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Method for using biomass in blast furnace

A biomass and biomass coke technology, applied in blast furnaces, biofuels, blast furnace details, etc., can solve problems such as high moisture content and low calorific value, and achieve the effect of increasing calorific value and reducing CO2 emissions

Inactive Publication Date: 2012-09-12
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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 use is not for the benefit of

Method used

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  • Method for using biomass in blast furnace
  • Method for using biomass in blast furnace
  • Method for using biomass in blast furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] use figure 1 The shown equipment was used to carry out the dry distillation experiment of biomass. Among them, the heating method of the rotary kiln is a three-stage (3 division) electric heating. The inner diameter of the rotary furnace is 15 cm, the length is 1.0 m, and the inclination angle is 1 degree, and the carbonization time is adjusted by changing the rotational speed of the rotary furnace. As the biomass, cedar waste wood crushed and classified into 3 to 10 mm, coconut trunks, and coconut shells were used. The composition of the biomass used is listed in Table 1.

[0046] [Table 1]

[0047]

[0048] The feed rate of the biomass to the rotary kiln was 1.0 kg / h, and the carbonization temperature and carbonization time were changed to produce No. 1 to No. 12 biomass cokes. The HGI and calorific value of the obtained biomass char were measured. The test conditions and results are listed in Table 2.

[0049]

[0050] According to Table 2, by performing ...

Embodiment 2

[0052] Coal with an HGI of 86 was mixed with the biomass cokes Nos. 1 to 7 and 11 obtained in Example 1 at a mass ratio of biomass coke:coal=10:90, and the HGI was measured. The HGI of the mixture is in the range of 78 to 83, and it can be seen that there is no problem in pulverizing with a coal mill in a mixed state.

[0053] This mixture was pulverized by a roller mill until the particle size distribution was 74 μm or less and 80% by mass or more, and a pulverized coal injection device was used to perform a test of blowing it in from a blast furnace tuyere. There is no clogging in the blowing piping, and the same operation as normal pulverized coal blowing can be performed.

[0054] Symbol Description

[0055] 1 biomass feed hopper

[0056] 2 Conveyor (biomass conveying means)

[0057] 3 rotary kilns

[0058] 4 Biomass coke transportation means

[0059] 5 Dry distillation gas, tar delivery means

[0060] 6Heating gas generator

[0061] 7 Biomass char feeding hopper

...

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Abstract

Provided is a biomass using method capable of, when biomass is used as a blast furnace blowing material as a substitute for pulverized coal, increasing the flammability and heating value of the biomass to about the same level as those of the pulverized coal and capable of using conventional pulverized coal blowing equipment by enhancing the air transportability. A method for using biomass in a blast furnace is used, the method being characterized in that: biomass (A) is dried by distillation to manufacture biomass coal (D) showing a Hardgrove grindability index (HGI) of 45 or more; the biomass coal (D) is pulverized together with coal (B); and the pulverized powder is blown from a tuyere (15) as an auxiliary reducing material in a blast furnace (14). It is preferable that the biomass (A) is dried by distillation at 450 DEG C or higher for 30 minutes or longer to manufacture the biomass coal.

Description

technical field [0001] The present invention relates to a method for utilizing biomass in a blast furnace, wherein when biomass coke produced by dry distillation of biomass is used in a blast furnace, it is used as an auxiliary reducing material for the blast furnace in the form of pulverized coal. 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. The amount of pulverized coal to be blown in varies depending on the operating conditions, and the more the amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00B09B3/00C10B53/02C10L5/44
CPCC10B47/30C10B53/02C10L5/44C10L9/08C21B5/001C21B5/023C21B2200/00C21B2300/02Y02E50/10Y02E50/30Y02P10/20B09B3/00C21B5/00
Inventor 鹤田秀和浅沼稔藤林晃夫
Owner JFE STEEL CORP
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