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

Inactive Publication Date: 2015-04-29
CHENGDU HUAXITANG INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the technical problem that coking residual ammonia water cannot meet the requirements of denitrification using ammo

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The process of preparing SCR reducing agent with coking residual ammonia water as raw material. The ammonia vapor produced by the shrinker of the ammonia distillation device in the gas purification workshop of the coking plant is condensed to obtain coking concentrated ammonia water. Add NaOH lye to the ammonia water, mix it evenly, and then send it to the distillation tower for secondary distillation. After the ammonia vapor at the top of the tower passes through the separator, it passes through the condenser to obtain refined concentrated ammonia water.

Embodiment 2

[0042] The process of preparing SCR reducing agent with coking residual ammonia water as raw material. The ammonia vapor produced by the shrinker of the ammonia distillation device in the gas purification workshop of the coking plant is condensed to obtain coking concentrated ammonia water. Add NaOH lye to the ammonia water, mix it evenly, and then send it to the distillation tower for secondary distillation. After the ammonia vapor at the top of the tower passes through the separator, it passes through the condenser to obtain refined concentrated ammonia water.

[0043] The refined concentrated ammonia water contains 16% ammonia and contains H 2 S 3.5mg / l, hydrogen cyanide 3.2mg / l.

Embodiment 3

[0045] The process of preparing SCR reducing agent with coking residual ammonia water as raw material. The ammonia vapor produced by the shrinker of the ammonia distillation device in the gas purification workshop of the coking plant is condensed to obtain coking concentrated ammonia water. Add NaOH lye to the ammonia water, mix it evenly, and then send it to the distillation tower for secondary distillation. After the ammonia vapor at the top of the tower passes through the separator, it passes through the condenser to obtain refined concentrated ammonia water.

[0046] Add 15kg of lye with a mass fraction of 31% per ton of coking concentrated ammonia water.

[0047] The refined concentrated ammonia water contains 26% ammonia and contains H 2 S 3.2mg / l, hydrogen cyanide 2.6mg / l.

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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.

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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Application Information

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IPC IPC(8): C01C1/10B01D53/90B01D53/56
Inventor 任毅李东林
Owner CHENGDU HUAXITANG INVESTMENT
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