CN111892110A - A solution energy storage type seawater desalination system - Google Patents

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

A solution energy storage type seawater desalination system

technical field

The invention relates to the field of seawater desalination, in particular to a solution energy storage type seawater desalination system.

Background technique

Seawater desalination technology can extract fresh water from seawater with huge reserves, and has become an important way to solve the problem of freshwater shortage in many countries and regions. At present, the total output of desalinated water in the world has exceeded 90 million tons per day, and it continues to grow. However, the high cost of desalination has seriously restricted the growth rate of the scale of the desalination industry, making this open source incremental technology for fresh water far from playing its due role. The cost of seawater desalination mainly includes investment cost, energy cost, maintenance cost, labor cost, etc., of which investment and energy cost account for more than 55% and 30% of the total cost respectively. Due to the limited space for reducing investment costs, reducing energy costs is the only way to reduce the cost of desalination.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a solution energy storage type seawater desalination system, which has low energy consumption cost and good economic performance.

In order to achieve the above-mentioned purpose, the solution of the present invention is:

A solution energy storage type seawater desalination system, which includes a solution circulation subsystem and a thermal seawater desalination subsystem; the solution circulation subsystem includes a generator, an absorber, and a concentrated energy storage solution for accommodating a higher concentration of energy storage solution. A solution tank and a dilute solution tank for accommodating a low-concentration dilute energy storage solution; the generator includes a generator body and a generator coil, and the upper and lower parts of the inner cavity of the generator body respectively form a generator steam space that communicates and the generator solution space; the generator coil is arranged in the generator solution space, and the inlet of the generator coil is used to input an external driving heat source; the generator solution space is connected with the dilute solution tank through the first liquid inlet pipe, and the second A 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, the upper part and the lower part of the inner cavity of the absorber body respectively form a connected absorber vapor space and an absorber solution space, and the absorber coil is arranged in the middle of the inner cavity of the absorber body; The vapor space of the absorber is connected to 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, and the absorber solution space is connected to the concentrated solution tank through the second liquid outlet pipe. The dilute solution tanks are connected to each other, and the second liquid outlet pipe is provided with a second liquid outlet valve; the steam inlet of the thermal seawater desalination subsystem is connected to the generator steam space and the absorber through the first steam input pipe and the second steam input pipe respectively. The outlet of the coil; 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; the condensed water outlet of the thermal seawater desalination subsystem is connected and absorbed through the water outlet pipe The inlet of the coil pipe and the outlet pipe are provided with an outlet pump and a water outlet valve; the steam outlet of the thermal seawater desalination subsystem is connected to 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 to 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 to the vapor space of the absorber through a second pressure equalizing pipe; the second pressure equalizing pipe is provided with a second pressure equalizing valve.

The generator solution space is connected with the absorber vapor space 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 seawater desalination subsystem is a single-stage flash seawater desalination system or a multi-stage flash 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 desalination system.

The energy storage solution adopts a solution with water as a solvent and a non-volatile substance as a solute. After the above scheme is adopted, the present invention can be provided with four working modes. In the first working mode, an external driving heat source is input to the generator, the solution circulation subsystem stores energy, and the generator outputs the first heating steam for heat supply. Seawater desalination subsystem; in the second working mode, an external drive heat source is input to the generator, the solution circulation subsystem stores energy, and the generator outputs the first heating steam to the thermal seawater desalination subsystem, and the absorber outputs the second heating Seawater desalination subsystem with steam feeding method; in the third working mode, an external driving heat source is input to the generator, the solution circulation subsystem releases energy, and the generator outputs the first heating steam to the hot seawater desalination subsystem and absorber The second heating steam is output to the thermal seawater desalination subsystem; in the fourth working mode, no external drive heat source is input to the generator, the solution circulation subsystem releases energy, and the absorber outputs the second heating steam to the thermal seawater desalination subsystem .

