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Method for operating blast furnace

A technology of blast furnace operation and biomass coking, which is applied to blast furnaces, blast furnace details, furnaces, etc., can solve problems such as low calorific value and high moisture content, and achieve the effect of reducing CO2 emissions

Active Publication Date: 2015-06-17
JFE STEEL CORP
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Problems solved by technology

[0005] Biomass is composed of carbon, oxygen, and hydrogen, but itself has a high moisture content and low calorific value (for example, moisture 15% by mass, calorific value 16.2MJ / kg-dry basis), from the perspective of efficiency, in the direct ironmaking process The use of

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  • Method for operating blast furnace

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Embodiment 1

[0064] use figure 2 The shown rotary kiln apparatus performs dry distillation of biomass to perform a production test of biomass coke. The heating method of the rotary kiln is three-stage (3 division) electric heating. The inner diameter of the rotary furnace is 15 cm, the length is 1.0 m, the inclination angle is 1 degree, the carbonization temperature is 375° C., and the carbonization time is 50 minutes (rotary furnace speed: 1.5 rpm). As the biomass, cedar waste wood crushed and classified into 3 mm to 10 mm was used. The composition of the biomass used is listed in Table 2.

[0065] [Table 2]

[0066]

[0067] The feed rate of biomass into the rotary kiln was 2.0 kg / h. The yield of the obtained biomass char was 33.9 mass %, the volatile matter concentration was 40.1 mass %, and the calorific value was 7770 kcal / kg.

[0068] The biomass coke obtained above was pulverized, mixed with pulverized coal having the composition shown in Table 3, and evaluated for combusti...

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Abstract

A method for operating a blast furnace is provided with which problems that arise when dust coal is used as a supplemental reducing material in a blast furnace operation are eliminated and it is possible to contribute to a reduction in CO2 emission by using biomass in place of dust coal. The method for operating a blast furnace into which dust coal is blown as a supplemental reducing material through the tuyeres is characterized by carbonizing biomass (1) in a carbonizer (2), pulverizing the resultant biomass char (3), and blowing the pulverized char into the furnace through the tuyeres simultaneously with dust coal (4). It is preferable that the dust coal and the biomass char be mixed with each other by means of a mixer (5) and then blown into the furnace through the tuyeres, and that the dust coal and the biomass char be blown through the tuyeres so that the total volatile concentration therein is 10 mass% or more.

Description

technical field [0001] The present invention relates to a blast furnace operation method in which, in a blast furnace process using pulverized coal (fine powdered charcoal) as an auxiliary reducing material, biomass coke (biomass char) obtained by dry distillation of biomass is used as a blast furnace Auxiliary reduction materials are utilized. Background technique [0002] In a blast furnace typified by a vertical furnace, an iron source such as iron ore or scrap iron, and coke as an iron ore reducing material and a heat source are used as raw materials. In order to manufacture coke suitable for blast furnace operation, expensive and high-quality raw material coal (coal for coke making) is required. Therefore, currently, a blast furnace operation method is performed in which finely pulverized fuel coal is blown from the tuyeres of the blast furnace as a heat source to reduce the amount of expensive coke used. Unlike coal for coke making, the pulverized coal used for blowi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00B09B3/00C10B53/02C10L5/44
CPCC10B47/30C10B53/02C21B5/001C21B5/023Y02E50/10Y02E50/30B09B3/00C10L5/44C21B5/00
Inventor 鹤田秀和浅沼稔藤林晃夫
Owner JFE STEEL CORP
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