Evaporation concentration system combining vapor compressor and high-temperature heat pump

Abstract

The invention discloses an evaporation concentration system combining a vapor compressor and a high-temperature heat pump, used for realizing the desalting or concentrated crystallization of a solution. The evaporation concentration system is structurally characterized in that an outlet of a liquid supply tank is connected to a solution side inlet of a steam generator through a first stop valve and a float ball valve; a steam outlet of the steam generator is connected to inlets of the vapor compressor and an evaporative condenser through a second stop valve; the outlet of the evaporative condenser is connected to a first coil heat exchanger and a fresh water tank; a solution outlet of the steam generator is connected to a concentrated solution tank through a third stop valve; a solution storage tank is connected to the fresh water tank through a fourth stop valve; a high-temperature water side of a heat pump set is connected with a second coil heat exchanger, a low-temperature water side of the heat pump set is respectively connected with third and fourth coil heat exchangers and a solution heat exchanger in parallel; after being compressed, pressurized and warmed up, steam enters into the evaporative condenser so as to form fresh water; and the solution in the steam generator is evaporated and concentrated into concentrated solution or crystals. The evaporation concentration system is used for recycling the heat of the concentrated solution and the condensed water in the system by utilizing the high-temperature heat pump, so as to achieve the purpose of saving energy.

Description

technical field [0001] The invention belongs to heat energy utilization technology, and in particular relates to an evaporation and concentration combined system for obtaining fresh water, concentrated solution and other products by combining a steam compressor and a high-temperature heat pump. Background technique [0002] Thermal distillation requires the use of a high-temperature heat source and a large amount of heat energy, and the distillation cost and energy consumption are relatively high. The working principle of pressure steam distillation (MVC) technology used in seawater desalination or solution crystallization is to rely on the steam compressor to pressurize the steam and then enter the steam generator. The high-temperature and high-pressure steam releases latent heat to heat the solution in the steam generator, making it Steam is generated, and water vapor is continuously produced. After the water vapor is condensed, fresh water is obtained, and at the same tim...

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Problems solved by technology

Using this method, the comprehensive utilization of system heat is not ideal, mainly reflected in the waste of concentrated solution and condensed water heat in the system. In addition, the multi-stage evaporation and concentration scheme makes the system huge and high in investment.

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