Method for reducing discharge capacity of cobble coal of intermediate-speed coal mill

A coal mill and pebble coal technology, applied in grain processing, etc., can solve the problems of coal mill fire hazard, wear, replacement or repair of the blade end of the air inlet, etc., to reduce the discharge of pebble coal and reduce the ventilation area , the effect of prolonging the service life

Active Publication Date: 2011-11-30
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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AI Technical Summary

Problems solved by technology

Because the coal will block the discharge of pebble coal, it will accumulate in the side body and cause a great hidden danger of coal mill fire.
Excessive pebble coal overflow of the coal mill will wear the end of the air inlet blade, and it needs to be replaced or repaired if the wear is serious

Method used

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  • Method for reducing discharge capacity of cobble coal of intermediate-speed coal mill
  • Method for reducing discharge capacity of cobble coal of intermediate-speed coal mill
  • Method for reducing discharge capacity of cobble coal of intermediate-speed coal mill

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Embodiment Construction

[0022] Such as figure 1 , 3 In the medium-speed coal mill shown, the high-speed rotating airflow carries the ground coal powder through the air ring and blows it to the separator. The coal powder that meets the particle size requirement passes through the separator and is sent to the boiler through the powder pipe, but does not reach the particle size. The required pulverized coal will fall back into the pulverizer for further grinding. A vertical guide ring 1 is installed at the air ring inside the coal mill. The guide ring is a continuous body without holes. A separator 2 is arranged above the air ring of the coal mill. The bottom of the guide ring is connected to On the end surface of the upper part of the air ring, the top surface of the guide ring is higher than the bottom surface of the separator 2, and the guide ring is used to ensure that the direction of the high-speed rotating airflow at the air ring is vertical upward, and is not affected by the high-speed flow fro...

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Abstract

The invention relates to a method for reducing the discharge capacity of cobble coal of an intermediate-speed coal mill. Due to the trend of diversification and poor quality of coal, the coal for practical combustion in an electric power plant is poor, and the discharge capacity of the cobble coal of the coal mill is increased obviously and the normal coal is carried over. In the method, the conventional intermediate-speed coal mill is improved. The method is characterized in that a vertically-arranged diversion ring is arranged at a vane in the intermediate-speed coal mill; a separator is arranged above the vane; the bottom of the diversion ring is connected to the end face on the upper part of the vane; the top surface of the diversion ring is higher than the bottom surface of a separator area; and high-speed rotating airflow at the vane are not influenced by horizontal high-speed airflow from a gap of dynamic and static rings through the diversion ring, so the discharge capacity ofthe cobble coal is reduced obviously.

Description

technical field [0001] The invention relates to a method for reducing the discharge of pebble coal from a medium-speed coal pulverizer. Background technique [0002] Due to the continuous development of the social economy, the society's demand for resources is growing rapidly, and the supply of electricity and coal is also tending to [0003] Due to the tension, the continuous rise of coal prices has directly caused the increase of power generation costs, while the electricity price linkage mechanism is lagging behind due to the influence of the country's overall economic environment. All these have brought huge operating pressure to power generation companies, and corporate profits have dropped sharply or even suffered losses. What power generation companies can do is to reduce unit energy consumption and minimize power generation costs. Therefore, energy saving and consumption reduction in the operation of thermal power units has become an objective need for the survival...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C15/00
Inventor 裘立春吴常苗洪道文常毅君
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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