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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 problems such as high cost and electricity cost, and achieve the effect of reducing energy consumption, reducing volume, large-capacity and high-efficiency seawater desalination

Inactive Publication Date: 2009-07-01
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

Method used

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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 The main part of the low-temperature multi-effect seawater desalination composed of , condenser 15, etc., the flash energy recovery part composed of evaporator seawater tanks 20, 21, 22, 23 and evaporator fresh water tanks 26, 27, 28, 29, etc., is composed of seawater Supply pump 1, concentrated brine discharge pump 30, seawater circulation pumps 11, 12, 13, 14, start seawater pump 38, etc. form the water circulation power part, and start valve 40, work valve 41, regulating valve 6, ...

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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 Patents(China)
IPC IPC(8): C02F1/06B01D1/26C02F103/08
CPCY02A20/124
Inventor 田小亮曲源孙晖
Owner QINGDAO UNIV
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