Coal water slurry gasification process method suitable for treating waste water containing high-concentration ammonia and nitrogen and COD

Abstract

The invention discloses a coal water slurry gasification process method suitable for treating waste water containing high-concentration ammonia and nitrogen and COD. The method includes the following steps that 1, coal water slurry is prepared; 2, the coal water slurry is combusted in a gasification furnace; 3, washing and cooling are carried out in a quenching chamber; 4, ash is collected and discharged; 5, crude gas is purified; 6, carbon black water is purified. By utilizing the production characteristic that it is needed to add part of water in coal water slurry preparation and adopting the process of preparing the coal water slurry by replacing clean river water with the waste water, problems existing in slurrying characteristics are effectively solved, the waste water is utilized without the limitation of the concentration of ammonia and nitrogen and COD, and industrialized continuous production is achieved; according to the coal water slurry prepared from the waste water containing high-concentration ammonia and nitrogen and COD, in the environment where the gasification combustion temperature is 1400 DEG C and the operation pressure is larger than 2 MPa, the waste water containing high-concentration ammonia and nitrogen and COD is subjected to pyrolysis, thoroughly treated and converted into useful synthesis ammonia and urea raw materials, and therefore the effect of making waste profitable is achieved.

Description

technical field [0001] The invention relates to a coal-water slurry gasification process suitable for treating high-concentration ammonia nitrogen and COD sewage. Background technique [0002] Ammonia nitrogen and COD wastewater are one of the main pollutants discharged by many production industries, and ammonia nitrogen pollution in water is becoming more and more serious. Ammonia nitrogen can cause eutrophication in water bodies and lead to environmental pollution. Excessively high ammonia nitrogen concentration will inhibit natural nitrification, cause water hypoxia, cause fish poisoning, and reduce water self-purification ability. Therefore, economical and effective control of ammonia nitrogen wastewater pollution is of great importance to the environment. the value of. At present, there are many treatment methods for high-concentration ammonia nitrogen and COD wastewater. The existing processes for treating high-concentration ammonia nitrogen and COD wastewater have di...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a technical scheme suitable for the coal-water slurry gasification process for the treatment of high-concentration ammonia nitrogen and COD sewage in view of the deficiencies in the prior art, and utilize the production characteristics that the coal-water slurry needs to add part of water, Using sewage instead of Qingjiang water to make coal-water slurry technology effectively solves the problem of slurry-forming characteristics, and realizes that the utilization of sewage is not limited by the concentration of ammonia nitrogen and COD, and achieves continuous industrial production. The coal-water slurry made by using high-concentration sewage Under the environment of gasification combustion temperature of 1400°C and operating pressure greater than 2MPa, sewage containing high concentration of COD and ammonia nitrogen is pyrolyzed at high temperature, treated thoroughly, and converted into useful synthetic ammonia and urea raw materials, turning waste into treasure

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