device for treating sulfur recovery tail gas comprises an air blower, an air preheater, a burner, an incinerator, a waste heat boiler, a quencher, an alkaline washing tower, an induced draft fan, a chimney and a mixing inlet, wherein the air blower, the air preheater, the burner, the incinerator, the waste heat boiler, the quencher, the alkaline washing tower, the induced draft fan and the chimney are sequentially connected, the mixing inlet is arranged at the front end of a hearth of the incinerator, the inlet end of the mixing inlet comprises a first inlet and a second inlet, the first inlet is used for conveying the tail gas to be treated;
the blower is used for sucking air and generating combustion-supporting air to enter the air preheater;
the air preheater is used for heating combustion-supporting air to generate heated combustion-supporting air, and is divided into two paths, wherein the first path of combustion-supporting air enters the combustor, and the second path of combustion-supporting air enters the mixing inlet through the second inlet;
the combustor is used for combusting the first path of combustion-supporting air to generate combusted flue gas which enters the front end of the hearth of the incinerator;
the mixing inlet is used for inputting mixed gas comprising the second path of combustion-supporting air and tail gas to be treated into the front end of the hearth of the incinerator;
the incinerator also comprises a hearth rear end, and the combusted flue gas and the mixed gas are mixed at the front end of the hearth and then enter the hearth rear end for combustion;
the waste heat boiler is used for recovering waste heat of the mixed gas after entering the rear end of the hearth and being combusted;
the quencher is used for cooling the mixed gas after the waste heat recovery;
the alkaline washing tower is used for carrying out SO on the cooled mixed gas2Absorption;
the induced draft fan is used for carrying out SO2Inputting the absorbed mixed gas into a chimney;
chimney for carrying out SO2And discharging the absorbed mixed gas.
Furthermore, the waste heat boiler is provided with a central pipe and a central pipe regulating valve, the central pipe is connected with the inlet end and the outlet end of the waste heat boiler and used for outputting the combustion gas after combustion to the outlet end of the waste heat boiler, and the central pipe is matched with the waste heat boiler to ensure that the combustion gas after waste heat recovery is in a preset temperature range; the central tube regulating valve is used for regulating the opening and closing degree of the central tube.
Further, the preset temperature range is 230-280 ℃.
Further, the waste heat boiler recovers waste heat by a method of heating water to generate water vapor, and the pressure of the generated water vapor is not less than 1.5 MPa.g; the generated water vapor enters an air preheater to heat combustion-supporting air.
Further, the combustor is a strong swirl semi-premix type low NOx combustor.
Furthermore, the excess air coefficient α of the strong swirl semi-premix type low NOx burner is 0.70-0.80.
Further, the temperature of the mixed gas entering the rear end of the hearth and combusted is 500-760 ℃, wherein the dry basis O is2The volume fraction of (A) is 3-6%.
Further, the temperature of the heated combustion-supporting air is 160-280 ℃.
Further, the mixed gas after waste heat recovery is cooled to 60-80 ℃ by the quencher.
The incineration method for treating the sulfur recovery tail gas based on the incineration device for treating the sulfur recovery tail gas comprises the following steps:
the blower sucks air to generate combustion-supporting air to enter the air preheater;
the air preheater heats combustion-supporting air to generate heated combustion-supporting air, and the heated combustion-supporting air is divided into two paths, wherein the first path of combustion-supporting air enters the combustor, and the second path of combustion-supporting air enters the second inlet of the mixing inlet through the second inlet;
the combustor combusts the first path of combustion-supporting air to generate combusted flue gas which enters the front end of a hearth of the incinerator;
conveying tail gas to be treated from a first inlet of the mixing inlet, and inputting mixed gas comprising second path combustion-supporting air and the tail gas to be treated into the front end of a hearth of the incinerator;
the incinerator mixes the burned flue gas and the mixed gas at the front end of the hearth and then enters the rear end of the hearth for burning;
the waste heat boiler recovers waste heat of the mixed gas which enters the rear end of the hearth and is combusted;
the mixed gas after the waste heat recovery is cooled by the quencher;
carrying out SO on the cooled mixed gas by the alkaline washing tower2Absorption;
the induced draft fan carries out SO2Inputting the absorbed mixed gas into a chimney;
chimney will carry out SO2And discharging the absorbed mixed gas.
