CN114151990B - Multifunctional multistage flash evaporation combined heat pump system for comprehensively utilizing solution in desulfurizing tower - Google Patents
Multifunctional multistage flash evaporation combined heat pump system for comprehensively utilizing solution in desulfurizing tower Download PDFInfo
- Publication number
- CN114151990B CN114151990B CN202111435985.7A CN202111435985A CN114151990B CN 114151990 B CN114151990 B CN 114151990B CN 202111435985 A CN202111435985 A CN 202111435985A CN 114151990 B CN114151990 B CN 114151990B
- Authority
- CN
- China
- Prior art keywords
- pipeline
- heat
- heat exchanger
- steam
- flash evaporation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- F25B30/00—Heat pumps
- F25B30/04—Heat pumps of the sorption type
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D15/00—Other domestic- or space-heating systems
- F24D15/04—Other domestic- or space-heating systems using heat pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/0002—Means for connecting central heating radiators to circulation pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- 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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a multifunctional multistage flash evaporation combined heat pump system for comprehensively utilizing a desulfurizing tower solution, which comprises a boiler, a desulfurizing tower, a plurality of heat exchangers, a plurality of absorption heat pumps and a plurality of flash evaporators, wherein the boiler, the desulfurizing tower, the plurality of heat exchangers, the plurality of absorption heat pumps and the plurality of flash evaporators are communicated with one another through pipelines to form a boiler steam/hot water heat recovery flow, a desulfurizing tower solution cooling circulation flow, a boiler flue gas flow, a desulfurizing waste water solution concentration flow and a flash evaporation steam heating heat supply return water flow. According to the invention, a novel flow of a multi-stage flash evaporation concentration combined heat pump for reheating the solution in the desulfurizing tower is constructed according to the principle of 'temperature matching and energy gradient utilization', on one hand, multiple functions of flue gas desulfurization and dust removal, flue gas waste heat utilization, flue gas whitening, desulfurization wastewater concentration and regional heat supply are realized at the same time under the condition of not using an external heat source; on the other hand, the multi-stage flash evaporation concentration efficiency and the heat supply energy efficiency of the desulfurization wastewater are improved.
Description
Technical Field
The invention relates to the field of wastewater treatment technology and flue gas waste heat recovery, in particular to a multifunctional multistage flash evaporation combined heat pump system for comprehensively utilizing a desulfurizing tower solution.
Background
Limestone-gypsum wet flue gas desulfurization technology is widely applied in China due to high desulfurization efficiency. But in actual operation, a certain amount of desulfurization waste water is discharged. The part of wastewater has the water quality characteristics of high suspended matter, high salt content, various heavy metals and the like, so the treatment difficulty is high; in the existing desulfurization wastewater concentration treatment technology, membrane method concentration, thermal method concentration and flue evaporation are mainly used as treatment processes, wherein the membrane method concentration realizes separation and concentration according to different particle sizes to achieve the purpose of concentration, but the membrane and equipment surfaces are easy to scale, and the later-period operation and maintenance cost is high; the multi-effect evaporation MED technology in the thermal method concentration needs to adopt high-quality raw steam as a heat source, generates additional energy consumption, and has large investment and high operation requirement; in the smoke driven MED technology, although smoke waste heat is utilized, high-quality smoke waste heat is adopted, and smoke latent heat is not fully utilized; the MVR technology needs to consume a large amount of electric energy, has high operation cost and is easy to scale; the flue evaporation process has limited water treatment amount and is easy to form scale in the flue. Therefore, how to efficiently treat the desulfurization wastewater is an important problem to be solved urgently.
On the other hand, in the wet desulphurization process, a large amount of water is evaporated to enter the flue gas, so that the moisture content of the flue gas is increased, and the formed white smoke plume is directly discharged, so that on one hand, water resource waste is caused, and on the other hand, a large amount of latent heat is also wasted. At present, the waste heat of flue gas is used for concentrating the desulfurization waste water, but the waste heat of high-temperature flue gas in front of a desulfurization tower is mostly adopted, so that the waste heat of flue gas is utilized for concentrating and reducing the desulfurization waste water, latent heat contained in the flue gas is not fully recovered, and a large amount of energy is wasted.
In order to solve the problems, a multifunctional multistage flash evaporation combined heat pump system for comprehensively utilizing the solution of the desulfurizing tower is developed, multiple functions of flue gas desulfurization and dust removal, flue gas waste heat utilization, flue gas white elimination, desulfurization wastewater concentration and regional heat supply are realized simultaneously under the condition of not using an external heat source, the waste heat resource of the system is fully excavated, and waste materials are changed into valuable materials.
