The drum deck is sectionalized into individual division strips to control vacuum without losses. Each section is an integral vacuum zone that prevents the leaking of vacuum from one zone to the next. Each section has its own filter fabric, support grid, and filtrate piping often positioned in leading and lagging parts of each section. This design promotes high hydraulic rates out of the filter.
The filtrate pipes welded to each section are then turned through the inside of the drum to the the non-drive side drum trunnion called the filtrate end. The filtrate pipes are welded in an equally spaced pattern to a pipe plate. The pipe plate is in effect a manifold for all of the filtrate pipes.
Rotary drum vacuum filter is a very important tool for solid-liquid separation; it has various applications in the industrial field. The main advantage of this equipment is its relatively small space, low cost and easy to be maintained. All Rotary Vacuum Filters operate on a similar principle. Several stations have specially designed rotary vacuum filters capable of producing wallboard grade gypsum with a filter cake moisture content of less than 10%. The K-S High-Rate FGD Drum Filters operating at CWL&P Dallman, TECO Big Bend, and NB Power Coleson Cove 1. Vacuum filters – These include rotary drum filters and horizontal belt filters. Both are continuous operations. Both are continuous operations. Rotary Drum filters – these are horizontal drums with perforated exteriors covered with a filter cloth and internal vacuum pipes that are designed to be partially submerged in a trough of liquor. The Auto-Vac® Rotary Vacuum Drum Precoat Filter (RVDF) is Alar's flagship dewatering technology. Learn more by visiting: https://www.alarcorp.com/auto-vac/. 1.1 ROTARY VACUUM DRUM FILTERS The Rotary Vacuum Drum Filter belongs to the bottom feed group and is one of the oldest filters applied to the chemical process industry. Therefore rotary vacuum drum filters are certainly used in to the best part of solid liquid separation process. The Figure 1, shows the basic structure of the rotary vacuum drum.
Mounted tight against the rotating pipe plate is a stationary rotary valve that has a sacrificial wear plate which takes the friction between the pipe plate and the valve body. The valve body not only directs the liquid filtrate away from the drum. It also allows for vacuum control in the sections of the drum, to segregate cake formation from cake drying from cake washing to cake discharging. This vacuum control is called the “timing” of the vacuum with the use of adjustable bridge blocks within the valve’s internal cavity. The location of the bridge blocks allows control of vacuum where it is most useful and then, with certain designs, to cut off the vacuum when the cake must be discharged.
To segregate cake formation from cake drying, the drum is commonly submerged from 10% up to 37.5% in the slurry. During cake formation, the vacuum applied deposits suspended slurry solids on top of the filter fabric. During cake drying, the vacuum continues to be applied to the filter cake. The cake now creates a pressure differential that dries the cake to low moistures. During cake discharge, the vacuum is released, and the cake is discharged several different ways: belt discharge, scraper with air blow-back discharge, precoat knife discharge, roll discharge, string discharge.
In the vat is an oscillating agitator that sweeps the bottom of the vat to uniformly suspend and distribute.
Filtrate discharging from the rotary valve flows to a vacuum receiver tank. In this tank, the air-filtrate velocity is significantly reduced to allow for separation. The air discharges to the vacuum pump through the top outlet of the tank while the filtrate discharges to a self-priming pump located at the bottom outlet of the tank.
The drum filter commonly utilizes VFD drives on the drum, on the discharge roll, and on the agitator. The production rate is directly determined by the drum speed (measured in “MPR” or minutes per revolution) and drum submergence (or vat level). However, the discharge roll and the agitator can indirectly help or hinder the rate.
Operating trade-offs often pose dilemmas for operators. High drum submergence will generally yield thick cakes. However, the moisture content may be high due to the shorter dry time. When the low cake moisture is required, then the drum submergence is reduced to offer more dry time. But then the cake thickness will be low resulting in a lower production rate.
Form time versus dry time can be precisely managed with the timing position of the bridge blocks internal to the rotary valve. High vacuum levels during cake formation increase cake thickness and yield. Compressible cakes, however, may have a high pressure differential which will reduce the production rate. If cake washing is required, the chances of cake cracking from premature dewatering is often by the vacuum level. If cake washing is critical, the wash solute will diffuse through the filter cake if the cake is thin and the vacuum flow is high.
The filter fabric selection is an important consideration. The trade-offs for operators are chemical and temperature compatibility, fine particle capture for high filtrate clarity, low blinding tendency, durability with abrasive solids, cleanability, and of course cost. This also applies to filter aids such as diatomite, perlite, cellulose, fly ash, and some process derivatives.
Rotary Vacuum Drum Filters process slurry and discharge cake in a continuous process. RVDFs can be used in waste water treatment, sludge dewatering, chemical manufacturing, the pharmaceutical industry, cosmetics, mineral mining and refining, and the food processing industry. It is ideal for a slurry with variable cake thickness, moisture content, and stickiness.
Slurry sits in a tank with a partially submerged drum. As the drum rotates into slurry, vacuum pulls the liquor through the industrial filter media, trapping the solid particles on its surface, forming a cake. As the drum continues to travel through slurry, the cake thickens.
Rotary Vacuum Filter Ppt
Rotary Vacuum Filter Price
As the drum emerges from the slurry tank, spray bars wash the cake, allowing air, water, and the remaining liquor to travel through the drum section into piping, through the valve, and into a vacuum receiver.
Rotary Vacuum Filter Working Principle
As the rotary vacuum drum filter begins to rotate facing the ceiling, it enters the drying zone. The drum remains under vacuum, pulling air through the cake for more dewatering.
Rotary Vacuum Filter Design
The drum then reaches its discharge zone as it roll to the position just over the slurry tank. Drum filters discharge in a variety of ways; scraper discharge, belt discharge, string discharge, roll discharge, and pre-coat discharge.
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