Waste heat ammonia distillation device and waste heat ammonia distillation method for gas primary cooler

Abstract

The invention discloses a waste heat ammonia distillation device and a waste heat ammonia distillation method for a gas primary cooler. The waste heat ammonia distillation device for the gas primary cooler comprises an ammonia distillation tower, wherein the ammonia distillation tower comprises a flashing section and a dephlegmator, a residual ammonia water is formed in the upper part of the ammonia distillation tower, a waste water outlet is formed in the bottom of the flashing section, a waste water inlet is formed in the upper part of the waste water outlet, the waste water outlet is connected with a waste water circulating pump, the waste water circulating pump is connected with the upper section of the primary cooler, the upper section of the primary cooler is connected with the waste water inlet in the upper part of the flashing section of the flashing tower, an outlet in the top of the dephlegmator is connected with an inlet of a condenser, an outlet of the condenser is connected with an inlet in the middle part of a gas-liquid separator, an outlet in the upper part of the gas-liquid separator is connected with a vacuum system, noncondensable gas pumped from the vacuum system is sent back into a gas pipeline, and an outlet in the bottom of the gas-liquid separator is connected with a follow-up system. The waste heat ammonia distillation device for the gas primary cooler has the advantages that heat of a high-temperature part in saturated raw gas of the gas primary cooler is recycled as a residual ammonia water ammonia distillation heat source, less ammonia distillation waste water is discharged, usage amount of circulating cooling water of the gas primary cooler is reduced, and the aims of saving energy and reducing emission are achieved.

Description

technical field [0001] The invention relates to the technical field of waste heat utilization of coke oven gas and ammonia distillation equipment, and relates to a waste heat ammonia distillation device of a primary gas cooler and a waste heat ammonia distillation method. Background technique [0002] The residual ammonia water in the coking industry contains NH 3 、H 2 Various harmful substances such as S, HCN, ammonium salt, etc. must be distilled to remove the main harmful substances before they can be sent to the biochemical water treatment system. The conventional residual ammonia distillation (ammonia distillation) in the prior art generally uses atmospheric pressure steam The method of steam stripping, the defective that this method exists is to consume a large amount of (water vapor) energy medium. [0003] The coking industry is a high-energy-consuming, high-pollution industry. At the same time, a large amount of low-quality heat energy can be recycled in the cokin...

AI Technical Summary

Problems solved by technology

[0002] The residual ammonia water in the coking industry contains NH 3 、H 2 Many harmful substances such as S, HCN, ammonium salt, etc. must be distilled to remove the main harmful substances before they can be sent to the biochemical water treatment system. The conventional residual ammonia distillation (ammonia distillation) in the prior art generally uses atmospheric pressure steam The method of steam stripping, the defect that this method exists is to consume a large amount of (water vapor) energy medium

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