Efficient low-emission high-temperature low-oxygen hot blast stove

Abstract

The invention discloses an efficient low-emission high-temperature low-oxygen hot blast stove and belongs to the technical field of hot blast stoves in the metallurgical industry. The efficient low-emission high-temperature low-oxygen hot blast stove comprises a hot blast stove body, a stop valve, a regulating valve, a gas pipeline for the hot blast stove body, a combustion-supporting air pipeline for the hot blast stove body, a high-temperature mixed gas flue, a low-temperature flue, a low-temperature preheating system, a gas header pipe from a pipe network, a combustion-supporting air header pipe, a combustion-supporting blower for the hot blast stove body, a heat exchanged flue, a high-temperature flue, a high-temperature preheated flue, a combustion-supporting air by-pass pipeline, a combustion-supporting air low-temperature preheating pipeline and a combustion-supporting air high-temperature preheating pipeline. The efficient low-emission high-temperature low-oxygen hot blast stove has the advantages that when only blast stove gas is burnt, high-temperature hot-blast air with the temperature being above 1250 DEG C can be stably provided for users; the generation of NOx is effectively controlled; the high-temperature low-oxygen combustion is achieved; the efficient low-emission high-temperature low-oxygen hot blast stove is suitable for different metallurgical technological processes, and capable of being flexibly combined with existing hot blast stoves, being used for new projects and overhaul modification projects, and being combined with various low-temperature preheating devices of combustion-supporting air and gases for use; the exhaust gas afterheat is fully recovered; the heat efficiency is improved; the high blast temperature, high efficiency, low consumption, low content of NOx and long service life are achieved.

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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