Shandong Dongtai specializes in the production of conveyor guide troughs, rectangular mouth guide troughs, and bell mouth guide troughs.

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1. Analysis of the causes of dust generation at transfer points
&The coal drop pipe structure designed with the traditional "material abrasive" guiding ideology causes the material to be too dispersed during operation, resulting in impact and extrusion between materials, resulting in a large amount of dust. The strong induced wind generated by the high-speed falling of materials is the main cause of dust generation. The high induced wind speed in the guide trough reduces the efficiency of the dust collector. The sealing performance of the guide trough is poor, and the dust is guided to the material under the positive pressure generated by the induced wind. Spread around the trough, the guide trough cannot establish a negative pressure state, and dust spreads everywhere. The material at the traditional design blanking point has serious impact wear on the sealing plate of the guide trough, and the incorrect blanking point and other reasons cause the phenomenon of coal scattering. Various types of used Dust collectors are all restricted by the characteristics of coal, have large energy consumption and maintenance workload, and generally have low dust removal efficiency
2. Comparison of current dust removal technology and equipment performance
, charged precipitator (electrostatic precipitator)
/> Electric charge dust removal technology has higher dust removal efficiency when dealing with resistivity dust. When the resistivity is less than & greater than &, the dust removal efficiency will decrease. The specific resistivity value of raw coal measured by the needle plate method, parallel disk method and concentric circle method is above &, so the electrostatic precipitator technology should not be used in the coal conveying system. Two issues need to be paid attention to when using it: First, the coal dust that has lost its heteropolar charge or is not captured will return to the airflow, causing secondary pollution; second, the coal dust after being charged is more likely to settle in the alveoli. and bronchus, the third harm to the human body is the need to prevent spontaneous combustion and explosion of lignite and bituminous coal with high volatile content.
, Bag dust removal
Bag dust removal technology uses a filter device to capture dust. It has high dust removal efficiency and is suitable for filtration and dust removal of dry materials. For dust control in the coal conveying system, since raw coal itself contains internal and external moisture, after using bag dust removal equipment, dust containing moisture can easily be adsorbed in the filter bag and adhere to the surface of the filter material, whether it is It is difficult to remove the dust adsorbed into the filter material by heating, shaking and pulse backflushing the filter material. Over time, the resistance of the dust removal system increases, and the filter material can only be replaced frequently, which increases maintenance and operating costs. Therefore, this technology is generally not suitable. Suitable for dust control at transfer points of coal conveyor belts.
Water mist dust removal
Water mist spray and steam capture technology is to install high-pressure nozzles in the guide trough, so that the water mist or steam sprayed out can act on the dust, humidifying the dust or removing the dust. Adsorbed on the surface of water droplets. It increases the mass and is captured under the action of gravity. The disadvantages of this technology are: first, it is a waste of water resources; second, it needs to be dried after increasing the humidity, which wastes energy; third, there are flaws in the design of the water mist control system, and the automatic control system It is not combined with the moisture content of coal, resulting in serious waste
Wet dust collector
Wet dust removal technology and bag dust removal technology both arrange several straws on the guide trough to form a certain degree of dust in the trough. Negative pressure, the sucked dust-containing gas is purified by the dust collector and then discharged into the air. Due to different purification devices, the effects obtained are also different. There are many types of wet dust collectors, and the dust removal efficiency is also high. Due to the different places and methods of use, the dust collector used for dust control at the transfer point of the coal conveyor belt should be selected with high dust removal efficiency, low operating cost, and maintenance-free , a simple-to-operate wet cyclone dust collector. This type of dust collector has been used in many power plants and has very good results. However, the pipelines need to be cleaned frequently, which wastes water resources.
3. Methods for dust control at transfer points:
The control of dust at transfer points in the coal conveying system cannot achieve satisfactory results simply by modifying the dust collector, which will result in increased operating costs and increased maintenance. Large, due to the influence of factors such as pulverized coal moisture, temperature, particle dispersion, etc., it is difficult for all types of dust collectors used at transfer points to achieve sustained high efficiency. The key to dust removal at the transfer point is to first use "dispersed material collection technology" to design the coal drop pipe, reduce the generation of dust from the source, improve the sealing characteristics of the guide trough, and expand and install a non-powered dust removal unit in the guide trough. , to ensure that when the induced wind speed at the outlet of the guide chute is reduced to less than m/s, the dust at the outlet will be very small, thus achieving "treating both the symptoms and the root cause".
After years of operation, Dongtai now has a series of guide materials that meet different specifications such as II
and
series, from bandwidth
to bandwidth
slot products. It is fully proved that Dongtai guide chute is safe, clean, waste-free and highly efficient. It is very in line with the environmental protection and high performance requirements of modern enterprises for equipment. If you need a feed trough, look for Yanzhou Dongtai! Welcome to call us!
Tel: Manager Xu
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