CN114001486A - Flash evaporation hot water extraction system based on open absorption heat pump - Google Patents
Flash evaporation hot water extraction system based on open absorption heat pump Download PDFInfo
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- CN114001486A CN114001486A CN202111447577.3A CN202111447577A CN114001486A CN 114001486 A CN114001486 A CN 114001486A CN 202111447577 A CN202111447577 A CN 202111447577A CN 114001486 A CN114001486 A CN 114001486A
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- absorption heat
- heat pump
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- hot water
- open absorption
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B35/00—Boiler-absorbers, i.e. boilers usable for absorption or adsorption
- F25B35/02—Boiler-absorbers, i.e. boilers usable for absorption or adsorption using a liquid as sorbent, e.g. brine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of flue gas treatment, in particular to a flash evaporation hot water extraction system based on an open absorption heat pump. The system for extracting hot water by flash evaporation based on the open absorption heat pump takes the slurry as a heat exchange medium, has a high heat exchange coefficient, replaces a high-cost flue gas heat exchanger, and lowers the temperature of the desulfurized slurry by flash evaporation, thereby reducing the temperature of the flue gas, reducing the water content of the flue gas, reducing the cost of removing water from the flue gas and achieving the effect of eliminating white smoke.
Description
Technical Field
The invention relates to the field of flue gas treatment technology, in particular to a flash evaporation hot water extraction system based on an open absorption heat pump.
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 smoke plume elimination is that the emission temperature and the moisture content of the smoke are reduced by adopting a corresponding technology, the moisture in supersaturated water vapor in the smoke is collected, and the emission of condensable particles such as soluble salt, sulfuric acid mist, organic matters and the like in the smoke is reduced.
The currently more common solution is the direct heating solution (MGGH), which is collectively called MGGH by flue gas heater (tubular, installed behind the wet desulfurization device) + flue gas cooler (tubular, installed before the dry electric dust collector). The flue gas at the outlet of the air preheater is cooled from 118 ℃ to about 90 ℃ through the flue gas cooler and enters the electrostatic dust collector, the flue gas at the desulfurization outlet is heated from 50 ℃ to 75 ℃ and enters the chimney for emission, the environmental temperature can be increased to 15 ℃ or above, and the phenomenon of white smoke is avoided.
The MGGH scheme needs to install two flue gas heat exchangers in a flue, occupies flue space, and needs a thermal power generating unit to stop when being transformed, so that normal operation of the unit is influenced. And the flue gas heat exchanger uses the flue gas as a heat exchange medium, and has lower heat exchange coefficient and larger heat exchange area, so the flue gas heat exchanger is usually larger and has higher cost.
Disclosure of Invention
The invention provides a flash evaporation hot water extraction system based on an open absorption heat pump, aiming at the problems of small heat exchange coefficient of a flue gas heat exchanger and more moisture in flue gas in the prior art.
The invention is realized by the following technical scheme:
a flash evaporation hot water extraction system based on an open absorption heat pump comprises a flash evaporation system, a cooling mechanism and the open absorption heat pump, wherein the flash evaporation system comprises a tower body, a slurry distribution mechanism and vacuum equipment positioned outside the tower body, the slurry distribution mechanism is arranged at the bottom of the tower body, and the vacuum equipment is communicated with the interior of the tower body;
the cooling mechanism comprises a generator, a liquid distribution tube bundle, a lithium bromide solution outlet pump and a lithium bromide solution nozzle, one end of the liquid distribution tube bundle is connected with the generator, the other end of the liquid distribution tube bundle extends into the upper part of the interior of the tower body and is connected with the lithium bromide solution nozzle, and the lithium bromide solution outlet pump is arranged on the liquid distribution tube bundle and is positioned on the outer side of the tower body;
the open absorption heat pump comprises a condenser and water treatment equipment, wherein a steam outlet of the generator is connected with the condenser, a water outlet of the condenser is connected with a water inlet of the water treatment equipment, and a water outlet of the water treatment equipment is connected with a water replenishing port of the condenser.
Preferably, a mixer is further arranged between the water treatment equipment and the condenser.
Preferably, a water pump is arranged between the water treatment equipment and the mixer.
Preferably, a pressure pump is arranged between the mixer and the condenser.
Preferably, the tower body comprises a first cavity and a second cavity which are communicated with each other and arranged in an inverted U shape; the slurry distribution mechanism is positioned at the bottom of the first cavity, and the lithium bromide solution nozzle is positioned at the top of the second cavity.
Preferably, the outlet of the second cavity is communicated with the generator through a lithium bromide solution outlet pump.
Preferably, the slurry distribution device further comprises a first demister, wherein the first demister is arranged in the first cavity and is positioned above the slurry distribution pipe bundle.
Preferably, the device further comprises a second demister, wherein the second demister is vertically positioned at the communication position of the first cavity and the second cavity.
