CN209885543U - White smoke plume eliminating system for wet desulphurization - Google Patents
White smoke plume eliminating system for wet desulphurization Download PDFInfo
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- CN209885543U CN209885543U CN201920202368.4U CN201920202368U CN209885543U CN 209885543 U CN209885543 U CN 209885543U CN 201920202368 U CN201920202368 U CN 201920202368U CN 209885543 U CN209885543 U CN 209885543U
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Abstract
The utility model discloses a white plume elimination system of wet flue gas desulfurization, the air intake of draught fan lets in former flue gas, and the air outlet of draught fan is connected with the income wind gap of flue gas cooling heat exchanger, the desulfurizing tower is gone into the wind gap and is connected with the air outlet of flue gas cooling heat exchanger, the income wind gap of flue gas condensation heat exchanger is connected with the air outlet of desulfurizing tower, the income wind gap of flue gas reheating heat exchanger is connected with the air outlet of flue gas condensation heat exchanger. The utility model has the advantages that on traditional GGH basis, combine current ultralow emission requirement, optimize the process route, improve the reliability of device, reduce the maintenance volume.
Description
Technical Field
The utility model belongs to the technical field of the environmental protection, a wet flue gas desulfurization white plume elimination technology is related to, especially relate to a wet flue gas desulfurization white plume elimination system.
Background
Since the atmospheric pollution control is carried out in China, the wet flue gas desulfurization process is always the main SO2And (4) control technology. Flue gas moisture content after wet desulphurizationThe smoke temperature is high (15-18%), the smoke temperature is low (48-55 ℃), and water vapor in the smoke is gradually condensed into fog along with further reduction of the temperature in the discharging process, so that the phenomenon of white smoke emission of a chimney occurs. Meanwhile, the white smoke contains a large amount of liquid drops and substances such as aerosol, gypsum particles and the like, the aerosol and the gypsum particles in the smoke mainly come from fine liquid drops atomized by a spray layer nozzle of a desulfurizing tower, the diameter of the atomized liquid drops of the gypsum slurry is generally 920 mu m after the gypsum slurry is atomized by the nozzle, and a small amount of atomized liquid drops of about 15 mu m can be generated after collision. Therefore, the phenomenon of 'rainfall' often appears near the chimney, and the local climate is affected. Developed countries require the smoke exhaust temperature of a chimney to be higher than 80 ℃, so that 'white smoke' cannot be seen, but China currently has no rigid requirement on the smoke exhaust temperature of the chimney, causes smoke turning around, is easy to cause misunderstanding of surrounding people, and causes unnecessary attention. In addition, the elimination and treatment of white smoke plume in a wet desulphurization system are clearly specified in China, Shanghai, Zhejiang, Tangshan, Handan and the like.
Overall, the prior art suffers from the following drawbacks: the traditional clean flue gas heating method has high energy consumption; the traditional GGH system has the problem of smoke channeling, and pollutants are easy to exceed the standard under the existing ultralow emission standard; the existing smoke plume whitening technology generally has the problems of equipment blockage and corrosion.
SUMMERY OF THE UTILITY MODEL
The white smoke plume elimination system for wet desulphurization is provided for solving the problems in the background art, and the white smoke plume elimination effect of a chimney exhaust port is realized.
