CN212425487U - MED seawater desalination system using absorption heat pump coupled evaporator - Google Patents
MED seawater desalination system using absorption heat pump coupled evaporator Download PDFInfo
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- CN212425487U CN212425487U CN202020469868.7U CN202020469868U CN212425487U CN 212425487 U CN212425487 U CN 212425487U CN 202020469868 U CN202020469868 U CN 202020469868U CN 212425487 U CN212425487 U CN 212425487U
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Abstract
The utility model discloses an MED seawater desalination system using absorption heat pump coupling evaporator, including absorption heat pump, evaporator, condenser and heat exchanger, the heat carried by the strong brine and steam exhausted to the evaporator is recovered through heat exchanger and condenser, promote the raw material sea water temperature of evaporator in proper order, and use the steam condensate water/steam as the heating heat source of evaporator and the low temperature heat source of absorption heat pump, heat the raw material sea water many times, improve the raw material sea water temperature entering the evaporator, reduce the seawater desalination running cost, and simultaneously, and utilize the heat of the absorption heat pump recovery waste heat boiler, steam turbine extraction or industrial waste heat as the heating heat source of its high temperature, low temperature heat source and evaporator, reduce the temperature and discharge, reduce the running cost of seawater desalination, not only be applicable to multiple-effect low temperature desalination sea water system, the system is also suitable for brackish water and other multi-effect distillation seawater desalination systems.
Description
The technical field is as follows:
the utility model relates to a power plant heat energy management field especially relates to an utilize MED sea water desalination of absorption heat pump coupling evaporimeter.
Background art:
china has a large population base, the per-capita water resource amount is seriously insufficient, and the water resource shortage becomes one of the bottlenecks in the development of the economic society. Seawater desalination is an effective strategic approach to solve the problem of shortage of fresh water resources. Through years of research, the mature technology for the development of seawater desalination in China includes multi-effect distillation (MED), multi-stage flash evaporation and reverse osmosis seawater desalination. Among them, low-temperature multi-effect distillation (LT-MED) has a large fresh water yield, low-decay candlelicity at low temperature, good system heat economy performance and the like, and is therefore widely used. The low-temperature multi-effect seawater desalination system needs a large amount of steam heat sources, a steam jet compressor is needed for matching the steam temperature, and although the structure is simple, the fire loss is large.
The absorption heat pump is a circulating system which utilizes a low-grade heat source to pump heat from a low-temperature heat source to a high-temperature heat source, is an effective device for recycling low-temperature heat energy, and has double functions of saving energy and protecting the environment. The absorption heat pump mainly comprises four parts, namely a generator, a condenser, an absorber and an evaporator. The generator can be driven by steam or hot water to transfer a low-temperature heat source to a medium-temperature heat source, and is better energy-saving equipment. By using the absorption heat pump to replace a steam jet compressor, various heat sources in the multi-effect distilled seawater desalination system can be integrated, the energy consumption of the multi-effect distilled seawater desalination device is further reduced, and the heat economy is improved.
The utility model has the following contents:
the utility model discloses the technical problem that will solve is: the defects in the prior art are overcome, the heat carried by the strong brine and the steam discharged by the evaporator is recovered, the temperature of the raw material seawater of the evaporator is sequentially raised and used as a heating heat source of the evaporator, and meanwhile, the heat of a waste heat boiler, steam extraction of a steam turbine or industrial waste heat is recovered by an absorption heat pump to replace a steam jet compressor, so that the seawater desalination operation cost is reduced.
