Free energy heat pump multiple-effect evaporation device and process

Abstract

The invention belongs to the technical field of energy conservation and environment friendliness, and relates to a free energy heat pump multiple-effect evaporation device which integrates a heat pump and a multiple-effect evaporation system, and a free energy heat pump multiple-effect evaporation process. The free energy heat pump multiple-effect evaporation device comprises the heat pump and the multiple-effect evaporation system which is integrated with the heat pump, wherein the heat pump is a medium- and high- temperature heat pump and is driven by a power supply system; the multiple-effect evaporation system comprises a vertical heat exchanger, a multiple-effect separator, a multiple-effect evaporator, a condenser, a heat exchanger, a delivery pump and a vacuum pump; and the medium-and high- temperature heat pump is communicated with the vertical heat exchanger and the condenser by a process pipeline. According to the free energy heat pump multiple-effect evaporation device and the free energy heat pump multiple-effect evaporation process, the running of the heat pump is adopted, and a cold source and a heat source are utilized organically, so that the aim of energy conservation can be fulfilled in the first-effect or second-effect operating state, operating energy consumption is reduced, and the simplification of equipment and the reduction of fixed investments are facilitated; and the free energy heat pump multiple-effect evaporation device can operate under the condition of lack of steam, the number of laying of steam pipelines can be reduced, a circulating cooling water system can be eliminated, and the waste heat discharge is reduced.

Description

technical field [0001] The invention belongs to the technical field of energy saving and environmental protection, and in particular relates to a free energy heat pump multi-effect evaporator integrated with a heat pump and a multi-effect evaporator system and a process. Background technique [0002] At present, the separation of solvent and solute in the solution or the concentration of the solution mainly adopts methods such as membrane separation and evaporation. Membrane separation is widely used due to the advantages of low energy consumption, but at the same time, it has high requirements for the SDI index of the solution, the osmotic pressure is limited to a certain range, and it cannot be concentrated indefinitely. In many cases, the use is limited and evaporation is required. Evaporation energy consumption is high, so people have invented various forms of energy-saving evaporation methods, such as multi-effect falling film evaporation equipment, which have been wide...

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Problems solved by technology

Conversely, there are many inventions of water-source high-temperature heat pump units, such as CN101464057A and CN1171052C, but they have not yet been published in the literature for multi-effect evaporation.

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