A heat source tower heat pump system with normal pressure and multi-effect regeneration

Abstract

The invention provides a heat source tower heat pump system with normal pressure multi-effect regeneration, comprising a heat source tower, a working system and an antifreeze regeneration system, wherein the working system comprises a solution circulation pump and a heat pump unit. The antifreeze regeneration system comprises a bypass valve, a solution pump, a filter, a regenerator, an air gap membrane distillation separator and a heater. After the antifreeze is processed by the system, the normal operation of the heat source tower is ensured. Compared with the traditional or existing antifreeze regeneration system, the technology is simple and easy to operate, making it more practical. At the same time, the system operates under normal pressure, is easy and simple to operate, saves costs and improves efficiency.

Description

Technical Field

[0001] The invention relates to the field of air conditioning and refrigeration, and in particular to a heat source tower heat pump system and method for normal pressure multi-effect regeneration. Background Art

[0002] Heat source tower heat pumps are widely used and have great energy-saving advantages. The main problem with heat source tower heat pumps at present is antifreeze regeneration. The usual antifreeze regeneration method not only greatly increases equipment investment, but also the unnecessary heating of ambient air during direct contact greatly increases the heat consumption of regeneration, and the regeneration efficiency is low, which greatly affects the overall performance of the heat source tower in the winter operation mode. Its practical value is difficult to compare with the existing air source heat pump, which makes the market promotion of heat source tower heat pump technology face more doubts and resistance.

[0003] The patent application with application number CN201410493728.2 proposes a regeneration scheme based on vacuum multi-effect distillation, which can realize the cascade utilization of regeneration heat, greatly improve the regeneration efficiency, and directly use the hot water produced by the heat pump unit to drive, without the need for an additional regeneration heat pump. However, this scheme needs to be operated under vacuum, and it is not easy to maintain the vacuum degree. In addition, the system is relatively complex, with many moving parts, and the operation and later maintenance are relatively cumbersome. Therefore, it is necessary to develop a simpler and easier heat source tower antifreeze regeneration technology based on the multi-effect regeneration technology to make it more practical. Summary of the invention

[0004] The purpose of the present invention is to provide a heat source tower heat pump system with normal pressure multi-effect regeneration, which solves the problem of antifreeze regeneration and simplifies the antifreeze regeneration process, thereby protecting the environment.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a heat source tower heat pump system with normal pressure multi-effect regeneration, comprising a heat source tower, which also includes a working system and an antifreeze regeneration system, the bottom liquid outlet of the heat source tower is connected to a first pipeline and a second pipeline, the first pipeline is connected to the working system, the second pipeline is connected to the antifreeze regeneration system, the working system includes a third pipeline, a solution circulation pump, and a heat pump unit, the solution circulation pump and the heat pump unit are sequentially connected to the third pipeline, the inlet end of the third pipeline is connected to the outlet end of the first pipeline, and the outlet end of the third pipeline is connected to the liquid inlet of the heat source tower; the antifreeze regeneration system includes a fourth pipeline, a bypass valve, a solution pump, a filter, a heat regenerator, an air gap membrane distillation separator, and a heater, the bypass valve, solution pump, filter, heat regenerator, air gap membrane distillation separator, and a heater are sequentially connected to the fourth pipeline, the outlet end of the second pipeline is connected to the inlet end of the fourth pipeline, the outlet end of the fourth pipeline is connected to the liquid inlet of the heat source tower, and the air gap membrane distillation separator is provided with a membrane hole.

[0006] Furthermore, a refrigerant is provided in the heat pump unit.

[0007] Beneficial effect: The present invention discloses a heat source tower heat pump system with normal pressure multi-effect regeneration, comprising a heat source tower, a working system and an antifreeze regeneration system, wherein the bottom liquid outlet of the heat source tower is connected to a first pipe and a second pipe, the first pipe is connected to the working system, the second pipe is connected to the antifreeze regeneration system, the working system comprises a third pipe, a solution circulation pump, and a heat pump unit, the solution circulation pump and the heat pump unit are sequentially connected to the third pipe, the inlet end of the third pipe is connected to the outlet end of the first pipe, the outlet end of the third pipe is connected to the liquid inlet of the heat source tower; the antifreeze regeneration system The production system includes a fourth pipeline, a bypass valve, a solution pump, a filter, a regenerator, an air gap membrane distillation separator, and a heater. The bypass valve, solution pump, filter, regenerator, air gap membrane distillation separator, and heater are connected to the fourth pipeline in sequence. The outlet end of the second pipeline is connected to the inlet end of the fourth pipeline, and the outlet end of the fourth pipeline is connected to the liquid inlet of the heat source tower. The air gap membrane distillation separator is provided with membrane holes. The heat source tower heat pump system of this structure is reasonably designed and has strong practicality. The system is simple to operate and can recycle the antifreeze solution, thereby saving costs and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the present invention.

