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A regenerative heating furnace and its flue gas circulation combustion method

A flue gas circulation and combustion method technology, which is applied in heat treatment furnaces, lighting and heating equipment, furnaces, etc., can solve the problems of uneven temperature of the slab out of the furnace, large degree of incomplete combustion, and large amount of oxidation burning loss. The pipeline and control system are simple, the effect of reducing oxidation and stabilizing combustion

Active Publication Date: 2017-06-23
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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Problems solved by technology

[0006] Aiming at the problems existing in current regenerative heating furnaces such as large oxidative burning loss, large degree of incomplete combustion, uneven temperature of the discharged slab and unstable furnace pressure, the present invention provides a regenerative heating furnace and its flue gas Cyclic combustion method to reduce oxidation loss and further improve thermal efficiency of regenerative heating furnace

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  • A regenerative heating furnace and its flue gas circulation combustion method

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Embodiment Construction

[0023] see figure 1 , the regenerative heating furnace is divided into four heating sections from right to left: preheating section, first heating section, second heating section and soaking section; all heating sections are centralized on the same side; Combustion-supporting air burners 3, 9 and gas burners 2, 8 are arranged symmetrically on the wall; between the heating sections of the conventional regenerative heating furnace, regenerative flue gas auxiliary burners 6 are respectively added to the two side walls of the heating furnace , 12. The flue gas auxiliary burners 6 and 12 on both sides of the furnace are arranged in pairs between each heating section, and the two burners are arranged opposite to the furnace width direction at a certain angle, and are respectively biased towards the adjacent heating sections. Gas burners, combustion-supporting air burners and flue gas auxiliary burners are all provided with gas burner regenerators 4,10, combustion-supporting air bur...

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Abstract

The invention relates to a regenerative heating furnace and a flue gas circulating combustion method thereof. On the basis of a conventional regenerative heating furnace, two regenerative heating furnaces are respectively installed between each heating section. Flue gas auxiliary burner. The entrance direction of the flue gas auxiliary burner is at a certain angle to the furnace width direction, and is biased towards the adjacent gas or combustion air burner; the outlet of the regenerator of the auxiliary burner is connected to the flue gas pipeline. During the operation of the heating furnace, part of the flue gas in the flue is drawn back, and sent to the furnace for secondary combustion through the auxiliary flue gas burner, and its flow direction is opposite to that of the combustion-supporting air and gas. The invention achieves the purpose of improving the energy utilization rate and reducing the oxidation burning loss rate through the recycling of flue gas.

Description

technical field [0001] The invention belongs to the technical field of regenerative heating furnace equipment and regenerative combustion, and relates to a regenerative heating furnace for rolling steel and a flue gas circulation combustion method suitable for the heating furnace. Background technique [0002] As a high-efficiency and energy-saving high-temperature air combustion technology, the regenerative combustion method has been widely used in industrial furnaces. Most of the new heating furnaces in the domestic metallurgical industry adopt this combustion method. At present, domestic regenerative heating furnaces mainly use blast furnace gas with low calorific value, and adopt the form of double preheating of air and gas. Mainly, its thermal efficiency is about 20% to 30% higher than that of conventional heating furnaces. However, because this combustion technology is not yet fully mature, some problems have been found in actual production, such as: [0003] (1) Sin...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/70F27D17/00
Inventor 杨丽琴孙林丁美良
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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