CN210219835U - System for removing white smoke after desulfurization and GGH heating method - Google Patents
System for removing white smoke after desulfurization and GGH heating method Download PDFInfo
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- CN210219835U CN210219835U CN201921012180.XU CN201921012180U CN210219835U CN 210219835 U CN210219835 U CN 210219835U CN 201921012180 U CN201921012180 U CN 201921012180U CN 210219835 U CN210219835 U CN 210219835U
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Abstract
The utility model discloses a desulfurization adds system that flue gas takes off white behind GGH heating method states SCR deNOx systems rethread pipeline intercommunication air heater, and air heater passes through pipeline intercommunication dust remover, and the flue gas in the dust remover is sent into GGH system through draught fan partly and is carried out the heat transfer, is sent into the desulfurizing tower carries out the desulfurization, and the flue gas after the desulfurizing tower desulfurization gets into through wet electric dust remover the GGH system carries out the flue gas temperature rise. In the application, the amount of water vapor generated when the flue gas contacts with the desulfurization solution when entering the tower is also greatly reduced, so that the concentration of liquid mist above a spraying layer can be correspondingly reduced, the volume occupied by the water vapor in the flue gas can also be reduced, the total volume of the flue gas is reduced, and in addition, the total operating temperature in the desulfurization tower can be reduced due to the reduction of the inlet flue gas temperature; in addition, due to the reduction of the temperature of the inlet flue gas, the total operation temperature in the desulfurizing tower is reduced, and the saturated absolute humidity water content contained in the discharged flue gas is reduced.
Description
Technical Field
The utility model relates to an environmental protection technology field especially relates to a system that flue gas takes off white behind desulfurization and GGH heating method.
Background
Most of boiler flue gas is desulfurized and denitrated and then is directly discharged into a chimney from a dust remover, the temperature is usually between 110 ℃ and 160 ℃, and the boiler flue gas is called dry flue gas. After the desulfurizing device is added, the temperature of the flue gas discharged from the chimney is reduced, and the flue gas is changed into saturated wet flue gas. When this type of flue gas contacts with the lower ambient air of temperature, at flue gas cooling in-process, the vapor condensation that contains in the flue gas becomes the liquid, and flue gas luminousness descends, and the water droplet that condenses produces refraction, scattering to demonstrate the chimney and emit white cigarette phenomenon. Along with the further diffusion of the smoke in the atmosphere, the concentration of the liquid drops is reduced, meanwhile, the partial pressure of water vapor is reduced, the saturation temperature is reduced and condensation is not continued, the condensed liquid drops are re-evaporated, the light transmittance is improved, and further, the white smoke is gradually reduced until the white smoke disappears.
At present, white smoke has visual pollution, is usually located in suburbs of cities in industries such as power plants, steel, coking, chemical industry and the like, and is more in peripheral residents, so that negative emotion is caused to life of the people when the people see the smoke all day long. If the smoke emits different colors, the power plant is easy to be complained by surrounding residents. For factories, huge smoke cannot be associated with huge pollution, and smoke plumes seriously affect the images of factories and cities. Otherwise affecting haze formation. More than 90% of power plant boilers are wet desulphurization, saturated wet flue gas with the discharge temperature of 50-60 ℃ and the humidity of 100-200 g/Nm3 (g/standard), while the average humidity of the atmosphere in China is only 9g/Nm3, and the wet desulphurization flue gas humidity of the boilers is more than 10 times of the average humidity of the atmosphere. According to the research, the more humid smoke is difficult to diffuse. Meanwhile, the higher the smoke temperature, the easier the smoke temperature is to diffuse. The temperature and humidity of the discharged flue gas easily cause the haze to be difficult to disperse.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a system that flue gas takes off white behind desulfurization and GGH heating method solves the white cigarette of conventional boiler and causes visual pollution and the problem that lasts that influences haze weather conditions.
In order to solve the technical problem, the utility model adopts the following technical scheme:
the utility model provides a system for removing white smoke after desulfurization and GGH heating method, which comprises an SCR denitration system, an air preheater, a dust remover, a draught fan, a desulfurizing tower, a wet electric dust remover, GGH and a chimney; boiler flue gas passes through pipeline intercommunication SCR deNOx systems, SCR deNOx systems rethread pipeline intercommunication air heater, air heater passes through pipeline intercommunication dust remover, flue gas in the dust remover is sent into the GGH system through draught fan partly and is carried out the heat transfer, and another part is sent into the desulfurizing tower is desulfurized, and flue gas after the desulfurizing tower desulfurization passes through wet electric dust remover and gets into the GGH system carries out the flue gas temperature rise, discharges the chimney at last and discharges.
