CN213790883U - Flue gas de-whitening device based on semi-dry process - Google Patents
Flue gas de-whitening device based on semi-dry process Download PDFInfo
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- CN213790883U CN213790883U CN202022334737.0U CN202022334737U CN213790883U CN 213790883 U CN213790883 U CN 213790883U CN 202022334737 U CN202022334737 U CN 202022334737U CN 213790883 U CN213790883 U CN 213790883U
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- flue gas
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- sodium carbonate
- desulfurizing tower
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The utility model discloses a flue gas whiting device based on semi-dry process technology, including desulfurizing tower, electrostatic precipitator, SCR reactor, exhaust-heat boiler, SDA desulfurizing tower, bag collector and the desulfurization fan that links to each other in proper order through the pipeline, exhaust-heat boiler's high temperature section exit linkage desulfurizing tower's flue gas entry, and SCR reactor exit linkage exhaust-heat boiler's low temperature section entry, exhaust-heat boiler's low temperature section exit linkage SDA desulfurizing tower, the device still includes flue gas heater, sodium carbonate desulfurization system, sodium bicarbonate desulfurization system, pneumatic conveying system and waste bin; the device can eliminate the phenomenon of 'smoke plume', can improve the desulfurization effect, and meanwhile, the byproduct can be recycled as a glass production raw material.
Description
Technical Field
The utility model relates to a flue gas purification equipment technical field specifically is a flue gas takes off white device based on semidry process technology.
Background
The flue gas of the industrial kiln is always an important atmospheric pollution source in China, and in order to respond to increasingly strict environmental emission standards, the flue gas discharged by enterprises is the flue gas subjected to desulfurization, denitrification and dust removal. Although the traditional semi-dry desulfurization method has high desulfurization efficiency, the process requires the use of a large amount of process water, the exhaust gas temperature is low (80-130 ℃), and the smoke is accompanied with a large amount of smoke plume in winter.
Aiming at enterprises in most northern areas, taking a glass production line of a glass company in Qinhuang island as an example, the original SCR denitration and R-SDA semi-dry desulfurization method is adopted, the initial moisture content of flue gas at the outlet of a kiln is 10%, the water is added for 4-6 t in the traditional R-SDA semi-dry desulfurization method, and the moisture content in the flue gas after comprehensive desulfurization is 14-16%. In the Qinhuang island, the average outdoor temperature is about-5 ℃ in winter, and a large amount of water vapor is condensed when meeting cold air to form water mist, so that smoke has the sense of smoke plume. The nature of the "plume" is actually water mist.
The smoke plume phenomenon not only affects the visual beauty, but also a large amount of condensed water can cause the corrosion of a chimney and peripheral equipment and light pollution.
The length of the "plume" is mainly influenced by several factors:
(1) ambient temperature: the lower the ambient temperature, the longer the length of the plume. In winter with lower air temperature, the length of the wet smoke plume is much longer than that in spring and autumn.
(2) Ambient humidity: when the relative humidity of the environment is below 60%, the influence of the environmental humidity on the plume length is not obvious; when the relative humidity of the environment is higher than 60%, although the increase of the relative humidity of the smoke plume is increased in an exponential relationship, the fact that the higher environmental humidity influences the timely diffusion of the moisture in the wet smoke is shown.
(3) Flue gas flow rate: the flue gas velocity at the outlet of the chimney is related to the load of the unit. The length of the wet smoke plume gradually increases as the flue gas velocity at the outlet of the chimney increases.
(4) Flue gas temperature: the flue gas temperature is the main factor affecting the length of the wet smoke plume.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a flue gas takes off white device based on semidry process technology, the device can eliminate "plume" phenomenon to can improve desulfurization effect, the accessory substance can regard as glass raw materials for production recycle simultaneously.
The utility model provides a technical scheme that its technical problem adopted is:
a flue gas de-whitening device based on a semi-dry process comprises a desulfurizing tower, an electric dust collector, an SCR reactor, a waste heat boiler, a SDA desulfurizing tower, a bag type dust collector and a desulfurizing fan which are sequentially connected through pipelines, wherein an outlet of a high-temperature section of the waste heat boiler is connected with a flue gas inlet of the desulfurizing tower;
the sodium carbonate desulfurization system comprises a sodium carbonate powder bin, wherein a first weighing meter, a sodium carbonate dissolving tank, a sodium carbonate solution storage tank and a slurry delivery pump are sequentially connected below the sodium carbonate powder bin, a slurry spray gun is arranged at the outlet of the slurry delivery pump, and the slurry spray gun is communicated with the inlet of the desulfurization tower;
the sodium bicarbonate desulfurization system comprises a sodium bicarbonate powder bin, a second weighing meter and a grinding machine are sequentially connected below the sodium bicarbonate powder bin, and the outlet of the grinding machine is connected with a front inlet pipeline of the SDA desulfurization tower through a spray pipe;
the pneumatic ash conveying system comprises pneumatic ash conveying machines which are respectively arranged below the electric dust collector, the SDA desulfurization tower and the bag type dust collector, and each pneumatic ash conveying machine is respectively connected with the waste bin through an ash conveying pipe;
the flue gas heater is equipped with the heating spray gun including locating the heating chamber of desulfurization fan export in the heating chamber, and the heating spray gun is connected with natural gas line, still is connected with combustion-supporting fan outside the heating chamber, heating chamber exit linkage chimney.
