CN111892110A - Solution energy storage type seawater desalination system - Google Patents
Solution energy storage type seawater desalination system Download PDFInfo
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- CN111892110A CN111892110A CN202010812558.5A CN202010812558A CN111892110A CN 111892110 A CN111892110 A CN 111892110A CN 202010812558 A CN202010812558 A CN 202010812558A CN 111892110 A CN111892110 A CN 111892110A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/06—Flash evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/14—Treatment of water, waste water, or sewage by heating by distillation or evaporation using solar energy
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/447—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by membrane distillation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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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
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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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
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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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
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/138—Water desalination using renewable energy
- Y02A20/142—Solar thermal; Photovoltaics
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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
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
Abstract
The invention discloses a solution energy storage type seawater desalination system, which comprises a solution circulation subsystem and a thermal method seawater desalination subsystem; the solution circulation subsystem outputs heat energy to the thermal method seawater desalination subsystem in the energy storage and release processes so as to ensure that the thermal method seawater desalination subsystem continuously carries out seawater desalination. The invention can utilize the intermittent industrial low-level waste heat and the intermittent low-level heat source generated by solar energy to enable the thermal method seawater desalination subsystem to continuously carry out seawater desalination work, and has the advantages of low energy consumption cost and good economic benefit.
Description
Technical Field
The invention relates to the field of seawater desalination, in particular to a solution energy storage type seawater desalination system.
Background
The seawater desalination technology can extract fresh water from the seawater with huge reserves, and becomes an important way for solving the problem of fresh water shortage in many countries and regions. The total global production of desalinated water has currently exceeded 9000 ten thousand tons/day and is continuing to increase. However, the high desalination cost seriously restricts the growth speed of the desalination industrial scale, so that the open source incremental technology of the fresh water can not play the due role. The cost of seawater desalination mainly comprises investment cost, energy consumption cost, maintenance cost, labor cost and the like, wherein the investment cost and the energy consumption cost respectively account for more than 55% and 30% of the total cost. Because the reduction space of the investment cost is limited, the reduction of the energy consumption cost is a necessary way for reducing the seawater desalination cost.
Disclosure of Invention
The invention aims to provide a solution energy storage type seawater desalination system which is low in energy consumption cost and good in economic efficiency.
In order to achieve the above purpose, the solution of the invention is:
a solution energy storage type seawater desalination system comprises a solution circulation subsystem and a thermal method seawater desalination subsystem; the solution circulation subsystem comprises a generator, an absorber, a concentrated solution tank for containing concentrated energy storage solution with higher concentration and a dilute solution tank for containing dilute energy storage solution with lower concentration; the generator comprises a generator body and a generator coil, and the upper part and the lower part of the inner cavity of the generator body form a generator steam space and a generator solution space which are communicated with each other respectively; the generator coil is arranged in the generator solution space, and an inlet of the generator coil is used for inputting an external driving heat source; the generator solution space is connected with the dilute solution tank through a first liquid inlet pipe, the first liquid inlet pipe is provided with a first liquid inlet pump and a first liquid inlet valve, the generator solution space is also connected with the concentrated solution tank through a first liquid outlet pipe, and the first liquid outlet pipe is provided with a first liquid outlet valve; the absorber comprises an absorber body and an absorber coil, wherein the upper part and the lower part of the inner cavity of the absorber body form an absorber steam space and an absorber solution space which are communicated with each other respectively, and the absorber coil is arranged in the middle of the inner cavity of the absorber body; the absorber steam space is connected with the concentrated solution tank through a second liquid inlet pipe, the second liquid inlet pipe is provided with a second liquid inlet pump and a second liquid inlet valve, the absorber solution space is connected with the dilute solution tank through a second liquid outlet pipe, and the second liquid outlet pipe is provided with a second liquid outlet valve; a steam inlet of the thermal method seawater desalination subsystem is respectively connected with a steam space of the generator and an outlet of the absorber coil pipe through a first steam input pipe and a second steam input pipe; the first steam input pipe and the second steam input pipe are respectively provided with a first steam input valve and a second steam input valve; a condensed water outlet of the thermal method seawater desalination subsystem is connected with an inlet of the absorber coil pipe through a water outlet pipe, and a water outlet pump and a water outlet valve are arranged on the water outlet pipe; and a steam outlet of the hot method seawater desalination subsystem is connected with the steam space of the absorber through a steam output pipe, and the steam output pipe is provided with a steam output valve.
