Application of Forced Scraping Technology on Disc Vacuum Filter

1 The flotation concentrate of the Babu Washing Branch of the No. 1 Refined Coal Branch was dewatered using 5 sets of PG116-12 disc vacuum filters, and was instantaneously blown to discharge. In this way, it is necessary to configure a low-pressure high-volume fan because the air volume is insufficient, and the bar washer has repeatedly updated the compressor. First use the 2YIK-27 pressure fan to replace the original EPX-39 pressure fan, and then change to the current 3L-20/3 pressure fan. After using this type of pressure fan, the unloading effect is still not ideal, due to the return wind, The moisture content of the filter cake is always higher. In order to reduce the cost and increase the production efficiency, it has been decided to use a forced scrapper to replace the instantaneous blower method.

2 The original situation The original PG116~12 type disc vacuum filter is composed of 120 fan-shaped filter plates, and the filter plate is a hollow structure. The outside is wrapped with a filter cloth, installed on a hollow spindle, and communicates with the spindle through a filtrate hole on the spindle; the spindle and the instantaneous air blowing system communicate through the pipeline. For the filter schematic. ) Drying zone (I) and blow-down zone (V) When the filter plate is in the filter zone, it is connected to the vacuum pump. Under the action of vacuum pump suction, the coal slurry is attached to the surface of the filter cloth for filtration; when the filter plate is When it is in the drying zone, it is still connected to the vacuum pump because the filter plate has left the coal slurry. The pumping action is only to let the air pass through the filter cake and take away the water in the pores to make it further dehydrated; when the filter plate is blowing When it falls, it is connected to the pressure fan and blows down the filter cake on the filter plate in the middle of the 3 working areas. The filter area (W, month (rubber friction pad design life is 12 months) , Actually only 6 months.) According to the calculation of the cableway, the annual savings can be achieved: Pulling cable to convert the cost: 47 Rubber pad translating expenses: 28 Reducing the traction cable inspection, maintenance and driver overhaul fee: 50 Saving commission Design fee: 200 Reducing (traction cables, driving machines, etc.) accidents affect production time, and more coal transportation costs 526,500 yuan compared with the previous year. Total cost savings: The original driving equipment was changed from a clamp-driver to a dual-slot drive, which not only saves a lot of materials. Infrastructure As a result, the cost of the conversion is greatly shortened, and when it is changed to a double-slotted wheel drive, it not only reduces the overall transportation cost, but also reduces the damage caused by the failure, while also improving the working environment of workers.

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