Compared with the prior art, the invention has the advantages that:
(1) the invention adopts a low NOx burner, and can control the NOx content to be less than 100mg/m by controlling the oxygen shortage3；
(2) The invention adopts the air preheater to heat the combustion-supporting air, can save 20 percent to 30 percent of fuel, and also adopts the waste heat boiler to recover the waste heat in the flue gas, and the arrangement of the waste heat boiler and the waste heat boiler achieves the purpose of saving energy;
(3) the invention adopts the central pipe regulating valve of the waste heat boiler to regulate the heat exchange smoke gas quantity and simultaneously improves the operation pressure of steam, thereby ensuring that the smoke gas temperature is higher than the acid dew point temperature and effectively preventing the acid corrosion of equipment;
(4) the invention adopts the induced draft fan to ensure the negative pressure of the whole system, prevents the leakage of harmful gas and is safer.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Detailed Description
The invention will be further explained and explained with reference to preferred embodiments of the invention and the attached drawings.
As shown in figure 1, the incineration device for treating the sulfur recovery tail gas comprises an air blower 1, an air preheater 2, a combustor 3, an incinerator 5, a waste heat boiler 6, a quencher 8, an alkaline tower 9, an induced draft fan 10 and a chimney 11 which are sequentially connected, and a mixing inlet 4 arranged at the front end of a hearth of the incinerator 5, wherein the inlet end of the mixing inlet 4 comprises a first inlet and a second inlet, the first inlet is used for conveying the tail gas to be treated, and the second inlet is connected with the outlet end of the air preheater 2.
Firstly, a blower 1 is used for sucking air and generating combustion-supporting air to enter an air preheater 2;
and the air preheater 2 is used for heating combustion-supporting air to generate heated combustion-supporting air, and is divided into two paths, wherein the first path of combustion-supporting air enters the combustor 3, and the second path of combustion-supporting air enters the mixing inlet 4 through the second inlet.
Preferably, steam generated by the waste heat boiler 6 is used for heating combustion-supporting air at the outlet of the blower 1 to 160-280 ℃, so that the consumption of fuel gas is reduced, and the energy-saving fuel gas is about 20-30%.
And thirdly, the combustor 3 is used for combusting the first path of combustion-supporting air to generate combusted flue gas which enters the front end of a hearth of the incinerator 5.
Specifically, the combustor 3 is positioned at the front end of the incinerator 5, a primary combustion air inlet and a fuel gas spray gun are arranged on the combustor, the generation of NOx is restrained to the maximum extent by controlling the excess air coefficient α to be 0.70-0.80 in the combustor, and the content of NOx can be controlled to be less than 100mg/m3。
Preferably, the combustor 3 is a strong swirl semi-premix low NOx combustor, and the excess air factor α is 0.70-0.80.
The mixing inlet 4 is used for inputting mixed gas comprising the second path of combustion-supporting air and tail gas to be treated into the front end of a hearth of the incinerator 5;
fifthly, the incinerator 5 further comprises a hearth rear end, and the high-temperature flue gas after combustion and the mixed gas are mixed at the front end of the hearth and then enter the hearth rear end for combustion.
Specifically, the inner wall of the incinerator 5 is laid with refractory materials, secondary combustion-supporting air and tail gas enter a hearth through an inlet 4 at the front end of the incinerator 5 behind the burner 3, a certain space is reserved for fully mixing high-temperature flue gas generated by the burner with sulfur-containing tail gas and secondary combustion-supporting air, the fully mixed flue gas enters the rear section of the incinerator for fully burning, the burning efficiency is higher than 99.9%, and the burning removal rate is higher than 99.99%.
Preferably, the tail temperature of the incinerator is between 500 and 760 ℃, and dry basis O in the flue gas2The content (volume fraction) is between 3 and 6 percent.
And sixthly, the waste heat boiler 6 is used for recovering waste heat of the combusted mixed gas.
