CN107137944B - Moisture absorption solution regeneration system - Google Patents
Moisture absorption solution regeneration system Download PDFInfo
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- CN107137944B CN107137944B CN201710500815.XA CN201710500815A CN107137944B CN 107137944 B CN107137944 B CN 107137944B CN 201710500815 A CN201710500815 A CN 201710500815A CN 107137944 B CN107137944 B CN 107137944B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0082—Regulation; Control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0011—Heating features
- B01D1/0029—Use of radiation
- B01D1/0035—Solar energy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0094—Evaporating with forced circulation
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Abstract
The invention discloses a moisture absorption solution regeneration system which comprises a vacuum heat collection pipe, a solution tank, a return pipe, a liquid inlet valve, a liquid outlet valve and an exhaust valve. When the moisture absorption system is used, the steam exhaust valve and the liquid inlet valve are opened, and the moisture absorption solution enters the system from the liquid inlet valve; the vacuum heat collecting tube firstly heats the hygroscopic solution entering the vacuum heat collecting tube, and then the hygroscopic solution flows in a closed loop formed by the vacuum heat collecting tube, the solution tank and the return tube due to the density difference between the hygroscopic solution in the vacuum heat collecting tube and the unheated hygroscopic solution, so that the hygroscopic solution in the system is heated; meanwhile, steam generated during heating of the moisture absorption solution is discharged from the steam exhaust valve, the moisture absorption solution is finally regenerated, and the regenerated moisture absorption solution flows out of the liquid outlet valve and is recycled. The design of the moisture absorption solution regeneration system directly heats the moisture absorption solution by the vacuum heat collection tube, so that the intermediate link of a heat exchanger is saved, the heat exchange process is simplified, the heat exchange efficiency is improved, and the problem in the field at the present stage is solved.
Description
Technical Field
The invention relates to the field of solar heat utilization, in particular to a moisture absorption solution regeneration system.
Background
The hygroscopic solution, i.e. the dehumidifying solution, is widely applied in modern industry, agriculture and daily life, such as lithium bromide solution, lithium chloride solution and the like. The hygroscopic solution reduces the concentration of the hygroscopic solution while absorbing water to obtain a dilute solution of the hygroscopic solution; in actual life and production, in order to recycle the hygroscopic solution, a certain amount of energy needs to be consumed to evaporate the water absorbed by the hygroscopic solution, and the process is the regeneration of the hygroscopic solution.
The energy for regenerating the moisture absorption solution is usually provided by fossil fuel, industrial waste heat and solar energy, but in the actual production process, the solar energy is the best choice for regenerating the moisture absorption solution in consideration of factors such as economical efficiency, environmental protection, practicability and the like.
In the prior art, a solar heat collection system and a solution regeneration system for regenerating a hygroscopic solution are designed independently, and exchange of energy is realized between the solar heat collection system and the solution regeneration system through a heat exchanger, namely, a medium is heated in the solar heat collector and flows into the heat exchanger of the regeneration system to heat the hygroscopic solution and evaporate water of the hygroscopic solution, so that regeneration of the hygroscopic solution is completed. However, in the energy exchange process, the split design of the solar heat collection system and the solution regeneration system has to increase the heat exchange link of the intermediate medium, so that the heat exchange efficiency is reduced, and the full utilization of the heat energy is not facilitated.
Therefore, how to simplify the heat exchange process, improve the heat exchange efficiency of the regeneration of the moisture absorption solution and recycle is a difficult problem to be solved urgently in the field at the present stage.
Disclosure of Invention
In view of the above, the present invention provides a moisture absorption solution regeneration system, which simplifies the heat exchange process, improves the heat exchange efficiency, realizes the recycling of the moisture absorption solution, and solves the problem in the field at the present stage.
A hygroscopic solution regeneration system comprising:
a vacuum heat collecting tube;
the solution tank is connected with the vacuum heat collecting pipe and used for containing the moisture absorption solution, and an exhaust valve is arranged on the solution tank;
the return pipe, the one end of return pipe with evacuated collector tube links to each other, the other end with the solution tank links to each other, just evacuated collector tube the solution tank the return pipe can form the messenger moisture absorption solution flows closed circuit, just be equipped with on the closed circuit and be used for the inlet and the liquid outlet of moisture absorption solution business turn over, just the inlet with be equipped with feed liquor valve and play liquid valve on the liquid outlet respectively.