In the current situation of carrying out multistage flash distillation to desulfurization waste water by utilizing flue gas waste heat, chinese patent with patent number 201920868653.X discloses a multistage flash distillation desulfurization waste water treatment device, utilize dust remover export flue gas waste heat heating desulfurization waste water, and send the desulfurization waste water that the temperature rose into multistage flash evaporation system, reuse the flash evaporation steam of last level as the heat source of next level of vaporization system, but this method does not fully retrieve the latent heat that contains in the flue gas, flue gas waste heat recovery rate is low, and the tail end directly adopts comdenstion water condensation flash evaporation steam again, do not rationally utilize steam heat, cause partly unnecessary energy loss.
Disclosure of Invention
The invention aims to provide a multifunctional multistage flash evaporation combined heat pump system for comprehensively utilizing a desulfurizing tower solution, which simultaneously realizes multiple functions of flue gas desulfurization and dust removal, flue gas waste heat utilization, flue gas white elimination, desulfurization wastewater concentration and regional heat supply without an external heat source, fully excavates waste heat resources and changes waste into valuables.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a multifunctional multi-stage flash evaporation combined heat pump system for comprehensively utilizing a desulfurizing tower solution, which comprises a boiler, a desulfurizing tower, a plurality of heat exchangers, a plurality of absorption heat pumps and a plurality of flash evaporators, wherein the boiler, the desulfurizing tower, the plurality of heat exchangers, the plurality of absorption heat pumps and the plurality of flash evaporators are communicated with one another through pipelines to form a boiler steam/hot water heat recovery flow, a desulfurizing tower solution cooling circulation flow, a boiler flue gas flow, a desulfurizing waste water solution concentration flow and a flash steam heating heat supply water return flow.
Furthermore, the boiler steam/hot water heat recovery process is formed by communicating a boiler, a first absorption heat pump, a second absorption heat pump and a fourth heat exchanger through a plurality of pipelines, high-temperature/steam hot water at the top of the boiler flows out and is divided through a first pipeline, one part of the high-temperature/steam hot water flows into a generator of the first absorption heat pump through a second pipeline, flows out through the fourth pipeline after heat exchange and cooling, flows into a generator of the second absorption heat pump through a third pipeline, flows out through a fifth pipeline after heat exchange and cooling, is combined with condensed water from the fourth pipeline, then enters the fourth heat exchanger through a sixth pipeline, exchanges heat with desulfurization wastewater after secondary flash evaporation from a nineteenth pipeline in the heat exchanger of the fourth heat exchanger, and returns to the boiler through a seventh pipeline after heat exchange and cooling.
Furthermore, a desulfurizing tower, a first absorption heat pump, a fifth heat exchanger and a second absorption heat pump are communicated through a plurality of pipelines in the desulfurizing tower solution cooling circulation process, circulating absorption liquid in the desulfurizing tower enters an evaporator of the first absorption heat pump through an eleventh pipeline, is pressurized through a circulating pump after being cooled, then is combined with steam from an eighteenth pipeline through a twelfth pipeline, and then is sent to the fifth heat exchanger through a thirty-first pipeline, and is subjected to heat exchange and temperature rise with concentrated solution after four-stage flash evaporation from a twenty-seventh pipeline in the fifth heat exchanger, and is subjected to secondary combination with condensed water from a thirty-third pipeline after heat exchange and temperature rise, then enters an evaporator of the second absorption heat pump for cooling again, and finally is sent to a spraying layer of the desulfurizing tower through a thirty-fourth pipeline to be directly contacted with low-temperature flue gas for heat exchange.
Further, boiler flue gas flow is constituteed boiler, first heat exchanger and desulfurizing tower intercommunication through many pipelines, and in the boiler flue gas passed through flue gas pipeline and got into first heat exchanger, heating desulfurization waste water solution back along the ninth pipeline entering desulfurizing tower carries out the low temperature and sprays in first heat exchanger, and the clean flue gas that produces after abundant desulfurization is handled is along clean flue gas pipeline discharge.
