CN216281485U - Desulfurization slurry flash evaporation heat-raising air preheating system - Google Patents
Desulfurization slurry flash evaporation heat-raising air preheating system Download PDFInfo
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- CN216281485U CN216281485U CN202122993269.2U CN202122993269U CN216281485U CN 216281485 U CN216281485 U CN 216281485U CN 202122993269 U CN202122993269 U CN 202122993269U CN 216281485 U CN216281485 U CN 216281485U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model discloses a desulfurization slurry flash evaporation heat-raising air preheating system, wherein air preheatingThe smoke inlet of the heater is communicated with the smoke outlet of the economizer, the smoke outlet of the air preheater is communicated with the smoke inlet of the smoke heat exchanger, the smoke outlet of the smoke heat exchanger is communicated with the smoke inlet of the desulfurizing tower, and the water outlet of the smoke heat exchanger is communicated with the water inlet of the absorption heat pump; the desulfurization slurry outlet of the desulfurization tower is communicated with the desulfurization slurry inlet of the flash tank, the steam outlet of the flash tank is communicated with the steam inlet of the absorption heat pump, the air outlet of the absorption heat pump is communicated with the air inlet of the air preheater, and the air outlet of the air preheater is communicated with the air inlet of the boiler. The utility model takes the flue gas at the outlet of the economizer as a high-temperature heat source, and takes the water vapor flashed from the desulfurization slurry as a low-temperature heat source to jointly drive the absorption heat pump to heat the air entering the air heat exchanger, thereby reducing the heat exchange of the air preheater
Loss, energy conservation and consumption reduction are realized.
Description
Technical Field
The utility model belongs to the technical field of waste heat utilization of coal-fired power plants, and particularly belongs to a desulfurization slurry flash evaporation heat-extraction air preheating system.
Background
At present, most coal-fired cogeneration units adopt a plurality of energy-saving measures, the waste heat of flue gas is recovered to reduce the temperature of exhaust smoke, the loss of exhaust smoke is reduced, and the energy utilization efficiency of the units can be effectively improved. At present, the air entering the boiler is preheated by frequently using flue gas, the air preheater is generally used when the air is preheated, but the temperature difference between the inlet air of the air preheater and the flue gas is larger because the inlet air of the air preheater is ambient temperature, so that the heat exchange of the air preheater is larger easily
Loss, and therefore, the need to increase the temperature of the air entering the air preheater to reduce air preheater heat transfer
Loss and the purpose of energy conservation and consumption reduction are realized.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model provides a desulfurization slurry flash evaporation heat-raising air preheating system, which utilizes an absorption heat pump to raise the temperature of air entering an air preheater and reduce the heat exchange of the air preheater
Loss and the purpose of energy conservation and consumption reduction are realized.
In order to achieve the purpose, the utility model provides the following technical scheme: a desulfurization slurry flash evaporation heat-extraction air preheating system comprises an air preheater, a flue gas heat exchanger, a desulfurization tower, a flash evaporation tank and an absorption heat pump, wherein,
the smoke inlet of the air preheater is communicated with the smoke outlet of the economizer, the smoke outlet of the air preheater is communicated with the smoke inlet of the flue gas heat exchanger for heating medium water, the smoke outlet of the flue gas heat exchanger is communicated with the smoke inlet of the desulfurizing tower, and the water outlet of the flue gas heat exchanger is communicated with the water inlet of the absorption heat pump for providing a high-temperature heat source for the absorption heat pump; the desulfurization slurry outlet of the desulfurization tower is communicated with the desulfurization slurry inlet of the flash tank, the steam outlet of the flash tank is communicated with the steam inlet of the absorption heat pump to provide a low-temperature heat source for the absorption heat pump, the air outlet of the absorption heat pump is communicated with the air inlet of the air preheater, and the air outlet of the air preheater is communicated with the air inlet of the boiler.
Furthermore, a dust remover is arranged between the flue gas heat exchanger and the desulfurizing tower, a smoke inlet of the dust remover is communicated with a smoke inlet of the flue gas heat exchanger, and a smoke outlet of the dust remover is communicated with a smoke inlet of the desulfurizing tower.
Further, an induced draft fan is arranged between the flue gas heat exchanger and the desulfurizing tower, and the induced draft fan is used for introducing flue gas in the flue gas heat exchanger into the desulfurizing tower.
Further, a flue gas outlet of the desulfurizing tower is communicated with a chimney.
Further, a cold slurry outlet of the flash tank is communicated with a cold slurry inlet of the desulfurizing tower, and the cold slurry inlet of the desulfurizing tower is arranged at the top of the desulfurizing tower.
Further, a slurry pump is arranged between the desulfurization tower and the flash tank, and the slurry pump is used for sending the desulfurization slurry in the desulfurization tower into the flash tank.
Furthermore, a water outlet of the absorption heat pump is communicated with a water inlet of the flue gas heat exchanger, and the absorption heat pump is used for realizing circulation of a high-temperature heat source.
