Control method and device for reducing nitrogen oxide content in heating furnace combusting waste gas

Abstract

The invention relates to the technical field of heating furnaces, in particular to a control method and device for reducing the nitrogen oxide content in the heating furnace combusting waste gas. Themethod comprises the steps that the current furnace temperature of a first furnace temperature control area in a heating furnace is acquired; it is judged whether the difference value of the current furnace temperature and the set target furnace temperature is greater than a first numerical value or not; if the different value is not greater than the first numerical value, the furnace temperatureof the first furnace temperature control area is adjusted to first set target temperature; and if the different value is greater than the first numerical value, the process target furnace temperatureis acquired, and after temperature adjustment of first set time is conducted on the first furnace temperature control area with the process target furnace temperature as the aim, the current furnace temperature is acquired again, wherein the process target furnace temperature is between the current furnace temperature and the set target furnace temperature. According to the control method for thereducing the nitrogen oxide content in the heating furnace combusting waste gas, when the current furnace temperature and the first set target furnace temperature differ much, the lower process targetfurnace temperature is used to conduct in-furnace multi-stage temperature adjustment so that the furnace temperature in the furnace temperature control area is stably adjusted to the set target furnace temperature, and the nitrogen oxide content generated when combustion is conducted in the heating furnace is reduced.

Description

technical field [0001] The invention relates to the technical field of heating furnaces, in particular to a control method and device for reducing the content of nitrogen oxides in combustion exhaust gas of heating furnaces. Background technique [0002] In the metallurgical industry, the heating furnace is the key equipment of the hot rolling production line, and the performance of the heated slab directly affects the slab rolling process and the quality of the finished product. Most of the existing heating furnaces are equipped with four heating zones along the route of the slab: the preheating heating section, the first heating section, the second heating section and the soaking heating section. A plurality of pulse burner burners are also set in each heating area, and the external air transmission pipeline and gas transmission pipeline are respectively connected to the pulse burner burner, and the combustion work of the burner burner is controlled by precise pulse. To a...

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Problems solved by technology

However, the high-temperature combustion of the heating furnace will produce nitrogen oxides. If the nitrogen oxides seriously exceed the standard, it will endanger the natural environment.

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