Full BF gas hot blast furnace

Abstract

The invention relates to a full blast furnace gas fired high blast temperature hot-blast stove, which belongs to the technical field of ironmaking hot-blast stove. The blast furnace gas fired high blast temperature hot-blast stove comprises an arch crown, a combustion chamber, checker bricks, a hot-blast outlet and other parts, and is characterized in that 4 to 20 pairs of pulse burners are arranged on the top of the hot-blast stove; each pulse burner consists of an air channel and a gas flue, wherein a honeycomb heat accumulator is arranged inside the air channel; the gas flue consists of a wall loop and a nozzle orifice; both air and gas are sprayed into the burner for mixed firing respectively; the gas flue and the air channel are arranged up and down or left and right at intervals or in the staggered form; the burners are arranged in a single row or in 2 to 4 rows; the air channel in the front of each burner is provided with a three-way change valve which is externally connected with two circular canals, wherein one circular canal is communicated with the air and the other circular canal is communicated with the gas. The blast furnace gas fired high blast temperature hot-blast stove has the advantages of realization of high blast temperature between 1,250 and 1,600 DEG C of the hot-blast stove, simple technological design, convenient assembly of burner nozzles, small occupied space, low investment cost and reduction of pollution.

Description

technical field [0001] The invention belongs to the technical field of ironmaking hot blast stoves, and in particular provides a full-fired blast furnace gas high blast temperature hot blast stove, which adopts a honeycomb regenerator and pulse combustion technology to realize a hot blast auxiliary device with a blast temperature of 1250-1600°C. technical background [0002] At home and abroad, the technologies for achieving high air temperature mainly include blending high-calorific value gas technology, heat exchanger preheating gas combustion-supporting air technology, hot blast furnace self-preheating technology, high-temperature air combustion preheating technology, etc. Now, the problems existing in steel companies are The coke oven gas is insufficient or lacking, while the blast furnace gas is facing surplus and release. Therefore, how to use a single blast furnace gas to achieve a blast temperature above 1250°C in the hot blast stove is a topic of concern to many iron...

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Problems solved by technology

[0002] At home and abroad, the technologies for achieving high air temperature mainly include blending high-calorific value gas technology, heat exchanger preheating gas combustion-supporting air technology, hot blast furnace self-preheating technology, high-temperature air combustion preheating technology, etc. Now, the problems existing in steel companies are The coke oven gas is insufficient or lacking, while the blast furnace gas is facing a surplus and release. Therefore, how to use a single blast furnace gas to achieve a blast temperature above 1250°C in the hot blast stove is a topic of concern to many iron and steel enterprises

Using heat exchanger preheating gas and combustion air technology, the gas temperature can reach 180°C after preheating; in order to achieve 1250°C air temperature, the combustion air needs to be preheated to about 400-600°C, which cannot be achieved by using conventional heat pipe heat exchangers To meet this requirement; the air temperature of 1250°C can be achieved by using the self-preheating method of the hot blast stove, but because most of the high-temperature air volume generated is used for preheating, the design of the hot blast stove is at least twice as large, and the investment cost is high. The air combustion preheating technology increases the investment of at least two preheating furnaces, and increases the floor area at the same time

[0003] At home and abroad, there are methods of using regenerative technology to achieve high wind temperature. Generally, the regenerative furnace is used to preheat air or gas, and the integrity of the high wind temperature furnace cannot be guaranteed.

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