Furthermore, the desulfurization wastewater solution concentration process is formed by communicating a desulfurization tower, a first absorption heat pump, a first heat exchanger, a first flash evaporator, a second flash evaporator, a fourth heat exchanger, a second absorption heat pump, a third flash evaporator, a fourth flash evaporator and a fifth heat exchanger through a plurality of pipelines, the desulfurization wastewater solution in the desulfurization tower enters the first absorption heat pump through a thirteenth pipeline, enters the first heat exchanger through a fourteenth pipeline, is subjected to cascade heating, enters the first flash evaporator through a fifteenth pipeline, is subjected to primary flash evaporation treatment, and primary flash evaporation steam flows out to the second heat exchanger along the sixteenth pipeline; the desulfurized wastewater after the primary flash evaporation enters a second flash evaporator along a seventeenth pipeline for secondary flash evaporation treatment, and secondary flash evaporation steam flows out along an eighteenth pipeline, then is combined with the circulating absorption liquid from a twelfth pipeline, and enters the next process;
and the desulfurized wastewater after the second-stage flash evaporation enters a fourth heat exchanger through a nineteenth pipeline to increase the temperature, then enters a second absorption heat pump through a twentieth pipeline to increase the flash evaporation temperature again, then enters a third flash evaporator through a twenty-first pipeline to perform third-stage flash evaporation treatment, the third-stage flash evaporation steam enters a second heat exchanger after being converged with the first-stage flash evaporation steam from the sixteenth pipeline through a twenty-second pipeline and then enters a second heat exchanger to heat the heat supply network water, the desulfurized wastewater after the third-stage flash evaporation enters a fourth flash evaporator along a twenty-third pipeline to perform fourth-stage flash evaporation treatment, the fourth-stage flash evaporation steam and the steam from a twenty-fifth pipeline are converged and then preheat the heat supply network water, the desulfurized wastewater after the fourth-stage flash evaporation enters a fifth heat exchanger through a twenty-seventh pipeline, and exchanges heat with the circulating absorption liquid from the thirty-first pipeline in the fifth heat exchanger to cool the desulfurized wastewater to generate a concentrated solution product, and finally the concentrated solution product flows out along a twenty-eighth pipeline and then enters a subsequent process.
Further, the flash steam heating heat supply backwater flow comprises a second heat exchanger and a third heat exchanger, wherein fourth-stage flash steam from a twenty-sixth pipeline and steam from a twenty-fifth pipeline are merged and then enter the third heat exchanger through a twenty-ninth pipeline, heat supply backwater from a thirty-seventh pipeline is preheated in the third heat exchanger, and the heat supply backwater flows out along the thirtieth pipeline after heat exchange and temperature reduction; the condensed water flowing out along the thirtieth pipeline and the thirty-second pipeline are converged to the thirty-third pipeline to continuously flow; the first-stage flash steam from the sixteenth pipeline and the third-stage flash steam from the twenty-second pipeline are converged, then enter the second heat exchanger through the twenty-fourth pipeline, heat the heat supply network water from the thirty-fifth pipeline in the second heat exchanger, the condensed water with the reduced temperature flows out along the twenty-fifth pipeline, and the condensed water flows out through the thirty-sixth pipeline after being heated to supply heat and water.
Further, a first circulating pump is installed on the fourteenth pipeline.
Further, a second circulating pump is installed on the twelfth pipeline.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a multifunctional multistage flash evaporation combined heat pump system for comprehensively utilizing a desulfurizing tower solution, which comprises a boiler, a desulfurizing tower, a plurality of heat exchangers, a plurality of absorption heat pumps and a plurality of flash evaporators which are communicated with each other, and mainly realizes the effects of three aspects:
1) The multifunctional smoke purification system has the advantages that multiple functions are realized, multiple functions of smoke desulfurization and dust removal, smoke waste heat utilization, smoke whitening, desulfurization waste water concentration and regional heat supply are realized simultaneously under the condition of not using an external heat source through reasonably constructing a new system flow, the waste heat resources of the system are fully excavated, and waste materials are changed into valuable materials;
2) Constructing a temperature-aligned step heating process to improve the energy efficiency of the system, constructing the system according to the principle of 'temperature alignment and energy step utilization', wherein high-temperature steam hot water of a boiler firstly drives an absorption heat pump, and then preheats a solution subjected to secondary flash evaporation; preheating a solution in a desulfurizing tower by using boiler flue gas, and then entering the desulfurizing tower for spraying; the desulfurization wastewater solution is subjected to a series flow, the flash evaporation temperature is firstly increased step by an absorption heat pump and a heat exchanger, then the desulfurization wastewater solution sequentially enters a two-stage flash evaporator for flash evaporation concentration, the flash evaporation temperature is increased again by the heat exchanger and the absorption heat pump, then the desulfurization wastewater solution sequentially enters a third-stage flash evaporator and a fourth-stage flash evaporator for flash evaporation concentration, and a concentrated solution product is obtained after the desulfurization wastewater solution is cooled by the heat exchanger; the steam of each flash tank adopts a series-parallel flow, the water side of a heat supply network adopts a series flow, and the heat supply network water is heated by the flash steam step by step. The system fully realizes the cascade utilization of energy, and greatly improves the energy efficiency of the system;
3) The efficiency of flash distillation is improved, through constructing the new flow of combination formula heat pump, the ingenious absorption heat pump that utilizes preheats the intensification to desulfurization waste water solution, promotes its flash distillation temperature, has improved the efficiency of multistage flash distillation.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic view of a multifunctional multi-stage flash evaporation combined heat pump system for comprehensive utilization of a desulfurizing tower solution;
description of reference numerals: 1. a boiler; 2. a first heat exchanger; 3. a first circulation pump; 4. a first absorption heat pump; 5. a desulfurizing tower; 6. a second circulation pump; 7. a second absorption heat pump; 8. a second heat exchanger; 9. a third heat exchanger; 10. a first flash evaporator; 11. a second flash evaporator; 12. a fourth heat exchanger; 13. a third flash evaporator; 14. a fourth flash evaporator; 15. a fifth heat exchanger;
p1, a first pipeline; p2, a second pipeline; p3, a third pipeline; p4, a fourth pipeline; p5, a fifth pipeline; p6, a sixth pipeline; p7, a seventh pipeline; p8, a flue gas pipeline; p9, a ninth pipeline; p10, cleaning a flue gas pipeline; p11, an eleventh pipeline; p12, a twelfth pipeline; p13, thirteenth pipe; p14, a fourteenth pipeline; p15, a fifteenth pipeline; p16, sixteenth conduit; p17, seventeenth pipeline; p18, an eighteenth pipeline; p19, nineteenth conduit; p20, twentieth pipe; p21, twenty-first pipe; p22, a twenty-second conduit; p23, a twenty-third conduit; p24, a twenty-four conduit; p25, a twenty-fifth pipeline; p26, a twenty-sixth pipeline; p27, a twenty-seventh pipeline; p28, twenty-eighth conduit; p29, a twenty-ninth pipeline; p30, thirtieth pipeline; p31, a thirty-first pipe; p32, a thirty-second pipeline; p33, thirty-third conduit; p34, a thirty-fourth conduit; p35, thirty-fifth pipe; p36, thirty-sixth pipeline; p37, thirty-seventh pipe.
