CN216273195U - System for noncondensable gas is got rid of in desulfurization thick liquid flash distillation - Google Patents
System for noncondensable gas is got rid of in desulfurization thick liquid flash distillation Download PDFInfo
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- CN216273195U CN216273195U CN202122997029.XU CN202122997029U CN216273195U CN 216273195 U CN216273195 U CN 216273195U CN 202122997029 U CN202122997029 U CN 202122997029U CN 216273195 U CN216273195 U CN 216273195U
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- desulfurizing tower
- desulfurization
- tower
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- flue gas
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Abstract
The system for removing the non-condensable gas by the desulfurization slurry flash evaporation comprises a desulfurization tower, a flash tank and a chimney; the desulfurizing tower entry switch-on has hot flue gas, and desulfurizing tower bottom export and flash tank entry linkage, flash tank export and desulfurizing tower top entry linkage, and the top is provided with spray set in the desulfurizing tower, and spray set and desulfurizing tower top entry linkage, the export of desulfurizing tower top is connected with the chimney. The hot flue gas enters a desulfurizing tower, and is subjected to a desulfurization reaction with the desulfurization slurry sprayed from the top in the desulfurizing tower, and simultaneously, the temperature is reduced and the humidity is increased; feeding the desulfurization slurry at the bottom outlet of the desulfurization tower into a flash tank, carrying out an evaporative cooling process on the desulfurization slurry in the flash tank, flashing steam, simultaneously cooling to obtain cold slurry, feeding the cold slurry into the desulfurization tower, and spraying the cold slurry into the tower from the top; the flue gas leaves the desulfurizing tower after spraying and desulfurizing reaction, and is sent into a chimney and discharged into the atmosphere. The effect of eliminating white smoke is achieved, a high-cost smoke heat exchanger is not needed, and the cost is low.
Description
Technical Field
The utility model belongs to the field of power plant flue gas emission, and relates to a system for removing non-condensable gas by desulfurization slurry flash evaporation.
Background
The smoke emission of coal-fired power plants is one of the main sources of domestic atmospheric pollutants, and wet desulfurization towers are widely adopted by domestic coal-fired power plants. The temperature of the flue gas treated by the wet desulphurization device is 45-55 ℃, and the flue gas contains a large amount of water vapor and is in a saturated state. Saturated wet flue gas at the outlet of the desulfurization device is directly discharged from a chimney and then is rapidly cooled when contacting with ambient air with lower temperature, water vapor in the flue gas is supersaturated and condensed, condensed small droplets refract and scatter light, the light transmittance of the flue gas is reduced, and smoke plume at the outlet of the chimney is white or gray in visual effect, so that the smoke plume is called wet smoke plume and is commonly called white smoke.
The existing and common white smoke elimination scheme is a direct heating scheme (MGGH), but the MGGH scheme needs to install two smoke heat exchangers in a flue, occupies the space of the flue, and the tail flue space of the existing thermal power unit is compact, so that the smoke heat exchangers are usually installed in no spare space. Because the flue gas is used as a heat exchange medium in the flue gas heat exchanger, the heat exchange coefficient is low, and a large heat exchange area is needed, the flue gas heat exchanger is usually large, and the cost is high. Because the tail flue needs to be transformed, the MGGH scheme needs the shutdown of the thermal power generating unit, and the normal operation of the unit is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a system for removing non-condensable gas by flash evaporation of desulfurization slurry, which can achieve the effect of eliminating white smoke, does not need a high-cost flue gas heat exchanger and has low cost.
In order to achieve the purpose, the utility model adopts the following technical scheme to realize the purpose:
a system for removing non-condensable gas by desulfurization slurry flash evaporation comprises a desulfurization tower, a flash evaporation tank and a chimney;
the desulfurizing tower entry switch-on has hot flue gas, and desulfurizing tower bottom export and flash tank entry linkage, flash tank export and desulfurizing tower top entry linkage, and the top is provided with spray set in the desulfurizing tower, and spray set and desulfurizing tower top entry linkage, the export of desulfurizing tower top is connected with the chimney.
Preferably, the flash tank is connected with a vacuum pump.
Further, the outlet of the vacuum pump is connected with the inlet of the desulfurizing tower.
And an ejector is connected between the outlet of the vacuum pump and the desulfurizing tower.
Preferably, the inlet of the desulfurizing tower is connected with the outlet of an induced draft fan, and the inlet of the induced draft fan is communicated with hot flue gas.
Preferably, the inlet of the desulfurizing tower is connected with the outlet of a dust remover, and the inlet of the dust remover is communicated with the hot flue gas.
Preferably, a slurry pump is arranged between the outlet at the bottom of the desulfurization tower and the inlet of the flash tank.
Preferably, the inlet of the desulfurizing tower is connected with an air preheater, and the outlet of the air preheater outputs hot flue gas.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model reduces the temperature of the desulfurization slurry in a flash evaporation mode, thereby reducing the temperature of the flue gas, reducing the water content of the flue gas and achieving the effect of eliminating white smoke; the thermal power generating unit does not need to be shut down during transformation, and normal operation of the thermal power generating unit is not affected.
Further, the non-condensable gas pumped out by the vacuum pump contains pollutants such as sulfur dioxide, and the non-condensable gas is injected into the desulfurizing tower in the injector for further desulfurization by taking the compressed air in the power plant as a gas source, so that the emission of the pollutants is reduced.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein: 1-an ejector; 2-a vacuum pump; 3-a dust remover; 4-a draught fan; 5-a desulfurizing tower; 6-a chimney; 7-slurry pump; 8-flash tank.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, the system for removing non-condensable gas by flash evaporation of desulfurized slurry according to the present invention includes an ejector 1, a vacuum pump 2, a dust remover 3, an induced draft fan 4, a desulfurizing tower 5, a chimney 6, a slurry pump 7 and a flash tank 8.