The design idea of the utility model is that: when the saturated wet smoke discharged from the chimney contacts with the ambient air with lower temperature, in the process of cooling the smoke, the water vapor contained in the smoke is supersaturated and condensed, and condensed water drops refract and scatter light, so that the smoke plume presents white or gray, which is called as 'wet smoke plume' (commonly called 'big white smoke'). Meanwhile, the big white smoke contains substances such as liquid drops, gypsum particles, aerosol and the like. The utility model provides a pair of white plume elimination system of wet flue gas desulfurization is: the method is characterized in that the temperature of raw flue gas at 120-140 ℃ is reduced to about 80-90 ℃ by a flue gas cooling heat exchanger before wet desulphurization, water of the flue gas cooling heat exchanger is also heated, the desulfurized flue gas from a desulfurizing tower adopts a flue gas reheating heat exchanger at about 40-50 ℃, the water of the flue gas reheating heat exchanger uses the heated water of hot flue gas at the upstream of FGD as a circulating heat source to heat clean flue gas at the downstream, and an economical and applicable heating system is ensured by optimized design. When the original flue gas temperature of the FGD inlet is higher than or equal to the design temperature, the temperature of the clean flue gas outlet is ensured to be higher than or equal to 80 ℃, and all equipment and parts in contact with corrosive media adopt corresponding anticorrosion measures. Meanwhile, factors such as abrasion and corrosion of the heating surface are considered, and the heat storage element adopts a steel pipe coated with enamel and has an easily cleaned surface. When the heat exchange element is replaced, other heat exchange elements cannot be influenced. All the structural parts are thick enough to take the corrosion allowance into consideration, and the surfaces of the elements are easy to clean. In addition, a flue gas condensing heat exchanger is arranged at the outlet of the desulfurizing tower, the temperature of the flue gas is reduced to below 45 ℃ through heat exchange between circulating water and the flue gas, and the water content is less than or equal to 8 percent; in addition, the circulating water is cooled by an air cooling tower, and finally the requirements of relevant countries are met.
The utility model provides a following technical scheme:
the utility model provides a white plume elimination system of wet flue gas desulfurization, includes draught fan, flue gas cooling heat exchanger, desulfurizing tower, flue gas condensation heat exchanger, flue gas reheat heat exchanger, flue and fume extractor, the air intake of draught fan lets in former flue gas, and the air outlet of draught fan is connected with the income wind gap of flue gas cooling heat exchanger, the desulfurizing tower is gone into the wind gap and is connected with the air outlet of flue gas cooling heat exchanger, the income wind gap of flue gas condensation heat exchanger is connected with the air outlet of desulfurizing tower, flue gas reheat heat exchanger's income wind gap is connected with the air outlet of flue gas condensation heat exchanger, flue gas reheat heat exchanger's air outlet and fume extractor intercommunication, the connection between above-mentioned all devices all is. The fume extractor is a chimney.
The flue gas condensing heat exchanger is provided with a cooling water circulation system. The cooling water circulation system comprises a cooling water circulation pipeline, an air cooling tower and a cooling water circulation pump, one part of the cooling water pipeline is positioned in the flue gas condensation heat exchanger, the other part of the cooling water pipeline is positioned outside the flue gas condensation heat exchanger, and the air cooling tower and the cooling water circulation pump are sequentially connected in series on the cooling water circulation pipeline positioned outside the flue gas condensation heat exchanger.
And a heat medium water circulation system is arranged between the flue gas cooling heat exchanger and the flue gas reheating heat exchanger. The heat medium water circulating system comprises a heat medium water circulating pump and a heat medium water circulating pipe; two ends of the heat medium water circulating pipe are respectively positioned in the flue gas cooling heat exchanger and the flue gas reheating heat exchanger, the middle part of the heat medium water circulating pipe is positioned outside, and a heat medium water circulating pump is arranged on the heat medium water circulating pipe positioned outside.
The utility model discloses a theory of operation: the method comprises the following steps that the original flue gas is about 140 ℃ before desulfurization after pressurization of an induced draft fan, the flue gas enters a desulfurization tower about 95 ℃ after heat exchange of heat medium water in a flue gas cooling heat exchanger, the flue gas enters a flue gas condensation heat exchanger after desulfurization of the desulfurization tower, the temperature of the flue gas is reduced under the action of cooling water, water vapor in the flue gas is condensed and collected back to the desulfurization tower, the flue gas enters the flue gas reheating heat exchanger through a flue, the flue gas is heated through the heated heat medium water, and finally the emission temperature of the flue gas is higher than 65 ℃.