Detailed Description
As shown in fig. 1, a multifunctional multistage flash evaporation combined heat pump system for comprehensive utilization of a desulfurization tower solution comprises a boiler 1, a desulfurization tower 5, a plurality of heat exchangers, a plurality of absorption heat pumps and a plurality of flash evaporators, wherein the boiler 1, the desulfurization tower 5, the plurality of heat exchangers, the plurality of absorption heat pumps and the plurality of flash evaporators are communicated with one another through pipelines to form a boiler steam/hot water heat recovery flow, a desulfurization tower solution cooling circulation flow, a boiler flue gas flow, a desulfurization wastewater solution concentration flow and a flash steam heating heat supply return flow.
Specifically, the boiler steam/hot water heat recovery process is formed by communicating a boiler 1, a first absorption heat pump 4, a second absorption heat pump 7 and a fourth heat exchanger 12 through a plurality of pipelines, high-temperature steam/hot water at the top of the boiler 1 flows out and is divided through a first pipeline P1, a part of the high-temperature steam/hot water flows into a generator of the first absorption heat pump 4 through a second pipeline P2, flows out through a fourth pipeline P4 after heat exchange and temperature reduction, flows into a generator of the second absorption heat pump 7 through a third pipeline P3, flows out through a fifth pipeline P5 after heat exchange and temperature reduction and is merged with condensed water from the fourth pipeline P4, then enters the fourth heat exchanger 12 through a sixth pipeline P6, exchanges heat with desulfurization wastewater after secondary flash evaporation from a nineteenth pipeline P19 in the heat exchanger of the fourth heat exchanger 12, and returns to the boiler 1 through a seventh pipeline P7 after heat exchange and cooling.
In this flow, boiler steam/hot water is at first used as the flue gas waste heat that contains in the drive heat source recovery circulation absorption liquid of first absorption heat pump 4, is used for preheating desulfurization waste water solution with the heat, and in the same way, the system waste heat that contains is retrieved as the drive heat source of second absorption heat pump 7 to be used for heating desulfurization waste water solution after the second grade flash distillation with the heat, return the boiler after the heat transfer cooling of fourth heat exchanger 12 after the confluence, thereby realized the effectual cascade utilization of high temperature steam/hydrothermal heat.
Specifically, the cooling circulation flow of the solution in the desulfurization tower is formed by communicating a desulfurization tower 5, a first absorption heat pump 4, a fifth heat exchanger 15 and a second absorption heat pump 7 through a plurality of pipelines, a circulating absorption solution in the desulfurization tower 5 enters an evaporator of the first absorption heat pump 4 through an eleventh pipeline P11, is pressurized by a circulating pump after being cooled, then merges with steam from an eighteenth pipeline P18 through a twelfth pipeline P12, and then is sent into the fifth heat exchanger 15 through a thirty-first pipeline P31, and exchanges heat with a concentrated solution after four-stage flash evaporation from a twenty-seventh pipeline P27 in the fifth heat exchanger 15 to heat and raise the temperature, after heat exchange and temperature rise, the concentrated solution after secondary merging with condensed water from a thirty-first pipeline P30, then enters an evaporator of the second absorption heat pump 7 to cool again, and finally is sent into a spray layer of the desulfurization tower 5 through a thirty-fourth pipeline P34 to directly contact with low-temperature flue gas for heat exchange. And a second circulating pump 6 is installed on the twelfth pipeline P12, and the second circulating pump 6 is used for providing power for the normal operation of the cooling circulation flow of the desulfurizing tower solution in the desulfurizing tower 5.
