CN113998751A - System for desulfurization slurry flash distillation is carried hot water intaking - Google Patents
System for desulfurization slurry flash distillation is carried hot water intaking Download PDFInfo
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- CN113998751A CN113998751A CN202111447491.0A CN202111447491A CN113998751A CN 113998751 A CN113998751 A CN 113998751A CN 202111447491 A CN202111447491 A CN 202111447491A CN 113998751 A CN113998751 A CN 113998751A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/06—Flash evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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Abstract
The invention relates to the technical field of flue gas treatment, in particular to a system for extracting hot water by desulfurization slurry flash evaporation, which comprises a desulfurization tower, a flash tank, an absorption heat pump, heat source equipment and water treatment equipment, wherein a slurry outlet of the desulfurization tower is connected with a slurry inlet of the flash tank, a steam outlet of the flash tank is connected with a low-temperature heat source inlet of the absorption heat pump, and a high-temperature heat source inlet of the absorption heat pump is connected with an outlet of the heat source equipment; the inlet of the water treatment equipment is connected with the low-temperature heat source outlet of the absorption heat pump, and the outlet of the water treatment equipment is connected with the water replenishing inlet of the absorption heat pump. According to the system for extracting heat and water from the desulfurization slurry through flash evaporation, a large amount of water vapor is extracted from the desulfurization slurry through a flash evaporation mode, and the water vapor is condensed in the absorption heat pump and then mixed with the demineralized water replenishing water of a power plant and then conveyed to a thermodynamic system, so that the recovery and utilization rate of heat energy in the flue gas are improved, and the water consumption of the power plant is reduced.
Description
Technical Field
The invention relates to the field of flue gas treatment technology, in particular to a system for extracting hot water by desulfurization slurry flash evaporation.
Background
The utility boiler, as the first large energy consumption equipment in China, consumes about 15 million tons of standard coal each year, accounting for nearly 50% of the total coal consumption in China. At present, the thermal efficiency of large-scale power station boilers is generally about 90-94%, and the heat loss of exhaust smoke accounts for more than half of the total heat loss, so that huge waste heat resources are stored. And a large amount of moisture contained in the boiler exhaust gas is discharged to the atmosphere.
At present, most coal-fired cogeneration units adopt a plurality of energy-saving measures, and the reduction of smoke discharge loss becomes one part of the units with the largest energy-saving potential after the loss of a cold end is basically eliminated. The waste heat of the flue gas is recycled to reduce the temperature of the discharged flue gas, the loss of the discharged flue gas is reduced, and the energy utilization efficiency of the unit can be effectively improved.
If the waste heat of the boiler flue gas can be deeply utilized, the thermal power generating unit can save a large amount of coal consumption, thereby reducing pollutant emission and saving water, and having great significance to the strategy of energy conservation and emission reduction in China.
Disclosure of Invention
Aiming at the problems of low heat utilization rate and high water consumption of a power plant in the prior art, the invention provides a system for extracting hot water by desulfurization slurry flash evaporation.
The invention is realized by the following technical scheme:
a system for extracting hot water by desulfurization slurry flash evaporation comprises a desulfurization tower, a flash tank, an absorption heat pump, heat source equipment and water treatment equipment, wherein a slurry outlet of the desulfurization tower is connected with a slurry inlet of the flash tank, a steam outlet of the flash tank is connected with a low-temperature heat source inlet of the absorption heat pump, and a high-temperature heat source inlet of the absorption heat pump is connected with an outlet of the heat source equipment; the inlet of the water treatment equipment is connected with the low-temperature heat source outlet of the absorption heat pump, and the outlet of the water treatment equipment is connected with the water replenishing inlet of the absorption heat pump.
Preferably, the heat source equipment comprises a steam turbine and a condenser, a steam exhaust outlet of the steam turbine is connected with a steam inlet of the condenser, a steam extraction outlet of the steam turbine is connected with a high-temperature heat source inlet of the absorption heat pump, and the condenser is connected with the absorption heat pump.
