As a leader in Separation Technology, FLSmidth is constantly looking at ways of improving operating efficiencies and ease of maintenance of our equipment. We continually develop new technologies, upgrades and programs which will enhance the performance of our customers' equipment.
FLSmidth's extensive product lines and staff of design, process and manufacturing engineers provide the experience in evaluation, specification and the fabrication of Filter Press parts and media for optimum performance in pressure filtration.
Shriver Skeleton Frame
The Shriver Filter Presss Skeleton can be supplied in side-bar or overhead plate suspension styles, 7 bar or 16 bar operating pressures (100 psi or 225 psi) and manufactured with carbon steel epoxy coated construction or with stainless steel clad frames. Contact FLSmidth to discuss your requirements.
Recessed Chamber Plates for Specific Applications
Filter plates can be supplied in a variety of materials including polypropylene with high heat and chemically stabilized resins. Corner Feed or Center feeds with filtrate, air-blow and cake wash porting arrangements to meet the application requirements are supplied. FLSmidth offers high pressure plates for 16 bar (225psi) operation and/or high temperature applications when needed.
High-efficiency membrane plates can be supplied for special applications to enhance wash effectiveness, minimize treatment chemical consumption, or minimize cake moisture. When using membrane plates, slurry is fed only during the initial fill cycle. After the feed pump has been switched off, the membrane inflation phase starts. The mechanical action of the force from the membrane plate surfaces on the filter cake is described as “squeezing” out the retained moisture from the cake. The advantages of membrane technology are that it generates higher filtration productivity through reduced cycle times, dryer cake and more efficient washing.
This increased productivity is a result of several factors:
- Cake discharge from chamber more readily than recess plates
- Differential chamber pressures are minimized by using the balanced membrane squeeze
- Improved efficiency in cake washing applications reduces wash liquor consumption
- Reduced cycle times where very long filtration times are experienced
Shriver Membrane Plate Filter Presses include all required ancillary components for pressurizing the membrane plates. These packages include squeeze water distribution manifolds, high pressure multi-stage centrifugal pumps, water storage tanks and all required valves and instrumentation for safe and reliable operation.
Filter Media Upgrades
FLSmidth's wide selection of filter media is available in a variety of materials (Polypropylene, Nylon, Dacron, Felts, etc.), in a variety of weave patterns and available with many advancements (molded rubber barrel necks, grommets, and seal edge treatments). FLSmidth’s decades of experience in pressure filtration has resulted in a complete listing of application, an extensive case-history with numerous performance evaluations of media covering a broad range of applications.
HYDRAULIC CLOSING MECHANISM – ELECTRIC TYPE
For the most demanding applications Shriver filter presses are fitted with an electrically powered hydraulic closing system consisting of a hydraulic power unit and a double acting hydraulic cylinder. The hydraulic system maintains the required pressure throughout the operating cycle. The hydraulic power unit consists of an electrically powered hydraulic pump, oil reservoir, strainer and all necessary valves, gauges, fittings, and hoses. A safety interlock of the feed pump and/or squeeze system is provided to disable the pumps until the required hydraulic pressure has been attained preventing accidental system pressurization.
Plate Shifting Mechanisms
Manual, fully automatic and semi-automatic units are available.
AUTOMATIC CLOTH WASHER MECHANISM
The Shriver fully mechanized plate shifter can be fitted with a cloth washer designed to separate the filter chambers automatically for discharge of the filter cake and provide periodic automatic high pressure washing of the filter cloth. Cloth washer systems may include wash pumps for 100 bar (1,450 psi) washing and all ancillary valves, tanks and controls.
Portable High-Pressure Spray Washers Units
FLSmidth supplies a portable highly effective cleaning system that is compact, versatile and rugged. It is ideal for spray cleaning in general plant maintenance, problem cleaning applications, and removing trapped solids from filter cloth and screens.
Process Piping Manifolds & Valves
Shriver filter presses can be fitted with feed and filtrate manifolds in a wide variety of materials to suite the process conditions. Automated filters are provided with pneumatically actuated valves that can be fitted with position indicating limit switch for feed-back to plant controls systems for condition monitoring and safety interlocks.
Automated drip trays and liquid collection launders are available in materials to suit the process conditions for the application. Drip trays are hydraulically actuated and positioned automatically from the control panel.
The cake dumpster is a standard press option that is frequently requested. The dumpster capacity ranges from 14.0 ft3 to 72.0 ft3. The dumpsters use heavy-duty casters, include self dumping features, and are painted to FLSmidth Minerals' high manufacturing standard.
Automatic Control Options
Standard and custom designed automatic control panels are available to fully automate the system for cake discharge, cloth washing, and automatic process valves and pump sequencing. Systems are available with programmable controllers and include all instrumentation and safety interlocks. Communications for plant DCS control systems is provided with Ethernet or other communication protocols to meet the site requirements.
Where full automation of the Shriver batch sequence operation is required, FLSmidth provides PLC controls with operator interfaces that include local color graphic display panels with touch-screens. Fully automated systems provide labor savings, assurance of proper equipment operation, consistency of production, reduction of downtime, and more reliable product quality.
Available Shriver automation features include:
- Opening and closing of the filter press
- Batch sequence operation of process valves
- Process feed pump control
- Automatic membrane squeezing control
- Filter cake washing cycle
- Automatic plate shifting
- Automatic filter cake discharge
- Automatic filter cloth washing
Custom Engineered Designs and Systems
FLSmidth enjoys the experience, support and resources of highly skilled process, research and design engineers, combined with decades of application experience necessary to design and implement the most efficient and most effective filtration solutions available. Our unique blend of assembly line and custom fabrication allows us to design, manufacture and assemble Filter Presses exactly suited to our customer’s specific needs and requirements.
Examples of customized systems include:
- Pre-coat Systems used to improve cake discharge in many automated systems.
- Chemical Feeding Systems used to condition, enhance or displace contaminants during the filtration process.
- Acid washing systems used periodically for media and plate cleaning.
- Flexible Core Blow Piping
Process Feed Pumps
Wide range of feed pumps for every application can be provided including basic and economical air-operated double diaphragm type, available in virtually any material to suit the customer’s requirements. (See ODS Air-Operated Diaphragm Pumps) Other more demanding installations may require electrically driven pumps and FLSmidth can assist in pump selection. FLSmidth Krebs millMax pumps are well suited for filter press feed in these applications.
Recommended Spare Part Lists and Standardized Kits
FLSmidth has developed a procedure to list recommend spare parts which are needed for normal routine maintenance, long lead time items, or parts that are subject to abuse and/or inadvertent breakage (convenience items). FLSmidth has also developed basic rebuild and maintenance kit for various components in the presses. Examples of these kits include:
- Cylinder Seal Kit
- Oil Systems Maintenance Kits
FLSmidth provides a full range of upgradeable Eimco-Shriver safety devices.
- Electronic Light Curtains
- Hydraulic Clamp Pressure/Feed Pump
- Hydraulic Pressure Drop Detection
- Safety Guards
- Splash Curtains
Caulking (pressing the cloth cord into the groove) is best accomplished using a caulking hammer and wedge. These “dead-blow” caulking hammers have a shot filled hollow head-reducing shock at the point of impact, and to wrists and elbows. The caulking hammer has a hollow rubber head which is filled with shot to eliminate rebound during hammering. These caulking hammers reduce fatigue and potential injuries when installing CGR cloths.
Examples of EIMCO specialty Tools:
- Caulking Hammer (pneumatic, standard)
- Caulking Wedge