The concentrated solution tank is arranged below the generator, and the upper part of the concentrated solution tank is connected with the steam space of the generator through a first pressure equalizing pipe; the first pressure equalizing pipe is provided with a first pressure equalizing valve.
The dilute solution tank is arranged below the absorber, and the upper part of the dilute solution tank is connected with the vapor space of the absorber through a second pressure equalizing pipe; and the second pressure equalizing pipe is provided with a second pressure equalizing valve.
The solution space of the generator is connected with the steam space of the absorber through a third liquid outlet pipe; the third liquid outlet pipe is provided with a third liquid outlet pump and a third liquid outlet valve.
The generator solution space is connected with the absorber solution space through a third liquid inlet pipe, and the third liquid inlet pipe is provided with a third liquid inlet pump and a third liquid inlet valve.
The thermal method seawater desalination subsystem is a single-stage flash evaporation seawater desalination system or a multi-stage flash evaporation seawater desalination system or a single-effect evaporation seawater desalination system or a multi-effect evaporation seawater desalination system or a single-stage membrane distillation seawater desalination system or a multi-stage membrane distillation seawater desalination system.
The energy storage solution adopts a solution with water as a solvent and a nonvolatile substance as a solute. After the scheme is adopted, the seawater desalination system can be provided with four working modes, wherein in the first working mode, an external driving heat source is input into the generator, the solution circulation subsystem stores energy, and the generator outputs first heating steam to the heat method seawater desalination subsystem; in a second working mode, an external driving heat source is input into the generator, the solution circulation subsystem stores energy, the generator outputs first heating steam to the heat method seawater desalination subsystem, and the absorber outputs second heating steam to the heat method seawater desalination subsystem; in a third working mode, an external driving heat source is input into the generator, the solution circulating subsystem releases energy, the generator outputs first heating steam to the heat method seawater desalination subsystem, and the absorber outputs second heating steam to the heat method seawater desalination subsystem; in the fourth working mode, no external driving heat source is input into the generator, the solution circulation subsystem releases energy, and the absorber outputs second heating steam to the heat method seawater desalination subsystem.
From the above, the solution circulation subsystem of the invention can continuously provide a working heat source for the heat method seawater desalination subsystem under the condition that an external driving heat source is intermittently input, namely, under the condition that the solution circulation subsystem is connected with an external intermittent low-level heat source (such as hot water or flue gas with the temperature of more than 100 ℃ and steam with the pressure of more than 0.1 MPa), the invention can ensure that the heat method seawater desalination subsystem continuously carries out seawater desalination; therefore, the invention can effectively utilize the intermittent industrial low-level waste heat and the intermittent low-level heat source generated by solar energy to continuously desalt the seawater, thereby reducing the energy consumption cost and having good economic benefit.