It can be seen from the above that the solution circulation subsystem of the present invention can continuously provide a working heat source to the thermal seawater desalination subsystem under the condition that the external driving heat source is intermittently input, that is, the solution circulation subsystem is connected to an external intermittent low-level heat source (such as 100 ℃). In the case of hot water above ℃ or flue gas, steam above 0.1MPa), the present invention can ensure continuous seawater desalination by the thermal seawater desalination subsystem; therefore, the present invention can effectively utilize intermittent industrial low-level waste heat and utilize solar energy The intermittent low-level heat source is used for continuous desalination of seawater, thereby reducing energy consumption costs and achieving good economic benefits.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Label description:

Solution Circulation Subsystem A,

Generator 1, generator body 11, generator steam space 111, generator solution space 112, generator coil 12,

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,

Dilute solution tank 4, second pressure equalizing pipe 41, second pressure equalizing valve 411,

The first liquid inlet pipe 51, the first liquid inlet pump 511, the first liquid inlet valve 512,

The second liquid inlet pipe 52, the second liquid inlet pump 521, the second liquid inlet valve 522,

The third liquid inlet pipe 53, the third liquid inlet pump 531, the third liquid inlet valve 532,

The first liquid outlet pipe 61, the first liquid outlet valve 611,

The second liquid outlet pipe 62, the second liquid outlet valve 621,

The third liquid outlet pipe 63, the third liquid outlet pump 631, the third liquid outlet valve 632,

The first steam input pipe 71, the first steam input valve 711,

The second steam input pipe 72, the second steam input valve 721,

Steam output pipe 73, steam output valve 731,

Outlet pipe 8, outlet pump 81, outlet valve 82,

Thermal seawater desalination subsystem B, steam inlet B1, condensate outlet B2, steam outlet B3.

Detailed ways

In order to further explain the technical solutions of the present invention, the present invention will be described in detail below through specific embodiments.

As shown in FIG. 1, the present invention discloses a solution energy storage type seawater desalination system, which includes a solution circulation subsystem A and a thermal seawater desalination subsystem B; wherein the solution circulation subsystem A is used for the energy storage, release of the solution energy, and provide a continuous heat source for the thermal seawater desalination subsystem B, so as to provide the thermal seawater desalination subsystem B with a working heat source required for its work.

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; wherein the generator 1 is used to use an external driving heat source to The dilute energy storage solution is concentrated and regenerated into a concentrated energy storage solution with a higher concentration, and at the same time, the first heating steam is provided for the thermal seawater desalination subsystem B, and the first heating steam is used as the working heat source of the thermal seawater desalination subsystem B; the The absorber 2 uses the concentrated energy storage solution to absorb part of the secondary steam generated by the thermal seawater desalination subsystem B, so as to convert the concentrated energy storage solution into a dilute energy storage solution; the absorber 2 also uses the concentrated energy storage solution to absorb The heat released in the secondary steam process is used to produce the second heating steam, and the second heating steam is also used as the working heat source of the thermal seawater desalination subsystem B; the energy storage solution can use water as a solvent and a non-volatile substance It is a solution of solutes, typical solutes such as lithium bromide, lithium chloride, calcium chloride, zinc chloride, etc. and their two-component or three-component mixtures. The solution circulation subsystem A of the present invention is very suitable to be combined with the thermal seawater desalination subsystem B, because: first, both the energy storage process and the energy release process of the solution circulation subsystem A are accompanied by the release of latent heat, Therefore, the solution circulation subsystem A can provide a continuous heat source for the thermal seawater desalination subsystem B under the driving of the intermittent external driving heat source; secondly, the energy storage and energy release process of the solution circulation subsystem A provides The heat is related to the recovery and utilization of the system energy, which can improve the energy utilization rate and further reduce the energy consumption cost of seawater desalination; The energy storage and energy release process of the solution circulation subsystem A and the seawater desalination process of the thermal seawater desalination subsystem B all contain the same working medium—water, which is beneficial to the integration of the solution circulation subsystem A and the thermal seawater desalination subsystem. B are organically coupled to form an efficient integrated system.

