Heat storage type combustion method for prolonging reversal time

Abstract

This invention discloses a heat storage type combustion method that increases direction changing time. It uses single heat storage type mode to preheat air and traditional metal heat exchanger mode topreheat coal gas. The waste gas in the furnace is divided into two parts and discharges out of furnace. One part passes through heat storage burner tip and preheats air. The other part is dischargedfrom furnace tail after passing the preheat billet of preheat segment. This part then enters into the metal heat exchanger to preheat coal gas. The occupied positions of coal gas and air heat storagechambers are all used as air heat storage chamber. The length of heat storage chamber is increased. The number of the heat storage bodies is increased. The direction changing time of heat storage burner tip is increased at the same time. This invention reduces the direction changing frequency and increases its life span. It also saves energy and reduces the difficulty of technique and operation control. This invention is fit for the heat storage type combustion technical innovation of the large-scale heating furnace which coal gas heat value is higher than 7000kJ / m3 and which furnace temperature is higher than 1000deg.C.

Description

technical field [0001] The invention relates to the technical field of regenerative combustion, in particular to a regenerative combustion method suitable for use in a large continuous high-temperature heating furnace with a furnace temperature higher than 1000°C. Background technique [0002] Regenerative technology has been widely used in industrial furnaces such as open hearth furnaces and soaking furnaces as early as the beginning of the last century. From the late 1980s to the early 1990s, with the development of regenerative materials and reversing equipment, regenerative combustion And high-temperature low-oxygen air combustion technology has been developed rapidly. [0003] At present, there are two main application methods of regenerative combustion technology. One is the regenerative burner using honeycomb body, and the other is the combustion device using small ball heat storage. In the actual preheating process, one is to use double storage burners. There is als...

AI Technical Summary

Problems solved by technology

The above method is currently widely used in heat treatment furnaces and some small heating furnaces, but it is not ideal for successful application in large-scale, continuous operation high-temperature heating furnaces.

[0004] Among them, the double heat storage method is used in "Analysis of the Application of High Temperature and Low Oxygen Air Combustion Technology in my country's Metallurgical Industry" (National Natural Science Foundation of China, Wu Guangliang, etc., the first author, School of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Ph.D candidate , "Steel and Steel" 2004 Volume 39 No. 9) It is proposed in the paper that the existing heat storage technology is suitable for mixed gas, blast furnace gas and converter gas (calorific value is 7000kJ / m 3 or below) generally adopts the double heat storage method of air and gas, and its shortcomings are: (1) It is difficult to control the furnace pressure and the atmosphere in the furnace, frequent flameout, furnace pressure fluctuations, and instantaneous negative pressure in the furnace; ( 2) Frequent inspection and maintenance and troubleshooting are required, and production must be stopped during this process; (3) The gas remaining in the pipeline is discharged with the flue gas during the reversing, which wastes fuel. question

[0005] However, single heat storage is currently widely used with the same reversing time, reversing method, and arrangement of heat storage bodies as double heat storage. At the same time, most furnaces no longer use gas heat exchangers after adopting heat storage technology. The unused heat is discharged from the side flue in vain, causing new waste