The waste heat boiler recovers waste heat by adopting a method of heating water to generate steam (steam), and the pressure of the generated steam is not less than 1.5 MPa.g; the generated water vapor enters an air preheater to heat combustion-supporting air. Preferably, the waste heat in the flue gas is recovered through the waste heat boiler 6 to generate steam, and the steam is used for the air preheater 2 to heat combustion-supporting air, so that the purpose of energy conservation is achieved. In order to prevent acid dew point corrosion, the rated pressure of steam is more than or equal to 1.5MPa.
Preferably, the waste heat boiler 6 is provided with a central pipe and the central pipe is provided with a regulating valve 7, so that the temperature of the flue gas at the outlet of the waste heat boiler 6 is kept between 230 ℃ and 280 ℃ and is higher than the acid dew point temperature under any load. The temperature of the flue gas after the waste heat boiler 6 is 230-280 ℃, and the rated pressure of the produced steam is more than or equal to 1.5MPa.
Seventhly, the quencher 8 is used for cooling the mixed gas after waste heat recovery;
eighthly, the alkaline washing tower 9 is used for carrying out SO on the cooled mixed gas2And (4) absorbing.
Preferably, in order to protect the alkaline tower and open an alkaline washing temperature window, the hot flue gas is cooled to 60-80 ℃ by a quencher 8 and then enters the alkaline tower 9.
Preferably, the alkaline tower 9 is a packed tower, and a demisting device is arranged in the tower. The alkaline tower 9 is provided with a filler, and SO is ensured through multi-stage absorption2The content is less than 50mg/m3。
Ninthly, the induced draft fan 10 is used for carrying out SO2The absorbed mixed gas is input to a chimney 11.
Preferably, the induced draft fan 10 ensures the negative pressure operation of the whole system, can prevent the harmful gas from leaking, and makes the system safer and more reliable. The flue gas after reaching the standard is finally discharged into the atmosphere through a chimney 11, and the height of the chimney meets the standard requirement.
Tenthly, the chimney 11 is used for carrying out SO2And discharging the absorbed mixed gas. SO in flue gas discharged from chimney 112The content is less than 50mg/m3NOx content < 100mg/m3。
The invention adopts the NOx burner to control the NOx content at 100mg/m while realizing the complete decomposition of the organic matters in the sulfur recovery tail gas3Hereinafter, and fuel is saved by 20% by heating the combustion air. In addition, the waste heat of the flue gas is recovered through a waste heat boiler, and the acid dew point corrosion of equipment is prevented by arranging a central pipe adjusting device and increasing the steam operation pressure while further saving energy. And finally, the flue gas is discharged into a chimney through a draught fan after being subjected to quenching and alkali washing, and the whole system runs under negative pressure, so that the harmful gas is prevented from leaking, and the system is safer and more reliable.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. The utility model provides a handle incineration device of sulphur recovery tail gas which characterized in that: the device comprises an air blower (1), an air preheater (2), a burner (3), an incinerator (5), a waste heat boiler (6), a quencher (8), an alkaline washing tower (9), an induced draft fan (10) and a chimney (11) which are sequentially connected, and a mixing inlet (4) arranged at the front end of a hearth of the incinerator (5), wherein the inlet end of the mixing inlet (4) comprises a first inlet and a second inlet, the first inlet is used for conveying tail gas to be treated, and the second inlet is connected with the outlet end of the air preheater (2);
the air blower (1) is used for sucking air and generating combustion-supporting air to enter the air preheater (2);
the air preheater (2) is used for heating combustion-supporting air to generate heated combustion-supporting air and is divided into two paths, the first path of combustion-supporting air enters the combustor (3), and the second path of combustion-supporting air enters the mixing inlet (4) through the second inlet;
the combustor (3) is used for combusting the first path of combustion-supporting air to generate combusted flue gas which enters the front end of a hearth of the incinerator (5);
the mixing inlet (4) is used for inputting mixed gas comprising a second path of combustion-supporting air and tail gas to be treated into the front end of a hearth of the incinerator (5);
the incinerator (5) also comprises a hearth rear end, and the combusted flue gas and the mixed gas are mixed at the front end of the hearth and then enter the hearth rear end for combustion;
the waste heat boiler (6) is used for recovering waste heat of the mixed gas which enters the rear end of the hearth and is combusted;
the quencher (8) is used for cooling the mixed gas after the waste heat recovery;
the alkaline washing tower (9) is used for carrying out SO on the cooled mixed gas2Absorption;
the induced draft fan (10) is used for carrying out SO2The absorbed mixed gas is input into a chimney (11);
a chimney (11) for conducting SO2And discharging the absorbed mixed gas.