Preferably, a first mixer is further arranged between the condenser and the absorption heat pump, a condensed water inlet of the first mixer is connected with a condensed water outlet of the condenser, and a water supplement outlet of the absorption heat pump is connected with a water supplement inlet of the first mixer.
Preferably, a circulating pump is further arranged between the first mixer and the condenser, a condensed water inlet of the circulating pump is connected with a condensed water outlet of the condenser, and a condensed water outlet of the circulating pump is connected with a condensed water inlet of the first mixer.
Preferably, a control device is arranged between the water treatment device and the absorption heat pump, the control device comprises a water pump and a second mixer which are sequentially arranged, an outlet of the water treatment device is connected with an inlet of the water pump, an outlet of the water pump is connected with an inlet of the second mixer, and an outlet of the second mixer is connected with a water supplementing inlet of the absorption heat pump.
Preferably, a booster pump is arranged between the second mixer and the absorption heat pump, an outlet of the second mixer is connected with an inlet of the booster pump, and an outlet of the booster pump is connected with a water replenishing inlet of the absorption heat pump.
Preferably, the slurry outlet of the flash tank is connected with the slurry spraying inlet of the desulfurization tower.
Preferably, the slurry spraying inlet of the desulfurization tower is positioned at the top end of the desulfurization tower.
Compared with the prior art, the invention has the following beneficial effects:
the system for extracting heat and water from the desulfurization slurry through flash evaporation not only extracts a large amount of water vapor from the desulfurization slurry in a flash evaporation mode, the water vapor is condensed in the absorption heat pump, then is conveyed to a thermodynamic system through water treatment equipment, and is mixed with the steam in the heat source equipment in the absorption heat pump, so that the process of extracting heat and water is realized, the recovery and utilization rate of heat energy in flue gas are improved, and the water consumption of a power plant is reduced.
The system for extracting hot water by desulfurization slurry flash evaporation reduces the temperature of the desulfurization slurry in a flash evaporation mode, thereby reducing the temperature of flue gas, reducing the water content of the flue gas and achieving the effect of eliminating white smoke.
The system for extracting heat and water by desulfurization slurry flash evaporation provided by the invention uses the desulfurization slurry extracted heat as a low-temperature heat source of the absorption heat pump, uses the steam extracted by the steam turbine as a high-temperature heat source, and jointly drives the absorption heat pump for preheating and supplementing water, thereby achieving the effect of reducing the heat loss of exhaust smoke.
The slurry outlet of the flash tank is connected with the slurry spraying inlet of the desulfurizing tower so as to recycle the cold slurry, the slurry in the desulfurizing tower can be cooled, the water balance problem in the desulfurizing tower can be solved, and the possibility of equipment failure caused by the expansion tank of the desulfurizing tower is reduced.
Drawings
FIG. 1 is a schematic diagram of a system for extracting hot water by desulfurization slurry flash evaporation.
In the figure, 1, a steam turbine; 2. a condenser; 3. a circulation pump; 4. a first mixer; 5. a desulfurizing tower; 6. a slurry pump; 7. a flash tank; 8. an absorption heat pump; 9. a water treatment device; 10. a water pump; 11. a second mixer; 12. a booster pump.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
A system for extracting hot water by desulfurization slurry flash evaporation refers to fig. 1, and comprises a desulfurization tower 5, a flash tank 7, an absorption heat pump 8, heat source equipment and water treatment equipment 9, wherein a slurry outlet of the desulfurization tower 5 is connected with a slurry inlet of the flash tank 7 and is controlled by a slurry pump 6. The slurry outlet of the flash tank 7 is connected with the slurry spraying inlet of the desulfurizing tower 5, and the slurry spraying inlet of the desulfurizing tower 5 is positioned at the top of the desulfurizing tower 5.
