Weiliang WL-G white water filter for paper production processing
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Weiliang professional engineers will conduct an overall test on the waste paper pulp to meet different production process and equipment requirements. Weiliang consistently strives for providing the most suitable machine for customers. » Characteristics] 1. Provision of high-quality white water 2. The production capacity of each unit is 4000gpm 3. With low sensitivity to the normal production process 4. No blocking phenomena 5. Efficient removal of solid particles 6. The benefits of sealed water system: saving heat energy, reducing the fiber loss and reducing the cost of effluent treatment etc. » Easy Operation} 1. structure _ Usually the structural body uses stainless steel No.316 or No.304; It is also use stainless steel inside. This screening device is usually equipped with 100 to 325 meshes; the quantity of hole depends on the size of fiber and the conditions of water use. Usually the mesh is made by stainless steel. It also can be made by synthetic fabric if the customer needs. 2. split-flows The effluent of White water filter is divided into two kinds: the white water after filtering and fiber not having valueless (called extract!. The weight ratio between white water flowing through the mesh screen and impurity becomes split ratio, for example 90/10 refers to white water flowing into filter, 90% of which getting through the mesh screen, the other 10% extracting solution is discarded. Split ratio has change according to the type and quantity of suspended particle and mesh parameter. Split ratio of slurry (50-300ppml having low concentration is about 90/10 to 95/5. If the fiber concentration is increased, then the percentage of extract will also increase. The big mesh will produce less extract, the extract can be sent to white water system to dilute. » Design jtasis: A. Fluid:white water used for paper making B. Rate of flow:100-120m3 /h C. Viscosity:l-1.2cp D. Properties of suspended particles: paper fibre and granular additives room temperature » Discharge Liquid Requirements Meet the requirements of reuse 1. The nozzle (1mm) will not get blocked by the filtered white water, (the filter accuracy requires about 1/3 to 1/6 of nozzlel 2.The wire cloth will not get blocked by the filtered white water.( the filter accuracy recyjkes-about 1/3 of mesh screen! u The characteristic of filter to White water in paper mill is mainly displayed in the following two aspects: A . More fibrous impurity Fibrous impurity has strong penetrating power in the initial stage of filter, which is due to the length-width ratio of fiber is large, the sectional dimension in the back-end is very small in the flow process; Fibrous impurity also has strong blocked and winding ability in the later period of filter. Common filter carry through the effective filtering and thorough back washing at the same time is difficult. For example the mesh filter used in common water filtration at present, when used for paper making, the filtration efficiency is very low in the initial stage, and difficult to reverse wash cleanly in the later stage of filter. The sand filter has good filtration effect, but the back wash is almost difficult. B. More viscous particle impurity In the papermaking process.there is a large number of mineral and organic additives, these additives combined together and composed viscous particle impurity. These additive is easy to filter, but the back wash is difficult, which also limits traditional filter which used in this application. Design consideration of filter system about white water using for paper making The Requirements to Filter Due to the special characteristics of white water, the filters are required to ha' three following features: A. have high efficiency filter ability to the fiber and viscous impurity in white water B. fibre in the white water using for paper making can ’ t twine in the filter media. _ ^.C. can remove fiber and particle impurity of entrapment after backflushing efficiently. WL-G WHITE WATER F ILTER White water filter (white water screen) will cut down your expenditures of power, water, fibre, chemicals and waste water treatment, also can avoid the consequence caused by machine halt and can keep the nozzle non-blocking. The effect is so significant, so you can take back the cost soon----actually which is ok for only using six months. It will be very attractive when plus the advantage about other economic aspect. Although white water using for paper making, which have above common filtration characteristics, due to the papermaking process of each company is different, its properties of white water is also different, on the filtration system design, generally keep to the following several basises: A. The option of filter: Because of the requirements of white water using for paper making, the general filter is hard to meet the requirements, laminated filter can meet that requirement, so Weiliang Company recommend to use their own laminated filter system. B. The option of filter precision Due to the difference of size and plugging mechanism of fiber and particle impurity in the different white water, the requirements of the final effluent can also be different, so the requirement to filtration precision of the filter system is different; our design basis is the 1/3 to 1/6 of the nozzle diameter. Description of laminated filter technology relative to filtration characteristics of white water using for paper making: 1. from outside to inside of laminated filter medium having 1.4cm width, which is deep filtration medium and having high-efficiency retaining capacity to impurities including fiber particles 2. from outside to inside of laminated filter medium having 1.4cm width, the width of which is greater than the length of the fiber, so the fiber can ’ t twine on the filter lamination. 3. Auto backwash ensure the efficient thorough backwash. So we think our white water filter meet the filtration characteristics of white water using for paper making.