Compared with the prior art, the invention has the following beneficial effects:
the system for extracting hot water by flash evaporation based on the open absorption heat pump absorbs latent heat-carrying water vapor extracted from flue gas by the lithium bromide concentrated solution, and the water vapor is delivered to heat supply backwater through the open absorption heat pump, so that the effects of heat recovery and water saving are achieved. Heat is extracted from the desulfurization slurry in a flash evaporation mode to serve as a low-temperature heat source of the absorption heat pump, steam extracted by a steam turbine serves as a high-temperature heat source, the open absorption heat pump is driven together for preheating and supplementing water, and the effect of reducing smoke exhaust heat loss is achieved.
The water vapor is condensed in the absorption heat pump and then is mixed with the demineralized water replenishing water of the power plant and then is conveyed to the thermodynamic system, so that the water consumption of the power plant is reduced.
Drawings
FIG. 1 is a schematic diagram of a flash evaporation hot water extraction system based on an open absorption heat pump according to the present invention;
in the figure, 1, a tower body; 2. a first demister; 3. a lithium bromide solution inlet pump; 4. a slurry distributing pipe bundle; 5. a slurry nozzle; 6. a slurry pump; 7. liquid distribution tube bundle; 8. a vacuum pump; 9. a lithium bromide solution outlet pump; 10. a lithium bromide solution nozzle; 11. a partition plate; 12. a cold slurry pump; 13. a generator; 14. a second demister; 15. a condenser; 16. a water treatment device; 17. a water pump; 18. a mixer; 19. 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 flash evaporation based on an open absorption heat pump, referring to fig. 1, comprises a flash evaporation system, a cooling mechanism and an open absorption heat pump, wherein the flash evaporation system comprises a tower body 1, a slurry distribution mechanism and vacuum equipment positioned at the outer side of the tower body 1, the tower body 1 comprises a first cavity and a second cavity which are communicated, and the first cavity and the second cavity are arranged in an inverted U shape; the slurry distribution mechanism is positioned at the bottom of the first cavity and comprises a slurry distribution pipe bundle 4, a slurry nozzle 5 and a slurry pump 6, the slurry pipe bundle is connected with the slurry nozzle 5, one end of the slurry pipe bundle extends out of the first cavity and is connected with the slurry pump 6. The vacuum device is communicated with the second cavity, and the vacuum device is a vacuum pump 8 in the embodiment. The vacuum pump 8 is further provided with a partition plate 11 at the communication position of the second cavity, and the partition plate 11 can reduce liquid drops in the second cavity from entering the vacuum pump 8.
The first cavity bottom is equipped with the export, and the exit is equipped with cold thick liquid pump 12, and cold thick liquid can get back to the desulfurizing tower after cold thick liquid pump 12 steps up, can carry out the moisturizing operation to the desulfurizing tower.
The cooling mechanism comprises a generator 13, a liquid distribution tube bundle 7, a lithium bromide solution outlet pump 9 and a lithium bromide solution nozzle 10, one end of the liquid distribution tube bundle 7 is connected with the generator 13, the other end of the liquid distribution tube bundle extends into the upper part inside the second cavity and is connected with the lithium bromide solution nozzle 10, and the lithium bromide solution outlet pump 9 is arranged on the liquid distribution tube bundle 7 and is positioned outside the tower body 1.
Still be provided with first defroster 2 in the first cavity, first defroster 2 is located 4 tops of cloth thick liquid tube bank, and first defroster 2 can play the effect of elementary cooling. The second demister 14 is vertically arranged at the communication position of the first cavity and the second cavity, the second demister 14 can not only cool down again, but also reduce liquid drops sprayed by the lithium bromide solution nozzle 10 from entering the first cavity.
The open absorption heat pump comprises a condenser 15 and a water treatment device 16, wherein the outlet of the second cavity is communicated with a generator 13 through a lithium bromide solution outlet pump 9, the steam outlet of the generator 13 is connected with the condenser 15, the water outlet of the condenser 15 is connected with the water inlet of the water treatment device 16, and the water outlet of the water treatment device 16 is connected with the water replenishing port of the condenser 15.
A mixer 18 is also arranged between the water treatment device 16 and the condenser 15, a water pump 17 is arranged between the water treatment device 16 and the mixer 18, and a pressure pump 19 is arranged between the mixer 18 and the condenser 15.
The invention relates to a flash evaporation hot water extraction system based on an open absorption heat pump, which has the implementation principle that: the desulfurization thick liquid that comes from the desulfurizing tower gets into cloth thick liquid tube bank 4, steps up the back through thick liquid pump 6, sprays through thick liquid nozzle 5 and breaks into the dribble, because the inner chamber of tower body 1 is the negative pressure environment, and the flash distillation takes place for the thick liquid drop, and the vapor that the flash distillation goes out gets into the second cavity after the defogging of first defroster 2. The cooled cold slurry is collected in the first cavity, and then is pressurized by the cold slurry pump 12 and then returns to the desulfurization tower.
The steam turbine extracts steam and is arranged in the dilute lithium bromide solution in the heating generator 13, the concentrated lithium bromide solution from the generator 13 enters the liquid distribution tube bundle 7, after the pressure is increased through the lithium bromide solution inlet pump 3, the concentrated lithium bromide solution is sprayed and crushed into small liquid drops through the lithium bromide solution nozzle 10, the water vapor flashed out is cooled and condensed, and after the water vapor is mixed with the small liquid drops, the water vapor is gathered at the lower part of the second cavity and enters the generator 13 after being increased in pressure through the lithium bromide solution outlet pump 9.