As shown in FIG. 1 , specifically, the generator 1 includes a generator body 11 and a generator coil 12 , and the upper and lower parts of the inner cavity of the generator body 11 respectively form a generator steam space 111 and a generator solution space that communicate with each other. 112, the generator solution space is used to accommodate the energy storage solution; the generator coil 12 is arranged in the generator solution space, and the inlet of the generator coil 12 is used to input an external driving heat source, and the external driving heat source can be derived from industrial waste heat Steam, hot water or flue gas, etc., can also be derived from steam, hot water, etc. heated by solar energy; the generator solution space 112 is connected to the dilute solution tank 4 through the first liquid inlet pipe 51, and the first liquid inlet pipe 51 A first liquid inlet pump 511 is provided. The first liquid inlet pump 511 is used to pump the dilute energy storage solution in the dilute solution tank 4 into the generator solution space 112. The first liquid inlet pipe 51 is provided with a first liquid inlet valve. 512 to control the on-off of the first liquid inlet pipe 51; the generator solution space 112 is also connected with the concentrated solution tank 3 through the first liquid outlet pipe 61, so that the concentrated energy storage solution generated in the generator 1 can be input into the concentrated solution. The solution is stored in the solution tank 3, 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. 1, the concentrated solution tank 3 is arranged below the generator 1, and the upper part of the concentrated solution tank 3 is connected with the generator steam space 111 through the first pressure equalizing pipe 31, so that the upper part of the concentrated solution tank 3 and the generator are connected The vapor space 111 has the same pressure, so that the concentrated energy storage solution generated in the generator 1 can smoothly flow into the concentrated solution tank 3; The pressure equalizing valve 311 is used to control 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 and lower parts of the inner cavity of the absorber body 21 respectively form a connected absorber vapor space 211 and an absorber solution space 212. The absorber coil 22 is arranged in the middle of the inner cavity of the absorber body 21; the absorber vapor space 211 is connected to the concentrated solution tank 3 through the second liquid inlet pipe 52, and the second liquid inlet pipe 52 is provided with a second liquid inlet pump 521, The second liquid inlet pump 521 is used to pump the concentrated energy storage solution in the concentrated solution tank 3 into the vapor space 211 of the absorber, and the second liquid inlet pipe 52 is provided with a second liquid inlet valve 522 to control the second liquid inlet pipe 52 The absorber solution space 212 is connected to the dilute solution tank 4 through the 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 A second liquid outlet valve 621 is provided to control the on-off of the second liquid outlet pipe 62 . As shown in FIG. 1 , the dilute solution tank 4 is arranged below the absorber 2, and the upper part of the dilute solution tank 4 is connected to the vapor space 211 of the absorber through the second pressure equalizing pipe 41, so that the upper part of the dilute solution tank 4 and the absorption The vapor space 211 of the absorber has the same pressure, so that 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, Two pressure equalizing valves 411 are used to control the on-off of the second pressure equalizing pipe 41 .

As shown in FIG. 1 , the generator solution space 112 of the generator 1 can be connected to the absorber vapor space 211 of the absorber 2 through the third liquid outlet pipe 63 , and the third liquid outlet pipe 63 is provided with a third liquid outlet pump 631, the third liquid outlet pump 631 is used 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 the third liquid outlet and the generator solution space 112 of the generator 1 can also be connected with the absorber solution space 212 of the absorber 2 through the third liquid inlet pipe 53, and the third liquid inlet pipe 53 is provided with a third inlet pipe. The liquid pump 531 and the third liquid inlet pump 531 are used 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 third liquid inlet valve 532. On/off of the liquid inlet pipe 53.

