Process for preparing SCR reducing agent from coking residual ammonia wastewater as raw material

A technology for coking residual ammonia water and reducing agent, which is applied in the fields of ammonia preparation/separation, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of coking residual ammonia water failing to meet the process requirements of denitrification and using ammonia, and achieves the reduction of investment. Effect
CN104556147AInactive Publication Date: 2015-04-29CHENGDU HUAXITANG INVESTMENT
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHENGDU HUAXITANG INVESTMENT
Publication Date
2015-04-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a process for preparing an SCR reducing agent from a coking residual ammonia wastewater as a raw material. The process is characterized by comprising the following steps: condensing ammonia vapor generated by a dephlegmator of an ammonia stripping system of a gas purification workshop in a coking plant to obtain coking strong ammonia water; removing impurities from the coking strong ammonia water by a filter and deoiling by an adsorption tower; adding an NaOH alkali liquor to the ammonia water, mixing evenly, and then conveying to a distillation tower to carry out secondary distillation; processing the ammonia vapor at the tower top through the dephlegmator and then processing by the condenser, so as to obtain refined strong ammonia water; adopting coking ammonia water generated by ammonia distillation of the coking residual ammonia wastewater as a preparation raw material of the SCR reducing agent, and refining the coking strong ammonia water to reach the requirements of the reducing agent used for SCR catalytic reduction, so that the denitration cost is reduced when the denitration efficiency is ensured.
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Description

technical field

[0001] The invention relates to the technical field of waste gas pollutant control in coking enterprises, in particular to a process for preparing an SCR reducing agent by using residual ammonia water from coking as a raw material. Background technique

[0002] my country's SO 2 and NO x Emissions are among the highest in the world. Studies have shown that gaseous SO 2 , NO x is the precursor of PM2.5, composed of SO 2 , NO x The amount of PM2.5 transformed by precursors such as VOCs and VOCs is more than that emitted directly. SO 2 , NO x It is one of the main substances that form acid rain. The air pollution and acid rain caused by it are becoming more and more serious, and it is seriously harmful to human health and ecological system. It has become a factor restricting the sustainable development of my country's economy and society.

[0003] On June 27, 2012, the Ministry of Environmental Protection and the General Administration of Quality Superv...

Claims

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