Combustion heat load distribution control method of csp thin slab roller hearth tunnel heating furnace

Abstract

The invention discloses a combustion heat load distribution control method of a CSP sheet billet roller bottom type tunnel heating furnace. The heating furnace comprises a heating section, a soak section, a swing section and a public holding section. According to the method, heat loads of combustion nozzles of the heating section, the soak section, the swing section and the public holding section are controlled. According to the combustion heat load distribution control method, the mixed combustion time of air and gas injected by the combustion nozzles is prolonged; the combustion efficiency and high-temperature combustion gas heat efficiency are improved; incomplete combustion heat losses and heat losses of discharge smoke are reduced; damage of secondary combustion to a heat exchanger is reduced; and finally the aims of reducing secondary combustion in a flue, reducing energy consumption of the heating furnace, improving the sheet billet heating quality, prolonging the service life of the heat exchanger and the like are achieved.

Description

technical field [0001] The invention relates to the field of heating furnaces, in particular to a method for controlling combustion heat load distribution of a CSP thin slab roller hearth tunnel heating furnace. Background technique [0002] Roller hearth tunnel heating furnace for thin slab heating in CSP production line mainly has three functions: [0003] 1) The heating and soaking function of the slab continuously receives the high-temperature slab produced by the casting machine. After heating and soaking, the thin slab that meets the quality requirements is supplied to the rolling mill in time: [0004] 2) Buffering function, when the rolling mill is in normal production and the work roll is changed or the downstream equipment fails to roll the slab due to temporary failure, the roller hearth furnace can still accept the slab within a certain period of time, which plays the role of adjusting buffer, that is, in the "rigid" casting machine and The "flexible" buffer lin...

AI Technical Summary

Problems solved by technology

[0007] Due to the special structural features of the roller hearth tunnel heating furnace in the CSP production line, burners are arranged directly above or on both sides of the furnace bottom smoke outlet in each section. Due to the furnace temperature control technology in which each section is divided into multiple zones, resulting in The combustion load of each burner is evenly distributed, so that the air gas injected by the burner directly above the smoke exhaust port at the furnace bottom of each section is not mixed and burned in time and then sucked into the smoke exhaust port, causing the unburned air gas to be combusted in the flue. , not only causes waste of energy, but also causes the air in the flue and the temperature of the flue gas at the inlet of the gas heat exchanger to exceed the temperature, resulting in high temperature damage to the heat exchanger, abnormal combustion control of the heating furnace, and incorrect execution of the slab heating process, forcing the furnace to be shut down overhaul

In addition, due to the narrow height and width of the space in the heating furnace, once the mixing characteristics of the burner deteriorate, it will inevitably lead to incomplete combustion in the furnace, difficulty in controlling the combustion atmosphere in the furnace, or even failure, which will not only cause incomplete combustion heat loss, but also increase The risk of secondary combustion in the flue and high-temperature damage to the heat exchanger also greatly reduces the heating quality in the billet furnace, seriously affects the final quality of hot-rolled products, and even produces waste products

[0008] It can be seen that, under the conditions of the existing roller hearth tunnel heating furnace equipment and control technology of the CSP production line, there is still room for further research and improvement on how to avoid the series of problems caused by incomplete combustion in the furnace

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