High-efficiency, low-emission, high-temperature, low-oxygen hot blast furnace

Abstract

A high-efficiency, low-emission, high-temperature, low-oxygen hot blast stove belongs to the technical field of hot blast stoves in the metallurgical industry. Including: hot blast stove, cut-off valve, regulating valve, gas pipe for hot blast stove, combustion air pipe for hot blast stove, high temperature mixed gas flue, low temperature flue, low temperature preheating system, gas main pipe from the pipe network, combustion air main pipe, Combustion fan for hot blast stove, flue after heat exchange, high temperature flue, flue after high temperature preheating, combustion air bypass duct, combustion air low temperature preheating duct, combustion air high temperature preheating duct. The advantage is that when only burning blast furnace gas, it can stably provide users with high-temperature hot air above 1250°C, effectively control the formation of NOx, and realize high-temperature and low-oxygen combustion; it is suitable for different metallurgical processes; it can be flexibly combined with existing hot blast stoves; It can be used in new construction and overhaul and renovation projects; it can be used in combination with various low-temperature preheating devices for combustion air and gas to fully recover waste heat from flue gas, improve thermal efficiency, and achieve high air temperature, high efficiency, low consumption, low NOx, and long life.

Description

technical field [0001] The invention belongs to the technical field of hot blast stoves in the metallurgical industry, and in particular provides a high-efficiency, low-emission, high-temperature, low-oxygen hot blast stove, which is suitable for 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] It has been nearly 200 years of history to use hot blast stove to heat blast in blast furnace ironmaking. After heating, the blast temperature is only 149°C at first. With the continuous advancement of technology, the current maximum wind temperature has reached 1350 °C. The increase of air temperature can greatly reduce the coke ratio, save coke, increase the output of blast furnace, and make full use of blast furnace gas with low calorific value, improve thermal efficiency, reduce gas emission, save energy ...

AI Technical Summary

Problems solved by technology

This technology is characterized by high combustion air preheating temperature and low oxygen content. Under this working condition, it burns with fuel. The combustion method is diffusion combustion. There is no local high temperature zone in the traditional combustion process, and the formation of NOx is suppressed.

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