System for recovering residual heat of ammonia vapor on top of surplus ammonia water ammonia still

Abstract

The invention discloses a system for recovering residual heat of ammonia vapor on the top of a surplus ammonia water ammonia still. The system comprises an ammonia still, a heat pump unit, a circulating hot water pump, a reboiler, a waste water pump and a gas-liquid separator, wherein the heat pump unit is an absorptive heat pump unit which comprises an evaporator end, an absorber end, a generator end and a condenser end. The heat pump unit is placed on the top of the ammonia still and is used for recycling latent heat of ammonia vapor on the top of the still to heat circulating hot water, the heated circulating hot water is used for heating ammonia distilling waste water at the bottom of the still through the reboiler to produce saturated vapor, and the saturated steam returns into the ammonia still to supply distillation energy and realize recycling of energy, so that the consumption of coal gas or vapor is lowered, and the utilization ratio of recovered residual heat is increased. The ammonia vapor is subjected to gas-liquid separation after recovery of the latent heat, and liquid-phase ammonia water returns into the ammonia still for serving as reflux liquid.

Description

technical field [0001] The invention relates to the technical field of coking residual ammonia water treatment, in particular to an ammonia steam waste heat recovery system at the top of a distillation tower for residual ammonia water. 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 needs to go through treatment processes such as oil removal, phenol removal, ammonia distillation, and phenol cyanide sewage. Ammonia distillation is to remove ammonia, cyanide and sulfide in the remaining ammonia water by distillation, improve the water quality of wastewater, meet the requirements of phenol cyanide sewage treatment process, and recover ammonia for desulfurization or production of ammonium sulfate. According to the heating method, the ammonia distillation process of residual ammonia water ca...

AI Technical Summary

Problems solved by technology

The thermal energy of ammonia vapor generated at the top of the ammonia distillation tower has not been effectively recovered and utilized, resulting in waste, reducing energy utilization, and increasing process water consumption

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