After the cooling water is pressurized by the cooling water circulating pump, the cooling water enters the flue gas condensation heat exchanger to cool and condense the desulfurized clean flue gas, the cooling water is heated up simultaneously, and the cooling water after being heated up returns to the air cooling tower and is cooled by natural ventilation to reduce the temperature.
Meanwhile, the heat medium water is pressurized by a heat medium water circulating pump, enters a flue gas cooling heat exchanger, is heated by high-temperature flue gas in the flue gas cooling heat exchanger, enters a flue gas reheating heat exchanger through a heat medium circulating pipe, heats the condensed flue gas, and finally reaches 65 ℃ to achieve the aim of eliminating white smoke plume.
The utility model has the beneficial technical effects that the temperature of the chimney exhaust port is improved, the diffusion of smoke is facilitated, and the phenomenon of white smoke disappears; the 'rain' phenomenon does not exist around the chimney; the original smoke and the clean smoke do not have the smoke mixing phenomenon, and the discharge of the chimney discharge port reaching the standard is ensured; the utility model avoids the blockage problem of the original GGH system; the flue gas condensate water is increased, and the water consumption of the whole plant is saved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a block diagram of a wet desulfurization white plume abatement system;
in the figure, 1, a draught fan; 2. a flue gas cooling heat exchanger; 3. a desulfurizing tower; 4. an air cooling tower; 5. a cooling water circulation pump; 6. a flue gas condensing heat exchanger; 7. a flue gas reheating heat exchanger; 8. a heat medium water circulating pump; 9. a heat medium water circulating pipe; 10. a cooling water circulation pipe; 11. a flue.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.
Please refer to fig. 1, a white smoke plume elimination system for wet desulphurization, which comprises an induced draft fan 1, a flue gas cooling heat exchanger 2, a desulfurizing tower 3, a flue gas condensing heat exchanger 6, a flue gas reheating heat exchanger 7, a flue 11 and a smoke exhaust device, wherein the original flue gas is introduced into an air inlet of the induced draft fan 1, an air outlet of the induced draft fan 2 is connected with an air inlet of the flue gas cooling heat exchanger 2, an air inlet of the desulfurizing tower 3 is connected with an air outlet of the flue gas cooling heat exchanger 2, an air inlet of the flue gas condensing heat exchanger 6 is connected with an air outlet of the desulfurizing tower 3, an air inlet of the flue gas reheating heat exchanger 7 is connected with an air outlet of the flue gas condensing heat exchanger 6, an air outlet of the flue gas reheating heat exchanger 7 is communicated. The fume extractor is a chimney.
And the flue gas condensing heat exchanger 6 is provided with a cooling water circulation system. The cooling water circulation system comprises a cooling water circulation pipeline 10, an air cooling tower 4 and a cooling water circulation pump 5, wherein one part of the cooling water pipeline 10 is positioned in the flue gas condensation heat exchanger 6, the other part of the cooling water pipeline 10 is positioned outside the flue gas condensation heat exchanger 6, and the air cooling tower 4 and the cooling water circulation pump 5 are sequentially connected in series on the cooling water circulation pipeline 10 positioned outside the flue gas condensation heat exchanger 6.
And a heat medium water circulation system is arranged between the flue gas cooling heat exchanger 2 and the flue gas reheating heat exchanger 7. The heat medium water circulating system comprises a heat medium water circulating pump 8 and a heat medium water circulating pipe 9; two ends of the heat medium water circulating pipe 9 are respectively positioned in the flue gas cooling heat exchanger 2 and the flue gas reheating heat exchanger 7, the middle part of the heat medium water circulating pipe 9 is positioned outside, and a heat medium water circulating pump 8 is arranged on the heat medium water circulating pipe 9 positioned outside.