The technical scheme of the utility model is that: an MED seawater desalination system using an absorption heat pump coupled with an evaporator comprises the absorption heat pump, the evaporator, a condenser and a heat exchanger, and is characterized in that: the heat exchanger heats the entering raw material seawater, then discharges the raw material seawater into the condenser for further heating, the heated raw material seawater is introduced into the medium-temperature heat source inlet of the absorption heat pump, and is discharged into the evaporator from the medium-temperature heat source outlet after being taken as the medium-temperature heat source of the absorption heat pump for heat absorption, distillation operation is carried out under the heating effect of the internal heating heat source, steam and strong brine generated by the evaporator respectively enter the condenser and the heat exchanger for step-by-step heating of the raw material seawater entering in sequence, the heating heat source in the evaporator enters the low-temperature heat source inlet of the absorption heat pump from the heating heat source outlet and is discharged from the low-temperature heat source outlet after being taken as the low-temperature heat source of the absorption heat pump for heat release.
Further, the number of the absorption heat pumps and the number of the evaporators are at least two.
Furthermore, steam generated by the evaporators enters an adjacent evaporator to be used as a heating source and/or enters a condenser to heat the entering raw seawater, and strong brine generated by the evaporators directly enters the adjacent evaporator to be used as raw seawater and/or enters a heat exchanger to heat the entering raw seawater.
Furthermore, a heating heat source inlet communicated with an internal heating heat source is arranged on the evaporator, and the heating heat source inlet is communicated with a steam outlet on the adjacent evaporator and/or communicated with a high-temperature heat source outlet on the absorption heat pump.
Furthermore, a high-temperature heat source on the absorption heat pump is provided by a waste heat boiler, a steam turbine or industrial waste heat, and is connected with a high-temperature heat source inlet through a pipeline.
Furthermore, a high-temperature heat source on the absorption heat pump is connected with a heating heat source inlet and/or a high-temperature heat source inlet on the adjacent absorption heat pump through a high-temperature heat source outlet.
Further, be provided with the strong brine outlet that discharges the strong brine that the evaporimeter produced on the evaporimeter and/or carry out the strong brine water inlet that receives to the strong brine that adjacent evaporimeter discharged, be provided with the confession on the heat exchanger strong brine gets into and the strong brine import and the strong brine mouth of draining of discharge.
Furthermore, the steam entering the condenser releases heat to the entering raw material seawater and then condenses the raw material seawater into qualified fresh water or serves as a low-temperature heat source of the absorption heat pump.
And further, the heat enters a low-temperature heat source inlet of the absorption heat pump from a heating heat source outlet, and is discharged from the low-temperature heat source outlet to become qualified fresh water after being used as a low-temperature heat source of the absorption heat pump for heat release.
The utility model has the advantages that:
the method comprises the steps of recovering strong brine discharged by an evaporator and heat carried by the steam, sequentially increasing the temperature of raw seawater of the evaporator, taking the steam as a heating heat source of the evaporator and a low-temperature heat source of an absorption heat pump, heating the raw seawater for multiple times, increasing the temperature of the raw seawater entering the evaporator, and reducing the operation cost of seawater desalination.
Description of the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present application.
Fig. 2 is a schematic structural diagram of another embodiment of the present application.
The specific implementation mode is as follows:
example (b): see fig. 1 and 2;
in fig. 1: 1-absorption heat pump, 4-evaporator, 7-condenser, 8-heat exchanger, 9-high temperature heat source inlet, 10-high temperature heat source outlet, 11-heating heat source inlet, 12-heating heat source outlet, 13-low temperature heat source inlet, 14-low temperature heat source outlet, 15-strong brine outlet, 16-medium temperature heat source inlet, 17-medium temperature heat source outlet, 18-steam outlet, 25-raw material seawater inlet, 26-condenser inlet, 27-condenser outlet, 28-condenser, 29-strong brine inlet, 30-strong brine outlet;
in fig. 2: 1-first-stage absorption heat pump, 2-second-stage absorption heat pump, 3-third-stage absorption heat pump, 4-first-effect evaporator, 5-second-effect evaporator, 6-third-effect evaporator, 7-condenser, 8-heat exchanger, 9-first-stage high-temperature heat source inlet, 10-first-stage high-temperature heat source outlet, 11-first-effect heating heat source inlet, 12-first-effect heating heat source outlet, 13-first-stage low-temperature heat source inlet, 14-first-stage low-temperature heat source outlet, 15-first-effect strong brine outlet, 16-first-stage medium-temperature heat source inlet, 17-first-stage medium-temperature heat source outlet, 18-first-effect steam outlet, 19-second-stage high-temperature heat source inlet, 20-second-stage high-temperature heat source outlet, 21-second-stage medium-temperature heat source inlet, 22-second-stage medium-temperature heat source outlet, 23-second-effect heating heat source, 26-condenser inlet, 27-condenser outlet, 28-condenser, 29-strong brine inlet and 30-strong brine outlet.
