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A combined denitrification system and method for alumina roasting flue gas

A technology of alumina and flue gas, which is applied in the direction of chemical instruments and methods, separation methods, combined devices, etc., can solve the problems of large temperature window influence, ammonia escape, etc., and achieve the effect of reducing usage, reducing impact, and reducing ammonia escape

Active Publication Date: 2019-04-02
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the application process of the SNCR method, however, the SCNR method is greatly affected by the temperature window, and there is a serious problem of ammonia escape.

Method used

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  • A combined denitrification system and method for alumina roasting flue gas

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Embodiment approach

[0029] A combined denitrification system for flue gas from alumina roasting. Along the flue gas flow direction, the combined denitrification system includes a roasting kiln sequentially connected through a flue gas channel, a three-stage cyclone separator, a two-stage cyclone separator, and a first-stage cyclone separator. The cyclone separator and the terminal dust collector, the wet raw material drying inlet is provided between the secondary cyclone separator and the primary cyclone separator, and the wet raw material drying inlet is provided between the secondary cyclone separator and the secondary cyclone separator The semi-dry raw material drying inlet, the dry raw material drying inlet is provided between the roasting kiln and the three-stage cyclone separator, and there is also an ammonia-containing gas inlet between the roasting kiln and the dry raw material drying inlet. The first purified gas inlet for the mixed gas with alcohol organic matter is also provided with th...

Embodiment 1

[0040] According to the combined denitrification system and method in the above embodiments, this example selects an alumina roasting kiln with an annual output of about 500,000 tons for denitrification experimental research. In flue gas, NO x The concentration is 500mg / m 3 , spray 5% ammonia gas at the high temperature of the boiler (about 1000 ° C temperature section), and spray 2% methanol gas after gasification as an additive at the same time; add a concentration of 200mg / m at the low temperature of the boiler feed 3 of ozone. The results show that NO is produced at the flue gas outlet of the alumina roasting kiln x The concentration is reduced to 100mg / m 3 Below, the existence of escaped ammonia can hardly be detected in the exhaust gas at the same time.

Embodiment 2

[0042] According to the combined denitrification system and method in the above embodiments, this embodiment also selects an alumina roasting kiln with an annual output of about 500,000 tons for denitrification experimental research. NO in flue gas x The concentration is 500mg / m 3 , spray 5% ammonia gas at the high temperature of the boiler (about 1000 ° C temperature section), and spray 5% ethanol gas after gasification as an additive at the same time; add a concentration of 250mg / m at the low temperature of the boiler feed 3 of ozone. The results show that NO is produced at the flue gas outlet of the alumina roasting kiln x The concentration is reduced to 100mg / m 3 Below, the existence of escaped ammonia can hardly be detected in the exhaust gas at the same time.

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Abstract

The invention relates to a combined denitrification system and method for alumina baked fuel gas. The combined denitrification system comprises the following steps: (1), a mixed gas containing gasified ammonia water and an alcohol organic matter is added into a high temperature section gas duct at the outlet of a roasting kiln from a first purified gas inlet, so as to remove part of nitric oxide from the flue gas; (2), ozone is added into a low temperature section gas duct from a second purified gas inlet, and the rest nitric oxide in the fuel gas is further converted to NO2; (3), wet raw materials enter into a gas duct from a wet raw material dry inlet, and then are changed to be half-dried raw materials and dried materials in sequence through fuel gas drying, during the wet raw material drying process, NO2 in the fuel gas is synchronously absorbed, and a secondary denitration effect is achieved. Compared with the prior art, the method provided by the invention has the advantages that the fuel gas denitrification effect is good, broadening a reaction temperature window is facilitated, the usage amount of ammonia gas in a conventional process is reduced, the ammonia escape frequency is reduced, and potential interference and the like caused on aluminium oxide products by ammonia can be avoided.

Description

technical field [0001] The invention relates to a combined denitrification system and method for alumina roasting flue gas, in particular to a combined denitrification system and method for alumina roasting flue gas by using lean ammonia SNCR reduction and ozone oxidation absorption. Background technique [0002] Nitrogen oxides, as a major pollutant in the atmosphere, have been increasing year by year with the increase in energy consumption in recent years, and the environmental problems brought about by them have also become increasingly prominent. As the national environmental protection policy restricts the emission of air pollutants more and more strictly, the emission reduction of nitrogen oxides is gradually implemented in laws and policies, and the nitrogen oxides produced in the production of various industries are strictly controlled. [0003] As the last process of alumina production, roasting aluminum hydroxide to produce alumina is a high energy-consuming produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/56B01D50/00
CPCB01D50/00B01D53/56B01D53/75B01D2251/104B01D2251/2062B01D2251/21B01D2251/604B01D2258/0283
Inventor 晏乃强瞿赞徐浩淼黄文君傅桂清吕廷娟
Owner SHANGHAI JIAOTONG UNIV
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