Drawings
FIG. 1 is a schematic structural view of the present invention;
description of reference numerals:
the solution circulation subsystem A is connected with the solution circulation subsystem,
absorber 2, absorber body 21, absorber vapor space 211, absorber solution space 212, absorber coil 22,
the concentrated solution tank 3, the first pressure equalizing pipe 31, the first pressure equalizing valve 311,
a dilute solution tank 4, a second pressure equalizing pipe 41, a second pressure equalizing valve 411,
a first liquid inlet pipe 51, a first liquid inlet pump 511, a first liquid inlet valve 512,
a second liquid inlet pipe 52, a second liquid inlet pump 521, a second liquid inlet valve 522,
a third liquid inlet pipe 53, a third liquid inlet pump 531, a third liquid inlet valve 532,
a first liquid outlet pipe 61, a first liquid outlet valve 611,
a second liquid outlet pipe 62, a second liquid outlet valve 621,
a third liquid outlet pipe 63, a third liquid outlet pump 631, a third liquid outlet valve 632,
a first steam input pipe 71, a first steam input valve 711,
a second steam input pipe 72, a second steam input valve 721,
a steam output pipe 73, a steam output valve 731,
a water outlet pipe 8, a water outlet pump 81, a water outlet valve 82,
the system comprises a hot seawater desalination subsystem B, a steam inlet B1, a condensed water outlet B2 and a steam outlet B3.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
As shown in fig. 1, the present invention discloses a solution energy storage type seawater desalination system, which comprises a solution circulation subsystem a and a thermal method seawater desalination subsystem B; the solution circulation subsystem A is used for storing and releasing energy of the solution and providing a continuous heat source for the thermal method seawater desalination subsystem B so as to provide a working heat source required by the thermal method seawater desalination subsystem B for working.
As shown in fig. 1, the solution circulation subsystem a includes a generator 1, an absorber 2, a concentrated solution tank 3, and a dilute solution tank 4; the generator 1 is used for concentrating and regenerating a dilute energy storage solution with a relatively low concentration into a concentrated energy storage solution with a relatively high concentration by utilizing an external driving heat source, and simultaneously providing first heating steam for the thermal method seawater desalination subsystem B, wherein the first heating steam is used as a working heat source of the thermal method seawater desalination subsystem B; the absorber 2 absorbs part of secondary steam generated by the thermal seawater desalination subsystem B by using a concentrated energy storage solution so as to convert the concentrated energy storage solution into a dilute energy storage solution; the absorber 2 also utilizes the concentrated energy storage solution to absorb the heat released in the secondary steam process to produce second heating steam, and the second heating steam is also used as a working heat source of the thermal method seawater desalination subsystem B; the energy storage solution may be a solution with water as a solvent and a non-volatile substance as a solute, typically a solute such as lithium bromide, lithium chloride, calcium chloride, zinc chloride, and the like, as well as two-component or three-component mixtures thereof. The solution circulation subsystem A of the invention is very suitable for being combined with the hot seawater desalination subsystem B, because: firstly, the solution circulation subsystem A is driven by an intermittent external driving heat source to provide a continuous heat source for the thermal seawater desalination subsystem B, wherein the latent heat is released in both the energy storage process and the energy release process of the solution circulation subsystem A; secondly, the heat provided by the energy storage and release processes of the solution circulation subsystem A is related to the recycling of system energy, so that the energy utilization rate can be improved, and the energy consumption cost of seawater desalination can be further reduced; thirdly, the energy storage solution adopted by the solution circulation subsystem A can be selected from a solution taking water as a solvent, and the energy storage and release processes of the solution circulation subsystem A and the seawater desalination process of the thermal method seawater desalination subsystem B both contain the same working medium, namely water, so that the solution circulation subsystem A and the thermal method seawater desalination subsystem B are favorably organically coupled to form a high-efficiency integrated system.
As shown in fig. 1, specifically, the generator 1 includes a generator body 11 and a generator coil 12, the upper part and the lower part of the inner cavity of the generator body 11 respectively form a generator steam space 111 and a generator solution space 112 which are communicated with each other, and the generator solution space is used for containing an energy storage solution; the generator coil 12 is arranged in the generator solution space, an inlet of the generator coil 12 is used for inputting an external driving heat source, and the external driving heat source can be steam, hot water or flue gas from industrial waste heat, and can also be steam, hot water or the like heated by solar energy; the generator solution space 112 is connected with the dilute solution tank 4 through a first liquid inlet pipe 51, the first liquid inlet pipe 51 is provided with a first liquid inlet pump 511, the first liquid inlet pump 511 is used for pumping the dilute energy storage solution in the dilute solution tank 4 into the generator solution space 112, and the first liquid inlet pipe 51 is provided with a first liquid inlet valve 512 for controlling the on-off of the first liquid inlet pipe 51; the generator solution space 112 is further connected to the concentrated solution tank 3 through a first liquid outlet pipe 61, so that the concentrated energy storage solution generated in the generator 1 can be input into the concentrated solution tank 3 for storage, and the first liquid outlet pipe 61 is provided with a first liquid outlet valve 611 to control the on-off of the first liquid outlet pipe 61. As shown in fig. 1, the concentrated solution tank 3 is disposed below the generator 1, and the upper portion of the concentrated solution tank 3 is connected to the generator steam space 111 through a first pressure equalizing pipe 31, so that the upper portion of the concentrated solution tank 3 and the generator steam space 111 have the same pressure, and thus the concentrated energy storage solution generated in the generator 1 can smoothly flow into the concentrated solution tank 3; the first pressure equalizing pipe 31 is provided with a first pressure equalizing valve 311, and the first pressure equalizing valve 311 controls the on-off of the first pressure equalizing pipe 31.