An MED seawater desalination system using an absorption heat pump coupled with an evaporator comprises the absorption heat pump, the evaporator, a condenser and a heat exchanger, wherein heat carried by concentrated salt water and steam discharged by the evaporator is recovered through the heat exchanger and the condenser, the temperature of raw seawater of the evaporator is sequentially raised, steam condensate water/steam is used as a heating heat source of the evaporator and a low-temperature heat source of the absorption heat pump to heat the raw seawater for multiple times, the temperature of the raw seawater entering the evaporator is raised, the seawater desalination operation cost is reduced, and meanwhile, the heat of waste heat of a waste heat boiler, a steam turbine or industrial waste heat recovered by the absorption heat pump is used as the heating heat source of the high-temperature heat source, the low-temperature heat source and the evaporator, so that the temperature discharge is reduced, and the operation cost of seawater desalination is reduced.
The present application is described in detail below with reference to the drawings and examples.
Example one (see fig. 1):
the heat exchanger 8 heats the raw material seawater entering from the raw material seawater inlet 25, the raw material seawater is discharged from the condenser inlet 26 to the condenser for further heating, the heated raw material seawater enters the intermediate temperature heat source inlet 16 of the absorption heat pump 1 from the condenser outlet 27, the raw material seawater is taken as the intermediate temperature heat source of the absorption heat pump 1 for heat absorption and then is discharged into the evaporator 4 from the intermediate temperature heat source outlet 17, the distillation operation is carried out under the heating effect of the internal heating heat source, the steam and the concentrated brine generated by the evaporator 4 respectively enter the condenser 28 and the heat exchanger 8 from the steam outlet 18 and the concentrated brine outlet 15 for stepwise heating the raw material seawater entering in sequence, the evaporator 4 is provided with a heating heat source inlet 11 communicated with the internal heating source, the heating heat source inlet 11 is communicated with the high temperature heat source outlet 10 on the absorption heat pump 1, the heating source in the evaporator 4 enters the low temperature heat source inlet 13 of the absorption heat pump 1 from the heating source outlet 12, the heat is released as the low-temperature heat source of the absorption heat pump 1 and then discharged from the low-temperature heat source outlet 14.
The high-temperature heat source on the absorption heat pump 1 is provided by a waste heat boiler, a steam turbine or industrial waste heat, and is connected with the absorption heat pump 1 through a high-temperature heat source inlet 9.
The evaporator 4 is provided with a strong brine outlet 15 for discharging strong brine generated by the evaporator 4, and the heat exchanger 8 is provided with a strong brine inlet 29 and a strong brine outlet 30 for allowing the strong brine to enter and discharge.
The steam entering the condenser 7 releases heat and condenses the entering raw material seawater, and then is discharged from the steam condensate outlet 28 to become qualified fresh water or be used as a low-temperature heat source of the absorption heat pump.
