System and method for utilizing top gas of sponge iron produced by reducing shaft furnace

A technology of top gas and sponge iron, which is applied in shaft furnaces, furnaces, furnace types, etc., can solve the problems of complex top gas treatment process and low heat energy recovery rate of top gas, and achieve low-carbon and environmental protection production, Effect of Reducing Energy Consumption of Shaft Furnace

Pending Publication Date: 2017-06-13
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
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Problems solved by technology

[0005] Therefore, in view of the low recovery rate of heat energy of the top gas when producing sponge iron in the prior art shaft furnace, only part of the heat energy can be recovered and the by-product medium-pressure steam, and the top gas treatment process is complicated, and the treatment process is only applicable to the smelting gas furnace - The shaft furnace process is not applicable to the problem of using natural gas and coke oven gas as raw material gas reforming to produce reducing gas to produce sponge iron. It is necessary to propose a new furnace top gas utilization technology

Method used

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  • System and method for utilizing top gas of sponge iron produced by reducing shaft furnace

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Embodiment 1

[0052] In this embodiment, coke oven gas is used as the raw material gas to reduce the iron ore in the shaft furnace, and the composition of the coke oven gas after refining and desulfurization is: 60% H 2 , 8% CO, 27% CH 4 , 4%C 2+ , 2%CO 2 , 2%N 2 , 0.5% O 2 . 350-400 ℃ shaft furnace top gas composition: 32.6%H 2 , 12.2% CO, 12.6% CH 4 , 9.7%CO 2 , 9.3%N 2 , 23.6%H 2 O, after being discharged through the exhaust pipe, it directly enters the iron concentrate pellet preheating tank to preheat the iron concentrate pellet. Such as figure 1 As shown, the outlet temperature of the gas is 150°C after passing through the charge preheating tank 2, and then enters the cooling and dust removal system such as the washing tower 4 to cool down to about 40°C, and the dust content drops to 500mg / m 3 . The dedusted gas is dehydrated by the dehydrator 5, and then pressurized by the compressor 7 and then enters the decarbonization system 6 such as MDEA solution for decarburization ...

Embodiment 2

[0057] In this embodiment, coke oven gas is used as the raw material gas to reduce the iron ore in the shaft furnace, and the composition of the coke oven gas after refining and desulfurization is: 60% H 2 , 8% CO, 27% CH 4 , 4%C 2+ , 2%CO 2 , 2%N 2 , 0.5% O 2 . 350-400 ℃ shaft furnace top gas composition: 32.6%H 2 , 12.2% CO, 12.6% CH 4 , 9.7%CO 2 , 9.3%N 2 , 23.6%H 2 O, after being discharged through the exhaust pipe, it directly enters the iron concentrate pellet preheating tank to preheat the iron concentrate pellet. Such as figure 1 As shown, the outlet temperature of the gas is 150°C after passing through the charge preheating tank 2, and then enters the cooling and dust removal system such as the washing tower 4 to cool down to about 40°C, and the dust content drops to 500mg / m3. The dedusted gas is dehydrated by the dehydrator 5, and then pressurized by the compressor 7 and then enters the decarbonization system 6 such as MDEA solution for decarburization tre...

Embodiment 3

[0062] In this embodiment, coke oven gas is used as the raw material gas to reduce the iron ore in the shaft furnace, and the composition of the coke oven gas after refining and desulfurization is: 60% H 2 , 8% CO, 27% CH 4 , 4%C 2+ , 2%CO 2 , 2%N 2 , 0.5% O 2 . 350-400 ℃ shaft furnace top gas composition: 32.6%H 2 , 12.2% CO, 12.6% CH 4 , 9.7%CO 2 , 9.3% N 2 , 23.6%H 2 O, after being discharged through the exhaust pipe, it directly enters the iron concentrate pellet preheating tank to preheat the iron concentrate pellet. Such as figure 1As shown, the outlet temperature of the gas is 150°C after passing through the charge preheating tank 2, and then enters the cooling and dust removal system such as the washing tower 4 to cool down to about 40°C, and the dust content drops to 500mg / m3. The dedusted gas is dehydrated by the dehydrator 5, and then pressurized by the compressor 7 and enters the decarbonization system 6 such as MDEA solution for decarburization treatmen...

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Abstract

The invention relates to a system and method for utilizing top gas of sponge iron produced by a reducing shaft furnace. The system comprises a preheating tank, a washing tower, a dehydrator, a decarburization system, a cooling gas input pipe, a cooling gas exhaust pipe and a pre-reducing tank. The preheating tank, the washing tower, the dehydrator and the decarburization system are sequentially connected to the outside of the reducing shaft furnace, and a preheated gas inlet of the preheating tank is connected with a top gas outlet; the cooling gas input pipe and the cooling gas exhaust pipe are arranged on a lower cooling section of the reducing shaft furnace and communicated with the interior of the cooling section, an inlet of the cooling gas input pipe is connected with a cooling gas outlet of the decarburization system, the pre-reducing tank is arranged outside the reducing shaft furnace, and a reduced gas inlet of the pre-reducing tank is connected with an outlet of the cooling gas exhaust pipe. Heat energy included in the high-temperature top gas can be fully utilized for preheating ore, the heat energy of the cooled top gas and CO and H2 reducing gas in coal gas can be utilized for pre-reducing the preheated ore, the energy consumption of the shaft furnace is reduced, and low carbon and environmental friendliness of the shaft furnace ironmaking technology are achieved.

Description

technical field [0001] The invention belongs to the field of reduction shaft furnaces, and in particular relates to a top gas utilization system and method for producing sponge iron in a reduction shaft furnace. Background technique [0002] my country is a big country in steel production. In 2015, the crude steel output in mainland China was 804 million tons, accounting for 49.5% of the global total. However, the structure of the iron and steel industry is unreasonable, with a high iron-steel ratio and a small proportion of electric furnace steel, and some special steel varieties still need to be imported. High, poor economic benefits. Gas-based shaft furnace direct reduction technology has been maturely applied abroad as the main non-blast furnace ironmaking technology. , Energy-saving and emission-reducing effects are obvious advantages, and it is an important production technology to improve the structure of iron and steel products, improve the quality of iron and stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02
CPCY02P10/143C21B13/02C21B13/0073
Inventor 吴道洪员晓范志辉刘亮曹志成
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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