CN110864561A - Tail gas purification process method and device for titanium dioxide calcining kiln adopting sulfuric acid method - Google Patents
Tail gas purification process method and device for titanium dioxide calcining kiln adopting sulfuric acid method Download PDFInfo
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- CN110864561A CN110864561A CN201911136999.1A CN201911136999A CN110864561A CN 110864561 A CN110864561 A CN 110864561A CN 201911136999 A CN201911136999 A CN 201911136999A CN 110864561 A CN110864561 A CN 110864561A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/10—Combinations of devices covered by groups B01D45/00, B01D46/00 and B01D47/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/0014—Devices for monitoring temperature
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention relates to the technical field of chemical purification, in particular to a tail gas purification device and a tail gas purification method for a titanium white calcining kiln adopting a sulfuric acid method. A tail gas purification process method for a titanium white calcining kiln adopting a sulfuric acid method comprises three purification processes of primary treatment of large particle dust of tail gas of a metatitanic acid calcining kiln, fine treatment of tail gas of the metatitanic acid calcining kiln and washing and emptying of alkali liquor. The invention has the advantages that: reduce the dust content in the tail gas, avoid the washing away of large granule dust to the metal fiber filter bag to reduce the dust removal volume of metal fiber filter bag, reduce the blowback number of times, prolong the life-span of metal fiber filter bag dust remover, avoid low temperature tail gas to get into the metal fiber filter bag dust remover, at metal filter bag surface dewfall, paste the membrane, and cause the corruption of metal fiber filter bag.
Description
Technical Field
The invention relates to the technical field of chemical purification, in particular to a tail gas purification process method and a tail gas purification device for a titanium white calcining kiln adopting a sulfuric acid method.
Background
The metatitanic acid calcination is an important link in the production process of titanium dioxide by a sulfuric acid method, and the calcination tail gas has the characteristics of high dust content of 5000-plus 50000mg/Nm3, mainly TiO2, high SO2 content of 8000-plus 15000mg/Nm3, water content of 20-30% and the like. Due to the high sulfur and water content of the dust, the dew point temperature of the tail gas is between 230 ℃ and 260 ℃.
A titanium white powder calcines dry process dust collecting system CN 209128054 among the prior art, application number 201821529980, a titanium white powder calcines dry process dust collecting system, including the preprocessing device that connects gradually, calcine preceding processing apparatus, calcine dust collector and calcine aftertreatment device, calcine dust collector and include the rotary kiln, the rotary kiln is connected with dry dust collector, dry dust collector includes the ash bucket of box, air intake, air outlet, jetting pipe, filter core and back taper, the filter core is made by stainless steel fiber felt, be connected with the defeated material equipment that the level set up between ash bucket lower extreme and the diolame equipment, defeated material equipment includes defeated pipeline and installs the defeated material axle of spiral in defeated pipeline, the defeated material axle of spiral is connected with driving motor. When tail gas is treated, the service life of the metal fiber filter bag dust remover is low due to the fact that large-particle dust cannot be treated, and when low-temperature tail gas enters the metal fiber filter bag dust remover, dewing and film pasting are carried out on the surface of a metal fiber filter bag, and the metal fiber filter bag is corroded.
Disclosure of Invention
The first purpose of the invention is to provide a tail gas purification process method of a titanium dioxide calcining kiln by a sulfuric acid method, which overcomes the defects in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a tail gas purification process method for a titanium dioxide calcining kiln by a sulfuric acid method is characterized by comprising the following steps: the method comprises three purification processes of primary treatment of large particle dust in metatitanic acid calcining kiln tail gas, fine treatment of metatitanic acid calcining kiln tail gas and washing and emptying treatment of alkali liquor, and specifically comprises the following steps:
(1) metatitanic acid enters the rotary kiln through a feed inlet of the rotary kiln, a burner connected with a kiln head of the rotary kiln sprays fuel gas into the rotary kiln, high-temperature flue gas is generated in a combustion chamber and a mixing chamber specially arranged for the rotary kiln, the high-temperature flue gas is discharged through a kiln tail of the rotary kiln after heat exchange along a rotary kiln barrel, the temperature of the discharged tail gas is 300-500 ℃, the tail gas of the calcining kiln directly enters a cyclone dust collector after being discharged, TiO2 dust with larger granularity is removed, the tail gas enters an ash bin, and the temperature of the tail gas is reduced to 30-50 ℃ after passing through the cyclone dust collector.