In this embodiment, the circulation formed by the evaporator 4, the heat exchanger 8, the condenser 7, the medium temperature heat source inlet 16, and the medium temperature heat source outlet 17 continuously and circularly heats the cooling seawater to raise the temperature of the raw seawater flowing into the evaporator 4; the high-temperature heat source inlet 9, the high-temperature heat source outlet 10, the heating heat source inlet 11, the heating heat source outlet 12, the low-temperature heat source inlet 13 and the low-temperature heat source outlet 13 are communicated with each other, a high-temperature heat source on the absorption heat pump 1 is driven by a waste heat boiler, a steam turbine or industrial waste heat entering the absorption heat pump from the high-temperature heat source inlet 9 to serve as the high-temperature heat source to drive the absorption heat pump generator, after being condensed and cooled, the high-temperature heat source outlet 10 and the heating heat source inlet 11 enter the evaporator 4 to heat raw material seawater, the raw material seawater is cooled in the evaporator 4 and then discharged from the heating heat source outlet 12, the low-temperature heat source inlet 13 enters the absorption heat pump 1 to serve as the low.
Example two (see fig. 2):
the heat exchanger 8 heats the raw material seawater entering from the raw material seawater inlet 25, discharges the raw material seawater from the condenser inlet 26 to the condenser for further heating, the heated raw material seawater enters the medium temperature heat source inlets (the first-stage medium temperature heat source inlet 16, the second-stage medium temperature heat source inlet 21 and the third-stage medium temperature heat source inlet) of the absorption heat pumps (the first-stage absorption heat pump 1, the second-stage absorption heat pump 2 and the third-stage absorption heat pump 3) from the condenser outlet 27, wherein valves are arranged at the second-stage medium temperature heat source inlet 21 and the third-stage medium temperature heat source inlet, and discharges the raw material seawater serving as the medium temperature heat source of the absorption heat pumps after absorbing heat from the medium temperature heat source outlets (the first-stage medium temperature heat source outlet 17, the second-stage medium temperature heat source outlet 22 and the third-stage medium temperature heat source outlet) to the evaporators (the first-effect evaporator 4, the second, the evaporators (4, 5, 6) are provided with a heating heat source inlet and a heating heat source outlet which are communicated with the internal heating heat source.
The steam generated by the evaporators (4, 5, 6) enters the adjacent evaporators (4, 5, 6) as a heating source and/or enters the condenser 7 to heat the entering raw seawater, and the strong brine generated by the evaporators (4, 5, 6) directly enters the adjacent evaporators (4, 5, 6) as the raw seawater and/or enters the heat exchanger 8 to heat the entering raw seawater.
The inlet of the heating heat source is communicated with the steam outlet on the adjacent evaporator (4, 5, 6) and/or communicated with the high-temperature heat source outlet on the absorption heat pump (1, 2, 3).
The high-temperature heat source on the absorption heat pump (1, 2, 3) is provided by a waste heat boiler, a steam turbine for steam extraction or industrial waste heat, and the high-temperature heat source and the steam turbine are connected with each other through a pipeline and a high-temperature heat source inlet. The high-temperature heat source inlet is communicated with the adjacent high-temperature heat source outlet.
The evaporators (4, 5 and 6) are provided with a strong brine outlet for discharging strong brine generated by the evaporators (4, 5 and 6) and/or a strong brine inlet for receiving strong brine discharged by an adjacent evaporator, and the heat exchanger 8 is provided with a strong brine inlet 29 and a strong brine outlet 30 for allowing the strong brine to enter and be discharged.
The steam entering the condenser 7 releases heat to the entering raw material seawater and then condenses into qualified fresh water or serves as a low-temperature heat source of the absorption heat pump.
The heat source enters the low-temperature heat source inlet of the absorption heat pump from the heating heat source outlet, and is discharged from the low-temperature heat source outlet to become qualified fresh water after being used as the low-temperature heat source of the absorption heat pump for heat release.
