JP2014132122A5

JP2014132122A5 -

Info

Publication number: JP2014132122A5
Application number: JP2014068059A
Authority: JP
Filing date: 2014-03-28
Publication date: 2014-10-09
Anticipated expiration: 2033-10-11

Description

（実施例１、参考例１）
図１に示すような高炉（内容積：１６００ｍ^３）に、酸化鉄原料及びコークスを装入するとともに、羽口から酸素富化空気及び微粉炭を吹き込んで、溶銑の製造を行った。そして、部分還元鉄（金属化率：８２％、炭素含有率：３．５％）を１００ｋｇ／ｔｏｎ装入し、図３に示す操作を行って、高炉の安定操業が可能な運転条件を求めた。その結果を図４にプロットした。実施例１及び参考例１では、図４にプロットされたいくつかの運転条件のうち、酸素富化率：１３．２％、微粉炭比：２３８ｋｇ／ｔｏｎの運転条件で、出銑比を２．８７ｔｏｎ／ｄ／ｍ^３にすることができた。 (Example 1 , Reference Example 1 )
A blast furnace (inner volume: 1600 m ³ ) as shown in FIG. 1 was charged with iron oxide raw material and coke, and oxygen-enriched air and pulverized coal were blown from the tuyere to produce hot metal. Then, partially reduced iron (metalization rate: 82%, carbon content: 3.5%) is charged at 100 kg / ton, and the operation shown in FIG. It was. The results are plotted in FIG. In Example 1 and Reference Example 1 , among several operating conditions plotted in FIG. 4, the output ratio was 2 under the operating conditions of oxygen enrichment rate: 13.2% and pulverized coal ratio: 238 kg / ton. .87 ton / d / m ³ .

（実施例２、参考例２）
部分還元鉄の装入量を２００ｋｇ／ｔｏｎとしたこと以外は、実施例１及び参考例１と同様にして、高炉の安定操業が可能な運転条件を求めた。その結果を図４にプロットした。実施例２及び参考例２では、図４にプロットされたいくつかの運転条件のうち、酸素富化率：１６％、微粉炭比：２３７ｋｇ／ｔｏｎの運転条件で、出銑比を２．９４ｔｏｎ／ｄ／ｍ^３にすることができた。 (Example 2 and Reference Example 2 )
The operating conditions under which stable operation of the blast furnace was possible were determined in the same manner as in Example 1 and Reference Example 1 except that the amount of partially reduced iron charged was 200 kg / ton. The results are plotted in FIG. In Example 2 and Reference Example 2 , among several operating conditions plotted in FIG. 4, the oxygen enrichment ratio: 16%, the pulverized coal ratio: 237 kg / ton, and the output ratio is 2.94 ton. / D / m ³ .

（実施例３、参考例３）
部分還元鉄の装入量を３００ｋｇ／ｔｏｎとしたこと以外は、実施例１及び参考例１と同様にして、高炉の安定操業が可能な運転条件を求めた。その結果を図４にプロットした。実施例３及び参考例３では、図４にプロットされたいくつかの運転条件のうち、酸素富化率：１６％、微粉炭比：２２５ｋｇ／ｔｏｎの運転条件で、出銑比を３．０９ｔｏｎ／ｄ／ｍ^３にすることができた。 (Example 3 , Reference Example 3 )
The operating conditions under which stable operation of the blast furnace was possible were determined in the same manner as in Example 1 and Reference Example 1 except that the amount of partially reduced iron charged was 300 kg / ton. The results are plotted in FIG. In Example 3 and Reference Example 3 , among several operating conditions plotted in FIG. 4, the oxygen enrichment ratio: 16%, the pulverized coal ratio: 225 kg / ton, and the output ratio is 3.09 ton. / D / m ³ .

（実施例４、参考例４）
部分還元鉄の装入量を４００ｋｇ／ｔｏｎとしたこと以外は、実施例１及び参考例１と同様にして、高炉の安定操業が可能な運転条件を求めた。その結果を図４にプロットした。実施例４及び参考例４では、図４にプロットされたいくつかの運転条件のうち、酸素富化率：１４％、微粉炭比：２１０ｋｇ／ｔｏｎの運転条件で、出銑比を３．２５ｔｏｎ／ｄ／ｍ^３にすることができた。 (Example 4 , Reference Example 4 )
The operating conditions under which stable operation of the blast furnace was possible were determined in the same manner as in Example 1 and Reference Example 1 except that the amount of partially reduced iron charged was 400 kg / ton. The results are plotted in FIG. In Example 4 and Reference Example 4 , among several operating conditions plotted in FIG. 4, the oxygen enrichment ratio: 14%, the pulverized coal ratio: 210 kg / ton, and the output ratio is 3.25 ton. / D / m ³ .