The steam that generator 13 came out gets into condenser 15 and is used for heating the moisturizing of power plant, and the comdenstion water gets into water treatment facilities 16 and carries out behind the water treatment through water pump 17 pressure boost, then gets into blender 18 and moisturizing and mixes, sends into condenser 15 through force (forcing) pump 19 after mixing and heats, and the moisturizing after the heating gets into the moisturizing point.
The system for extracting hot water by flash evaporation based on the open absorption heat pump absorbs latent heat-carrying water vapor extracted from flue gas by the lithium bromide concentrated solution, and the water vapor is delivered to heat supply backwater through the open absorption heat pump, so that the effects of heat recovery and water saving are achieved. Heat is extracted from the desulfurization slurry in a flash evaporation mode to serve as a low-temperature heat source of the absorption heat pump, steam extracted by a steam turbine serves as a high-temperature heat source, the open absorption heat pump is driven together for preheating and supplementing water, and the effect of reducing smoke exhaust heat loss is achieved.
Claims (8)
1. A system for extracting hot water by flash evaporation based on an open absorption heat pump is characterized by comprising a flash evaporation system, a cooling mechanism and the open absorption heat pump, wherein the flash evaporation system comprises a tower body (1), a slurry distribution mechanism and vacuum equipment positioned at the outer side of the tower body (1), the slurry distribution mechanism is arranged at the bottom of the tower body (1), and the vacuum equipment is communicated with the interior of the tower body (1);
the cooling mechanism comprises a generator (13), a liquid distribution tube bundle (7), a lithium bromide solution outlet pump (9) and a lithium bromide solution nozzle (10), one end of the liquid distribution tube bundle (7) is connected with the generator (13), the other end of the liquid distribution tube bundle extends into the upper part of the interior of the tower body (1) and is connected with the lithium bromide solution nozzle (10), and the lithium bromide solution outlet pump (9) is arranged on the liquid distribution tube bundle (7) and is positioned on the outer side of the tower body (1);
the open absorption heat pump comprises a condenser (15) and water treatment equipment (16), wherein a steam outlet of the generator (13) is connected with the condenser (15), a water outlet of the condenser (15) is connected with a water inlet of the water treatment equipment (16), and a water outlet of the water treatment equipment (16) is connected with a water replenishing port of the condenser (15).
2. A flash extraction hot water system based on an open absorption heat pump according to claim 1, wherein a mixer (18) is further provided between the water treatment plant (16) and the condenser (15).
3. A flash extraction hot water system based on an open absorption heat pump according to claim 2, characterized in that a water pump (17) is provided between the water treatment plant (16) and the mixer (18).
4. A flash extraction hot water system based on an open absorption heat pump according to claim 2, characterized in that a booster pump (19) is provided between the mixer (18) and the condenser (15).
5. The open absorption heat pump-based flash evaporation hot water extraction system according to claim 1, wherein the tower body (1) comprises a first cavity and a second cavity which are communicated with each other and arranged in an inverted U shape; the slurry distribution mechanism is positioned at the bottom of the first cavity, and the lithium bromide solution nozzle (10) is positioned at the top of the second cavity.
6. A flash extraction hot water system based on an open absorption heat pump according to claim 5, wherein the outlet of the second cavity is in communication with a generator (13) through a lithium bromide solution outlet pump (9).
7. A flash evaporation hot water extraction system based on an open absorption heat pump according to claim 5, further comprising a first demister (2), wherein the first demister (2) is arranged in the first cavity, and the first demister (2) is located above the slurry distribution pipe bundle (4).
8. A flash extraction hot water system based on an open absorption heat pump according to claim 5, further comprising a second demister (14), the second demister (14) being vertically located at the communication of the first cavity and the second cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111447577.3A CN114001486A (en) | 2021-11-30 | 2021-11-30 | Flash evaporation hot water extraction system based on open absorption heat pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111447577.3A CN114001486A (en) | 2021-11-30 | 2021-11-30 | Flash evaporation hot water extraction system based on open absorption heat pump |
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| Publication Number | Publication Date |
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| CN114001486A true CN114001486A (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111447577.3A Pending CN114001486A (en) | 2021-11-30 | 2021-11-30 | Flash evaporation hot water extraction system based on open absorption heat pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023097895A1 (en) * | 2021-11-30 | 2023-06-08 | 中国华能集团清洁能源技术研究院有限公司 | Open-loop heat pump based grading heat taking and water taking system and method using desulfurization slurry flash evaporation |
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2021
- 2021-11-30 CN CN202111447577.3A patent/CN114001486A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023097895A1 (en) * | 2021-11-30 | 2023-06-08 | 中国华能集团清洁能源技术研究院有限公司 | Open-loop heat pump based grading heat taking and water taking system and method using desulfurization slurry flash evaporation |
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