Fertilizer-plant washing coal gas circulating water purification device and method

Abstract

The invention discloses a fertilizer-plant washing coal gas circulating water purifying device, which comprises a water returning channel connected with a water outlet of a coal gas washing device, the water returning channel is connected to a water inlet of a horizontal sedimentation tank, and the advection sedimentation tank is used for reducing a flow rate for precipitating large-particle-sizeimpurities in circulating water and further for performing first-stage purification of the circulating water. A water outlet of the horizontal sedimentation tank is connected to a water inlet of an integrated water purifier through a hot water pool, and the integrated water purifier is used for performing second-stage purification of the circulating water to remove small-particle-size impurities in the circulating water. A water outlet of the integrated water purifier is connected to a cool water rack, and the cool water rack is used for cooling the circulating water; and a water outlet of thecool water rack is connected to a cool water pool through a cool water channel, and the cool water pool is used for storing circulating water after cooling and conveying the circulating water to a water inlet of the coal gas washing device through a cool water pump. The purifying device of the invention reduces the processing difficulty and the processing cost of the gas-making circulating waterof a fertilizer plant.

Description

【Technical field】 [0001] The invention belongs to the field of coal gas purification technology in chemical fertilizer plants, and in particular relates to a purification device and method for cleaning gas circulating water in chemical fertilizer plants. 【Background technique】 [0002] At present, the composition of the gas-making circulating water in chemical fertilizer plants is complex, and it contains many toxic and harmful substances. According to environmental protection requirements, it cannot be discharged directly. However, the cost of further advanced treatment is too high. To solve this problem, the following methods are generally used to solve this problem: First, the hot water in the washing cycle enters the pool and is directly used again after it is directly deposited. Too much water; second, reduce turbidity and water temperature by draining water and replenishing fresh water. This method first causes environmental pollution, and second, causes excessive fres...

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Problems solved by technology

[0002] At present, the composition of gas-making circulating water in chemical fertilizer plants is complex, and it contains many toxic and harmful substances. According to environmental protection requirements, it cannot be discharged directly. However, the cost of further advanced treatment is too high

To solve this problem, the following methods are generally used to solve this problem: First, the hot water in the washing cycle enters the pool and is directly used again after it is directly deposited. Too much water; second, reduce turbidity and water temperature by draining water and replenishing fresh water. This method first causes environmental pollution, and second, causes excessive fresh water consumption and increases costs; third, After the initial precipitation, it is sent to sewage treatment, which greatly increases the difficulty of sewage treatment and increases the operating cost

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