As shown in fig. 1, the absorber 2 includes an absorber body 21 and an absorber coil 22, the upper part and the lower part of the inner cavity of the absorber body 21 form an absorber vapor space 211 and an absorber solution space 212 which are communicated with each other, respectively, and the absorber coil 22 is arranged in the middle of the inner cavity of the absorber body 21; the absorber steam space 211 is connected with the concentrated solution tank 3 through a second liquid inlet pipe 52, the second liquid inlet pipe 52 is provided with a second liquid inlet pump 521, the second liquid inlet pump 521 is used for pumping the concentrated energy storage solution in the concentrated solution tank 3 into the absorber steam space 211, the second liquid inlet pipe 52 is provided with a second liquid inlet valve 522 for controlling the on-off of the second liquid inlet pipe 52, the absorber solution space 212 is connected with the dilute solution tank 4 through a second liquid outlet pipe 62, so that the dilute energy storage solution generated in the absorber 2 can be input into the dilute solution tank 4 for storage, and the second liquid outlet pipe 62 is provided with a second liquid outlet valve 621 for controlling the on-off of the second liquid outlet pipe 62. As shown in fig. 1, the dilute solution tank 4 is disposed below the absorber 2, and the upper portion of the dilute solution tank 4 is connected to the absorber vapor space 211 through a second pressure equalizing pipe 41, so that the upper portion of the dilute solution tank 4 and the absorber vapor space 211 have the same pressure, and thus the dilute energy storage solution generated in the absorber 2 can smoothly flow into the dilute solution tank 4; the second pressure equalizing pipe 41 is provided with a second pressure equalizing valve 411, and the second pressure equalizing valve 411 controls the on-off of the second pressure equalizing pipe 41.
As shown in fig. 1, the generator solution space 112 of the generator 1 may be connected to the absorber vapor space 211 of the absorber 2 through a third liquid outlet pipe 63, the third liquid outlet pipe 63 is provided with a third liquid outlet pump 631, the third liquid outlet pump 631 is configured to pump the concentrated energy storage solution generated in the generator 1 into the absorber vapor space 211, and the third liquid outlet pipe 63 is provided with a third liquid outlet valve 632 to control on/off of the third liquid outlet pipe 63; the generator solution space 112 of the generator 1 may be further connected to the absorber solution space 212 of the absorber 2 through a third liquid inlet pipe 53, the third liquid inlet pipe 53 is provided with a third liquid inlet pump 531, the third liquid inlet pump 531 is configured to pump the dilute energy storage solution generated in the absorber 2 into the generator solution space 212, and the third liquid inlet pipe 53 is provided with a third liquid inlet valve 532 to control the on/off of the third liquid inlet pipe 53.