Utilize combination formula heat pump to carry out a lot of cooling to the circulation absorption liquid in the 5 flows of desulfurizing tower in this flow, and then degree of depth retrieves flue gas waste heat, realizes preheating and reheating desulfurization waste water to send the circulation absorption liquid that the temperature reduces into the desulfurizing tower and spray the layer, with low temperature flue gas direct contact, thereby reduce export flue gas temperature, reduce the flue gas moisture content, realize that the flue gas disappears and whiten. In addition, the flash steam condensate water is used as the make-up water of the circulating absorption liquid, so that zero emission of the desulfurization wastewater is realized.
Specifically, boiler flue gas flow is constituteed boiler 1, first heat exchanger 2 and desulfurizing tower 5 intercommunication through many pipelines, and in boiler flue gas passed through flue gas pipeline P8 and got into first heat exchanger 2, in heating desulfurization waste water solution in first heat exchanger 2 and following ninth pipeline P9 entering desulfurizing tower 5, spray layer and low temperature circulation absorption liquid direct contact at the desulfurizing tower, carry out the low temperature and spray, and the clean flue gas that produces after abundant desulfurization treatment discharges along clean flue gas pipeline P10. The boiler flue gas is subjected to primary heat exchange and low-temperature spraying in the desulfurizing tower, and is discharged after desulfurization treatment, and the discharged clean flue gas meets the environmental protection requirement, so that the pollution to the air is greatly reduced.
Specifically, in the desulfurization wastewater solution concentration process, a desulfurization tower 5, a first absorption heat pump 4, a first heat exchanger 2, a first flash evaporator 10, a second flash evaporator 11, a fourth heat exchanger 12, a second absorption heat pump 7, a third flash evaporator 13, a fourth flash evaporator 14 and a fifth heat exchanger 15 are communicated through a plurality of pipelines, the desulfurization wastewater solution in the desulfurization tower 5 enters the first absorption heat pump 4 through a thirteenth pipeline P13, enters the first heat exchanger 2 through a fourteenth pipeline P14 to complete step heating, then enters the first flash evaporator 10 through a fifteenth pipeline P15 to perform primary flash evaporation treatment, and primary flash evaporation steam flows out to the second heat exchanger 8 along a sixteenth pipeline P16; the desulfurized wastewater after the primary flash evaporation enters a second flash evaporator 11 along a seventeenth pipeline P17 for secondary flash evaporation treatment, and secondary flash evaporation steam flows out along an eighteenth pipeline P18 and then is combined with the circulating absorption liquid from a twelfth pipeline P12 and enters the next process; the desulfurized wastewater after the second-stage flash evaporation enters a fourth heat exchanger 12 through a nineteenth pipeline P19 to raise the temperature, then enters a second absorption heat pump 7 through a twentieth pipeline P20 to raise the flash evaporation temperature again, and then enters a third flash evaporator 13 through a twenty-first pipeline P21 to carry out third-stage flash evaporation treatment, third-stage flash evaporation steam is converged with first-stage flash evaporation steam from a sixteenth pipeline P16 through a twenty-twelfth pipeline P22 and then enters a second heat exchanger 8 through a twenty-fourteenth pipeline P24 to heat network water, desulfurized wastewater after the third-stage flash evaporation enters a fourth flash evaporator 14 along a twenty-third pipeline P23 to carry out fourth-stage flash evaporation treatment, fourth-stage flash evaporation steam is converged with steam from a twenty-fifth pipeline P25 to preheat network water, desulfurized wastewater after the second-stage flash evaporation is entered a fifth heat exchanger 15 through a twenty-seventh pipeline P27, and is subjected to heat exchange with circulating absorption liquid from a thirty pipeline P31 in the fifth heat exchanger to cool the desulfurized wastewater to generate a concentrated solution product, and finally, the concentrated solution product flows out along a twenty-eighth pipeline P28 and then enters a subsequent process. The fourteenth pipeline P14 is provided with a first circulating pump 3, and the first circulating pump 3 provides a flow rotating force for a desulfurization wastewater solution concentration process.
Specifically, utilize first absorption heat pump 4 to retrieve the flue gas waste heat that contains from the circulation absorption liquid earlier for to the first heating of desulfurization waste water solution, the flue gas waste heat before the reuse is not desulfurized carries out the secondary heating through first heat exchanger 2 to desulfurization waste water solution, the effectual flash distillation temperature that has improved desulfurization waste water. In general, the desulfurization wastewater solution is subjected to a series flow, the flash evaporation temperature is firstly increased step by an absorption heat pump and a heat exchanger, then the desulfurization wastewater solution sequentially enters a two-stage flash evaporator for flash evaporation concentration, the flash evaporation temperature is increased again by the heat exchanger and the absorption heat pump, then the desulfurization wastewater solution sequentially enters a third-stage flash evaporator and a fourth-stage flash evaporator for flash evaporation concentration, and a concentrated solution product is obtained after the desulfurization wastewater solution is cooled by the heat exchanger. The heat sources of the process come from the system, the system is originally saved, the full recycling of waste heat resources in the high-temperature steam hot water of the boiler and the flue gas of the boiler is realized, the energy is saved, and the waste is changed into valuable.
