Sieve Bend Screen Project Case
On November 3, 2019, our technical team visited a coal washing plant in Shanxi Province, China, On November 3, 2019, our technical team visited a coal washing plant in Shanxi Province, China, and successfully installed our specially designed sieve bend screen (DSM screen) products in their coarse slime washing system.
They sent feedback today:
After our transformation, not only the moisture content of the coarse slime is reduced by 7%, the profit of the whole year’s commercial coal is expected to increase by 1.2 million US dollars, but also the noise of the workshop is greatly reduced, and the consumption of electric energy and materials is saved.
Before the transformation, there was only one set of high-frequency screen in the coarse slime dewatering equipment of the water washing system of the plant.
The high-frequency screen is responsible for cleaning water recovery in all areas of the plant and sludge pumping in the sewage plant, with a total of 8 incoming materials. In normal production, due to the low feed concentration and unstable feed, the moisture content of coarse slime is on the high side.
When there are more than three simultaneous incoming materials, it will lead to overload of high-frequency screen and water running phenomenon. It is necessary to switch the valve on site for control. Moreover, the installation of valve and check valve in the pipeline often causes pipeline blockage and requires personnel to dredge the pipeline, which is time-consuming and laborious.
To solve this problem, our technicians “consult” on the spot. After repeated research, a good way to install sieve bend screen (DSM screen) after high frequency screen is put forward.
The main materials of the coarse slime system are fed from the top of the feed box, and the rest are fed from the side, effectively avoiding the cross connection and mutual top of each pipeline.
After a period of using effect test, the sieve bend screen has three advantages.
1. After the sieve bend screen pre dehydration, the material enters the high-frequency screen for treatment, which not only completely eliminates the water running phenomenon, but also ensures that the feed concentration of the high-frequency screen material is greater than 50%, which reduces the moisture content of the coarse slime by 7%, the weighted calorific value of commercial coal increased by 5.5kcal/kg, and the profit of commercial coal for the whole year is expected to increase by 1.2 million US dollars.
2. Reduce the frequency of start and stop of high-frequency screen, and save about $40000 of electricity and material consumption in the whole year.
3. The pipeline is directly connected to the feed box, which eliminates the hidden danger of pipeline blockage, reduces the intensity of personnel operation, and reduces the noise of the workshop during parking and maintenance.
Liu Qihao, a fitter in the factory, praised the transformation. He said: “in the past, when the high-frequency screen was overhauled, because of the uncertainty of the incoming materials, it was often turned on automatically, making a lot of noise. Now with the sieve bend screen pre dehydration, greatly reducing the frequency of start and stop of high-frequency screen, reducing the noise, and working in a more comfortable mood! “
I’m glad to help a company save energy and expenses through our products and design.
We are also constantly optimizing our Johnson screen products. For coal washing plants and other coal mining industries, we have mature wedge wire screen products to provide dehydration and screening services.