Control method for air-fuel ratio of pusher heat accumulating type heating furnace

Abstract

The invention discloses a control method for air-fuel ratio of a pusher heat accumulating type heating furnace, and aims to solve the problem of a conventional heat accumulating type heating furnace that the air-fuel ratio is not controlled. The control method is characterized in that a middle plate heat accumulating type heating furnace is divided into four combustion sections of a heating section I, a heating section II, a heating section III and a soaking section; the air-fuel ratio of the heating section I and the heating section II is 0.75 to 0.85; the air-fuel ratio of the heating section III is 0.70 to 0.80; and the air-fuel ratio of the soaking section is 0.70 to 0.75. According to the control method, through adjusting the ratio of air to gas in the heating furnace, full combustion of gas in the furnace is guaranteed, heat is effectively released, and the heating quality of billet steel is improved; through reasonably setting the air-fuel ratio, the amount of residual air in the furnace is decreased, the thickness of oxidized scales generated on the surface of the billet steel is decreased, the scale removing difficulty is reduced, the burning loss of the surface of the billet steel is reduced, and the yield of the billet steel is increased; and on the other hand, through optimizing the ratio, the fuel is fully and uniformly burnt, the energy consumption is reduced, the changing frequency of a heat accumulator is reduced, and the service cycle of the heating furnace is prolonged.

Description

Technical field [0001] The invention belongs to the field of regenerative heating furnaces, and specifically relates to a method for controlling the air-fuel ratio of a steel pushing regenerative heating furnace. Background technique [0002] At present, most steel products are still produced by hot rolling. The heating furnace is one of the main equipment in the hot rolling workshop. The energy consumption of the heating furnace accounts for more than 70% of the energy consumption of the rolling mill and is the main link of the energy consumption of the rolling mill. Therefore, how to improve the efficiency of the heating furnace and reduce the emission of harmful substances is the central topic of the rolling mill to reduce energy consumption and production costs, reduce environmental pollution, and improve the economic and social benefits of enterprises. [0003] The regenerative high-temperature air combustion technology (HTAC) that appeared in the early 1990s is a breakthrough...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a control method for the air-fuel ratio of the pusher regenerative heating furnace to solve the problem that the air-fuel ratio of the existing regenerative heating furnace cannot be controlled

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