The vacuum formed by the suction of the water legs is used to achieve solid-liquid separation with the help of filter media, and the filtrate of different quality is obtained through the distribution of the area of the distribution valve.It is the commonly used equipment for white water recovery and slurry concentration.When used for white water recovery, water resources can be recycled and fibers can be recovered; when used for pulp concentration, the single machine has high output and less fiber loss.The equipment performance index has reached the domestic leading level.
The fifth generation of self-developed Vacuum Drum Washer (national patent: No.ZL2008 2 0026182.X; No. ZL2008 2 0025892.0) is installed at a high position, and the suction effect generated by the water legs is used to generate a vacuum to allow the filtrate to pass through the slurry layer, which flows out from the water legs to achieve the purpose of washing.It is used in the washing of brown pulp and bleached pulp of various pulps, which can meet the needs of chemical pulp lines with an annual output of 50,000 to 300,000 tons. It is currently the preferred pulp washing equipment for small and medium pulp lines. Its performance has reached the international advanced level。
The new generation of white liquor filtration equipment in the causticization section of papermaking alkali recovery, with the help of positive pressure generated by compressed air, uses filter cloth and pre-hanging layer as filter media to complete solid-liquid separation.It can realize the dual functions of white liquor filtration and washing of the separated white mud at the same time. It is an ideal substitute for white liquor clarifier, white mud scrubber or pressure filter.。
It is used for the clarification of the original green liquor in the causticization section of alkali recovery. The original green liquor is processed by the green liquor high-efficiency clarifier to obtain clear green liquor and green mud.
With the help of the vacuum generated by the vacuum pump, the solid-liquid separation is realized by using the filter cloth and the pre-hanging layer as the filter medium.Pre-hanging technology can obtain better filtrate clarity and higher dryness under higher vacuum。
The principle of displacement pressing is adopted to realize continuous dewatering and displacement washing of pulp, which is suitable for pulp types such as chemical pulp, chemical pulp and dissolving pulp.
The spiral structure design of variable diameter and variable pitch is adopted, and different compression ratios are used for different materials.During the movement of the slurry, the volume gradually decreases, and the extruded filtrate flows through the filter plate in the pressing zone to the filtrate tank.Adjust the pressure of the back pressure device at the discharge end and the speed of the screw shaft to control the dryness and output of the discharge。