As shown in FIG. 1, the steam inlet B1 of the thermal seawater desalination subsystem B is connected to the generator steam space 111 through the first steam input pipe 71, so that the first heating steam generated in the generator 1 can be input into the thermal seawater In the desalination subsystem B, as the working heat source of the thermal seawater desalination subsystem B, 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; the thermal seawater desalination The steam outlet B3 of the subsystem B is connected to the steam space 211 of the absorber through the steam output pipe 73, and the steam outlet B3 of the thermal seawater desalination subsystem B is used to output the part II produced by the thermal seawater desalination subsystem B during the seawater desalination process. Secondary steam, the steam output pipe 73 is provided with a steam output valve 731 to control the on-off of the steam output pipe 73, and part of the secondary steam generated by the thermal seawater desalination subsystem B in the process of seawater desalination is input into the absorber steam space 211 and will be Absorbed by the concentrated energy storage solution entering the vapor space 211 of the absorber, the heat released in the process of absorbing the secondary steam by the concentrated energy storage solution will heat the absorber coil 22; the condensed water outlet B2 of the thermal seawater desalination subsystem B The inlet of the absorber coil 22 is connected through the water outlet pipe 8, and the condensed water outlet B2 of the thermal seawater desalination subsystem B is used to output the condensed water produced by the thermal seawater desalination subsystem B during the desalination process. An outlet pump 81 is provided, and the outlet pump 81 is used to pump the condensate generated by the thermal seawater desalination subsystem B into the absorber coil 22, and the condensate pumped into the absorber coil 22 can be vaporized in the absorber coil 22 to form For the second heating steam, the water outlet pipe 8 is provided with a water outlet valve 82 to control the on-off of the water outlet pipe 8; and the steam inlet B1 of the thermal seawater desalination subsystem B is connected to the outlet of the absorber coil 22 through the second steam input pipe 72, So that the second heating steam generated by the absorber 2 can be input into the thermal seawater desalination subsystem B as the working heat source of the thermal seawater desalination subsystem B, the second steam input pipe 72 is provided with a second steam input valve 721 to control the first steam. The on-off of the second steam input pipe 72. Wherein, the thermal seawater desalination subsystem B can be selected from a single-stage flash seawater desalination system, a multi-stage flash seawater desalination system, a single-effect evaporation seawater desalination system, a multi-effect evaporation seawater desalination system, and a single-stage membrane distillation seawater desalination system. One of the systems and multi-stage membrane distillation desalination systems. As shown in Figure 1, the thermal 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 repeated here; The inlet of the heating steam coil of the first effect evaporator B01 is the steam inlet B1 of the thermal seawater desalination subsystem B; and the outlet of the heating steam coil of the first effect evaporator B01 is the thermal seawater The condensed water outlet B2 of the desalination subsystem; the steam outlet B3 of the thermal seawater desalination subsystem B is provided in the upper steam space of the last effect evaporator B02 of the low-temperature multi-effect evaporation seawater desalination system.

A solution energy storage type seawater desalination system of the present invention can be set to the following four working modes:

The first working mode: 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 first The three 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; the external driving heat source is input into the generator coil 12, the first The 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 second liquid inlet pump 521, the third liquid inlet pump 531 and the third liquid outlet pump 631 does not work; at this time, under the action of the 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, thereby producing a concentrated energy storage solution and a first heating steam, wherein The concentrated energy storage solution generated in the generator 1 is all input into the concentrated solution tank 3 for storage, and the first heating steam generated in the generator 1 enters the thermal seawater desalination subsystem B through the first steam input pipe 71 to drive the The thermal seawater desalination subsystem B performs the seawater desalination process. In the first working mode of the present invention, the solution circulation subsystem A is in an energy storage state, and at the same time, the first heating steam generated in the generator 1 is output as the working heat source of the thermal seawater desalination subsystem B.

The second working mode: 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 The 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; the external drive heat source is input into the generator coil 12, the first The feed 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 third feed pump 531 works to make the dilute energy storage solution generated in the absorber 2 It can 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 the generator solution space 112 is heated up and partially vaporized, thereby producing a concentrated solution. The energy storage solution and the 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, and the other part is pumped into the absorber steam space 211 by the third liquid outlet pump 631, and the thermal seawater desalination is carried out. Part of the secondary steam generated by the subsystem B is also input into the absorber steam space 211, and the effluent pump 81 works to pump part of the condensate generated by the thermal seawater desalination subsystem B into the absorber coil 12. At this time, in the absorber 2 Inside, the concentrated energy storage solution entering the absorber vapor space 211 absorbs the secondary steam and becomes a dilute energy storage solution, and the heat released during the absorption process of the concentrated energy storage solution absorbing the secondary steam will heat the condensation in the absorber coil 12 water, so that the condensed water in the absorber coil 12 is vaporized to form the second heating steam; the first heating steam generated in the generator 1 and the second heating steam generated in the absorber 2 enter the thermal desalinator together In the system B, the thermal seawater desalination subsystem B is driven to carry out the seawater desalination process. In the second working mode of the present invention, the solution circulation subsystem A is in an energy storage state, and at the same time, the first heating steam generated in the generator 1 and the second heating steam generated in the absorber 2 are output as thermal desalination sub-systems. The working heat source of system B, the second working mode of the present invention is suitable for the situation that the external driving heat source is sufficient.

