Negative-pressure pulverized coal preparing system

Abstract

The invention relates to the technical field of fuel preparing, in particular to a negative-pressure pulverized coal preparing system used for improving the pulverized coal drying efficiency and increasing the energy utilization rate. The negative-pressure pulverized coal preparing system is characterized by comprising a conveying belt, a raw coal bin, a coal feeder, a coal mill, a dryer, a powder collecting bin and a coal-fired furnace; a discharging port of the coal mill communicates with the dryer; the dryer comprises a case, a pulverized coal inlet is formed in the upper end of the case and communicates with the discharging port of the coal mill, and a platy drying device is fixedly connected in the case; and a scattering device is rotationally connected in the case, the case is provided with an extraction opening, the extraction opening is located below the scattering device and connected with a centrifugal fan, and the bottom of the case communicates with the powder collecting bin. The negative-pressure pulverized coal preparing system has the beneficial effects that the pulverized coal can be prevented from being gathered into small particles, and the pulverized coal drying efficiency and quality are improved.

Description

technical field [0001] The invention relates to the technical field of fuel preparation, in particular to a negative pressure pulverized coal preparation system. Background technique [0002] Burning coal to obtain energy is still one of the main ways of obtaining energy in my country at present, and its proportion accounts for more than 50% of the total energy. Therefore, promoting the clean and efficient use of fossil energy such as coal has a great significance at this stage. Significance. High-efficiency and environmentally friendly pulverized coal boiler is a key energy-saving technology project promoted by the state. It has the characteristics of high efficiency and energy saving, clean emission, high level of automation, and environmental friendliness. It is of great significance to promote the clean and efficient utilization of coal, improve the atmospheric environment, and develop energy-saving and environmental protection industries. [0003] Since coal contains a...

AI Technical Summary

Problems solved by technology

In the prior art, the heat generated by burning self-produced pulverized coal is mainly used to dry the pulverized coal, and the coal is deliberately burned only for drying the pulverized coal, resulting in a waste of energy

The temperature of the flue gas produced by the power plant boiler is still about 130 degrees Celsius. This part, the existing technology does not have many ways to utilize the waste heat of this part of the flue gas. Usually, it is directly discharged into the air after being processed, which causes a waste of energy.

[0004] At the same time, in the prior art, since the pulverized coal has a certain amount of moisture before drying, it is easy for the pulverized coal to aggregate into small particles, and the small particles will not only affect the drying rate and drying effect of the pulverized coal, but also affect the normal combustion

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