Pressure-reduction, alkali-addition and ammonia-distillation system

Abstract

The invention discloses a pressure-reduction, alkali-addition and ammonia-distillation system. The system comprises a residual ammonia water tank, an ammonia distillation tower, a finished product ammonia water tank and a vacuum pumping system; by the improvements of using a metering pump to simultaneously adding an alkali liquor in an alkali liquor tank into pipes arranged at the front end and the back end of the residual ammonia water tank, and connecting the residual ammonia water tank and the vacuum pumping system with a tail gas recycling device, the use conditions of negative pressure ammonia distillation process are prepared. According to the pressure-reduction, alkali-addition and ammonia-distillation system, only an alkali-addition position needs to be adjusted without changing former ammonia distillation process and devices, the quality of ammonia distillation waste water can satisfy the demand of next process, so that the process is simple and the investment is low; the switch of pressure-reduction ammonia-distillation and normal pressure ammonia-distillation is not affected; the pressure-reduction ammonia-distillation process is improved; and the industrial process of the pressure-reduction ammonia-distillation is promoted. With the simplest process changes and lowest investment, the pressure-reduction, alkali-addition and ammonia-distillation system improves the quality of the ammonia distillation waste water, promotes the research process of the pressure-reduction ammonia-distillation, and is in favor of promoting the popularization and application of the pressure-reduction ammonia-distillation process.

Description

technical field [0001] The invention relates to the technical field of deammonization of ammonia water by coal coking, in particular to a decompression adding alkali ammonia distillation system. Background technique [0002] During the coking process of coal, a certain amount of ammonia nitrogen, cyanide, sulfide, phenol and residual ammonia water with high concentrations of COD are produced. The remaining ammonia water generally undergoes treatment processes such as degreasing, ammonia steaming, and phenol removal. Ammonia distillation can also remove cyanide and sulfide in the remaining ammonia water while removing ammonia nitrogen in the remaining ammonia water, so that the ammonia distillation wastewater can meet the water quality requirements of biological dephenolization. The ammonia distillation process decomposes the fixed ammonium salt into volatile ammonia by adding alkali, and then separates the volatile ammonia by using the different boiling points of ammonia an...

AI Technical Summary

Problems solved by technology

Due to the reduction of operating pressure and temperature in the new process of ammonia distillation under reduced pressure, the ammonia distillation wastewater cannot meet the water quality requirements of the biological dephenolization process by adopting the traditional atmospheric pressure ammonia distillation and alkali addition method

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