The third working mode: 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 The 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; the external driving heat source is input into the generator coil 12, the third The liquid feed 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. At this time, under the action of the driving heat source in the generator coil 12, it enters the generator solution The dilute energy storage solution in the space 112 is heated up and partially vaporized, thereby producing a concentrated energy storage solution and a first heating steam; at the same time, the second liquid feed 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, and part of the secondary steam generated by the thermal seawater desalination subsystem B Into the absorber steam space 211, the outlet pump 81 works to pump part of the condensate generated by the thermal seawater desalination subsystem B into the absorber coil 12. At this time, in the absorber 2, the concentrated water entering the absorber steam space 211 is pumped. The energy storage solution absorbs the secondary steam and becomes a dilute energy storage solution, a part of the dilute energy storage solution generated in the absorber 2 enters the generator 1, and the other part is input into the dilute solution tank 4 through the second liquid outlet pipe 62 for storage, while the concentrated solution is stored in the dilute solution tank 4. The heat released in the process of absorbing the secondary steam by the energy storage solution will heat the condensed water in the absorber coil 12, so that the condensed water in the absorber coil 12 is vaporized to form the second heating steam; the first heating steam generated in the generator 1 The heating steam and the second heating steam generated in the absorber 2 enter into the thermal seawater desalination subsystem B together, and the first heating steam and the second heating steam together serve as the working heat source of the thermal seawater desalination subsystem B to drive the thermal seawater desalination subsystem B. The thermal seawater desalination subsystem B performs the seawater desalination process. In the third working mode of the present invention, the solution circulation subsystem A is in a state of releasing energy, and at the same time, the first heating steam generated in the generator 1 and the second heating steam generated in the absorber 2 are output as thermal desalination sub-systems. The working heat source of system B, the third working mode of the present invention is suitable for the situation that the external driving heat source is insufficient.

The fourth working mode: the second pressure equalizing valve 411, the second liquid inlet valve 522, the second liquid outlet valve 621, 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 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 first liquid The secondary liquid pump 521 works to pump the concentrated energy storage solution stored in the concentrated solution tank 3 into the absorber steam space 211, and part of the secondary steam generated by the thermal seawater desalination subsystem B is also input into the absorber steam space 211, The outlet water pump 81 works to pump the condensate 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 The heat released during the absorption of the secondary steam by the dilute energy storage solution and the concentrated energy storage solution will heat the condensed water in the absorber coil 12, so that the condensed water in the absorber coil 12 is vaporized to form the 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, while the second heating steam generated in the absorber 2 enters the thermal seawater desalinator through the second steam input pipe 72. In the system B, the thermal seawater desalination subsystem B is driven to carry out the seawater desalination process. In the fourth working mode of the present invention, the solution circulation subsystem A is in the energy release state, and at the same time, the second heating steam generated in the absorber 2 is output as the working heat source of the thermal seawater desalination subsystem B.

To sum up, the solution energy storage type seawater desalination system of the present invention has the following advantages:

1. The solution circulation subsystem A of the present invention can ensure continuous supply of working heat source to the thermal seawater desalination subsystem B under the condition of intermittent input of external driving heat source, that is, when the external intermittent low-level heat source (such as heat above 100°C) is connected. In the case of water, steam above 0.1MPa, flue gas above 100°C, etc.), the present invention can ensure continuous seawater desalination; so that the present invention can effectively utilize intermittent industrial low-level waste heat and intermittent low-level heat sources generated by solar energy. To continuously desalinate seawater, so as to reduce energy consumption costs and achieve good economic benefits.

2. The present invention can make all the steam generated by the solution circulation subsystem A be used as the working heat source of the thermal seawater desalination subsystem B through the selection of the working mode, and the energy efficiency is high. It should be noted here that, among the four working modes of the present invention, the first working mode and the fourth working mode are the basic modes, and the first working mode and the fourth working mode can realize the operation of the present invention. The solution circulation subsystem A continuously provides a working heat source to the thermal seawater desalination subsystem B under the condition of intermittent input of an external driving heat source. The second working mode and the third working mode are to maximize the utilization of energy. When to use the second working mode or the third working mode can be determined according to whether the external driving heat source is sufficient.

The above-mentioned embodiments and drawings do not limit the product form and style of the present invention, and any appropriate changes or modifications made by those of ordinary skill in the art should be regarded 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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