Method for ultralow dust emission of heating furnace in low-temperature heat preservation state

Abstract

The invention relates to a method for ultralow dust emission of a heating furnace in a low-temperature heat preservation state. The method comprises the following specific steps of additionally arranging a variable-frequency fan on the heating furnace, and starting the variable-frequency fan in the low-temperature heat preservation state; adjusting the frequency of the fan to be below 33 Hz, and reducing the rotating speed of the fan to 950 rpm; reducing the jet velocity of a burner by over 20 percent, and enabling the burner to be in an oxygen-deficient combustion state; and after the parameters are adjusted, reducing the dust concentration by 0.5-1 mg / Nm<3>, reducing the oxygen content in flue gas to be below 19 percent, and performing flue gas emission of the heating furnace in the low-temperature heat preservation state. The method for the ultralow dust emission of the heating furnace in the low-temperature heat preservation state has the advantages that the method is convenient tooperate and control, the ultralow dust emission of the heating furnace in the low-temperature heat preservation state is realized, the heat preservation temperature of the heating furnace is reduced,and the method is environmental-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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