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Improved method for reducing NOx production amount of top-combustion type hot-blast stove

A hot blast stove, top combustion technology, applied in the field of combustion, can solve the problem of high NOx emissions, achieve the effect of reducing stress corrosion, reducing NOx emissions, and improving service life

Active Publication Date: 2020-11-20
CISDI ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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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  • Improved method for reducing NOx production amount of top-combustion type hot-blast stove
  • Improved method for reducing NOx production amount of top-combustion type hot-blast stove
  • Improved method for reducing NOx production amount of top-combustion type hot-blast stove

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Embodiment 1

[0033] The improved method for reducing the amount of NOx produced by top-combustion hot blast stoves mainly includes the following steps:

[0034] (1) Optimizing 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 distribut...

Embodiment 2

[0051] 1) First determine the number of gas nozzles according to the amount of gas, assuming that the total number of gas nozzles is 36, 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 out by the gas nozzles in each layer accounted for about 60%, 30%, and 10%, respectively, and the opening sizes of the gas nozzles in the three layers were the same.

[0052] 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 can be obtained as 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, ...

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Abstract

The invention relates to an improved method for reducing the NOx production amount of a top-combustion type hot-blast stove, and belongs to the field of combustion. The method includes the steps that(1) the sectional area sizes of coal gas subchannels and the number of coal gas nozzles of all layers are changed so that the coal gas flow rate of each layer can be different, and the sectional areasizes of air subchannels and the number of air nozzles of all the layers are changed so that the air flow rate of each layer can be different; and (2) the total amount of coal gas flowing through thecoal gas nozzles and the total amount of air flowing through the air nozzles are matched according to the non-chemical equivalence ratio in an air and coal mixing layer. By adoption of the method, theflow rate distribution amount of the air and coal gas nozzles of each layer can be changed by adjusting the number, the sectional area sizes and the like of the air and coal gas nozzles of a burner;and meanwhile, the dense-lean combustion proportion is changed by adoption of the dense-lean combustion technology without influencing sufficient combustion of the entire fuel energy through the localair and coal gas non-chemical equivalence matching, and the low NOx production amount can be obtained.

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] At the end of the 1980s, the Shougang type top-fired hot blast stove began to be put into operation in large blast furnaces. At the same time, the top-fired hot blast stove represented by the Russian Kalukin type was gradually popularized and applied in Russia, Ukraine and China. ; Among them, Caofeidian in my country is 5000m 3 And Japan JFE3200m 3 It is represented by the application of top-fired hot blast stoves in super-large blast furnaces. [0003] 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 o...

Claims

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Application Information

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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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