Preferably, the system for regenerating a hygroscopic solution further comprises:
the sensor is used for detecting the liquid level h of the hygroscopic solution in the solution tank;
the liquid level controller is preset with a minimum value a and a maximum value b of h and is in communication connection with the liquid inlet valve and the liquid outlet valve;
the time controller is preset with an automatic closing time value t and is in communication connection with the liquid level controller, the liquid inlet valve and the liquid outlet valve;
when h is less than or equal to a, the regeneration process is finished, the liquid level controller controls the liquid outlet valve to be opened, and the time controller is started; when the starting time of the time controller is equal to t, the time controller stops working, and controls the liquid outlet valve to be closed and the liquid inlet valve to be opened; and when h is larger than or equal to b, the liquid level controller controls the liquid inlet valve to be closed, and the regeneration process starts.
Preferably, in the moisture absorption solution regeneration system, the steam exhaust valve is arranged at the top end of the solution tank.
Preferably, the solution tank is higher than the vacuum heat collecting tube in vertical height of the hygroscopic solution regeneration system.
Preferably, the solution tank is higher than the return pipe in vertical height.
Preferably, in the hygroscopic solution regenerating system, the liquid inlet valve is disposed at the upper end of the return pipe.
Preferably, in the moisture absorption solution regeneration system, the liquid outlet valve is arranged at the lower end of the return pipe.
Preferably, in the moisture absorption solution regeneration system, the evacuated collector tube is a glass-metal evacuated collector tube.
Preferably, in the moisture absorption solution regeneration system, the evacuated solar collector tube is a straight evacuated solar collector tube.
The moisture absorption solution regeneration system comprises a vacuum heat collecting tube; the solution tank is connected with the vacuum heat collecting pipe and used for containing a moisture absorption solution, and an exhaust valve is arranged at the part of the solution tank, which is higher than the liquid level of the moisture absorption solution; the return pipe, the one end of return pipe with evacuated collector tube links to each other, the other end with the solution tank links to each other, just evacuated collector tube the solution tank the return pipe can form and make the closed circuit that moisture absorption solution flows, just be equipped with on the closed circuit and be used for control the feed liquor valve and the play liquid valve of moisture absorption solution business turn over. When the system is used, the steam exhaust valve and the liquid inlet valve are opened, the moisture absorption solution enters the system from the liquid inlet valve, and a loop is formed in the evacuated collector tube, the solution tank and the return tube; the vacuum heat collecting tube firstly heats the hygroscopic solution entering the vacuum heat collecting tube, and then the hygroscopic solution flows in a closed loop formed by the vacuum heat collecting tube, the solution tank and the return tube due to the density difference between the hygroscopic solution in the vacuum heat collecting tube and the unheated hygroscopic solution, so that the hygroscopic solution in the system is heated; meanwhile, steam generated during heating of the moisture absorption solution is discharged from the steam exhaust valve, the moisture absorption solution is finally regenerated, and the regenerated moisture absorption solution flows out of the liquid outlet valve and is recycled. This moisture absorption solution regeneration system's design directly makes evacuated collector tube heat the moisture absorption solution, has saved the intermediate link of heat exchanger, has simplified the heat transfer process, has improved heat exchange efficiency, has realized the cycle recycle of moisture absorption solution, has solved the difficult problem in this field at present stage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a hygroscopic solution regeneration system according to an embodiment of the present invention.
In fig. 1:
the system comprises a vacuum heat collecting pipe-1, a solution tank-2, a steam exhaust valve-3, a return pipe-4, a liquid inlet valve-5, a liquid outlet valve-6, a liquid level controller-7 and a time controller-8.
Detailed Description
The core of the embodiment lies in providing a moisture absorption solution regeneration system, which simplifies the heat exchange process, improves the heat exchange efficiency, realizes the recycling of the moisture absorption solution and solves the problem in the field at the present stage.
Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the contents of the invention described in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.
