Backwashing and filtering device for heat exchanger of seawater desalination system and backwashing method of backwashing and filtering device

Abstract

The invention relates to the technical field of seawater desalination, in particular to a seawater desalination system heat exchanger backwashing filter device and a backwashing method thereof, the IPC classification number is C02F, the seawater desalination system heat exchanger backwashing filter device comprises a frame body, an automatic control device, a heat exchange backwashing filter device, a heat source outlet pipe, a heat source inlet pipe and an auxiliary bypass, and the automatic control device is fixedly connected to the upper end of the frame body; the heat exchange backwashing and filtering device is mounted in the frame body; the heat source outlet pipe and the heat source inlet pipe are connected to one side of the frame body; the frame body comprises a supporting frame, an upper sliding guide rail, a lower sliding guide rail and a fixed end plate. According to the invention, safe and stable operation of the sea water desalination device can be effectively guaranteed, and flow channel blockage and disassembly cleaning frequency of the heat exchange backwashing filter device are reduced; the device has the advantages of being flexible to operate, high in automation degree, small in occupied area, high in heat exchange efficiency, good in backwashing effect, low in maintenance cost, stable in performance, wide in application, free of disassembly and cleaning, remarkable in comprehensive effect and the like.

Description

technical field [0001] The invention relates to the technical field of seawater desalination, in particular to a backwashing filter device for a heat exchanger of a seawater desalination system and a backwashing method thereof, and the IPC classification number is C02F. Background technique [0002] At present, the low-temperature multi-effect seawater desalination device refers to the desalination technology with the maximum evaporation temperature of the original seawater below 70 °C. and condensation, the evaporation temperature of the latter effect is lower than that of the former effect, and after multiple evaporation and condensation, the process of obtaining desalinated water that is multiple times the amount of steam. In the process of low temperature multi-effect seawater desalination heat exchange, the raw seawater or concentrated seawater is evenly distributed on the outer surface of the heat exchange tube bundle of each evaporator through the feeding system throu...

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Problems solved by technology

[0007] The invention provides a backwash filter device and a backwash method for a heat exchanger in a seawater desalination system, which can effectively solve the deposition of impurity particles in the discharge systems of concentrated brine, condensed water, and NCG cooling water of a low-temperature multi-effect distillation seawater desalination device. In the heat exchange device used for waste heat recovery, impurity particles block the medium flow channel of the heat exchange device when flowing through the heat exchange device, resulting in a slowdown of the medium flow rate, an increase in the pressure difference between the inlet and outlet sides, a reduction in the efficiency of waste heat utilization, and eventually loss of heat exchange. During the operation, the process of dismantling and cleaning the heat exchange device has high safety risks, poor cleaning effect, low work efficiency, long downtime, high maintenance costs and many construction safety risks and uncontrollable factors, and cannot fundamentally solve the problem of replacement. The problem of frequent clogging of thermal units

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