[0009] Figure 2 It is a schematic diagram of the membrane pore structure of the present invention. DETAILED DESCRIPTION

[0010] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0011] As shown in the figure, a heat source tower heat pump system with normal pressure multi-effect regeneration includes a heat source tower 1, which also includes a working system and an antifreeze regeneration system. The bottom liquid outlet 12 of the heat source tower is connected to a first pipeline 13 and a second pipeline 14. The first pipeline 13 is connected to the working system, and the second pipeline 14 is connected to the antifreeze regeneration system. The working system includes a third pipeline 15, a solution circulation pump 2, and a heat pump unit 9. The circulation pump 2 and the heat pump unit 9 are sequentially connected to the third pipeline 15. The inlet end of the third pipeline 15 is connected to the outlet end of the first pipeline 13, and the outlet end of the third pipeline 15 is connected to the liquid inlet 11 of the heat source tower; the antifreeze regeneration system includes a fourth pipeline 16, a bypass valve 3, a solution pump 4, a filter 5, a regenerator 6, an air gap membrane distillation separator 7, and a heater 8. The bypass valve 3, the solution pump 4, the filter 5, the regenerator 6, the air gap membrane distillation separator 7, and the heater 8. The heat device 8 is connected to the fourth pipeline 16 in sequence, the outlet end of the second pipeline 14 is connected to the inlet end of the fourth pipeline 16, and the outlet end of the fourth pipeline 16 is connected to the liquid inlet 10 of the heat source tower. The air gap membrane distillation separator 7 is provided with a membrane hole 71, and the membrane hole 71 is an inverted cone-shaped component 72. A concave surface 73 is provided on the upper part of the conical component 72, and a plurality of guide pipes 74 are provided on the concave surface 73. The center line of the guide pipe 74 is perpendicular to the center line of the concave surface 73. The guide pipe 74 is made of plastic. The concave surface 73 is embedded on the bottom surface of the conical component 72. The concave surface 73 is made of plastic. When the working system is turned on, the antifreeze solution flows out from the liquid outlet 12 at the bottom of the heat source tower, passes through the first pipeline 13, the solution circulation pump 2, enters the third pipeline 15, and passes through the heat pump unit 9. Since the heat pump unit 9 is provided with a refrigerant, the temperature of the antifreeze solution is reduced, and the antifreeze liquid enters the liquid inlet 11 at the top of the heat source tower from the outlet of the third pipeline 15.

[0012] When the antifreeze regeneration system is turned on, the antifreeze flows out from the liquid outlet 12 at the bottom of the heat source tower, passes through the second pipeline 14, and then enters the filter 5 after passing through the bypass valve 3 and the solution pump 4. After the impurities contained in the antifreeze are filtered in the filter 5, the antifreeze enters the heat absorption channel of the regenerator 6, the temperature rises, and then enters the heat absorption channel of the air gap membrane distillation separator 7, the temperature further rises, and then enters the heat absorption channel of the heater 8, the temperature rises, and then enters the heat release channel of the air gap membrane distillation separator 7. A part of the antifreeze evaporates into water vapor in the air gap membrane distillation separator 7, and the water vapor passes through the membrane pores 71 on the air gap membrane distillation separator 7 and is discharged from the membrane pores 71. The temperature of the antifreeze flowing through the heat release channel of the air gap membrane distillation separator 7 decreases and the concentration increases. The antifreeze flowing out of the heat release channel of the air gap membrane distillation separator 7 enters the heat release channel of the regenerator 6, the temperature further decreases, and finally enters the liquid inlet 10 of the heat source tower from the outlet end of the fourth pipeline 16 and enters the heat source tower 1 for storage, completing the concentrated regeneration of the antifreeze solution. The membrane pore design is simple, which can prevent water accumulation from damaging the air gap membrane distillation separator 7, thereby affecting the operation of the entire system.

[0013] Performance indicators: for 1kw condensing heat exhaust, the heat pump heating COP is 2.5, the evaporator absorbs latent heat ratio of 30%, the absorbed latent heat is 180kw, the regeneration cycle ratio is 60, the system evaporator absorbs 600kw of heat, the separated water volume is 259kg / h, the system heat recovery loss and heating air heat consumption are 0, the total regeneration heat consumption is 130kw, the regeneration heat consumption is 130kw, and the overall COP of the heat pump system is 2.1.

[0014] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A heat source tower heat pump system with normal pressure multi-effect regeneration, comprising a heat source tower, characterized in that: It also includes a working system and an antifreeze regeneration system, the bottom liquid outlet of the heat source tower is connected to a first pipeline and a second pipeline, the first pipeline is connected to the working system, the second pipeline is connected to the antifreeze regeneration system, the working system includes a third pipeline, a solution circulation pump, and a heat pump unit, the solution circulation pump and the heat pump unit are sequentially connected to the third pipeline, the inlet end of the third pipeline is connected to the outlet end of the first pipeline, and the outlet end of the third pipeline is connected to the liquid inlet of the heat source tower; the antifreeze regeneration system includes a fourth pipeline, a bypass valve, a solution pump, a filter, a heat exchanger, an air gap membrane The distillation separator and the heater, the bypass valve, the solution pump, the filter, the heat regenerator, the air gap membrane distillation separator and the heater are sequentially connected to the fourth pipeline, the outlet end of the second pipeline is connected to the inlet end of the fourth pipeline, the outlet end of the fourth pipeline is connected to the liquid inlet of the heat source tower, and the air gap membrane distillation separator is provided with a membrane hole; the membrane hole is an inverted cone-shaped component, the upper part of the cone-shaped component is provided with a concave surface, and the concave surface is provided with a plurality of guide tubes, the center line of the guide tube is perpendicular to the center line of the concave surface, the guide tube is made of plastic, and the concave surface is embedded in the bottom surface of the cone-shaped component, and the concave surface is made of plastic.

2. A heat source tower heat pump system with normal pressure multi-effect regeneration according to claim 1, characterized in that: The heat pump unit is provided with a refrigerant.

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