Furthermore, one part of the flue gas conveyed by the induced draft fan directly enters a desulfurizing tower, and the other part of the flue gas exchanges heat with the GGH and then enters the desulfurizing tower for desulfurization.
And further, the GGH is a flue gas reheater, wherein wet flue gas and dry flue gas exchange heat to raise the temperature of the desulfurized flue gas to be above 80 ℃, and then the flue gas is discharged.
And further, the spray liquid in the desulfurizing tower comes from the slurry tank.
Still further, the spray liquid is limestone solution.
Still further, the water source of the slurry tank is from a water cooling tower and is conveyed through a pipeline and a conveying pump.
Compared with the prior art, the utility model discloses a beneficial technological effect: in the application, the amount of water vapor generated when the flue gas contacts with the desulfurization solution when entering the tower is also greatly reduced, so that the concentration of liquid mist above a spraying layer can be correspondingly reduced, the volume occupied by the water vapor in the flue gas can also be reduced, the total volume of the flue gas is reduced, and in addition, the total operating temperature in the desulfurization tower can be reduced due to the reduction of the inlet flue gas temperature; because the reduction of entry flue gas temperature, then also can greatly reduced with the vapor volume that the doctor produced when the flue gas is gone into the tower when contacting, then can correspondingly reduce the liquid fog concentration that sprays the layer top, also can reduce the volume that vapor occupies in the flue gas, the total volume of flue gas volume reduces, because the reduction of entry flue gas temperature in addition, total operating temperature can all reduce in the desulfurizing tower, then the saturation humidity (absolute humidity) water content that the exhaust flue gas contains reduces.
Drawings
The present invention will be further explained with reference to the following description of the drawings.
FIG. 1 is a process flow diagram of the system for removing white smoke after desulfurization and GGH heating method of the present invention.
Detailed Description
As shown in fig. 1, a system for removing white smoke from flue gas after desulfurization and GGH heating comprises an SCR denitration system, an air preheater, a dust remover, an induced draft fan, a desulfurizing tower, a wet electric dust remover, a GGH and a chimney; boiler flue gas passes through pipeline intercommunication SCR deNOx systems, SCR deNOx systems rethread pipeline intercommunication air heater, air heater passes through pipeline intercommunication dust remover, flue gas in the dust remover is sent into the GGH system through draught fan partly and is carried out the heat transfer, and another part is sent into the desulfurizing tower is desulfurized, and flue gas after the desulfurizing tower desulfurization passes through wet electric dust remover and gets into the GGH system carries out the flue gas temperature rise, discharges the chimney at last and discharges.
The GGH reheater has the advantages that only one group of heat exchangers is needed, low-temperature flue gas at the upper end of the desulfurizing tower is directly subjected to heat exchange through high-temperature flue gas at the lower end of the desulfurizing tower, the low-temperature flue gas is raised to more than 85 ℃, equipment is installed, pipeline connection is relatively simple, investment cost is low, and energy consumption of subsequent operation is avoided because heat is transferred by virtue of phase change of working media in heat pipes of core components of the heat exchangers; the high-low temperature section is obviously divided, the sealing is in place, and the problem of smoke cross-over does not exist
In this embodiment, one part of the flue gas conveyed by the induced draft fan directly enters the desulfurizing tower, the other part of the flue gas exchanges heat with the GGH first and then enters the desulfurizing tower for desulfurization, and one part of the flue gas exchanges heat with the GGH heat exchanger, so that the temperature of the flue gas passing through the desulfurizing tower is increased; the GGH is a flue gas reheater, wherein wet flue gas and dry flue gas exchange heat, the temperature of the desulfurized flue gas is raised to be above 80 ℃, and then the flue gas is discharged. Spraying liquid in the desulfurization tower comes from a slurry tank, the spraying liquid is limestone solution, and the wet limestone method is adopted for desulfurization in the embodiment; the water source of the slurry tank is from a water cooling tower and is conveyed through a pipeline and a conveying pump, wherein the water cooling tower provides a water source for the slurry tank and sprays into the desulfurizing tower, so that a desulfurizing solution is provided for desulfurization on one hand, the smoke temperature is reduced on the other hand, and the reaction time is prolonged.
The principle of the process system is as follows:
since the saturation moisture content of the wet gas is related to the wet flue gas pressure and saturation temperature, the higher the moisture content. The flue gas gauge pressure after wet desulphurization is a micro-positive pressure of several hundred pascals and can be approximately regarded as a constant absolute atmospheric pressure. At constant atmospheric pressure, the saturated moisture content of the wet flue gas is only related to the saturated flue gas temperature, which can be found in many relevant technical manuals and can also be calculated. For the sake of convenience of discussion, the relationship between the saturation moisture content and the saturation temperature is shown in Table 1 based on 1Nm3 of dry flue gas.
