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Optimization method for blast furnace blowing of high-calcium bituminous coal based on ash melting characteristics

An optimization method, calcium bituminous coal technology, applied in blast furnaces, flow characteristics, blast furnace details, etc., can solve problems such as tuyere slagging, low ash melting point, and unclear optimization methods, and achieve the effect of expanding resources

Inactive Publication Date: 2019-09-06
INNER MONGOLIA UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

However, due to the poor coal ash melting characteristics and low ash melting point of Shendong high-calcium bituminous coal, it is easy to cause slagging at the tuyere when it is used for blast furnace injection. At present, the evaluation of Shendong high-calcium bituminous coal during the injection process by iron and steel enterprises is still unclear. The optimization method of high-calcium bituminous coal for blast furnace injection based on ash melting characteristics is not clear, which greatly limits the promotion of high-calcium bituminous coal for blast furnace injection

Method used

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  • Optimization method for blast furnace blowing of high-calcium bituminous coal based on ash melting characteristics
  • Optimization method for blast furnace blowing of high-calcium bituminous coal based on ash melting characteristics
  • Optimization method for blast furnace blowing of high-calcium bituminous coal based on ash melting characteristics

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Effect test

Embodiment 1

[0045] A high-calcium bituminous coal A and a commonly used blast furnace injection anthracite B were selected, and the basic characteristics and injection process characteristics of the two coal powders were experimentally measured according to the above method. The measurement results are as follows:

[0046] Table 1 Industry-wide analysis of pulverized coal

[0047]

[0048] Table 2 Elemental analysis of pulverized coal

[0049] sample name C H N S O A 74.59 3.95 0.76 0.21 12.64 B 81.20 3.11 1.24 0.67 2.09

[0050] Table 3 Ash composition analysis of pulverized coal

[0051] sample name SiO 2

Al 2 o 3

Fe 2 o 3

CaO MgO TiO 2

SO 3

P 2 o 5

K 2 o

Na 2 o

A 21.17 10.64 22.92 31.70 0.89 0.39 8.72 0.04 1.07 1.35 B 53.05 35.69 2.55 2.36 0.32 1.87 0.70 1.12 0.71 1.05

[0052] Table 4 Determination results of pulverized coal Hastelloy grindability...

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Abstract

The invention relates to an optimization method for blast furnace blowing of high-calcium bituminous coal based on ash melting characteristics. The method comprises the following steps of S101, firstly determining the basic characteristics of the high-calcium bituminous coal; S102, determining the blowing process characteristics of the high-calcium bituminous coal, and determining feasibility of the high-calcium bituminous coal; and S103, mixing is carried out according to the ratio of anthracite to bituminous coal being 5:5, 6:4, 7:3 and 8:2, determining the ash melting characteristics of themixed coal, and selecting a coal mixing scheme which conforms to the actual production requirements in the suitable volatile conditions with high cost performance and the ash softening temperature being greater than 1250 DEG C. According to the optimization method for blast furnace blowing of the high-calcium bituminous coal based on the ash melting characteristics, a new idea can be provided forcoal blending optimization of the blast furnace coal spraying process, resource for blast furnace blowing coal of iron and steel enterprises are expanded, and meanwhile, the method has positive significance on the high-value utilization of the low-rank coal, the quality improving and efficiency increasing of the coal enterprises are promoted, and win-win is brought to iron and steel enterprises and coal enterprises.

Description

technical field [0001] The invention relates to an optimization method for blast furnace injection of high-calcium bituminous coal based on ash melting characteristics. Background technique [0002] Blast furnace mass injection of pulverized coal technology is one of the strategic technologies for the development of my country's iron and steel industry. At present, the price of coal resources is rising, and the price difference between coal and coke still exists. It is an important way to develop ironmaking production by injecting a large amount of cheap coal powder instead of relatively expensive coke to reduce costs and increase production. Very good value for money. [0003] my country's coal resources are abundant, but high-quality coal resources are becoming increasingly scarce. Domestic iron and steel enterprises have realized the importance of comprehensive development and utilization of coal resources for blast furnace injection. Compared with anthracite, bituminou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00G01N33/22G01N23/223G01N25/54G01N25/04G01N11/00
CPCC21B5/003C21B5/008G01N11/00G01N23/223G01N25/04G01N25/54G01N33/222
Inventor 柴轶凡罗果萍安胜利赵永旺宋希文彭军王艺慈
Owner INNER MONGOLIA UNIV OF SCI & TECH
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