Method for using blast furnace gas to heat of large-scale walking beam type plate blank heating furnace

Abstract

The invention relates to a large-scale walking-beam type slab heating furnace which adopts a blast furnace gas heating method, and belongs to the technology field of a heating furnace. A plate blank steps from a furnace feeding end to a furnace discharging end through a walking beam, and passes through a preheating section, a first heating section, a second heating section, a third heating section and a soaking section; the heating temperature of each heating section is controlled according to the heating technology requirements of various steel grades; the quantity of stored-heat burners which are arranged in the corresponding heating sections is controlled; after the stored-heat burners are arranged in the position of each heating section, blast furnace gas and air respectively pass through refrigerating chambers of the stored-heat burners and are processed through thermal storage until the temperature reaches 800 to 1000 DEG C, and then enter the furnace for fully burning, thereby realizing the heating of the plate blank; when flue gas passes through the refrigerating chambers of the stored-heat burners, the heat of the flue gas is absorbed fully; the whole heating process is completed through alternate burning and exhaustsmoke of the stored-heat burners which are arranged on two sides of the heating furnace. The large-scale walking-beam type slab heating furnace has the advantages that the stored-heat heating technology is utilized to reduce the exhaust of NOx compound dusty gas greatly, and the energy-saving and environment-protecting effects are obvious.

Description

technical field [0001] The invention belongs to the technical field of heating furnaces, and in particular provides a method for heating large-scale walking beam slab heating furnaces using blast furnace gas, which is applied to heating slabs in wide and thick slab engineering and saves a lot of energy. Background technique [0002] Regenerative technology is a new generation of advanced combustion technology developed rapidly in the 1990s in the world. It has many advantages such as high efficiency, high quality, energy saving and low pollution emission. combustion technology. As early as the mid-19th century, it began to be used in large-scale and high-temperature furnaces such as blast furnaces, hot blast stoves, and coke ovens. The long cycle time limits the application in other industrial furnaces. [0003] In 1982, the British Hot Work Development Company cooperated with the British Gas Research Institute to successfully develop the first new regenerative heating fur...

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Problems solved by technology

[0005] Shouqin Company’s 4300mm wide and thick plate rolling mill project supporting heating furnace, the original conventional heating furnace is designed to use natural gas and blast furnace gas to form a calorific value of 2200kcal / Nm 3 The mixed gas is used as fuel, and the hourly natural gas consumption of the two heating furnaces reaches 7300Nm3 / h. The geographical location of Shouqin Company has no available natural gas pipelines, and the use of purchased natural gas as fuel will inevitably increase costs, and the natural gas transported by tank trucks cannot To meet the large amount of natural gas consumption requirements on site, and more importantly, whether the external can guarantee long-term and stable supply of natural gas for industrial use, there are also uncertain factors

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