Specifically, the flash steam heating heat supply backwater flow comprises a second heat exchanger 8 and a third heat exchanger 9, firstly, four-stage flash steam from a twenty-sixth pipeline P26 and steam from a twenty-fifth pipeline P25 are merged and then enter the third heat exchanger 9 through a twenty-ninth pipeline P29, heat supply backwater from a seventeenth pipeline P37 is preheated in the third heat exchanger, and the heat supply backwater flows out along a thirtieth pipeline P30 after heat exchange and temperature reduction; the condensed water flowing out along the thirtieth pipeline P30 and the thirty-second pipeline P32 are merged into the thirty-third pipeline P33 to continuously flow; secondly, the first-stage flash steam from the sixteenth pipeline P16 and the third-stage flash steam from the twenty-second pipeline P22 are merged and then enter the second heat exchanger 8 through the twenty-fourth pipeline P24, heat network water from the thirty-fifth pipeline P35 is heated in the second heat exchanger 8, the condensed water with the reduced temperature flows out along the twenty-fifth pipeline P25, and the heated network water flows out through the thirty-sixth pipeline P36 to supply heat and water.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (3)
1. The utility model provides a multi-functional multistage flash distillation combination formula heat pump system that desulfurizing tower solution was used multipurposely which characterized in that: the system comprises a boiler (1), a desulfurizing tower (5), a plurality of heat exchangers, a plurality of absorption heat pumps and a plurality of flash evaporators, wherein the boiler (1), the desulfurizing tower (5), the plurality of heat exchangers, the plurality of absorption heat pumps and the plurality of flash evaporators are communicated with one another through pipelines to form a boiler steam/hot water heat recovery flow, a desulfurizing tower solution cooling circulation flow, a boiler flue gas flow, a desulfurizing wastewater solution concentration flow and a flash steam heating heat supply water return flow;
the boiler steam/hot water heat recovery process is formed by communicating a boiler (1), a first absorption heat pump (4), a second absorption heat pump (7) and a fourth heat exchanger (12) through a plurality of pipelines, high-temperature steam/hot water at the top of the boiler (1) flows out and is divided through a first pipeline (P1), one part of the high-temperature steam/hot water flows into a generator of the first absorption heat pump (4) through a second pipeline (P2), flows out through a fourth pipeline (P4) after heat exchange and temperature reduction, the other part of the high-temperature steam/hot water flows into a generator of the second absorption heat pump (7) through a third pipeline (P3), flows out through a fifth pipeline (P5) after heat exchange and temperature reduction and is combined with condensed water from the fourth pipeline (P4), then flows into the fourth heat exchanger (12) through a sixth pipeline (P6), and exchanges heat with desulfurization wastewater after secondary flash evaporation from a nineteenth pipeline (P19) in a heat exchanger of the fourth heat exchanger (12), and returns to the boiler (1) through a seventh pipeline (P7);
the cooling circulation process of the solution in the desulfurizing tower is formed by communicating a desulfurizing tower (5), a first absorption heat pump (4), a fifth heat exchanger (15) and a second absorption heat pump (7) through a plurality of pipelines, circulating absorption liquid in the desulfurizing tower (5) enters an evaporator of the first absorption heat pump (4) through an eleventh pipeline (P11), is pressurized by a circulating pump after being cooled, then is converged with steam from an eighteenth pipeline (P18) through a twelfth pipeline (P12), then is sent into the fifth heat exchanger (15) through a thirty-first pipeline (P31), and is subjected to heat exchange and temperature rise with concentrated solution obtained after four-stage flash evaporation from a twenty-seventh pipeline (P27) in the fifth heat exchanger (15), and is subjected to secondary confluence with condensed water from a thirty-first pipeline (P30) after heat exchange and temperature rise, then enters an evaporator of the second absorption heat pump (7) for cooling again, and finally is sent into a spray layer of the desulfurizing tower (5) through a fourteenth pipeline (P34) to be directly contacted with low-temperature flue gas;
