Tubular furnace negative pressure ammonia distillation process

Abstract

The invention discloses a tubular furnace negative pressure ammonia distillation process used for treating coking residual ammonia water. The residual ammonia water enters into an ammonia distillation tower which is used for drawing the negative pressure in the top of the tower by using a vacuum pump of a vacuum system or cooling ammonia in the top of the tower by using a venturi injector, the ammonia of the residual ammonia water is volatilized under the negative pressure state, heat source required by ammonia distillation is provided by the ammonia distillation waste water from the bottom of a circular heating ammonia distillation tower of the tubular furnace. The process of the invention has the advantages of energy conservation, emission reduction and daily operation cost reduction; simultaneously the operation state under the negative pressure and low temperature determines that the requirement of the material quality of the main equipment is not high so that the equipment investment cost at early stage is reduced.

Description

technical field [0001] The invention belongs to a process for treating residual ammonia water in the coking industry, and in particular relates to a process for distilling ammonia under negative pressure in a tubular furnace. Background technique [0002] At present, most of the domestic ammonia distillation processes are direct steam method, which is the most traditional and mature ammonia-rich water distillation process. However, through many years of production practice, the direct steam ammonia distillation process has generally exposed two problems: First, the steam consumption of ammonia distillation is large. Usually, the steam consumption of ammonia distillation in the coking production process accounts for a considerable amount of steam consumption in the entire coking production. Second, the heat source of the direct steam ammonia distillation process comes from direct steam, which greatly increases the amount of biochemical wastewater to be treated. These two asp...

AI Technical Summary

Problems solved by technology

However, through many years of production practice, the direct steam ammonia distillation process has generally exposed two problems: First, the steam consumption of ammonia distillation is large. Usually, the steam consumption of ammonia distillation in the coking production process accounts for a considerable amount of steam consumption in the entire coking production. Second, the heat source of the direct steam ammonia distillation process comes from direct steam, which greatly increases the amount of wastewater to be treated in biochemistry

However, the heat source is provided by gas heating, and the energy has not been greatly saved.

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