Low-temperature multi-effect seawater desalting inter-regenerative multi-stage spraying raw water supply system

Abstract

The invention relates to a low-temperature multi-effect seawater desalting inter-regenerative multi-stage spraying raw water supply system. The system is provided with an intermediate raw water heat exchanger, raw water is heated by a one-stage or multi-stage raw water regenerative heat exchanger and is then introduced into evaporator high-temperature effective units, saline water in the high-temperature effective units is refluxed progressively, is pressurized by an intermediate raw water pump, and is then introduced into an intermediate raw water heat-exchange heater to heat the raw water of the previous stage, and the raw water of this stage is cooled to be used as the raw water of the next effective unit. Compared with a one-stage parallel-flow supply system, the invention raises the concentration ratio of the equipment, improves the heat efficiency for water production, reduces the total raw water supply amount of the equipment, lowers the unit electricity consumption for water production, reduces the heat exchange of the raw water supply and heating equipment, and lowers the equipment cost to a certain extent. Compared with a multi-stage counter-flow raw water supply system, the invention enables low-salinity raw water to correspond to high temperature effect, enables high-concentration raw water to correspond to low temperature effect, lowers the fouling tendency of the equipment, and ensures that the operation of the equipment is safer.

Description

technical field [0001] The invention relates to a material water supply system for a low-temperature multi-effect seawater desalination device, which can improve the overall efficiency of the equipment, reduce the scaling tendency of the equipment, and improve the operation safety of the equipment. Background technique [0002] At present, the material water supply system of low-temperature multi-effect seawater desalination equipment generally adopts two methods: one-stage advection water supply system and multi-stage countercurrent spray water supply system. figure 1 It is an example of the existing one-level advection water supply system. The material water of this system is drawn out after passing through the condenser 1, and is boosted by the first-level material water pump 2. At the same time, it is used as the material water for supplying nine-effect seawater desalination equipment. In order to improve thermal efficiency, the water supply system is equipped with three...

AI Technical Summary

Problems solved by technology

The concentration of high-temperature-effect brine in the multi-stage countercurrent water supply system is the highest, which is easy to cause equipment scaling, which limits the maximum temperature of the first-effect and the overall concentration ratio of the equipment

For the multi-stage countercurrent material water supply system, the brine of the most efficient group needs to be separated from the spray material water. Generally, an external flash evaporation device is installed, and the system is complicated.

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