the boiler flue gas flow is formed by communicating a boiler (1), a first heat exchanger (2) and a desulfurizing tower (5) through a plurality of pipelines, boiler flue gas enters the first heat exchanger (2) through a flue gas pipeline (P8), a desulfurization wastewater solution is heated in the first heat exchanger (2) and then enters the desulfurizing tower (5) along a ninth pipeline (P9) for low-temperature spraying, and clean flue gas generated after full desulfurization is discharged along a clean flue gas pipeline (P10);
the desulfurization wastewater solution concentration process is formed by communicating a desulfurization tower (5), a first absorption heat pump (4), a first heat exchanger (2), a first flash evaporator (10), a second flash evaporator (11), a fourth heat exchanger (12), a second absorption heat pump (7), a third flash evaporator (13), a fourth flash evaporator (14) and a fifth heat exchanger (15) through a plurality of pipelines, the desulfurization wastewater solution in the desulfurization tower (5) enters the first absorption heat pump (4) through a thirteenth pipeline (P13), enters the first heat exchanger (2) through a fourteenth pipeline (P14) after being subjected to step heating, enters the first flash evaporator (10) through a fifteenth pipeline (P15) for primary flash evaporation treatment, and primary flash evaporation steam flows out to the second heat exchanger (8) along a sixteenth pipeline (P16); the desulfurized wastewater after the primary flash evaporation enters a second flash evaporator (11) along a seventeenth pipeline (P17) for secondary flash evaporation treatment, and secondary flash evaporation steam flows out along an eighteenth pipeline (P18) and then is merged with circulating absorption liquid from a twelfth pipeline (P12) and enters the next process;
the desulfurized wastewater after the second-stage flash evaporation enters a fourth heat exchanger (12) through a nineteenth pipeline (P19) to increase the temperature, then enters a second absorption heat pump 7 through a twentieth pipeline (P20) to increase the flash evaporation temperature again, then enters a third flash evaporator (13) through a twenty-first pipeline (P21) to perform third-stage flash evaporation treatment, third-stage flash evaporation steam is converged with first-stage flash evaporation steam from a sixteenth pipeline (P16) through a twenty-twelfth pipeline (P22) and then enters a second heat exchanger (8) through a twenty-fourteenth pipeline (P24) to heat network water, desulfurized wastewater after the third-stage flash evaporation enters a fourth flash evaporator (14) along a twenty-third pipeline (P23) to perform fourth-stage flash evaporation treatment, the flash evaporation steam is converged with steam from a twenty-fifth pipeline (P25) to preheat the network water, desulfurized wastewater after the fourth-stage flash evaporation enters a fifth heat exchanger (15) through a twenty-seventh pipeline (P27), and finally enters an eighth heat exchanger product after being cooled with concentrated cycle absorption liquid from a thirty pipeline (P31) in a fifth heat exchanger (P28) to flow out of a subsequent process;
the flash steam heating heat supply backwater flow comprises a second heat exchanger (8) and a third heat exchanger (9), four-stage flash steam from a twenty-sixth pipeline (P26) and steam from a twenty-fifth pipeline (P25) are merged and then enter the third heat exchanger (9) through a twenty-ninth pipeline (P29), heat supply backwater from a seventeenth pipeline (P37) is preheated in the third heat exchanger, and the heat supply backwater flows out along a thirtieth pipeline (P30) after heat exchange and temperature reduction; the condensed water flowing out along the thirtieth pipeline (P30) and the thirty-second pipeline (P32) are merged into the thirty-third pipeline (P33) to continue flowing; the first-stage flash steam from the sixteenth pipeline (P16) and the third-stage flash steam from the twenty-second pipeline (P22) are combined, then the first-stage flash steam enters the second heat exchanger (8) through the twenty-fourth pipeline (P24), heat network water from the thirty-fifth pipeline (P35) is heated in the second heat exchanger (8), the condensed water with the reduced temperature flows out along the twenty-fifth pipeline (P25), and the network water flows out through the thirty-sixteenth pipeline (P36) after being heated to supply heat and water.
2. The multifunctional multistage flash evaporation combined heat pump system for comprehensive utilization of the desulfurization tower solution as recited in claim 1, wherein: and a first circulating pump (3) is arranged on the fourteenth pipeline (P14).