As shown in fig. 1, a steam inlet B1 of the thermal method seawater desalination subsystem B is connected to the generator steam space 111 through a first steam input pipe 71, so that first heating steam generated in the generator 1 can be input into the thermal method seawater desalination subsystem B to be used as a working heat source of the thermal method seawater desalination subsystem B, and the first steam input pipe 71 is provided with a first steam input valve 711 to control the on-off of the first steam input pipe 71; a steam outlet B3 of the thermal method seawater desalination subsystem B is connected with the absorber steam space 211 through a steam output pipe 73, a steam outlet B3 of the thermal method seawater desalination subsystem B is used for outputting part of secondary steam generated in the seawater desalination process of the thermal method seawater desalination subsystem B, the steam output pipe 73 is provided with a steam output valve 731 for controlling the on-off of the steam output pipe 73, part of the secondary steam generated in the seawater desalination process of the thermal method seawater desalination subsystem B is absorbed by concentrated energy storage solution entering the absorber steam space 211 after being input into the absorber steam space 211, and heat released in the process of absorbing the secondary steam by the concentrated energy storage solution heats the absorber coil 22; a condensed water outlet B2 of the hot method seawater desalination subsystem B is connected with an inlet of the absorber coil 22 through a water outlet pipe 8, a condensed water outlet B2 of the hot method seawater desalination subsystem B is used for outputting condensed water generated in the seawater desalination process of the hot method seawater desalination subsystem B, a water outlet pump 81 is arranged on the water outlet pipe 8, the water outlet pump 81 is used for pumping the condensed water generated by the hot method seawater desalination subsystem B into the absorber coil 22, the condensed water pumped into the absorber coil 22 can be vaporized in the absorber coil 22 to form second heating steam, and the water outlet pipe 8 is provided with a water outlet valve 82 for controlling the on-off of the water outlet pipe 8; and a steam inlet B1 of the thermal method seawater desalination subsystem B is connected with an outlet of the absorber coil 22 through a second steam input pipe 72, so that second heating steam generated by the absorber 2 can be input into the thermal method seawater desalination subsystem B as a working heat source of the thermal method seawater desalination subsystem B, and the second steam input pipe 72 is provided with a second steam input valve 721 for controlling the on-off of the second steam input pipe 72. The thermal method seawater desalination subsystem B can select one of a single-stage flash evaporation seawater desalination system, a multi-stage flash evaporation seawater desalination system, a single-effect evaporation seawater desalination system, a multi-effect evaporation seawater desalination system, a single-stage membrane distillation seawater desalination system and a multi-stage membrane distillation seawater desalination system according to requirements. As shown in fig. 1, the thermal method seawater desalination subsystem B can adopt a low-temperature multi-effect evaporation seawater desalination system, and the working principle and process of the low-temperature multi-effect evaporation seawater desalination are not described herein; wherein the inlet of the heating steam coil of the first effect evaporator B01 of the low-temperature multi-effect evaporation seawater desalination system is the steam inlet B1 of the thermal method seawater desalination subsystem B; the outlet of the heating steam coil of the first-effect evaporator B01 is a condensed water outlet B2 of the thermal seawater desalination subsystem; the upper steam space of the last evaporator B02 of the low-temperature multi-effect evaporation seawater desalination system is provided with a steam outlet B3 of the thermal method seawater desalination subsystem B.
The solution energy storage type seawater desalination system can be set into the following four working modes:
the first mode of operation: the first pressure equalizing valve 311, the first liquid inlet valve 512, the first liquid outlet valve 611 and the first steam input valve 711 are opened; the second pressure equalizing valve 411, the second liquid inlet valve 522, the third liquid inlet valve 532, the second liquid outlet valve 621, the third liquid outlet valve 632, the second steam input valve 721, the steam output valve 731 and the water outlet valve 82 are closed; an external driving heat source is input into the generator coil 12, the first liquid inlet pump 511 works to pump the dilute energy storage solution stored in the dilute solution tank 4 into the generator solution space 112 of the generator 1, and the second liquid inlet pump 521, the third liquid inlet pump 531 and the third liquid outlet pump 631 do not work; at this time, under the action of an external driving heat source in the generator coil 12, the dilute energy storage solution in the generator solution space 112 is heated and partially vaporized, so as to generate a concentrated energy storage solution and first heating steam, wherein the concentrated energy storage solution generated in the generator 1 is completely input into the concentrated solution tank 3 for storage, and the first heating steam generated in the generator 1 enters the thermal method seawater desalination subsystem B through the first steam input pipe 71, so as to drive the thermal method seawater desalination subsystem B to perform a seawater desalination process. In a first working mode, the solution circulation subsystem A is in an energy storage state, and first heating steam generated in the generator 1 is output as a working heat source of the thermal method seawater desalination subsystem B.