(2) The flue gas of the primary dust removal, namely the tail gas of the cyclone dust remover enters a metal filter bag dust remover for tight dust removal, and the TiO2 dust with fine granularity is removed and enters an ash bin; the dust content of the tail gas after dust removal is less than 10mg/Nm3, and the temperature is reduced to 30-50 ℃. The tail gas dedusted by the metal filter bag deduster can be returned to the kiln head of the rotary kiln for heat recovery, can also be subjected to desulfurization and denitrification and then is exhausted, and can also be subjected to acid mist washing to recover SO2 and heat therein.
(3) When the temperature of tail gas of the calcining kiln is lower than 330 ℃ or the temperature of tail gas of the cyclone dust collector is lower than 300 ℃, tail gas is switched into an accident chimney, alkali liquor is introduced to wash and absorb dust, SO2 and NOx in the tail gas, and the tail gas is emptied after the tail gas is qualified.
The utility model provides a sulfuric acid process titanium dioxide calcining kiln tail gas cleanup unit which characterized in that: including metatitanic acid calcining kiln, cyclone, metal filter bag dust remover, accident chimney, alkali lye absorber and ash bin, cyclone is being connected to metatitanic acid calcining kiln's kiln tail department, the ash bin is being connected to cyclone one end, and the metal filter bag dust remover is being connected to the other end, just accident chimney and alkali lye absorber set up at the metal filter bag dust remover with between the cyclone, the accident chimney can avoid low temperature tail gas to get into the metal filter bag dust remover, metal filter bag dust remover one side connect in metatitanic acid calcining kiln hood, the opposite side of metal filter bag dust remover is connected with SOx/NOx control device and acid mist washing equipment.
And a tail gas temperature monitor for detecting the temperature of the tail gas is arranged at the kiln tail of the metatitanic acid calcining kiln.
And a tail gas temperature monitor for detecting the temperature of the tail gas is arranged at the tail part of the cyclone dust collector.
The invention has the beneficial effects that:
1. the cyclone dust collector aims to remove particles with larger granularity in tail gas of a calcining kiln, reduce dust content in the tail gas, avoid scouring of large-particle dust on a metal fiber filter bag, reduce dust removal amount of the metal fiber filter bag, reduce blowback times and prolong service life of the metal fiber filter bag dust collector.
2. The accident chimney aims to prevent low-temperature tail gas from entering the metal fiber filter bag dust remover, and dewing and pasting films on the surface of the metal filter bag and causing corrosion of the metal filter bag.
3. And titanium dioxide particles in the tail gas are recycled, so that air pollution is reduced.
Drawings
FIG. 1 is a schematic process flow diagram of a tail gas purification process method of a titanium dioxide calcining kiln by a sulfuric acid method;
FIG. 2 is a schematic view of a device for purifying tail gas of a titanium dioxide calcining kiln by a sulfuric acid method;
in the figure: 1. metatitanic acid calcining kiln; 2. a cyclone dust collector; 3. a metal filter bag dust remover; 4. an accident chimney; 5. an alkali liquor absorber; 6. an ash bin; 7. a desulfurization and denitrification device; 8. acid mist washing equipment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 and 2, a tail gas purification process method for a titanium white calcining kiln by a sulfuric acid method comprises three purification processes of large particle dust preliminary treatment of tail gas of a metatitanic acid calcining kiln, tail gas fine treatment of the metatitanic acid calcining kiln and washing and emptying of alkali liquor, and specifically comprises the following steps:
1. metatitanic acid enters the rotary kiln through a feed inlet of the rotary kiln, a burner connected with a kiln head of the rotary kiln sprays fuel gas into the rotary kiln, high-temperature flue gas is generated in a combustion chamber and a mixing chamber specially arranged for the rotary kiln, the high-temperature flue gas is discharged through a kiln tail of the rotary kiln after heat exchange along a rotary kiln barrel, the temperature of the discharged tail gas is 300-500 ℃, the tail gas of the calcining kiln directly enters a cyclone dust collector after being discharged, TiO2 dust with larger granularity is removed, the tail gas enters an ash bin, and the temperature of the tail gas is reduced to 30-50 ℃ after passing through the cyclone dust collector.
2. The flue gas of the primary dust removal, namely the tail gas of the cyclone dust remover enters a metal filter bag dust remover for tight dust removal, and the TiO2 dust with fine granularity is removed and enters an ash bin; the dust content of the tail gas after dust removal is less than 10mg/Nm3, and the temperature is reduced to 30-50 ℃. The tail gas dedusted by the metal filter bag deduster can be returned to the kiln head of the rotary kiln for heat recovery, can also be subjected to desulfurization and denitrification and then is exhausted, and can also be subjected to acid mist washing to recover SO2 and heat therein.
