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Preparation method of blast furnace injection coal

A blast furnace injection coal, blast furnace technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve the problems of reduced calorific value, increased operating costs, and inability to operate, and achieve the goal of suppressing adhesion, suppressing calorific value reduction, and low cost Effect

Inactive Publication Date: 2016-08-17
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, the pulverized coal (blast furnace pulverized coal) described in the above-mentioned Patent Document 1 only uses pulverized coal in which the softening point of the ash is adjusted to be 1300° C. high
In addition, because the slagging agent is only calcium oxide, depending on the ash composition of the single coal powder, the addition amount of the slagging agent becomes very large, which may lead to a decrease in the calorific value of blast furnace injection coal depending on the amount added
[0013] The above-mentioned Patent Document 2 only describes a blast furnace operation method to ensure the fluidity of the bosh slag generated in the blast furnace by making the viscosity at 1450° C. to be 10 poise or less. Inhibition of adhesion of blast furnace soot in the channel or blockage caused by blast furnace soot
In addition, since the above-mentioned flux is added, depending on the amount added, the calorific value of blast furnace injection coal may decrease

Method used

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  • Preparation method of blast furnace injection coal
  • Preparation method of blast furnace injection coal
  • Preparation method of blast furnace injection coal

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preparation example Construction

[0034] The blast furnace PCI coal produced by the method for preparing blast furnace PCI coal according to this embodiment is the combination of the first coal type satisfying the condition A and the second coal type satisfying the condition B in the The mixing ratio is mixed so that the Al, Si, Ca, and Mg oxides in the ash of the mixed coal of the first coal type and the second coal type are set to 100% by weight and the Al in the ash is 2 o 3 When the CaO content is 20% by weight, the CaO content in the ash is 40% by weight or more, so the ash melting point of the blast furnace injection coal is 100 to 150°C higher than the temperature of the hot air blown from the tuyeres of the main body of the blast furnace. As mentioned above, the ash of the blast furnace injection coal (blast furnace injection coal ash) will not be melted by the hot air, so it is possible to suppress the adhesion of the blast furnace injection coal ash in the passage of the blast furnace injection coal ...

Embodiment

[0038] Hereinafter, examples carried out to confirm the effects of the production method of blast furnace injection coal according to the present invention will be described, but the present invention is not limited to the following examples described based on various data.

[0039] First, if figure 1 As shown, the moisture content and the ash content of the coal when analyzing the raw coal of the coal, and the weight % of Al, Si, Ca, and Mg in the ash content of the coal are analyzed in advance (the first process S1), and the first one that satisfies the above-mentioned condition A is selected. coal type (second step S2), and select a second coal type that satisfies the condition B different from the condition A (third step S3). In this embodiment, the coal type 1 shown in the following table 1 is selected as the first coal type satisfying the condition A, and the coal type 2 shown in the following table 1 is selected as the first coal type satisfying the condition B. Descri...

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Abstract

Provided is a method for preparing blast furnace blow-in coal that can, at a low cost, obtain blast furnace blow-in coal that suppresses occlusion by blast furnace blow-in ash or accretion of blast furnace blow-in ash in a pathway leading to a tuyere of a blast furnace main body, while suppressing a decrease in the amount of heat release. The method includes selecting first and second coal types satisfying conditions (S2, S3), on the basis of the CaO content in the ash when the oxides of Al, Si, Ca, and Mg in the ash is 100 wt % and the Al2O3 content in the ash is 20 wt %, deriving the mixing ratio of the first and second coal types that results in the CaO content in the ash of the mixed coal being at least 40 wt % (S4), and mixing the first and second coal types (S5) at the mixing ratio.

Description

technical field [0001] The invention relates to a preparation method of blast furnace injection coal. Background technique [0002] Blast furnace equipment can load iron ore, limestone, coke and other raw materials into the interior from the top of the blast furnace body, and at the same time inject hot air from the side of the blast furnace body near the tuyeres below, and blast furnace injection coal (coal) powder) to make pig iron from iron ore. [0003] However, in order to operate the blast furnace facility stably, it is required to suppress the adhesion of blast furnace pulverized coal ash in the passage of the blast furnace pulverized coal to the tuyeres of the blast furnace main body or to prevent the blast furnace pulverized coal ash from adhering. of occlusion. [0004] For example, a method has been proposed in which the softening point of the ash in the pulverized coal is adjusted to 1300°C by adding a CaO-derived slagging agent such as limestone or serpentine ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00
CPCC10L5/366C10B53/04C10B57/04C10L9/08C10L2290/02C10L2290/24C10L2290/60C21B5/003C21B5/007
Inventor 中川庆一大本节男坂口雅一滨田务
Owner MITSUBISHI HEAVY IND LTD