Low-temperature multi-effect seawater desalination process

A low-temperature, seawater technology, applied in the field of low-temperature multi-effect seawater desalination system, can solve the problems of high cost and high electricity cost, and achieve the effects of reducing energy consumption, large-capacity and high-efficiency seawater desalination, and avoiding irreversible losses

Inactive Publication Date: 2006-09-27
QINGDAO UNIV
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Problems solved by technology

[0003] As far as the current technology is concerned, for reverse osmosis seawater desalination, the most cost-affecting factor is the cost of electricity, followed by the cost of chemicals and membrane replacement
For low-temperature multiple-effect distillation and multi-stage flash desalination, the biggest factor affecting cost is steam cost, followed by electricity cost

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  • Low-temperature multi-effect seawater desalination process
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Embodiment 1

[0025] Embodiment 1: A kind of equipment device that realizes the method of the present invention, its main components include by condenser 52, compressor 3, normal working evaporator 87, start-up process evaporator 36, throttling expansion valve 42, heat pump system liquid storage tank 44. A closed heat pump circulation system composed of a dry filter 43, etc., consisting of a first effect evaporator 19, a second effect evaporator 18, a second effect evaporator 17, ..., an nth effect evaporator 16, and a condenser 15 The main part of low-temperature multi-effect seawater desalination consisting of evaporator seawater tanks 20, 21, 22, 23 and evaporator fresh water tanks 26, 27, 28, 29, etc. The flash energy recovery part is composed of seawater supply pump 1, Concentrated brine discharge pump 30, seawater circulation pumps 11, 12, 13, 14, starting seawater pump 38, etc. constitute the water circulation power part, and the starting valve 40, working valve 41, regulating valves ...

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Abstract

This invention refers to a method about low-temperature multiple-effect desalination of sea water, especially about a new method which effectively applied thermal pumping power-saving technology to desalination of sea water. The desalination of sea water system which apply this method has n effect evaporator(n=2-50) and one condensator aggregately, containing six systems of feeding seawater, recirculated salt water, product water, vacuum, incoagulable gas removal, thermal pumping circulation and starting heating in addition. This invention is based on irreversible thermodynamics principle, via organic integration of evaporator, condensator and low-temperature multiple-effect desalination of sea water system in closed circuit thermal pumping system, as well as special design of energy recovery tache in low-temperature multiple-effect desalination of sea water, decreasing irreversible loss of diversified thermal transmission course which the desalination of sea water refers to in maximum limit, sequentially letting the entropy increasing of whole desalination of sea water course be the least, realizing efficient energy-saving desalination of sea water course.

Description

Technical field: [0001] The patent of the present invention relates to a high-efficiency and energy-saving seawater desalination method, in particular to a new method of efficiently applying the energy-saving technology of a closed heat pump cycle to a low-temperature multi-effect seawater desalination system, that is, a low-temperature multi-effect seawater desalination method. technical background: [0002] At present, the technologies used in desalination in the world are mainly thermal method and membrane method, which are also called distillation method and reverse osmosis method respectively. Distillation is to turn seawater into steam, and the steam is cooled to obtain high-purity fresh water. According to different evaporative cooling methods, distillation methods are usually divided into three types: multi-stage flash evaporation, multi-effect distillation and vapor compression distillation (also called compressed air distillation). Among them, multi-stage flash ev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F103/08
CPCY02A20/124
Inventor 田小亮曲源孙晖
Owner QINGDAO UNIV
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