3. When the temperature of tail gas of the calcining kiln is lower than 330 ℃ or the temperature of tail gas of the cyclone dust collector is lower than 300 ℃, tail gas is switched into an accident chimney, alkali liquor is introduced to wash and absorb dust, SO2 and NOx in the tail gas, and the tail gas is emptied after the tail gas is qualified.
The utility model provides a sulfuric acid process titanium dioxide calcining kiln tail gas cleanup unit which characterized in that: including metatitanic acid calcining kiln 1, cyclone 2, metal filter bag dust collector 3, accident chimney 4, alkali lye absorber 5 and ash bin 6, cyclone 2 is being connected to metatitanic acid calcining kiln 1's kiln tail department, ash bin 6 is being connected to cyclone 2 one end, and metal filter bag dust collector 3 is being connected to the other end, just accident chimney 4 and alkali lye absorber 5 set up at metal filter bag dust collector 3 with between the cyclone 2, accident chimney 4 can avoid low temperature tail gas to get into metal filter bag dust collector 3, 3 one sides of metal filter bag dust collector connect in 1 kiln head of metatitanic acid calcining kiln, the opposite side of metal filter bag dust collector 3 is connected with SOx/NOx control device 7 and acid mist washing equipment 8. The cyclone dust collector aims to remove particles with larger granularity in tail gas of a calcining kiln, reduce dust content in the tail gas, avoid scouring of large-particle dust on a metal fiber filter bag, reduce dust removal amount of the metal fiber filter bag, reduce blowback times and prolong service life of the metal fiber filter bag dust collector. The accident chimney aims to prevent low-temperature tail gas from entering the metal fiber filter bag dust remover, and dewing and pasting films on the surface of the metal filter bag and causing corrosion of the metal filter bag. And (3) recycling titanium dioxide particles in the tail gas, and reducing air pollution, wherein a tail gas temperature monitor for detecting the temperature of the tail gas is arranged at the kiln tail of the metatitanic acid calcining kiln 1. And a tail gas temperature monitor for detecting the temperature of the tail gas is arranged at the tail part of the cyclone dust collector 2. The tail gas temperature monitor is used for detecting the real-time temperature of tail gas transmission.
The above examples are intended to further illustrate the present invention, but are not intended to limit the invention to these specific embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be understood to be within the protection scope of the present invention.
Claims (4)
1. A tail gas purification process method for a titanium dioxide calcining kiln by a sulfuric acid method is characterized by comprising the following steps: the method comprises three purification processes of primary treatment of large particle dust in metatitanic acid calcining kiln tail gas, fine treatment of metatitanic acid calcining kiln tail gas and washing and emptying treatment of alkali liquor, and specifically comprises the following steps:
(1) metatitanic acid enters the rotary kiln through a feed inlet of the rotary kiln, a burner connected with a kiln head of the rotary kiln sprays fuel gas into the rotary kiln, high-temperature flue gas is generated in a combustion chamber and a mixing chamber specially arranged for the rotary kiln, the high-temperature flue gas is discharged through a kiln tail of the rotary kiln after heat exchange along a rotary kiln barrel, the temperature of the discharged tail gas is 300-500 ℃, the tail gas of the calcining kiln directly enters a cyclone dust collector after being discharged, TiO2 dust with larger granularity is removed, the tail gas enters an ash bin, and the temperature of the tail gas is reduced to 30-50 ℃ after passing through the cyclone dust collector.
(2) The flue gas of the primary dust removal, namely the tail gas of the cyclone dust remover enters a metal filter bag dust remover for tight dust removal, and the TiO2 dust with fine granularity is removed and enters an ash bin; the dust content of the tail gas after dust removal is less than 10mg/Nm3, and the temperature is reduced to 30-50 ℃. The tail gas dedusted by the metal filter bag deduster can be returned to the kiln head of the rotary kiln for heat recovery, can also be subjected to desulfurization and denitrification and then is exhausted, and can also be subjected to acid mist washing to recover SO2 and heat therein.
(3) When the temperature of tail gas of the calcining kiln is lower than 330 ℃ or the temperature of tail gas of the cyclone dust collector is lower than 300 ℃, tail gas is switched into an accident chimney, alkali liquor is introduced to wash and absorb dust, SO2 and NOx in the tail gas, and the tail gas is emptied after the tail gas is qualified.
