A Multipurpose High Temperature Preheating System for Hot Blast Stove

Abstract

The utility model relates to a multipurpose high-temperature preheating system for a hot blast stove, which belongs to the technical field of hot blast stoves in the metallurgical industry. Including: hot blast stove, flue gas stove, air heat exchanger, gas heat exchanger, chimney, cut-off valve, regulating cut-off valve, gas inlet pipe, gas main pipe into heat exchanger, gas main pipe out of heat exchanger, gas bypass pipe , gas pipe after preheating, gas pipe into flue gas furnace, combustion fan, air main pipe, air main pipe into heat exchanger, air main pipe out of heat exchanger, air bypass pipe, air pipe after preheating, combustion fan of flue gas furnace , Into the flue gas furnace air pipe, hot blast furnace flue, into the flue gas furnace low temperature flue, out of the flue gas furnace high temperature flue, out of the air heat exchanger flue, into the gas heat exchanger flue, out of the gas heat exchanger Flue, flue gas bypass pipe, flue gas main pipe, inspection pipe, front inspection pipe of induced draft fan, flue gas induced draft fan, front suction pipe of induced draft fan, rear inspection pipe of induced draft fan, rear exhaust pipe of induced draft fan, hot air pipe , hot air valve. The advantage is that the full combustion of blast furnace gas can obtain a high temperature of 1280°C, which realizes the efficient utilization of low-quality energy, and also meets the different maintenance needs of hot blast stoves, greatly improving the on-site response speed.

Description

technical field [0001] The invention belongs to the technical field of hot blast stoves in the metallurgical industry, and in particular provides a multipurpose hot blast stove high-temperature preheating system, which is suitable for hot blast stoves used in blast furnace ironmaking and smelting reduction ironmaking in the ironmaking process. It can also be used in other industrial technical fields that need to heat the gaseous medium to above 1000°C. Background technique [0002] With the continuous development of large-scale blast furnaces, the air temperature level required by blast furnaces is also getting higher and higher, so as to increase the coal injection ratio and save valuable coke. However, domestic iron and steel plants generally lack gas with high calorific value. In order to achieve an air temperature above 1250°C under the condition of single-burning blast furnace gas, the air or gas must be preheated. The calorific value of blast furnace gas is about 3300...

AI Technical Summary

Problems solved by technology

If the blast furnace is shut down for a long time for maintenance, the heat in the regenerator of the hot blast stove will gradually conduct downwards, causing the temperature of the grate to rise continuously. If the high temperature limit is exceeded, the strength of the grate will drop rapidly, causing the regenerator The serious consequences of the collapse

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