Method for guaranteeing high blast temperature by using blast furnace gas

Abstract

The invention discloses a method for guaranteeing high blast temperature by using blast furnace gas, and belongs to the technical field of utilization of blast furnace gas of iron making and combustion of hot-blast furnaces. The method is particularly suitable for being used under the conditions that high heating value gas is in short, and blast furnace gas is rich. The method aims to solve the problem that high blast temperature cannot be guaranteed due to low heating value of the blast furnace gas, and an additional combustion furnace is adopted to guarantee the high blast temperature, and the blast furnace gas is comprehensively utilized; and the method comprises the steps of: utilizing the residual heat of the blast furnace gas, removing dust by a dry method, and performing pressure swing adsorption and mixing and combusting to guarantee high blast temperature. The residual heat of the blast furnace gas and the residual heat produced after the dust is removed by the dry method are used for heating air from an air blower, and the heated air is used as combustion air for combustion of the hot blast furnace and cold air blast at an inlet of the hot-blast furnace; the low heating value blast furnace gas which is obtained after the dust is removed by the dry method and of which the volume proportion is 10 to 40 percent is cooled to enter a pressure swing adsorption device, so that the low heating value blast furnace gas is changed into the high heating value gas, and the high heating value gas and low heating value blast furnace gas obtained after top pressure power generation is mixed and combusted; and under the condition that a hot-blast furnace system is not provided with the additional combustion furnace, the hot blast at the high temperature of between 1,250 and 1,350 DEG C can be provided for a blast furnace for use.

Description

technical field [0001] The invention relates to the technical field of iron-making blast furnace hot blast stoves in the iron and steel industry, in particular to a method for efficiently utilizing blast furnace gas to achieve high blast temperature, which is used when there is a shortage of high calorific value gas and only a surplus of blast furnace gas. Background technique [0002] The iron and steel industry is a high-pollution and high-energy-consuming industry dominated by petrochemical fuels. Its energy consumption accounts for about 25% of the total industrial energy consumption. It is the focus of industrial energy conservation. Making full use of various energy resources is an important way to further reduce energy consumption in steel production . Blast furnace gas is a by-product of iron and steel enterprises. Due to its low calorific value, there is more or less radiation. Therefore, how to efficiently use blast furnace gas is a topic of concern to many iron an...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for using blast furnace gas to achieve high blast temperature, to solve the problems in the prior art that high blast temperature cannot be realized due to the low calorific value of blast furnace gas and the need to preheat combustion-supporting air in order to achieve high blast temperature.

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