The second working mode is as follows: the first pressure equalizing valve 311, the first liquid inlet valve 512, the first liquid outlet valve 611, the third liquid inlet valve 532, the third liquid outlet valve 632, the first steam input valve 711, the second steam input valve 721, the steam output valve 731 and the water outlet valve 82 are opened; the second pressure equalizing valve 411, the second liquid inlet valve 522 and the second liquid outlet valve 621 are closed; an external driving heat source is input into the generator coil 12, the first liquid inlet pump 511 works to pump the dilute energy storage solution stored in the dilute solution tank 4 into the generator solution space 112 of the generator 1, the third liquid inlet pump 531 works to enable the dilute energy storage solution generated in the absorber 2 to be pumped into the generator solution space 112 of the generator 1, at this time, under the action of the driving heat source in the generator coil 12, the dilute energy storage solution entering into the generator solution space 112 is heated and partially vaporized to generate a concentrated energy storage solution and first heating steam, a part of the concentrated energy storage solution generated in the generator 1 is input into the concentrated solution tank 3 for storage, the other part of the concentrated energy storage solution is pumped into the absorber steam space 211 by the third liquid outlet pump 631, a part of secondary steam generated by the thermal seawater desalination subsystem B is also input into the absorber steam space 211, the water outlet pump 81 works to pump a part of the concentrated energy storage solution generated by the thermal seawater desalination subsystem B into the condensate water absorber coil 12, at this time, in the absorber 2, the concentrated energy storage solution entering the absorber vapor space 211 absorbs the secondary vapor to become a dilute energy storage solution, and the condensed water in the absorber coil 12 is heated by the heat released in the process of absorbing the secondary vapor by the concentrated energy storage solution, so that the condensed water in the absorber coil 12 is vaporized to form a second heating vapor; the first heating steam generated in the generator 1 and the second heating steam generated in the absorber 2 enter the thermal method seawater desalination subsystem B together to drive the thermal method seawater desalination subsystem B to carry out a seawater desalination process. In a second working mode, the solution circulation subsystem A is in an energy storage state, and simultaneously outputs first heating steam generated in the generator 1 and second heating steam generated in the absorber 2 as a working heat source of the thermal method seawater desalination subsystem B.
The third mode of operation: the second liquid inlet valve 522, the third liquid outlet valve 632, the third liquid inlet valve 532, the second pressure equalizing valve 411, the second liquid outlet valve 621, the first steam input valve 711, the second steam input valve 721, the steam output valve 731 and the water outlet valve 82 are opened; the first pressure equalizing valve 311, the first liquid outlet valve 611 and the first liquid inlet valve 512 are closed; an external driving heat source is input into the generator coil 12, the third liquid inlet pump 531 works to pump the dilute energy storage solution generated in the absorber 2 into the generator solution space 112 of the generator 1, and at this time, under the action of the driving heat source in the generator coil 12, the dilute energy storage solution entering the generator solution space 112 is heated and partially vaporized, so that a concentrated energy storage solution and first heating steam are generated; meanwhile, the second liquid inlet pump 521 works to pump the concentrated energy storage solution stored in the concentrated solution tank 3 into the absorber steam space 211, the third liquid outlet pump 631 works to pump the concentrated energy storage solution generated in the generator 1 into the absorber steam space 211, part of the secondary steam generated by the thermal seawater desalination subsystem B is also input into the absorber steam space 211, the water outlet pump 81 works to pump part of the condensed water generated by the thermal seawater desalination subsystem B into the absorber coil 12, at this time, in the absorber 2, the concentrated energy storage solution entering the absorber steam space 211 absorbs the secondary steam to become a dilute energy storage solution, a part of the dilute energy storage solution generated in the absorber 2 enters the generator 1, the other part of the dilute energy storage solution is input into the dilute solution tank 4 through the second liquid outlet pipe 62 to be stored, and the condensed water in the absorber coil 12 is heated by the heat released in the process that the concentrated energy storage solution absorbs the secondary steam, such that the condensed water in the absorber coil 12 vaporizes to form a second heating vapor; the first heating steam generated in the generator 1 and the second heating steam generated in the absorber 2 enter the thermal method seawater desalination subsystem B together, and the first heating steam and the second heating steam are used as working heat sources of the thermal method seawater desalination subsystem B together so as to drive the thermal method seawater desalination subsystem B to carry out a seawater desalination process. In the third working mode, the solution circulation subsystem A is in an energy release state, and the first heating steam generated in the generator 1 and the second heating steam generated in the absorber 2 are simultaneously output to be used as a working heat source of the thermal method seawater desalination subsystem B.