The utility model also provides a method for preheating air by flash evaporation and heat extraction of the desulfurization slurry, wherein flue gas discharged by the economizer passes through an air preheater and then enters a flue gas heat exchanger to heat intermediate water, and the heated intermediate water is introduced into an absorption heat pump as a high-temperature heat source;
introducing the flue gas subjected to heat exchange in a flue gas heat exchanger into a desulfurizing tower through an induced draft fan, carrying out desulfurization reaction on the flue gas and the desulfurization slurry in the desulfurizing tower, feeding the reacted desulfurization slurry into a flash tank, carrying out flash evaporation on the desulfurization slurry in the flash tank to obtain steam and cold slurry, and introducing the steam which is flash evaporated into an absorption heat pump as a low-temperature heat source;
the absorption heat pump is used for preheating outside air, the preheated air enters the air preheater, the flue gas discharged by the economizer carries out secondary temperature rise on the air in the air preheater, and the air after the secondary temperature rise is sent into the boiler.
Further, the cold slurry after flash evaporation by the flash tank is sent into the desulfurizing tower again to desulfurize the flue gas.
Further, the flue gas after desulfurization in the desulfurization tower is sent into a chimney for discharging the flue gas after desulfurization into the atmosphere.
Compared with the prior art, the utility model has at least the following beneficial effects:
the utility model provides a desulfurization slurry flash evaporation heat-lifting air preheating system, which heats intermediate water in a flue gas heat exchanger by using flue gas at the outlet of an economizer, the heated intermediate water is used as a high-temperature heat source of an absorption heat pump, the flue gas after heat exchange from the flue gas heat exchanger is subjected to wet desulfurization in a desulfurization tower, the obtained desulfurization slurry is flashed in a flash evaporation tank to obtain vapor, the vapor is introduced into the absorption heat pump to be used as a low-temperature heat source of the absorption heat pump, the absorption heat pump is driven by the high-temperature heat source and the low-temperature heat source together, the temperature of the air to be introduced into an air preheater is improved by the absorption heat pump, and the temperature of the air to be introduced into the air preheater is reduced, so that the heat exchange of the air preheater is reduced
Loss, also reduced the heat loss of discharging fume, realized energy saving and consumption reduction.
The utility model provides a desulfurization slurry flash evaporation heat-raising air preheating system, which utilizes flue gas of an economizer to heat medium water in a flue gas heat exchanger, and the heated medium water is introduced into an absorption heat pump to be used as a high-temperature heat source, so that flue gas waste heat can be effectively recovered, and the energy utilization efficiency is improved.
The utility model provides a desulfurization slurry flash evaporation heat-raising air preheating system, which removes a large amount of water vapor of desulfurization slurry through flash evaporation, solves the problem of water balance in a desulfurization tower and avoids equipment failure caused by pool expansion of the desulfurization tower.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The utility model is further described with reference to the following figures and detailed description.
As shown in figure 1, the utility model provides a desulfurization slurry flash evaporation heat-extraction air preheating system, which comprises an air preheater 1, a flue gas heat exchanger 2, a dust remover 3, an induced draft fan 4, a desulfurization tower 5, a chimney 6, a slurry pump 7, a flash evaporation tank 8 and an absorption heat pump 9, wherein,
the smoke inlet of the air preheater 1 is communicated with the smoke outlet of the economizer, the smoke outlet of the air preheater 1 is communicated with the smoke inlet of the smoke heat exchanger 2, and the smoke heat exchanger 2 is used for heating intermediate water;
the smoke outlet of the smoke heat exchanger 2 is communicated with the smoke inlet of the dust remover 3, the smoke outlet of the dust remover 3 is communicated with the inlet of the induced draft fan 4, and the outlet of the induced draft fan 4 is communicated with the smoke inlet of the desulfurizing tower 5;
the water outlet of the flue gas heat exchanger 2 is communicated with the water inlet of the absorption heat pump 9 to provide a high-temperature heat source for the absorption heat pump 9, and the water outlet of the absorption heat pump 9 is communicated with the water inlet of the flue gas heat exchanger 2 to realize circulation of intermediate water.
The smoke outlet of the desulfurizing tower 5 is communicated with the chimney 6, the desulfurizing slurry outlet of the desulfurizing tower 5 is communicated with the inlet of the slurry pump 7, the outlet of the slurry pump 7 is communicated with the desulfurizing slurry inlet of the steam tank 8, the steam outlet of the steam tank 8 is communicated with the steam inlet of the absorption heat pump 9 to provide a low-temperature heat source for the absorption heat pump 9, the air outlet of the absorption heat pump 9 is communicated with the air inlet of the air preheater 1, and the air outlet of the air preheater 1 is communicated with the air inlet of the boiler.
