Desulfuration and ammonia distillation device for coal gas purification

Abstract

The invention provides a desulfuration and ammonia distillation device for coal gas purification, and relates to the technical field of auxiliary equipment for coal gas purification process. An ammonia distilling tower (9) of the desulfuration and ammonia distillation device for the coal gas purification is communicated with an ammonia washing tower (11) through a pipeline I (10), the pipeline I (10) is communicated with a crude benzene separation water tank (5) through a pipeline II (17), and an underground pump (14) is arranged between the crude benzene separation water tank (5) and the pipeline II (17). The desulfuration and ammonia distillation device for the coal gas purification according to the invention has a simple structure, crude benzene separation water in the crude benzene separation water tank of the desulfuration and ammonia distillation device for the coal gas purification can be quickly pumped into the ammonia washing tower, and the crude benzene separation water produced in the operation process of the desulfuration and ammonia distillation device for the coal gas purification is used to replace ammonia distilling water for operation in an alkaline washing segment of the ammonia washing tower, so that the consumption of the ammonia distilling water as alkaline liquid diluting water is reduced effectively, operation load of a solvent dephenolization and ammonia distillation system is reduced, ammonia distilling steam consumption is lowered, and wastewater treatment cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of gas purification process auxiliary equipment, and more specifically relates to a gas desulfurization and ammonia distillation device for gas purification. Background technique [0002] In the field of gas purification, the "AS" method of desulfurization and ammonia distillation process is mainly used for gas purification. The method recycles the liquid after deacidification and ammonia distillation to wash the sulfur and ammonia in the gas, so as to achieve the effect of purifying the gas. When the desulfurization and ammonia distillation device for gas purification is working, the steam condensate and a small amount of water in the washing oil produced by the debenzene process of the desulfurization and ammonia distillation device for gas purification are removed by the water remover of the debenzene tower and the light benzene oil-water separator. The oil and water are separated, and then directly sent...

AI Technical Summary

Problems solved by technology

The remaining ammonia solvent needs to consume sodium hydroxide and solvent oil during dephenolization, and consumes a large amount of steam when distilling ammonia

In the ammonia washing tower, it is necessary to use sodium hydroxide washing liquid to further remove H in the gas 2 S, the existing technology is to use ammonia distillation waste water to dilute 30% sodium hydroxide to 3-4%, and remove H in the gas 2 After S, the lye is continuously sent to the ammonia washing tower to decompose and fix the ammonium salt. In this way, there is always 10-20m 3 Ammonia distillation wastewater of about / h circulates between the ammonia washing tower, the deacidification tower and the ammonia distillation tower. This process consumes a large amount of steam and increases the power cost, which leads to an increase in the cost of the desulfurization and ammonia distillation device for gas purification, and affects the gas consumption. Purification quality

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