Pulverized coal burner for large vertical reduction furnace

Abstract

The invention relates to a pulverized coal burner, and particularly relates to a pulverized coal burner of a large-scale vertical reducing furnace, adopting multiple channels to deliver pulverized coal and high-temperature air as secondary air to preheat and ignite the pulverized coal. The pulverized coal burner comprises a pulverized coal distributor which is successively matched with the pulverized coal channels, a deflect-to-connect pipe group, a burner shell and a coal injection pipe group, which are arranged behind the pulverized coal distributor, wherein the burner shell is provided with a coal gas inlet, and the inner side and the outer side of each pulverized coal channel (2) are respectively provided with a coal gas pipeline and a high-temperature air pipeline. The pulverized coal burner provided by the invention has a unique structure; and as adopting the high-temperature air as the secondary air, the coal burner is beneficial to ignition and stable combustion, and can adjust flame profiles to be reasonable and regular to allow temperature fields to be uniformly distributed in a hearth, thus not only improving the combustion efficiency of the pulverized coal, but also alleviating NOx emission.

Description

technical field [0001] The invention relates to a pulverized coal burner, in particular to a pulverized coal burner for a large vertical reduction furnace which uses multi-channels to transport pulverized coal and uses high-temperature air as secondary air to preheat and ignite the pulverized coal. Background technique [0002] At present, my country has very high requirements for the uniformity of the temperature field inside the furnace of the metallurgical furnace, especially the large vertical reduction furnace used in the metal magnesium smelting industry, because the temperature condition of the thermal magnesium smelting process is controlled at about 1200 ° C, and the reduction tank External heating and internal vacuum are used, so the uneven temperature field will cause great damage to the high-temperature steel alloy reduction tank, and the consumption of the reduction tank accounts for a large proportion of the cost. The vast majority of enterprises in my country u...

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Problems solved by technology

[0002] At present, my country has very high requirements for the uniformity of the temperature field inside the furnace of the metallurgical furnace, especially the large vertical reduction furnace used in the metal magnesium smelting industry, because the temperature condition of the thermal magnesium smelting process is controlled at about 1200 ° C, and the reduction tank External heating and internal vacuum are used, so the uneven temperature field will cause great damage to the high-temperature steel alloy reduction tank, and the consumption of the reduction tank accounts for a large proportion of the cost.

The vast majority of enterprises in my country use the thermal reduction process for magnesium production, and the output of primary magnesium ranks first in the world, but most metal magnesium smelting manufacturers are only based on the thermal magnesium smelting process and simple equipment, less investment in plant construction, and low technical difficulty. Lack of thinking about the uniformity of the temperature field of the reduction furnace, the reduction of fuel consumption and the reduction of production costs and other deep-seated issues

Due to the difference in the number and arrangement of reduction tanks in the reduction furnace, there are almost no burners specially designed for metal magnesium smelting reduction furnaces, and the inhomogeneity of the furnace temperature field causes the average magnesium production rate of the reduction tanks to not be maintained all the time At a relatively high level, the damage to the steel alloy reduction tank is relatively serious, and the utilization rate of fuel is low, which greatly increases the production cost and seriously hinders the continuous development and progress of my country's thermal magnesium smelting technology.

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