2. The utility model provides a sulfuric acid process titanium dioxide calcining kiln tail gas cleanup unit which characterized in that: comprises a metatitanic acid calcining kiln (1), a cyclone dust collector (2), a metal filter bag dust collector (3), an accident chimney (4), an alkali liquor absorber (5) and an ash bin (6), the kiln tail of the metatitanic acid calcining kiln (1) is connected with a cyclone dust collector (2), one end of the cyclone dust collector (2) is connected with the ash bin (6), the other end is connected with the metal filter bag dust collector (3), and the accident chimney (4) and the alkali liquor absorber (5) are arranged between the metal filter bag dust collector (3) and the cyclone dust collector (2), the accident chimney (4) can prevent low-temperature tail gas from entering the metal filter bag dust collector (3), one side of the metal filter bag dust remover (3) is connected with the kiln head of the metatitanic acid calcining kiln (1), and the other side of the metal filter bag dust remover (3) is connected with a desulfurization and denitrification device (7) and acid mist washing equipment (8).
3. The tail gas purification device for the titanium dioxide calcining kiln by the sulfuric acid method according to claim 2, which is characterized in that: and a tail gas temperature monitor for detecting the temperature of the tail gas is arranged at the kiln tail of the metatitanic acid calcining kiln (1).
4. The tail gas purification device for the titanium dioxide calcining kiln by the sulfuric acid method according to claim 2, which is characterized in that: and a tail gas temperature monitor for detecting the temperature of the tail gas is arranged at the tail part of the cyclone dust collector (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911136999.1A CN110864561A (en) | 2019-11-19 | 2019-11-19 | Tail gas purification process method and device for titanium dioxide calcining kiln adopting sulfuric acid method |
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| CN201911136999.1A CN110864561A (en) | 2019-11-19 | 2019-11-19 | Tail gas purification process method and device for titanium dioxide calcining kiln adopting sulfuric acid method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111664716A (en) * | 2020-04-10 | 2020-09-15 | 安徽迪诺环保新材料科技有限公司 | Method for utilizing waste heat of calcining tail gas in titanium dioxide production by sulfuric acid process |
| CN112263901A (en) * | 2020-10-23 | 2021-01-26 | 深圳市凯盛科技工程有限公司 | Titanium white powder production line flue gas waste heat utilization system |
| CN114832565A (en) * | 2021-02-01 | 2022-08-02 | 西南交通大学 | Intelligent treatment device and method for dust and harmful gas in underground engineering construction |
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| CN104445391A (en) * | 2014-10-31 | 2015-03-25 | 天津市凯特隆焊接材料有限公司 | Process for calcining metatitanic acid in titanium dioxide production |
| CN106247791A (en) * | 2016-09-29 | 2016-12-21 | 济南裕兴化工有限责任公司 | There is titanium workshop rotary kiln and the method for waste heat from tail gas reuse function |
| CN108002438A (en) * | 2017-11-29 | 2018-05-08 | 广西雅照钛白有限公司 | A kind of sulfuric acid hair prepares titanium dioxide calcination rotary kiln feed process |
| CN109437295A (en) * | 2018-09-29 | 2019-03-08 | 广东惠云钛业股份有限公司 | Sulfate process titanium dioxide calciner plant and method |
| CN211177990U (en) * | 2019-11-19 | 2020-08-04 | 中环环工设备无锡有限公司 | Kiln tail gas cleanup unit is calcined to sulfuric acid process titanium dioxide |
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2019
- 2019-11-19 CN CN201911136999.1A patent/CN110864561A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1793388A (en) * | 2005-11-18 | 2006-06-28 | 重庆钢铁(集团)有限责任公司 | Tech. of blast furnace gas drying bag dust removing |
| CN104445391A (en) * | 2014-10-31 | 2015-03-25 | 天津市凯特隆焊接材料有限公司 | Process for calcining metatitanic acid in titanium dioxide production |
| CN106247791A (en) * | 2016-09-29 | 2016-12-21 | 济南裕兴化工有限责任公司 | There is titanium workshop rotary kiln and the method for waste heat from tail gas reuse function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111664716A (en) * | 2020-04-10 | 2020-09-15 | 安徽迪诺环保新材料科技有限公司 | Method for utilizing waste heat of calcining tail gas in titanium dioxide production by sulfuric acid process |
| CN112263901A (en) * | 2020-10-23 | 2021-01-26 | 深圳市凯盛科技工程有限公司 | Titanium white powder production line flue gas waste heat utilization system |
| CN114832565A (en) * | 2021-02-01 | 2022-08-02 | 西南交通大学 | Intelligent treatment device and method for dust and harmful gas in underground engineering construction |
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