High-temperature low-oxygen external combustion stove

Abstract

The invention relates to a high-temperature low-oxygen external combustion stove, belonging to the technical field of hot-blast stoves. The high-temperature low-oxygen external combustion stove comprises a cold air inlet, a grate, a supporting column, checker bricks, a heat accumulation chamber, a stove lining, a stove shell, a high-temperature low-oxygen combustor, a combustion chamber, an arch crown, a hot air outlet and a smoke outlet, wherein the combustion chamber and the heat accumulation chamber of the external combustion stove are respectively positioned in two independent cylindrical shells; the combustion chamber is connected with the heat accumulation chamber through a cylindrical channel in the space of the arch crown; the high-temperature low-oxygen combustor for fractional combustion is arranged at the bottom of the combustion chamber; the high-temperature low-oxygen combustor comprises two groups of gas inlets, loops and spouts, two groups of air inlets, loops and spouts, and an air and gas precombustion chamber; and combustion-supporting air of which the temperature is higher than 800 DEG C entrains combustion products through fractional combustion and high-temperature air flow in the high-temperature low-oxygen combustor to dilute the oxygen-containing volume concentration of a reaction zone. The invention is suitable for hot-blast stoves used for blast furnace ironmaking and smelting reduction ironmaking in ironmaking industries or other industrial technical fields in which the gaseous medium needs to be heated to the temperature higher than 1000 DEG C.

Description

technical field [0001] The invention belongs to the technical field of hot blast stoves, and provides a high-temperature, low-oxygen external combustion type hot blast stove, which is suitable for blast furnace ironmaking and smelting reduction ironmaking in the ironmaking industry. 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 since hot blast stoves were used to heat the blast in the blast furnace ironmaking process, and the blast temperature was only 149°C after the initial heating. With the continuous advancement of technology, the current maximum wind temperature has reached 1300 ℃. Increasing the air temperature can greatly reduce the coke ratio, save coke, increase the output of the blast furnace, and make full use of the blast furnace gas with low calorific value, improve energy utilization efficiency, reduce gas emission, save energy, and prote...

AI Technical Summary

Problems solved by technology

With the increase of vault temperature, NO X The formation of the steel will be sharply accelerated, causing a series of problems such as intergranular stress corrosion of the furnace shell and environmental pollution.

Therefore, the existing conventional hot blast stove generally controls the temperature of the vault below 1420°C, thus limiting the further increase of the air temperature

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