The utility model has the advantages that:
the water is added for 4-6 t in the conventional R-SDA semi-dry desulfurization process, and the water content in the flue gas after comprehensive desulfurization is 14-16%; the utility model can be used for desulfurization only by adding water in the process of preparing the sodium carbonate solution, the total water addition amount is 0.5-1 t, the water content in the flue gas after comprehensive desulfurization is about 11%, and the water content in the flue gas can be effectively reduced; in addition, a smoke heater is arranged to raise the smoke exhaust temperature, so that the smoke plume phenomenon of smoke is eliminated; meanwhile, a sodium carbonate semi-dry method and a sodium bicarbonate dry method are adopted for desulfurization, so that the desulfurization effect is improved.
Drawings
The invention will be further described with reference to the following figures and examples:
fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic structural diagram of a sodium carbonate desulfurization system of the present invention;
FIG. 3 is a schematic diagram of the sodium bicarbonate desulfurization system of the present invention;
fig. 4 is a schematic structural diagram of the flue gas heater of the present invention.
Detailed Description
As shown in fig. 1, the utility model provides a flue gas whitening device based on semi-dry process, including desulfurizing tower 1, electrostatic precipitator 2, SCR reactor 3, exhaust-heat boiler 4, SDA desulfurizing tower 5, bag collector 6 and desulfurization fan 7 that link to each other in proper order through the pipeline, the flue gas entry of desulfurizing tower 1 is connected to the high temperature section exit of exhaust-heat boiler 4, the low temperature section entry of exhaust-heat boiler 4, the low temperature section exit linkage SDA desulfurizing tower 5 of exhaust-heat boiler 4 are connected to the SCR reactor 3 exit linkage; the device also comprises a flue gas heater 8, a sodium carbonate desulfurization system 10, a sodium bicarbonate desulfurization system 11, a pneumatic conveying system and a waste bin 13.
Referring to fig. 2, the sodium carbonate desulfurization system 10 includes a sodium carbonate powder bin 101, a first weighing meter 102, a sodium carbonate dissolving tank 103, a sodium carbonate solution storage tank 104, and a slurry delivery pump 106 are sequentially connected below the sodium carbonate powder bin 101, an outlet of the slurry delivery pump is provided with a slurry spray gun 107, and the slurry spray gun 107 is communicated with an inlet of the desulfurization tower 1.
Referring to fig. 3, the sodium bicarbonate desulfurization system 11 includes a sodium bicarbonate powder bin 111, a second weighing meter 112 and a grinder 113 are sequentially connected below the sodium bicarbonate powder bin 111, and an outlet of the grinder 113 is connected to a front inlet pipeline of the SDA desulfurization tower 5 through a spray pipe 14.
The pneumatic ash conveying system comprises pneumatic ash conveying machines 12 which are respectively arranged below the electric dust collector 2, the SDA desulfurizing tower 3 and the bag type dust collector 6, and each pneumatic ash conveying machine is respectively connected with a waste bin 13 through an ash conveying pipe.
Referring to fig. 4, the flue gas heater 8 includes a heating chamber 81 disposed at an outlet of the desulfurization fan, a heating spray gun 82 is disposed in the heating chamber 81, the heating spray gun 82 is connected to a natural gas pipeline 83, the natural gas pipeline 83 is provided with an adjusting valve 84, a combustion fan 85 is further connected outside the heating chamber, and an outlet of the heating chamber is connected to the chimney 9.
Flue gas (330-380 ℃) coming out of a high-temperature section of the waste heat boiler 4 enters the desulfurizing tower 1, a sodium carbonate solution dissolved in the sodium carbonate desulfurizing system 10 forms a fog shape through the slurry spray gun 107 and is fully mixed with the flue gas in the desulfurizing tower 1, and SO in the flue gas2Reacting with sodium carbonate. Re-entry of flue gasesThe electric dust collector 2 is charged, and the waste materials collected by the electric dust collector 2 enter a waste material system. The flue gas at the outlet of the electric dust collector 2 returns to the low-temperature section of the waste heat boiler 4 through the denitration of the SCR reactor 3.