The utility model provides a method for preheating air by flash evaporation and heat extraction of desulfurized slurry, which comprises the following steps:
the flue gas from the economizer preheats the air in the air preheater 1, the preheated air is introduced into the boiler, the flue gas after heat exchange enters the flue gas heat exchanger 2 to heat the intermediary water, and the heated intermediary water is used as a high-temperature heat source of the absorption heat pump 9.
The flue gas from the flue gas heat exchanger 2 is dedusted in a deduster 3, then enters a desulfurizing tower 5 through an induced draft fan 4, and is subjected to 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 fed 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, the steam flashed out by the flash tank 8 is introduced into an absorption heat pump 9 to be used as a low-temperature heat source of the absorption heat pump 9, and heat is recovered in the absorption heat pump 9 and condensed into water;
cooling the desulfurized slurry into cold slurry, sending the cold slurry into the desulfurizing tower 5 again from the flash tank 8, and spraying the cold slurry into the tower from the top of the desulfurizing tower 5; the flue gas leaves the desulfurizing tower 5 after spraying and desulfurizing reaction, and is sent into a chimney 6 and discharged into the atmosphere.
The absorption heat pump 9 is used for preheating air from the environment, and the preheated air enters the air preheater 1 for further heating and then is sent to the boiler.
Claims (8)
1. A desulfurization slurry flash evaporation heat-extraction air preheating system is characterized by comprising an air preheater (1), a flue gas heat exchanger (2), a desulfurization tower (5), a flash tank (8) and an absorption heat pump (9),
the smoke inlet of the air preheater (1) is communicated with the smoke outlet of the economizer, the smoke outlet of the air preheater (1) is communicated with the smoke inlet of the flue gas heat exchanger (2) for heating medium water, the smoke outlet of the flue gas heat exchanger (2) is communicated with the smoke inlet of the desulfurizing tower (5), and the water outlet of the flue gas heat exchanger (2) is communicated with the water inlet of the absorption heat pump (9) for providing a high-temperature heat source for the absorption heat pump (9); the desulfurization slurry outlet of the desulfurization tower (5) is communicated with the desulfurization slurry inlet of the flash tank (8), the steam outlet of the flash tank (8) is communicated with the steam inlet of the absorption heat pump (9) to provide a low-temperature heat source for the absorption heat pump (9), the air outlet of the absorption heat pump (9) is communicated with the air inlet of the air preheater (1), and the air outlet of the air preheater (1) is communicated with the air inlet of the boiler.
2. The desulfurization slurry flash evaporation heat-extraction preheating air system as claimed in claim 1, wherein a dust remover (3) is arranged between the flue gas heat exchanger (2) and the desulfurization tower (5), a smoke inlet of the dust remover (3) is communicated with a smoke inlet of the flue gas heat exchanger (2), and a smoke outlet of the dust remover (3) is communicated with a smoke inlet of the desulfurization tower (5).
3. The system for flash evaporation, heat extraction and air preheating of desulfurized slurry according to claim 1, wherein an induced draft fan (4) is arranged between the flue gas heat exchanger (2) and the desulfurizing tower (5), and the induced draft fan (4) is used for introducing flue gas in the flue gas heat exchanger (2) into the desulfurizing tower (5).
4. A desulfurized slurry flash evaporation heat-raising preheated air system according to claim 1, wherein the flue gas outlet of said desulfurization tower (5) is communicated with a chimney (6).
5. A desulphurized slurry flash evaporation heat-raising preheated air system according to claim 1, wherein the cold slurry outlet of the flash tank (8) is communicated with the cold slurry inlet of the desulphurizing tower (5).
6. A desulfurized slurry flash vaporization heat-raising preheated air system according to claim 1, characterized in that the cold slurry inlet of said desulfurization tower (5) is arranged at the top of said desulfurization tower (5).
7. A desulfurization slurry flash heat-extraction preheated air system according to claim 1, characterized in that a slurry pump (7) is arranged between the desulfurization tower (5) and the flash tank (8), and the slurry pump (7) is used for feeding desulfurization slurry in the desulfurization tower (5) into the flash tank (8).
8. The desulfurization slurry flash evaporation heat-extraction air preheating system as claimed in claim 1, wherein a water outlet of the absorption heat pump (9) is communicated with a water inlet of the flue gas heat exchanger (2) for realizing circulation of a high-temperature heat source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122993269.2U CN216281485U (en) | 2021-11-30 | 2021-11-30 | Desulfurization slurry flash evaporation heat-raising air preheating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122993269.2U CN216281485U (en) | 2021-11-30 | 2021-11-30 | Desulfurization slurry flash evaporation heat-raising air preheating system |
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| CN216281485U true CN216281485U (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122993269.2U Active CN216281485U (en) | 2021-11-30 | 2021-11-30 | Desulfurization slurry flash evaporation heat-raising air preheating system |
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| CN (1) | CN216281485U (en) |
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2021
- 2021-11-30 CN CN202122993269.2U patent/CN216281485U/en active Active
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