A fourth mode of operation: the second pressure equalizing valve 411, the second liquid inlet valve 522, the second liquid outlet valve 621, the second steam inlet valve 721, the steam outlet valve 731 and the water outlet valve 82 are opened; the first pressure equalizing valve 311, the first liquid inlet valve 512, the third liquid inlet valve 532, the first liquid outlet valve 611, the third liquid outlet valve 632 and the first steam input valve 711 are closed; no external driving heat source is input into the generator coil 12, the second liquid inlet pump 521 works to pump the concentrated energy storage solution stored in the concentrated solution tank 3 into the absorber steam space 211, part of secondary steam generated by the thermal seawater desalination subsystem B is also input into the absorber steam space 211, the water outlet pump 81 works to pump the condensed water generated by the thermal seawater desalination subsystem B into the absorber coil 12, at this time, in the absorber 2, the concentrated energy storage solution entering the absorber steam space 211 absorbs the secondary steam to become a dilute energy storage solution, and the condensed water in the absorber coil 12 is heated by the heat released in the process of absorbing the secondary steam by the concentrated energy storage solution, so that the condensed water in the absorber coil 12 is vaporized to form second heating steam; the dilute energy storage solution generated in the absorber 2 is input into the dilute solution tank 4 through the second liquid outlet pipe 62 for storage, and the second heating steam generated in the absorber 2 enters the thermal method seawater desalination subsystem B through the second steam input pipe 72 to drive the thermal method seawater desalination subsystem B to perform a seawater desalination process. In the fourth working mode, the solution circulation subsystem A is in an energy release state, and second heating steam generated in the absorber 2 is output as a working heat source of the thermal method seawater desalination subsystem B.
In summary, the solution energy storage type seawater desalination system of the present invention has the following advantages:
1. the solution circulation subsystem A can ensure that a working heat source is continuously provided for the heat method seawater desalination subsystem B under the condition of external driving heat source intermittent input, namely, the solution circulation subsystem A can ensure that the seawater desalination is continuously carried out under the condition of accessing an external intermittent low-level heat source (such as hot water with the temperature of more than 100 ℃, steam with the pressure of more than 0.1MPa, flue gas with the temperature of more than 100 ℃ and the like); therefore, the invention can effectively utilize the intermittent industrial low-level waste heat and the intermittent low-level heat source generated by solar energy to continuously desalt the seawater, thereby reducing the energy consumption cost and having good economic benefit.
2. According to the invention, through the selection of the working mode, the steam generated by the solution circulation subsystem A can be completely used as a working heat source of the thermal seawater desalination subsystem B, and the energy efficiency is high. It should be noted here that, in the four operation modes of the present invention, the first operation mode and the fourth operation mode are basic modes, and the solution circulation subsystem a of the present invention can continuously provide the working heat source for the thermal method seawater desalination subsystem B under the condition that the external driving heat source is intermittently input through the first operation mode and the fourth operation mode. The second and third operating modes are for maximum energy utilization, and the second or third operating mode may be used according to whether the external driving heat source is sufficient.
The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.