The utility model discloses a theory of operation: the former flue gas is about 140 ℃ before the desulfurization after draught fan 1 pressurization, after the heat transfer of heat medium water in flue gas cooling heat exchanger 2, about 95 ℃, get into desulfurizing tower 3, after the desulfurizing tower desulfurization, get into flue gas condensation heat exchanger 6, under the effect of cooling water, the flue gas temperature reduces, collect back desulfurizing tower 3 after the vapor condensation in the flue gas, the flue gas gets into flue gas reheat heat exchanger 7 through flue 11, heat the flue gas through the heat medium water after the intensification, the final emission temperature of flue gas is higher than 65 ℃.
After the cooling water is pressurized by the cooling water circulating pump 5, the cooling water enters the flue gas condensation heat exchanger 6 to cool and condense the desulfurized clean flue gas, the cooling water is heated up simultaneously, and the cooling water after being heated up returns to the air cooling tower 4 and is cooled by natural ventilation to reduce the temperature.
Meanwhile, the hot medium water is pressurized by a hot medium water circulating pump 8, enters the flue gas cooling heat exchanger 2, is heated by high-temperature flue gas in the flue gas cooling heat exchanger 2, enters the flue gas reheating heat exchanger 7 through a hot medium circulating pipe 9, heats the condensed flue gas, and finally reaches 65 ℃ to achieve the aim of eliminating 'white smoke plume'.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A wet desulphurization white smoke plume elimination system is characterized in that: including draught fan, flue gas cooling heat exchanger, desulfurizing tower, flue gas condensation heat exchanger, flue gas reheat heat exchanger, flue and fume extractor, the air intake of draught fan lets in former flue gas, and the air outlet of draught fan is connected with the income wind gap of flue gas cooling heat exchanger, the desulfurizing tower is gone into the wind gap and is connected with the air outlet of flue gas cooling heat exchanger, the income wind gap of flue gas condensation heat exchanger is connected with the air outlet of desulfurizing tower, the income wind gap of flue gas reheat heat exchanger is connected with the air outlet of flue gas condensation heat exchanger, the air outlet and the fume extractor intercommunication of flue gas reheat heat exchanger, the connection between above-mentioned all devices all is connected through the flue.
2. The wet desulfurization white plume abatement system of claim 1, wherein: the flue gas condensing heat exchanger is provided with a cooling water circulation system.
3. The wet desulfurization white plume abatement system of claim 2, wherein: the cooling water circulation system comprises a cooling water circulation pipeline, an air cooling tower and a cooling water circulation pump, wherein one part of the cooling water circulation pipeline is positioned inside the flue gas condensation heat exchanger, the other part of the cooling water circulation pipeline is positioned outside the flue gas condensation heat exchanger, and the air cooling tower and the cooling water circulation pump are sequentially connected in series on the cooling water circulation pipeline positioned outside the flue gas condensation heat exchanger.
4. The wet desulfurization white plume abatement system of claim 1, wherein: and a heat medium water circulation system is arranged between the flue gas cooling heat exchanger and the flue gas reheating heat exchanger.
5. The wet desulfurization white plume elimination system of claim 4, wherein: the heat medium water circulating system comprises a heat medium water circulating pump and a heat medium water circulating pipe; two ends of the heat medium water circulating pipe are respectively positioned in the flue gas cooling heat exchanger and the flue gas reheating heat exchanger, the middle part of the heat medium water circulating pipe is positioned outside, and a heat medium water circulating pump is arranged on the heat medium water circulating pipe positioned outside.
6. The wet desulfurization white plume abatement system of claim 1, wherein: the fume extractor is a chimney.
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| CN201920202368.4U CN209885543U (en) | 2019-02-15 | 2019-02-15 | White smoke plume eliminating system for wet desulphurization |
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| CN201920202368.4U CN209885543U (en) | 2019-02-15 | 2019-02-15 | White smoke plume eliminating system for wet desulphurization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112944376A (en) * | 2021-02-08 | 2021-06-11 | 陕西陕化煤化工集团有限公司 | Colored smoke plume removing system and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112944376A (en) * | 2021-02-08 | 2021-06-11 | 陕西陕化煤化工集团有限公司 | Colored smoke plume removing system and application |
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