Pulverized coal distributor for coal-fired blast furnace

Abstract

The invention relates to the technical field of coal-fired blast furnaces, and discloses a pulverized coal distributor for a coal-fired blast furnace. The pulverized coal distributor comprises an airinlet main pipe, wherein a bottom inclined body is fixedly mounted at the top of the air inlet main pipe, and an upper sealing cover is fixedly mounted at the top of the bottom inclined body through bolts. Through the arrangement of a first distribution chamber, a movable vertical pipe and a second distribution chamber, primary air entering from the air inlet main pipe and pulverized coal carriedby the primary air are divided into two parts with different concentrations, concentration separation of the pulverized coal is achieved, after the pulverized coal is uniformly distributed in the first distribution chamber and the second distribution chamber, the pulverized coal is conveyed into a boiler from a first distribution air pipe and a second distribution air pipe, the ignition temperature and the ignition heat of the concentrated pulverized coal are low, so that the concentrated pulverized coal is ignited firstly and then the low-concentration pulverized coal is ignited, and the low-load warm combustion capacity of combustion is improved; and meanwhile, stable ignition of inferior coal can be realized, the combustion efficiency is improved, the blast furnace operation cost is reduced, and the utilization rate of inferior coal is increased.

Description

technical field [0001] The invention relates to the technical field of coal-fired blast furnaces, in particular to a pulverized coal distributor for coal-fired blast furnaces. θ Background technique [0002] The pulverized coal distributor refers to the device that evenly distributes the primary air and pulverized coal to the subsequent primary air ducts in the direct-blowing pulverizing system. Figure 7 , the mixture of wind and pulverized coal enters the distribution box 2 from the air inlet main pipe 1, and then spreads evenly in the distribution box 2, and then is transported to the burner through the primary air pipe 3, and is ignited in the boiler, but the pulverized coal distribution There are certain deficiencies in the use of the device, as follows: [0003] At present, during the operation of the coal-fired blast furnace, the pulverized coal enters the boiler through the burner with the primary air for combustion, but there is a certain speed difference between t...

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Problems solved by technology

[0003] At present, during the operation of the coal-fired blast furnace, the pulverized coal enters the boiler through the burner with the primary air for combustion, but there is a certain speed difference between the wind and the pulverized coal during the transportation process, so that the concentration Decrease, so that the concentration of pulverized coal that enters the boiler through the burner after distribution is lower than the optimal ignition concentration, especially for low-volatility coal, in order to reduce the heat of ignition, the concentration of pulverized coal transported is often increased by reducing the primary air rate, but it is too low The wind speed is easy to cause the pulverized coal to accumulate in the pipeline, resulting in a blockage of the primary air duct, so the wind speed has to be increased, which makes it difficult to catch fire. At the same time, the traditional pulverized coal distributor distributes the pulverized coal evenly into the boiler, and cannot distinguish The over-rich combustion and over-lean combustion make the incomplete combustion of pulverized coal, resulting in NO X Emissions increase, and the loss of incomplete combustion of pulverized coal increases, reducing the thermal efficiency of the boiler unit

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