Claims (7)
1. A solution energy storage type seawater desalination system is characterized in that: comprises a solution circulation subsystem and a hot seawater desalination subsystem;
the solution circulation subsystem comprises a generator, an absorber, a concentrated solution tank for containing concentrated energy storage solution with higher concentration and a dilute solution tank for containing dilute energy storage solution with lower concentration;
the generator comprises a generator body and a generator coil, and the upper part and the lower part of the inner cavity of the generator body form a generator steam space and a generator solution space which are communicated with each other respectively; the generator coil is arranged in the generator solution space, and an inlet of the generator coil is used for inputting an external driving heat source; the generator solution space is connected with the dilute solution tank through a first liquid inlet pipe, the first liquid inlet pipe is provided with a first liquid inlet pump and a first liquid inlet valve, the generator solution space is also connected with the concentrated solution tank through a first liquid outlet pipe, and the first liquid outlet pipe is provided with a first liquid outlet valve;
the absorber comprises an absorber body and an absorber coil, wherein the upper part and the lower part of the inner cavity of the absorber body form an absorber steam space and an absorber solution space which are communicated with each other respectively, and the absorber coil is arranged in the middle of the inner cavity of the absorber body; the absorber steam space is connected with the concentrated solution tank through a second liquid inlet pipe, the second liquid inlet pipe is provided with a second liquid inlet pump and a second liquid inlet valve, the absorber solution space is connected with the dilute solution tank through a second liquid outlet pipe, and the second liquid outlet pipe is provided with a second liquid outlet valve;
a steam inlet of the thermal method seawater desalination subsystem is respectively connected with a steam space of the generator and an outlet of the absorber coil pipe through a first steam input pipe and a second steam input pipe; the first steam input pipe and the second steam input pipe are respectively provided with a first steam input valve and a second steam input valve; a condensed water outlet of the thermal method seawater desalination subsystem is connected with an inlet of the absorber coil pipe through a water outlet pipe, and a water outlet pump and a water outlet valve are arranged on the water outlet pipe; and a steam outlet of the hot method seawater desalination subsystem is connected with the steam space of the absorber through a steam output pipe, and the steam output pipe is provided with a steam output valve.
2. The solution energy storage type seawater desalination system of claim 1, wherein: the concentrated solution tank is arranged below the generator, and the upper part of the concentrated solution tank is connected with the steam space of the generator through a first pressure equalizing pipe; the first pressure equalizing pipe is provided with a first pressure equalizing valve.
3. The solution energy storage type seawater desalination system as defined in claim 1 or 2, wherein: the dilute solution tank is arranged below the absorber, and the upper part of the dilute solution tank is connected with the vapor space of the absorber through a second pressure equalizing pipe; and the second pressure equalizing pipe is provided with a second pressure equalizing valve.
4. The solution energy storage type seawater desalination system of claim 1, wherein: the solution space of the generator is connected with the steam space of the absorber through a third liquid outlet pipe; the third liquid outlet pipe is provided with a third liquid outlet pump and a third liquid outlet valve.
5. The solution energy storage type seawater desalination system as defined in claim 1 or 4, wherein: the generator solution space is connected with the absorber solution space through a third liquid inlet pipe, and the third liquid inlet pipe is provided with a third liquid inlet pump and a third liquid inlet valve.
6. The solution energy storage type seawater desalination system of claim 1, wherein: the thermal method seawater desalination subsystem is a single-stage flash evaporation seawater desalination system or a multi-stage flash evaporation seawater desalination system or a single-effect evaporation seawater desalination system or a multi-effect evaporation seawater desalination system or a single-stage membrane distillation seawater desalination system or a multi-stage membrane distillation seawater desalination system.
7. The solution energy storage type seawater desalination system of claim 1, wherein: the energy storage solution adopts a solution with water as a solvent and a nonvolatile substance as a solute.
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| DE102010035875B3 (en) * | 2010-08-30 | 2011-12-01 | Babcock Borsig Steinmüller Gmbh | System and process for the desalination of seawater |
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