The heat source equipment comprises a steam turbine 1 and a condenser 2, and a steam outlet of the flash tank 7 is connected with an absorption heat pump 8; an exhaust steam outlet of the steam turbine 1 is connected with a steam inlet of the condenser 2, an exhaust steam outlet of the steam turbine 1 is connected with a high-temperature heat source inlet of the absorption heat pump 8, and the condenser 2 is connected with the absorption heat pump 8; the low-temperature heat source inlet of the absorption heat pump 8 is connected with the steam outlet of the flash tank 7.
Still be equipped with first blender 4 and circulating pump 3 between condenser 2 and the absorption heat pump 8, the condensate inlet of circulating pump 3 and the condensate outlet connection of condenser 2, the condensate outlet of circulating pump 3 and the condensate inlet connection of first blender 4, the condensate inlet of first blender 4 and the condensate outlet connection of condenser 2, the moisturizing export of absorption heat pump 8 and the moisturizing entry linkage of first blender 4.
The inlet of the water treatment device 9 is connected with the low-temperature heat source outlet of the absorption heat pump 8, and the outlet of the water treatment device 9 is connected with the water replenishing inlet of the absorption heat pump 8.
A control device is arranged between the water treatment device 9 and the absorption heat pump 8, the control device comprises a water pump 10 and a second mixer 11 which are arranged in sequence, an outlet of the water treatment device 9 is connected with an inlet of the water pump 10, and an outlet of the water pump 10 is connected with an inlet of the second mixer 11.
A booster pump 12 is arranged between the second mixer 11 and the absorption heat pump 8, the outlet of the second mixer 11 is connected with the inlet of the booster pump 12, and the outlet of the booster pump 12 is connected with the water replenishing inlet of the absorption heat pump 8.
The invention discloses an implementation principle of a system for extracting hot water by desulfurization slurry flash evaporation, which comprises the following steps: the desulfurization slurry enters a flash tank 7 from a desulfurization tower 5 under the action of a slurry pump 6, is subjected to an evaporative cooling process in the flash tank 7, is flashed to generate steam, is cooled to become cold slurry, is sent to the desulfurization tower 5, and is sprayed into the tower from the top.
The steam flashed out from the flash tank 7 is used as a low-temperature heat source of the absorption heat pump, the extracted steam from the steam turbine 1 is used as a high-temperature heat source of the collecting device, heat is released in the collecting device and condensed into water, the collecting device is used for preheating and supplementing water, and the preheated and supplemented water is sent into a thermodynamic system, so that water recovery is realized.
According to the system for extracting heat and water from the desulfurization slurry through flash evaporation, a large amount of water vapor is extracted from the desulfurization slurry through a flash evaporation mode, and the water vapor is condensed in the absorption heat pump and then mixed with the demineralized water replenishing water of a power plant and then conveyed to a thermodynamic system, so that the recovery and utilization rate of heat energy in the flue gas are improved, and the water consumption of the power plant is reduced. The cold slurry in the flash tank 7 is conveyed back to the desulfurizing tower 5, and the slurry in the desulfurizing tower 5 can be cooled, so that the problem of water balance in the desulfurizing tower 5 can be solved, and the equipment failure caused by the expansion tank of the desulfurizing tower 5 is avoided.
Claims (8)
1. The system for extracting hot water by desulfurization slurry flash evaporation is characterized by comprising a desulfurization tower (5), a flash tank (7), an absorption heat pump (8), heat source equipment and water treatment equipment (9), wherein a slurry outlet of the desulfurization tower (5) is connected with a slurry inlet of the flash tank (7), a steam outlet of the flash tank (7) is connected with a low-temperature heat source inlet of the absorption heat pump (8), and a high-temperature heat source inlet of the absorption heat pump (8) is connected with an outlet of the heat source equipment; the inlet of the water treatment equipment (9) is connected with the low-temperature heat source outlet of the absorption heat pump (8), and the outlet of the water treatment equipment (9) is connected with the water supplementing inlet of the absorption heat pump (8).
