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Aluminum hydroxide calcinator fume dry method denitration method

A technology of aluminum hydroxide and roasting furnace is applied in chemical instruments and methods, separation methods, furnaces, etc., to achieve the effects of low operating cost, no secondary pollution, and convenient transportation and installation.

Inactive Publication Date: 2018-05-11
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the flue gas denitrification technology of aluminum hydroxide roasting in the aluminum industry is still blank, and it is an urgent problem to be solved in environmental protection and clean production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Aluminum hydroxide roaster with output of 1350t / h, the fuel is mixed combustion of natural gas and coal-to-gas, and the flue gas volume is 150000Nm 3 / h, NOx concentration 150-200mg / Nm 3 , the amount of denitrification agent is 0.5-1.5 times of the mass of NOx, and the solid-gas ratio in the agent injection system is 5:1 (kg-agent / kg-air). NO x The removal rate is more than 80%, and the flue gas emission concentration of the system is less than or equal to 100mg / Nm as shown by the roaster flue gas online detection system 3 , can achieve emission standard.

Embodiment 2

[0027] Aluminum hydroxide roaster with output of 1550t / h, the fuel is mixed combustion of natural gas and coal-made gas, and the flue gas volume is 170000Nm 3 / h, NOx concentration 240-320mg / Nm 3 , the amount of denitration agent is 1.5-2.5 times the mass of NOx, and the solid-gas ratio in the agent injection system is 20:1 (kg-agent / kg-air). NO x The removal rate is over 88%, and the flue gas emission concentration of the system is ≤50mg / Nm as shown by the roaster flue gas online detection system 3 , can achieve emission standard.

Embodiment 3

[0029] Aluminum hydroxide roasting furnace with output of 1850t / h, the fuel is coal-made gas, and the flue gas volume is 210000Nm 3 / h, NOx concentration 400-520mg / Nm 3 , the amount of denitrification agent is 2.5-3.5 times the mass of NOx, and the solid-gas ratio in the agent injection system is 50:1 (kg-agent / kg-air). NO x The removal rate is more than 89%, and the flue gas emission concentration of the system is less than or equal to 100mg / Nm as shown by the roaster flue gas online detection system 3 , can achieve emission standard.

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Abstract

The invention discloses an aluminum hydroxide calcinator fume dry method denitration method, and relates to improvement on an aluminum hydroxide calcination method in the production process of aluminum oxide. The method is characterized by comprising the step of spraying a denitration agent into an aluminum hydroxide calcinator in a denitration process, wherein the pyrolysis product of the denitration agent is subjected to a reduction reaction with NOx in fume to reduce harmful gas NOx into harmless N2. Compressed air is utilized to directly spray the efficient dry method reducing denitrationagent into the calcinator to be mixed with the fume and reacted, so that the NOx concentration in the aluminum hydroxide calcinator fume achieves standard emission. The aluminum hydroxide calcinator fume dry method denitration method is low investment, high in efficiency, low in running cost, easy to operate, safe and stable, and free of secondary pollution.

Description

technical field [0001] A dry method for denitration of flue gas from an aluminum hydroxide roaster relates to an improvement of the aluminum hydroxide roasting method in the alumina production process. Background technique [0002] Since 2012, the compound annual growth rate of alumina production in my country has been 9.43%, while the compound annual growth rate of alumina in other parts of the world has been -3.66%, which makes the proportion of my country's alumina production in global production increase significantly trend. The "Alumina Industry Production and Sales Demand and Investment Forecast Analysis Report" released by the Prospective Industry Research Institute predicts that my country's alumina production will exceed 70 million tons in 2018. Air pollutants are inevitably emitted during alumina production. With the advancement of national environmental protection work, environmental protection standards are becoming more and more stringent. In 2013, the Ministr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/83B01D53/56F27D17/00
CPCB01D53/565B01D53/83B01D2251/206B01D2251/208B01D2258/0283F27D17/008
Inventor 刘万超李学鹏刘中凯练以诚雷树喜和新忠曹瑞雪李帅闫琨张朝普苏钟杨孙凤娟胡秋云
Owner GUIZHOU BRANCH CHINA ALUMINUM IND