An ammonia recovery system for coal chemical ammonia-containing wastewater

By adding alkali solution and optimizing the dual-tower stripping process in the coal chemical ammonia recovery system, the problems of equipment corrosion and unstable ammonia quality were solved, achieving efficient ammonia recovery and wastewater purification, meeting discharge standards, and improving the economic and environmental benefits of the unit.

CN224298937UActive Publication Date: 2026-05-29SHANGHAI HUAYI ENG CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANGHAI HUAYI ENG CO LTD
Filing Date
2025-05-27
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In existing coal chemical ammonia recovery technologies, traditional ammonia recovery processes suffer from severe equipment and pipeline corrosion, unstable ammonia product quality, and low ammonia recovery efficiency. Furthermore, the NH3-N index of the purified wastewater is difficult to meet discharge standards.

Method used

A dual-tower stripping process for ammonia recovery is adopted, which involves adding alkali and optimizing the process. The system consists of a decomposition tower, an ammonia stripping tower, and an ammonia absorption tower. The alkali solution is used to reduce the hydrogen sulfide content in the mixer of the ammonia stripping tower feed line, and the ammonia recovery efficiency is improved by adding reflux condensate and demineralized water.

Benefits of technology

It effectively avoids equipment and pipeline corrosion, improves ammonia recovery efficiency, reduces hydrogen sulfide content in the product ammonia water, and ensures that the NH3-N index of the purified wastewater meets the discharge standards, thereby improving the quality of ammonia water and the economic efficiency of the equipment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides an ammonia recovery system of coal chemical ammonia-containing wastewater, which comprises a decomposition tower feed buffer tank, a decomposition tower, an ammonia distillation tower, an ammonia distillation tower condenser, an ammonia distillation tower primary gas-liquid separation tank, an ammonia distillation tower recondenser, an ammonia distillation tower secondary gas-liquid separation tank, an ammonia absorption tower, an ammonia absorption tower cooler, an ammonia water buffer tank and an ammonia water tank which are sequentially connected through pipelines; a mixer is arranged on the connecting pipeline of the decomposition tower and the ammonia distillation tower, and the mixer comprises a lye inlet. The application recovers effective ammonia in the coal chemical ammonia-containing wastewater, improves the economy of the system, reduces the discharge of hazardous waste of the coal chemical device, effectively solves the problem of high material selection requirement of the equipment and pipeline of the ammonia distillation tower system, and improves the ammonia water quality.
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