Low-cost and high-efficiency blast furnace gas desulfurization method

Abstract

The invention relates to the technical field of blast furnace gas desulfurization, and in particular, relates to a low-cost and high-efficiency blast furnace gas desulfurization method. The low-cost and high-efficiency blast furnace gas desulfurization method provided by the invention comprises the following steps: a, conveying raw coal to powder making equipment through conveying equipment to be ground and dried to form pulverized coal; b, conveying the pulverized coal to coal injection equipment, injecting the pulverized coal into a blast furnace for combustion, adding a desulfurizing agent before the pulverized coal is injected into the blast furnace, mixing the pulverized coal and the desulfurizing agent to form mixed powder, and injecting the mixed powder into the blast furnace for combustion through the coal injection equipment, or injecting the desulfurizing agent into the blast furnace through another set of coal injection equipment before the pulverized coal is combusted, mixing and combusting the pulverized coal and the desulfurizing agent, and injecting the desulfurizing agent and the pulverized coal into the blast furnace together for desulfurization. Therefore, the use of subsequent desulfurization equipment is reduced, and the desulfurization cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of blast furnace gas desulfurization, in particular to a low-cost and high-efficiency blast furnace gas desulfurization method. Background technique [0002] Blast furnace gas is a by-product of the blast furnace ironmaking process. It is a gaseous fuel with low calorific value. It can be used for self-use gas in metallurgical enterprises, such as heating hot-rolled steel ingots, preheating ladles, etc., and can also be supplied to civilian use, blast furnaces The gas contains a large amount of dust and sulfide, and the emission of sulfur dioxide in the untreated blast furnace gas exceeds the standard, which is extremely harmful to the human body. [0003] The existing blast furnace gas desulfurization process generally adopts wet desulfurization and dry desulfurization, both of which are desulfurized after the blast furnace gas is discharged from the blast furnace through multiple equipment and processes, a...

AI Technical Summary

Problems solved by technology

[0004] The patent document with the patent number "2013106553901" discloses the addition and application of a desulfurizing agent in the process of blast furnace ironmaking. The desulfurizing agent is added to the coal powder before coal grinding, so that the desulfurizing agent is in the process of pulverized coal grinding. For mixing, the mixed powder of desulfurizer and coal powder is sprayed into the blast furnace through the tuyere of the blast furnace, so that the desulfurizer desulfurizes the molten iron in the blast furnace, thereby reducing the cost of blast furnace ironmaking and [S] in pig iron However, the blast furnace gas produced in the ironmaking process still needs to be desulfurized by various desulfurization methods after being discharged from the blast furnace, so the desulfurization of blast furnace gas still has the problems of cumbersome procedures and high costs