In the embodiment, steam is extracted by a steam turbine, steam of a waste heat boiler or industrial waste heat enters a primary absorption heat pump 1 to serve as a primary high-temperature heat source to drive an absorption heat pump generator, and after condensation and temperature reduction, the steam enters a primary evaporator 4 from a primary high-temperature heat source outlet 10 and a primary heating heat source inlet 11 to heat raw material seawater, a primary heating heat source in the primary evaporator 4 is cooled by the primary evaporator 4 and then is discharged from a primary heating heat source outlet 12, and the steam enters the primary absorption heat pump 1 from a primary low-temperature heat source inlet 13 to serve as a primary low-temperature heat source, and after further temperature reduction, the steam is discharged from a primary low-temperature heat source outlet; the primary absorption heat pump 1 extracts a primary low-temperature heat source through a primary high-temperature heat source and transfers heat to a primary medium-temperature heat source raw material seawater, the raw material seawater enters the primary absorption heat pump 1 from a primary medium-temperature heat source inlet 16 to absorb heat and raise temperature, then enters the primary evaporator 4 from a primary medium-temperature heat source outlet 17 to be distilled, and steam generated by distillation enters the secondary evaporator 5 from a primary steam outlet 18 to serve as a secondary heating heat source; steam extracted by a steam turbine and steam or industrial waste heat of a waste heat boiler enter a secondary absorption heat pump 2 from a secondary high-temperature heat source inlet 19 to serve as a secondary high-temperature heat source driving absorption heat pump generator, the steam or the industrial waste heat can be used as a high-temperature driving heat source of a tertiary absorption heat pump 3 or used as condensate water to return to a boiler after being condensed and cooled, a secondary heating heat source of a secondary evaporator 5 is sent into the secondary absorption heat pump 2 from a secondary heating heat source outlet 23 and a secondary low-temperature heat source inlet after being cooled and is discharged as qualified fresh water from a secondary low-temperature heat source 24 after being cooled by a secondary low-temperature heat source, and the steam generated by the secondary evaporator 5 enters a three-effect evaporator 6 to complete the same; the steam generated by the triple-effect evaporator 6 enters the condenser 7 for condensation, and the steam condensate water 28 can be used as a low-temperature heat source of the absorption heat pump or can release heat to the raw material seawater to become qualified fresh water.
Strong brine generated by the first-effect evaporator 4 is discharged to the second-effect evaporator 5 from the first-effect strong brine water outlet 15 and the second-effect strong brine water inlet, strong brine generated by the second-effect evaporator 5 is discharged to the third-effect evaporator 6 from the second-effect strong brine water outlet and the third-effect strong brine water inlet, strong brine generated by the third-effect evaporator 6 is sent to the heat exchanger 8 from the strong brine water outlet and the strong brine inlet 29, heat is transferred to raw seawater and then is discharged from the strong brine discharge outlet 30; raw material seawater enters a heat exchanger 8 from a raw material seawater inlet 25, the raw material seawater is discharged into a condenser from a condenser inlet 26 after the heat exchanger 8 absorbs heat of concentrated brine for further heating, the heated raw material seawater enters a medium temperature heat source inlet (a first-stage medium temperature heat source inlet 16, a second-stage medium temperature heat source inlet 21 and a third-stage medium temperature heat source inlet) of an absorption heat pump (a first-stage absorption heat pump 1, a second-stage absorption heat pump 2 and a third-stage absorption heat pump 3) from a condenser outlet 27, wherein valves are arranged at the second-stage medium temperature heat source inlet 21 and the third-stage medium temperature heat source inlet, and the raw material seawater serving as a medium temperature heat source of the absorption heat pump absorbs heat and is discharged into an evaporator (a first-effect evaporator 4, a second-effect evaporator 5 and a third-effect evaporator 6) from a medium temperature heat source outlet (.
The absorption heat pump is a single-effect absorption heat pump or a multiple-effect absorption heat pump, and if the multiple-effect absorption heat pump is adopted, one multiple-effect absorption heat pump can be matched with one or more seawater desalination evaporators (for example, one double-effect absorption heat pump can be matched with one or two seawater desalination evaporators).
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments still fall within the scope of the technical solution of the present invention.
