Rectification and regeneration device for heat source tower antifreeze solution

Abstract

The invention discloses a distillation regeneration device of a heat source tower antifreeze solution. The distillation regeneration device of the heat source tower antifreeze solution comprises a work subsystem and a regeneration subsystem. The work subsystem comprises a circulation loop formed by a heat source tower heat pump system and a second adjustment valve (9). The regeneration subsystem comprises an antifreeze solution circulation system and a draw solution circulation system. The antifreeze solution circulation system is coupled with the draw solution circulation system through a forward osmosis device (8).

Description

technical field [0001] The invention relates to the field of air conditioning and refrigeration, in particular to a device for rectifying and regenerating antifreeze solution of a heat source tower. Background technique [0002] In order to deal with the frosting problem of air source heat pumps in winter, there are currently two types of solutions. One is to take various defrosting measures against the frosting problem; the other is to use the heat source tower heat pump system that has gradually received attention in recent years. To replace the air source heat pump system, while avoiding the problem of frosting, it also retains the characteristics of the heat pump system, which can be used in both winter and summer and has high efficiency. The heat source tower heat pump system exchanges heat and mass with the air through the antifreeze solution, absorbs the sensible heat and latent heat in the air to provide heat source for the evaporator, so that the system can still op...

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Problems solved by technology

Thermal regeneration includes non-boiling regeneration and boiling regeneration. The former has the advantages of low-grade energy utilization, but has the disadvantages of large mass transfer potential difference, low thermal efficiency and complicated operation, and there are certain difficulties in the actual promotion process (for example, the application number is 201010567051.4 and 200910098008.5); the latter boils and evaporates the water in the solution to separate in a vacuum environment, has good heat and mass transfer performance, lower requirements for the temperature level of low-grade heat sources, and has great energy-saving potential. The system is simple, but The antifreeze solution contains more non-condensable gas in the open cycle, which greatly affects the vacuum boiling effect, so the vacuum pump needs to be continuously evacuated to maintain a certain vacuum degree, thereby generating a large demand for electric energy, making the boiling regeneration system The efficiency is greatly reduced and the feasibility is lost

Work-driven regeneration uses a reverse osmosis device to change the chemical potential of water in a concentrated solution by applying external pressure and make it permeate into a dilute solution to achieve water separation. The patent application number 200910307940.4 first proposed a single-stage regeneration system, but did not Effectively solve the problem of antifreeze heating, the operating pressure is high, and the pressure energy recovery is not considered. The patent application number 201320019403.1 adopts two-stage osmosis to reduce the operating pressure, and introduces pressure energy recovery and heat pump unit recooler to optimize the system structure, further The efficiency of the system is improved, but the addition of the energy recovery device increases the initial investment of the system and reduces the technical economy

[0003] In summary, among many technical measures for antifreeze regeneration in heat source towers, boiling regeneration is a relatively simple and efficient regeneration method. It can effectively use low-grade heat sources without increasing high pressure or energy recovery. However, boiling regeneration usually uses water as a low boiling point component and separates it from the solution by endothermic evaporation, which brings about two problems: one is that the low concentration of the antifreeze solution makes the required heat source temperature smaller and the temperature difference The proportion of heat transfer loss is relatively large; the second is that the latent heat of vaporization of water is relatively large, and more heat needs to be consumed in the separation process

In view of the above problems, one solution is to carry out multi-effect regeneration, but this will cause the complexity of the system and reduce the technical and economic performance. Therefore, it is necessary to invent an antifreeze solution regeneration that can solve the above problems and maintain the simplicity of single-effect regeneration device

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