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Sintering gas flue gas sulfuric dioxide decrement discharge technology

A technology of sulfur dioxide and sintering flue gas, which is applied in the field of iron and steel metallurgy, can solve the problems of unsuitable industrial application, high operating cost, and low concentration, achieve broad promotion value and application prospects, reduce investment cost and operating cost, and reduce the total amount The effect of emissions

Inactive Publication Date: 2009-03-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flue gas desulfurization technology (FGD) is used to purify the sintering flue gas at the head of the sintering machine. Although it is not technically a problem, the investment is large and the operating cost is high. Under the current domestic technical and economic conditions, domestic sintering flue gas desulfurization is blank, and all adopt Due to high chimney emissions, a small number of iron and steel plants have carried out relevant flue gas desulfurization industrial tests on small sintering machines, but they have not solved the problem of large amount of flue gas and SO in flue gas. 2 The problem of low concentration makes it impossible for industrial application

Method used

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  • Sintering gas flue gas sulfuric dioxide decrement discharge technology
  • Sintering gas flue gas sulfuric dioxide decrement discharge technology
  • Sintering gas flue gas sulfuric dioxide decrement discharge technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Sintering machine area 180m 2 , 15 sintered bellows, according to the traditional process, the limestone (lime)-gypsum method is used to desulfurize the flue gas of all the sintered bellows, and the sintered flue gas volume is 600kNm 3 / h, SO in flue gas 2 Average concentration 500mg / Nm 3 , sintering flue gas desulfurization efficiency 75%, flue gas denitrification efficiency 70%, SO in flue gas after desulfurization 2 Concentration 40mg / Nm 3 . This embodiment is divided into high SO 2 area, high SO 2 area outside the area. where high SO 2 The region outside the region is divided into the initial part of the ignition region, the ignition smoke region and the high SO 2 The area between the areas and the area at the end of the sintering machine.

[0040] According to the technical process of the present invention, the limestone (lime)-gypsum method is also adopted, and only the high-concentration SO2 is selectively processed without flue gas circulation. 2 Flue ...

Embodiment 2

[0043] Sintering machine area 180m 2 , 15 sintered bellows, according to the traditional process, the limestone (lime)-gypsum method is used to desulfurize the flue gas of all the sintered bellows, and the sintered flue gas volume is 600kNm 3 / h, SO in flue gas 2 Average concentration 600mg / Nm 3 , the desulfurization efficiency of sintering flue gas is 80%, and the SO in the flue gas after desulfurization 2 Concentration 38mg / Nm 3 . This embodiment is divided into high SO 2 area, high SO 2 area outside the area. where high SO 2 The region outside the region is divided into the initial part of the ignition region, the ignition smoke region and the high SO 2 Zones between zones, high SO 2 The area between the area and the tail of the sintering machine and the area of ​​the tail of the sintering machine.

[0044] Press technological process of the present invention, adopt limestone (lime)-gypsum method equally, carry out high SO 2 Flue gas circulation in the zone betwe...

Embodiment 3

[0047] Sintering machine area 180m 2 , 15 sintered bellows, according to the traditional process, the limestone (lime)-gypsum method is used to desulfurize the flue gas of all the sintered bellows, and the sintered flue gas volume is 600kNm 3 / h, SO in flue gas 2 Average concentration 700mg / Nm 3 , the desulfurization efficiency of sintering flue gas is 82%, and the SO in the flue gas after desulfurization 2 Concentration 45mg / Nm 3 ; The present embodiment is divided into high SO 2 area, high SO 2 area outside the area. where high SO 2 The region outside the region is divided into the initial part of the ignition region, the ignition smoke region and the high SO 2 Zones between zones, high SO 2 The area between the area and the tail of the sintering machine and the area of ​​the tail of the sintering machine.

[0048] According to the technical process of the present invention, limestone (lime)-gypsum method is also adopted to carry out ignition flue gas circulation an...

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Abstract

The invention relates to an emission reduction process by sintering flue gas sulfur dioxide; the flue gas is collected by sections depending on difference sintering zones; the sintering zones include a high SO2 zone and other zones; in the high SO2 zone, the emission of SO2 during sintering accounts for 60 percent to 80 percent of the emission of the SO2 in the whole sintering process, and the flue gas during sintering accounts for 50 percent to 70 percent of the flue gas in the whole sintering process; the flue gas produced in the high SO2 zone is collected, dedusted, desulfurized, denitrated and emitted from a chimney; in a sintering machine, after being collected, the flue gas in other zones is dedusted and emitted from the chimney, or circulated to the sintering machine to be sintered in hot air. The process can reduce the flue gas treatment in flue gas desulfurization, reduces the treated flue gas by 25 percent to 50 percent, so that the concentration of the SO2 in the treated flue gas is two to four times improved; compared with conventional processes, the process can keep the sintering mineral quality basically unchanged, but can improve the desulfurization rate of the flue gas desulfurizing device, and reduce the equipment investment and operation cost of the sintered flue gas desulfurizing device.

Description

technical field [0001] The invention relates to a new process for reducing emission of sulfur dioxide in sintering flue gas, and belongs to the field of iron and steel metallurgy. Background technique [0002] Iron ore sinter is the main charge of blast furnace ironmaking in my country, accounting for more than 70% of the iron charge in the furnace. In 2005, the annual output of sinter in China reached about 550 million tons. The sintering production process is not only a link with huge material flow in the iron and steel industry, but also a main link with high energy consumption and high pollution emission coefficient. SO in the atmosphere of the iron and steel production system 2 About 40% to 60% come from the sintering plant. Therefore, reducing the emission of SO produced in the sintering process 2 It plays an important role in the environmental protection of the steel industry. However, due to the large flue gas flow rate of the sintering head, it is generally 1500-...

Claims

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Application Information

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IPC IPC(8): C22B1/16B01D53/50F27B21/08F27D17/00
Inventor 朱德庆潘建邱冠周
Owner CENT SOUTH UNIV
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