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

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...

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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

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