Watch 1
The current state points of the wet flue gas after wet desulphurization are as follows: the average temperature was 50 ℃ and the moisture content was 111.8g/Nm 3. Under the condition that the saturation moisture content of wet flue gas is not changed, the temperature of the flue gas is increased to 80 ℃ in a direct heat exchange mode, the relative humidity of the flue gas is reduced from 100% to 16%, and the flue gas becomes dry flue gas to be discharged, and the method belongs to temperature rise dehumidification. At the moment, the smoke is not in a saturated state any more, the moisture content is greatly reduced, the moisture content of the wet smoke is reduced to be below 50g/Nm3 from 111.8g/Nm3, the smoke is closer to the atmospheric moisture content, and the practice proves that the dehumidification and the whitening can be realized, so that the atmospheric haze pollution in China is solved.
Meanwhile, the inlet flue gas of the desulfurizing tower is cooled, the volume of the flue gas is reduced after the temperature of the flue gas is reduced, the ascending flow speed in the original desulfurizing tower is naturally reduced, the contact reaction time with the desulfurizing liquid is prolonged, the desulfurizing efficiency is correspondingly improved, the steam amount generated when the flue gas is contacted with the desulfurizing liquid when entering the desulfurizing tower is also greatly reduced due to the reduction of the temperature of the inlet flue gas, the liquid fog concentration above a spraying layer is correspondingly reduced, the volume occupied by the steam in the flue gas is also reduced, the total volume of the flue gas is reduced, in addition, the total operating temperature in the desulfurizing tower is reduced due to the reduction of the temperature of the inlet flue gas, under the condition that other conditions are not changed, the inlet flue gas is reduced by about 20 ℃, the temperature of the discharged flue gas can be reduced by more than 6 ℃, the temperature of circulating desulfurizing slurry can be reduced by more than 5 ℃, and the saturated humidity (absolute humidity) water content.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used for convenience of description only, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above embodiments are only for describing the preferred mode of the invention, and are not intended to limit the scope of the invention, and various modifications and improvements made to the technical solution of the invention by those skilled in the art without departing from the spirit of the invention should fall within the protection scope defined by the claims of the invention.
Claims (6)
1. A system for removing white smoke after desulfurization and GGH heating method is characterized in that: the system comprises an SCR denitration system, an air preheater, a dust remover, an induced draft fan, a desulfurizing tower, a wet electric dust remover, a GGH and a chimney; boiler flue gas passes through pipeline intercommunication SCR deNOx systems, SCR deNOx systems rethread pipeline intercommunication air heater, air heater passes through pipeline intercommunication dust remover, flue gas in the dust remover is sent into the GGH system through draught fan partly and is carried out the heat transfer, and another part is sent into the desulfurizing tower is desulfurized, and flue gas after the desulfurizing tower desulfurization passes through wet electric dust remover and gets into the GGH system carries out the flue gas temperature rise, discharges the chimney at last and discharges.
2. The system for removing white smoke from flue gas after desulfurization and GGH heating method according to claim 1, wherein: one part of the flue gas conveyed by the induced draft fan directly enters a desulfurizing tower, and the other part of the flue gas exchanges heat with the GGH and then enters the desulfurizing tower for desulfurization.
3. The system for removing white smoke from flue gas after desulfurization and GGH heating method according to claim 2, wherein: the GGH is a flue gas reheater, wherein wet flue gas and dry flue gas exchange heat, the temperature of the desulfurized flue gas is raised to be above 80 ℃, and then the flue gas is discharged.
4. The system for removing white smoke from flue gas after desulfurization and GGH heating method according to claim 1, wherein: and the spray liquid in the desulfurizing tower comes from the slurry tank.
5. The system for smoke de-whitening after desulfurization and GGH temperature rise according to claim 4, wherein: the spraying liquid is limestone solution.
6. The system for smoke de-whitening after desulfurization and GGH temperature rise according to claim 4, wherein: the water source of the slurry tank is from a water cooling tower and is conveyed by a pipeline and a conveying pump.
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| CN201921012180.XU CN210219835U (en) | 2019-07-02 | 2019-07-02 | System for removing white smoke after desulfurization and GGH heating method |
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| CN201921012180.XU CN210219835U (en) | 2019-07-02 | 2019-07-02 | System for removing white smoke after desulfurization and GGH heating method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112844020A (en) * | 2020-12-26 | 2021-05-28 | 河南省大潮炭能科技有限公司 | Flue gas single-alkali desulfurization device for producing super-capacitor carbon and use method thereof |
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2019
- 2019-07-02 CN CN201921012180.XU patent/CN210219835U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112844020A (en) * | 2020-12-26 | 2021-05-28 | 河南省大潮炭能科技有限公司 | Flue gas single-alkali desulfurization device for producing super-capacitor carbon and use method thereof |
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