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Method for improving blast furnace bituminous coal injection proportion

A furnace bituminous coal, proportional technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve problems such as increasing the use of low-quality coal and shortage of high-quality coal resources

Inactive Publication Date: 2021-07-23
TANGSHAN DELONG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a method for increasing the proportion of blast furnace bituminous coal injection. The method provided by the present invention increases the use of low-quality coal on the premise of ensuring smooth production without affecting the quality of molten iron, and solves the problem of solve the shortage of high-quality coal resources

Method used

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  • Method for improving blast furnace bituminous coal injection proportion
  • Method for improving blast furnace bituminous coal injection proportion
  • Method for improving blast furnace bituminous coal injection proportion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Use a sealed fan to purge the coal mill, bag box and pulverized coal bin with nitrogen for 5 times to discharge the air in the pulverizing system, and then keep the flow of nitrogen at 6000m 3 / h, the content of foreign gas in the nitrogen of the milling system is ≤8%;

[0056] 60 kg of anthracite (performance parameters are shown in Table 1) and 40 kg of bituminous coal (performance parameters are shown in Table 2) were fed into two batching hoppers through the crane respectively, and then passed through the open coal feeder, flat belt, large The inclination and reversible belts are transported to the raw coal bunker, and then transported to the coal mill through the closed coal feeder, and the pulverization is carried out through the grinding rollers and grinding discs in the coal mill to obtain the injection coal; then vacuumized by the exhaust fan, The pulverized coal is transported to the bag box, and then the pulverized coal (performance parameters are shown in Ta...

Embodiment 2

[0059] The same as the method of Example 1, the difference is: the air supply temperature of the blower is 1240 ° C, and the oxygen enrichment of the air supply is 9800m 3 / h.

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Abstract

The invention belongs to the technical field of blast furnace smelting, and particularly relates to a method for improving the blast furnace bituminous coal injection proportion. The invention provides the method for improving the blast furnace bituminous coal injection proportion. The method comprises the following steps: smelting in-furnace sintered ore, in-furnace pellet ore, in-furnace lump ore and in-furnace coke under the injection of injection coal; the injection coal comprises the following components in percentage by mass: 60-65% of anthracite and 35-40% of bituminous coal; The initial crushing strength M of the in-furnace coke is greater than or equal to 91%, and the crushing strength after smelting is greater than or equal to 60%. Results of the embodiment show that the method provided by the invention can enable the proportion of the bituminous coal in the blast furnace injection coal to reach more than 40%, and on the premise that smooth production is ensured and the quality of molten iron is not influenced, the use amount of low-quality coal is increased, and the problem of shortage of high-quality coal resources is solved.

Description

technical field [0001] The invention belongs to the technical field of blast furnace smelting, and in particular relates to a method for increasing the blast furnace bituminous coal injection ratio. Background technique [0002] Due to the limitation of natural resources and technical conditions, my country will still use the blast furnace ironmaking process to produce pig iron for a long period of time in the future. Therefore, blast furnace ironmaking technology will still play a leading role in ironmaking production. However, due to the shortage of coke resources in the country, blast furnace production is currently under great pressure from investment, resources, cost, environmental protection and other aspects. Therefore, it is an inevitable trend in the development of blast furnace ironmaking technology to vigorously develop coal injection technology, replace coke with coal, and reduce costs. [0003] At present, PCI coal is mainly used in combination with anthracite...

Claims

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Application Information

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IPC IPC(8): C21B5/00
CPCC21B5/003C21B5/007C21B5/008
Inventor 刘瑞坤梁鹏张晓利高鲲
Owner TANGSHAN DELONG STEEL CO LTD
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