Claims (10)
1. An MED seawater desalination system using an absorption heat pump coupled with an evaporator comprises the absorption heat pump, the evaporator, a condenser and a heat exchanger, and is characterized in that: the heat exchanger heats the entering raw material seawater, then discharges the raw material seawater into the condenser for further heating, the heated raw material seawater is introduced into the medium-temperature heat source inlet of the absorption heat pump, and is discharged into the evaporator from the medium-temperature heat source outlet after being taken as the medium-temperature heat source of the absorption heat pump for heat absorption, distillation operation is carried out under the heating effect of the internal heating heat source, steam and strong brine generated by the evaporator respectively enter the condenser and the heat exchanger for step-by-step heating of the raw material seawater entering in sequence, the heating heat source in the evaporator enters the low-temperature heat source inlet of the absorption heat pump from the heating heat source outlet and is discharged from the low-temperature heat source outlet after being taken as the low-temperature heat source of the absorption heat pump for heat release.
2. The MED seawater desalination system using an absorption heat pump coupled evaporator of claim 1, wherein: the number of the absorption heat pumps and the number of the evaporators are at least two.
3. The MED seawater desalination system using an absorption heat pump coupled evaporator of claim 2, wherein: the steam generated by the evaporator enters an adjacent evaporator to be used as a heating source and/or enters a condenser to heat the entering raw seawater, and the strong brine generated by the evaporator directly enters the adjacent evaporator to be used as raw seawater and/or enters a heat exchanger to heat the entering raw seawater.
4. The MED seawater desalination system using an absorption heat pump coupled evaporator of claim 2, wherein: the evaporator is provided with a heating heat source inlet communicated with an internal heating heat source, and the heating heat source inlet is communicated with a steam outlet on an adjacent evaporator and/or communicated with a high-temperature heat source outlet on the absorption heat pump.
5. An MED seawater desalination system using an absorption heat pump coupled evaporator according to any of claims 1-4, wherein: the high-temperature heat source on the absorption heat pump is provided by a waste heat boiler, a steam turbine or industrial waste heat, and is connected with the high-temperature heat source inlet through a pipeline.
6. The MED seawater desalination system using an absorption heat pump coupled evaporator of claim 5, wherein: and the high-temperature heat source on the absorption heat pump is connected with the heating heat source inlet and/or the high-temperature heat source inlet on the adjacent absorption heat pump through the high-temperature heat source outlet.
7. The MED seawater desalination system using an absorption heat pump coupled evaporator of claim 6, wherein: be provided with the strong brine outlet that discharges the strong brine that the evaporimeter produced on the evaporimeter and/or carry out the strong brine water inlet that receives to the strong brine that adjacent evaporimeter discharged, be provided with the confession on the heat exchanger strong brine gets into and the strong brine import and the strong brine mouth of discharging.
8. The MED seawater desalination system using an absorption heat pump coupled evaporator of claim 7, wherein: and the steam entering the condenser releases heat to the entering raw material seawater and condenses the raw material seawater into qualified fresh water or serves as a low-temperature heat source of the absorption heat pump.
9. The MED seawater desalination system using an absorption heat pump coupled evaporator of claim 8, wherein: the heat source enters the low-temperature heat source inlet of the absorption heat pump from the heating heat source outlet, and is discharged from the low-temperature heat source outlet to become qualified fresh water after being used as the low-temperature heat source of the absorption heat pump for heat release.
10. The MED seawater desalination system using an absorption heat pump coupled evaporator of claim 9, wherein: the absorption heat pump is a single-effect absorption heat pump or a multi-effect absorption heat pump.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111392791A (en) * | 2020-04-02 | 2020-07-10 | 郑州电力高等专科学校 | Multi-effect distillation seawater desalination system combined with heat pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111392791A (en) * | 2020-04-02 | 2020-07-10 | 郑州电力高等专科学校 | Multi-effect distillation seawater desalination system combined with heat pump |
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