Multipurpose hot blast stove high-temperature preheating system

Abstract

The invention discloses a multipurpose hot blast stove high-temperature preheating system and belongs to the technical field of hot blast stoves of the metallurgical industry. The multipurpose hot blast stove high-temperature preheating system comprises a hot blast stove, a gas stove, an air heat exchanger, a gas heat exchanger, a chimney, a stop valve, a regulating stop valve, a gas inlet pipe, an inlet heat exchanger gas header pipe, an outlet heat exchanger gas header pipe, an air by-pass pipe, a preheated gas pipe, an inlet gas stove gas pipe, a combustion-supporting blower, an air header pipe, an inlet heat exchanger air header pipe, an outlet heat exchanger air header pipe, an air by-pass pipe, a preheated air pipe, a gas stove combustion-supporting blower, an inlet gas stove air pipe, a hot blast stove flue, an inlet gas stove low-temperature flue, an outlet gas stove high-temperature flue, an outlet air heat exchanger flue, an inlet gas heat exchanger flue, an outlet gas heat exchanger flue, a gas by-pass pipe, a gas header pipe, a maintenance pipe, a front inducting blower maintenance pipe, a gas inducing blower, a front inducting blower sucking pipe, a rear inducting blower maintenance pipe, a rear inducting blower exhausting pipe, a hot blast pipe and a hot blast valve. The multipurpose hot blast stove high-temperature preheating system has the advantages that the high wind temperature of 1280 DEG C can be reached through blast stove gas; the efficient utilization of low-quality energy is achieved, and different maintenance demands for the hot blast stove are also met; the on-site reaction speed is greatly increased.

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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