Low-temperature multi-effect seawater desalting multi-stage superposed adjusting raw water supply system

Abstract

The invention relates to a low-temperature multi-effect seawater desalting multi-stage superposed adjusting raw water supply system which comprises a plurality of evaporators connected in series, adopts a multi-stage water supply mode, and is provided with multi-stage water supply mains, wherein one communication device is arranged between adjacent raw water supply mains to adjust water supply amounts among different raw water supply mains, the raw water supply amount of each stage except for the last stage is the optimal raw water spray amount of each effect, and the total raw water supply amount of the last stage is more than the sum of the required raw water amount of each effect of this stage. When the raw water supply amount of each stage is less than the optimal required raw water amount of all effects of this stage, the raw water supply main of the next stage adjusts the supply to the water supply main of the previous stage. By using the technical scheme of the invention, the ultimate discharge concentration of saline water can be controlled.

Description

technical field [0001] The system of the present invention relates to a low-temperature multi-effect seawater desalination device material water supply system. The system can correspond to different seawater salinity changes and load changes, adjust the water supply of fresh seawater material water, and at the same time maintain the water spraying of each effect of the main evaporator It can control the final concentration of brine discharged from the low-temperature multi-effect seawater desalination device, and reduce the discharge of brine and improve the system efficiency under the condition of low salinity and low load of seawater. Background technique [0002] At present, the material water supply system of low-temperature multi-effect seawater desalination equipment generally adopts one-stage advection water supply, multi-stage counter-current spray water supply and other systems. Generally, seawater desalination projects do not have strict requirements on the final b...

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Problems solved by technology

If the equipment load decreases at this time, the final brine concentration will still decrease. If it is necessary to ensure the final discharge concentration of brine, the only way to further increase the recirculation of brine will be to cause an excessive increase in the brine concentration of the primary material water.

Therefore, this system method is acceptable for the multi-stage countercurrent material water supply system, and it is more unfavorable for the downstream multi-stage material water supply system, because the brine concentration in the downstream system increases the most at this time due to the high temperature effect, which has a greater impact on equipment scaling. Large, the low temperature effect does not change much at this time and the original rated load

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