The system for regenerating a hygroscopic solution according to the present embodiment may include: a vacuum heat collecting pipe 1, a solution tank 2 and a return pipe 4. Wherein, the vacuum heat collecting tube 1 converts solar energy into heat energy and transmits the heat energy to the hygroscopic solution in the heat collecting tube; the solution tank 2 is used for containing the moisture absorption solution, and a steam exhaust valve 3 is arranged at the part of the solution tank 2 higher than the liquid level of the moisture absorption solution in the solution tank and used for exhausting water vapor generated in the regeneration process of the moisture absorption solution; one end of the return pipe 4 is connected with the vacuum heat collecting pipe 1, the other end is connected with the solution tank 2, the vacuum heat collecting pipe 1, the solution tank 2 and the return pipe 4 can form a closed loop, and the moisture absorption solution can naturally flow in the closed loop in the regeneration process; and, can also be equipped with inlet and outlet on this closed circuit, and be equipped with respectively on inlet and the outlet and be used for controlling the feed liquor valve 5 and the play liquid valve 6 of moisture absorption solution business turn over. Please refer to fig. 1 in detail.
When the moisture absorption solution regeneration system provided by the embodiment is used, the steam exhaust valve 3 and the liquid inlet valve 5 are opened, moisture absorption solution enters the system from the liquid inlet valve 5, and a loop is formed among the vacuum heat collecting tube 1, the solution tank 2 and the return pipe 4; the vacuum heat collecting tube 1 firstly heats the hygroscopic solution entering the vacuum heat collecting tube, and then the hygroscopic solution flows in a closed loop formed by the vacuum heat collecting tube 1, the solution tank 2 and the return tube 4 under the action of density difference between the hygroscopic solution in the vacuum heat collecting tube 1 and the unheated hygroscopic solution until the hygroscopic solution is heated; meanwhile, steam generated during heating of the moisture absorption solution is discharged from the steam exhaust valve 3, the moisture absorption solution is finally regenerated, and the regenerated moisture absorption solution flows out from the liquid outlet valve 6 and is recycled. This moisture absorption solution regeneration system's design directly makes evacuated collector tube 1 heat the moisture absorption solution, has saved the intermediate link of heat exchanger, has simplified the heat transfer process, has improved heat exchange efficiency, has realized the cycle recycle of moisture absorption solution, has solved the difficult problem in this field at present stage.
In order to improve the intelligence of the system and to smoothly realize regeneration and recirculation of the moisture absorption solution in a non-manual control state, the moisture absorption solution regeneration system provided in the present embodiment may further include a sensor, a liquid level controller 7, and a time controller 8. Wherein, the sensor is used for detecting the liquid level height of the hygroscopic solution in the solution tank 2, which can be expressed by h; the liquid level controller 7 is in communication connection with the sensor, the minimum value a and the maximum value b of h are preset, and the liquid level controller 7 is in communication connection with the liquid inlet valve 5 and the liquid outlet valve 6 and can control the opening and closing of the liquid inlet valve 5 and the liquid outlet valve 6; the time controller 8 is in communication connection with the liquid level controller 7, the liquid inlet valve 5 and the liquid outlet valve 6, can control the opening and closing of the liquid inlet valve 5 and the liquid outlet valve 6, and is preset with an automatic closing time value t.
In the moisture absorption solution regeneration system provided by the embodiment, in actual operation, when h is less than or equal to a, the regeneration process is finished, the liquid level controller 7 controls the liquid outlet valve 6 to be opened and the time controller 8 to be started, at this time, the moisture absorption solution is discharged from the liquid outlet valve 6, and the time controller 8 starts to time; when the opening time of the time controller 8 is equal to t, the time controller 8 automatically closes, and simultaneously controls the liquid outlet valve 6 to close and the liquid inlet valve 5 to open, at the moment, the regenerated hygroscopic solution is discharged completely, the hygroscopic solution to be regenerated enters the system from the liquid inlet valve 5, when h is more than or equal to b, the liquid level controller 7 controls the liquid inlet valve 5 to close, and the hygroscopic solution enters the regeneration link; and enters the next cycle period. According to the process, on the premise of no manual assistance, the moisture absorption solution regeneration system can independently complete the regeneration and recycling processes of the moisture absorption solution, and can automatically control the rhythm of the inlet and outlet of the moisture absorption solution according to the position of the liquid level; the design can meet the heat exchange of different sunlight radiations to the moisture absorption solution, and the intelligent automation is completely realized. Please refer to fig. 1 in detail.
