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Method of separating blast furnace gas

A blast furnace gas and separation method technology, applied in the separation method, blast furnace, hydrogen separation, etc., can solve the problems of high cost, large amount of blast furnace gas, and difficulty in removing carbon dioxide and nitrogen

Active Publication Date: 2011-02-16
JFE STEEL CORP
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  • Abstract
  • Description
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Problems solved by technology

[0011] Japanese Unexamined Patent Publication No. 62-193622 discloses that carbon monoxide and hydrogen-rich fuel gas are produced by removing carbon dioxide and nitrogen from blast furnace gas, but in the embodiment of Japanese Patent Laid-Open No. 62-193622, the carbon monoxide and hydrogen-rich fuel gas The calorific value is less than 1000kcal / Nm 3 , it is difficult to say that carbon dioxide and nitrogen are fully removed
In addition, before the separation and removal of carbon dioxide and nitrogen, the nitrogen content of blast furnace gas is as high as 55%, and there is a problem that the amount of blast furnace gas to be processed is large, and the cost of separating and removing carbon dioxide and nitrogen is high.

Method used

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  • Method of separating blast furnace gas
  • Method of separating blast furnace gas

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Experimental program
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Effect test

Embodiment approach 1

[0054] The method for separating blast furnace gas according to Embodiment 1 is characterized in that oxygen-enriched air having an oxygen concentration of 25% by volume or more is blown into the blast furnace through a tuyere provided at the lower part of the blast furnace to carry out blast furnace operation, and the blast furnace operation recovers gas from the top of the blast furnace. The exhausted blast furnace gas is separated from the recovered blast furnace gas to remove carbon dioxide and nitrogen in the gas. Hereinafter, Embodiment 1 will be specifically described.

[0055] The gas composition and calorific value when separating and removing carbon dioxide and nitrogen from blast furnace gas are explained. Shown in Table 1, for example, from containing hydrogen (hereinafter, also referred to as "H 2 ") 4.4% by volume, nitrogen (hereinafter, also referred to as "N 2 ") 49.9% by volume, carbon monoxide (hereinafter also referred to as "CO") 23.6% by volume, carbon d...

Embodiment approach 2

[0094] The blast furnace gas separation method according to Embodiment 2 is characterized in that CO contained in the gas is separated and removed from the blast furnace gas discharged from the top of the blast furnace. 2 and N 2 , producing a modified blast furnace gas having a higher calorific value than the blast furnace gas, and blowing the modified blast furnace gas into a blast furnace for recycling.

[0095] According to Embodiment 2, due to the removal of CO from the blast furnace gas 2 and N 2 , so the calorific value of 1060kcal / Nm can be obtained, which is more than twice that of the existing blast furnace gas 3 above (preferably 1500kcal / Nm 3 above, more preferably 2000kcal / Nm 3 above) modified blast furnace gas. When the reformed blast furnace gas is blown into the blast furnace, the reformed blast furnace gas functions as a reducing agent, thereby reducing the supply amount of the reducing agent, that is, coke or finely powdered carbon. In addition, when us...

Embodiment approach 3

[0116] The gas mixed with blast furnace gas and coke oven gas and / or converter gas is called mixed gas or M gas. Of the by-product gases produced in ironworks, blast furnace gas is extremely large compared to other by-product gases, and the reason why the blast furnace gas is gasified as a mixed gas is to effectively utilize the blast furnace gas.

[0117] Examples of gas turbine cogeneration facilities that utilize this mixed gas as fuel gas include Figure 5 shown. exist Figure 5 Among them, 101 is a gas turbine, 102 is a steam turbine, 103 is a generator, 104 is a fuel gas compressor, 105 is an air compressor, 106 is a burner, 107 is an exhaust boiler, and 108 is a transmission composed of two gears . Such as Figure 5 As shown, the combined gas turbine power generation facility is configured by arranging a gas turbine 101, a steam turbine 102, and a generator 103 on the same shaft. Gas turbine combined power generation facilities are widely used in intensive steel pl...

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Abstract

A method of separating a blast furnace gas which comprises: a step in which oxygen-enriched air having an oxygen concentration of at least 25 vol.% is yielded; a step in which the oxygen-enriched air is blown into a blast furnace through a tuyere disposed in a lower part of the blast furnace; and a step in which carbon dioxide and nitrogen are separated and removed from a blast furnace gas discharged from the top of the blast furnace, thereby generating a modified blast furnace gas.

Description

technical field [0001] The present invention relates to a method for separating and removing carbon dioxide and nitrogen contained in blast furnace gas discharged from the top of a blast furnace to use as fuel gas reducing gas or reducing gas. Background technique [0002] In an intensive iron and steel plant, blast furnace gas discharged from the top of a blast furnace that reduces iron ore to produce molten pig iron can be effectively used as fuel gas for hot blast stoves, fuel gas for coke ovens, and fuel gas for power generation. [0003] However, the composition of blast furnace gas is carbon monoxide: 21.1 to 26.2% by volume, carbon dioxide: 19.3 to 23.2% by volume, hydrogen: 2.9 to 5.3% by volume, and nitrogen: 52.5 to 59.2% by volume. There are few combustible gas components, and its calorific value is low. 3031~3784kJ (723~903kcal / Nm 3 ) (refer to the 4th edition of Iron and Steel Handbook (CD-ROM) No.1, Volume 2 Iron and Steel, issued on July 30, 2002, Table 42-5....

Claims

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Application Information

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IPC IPC(8): B01D53/06B01D53/14B01D53/62C21B5/00B01D53/04
CPCC01B2203/0475F23L2900/07005C01B2203/84C01B2203/043B01D2256/24C01B2203/06C01B3/52B01D2257/80B01D2253/106F23R2900/00002C01B3/56Y02C10/08B01D2256/20Y02C10/04B01D2253/108C21B2100/02B01D53/047C01B2203/0405B01D2257/102C21B2100/06B01D2256/12C21B5/06C01B3/501B01D53/06C01B2203/0465B01D2256/16B01D2257/504C10K1/005Y02C10/06C01B2203/0415B01D53/0407B01D2258/025Y02P10/122C21B2100/284C21B2100/282Y02C20/40Y02E20/34Y02P10/25Y02P10/32Y02P20/151
Inventor 中川二彦原冈卓司岸本启那须卓井田博之
Owner JFE STEEL CORP
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