Blast furnace gas desulfurization purification system and method

Abstract

The invention relates to a blast furnace gas desulfurization purification system and method. The system comprises a heating device, an alkali spraying tower, a sintering device and a plurality of adsorption towers, wherein each adsorption tower is filled with a purification medium, a gas inlet of each adsorption tower is connected with a gas outlet of a TRT in an on-off manner, and a gas outlet of each adsorption tower is connected with a purified gas user in an on-off manner; a regeneration gas outlet of the heating device is connected with a gas outlet of each adsorption tower in an on-off manner, and the regeneration gas introduced into the adsorption towers is heated through the heating device; a gas inlet of the alkali spraying tower is connected with a gas inlet of each adsorption tower, and a gas outlet of the alkali spraying tower is connected with a gas inlet of each adsorption tower; a gas inlet of the sintering device is connected with gas inlets of the adsorption towers, and a heat source outlet of the sintering device is connected with a heat source inlet of the heating device. The technical problems of poor blast furnace gas purification effect and high investment cost are solved.

Description

technical field [0001] The invention relates to the technical field of gas desulfurization, in particular to a blast furnace gas desulfurization purification system and method. Background technique [0002] Blast furnace gas is the main by-product produced in the ironmaking process, and it is a colorless, odorless, combustible gas. The theoretical combustion temperature is 1400-1500°C, and the ignition point is about 700°C. Blast furnace gas is characterized by low calorific value (3300~4200kJ / Nm 3 ), the gas production is large, and it is easy to explode when mixed with air. The main components of blast furnace gas are: CO 25%-30%; H 2 1.5%~3.0%;CH 4 0.2%~0.5%;N 2 55%~60%; CO 2 9%~12%;O 2 0.2% to 0.4%. [0003] In the past ten years, with the general application of blast furnace gas dry bag dust removal and blast furnace gas residual pressure turbine power generation (TRT), the pressure energy and heat energy of blast furnace gas have been fully recovered. Aft...

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Problems solved by technology

The traditional desulfurization method is to desulfurize coal gas, mainly using calcium method, magnesium method, sodium method, ammonia method, organic alkali method and other processes, but compared with blast furnace gas, the volume of gas after combustion increases, the temperature is high, and the pressure is low , which will lead to a large gas desulfurization device and large water consumption, and the circulating water needs to be treated separately, which has the disadvantages of high desulfurization cost and secondary pollution.

The method for treating the source of blast furnace gas is mainly to adopt the traditional wet scrubbing desulfurization after the residual pressure turbine power generation device, where H 2 S, SO 2 etc. are easy to remove, while COS and CS in blast furnace gas 2 etc. are not easy to remove, which leads to SO in the gas after blast furnace gas combustion 2 The content is still exceeding the standard

[0004] At this stage, although there are many desulfurization methods for blast furnace gas, they all have the disadvantages of large equipment scale, high investment cost and inability to completely remove sulfide in the gas. Economical and easy method and equipment

[0005] For the problems of poor blast furnace gas purification effect and high investment cost in related technologies, no effective solution has been given so far

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