2. An incinerator for treating sulfur recovery tail gas as claimed in claim 1, wherein: the waste heat boiler (6) is provided with a central pipe and a central pipe regulating valve (7), the central pipe is connected with the inlet end and the outlet end of the waste heat boiler (6) and used for outputting the combustion gas after combustion to the outlet end of the waste heat boiler (6) and ensuring the combustion gas after waste heat recovery to be in a preset temperature range by matching with the waste heat boiler (6); the central tube adjusting valve (7) is used for adjusting the opening and closing degree of the central tube.
3. An incinerator for treating sulfur recovery tail gas as claimed in claim 2, wherein: the preset temperature range is 230-280 ℃.
4. An incinerator for treating sulfur recovery tail gas as claimed in claim 2, wherein: the waste heat boiler (6) recovers waste heat by a method of heating water to generate water vapor, and the pressure of the generated water vapor is not less than 1.5 MPa.g; the generated water vapor enters an air preheater (2) to heat combustion-supporting air.
5. The incineration device for treating the sulfur recovery tail gas as recited in any one of claims 1 to 4, wherein: the combustor (3) is a strong rotational flow semi-premixing type low NOx combustor.
6. An incinerator for treating sulfur recovery tail gas as claimed in claim 5, wherein said strong swirl semi-premixed low NOx burner has an excess air ratio α of 0.70-0.80.
7. The incineration device for treating the sulfur recovery tail gas as recited in any one of claims 1 to 4, wherein: the temperature of the mixed gas after entering the rear end of the hearth for combustion is 500-760 ℃, wherein the dry basis is O2The volume fraction of (A) is 3-6%.
8. The incineration device for treating the sulfur recovery tail gas as recited in any one of claims 1 to 4, wherein: the temperature of the heated combustion-supporting air is 160-280 ℃.
9. The incineration device for treating the sulfur recovery tail gas as recited in any one of claims 1 to 4, wherein: and the quencher (8) cools the mixed gas after the waste heat recovery to 60-80 ℃.
10. The incineration method for treating the sulfur recovery tail gas, which is realized based on the incineration device for treating the sulfur recovery tail gas as recited in any one of claims 1 to 4, is characterized by comprising the following steps:
the air blower (1) sucks air to generate combustion-supporting air to enter the air preheater (2);
the air preheater (2) heats combustion-supporting air to generate heated combustion-supporting air, and the heated combustion-supporting air is divided into two paths, wherein the first path of combustion-supporting air enters the combustor (3), and the second path of combustion-supporting air enters a second inlet of the mixing inlet (4) through a second inlet;
the combustor (3) combusts the first path of combustion-supporting air to generate combusted flue gas, and the combusted flue gas enters the front end of a hearth of the incinerator (5);
conveying tail gas to be treated from a first inlet of the mixing inlet (4), and inputting mixed gas comprising second path combustion-supporting air and the tail gas to be treated into the front end of a hearth of the incinerator (5);
the incinerator (5) mixes the burnt flue gas with the mixed gas at the front end of the hearth and then enters the rear end of the hearth for burning;
the waste heat boiler (6) recovers waste heat of the mixed gas which enters the rear end of the hearth and is combusted;
the quencher (8) cools the mixed gas after the waste heat recovery;
the alkaline tower (9) carries out SO on the cooled mixed gas2Absorption;
the induced draft fan (10) carries out SO2The absorbed mixed gas is input into a chimney (11);
the chimney (11) will be subjected to SO2And discharging the absorbed mixed gas.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339820A (en) * | 2021-06-10 | 2021-09-03 | 新疆广汇新能源有限公司 | Method and device for treating VOCs in low-temperature methanol washing tail gas |
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