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An Improved Method for Reducing NOx Formation of Top Combustion Hot Blast Stove

A hot blast stove and top-firing technology, applied in the combustion field, can solve the problem of high NOx emissions, achieve low NOx generation, increase service life, and reduce stress corrosion effects

Active Publication Date: 2022-04-12
CISDI ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the purpose of the present invention is to provide an improved method for reducing the NOx generation of top-combustion hot blast stoves, so as to solve the higher problem of NOx emissions in existing top-combustion hot blast stoves

Method used

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  • An Improved Method for Reducing NOx Formation of Top Combustion Hot Blast Stove
  • An Improved Method for Reducing NOx Formation of Top Combustion Hot Blast Stove
  • An Improved Method for Reducing NOx Formation of Top Combustion Hot Blast Stove

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Embodiment 1

[0032] The improved method for reducing the amount of NOx produced by top-combustion hot blast stoves mainly includes the following steps:

[0033] (1) Optimize the structure of the ceramic burner in the top-fired hot blast stove: such as Figure 1 to Figure 3 As shown, along the axis OO' direction of the burner, the gas distribution channel 106 passing through the ceramic lining 101 forms a multi-layer gas nozzle 108 on the inner wall surface of the ceramic lining 101, and passes through the air distribution channel 107 of the ceramic lining 101 Form multi-layer air nozzles 109 on the inner wall surface of the ceramic lining 101, part of the air nozzles 109 and gas nozzles 108 are arranged on the same layer to form an empty coal mixed layer; change the size of the cross-sectional area of ​​the gas distribution channel 106 and the gas nozzles 108 of each layer Quantity, so that the gas flow of each layer is different; change the cross-sectional area size of the air distributio...

Embodiment 2

[0050] 1) First determine the number of gas nozzles according to the amount of gas. Assume that the total number of gas nozzles is 36, and there are three layers of gas nozzles from top to bottom. The number of gas nozzles on the first layer is 18, and the number of gas nozzles on the second layer is 9. , the number of gas nozzles on the third floor is 9. According to the numerical simulation, the total gas volume sprayed by the gas nozzles on each layer accounts for about 60%, 30%, and 10% respectively, and the opening sizes of the gas nozzles on the three layers are the same.

[0051] 2) Then determine the number of air nozzles according to the amount of air. The chemical equivalent ratio of air gas is about 0.63, and the total number of air nozzles is 24. There are also three layers of air nozzles from bottom to top, of which the number of air nozzles on the bottom layer is There are 12 air nozzles in the middle layer, 6 air nozzles in the middle layer, and 6 air nozzles in...

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Abstract

The invention relates to an improved method for reducing the amount of NOx produced by a top-combustion hot blast stove, which belongs to the field of combustion. The method includes (1) changing the size of the cross-sectional area of ​​the gas distribution channel and the number of gas nozzles in each layer, so that the gas flow rate of each layer is different; changing the size of the cross-sectional area of ​​the air distribution channel and the number of air nozzles in each layer, so that each (2) In the empty coal mixed layer, the total amount of gas flowing through the gas nozzle and the total amount of air flowing through the air nozzle are proportioned according to the non-stoichiometric ratio. This method can change the flow distribution of each layer of air gas nozzles by adjusting the number and cross-sectional size of the air gas nozzles of the burner. Under the premise, using rich-lean combustion technology and changing the ratio of rich-lean combustion can obtain lower NOx generation.

Description

technical field [0001] The invention belongs to the field of combustion, and in particular relates to an improved method for reducing the amount of NOx produced by a top-combustion hot blast stove. Background technique [0002] With the continuous development of blast furnace smelting technology, the demand for high blast temperature is becoming more and more urgent. High blast temperature is an important measure to reduce costs and increase efficiency. In order to obtain high blast temperature, the combustion temperature of the burner must also be continuously increased. Therefore, High combustion efficiency is also a requirement for the development of top-fired hot blast stove burners. However, the demand for high air temperature brings environmental protection problems, because the NOx emission in the combustion flue gas will increase accordingly. On the one hand, the high NOx emission cannot meet the increasingly stringent emission standards of the country. On the other ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B9/10
CPCC21B9/10
Inventor 王贤颜新罗志红徐灿唐耀杨艳张少魁
Owner CISDI ENG CO LTD
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