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Coking furnace heating method and device capable of reducing generation of NOx

A heating device and heating method technology, which are applied to the heating of coke ovens, coke ovens, combustible gas heating coke ovens, etc. Effects of heat loss and NOx reduction

Inactive Publication Date: 2016-12-07
HUNAN QIANMENG INTELLIGENT INFORMATION TECHCO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For small and medium-sized coke ovens that have been in operation for many years, due to the limitations of established conditions such as furnace body structure and heating methods, the method of reducing NOx by heating in stages has not been popularized, resulting in high costs for denitrification technology that meets environmental protection requirements

Method used

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  • Coking furnace heating method and device capable of reducing generation of NOx
  • Coking furnace heating method and device capable of reducing generation of NOx
  • Coking furnace heating method and device capable of reducing generation of NOx

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Embodiment

[0041] After the coke oven is heated and exchanged, the coke oven gas sprayed from the bottom to the top burns at the bottom of the vertical fire channel 3, that is, a section of combustion. The biggest feature of combustion in this area is that the ratio of air and gas is 70%-80%. The insufficient combustion reduces the flame temperature and inhibits the generation of thermal nitrogen oxides. A part of the unburned coke oven gas is burned for the second time on the upper part of the updraft vertical fire 3 with the air supplied from the adjustable air inlet flap 19 on the top of the furnace. The adjustable air inlet flap 19 is arranged in the fire viewing hole. On the hole cover of 18, a flap or manual adjustment valve is installed inside to adjust the air flow, and the air inlet flap 19 (such as image 3 shown). The cross-sectional area of ​​the air inlet is adjusted through the middle rotating shaft of the adjustable air inlet flap 19. The supplied air exchanges heat with ...

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Abstract

The invention provides a coking furnace heating method and device capable of reducing generation of NOx. Vertical flues are double connected, coal for coking is put in a carbonization chamber and refined to be coke, coking furnace gas is downwards injected, air is supplied to the vertical flues in a segmented manner and mixed with the coking furnace gas for combustion, waste gas after segmented combustion enters each downdraft vertical flue after being turned through a crossing hole, and complete combustion is performed at the top of the downdraft vertical flue; after complete combustion, the waste gas enters an adjacent heat storage chamber through inclined channels of the downdraft vertical flues and exchanges heat with lattice bricks, the cooled waste gas enters a small flue through adjustable grate holes, and finally, the waste gas is discharged through a branch flue, a main flue and a chimney. Segmented combustion of coking furnace gas can be realized, adjustment is performed according to the combustion condition, the coke quality is improved, heat loss is reduced, the heat efficiency is improved, high temperature points in the vertical flues are reduced, generation of NOx is reduced, and environmental protection is realized.

Description

technical field [0001] The invention relates to the technical field of metallurgical coking, in particular to a coke oven heating method and device for reducing NOx generation. Background technique [0002] The formation mechanism of nitrogen oxides in the combustion process can be divided into three types: (1) thermodynamic NOx formed at high temperature; (2) transient NOx formed by carbon-containing radicals in low temperature flame; (3) fixed nitrogen formation in fuel The NOx is fuel-type NOx. In general, coke ovens mainly use coke oven gas, blast furnace gas or a mixture of the two as a heat source for dry distillation of coal. Coke oven gas heating is currently used by most coke ovens due to its advantages of fast combustion speed, less gas required, and low heat consumption for coking. However, due to the high local temperature of the combustion flame, it is also the main source of thermal nitrogen oxides. [0003] The combustion temperature has a decisive effect on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B21/10
CPCY02P20/129C10B21/10
Inventor 何高明陈勇波邹婵盛荣芬昌立刚
Owner HUNAN QIANMENG INTELLIGENT INFORMATION TECHCO LTD
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