Molten Sulphur Filtration is a critical process in industries such as sulphuric acid, sulphonation, refinery plants. The process ensures the removal of impurities which, if rest untreated could cause issues in further processing and handling and could also affect the quality of the final product.
Horizontal pressure leaf filters (HPLF) are commonly used for molten sulphur filtration. The design is typically consists of horizontal cylindrical pressure vessel with retractable shell housing, number of vertically mounted stainless steel filter leaves. Each filter leaf is provided with 5 layers of wire mesh.
The slurry is then pumped under pressure into the vessel. As the liquid passes through the wire mesh the solid particles are trapped while the filtered liquid called filtrate passes through into a collection outlet (manifold). Filter leaves are of bolted design and hence screens can be replaced very easily. After the filtration is over the heal volume in the vessel is drained out from bottom nozzle and cake is dried with steam. The filter vessel is then retracted and cake is dislodged manually or by pneumatic vibrator.
Prior to the filtration process the filter leaves are pre-coated with filter aid. This layer acts as a actual filter medium protecting the filter leaves and enhancing the filtration efficiency.
The advantages of HPLF in molten sulphur filtration is the large filtration area they provide and their capability for continuous operation. HPLF also allow dry cake discharge which can be critical factor when handling like sulphur that solidify at ambient temperature.
Post time: Aug-17-2023