Flue gas (180 ℃) coming out of a low-temperature section of the waste heat boiler 4 enters an original SDA (serial data architecture) desulfurization tower 5, sodium bicarbonate in a sodium bicarbonate desulfurization system 11 is ground and conveyed to a spray pipe 14 through a grinder 113, sodium bicarbonate powder is mixed with the flue gas in a flue, and SO (sulfur oxide) in the flue gas2And reacting with sodium bicarbonate to achieve the aim of further desulfurization. The flue gas enters the bag-type dust collector 6, and the collected waste material enters the waste bin 13. The back end uses a flue gas heater 8 to heat the flue gas and then discharges the flue gas into a chimney 9. The heating is carried out by burning natural gas, and the heating temperature can be adjusted by the adjusting valve 84 and the combustion fan 85.
Adding 4-6 t of water into the traditional SDA semi-dry desulfurization method, and comprehensively desulfurizing the flue gas to obtain 14-16% of water content; the utility model discloses the desulfurization technique only needs to add water at preparation sodium carbonate solution in-process, adds the water yield 0.5~1t totally, synthesizes moisture content in the desulfurization back flue gas about 11%. Can effectively reduce the moisture content in the flue gas.
The final flue gas entering the stack has a temperature of about 170 ℃. And a flue gas heater is reserved, and purified flue gas is heated when necessary, so that the exhaust gas temperature is increased by about 20 ℃, and the exhaust gas temperature of a chimney is about 190 ℃.
The flue gas de-whitening is combined with the processes of semi-dry sodium carbonate desulfurization and dry sodium bicarbonate desulfurization, so that the moisture content is reduced, and the flue gas temperature is increased, so that the flue gas is de-whitened.
The desulfurization by-product in the desulfurization scheme is mainly Na2CO3、Na2SO4Can be used as glass production raw materials for recycling, and achieves zero emission of byproducts.
The flue gas de-whitening process not only effectively reduces the smoke plume phenomenon of the flue gas, but also improves the aesthetic degree of the flue gas; on the basis, the desulfurization process is upgraded, the desulfurization efficiency is improved, and the ultralow emission of sulfide is effectively realized. And the desulfurization by-products in the desulfurization process can be recycled as glass raw materials, so that the requirement of zero emission of solid wastes can be theoretically realized.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way; the invention is not limited to the embodiments described herein, but is capable of other embodiments according to the invention, and may be used in various other applications, including, but not limited to, industrial, or industrial. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments by the technical entity of the present invention all still belong to the protection scope of the technical solution of the present invention.
Claims (1)
1. A flue gas de-whitening device based on a semi-dry process comprises a desulfurizing tower, an electric dust collector, an SCR reactor, a waste heat boiler, a SDA desulfurizing tower, a bag type dust collector and a desulfurizing fan which are sequentially connected through pipelines, wherein an outlet of a high-temperature section of the waste heat boiler is connected with a flue gas inlet of the desulfurizing tower;
the sodium carbonate desulfurization system comprises a sodium carbonate powder bin, wherein a first weighing meter, a sodium carbonate dissolving tank, a sodium carbonate solution storage tank and a slurry delivery pump are sequentially connected below the sodium carbonate powder bin, a slurry spray gun is arranged at the outlet of the slurry delivery pump, and the slurry spray gun is communicated with the inlet of the desulfurization tower;
the sodium bicarbonate desulfurization system comprises a sodium bicarbonate powder bin, a second weighing meter and a grinding machine are sequentially connected below the sodium bicarbonate powder bin, and the outlet of the grinding machine is connected with a front inlet pipeline of the SDA desulfurization tower through a spray pipe;
the pneumatic ash conveying system comprises pneumatic ash conveying machines which are respectively arranged below the electric dust collector, the SDA desulfurization tower and the bag type dust collector, and each pneumatic ash conveying machine is respectively connected with the waste bin through an ash conveying pipe;
the flue gas heater is equipped with the heating spray gun including locating the heating chamber of desulfurization fan export in the heating chamber, and the heating spray gun is connected with natural gas line, still is connected with combustion-supporting fan outside the heating chamber, heating chamber exit linkage chimney.
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| CN202022334737.0U CN213790883U (en) | 2020-10-20 | 2020-10-20 | Flue gas de-whitening device based on semi-dry process |
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| CN202022334737.0U CN213790883U (en) | 2020-10-20 | 2020-10-20 | Flue gas de-whitening device based on semi-dry process |
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| CN213790883U true CN213790883U (en) | 2021-07-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115030792A (en) * | 2022-05-10 | 2022-09-09 | 昆明理工大学 | Medium-low temperature flue gas whitening and waste heat ORC power generation and water resource recovery system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115030792A (en) * | 2022-05-10 | 2022-09-09 | 昆明理工大学 | Medium-low temperature flue gas whitening and waste heat ORC power generation and water resource recovery system |
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Address after: 518054 5 / F, east block, beiyihai Plaza, Chuangye Road, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Kaisheng Technology Engineering Co.,Ltd. Patentee after: China Triumph International Engineering Co.,Ltd. Address before: 518054 5 / F, east block, beiyihai Plaza, Chuangye Road, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN TRIUMPH TECHNOLOGY ENGINEERING Co.,Ltd. Patentee before: China Triumph International Engineering Co.,Ltd. |
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