Heat film coupled water feeding allocating system for desalting seawater

Abstract

The invention provides a heat film coupled water feeding allocating system for desalting seawater and belongs to the technical field of seawater desalting. The heat film coupled water feeding allocating system comprises a seawater lifting pump, a low-temperature and multi-effect seawater desalting device, a concentrated water lifting pump, a seawater reverse osmosis device, a heat exchanger, a first lifting pump, a seawater mixing and allocating box, a first lifting pump, a second lifting pump, a third lifting pump, a temperature sensor, a first control valve, a second control valve, a third control valve, a fourth control valve, a fifth control valve, a sixth control valve, a first shut-off valve and a second shut-off valve. The heat film coupled water feeding allocating system for desalting the seawater has the advantages that residual heat and residual energy of a desalting system are utilized to the greatest extent; the problem that reverse osmosis seawater desalting cannot be normally operated, caused by the fact that the temprature of the seawater in North China is low in winter, is solved; the recovery rate of freshwater is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and in particular relates to a hot-film coupled seawater desalination inlet water preparation system. Background technique [0002] With the rapid development of social economy and the increasing shortage and pollution of water resources, in the northern coastal areas, preferentially adopting reverse osmosis desalination technology to open up new water sources has become a globally recognized effective method to solve the shortage of fresh water resources. In the past two decades, although the energy consumption and cost have been reduced, the high cost of water production is still a factor that restricts the large-scale popularization and application of this technology in the municipal industry, steel industry and other industrial fields. Therefore, in the face of increasingly tense Energy and environmental crisis, further development and utilization of waste heat and energy, incre...

AI Technical Summary

Problems solved by technology

The seawater is desalinated through thermal membrane coupling, and by using the waste heat of MED concentrated brine, it solves the problem that the reverse osmosis seawater desalination cannot operate normally caused by the low seawater temperature in winter in northern my country, and reduces the investment and operation cost of seawater desalination

[0007] The original seawater is desalinated by MED cycle cooling first. The desalinated concentrated brine has a certain temperature, generally 35-40°C. Using the heat of the MED concentrated brine to solve the problem of difficult operation of RO in winter, the high-concentration brine produced after concentration by membrane method Salt water has a very high comprehensive utilization value, which plays a great role in diluting the investment of the entire thermal film coupling system

The invention maximizes the use of waste heat and energy, solves the problem that reverse osmosis seawater desalination cannot operate normally caused by low seawater temperature in winter in northern my country, improves the recovery rate of freshwater, and lays a foundation for the subsequent salt chemical industry to provide high-concentration concentrated brine

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