The dust remover 3, the draught fan 4, the desulfurizing tower 5, the slurry pump 7 and the flash tank 8 are connected in sequence, hot flue gas comes from an outlet of the air preheater, and the hot flue gas is communicated with an inlet of the dust remover 3.
5 bottom exports of desulfurizing tower pass through thick liquid pump 7 and flash tank 8 entry linkage, and 8 exports of flash tank and 5 top entry linkages of desulfurizing tower, and the top is provided with spray set in the desulfurizing tower 5, and spray set and 5 top entry linkages of desulfurizing tower, 5 top exports in the desulfurizing tower and is connected with chimney 6.
The flash tank 8 is connected with a vacuum pump 2, an outlet of the vacuum pump 2 is connected with an ejector 1, and an outlet of the ejector 1 is connected with an inlet of a draught fan 4.
The flue gas from the air preheater is dedusted in a deduster 3, then enters a desulfurizing tower 5 through a draught fan 4, and is subjected to a desulfurization reaction with the desulfurization slurry sprayed from the top in the desulfurizing tower 5, and simultaneously is cooled and humidified; the desulfurization slurry at the bottom outlet of the desulfurization tower 5 is sent into a flash tank 8 through a slurry pump 7, the desulfurization slurry in the flash tank 8 is subjected to an evaporative cooling process to flash steam, and is cooled to become cold slurry which is sent into the desulfurization tower 5 and sprayed into the tower from the top; the flue gas leaves the desulfurizing tower 5 after spraying and desulfurization reaction, is sent into a chimney 6 and is discharged into the atmosphere, and the temperature of the desulfurized slurry is reduced in a flash evaporation mode, so that the temperature of the flue gas is reduced, the water content of the flue gas is reduced, and the effect of eliminating white smoke is achieved; the thermal power generating unit does not need to be shut down during transformation, and normal operation of the thermal power generating unit is not affected.
Vacuum pump 2 maintains the vacuum for flash tank 8, because the noncondensable gas that vacuum pump 2 took out contains pollutants such as sulfur dioxide, through compressed air as the air supply in the power plant, incites to draught fan 4 entry with noncondensable gas in ejector 1, carries out further desulfurization entering desulfurizing tower 5, has reduced the emission of pollutant, has improved the protection to the environment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the utility model without departing from the spirit and scope of the utility model, which is to be covered by the claims.
Claims (8)
1. The system for removing the non-condensable gas by the flash evaporation of the desulfurization slurry is characterized by comprising a desulfurization tower (5), a flash evaporation tank (8) and a chimney (6);
the inlet of the desulfurizing tower (5) is communicated with hot flue gas, the outlet of the bottom of the desulfurizing tower (5) is connected with the inlet of a flash tank (8), the outlet of the flash tank (8) is connected with the inlet of the top of the desulfurizing tower (5), a spraying device is arranged at the top of the desulfurizing tower (5), the spraying device is connected with the inlet of the top of the desulfurizing tower (5), and the outlet of the top of the desulfurizing tower (5) is connected with a chimney (6).
2. The system for removing the non-condensable gas by flashing desulfurized slurry according to claim 1, wherein the flash tank (8) is connected with a vacuum pump (2).
3. The system for removing the non-condensable gas by flashing the desulfurized slurry according to claim 2, wherein the outlet of the vacuum pump (2) is connected with the inlet of the desulfurizing tower (5).
4. The system for removing the non-condensable gas by flashing the desulfurized slurry according to claim 3, wherein an ejector (1) is connected between the outlet of the vacuum pump (2) and the desulfurizing tower (5).
5. The system for removing the non-condensable gas through the flash evaporation of the desulfurized slurry according to claim 1, wherein an inlet of the desulfurizing tower (5) is connected with an outlet of an induced draft fan (4), and an inlet of the induced draft fan (4) is communicated with the hot flue gas.
6. The system for removing the non-condensable gas by flashing the desulfurized slurry according to claim 1, wherein the inlet of the desulfurizing tower (5) is connected with the outlet of the dust remover (3), and the inlet of the dust remover (3) is communicated with the hot flue gas.
7. The system for removing the non-condensable gas by flashing desulfurized slurry according to claim 1, wherein a slurry pump (7) is arranged between the outlet at the bottom of the desulfurizing tower (5) and the inlet of the flash tank (8).
8. The system for removing the non-condensable gas by flashing the desulfurized slurry according to claim 1, wherein an air preheater is connected to the inlet of the desulfurizing tower (5), and the outlet of the air preheater outputs hot flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122997029.XU CN216273195U (en) | 2021-11-30 | 2021-11-30 | System for noncondensable gas is got rid of in desulfurization thick liquid flash distillation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122997029.XU CN216273195U (en) | 2021-11-30 | 2021-11-30 | System for noncondensable gas is got rid of in desulfurization thick liquid flash distillation |
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| CN216273195U true CN216273195U (en) | 2022-04-12 |
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| CN202122997029.XU Active CN216273195U (en) | 2021-11-30 | 2021-11-30 | System for noncondensable gas is got rid of in desulfurization thick liquid flash distillation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114031142A (en) * | 2021-11-30 | 2022-02-11 | 华能营口热电有限责任公司 | System for removing non-condensable gas by desulfurization slurry flash evaporation and working method thereof |
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2021
- 2021-11-30 CN CN202122997029.XU patent/CN216273195U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114031142A (en) * | 2021-11-30 | 2022-02-11 | 华能营口热电有限责任公司 | System for removing non-condensable gas by desulfurization slurry flash evaporation and working method thereof |
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