Injection method for improving pulverized coal combustion efficiency

A pulverized coal combustion and pulverized coal technology, which is applied to blast furnaces, blast furnace details, blast furnace parts, etc., can solve the problems of high proportion of unburned coal powder, high production cost, and large environmental pollution, so as to reduce the proportion and reduce the fuel ratio Effect

Inactive Publication Date: 2018-12-21
ANGANG STEEL CO LTD
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Problems solved by technology

[0003] The existing injection method has a high proportion of unburned pulverized coal, low co

Method used

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  • Injection method for improving pulverized coal combustion efficiency
  • Injection method for improving pulverized coal combustion efficiency

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Embodiment Construction

[0022] The invention discloses an injection method for improving the combustion efficiency of pulverized coal. Those skilled in the art can refer to the content of this article to appropriately improve the process parameters to achieve. In particular, it should be pointed out that all similar replacements and modifications are obvious to those skilled in the art, and they are all considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and the relevant personnel can obviously make changes or appropriate changes and combinations to the method and application described herein without departing from the content, spirit and scope of the present invention to realize and Apply the technology of the present invention.

[0023] An injection method for improving the combustion efficiency of pulverized coal. The pulverized coal in the pulverized coal bin is loaded into the injection tank o...

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Abstract

The invention relates to the technical field of iron making, in particular to an injection method for improving the pulverized coal combustion efficiency. The injection method comprises the steps thatpulverized coal in a pulverized coal bin is loaded into an injection tank in an injection system, the pulverized coal in the injection tank is delivered to coal guns located in front of an air port through a delivering medium, and the pulverized coal is injected into a blast furnace through the coal guns. The injection method further comprises the following steps that (1), flue gas preheating isconducted on the pulverized coal discharged from the injection tank; (2), compressed air is adopted as the delivering medium for the pulverized coal; and (3), the crossed spiral casing pipe coal gunsare adopted and each comprise an inner channel and an outer channel, the outer channels adopt an oxygen cooling mode, the inner channels are used for delivering the pulverized coal, the inner side ofeach coal gun outlet adopts a spiral lining, the angle that the pulverized coal is injected out from the coal guns is changed to 45-degree inclination rotation from the horizontal direction, the component velocity V of the pulverized coal in the horizontal direction is decreased by 13.4%, and the walking route S of the pulverized coal in the air port is increased by 1.414 times. The two coal gunsare adopted and arranged at the front end of the air port in a crossed mode. According to the injection method for improving the pulverized coal combustion efficiency, the pulverized coal combustion efficiency can be improved, and energy conservation and environment protection are achieved.

Description

technical field [0001] The invention relates to the technical field of ironmaking, in particular to an injection method for improving the combustion efficiency of pulverized coal. Background technique [0002] Most of the existing blast furnace pulverized coal injection uses nitrogen as the medium for pulverized coal delivery. The pulverized coal injection of a blast furnace generally consists of two to three injection systems arranged side by side. The main process of coal injection is generally to put coal powder into the injection tank from the powder bin, close the charging valve and release valve, and then pressurize the tank. After reaching a certain pressure, open the coal injection valve to blow the coal in the tank. The powder is injected into the blast furnace. After a system injection process is completed, the coal injection valve is closed, the release valve is opened, and the nitrogen in the tank is put into the upper part of the coal powder bin or the bag powd...

Claims

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Application Information

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IPC IPC(8): C21B5/00C21B7/00
CPCC21B5/003C21B7/00
Inventor 曾宇高德库李建军李晓春佟敏英刘德辉
Owner ANGANG STEEL CO LTD
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