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

A blast furnace gas, high-efficiency technology, applied in the field of blast furnace gas desulfurization, can solve the problems of high cost and cumbersome process, and achieve the effect of reducing desulfurization cost, good desulfurization effect and low cost

Pending Publication Date: 2021-07-09
刘森
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 b

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1, the fine desulfurization method described in the present invention is specifically: adding desulfurizer to the pulverized coal according to a certain proportion during the process of transporting the pulverized coal to the blast furnace, and atomizing the pulverized coal and the desulfurizer through the coal injection equipment The state is sprayed into the blast furnace at the same time. After entering the blast furnace, the pulverized coal starts to burn in the air in the blast furnace cavity with the help of high temperature and oxygen, and the desulfurizer chemically reacts with the sulfur in the gas in the blast furnace cavity in the air in the blast furnace cavity.

[0022] The desulfurizer is preferably magnesium powder, specifically crystal magnesia or dead-burned magnesia. Calcium oxide and calcium oxide are both relatively small. After the magnesium powder is injected into the blast furnace, it stays in the air for a longer time, which fully gives th...

Embodiment 2

[0024] Example 2 is different from Example 1 in that the desulfurizing agent is sprayed into the blast furnace separately in an atomized state through powder spraying equipment according to a certain ratio. The desulfurizing agent is preferably magnesium powder, specifically crystalline magnesia or dead-burned magnesia Coal powder and magnesium powder are injected into the blast furnace respectively without prior mixing. The magnesium powder reacts directly with the sulfur in the blast furnace gas to form magnesium sulfite, and the magnesium sulfite reacts with oxygen to generate sulfuric acid. Magnesium and magnesium sulfate are discharged out of the blast furnace along with the slag after they are produced. This method also achieves the purpose of desulfurizing the blast furnace gas in the blast furnace, and can also achieve the desulfurization effect in Example 1.

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C10K1/30C10K1/00C10L9/10C10L10/02
CPCC10K1/004C10K1/30C10L9/10C10L10/02
Inventor 刘森
Owner 刘森
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