3. The multifunctional multistage flash evaporation combined heat pump system for comprehensive utilization of the desulfurization tower solution as recited in claim 1, characterized in that: and a second circulating pump (6) is arranged on the twelfth pipeline (P12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111435985.7A CN114151990B (en) | 2021-11-29 | 2021-11-29 | Multifunctional multistage flash evaporation combined heat pump system for comprehensively utilizing solution in desulfurizing tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111435985.7A CN114151990B (en) | 2021-11-29 | 2021-11-29 | Multifunctional multistage flash evaporation combined heat pump system for comprehensively utilizing solution in desulfurizing tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114151990A CN114151990A (en) | 2022-03-08 |
| CN114151990B true CN114151990B (en) | 2022-12-20 |
Family
ID=80784403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111435985.7A Active CN114151990B (en) | 2021-11-29 | 2021-11-29 | Multifunctional multistage flash evaporation combined heat pump system for comprehensively utilizing solution in desulfurizing tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114151990B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114791120A (en) * | 2022-04-15 | 2022-07-26 | 华能营口热电有限责任公司 | Heat supply system and method for determining liquid inlet quantity of electric boiler |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008224148A (en) * | 2007-03-14 | 2008-09-25 | Miura Co Ltd | Steam supply system |
| CN107238227A (en) * | 2017-06-21 | 2017-10-10 | 燕山大学 | A kind of fume afterheat depth recovery system based on Absorption heat-transformer |
| CN109073288A (en) * | 2016-05-11 | 2018-12-21 | 山石科技有限公司 | Absorption heat pump and control method |
| CN210367047U (en) * | 2019-06-11 | 2020-04-21 | 吕龙 | Multistage flash distillation desulfurization effluent treatment plant |
| CN113007921A (en) * | 2021-04-01 | 2021-06-22 | 煤科院节能技术有限公司 | Boiler waste heat cascade utilization and deep water heat recovery system based on absorption heat pump |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7658335B2 (en) * | 2007-01-26 | 2010-02-09 | Thermodynamic Process Control, Llc | Hydronic heating system |
-
2021
- 2021-11-29 CN CN202111435985.7A patent/CN114151990B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008224148A (en) * | 2007-03-14 | 2008-09-25 | Miura Co Ltd | Steam supply system |
| CN109073288A (en) * | 2016-05-11 | 2018-12-21 | 山石科技有限公司 | Absorption heat pump and control method |
| CN107238227A (en) * | 2017-06-21 | 2017-10-10 | 燕山大学 | A kind of fume afterheat depth recovery system based on Absorption heat-transformer |
| CN210367047U (en) * | 2019-06-11 | 2020-04-21 | 吕龙 | Multistage flash distillation desulfurization effluent treatment plant |
| CN113007921A (en) * | 2021-04-01 | 2021-06-22 | 煤科院节能技术有限公司 | Boiler waste heat cascade utilization and deep water heat recovery system based on absorption heat pump |
Non-Patent Citations (2)
| Title |
|---|
| 《基于第一类吸收式热泵的气体分馏塔物料梯级加热方法》;李岩;《石油炼制与化工》;20141231;全文 * |
| 《烟气余热回收系统的优化改造》;赵春锋;《中国高新技术企业》;20161231;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114151990A (en) | 2022-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102954616B (en) | Exhaust steam direct-absorption type lithium bromide heat pump system | |
| CN201181044Y (en) | Large-temperature difference central heating unit | |
| CN105399169B (en) | Multi-effect plate-type distillation seawater desalination system and method utilizing low-grade heat energy | |
| CN102807259A (en) | Heat pump distillation system of residual ammonia water | |
| CN107337245A (en) | A kind of spraying system that desulfurization wastewater is concentrated using fume afterheat | |
| CN106369866A (en) | Waste steam directly absorbed type double-effect lithium bromide heat pump system and working method thereof | |
| CN101793171A (en) | Combined heat and power system for directly recovering exhaust afterheat of power station steam turbine by absorption heat pump | |
| CN212799705U (en) | High-salinity wastewater evaporative concentration and fresh water recovery device utilizing industrial low-temperature waste heat | |
| CN202808402U (en) | Residual ammonia water heat pump distillation system | |
| CN114151990B (en) | Multifunctional multistage flash evaporation combined heat pump system for comprehensively utilizing solution in desulfurizing tower | |
| CN203108242U (en) | Double-effect evaporation system used for ammonium sulphate concentration | |
| CN201093799Y (en) | Waste water disposal and heat-energy recovering apparatus combining solar energy and heat pump | |
| CN112875785A (en) | Deep treatment system and method for wet desulphurization wastewater of coal-fired boiler | |
| CN202193615U (en) | Dilute sulfuric acid concentration processing equipment | |
| CN209922933U (en) | Sodium chloride forced circulation crystallization device in flue gas desulfurization waste water | |
| CN217287198U (en) | MVR evaporation concentration system | |
| CN206751452U (en) | A kind of spraying system that desulfurization wastewater is concentrated using fume afterheat | |
| CN111517400B (en) | Low-grade heat source coupling multi-effect flash evaporation concentration evaporation system | |
| CN212269520U (en) | High-salinity wastewater system utilizing photo-thermal evaporation crystallization | |
| CN211676993U (en) | A waste gas recovery device for chemical industry enterprise | |
| CN213231584U (en) | Desulfurization waste water high temperature flash distillation processing apparatus | |
| CN214299359U (en) | MVR high-efficiency energy-saving evaporation treatment system for nano-silver industrial wastewater treatment | |
| CN213777787U (en) | Titanium tube heat exchanger for recovering low-temperature flue gas waste heat | |
| CN212924704U (en) | High salt waste water zero release processing system based on low temperature waste heat circulation flash distillation | |
| CN111320220A (en) | Process and device for concentrating high-salinity wastewater by circularly stripping air or industrial gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |