Series bi-axial baffle automatic adjusting coal powder sorting device with returned powder grinding function

Abstract

The invention provides a series bi-axial baffle automatic adjusting coal powder sorting device with the returned powder grinding function. An inner barrel is arranged between a shell and an inner cone. A sorting channel and a powder return channel are arranged. The upper end of the inner barrel is provided with a powder return channel inlet, and a powder return channel outlet is formed in the lower end of the inner barrel. A powder return amount control device is fixedly arranged between the inner barrel and the shell. A grinding device is arranged below the powder return amount control device, and after returned powder is ground through the grinding device, the returned powder enters the sorting channel again through the returned powder channel outlet. The rotating strength of an air and powder mixture in the sorting channel is automatically adjusted through baffles, qualified coal powder is sorted out, disqualified coal powder enters the powder return channel in the device, under the condition that no coal pulverizing system is additionally arranged, the output and sorting efficiency of a coal mill are greatly improved, the coal milling unit consumption of the coal pulverizing system is greatly reduced, and the purposes of energy saving and emission reduction are achieved. The series bi-axial baffle automatic adjusting coal powder sorting device can also be applied to cement, metallurgy, petrochemical industries and the like.

Description

technical field [0001] The invention relates to a gas-solid two-phase fluid sorting machine, in particular to a coal powder sorting device with series biaxial baffles and automatic adjustment for grinding with return powder. Background technique [0002] In recent years, due to changes in the coal market price, the quality of coal used by boilers in thermal power plants is not only far from the designed coal quality, but also changes frequently, resulting in the amount of coal fired by boilers with the same load fluctuating from time to time, which in turn causes the pulverization system to fail. The output is seriously insufficient, and the fineness of pulverized coal becomes coarser, which seriously affects the safety and economy of the operation of pulverized coal boilers in power plants. In order to increase the output of the pulverizing system and reduce the unit consumption of pulverized coal in the steel ball mill, various pulverized coal separation technologies have ...

AI Technical Summary

Problems solved by technology

However, it also has problems such as easy jamming of the baffle and easy accumulation of powder; with the continuous improvement of dynamic separation technology, the dynamic separator has the advantages of a large adjustable range of coal fineness and a high uniformity index of coal powder. It is widely used in medium-speed coal pulverizers. At the same time, dynamic separation technology has also begun to be applied to the storage type pulverization system of steel ball coal pulverizers.

However, when the quality of the ground coal deteriorates, the finer the fineness of the coal powder, the greater the circulation rate, the lower the separation efficiency, and the increased resistance of the dynamic separator. These problems limit the development of dynamic separation technology.

[0003] Due to the large change of the coal quality into the furnace, the coal consumption of the boiler changes greatly. If the pulverized coal fineness remains unchanged, the amount of pulverized coal returned will inevitably increase significantly. A large amount of pulverized pulverized coal circulates between the sorting device and the coal mill, which not only consumes energy and does useless work, but also causes the resistance of the coal pulverizer to increase, thereby Therefore, in the case of meeting the requirements of the boiler for pulverized coal fineness, reducing the amount of pulverized coal returned to the pulverizer, improving the output of the coal pulverizer and the separation efficiency are of great significance to the energy saving and efficiency improvement of large pulverized coal boilers major

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