（実施例５、参考例５）
部分還元鉄の装入量を５００ｋｇ／ｔｏｎとしたこと以外は、実施例１及び参考例１と同様にして、高炉の安定操業が可能な運転条件を求めた。その結果を図４にプロットした。実施例５及び参考例５では、図４にプロットされたいくつかの運転条件のうち、酸素富化率：１４％、微粉炭比：１９８ｋｇ／ｔｏｎの運転条件で、出銑比を３．４４ｔｏｎ／ｄ／ｍ^３にすることができた。 (Example 5 , Reference Example 5 )
The operating conditions under which stable operation of the blast furnace was possible were determined in the same manner as in Example 1 and Reference Example 1 except that the amount of partially reduced iron charged was 500 kg / ton. The results are plotted in FIG. In Example 5 and Reference Example 5 , among several operating conditions plotted in FIG. 4, the oxygen enrichment ratio: 14%, the pulverized coal ratio: 198 kg / ton, and the output ratio is 3.44 ton. / D / m ³ .

（実施例６、参考例６）
部分還元鉄の装入量を６００ｋｇ／ｔｏｎとしたこと以外は、実施例１及び参考例１と同様にして、高炉の安定操業が可能な運転条件を求めた。その結果を図４にプロットした。実施例６及び参考例６では、図４にプロットされたいくつかの運転条件のうち、酸素富化率：１４％、微粉炭比：１９０ｋｇ／ｔｏｎの運転条件で、出銑比を３．６３ｔｏｎ／ｄ／ｍ^３にすることができた。 (Example 6 , Reference Example 6 )
The operating conditions under which stable operation of the blast furnace was possible were determined in the same manner as in Example 1 and Reference Example 1 except that the amount of partially reduced iron charged was 600 kg / ton. The results are plotted in FIG. In Example 6 and Reference Example 6 , among several operating conditions plotted in FIG. 4, the oxygen enrichment ratio: 14%, the pulverized coal ratio: 190 kg / ton, and the output ratio is 3.63 ton. / D / m ³ .

Claims

A blast furnace in which iron oxide raw material, coke and partially reduced iron are charged from the top of the blast furnace, and pulverized coal and oxygen-enriched air are blown from the tuyere of the blast furnace to reduce the iron oxide raw material to obtain molten iron Operating method,
When the oxygen enrichment rate of the oxygen-enriched air is x (%) and the amount of the pulverized coal per 1 ton of hot metal is y (kg / ton), x and y are expressed by the following formula (1) Blast furnace operation method satisfying (3) .
25x-175 <y <31x + 31 ( 1 )
y> 130 ( 2 )
x> 8 (3)

The operating method of the blast furnace of Claim 1 with which the blowing amount of the said pulverized coal exceeds 130 kg per 1 ton of hot metal.

The operating method of the blast furnace of Claim 1 or 2 whose charging amount of the said partially reduced iron is 100-600 kg per 1 ton of hot metal.

The operating method of the blast furnace as described in any one of Claims 1-3 which adjusts the said oxygen enrichment in the range exceeding 8% and 16% or less.

The operating method of the blast furnace as described in any one of Claims 1-4 whose carbon content rate of the said partially reduced iron is 2.3-5.9 mass%.

The operating method of the blast furnace as described in any one of Claims 1-5 whose ratio of the partially reduced iron with a particle size of less than 5 mm with respect to the whole of the said partially reduced iron with which the said blast furnace is charged is 10 mass% or less.

The operation method of the blast furnace as described in any one of Claims 1-6 whose crushing strength of the said partially reduced iron charged in the said blast furnace is 30 kg / cm < ² > or more.

The manufacturing method of the hot metal which manufactures the said hot metal with the operating method of the blast furnace as described in any one of Claims 1-7 .