2. The system for extracting hot water from desulfurization slurry through flash evaporation according to claim 1, wherein the heat source equipment comprises a steam turbine (1) and a condenser (2), a steam exhaust outlet of the steam turbine (1) is connected with a steam inlet of the condenser (2), a steam extraction outlet of the steam turbine (1) is connected with a high-temperature heat source inlet of the absorption heat pump (8), and the condenser (2) is connected with the absorption heat pump (8).
3. The system for extracting hot water from desulfurization slurry through flash evaporation according to claim 2, wherein a first mixer (4) is further arranged between the condenser (2) and the absorption heat pump (8), a condensed water inlet of the first mixer (4) is connected with a condensed water outlet of the condenser (2), and a water replenishing outlet of the absorption heat pump (8) is connected with a water replenishing inlet of the first mixer (4).
4. The system for extracting hot water from desulfurization slurry through flash evaporation according to claim 3, wherein a circulating pump (3) is further arranged between the first mixer (4) and the condenser (2), a condensed water inlet of the circulating pump (3) is connected with a condensed water outlet of the condenser (2), and a condensed water outlet of the circulating pump (3) is connected with a condensed water inlet of the first mixer (4).
5. The system for extracting hot water from desulfurization slurry through flash evaporation is characterized in that a control device is arranged between the water treatment device (9) and the absorption heat pump (8), the control device comprises a water pump (10) and a second mixer (11) which are sequentially arranged, an outlet of the water treatment device (9) is connected with an inlet of the water pump (10), an outlet of the water pump (10) is connected with an inlet of the second mixer (11), and an outlet of the second mixer (11) is connected with a water replenishing inlet of the absorption heat pump (8).
6. The system for extracting hot water from desulfurization slurry through flash evaporation is characterized in that a booster pump (12) is arranged between the second mixer (11) and the absorption heat pump (8), the outlet of the second mixer (11) is connected with the inlet of the booster pump (12), and the outlet of the booster pump (12) is connected with the water replenishing inlet of the absorption heat pump (8).
7. The system for carrying out flash evaporation on desulfurized slurry to extract hot water according to claim 1, characterized in that the slurry outlet of said flash tank (7) is connected to the slurry spray inlet of the desulfurization tower (5).
8. The system for flash evaporation of desulfurized slurry to extract hot water according to claim 7, wherein the slurry spray inlet of said desulfurization tower (5) is located at the top end of the desulfurization tower (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111447491.0A CN113998751A (en) | 2021-11-30 | 2021-11-30 | System for desulfurization slurry flash distillation is carried hot water intaking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111447491.0A CN113998751A (en) | 2021-11-30 | 2021-11-30 | System for desulfurization slurry flash distillation is carried hot water intaking |
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| CN113998751A true CN113998751A (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111447491.0A Pending CN113998751A (en) | 2021-11-30 | 2021-11-30 | System for desulfurization slurry flash distillation is carried hot water intaking |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114797387A (en) * | 2022-05-31 | 2022-07-29 | 华能营口热电有限责任公司 | Flue gas deep carbon capture device and method for recovering waste heat |
| CN114988512A (en) * | 2022-05-31 | 2022-09-02 | 华能营口热电有限责任公司 | Geothermal energy driven desulfurization slurry flash evaporation heat supply system and method |
-
2021
- 2021-11-30 CN CN202111447491.0A patent/CN113998751A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114797387A (en) * | 2022-05-31 | 2022-07-29 | 华能营口热电有限责任公司 | Flue gas deep carbon capture device and method for recovering waste heat |
| CN114988512A (en) * | 2022-05-31 | 2022-09-02 | 华能营口热电有限责任公司 | Geothermal energy driven desulfurization slurry flash evaporation heat supply system and method |
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