Filter for sea water desalination pretreatment

Abstract

The invention relates to a filter for a pretreatment technology of sea water desalination. Sea water corrosion resistant antiseptic is added into filter concrete; a concrete interior surface contacting with sea water is coated with sea water resistant anticorrosive paint; steel bar in the concrete is provided with steel bar rust remover; metal pieces contacting with sea water in the filter are made of high alloy duplex stainless steel S32205 (ASTM); non-metallic materials comprise sea water corrosion resistant FRP glass fiber reinforced plastic, ABS engineering plastic and EPDM rubber, etc. Durability of the filter is enhanced; air water back washing and surface sweep washing are employed by the filter to realize a good back washing effect; technical breakthrough in filter material selection is realized by employing a double layer filter material, which has strong dirt containing ability, and quality of water outlet from the filter is improved substantially; during air water back washing, electric draining gate valve is closed, so as to realize high speed backwashing, short backwashing time, long backwashing period, small water consumption and avoid loss of filter material during backwashing. The filter has a high degree of automatic operation and is convenient for management; besides, a civil structure is simple in order to save capital construction investment and facilitate construction.

Description

Technical field [0001] The invention relates to a filter tank for seawater desalination pretreatment. Background technique [0002] Seawater desalination, also known as "seawater desalination", is the process of removing the salt in seawater to obtain fresh water. Seawater desalination is an open-source incremental technology to realize the utilization of water resources, which can increase the total amount of fresh water without being affected by time, space and climate. The water quality is good and the price is gradually becoming reasonable, which can guarantee the drinking water and industrial water demand of coastal residents. [0003] In recent years, the desalination of seawater in the world is developing toward the goal of high efficiency, low energy consumption and large-scale development. Reverse osmosis (SWRO), multi-stage flash evaporation (MSF) and multi-effect evaporation (MED) have become the mainstream of large-scale seawater desalination technologies. . ...

AI Technical Summary

Problems solved by technology

The filter solves the durability problem of structures and materials in the seawater corrosion environment; solves the problem of uneven distribution of gas and water often encountered in production and operation; solves the problem that the filter plate, filter beam is not level, and the seam of the filter plate is not sealed. Severe phenomenon; solve the problem that the slag cannot be cleared in the gas-water distribution channel and the condition of the lower part of the filter plate cannot be observed; the drainage method of the filter drainage channel is innovated, and the backwashing is performed by controlling the drainage electric ram valve, high-speed backwashing, backwashing The flushing time is short, the backflushing cycle is long, the water consumption is small, and there will be no loss of filter material and sand running during backwashing; the filter adopts air-water backwashing and surface sweeping, and the backwashing effect is good; there are new technologies in the selection of filter materials The technical breakthrough, the use of double-layer filter material, the filter material has a strong ability to contain dirt, and the quality of the effluent water from the filter is significantly improved

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