In the moisture absorption solution regeneration system provided by the present embodiment, in order to smoothly discharge the water vapor generated in the moisture absorption solution regeneration process, the steam discharge valve 3 may be disposed at the top end of the solution tank 2; this arrangement fully satisfies the principle of gas rising and allows the water vapor to be discharged from the top end of the solution tank 2.
In order to further enable the moisture absorption solution entering the system to smoothly form a closed-cycle liquid flow and meet the principle that the hot solution rises and the cold solution falls, the moisture absorption solution regeneration system provided by the embodiment can arrange the evacuated collector tube 1 and the return tube 4 at the lower part of the solution tank 2, that is, the solution tank 2 is higher than the evacuated collector tube 1 and the return tube 4 in the vertical height, so that the moisture absorption solution in the system flows more smoothly.
In the moisture absorption solution regeneration system provided by the embodiment, in order to enable the sunlight to be orthogonal to the evacuated collector tube 1, namely, to form an included angle of 90 degrees, the sunlight is absorbed to the maximum extent; in the actual design, the vacuum heat collecting tube 1 can be specifically designed according to different use environments, for example, the included angle between the vacuum heat collecting tube 1 and the ground can be determined according to the local latitude, and the included angle between the vacuum heat collecting tube 1 and the ground is beneficial to be larger than the local latitude by about 10 degrees.
In the moisture absorption solution regeneration system provided by the embodiment, in order to facilitate the entry and the exit of the moisture absorption solution, the liquid inlet valve 5 and the liquid outlet valve 6 can be respectively arranged at the upper end and the lower end of the regeneration system; in the actual design, in order to avoid damaging the structures of the vacuum heat collecting tube 1 and the solution tank 2, the liquid inlet valve 5 and the liquid outlet valve 6 can be respectively arranged at the upper end and the lower end of the return pipe 4, so that the moisture absorption solution can smoothly flow into and out of the system.
In the moisture absorption solution regeneration system provided by the embodiment, in order to improve the heat exchange performance of the evacuated collector tube 1 and facilitate design, a straight-through glass-metal evacuated collector tube 1 can be selected; of course, in the actual design, other vacuum heat collecting pipes can be selected on the premise of playing the same role to provide energy for the regeneration of the moisture absorption solution.
In the moisture absorption solution regeneration system provided by this embodiment, the liquid inlet valve 5 and the liquid outlet valve 6 may be electromagnetic valves, and the exhaust valve 3 may be a mechanical valve or an electromagnetic valve.
The first embodiment is as follows:
based on the above moisture absorption solution regeneration system, a lithium bromide solution with the regeneration capacity of 12kg/h is designed to be used as the moisture absorption solution, and the temperature of the lithium bromide solution can reach 126 ℃ at most in the process of adopting 15 vacuum heat collecting tubes and increasing the concentration of the lithium bromide solution from 50% to 60%.
Example two:
based on the moisture absorption solution regeneration system, a lithium bromide solution with the regeneration capacity of 25kg/h is designed to be used as the moisture absorption solution, and in the process of adopting 30 vacuum heat collecting tubes and increasing the concentration of the lithium bromide solution from 50% to 60%, the temperature of the lithium bromide solution can reach 135 ℃ at most, the thermal efficiency of the system is about 57%, and under the condition of sufficient illumination, the lithium bromide solution which can be regenerated all day is about 150kg-200 kg.
