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A method for ultra-low dust emission of heating furnace under low temperature and heat preservation state

A technology of heating furnace and state, applied in the field of steel rolling heating furnace, can solve the problems of dust emission exceeding the standard and difficult to control, etc., and achieve the effects of ultra-low emission, lower holding furnace temperature, and easy operation and control

Active Publication Date: 2022-03-01
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for ultra-low dust emission of heating furnaces under low temperature and heat preservation conditions, which can reduce the dust concentration in the flue gas, in order to solve the problem that the dust emission of the existing heating furnace is easy to exceed the standard and is difficult to control under the low temperature and heat preservation state. and oxygen content, saving energy and reducing the total amount of flue gas emissions

Method used

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  • A method for ultra-low dust emission of heating furnace under low temperature and heat preservation state
  • A method for ultra-low dust emission of heating furnace under low temperature and heat preservation state

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Embodiment 1

[0021] In order to make the present invention clearer, a method of the present invention for ultra-low dust emission from heating furnaces under the state of low-temperature heat preservation will be further described below in conjunction with the accompanying drawings. The specific embodiments described here are only used to explain the present invention and are not intended to to limit the present invention.

[0022] Such as figure 1 As shown, a method for ultra-low dust emission of heating furnaces under low temperature and heat preservation conditions, the device used includes a frequency conversion fan or a power frequency fan, the specific steps are as follows, and it is characterized in that it includes:

[0023] (1) Enable the frequency conversion fan: install a frequency conversion fan on the heating furnace, turn off the power frequency fan, and turn on the frequency conversion fan in the low temperature and heat preservation state;

[0024] (2) Frequency conversion...

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Abstract

The invention relates to a method for ultra-low dust emission of a heating furnace in a low temperature heat preservation state. The specific steps include adding a variable frequency fan on the heating furnace, and turning on the variable frequency fan in a low temperature heat preservation state; adjusting the frequency of the fan to below 33 Hz, The fan speed is reduced to 950rpm; the injection speed of the burner is reduced by more than 20%, and the burner is in a state of oxygen-deficient combustion; after adjusting the above parameters, the dust concentration drops by 0.5~1 mg / Nm 3 , the oxygen content in the flue gas is reduced to less than 19%, and the flue gas emission of the heating furnace under low temperature heat preservation can be carried out. The advantages of the invention are that it is easy to operate and control, realizes ultra-low dust emission of the heating furnace in a low-temperature heat preservation state, reduces the heat preservation temperature of the heating furnace itself, and is environmentally friendly and energy-saving.

Description

technical field [0001] The invention relates to the technical field of steel rolling heating furnaces, in particular to a method for ultra-low dust emission of heating furnaces in a low-temperature heat preservation state. Background technique [0002] Under the requirements of environmental protection, an online flue gas composition analyzer is installed on the chimney of the steel rolling heating furnace, and realizes network monitoring, mainly monitoring the content of dust, sulfide and nitrogen oxides in the flue gas. The conversion formula is as follows: [0003] C 折 =C 实 ×(21-8) / (21-O 实 ) [0004] The fuel of the original steel rolling heating furnace is high-coke-to-mixed gas, and the original design is two power frequency fans, one for use and one for standby. When the steel rolling production line is shut down for maintenance, the heating furnace needs to be cooled and kept warm. During the cooling and heat preservation stage of the heating furnace, the dust in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D17/00F27D19/00
CPCF27D17/008F27D19/00F27D2019/0028
Inventor 徐永圣
Owner NANJING IRON & STEEL CO LTD
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