Example three:
based on the moisture absorption solution regeneration system, a lithium chloride solution with the regeneration capacity of 50kg/h is designed to be used as the moisture absorption solution, and in the process of adopting 60 vacuum heat collecting tubes and increasing the concentration of the lithium chloride solution from 50% to 60%, the temperature of the lithium chloride solution can reach 132 ℃ at most, the thermal efficiency of the system is about 53%, and under the condition of sufficient illumination, the lithium chloride solution which can be regenerated all day is about 300kg-390 kg.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A hygroscopic solution regeneration system comprising:
a vacuum heat collecting tube (1);
the solution tank (2) is connected with the vacuum heat collecting tube (1) and used for containing a moisture absorption solution, and an exhaust valve (3) is arranged on the solution tank (2);
back flow (4), the one end of back flow (4) with evacuated collector tube (1) links to each other, the other end with solution tank (2) link to each other, just evacuated collector tube (1) solution tank (2) back flow (4) can form the messenger the closed circuit that moisture absorption solution flows, just be equipped with on the closed circuit and be used for the inlet and the liquid outlet of moisture absorption solution business turn over, just the inlet with be equipped with feed liquor valve (5) and play liquid valve (6) on the liquid outlet respectively.
2. The hygroscopic solution regeneration system of claim 1, further comprising:
the sensor is used for detecting the liquid level h of the hygroscopic solution in the solution tank (2);
the liquid level controller (7) is preset with a minimum value a and a maximum value b of h and is in communication connection with the liquid inlet valve (5) and the liquid outlet valve (6);
the time controller (8) is preset with an automatic closing time value t, and is in communication connection with the liquid level controller (7), the liquid inlet valve (5) and the liquid outlet valve (6);
when h is less than or equal to a, the regeneration process is finished, the liquid level controller (7) controls the liquid outlet valve (6) to be opened, and the time controller (8) is started; when the starting time of the time controller (8) is equal to t, the time controller (8) stops working, and controls the liquid outlet valve (6) to be closed and the liquid inlet valve (5) to be opened; and when h is larger than or equal to b, the liquid level controller (7) controls the liquid inlet valve (5) to be closed, and the regeneration process starts.
3. The hygroscopic solution regenerating system as claimed in claim 1, characterized in that said steam exhaust valve (3) is arranged at the top end of said solution tank (2).
4. Hygroscopic solution regenerating system as in claim 1, characterized by the fact that the solution tank (2) is higher than the evacuated collector tube (1) in vertical height.
5. Hygroscopic solution regenerating system according to claim 1, characterized in that the solution tank (2) is higher than the return pipe (4) in vertical height.
6. Hygroscopic solution regenerating system according to claim 1, characterized in that said inlet valve (5) is arranged at the upper end of said return pipe (4).
7. Absorbent solution regeneration system according to claim 1, characterized in that said outlet valve (6) is arranged at the lower end of said return pipe (4).
8. The hygroscopic solution regenerating system as claimed in claim 1, characterized in that said evacuated collector tubes (1) are glass-metal evacuated collector tubes (1).
9. The hygroscopic solution regenerating system as claimed in claim 1, characterized in that said evacuated collector tubes (1) are straight evacuated collector tubes (1).
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| CN201710500815.XA CN107137944B (en) | 2017-06-27 | 2017-06-27 | Moisture absorption solution regeneration system |
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| CN201710500815.XA CN107137944B (en) | 2017-06-27 | 2017-06-27 | Moisture absorption solution regeneration system |
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| CN107137944A CN107137944A (en) | 2017-09-08 |
| CN107137944B true CN107137944B (en) | 2020-04-28 |
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| CN2584262Y (en) * | 2002-12-09 | 2003-11-05 | 清华大学 | Device for regenerating absorption solution in liquid dehumidification system |
| CN202792619U (en) * | 2012-08-21 | 2013-03-13 | 武汉托普森能源有限公司 | Solar-powered water heating and solution concentrating device |
| CN106152594A (en) * | 2015-03-13 | 2016-11-23 | 广东工业大学 | A kind of lithium-bromide solution generator based on vacuum heat collection pipe |
| CN105753084B (en) * | 2016-05-01 | 2018-04-13 | 许玉蕊 | A kind of photo-thermal sea water by distillation desalting plant |
| CN106075943A (en) * | 2016-07-04 | 2016-11-09 | 江苏斯尔邦石化有限公司 | A kind of sulfur ammonium enrichment facility and the sulfur ammonium method for concentration of this device |
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