Compact Press® Technology
Since its introduction to the market in 2000, Kempulp’s COMPACT PRESS® represents market-leading technology, with key features such as:
- best washing efficiency
- compact installation
- easy maintenance
The COMPACT PRESS® technology is a key component in your fibre line; suitable for system rebuilds, upgrades and modernizations.
Customer needs are changing and therefore the development of the COMPACT PRESS® technology is an ongoing process. Major improvements have been done to further improve the COMPACT PRESS® design, maintenance and performance.
Some of the improvements since the introduction are:
The COMPACT PRESS® equipment has an internal geometry which creates a controlled pressure increase as a driving force for dewatering. The controlled pressure increase allows for better washing efficiency and higher capacity. The distribution screw and the internal geometry have been further developed for improved performance at fluctuating flows or consistency. The improvements are based on experience from our over 120 COMPACT PRESS® installations and have been verified in the field.
Less area is needed for installation, pulp feed pipe has been integrated with the machine for a tighter layout, building height and platform requirements have been reduced. Components in need of inspection or maintenance have been located at the ends of the machine simplifying the layout arrangement.
Dynamic dilution and mixing of the shredded pulp has been integrated with the discharge for optimal operation conditions for the pump in the following stage, which reduces installation and operation costs.
Challenging seal areas has been eliminated by design; for remaining areas robust and reliable seals are utilized for easy maintenance. All seals including the drum bearing seals and the drum end seal have been upgraded for longer life between changes and improved performance.
With the COMPACT PRESS® design there is no need for a spare drum, as all exchange of key components such as wear rings and screen plate can be performed without removing the drum from the machine. Special attention has been paid to the critical drum bearings, which are now protected in several steps.
Principle of Operation
The incoming pulp at 3-10% is fed into the two distribution screws which distribute the pulp evenly across the machine length. The pulp is forced by the rotation of the drum into the converging volume between the drums and the flaps. The pulp is washed at relatively high consistency in the zone between the vat and the drum. Wash liquid is injected into the pulp in two wash zones per drum and the liquor is pressed out through the perforated drum.
The wash zones are designed to ensure a uniform distribution of the wash liquid which allows the wash liquid to displace the dirty liquor. Decreasing volume causes further thickening of the mat up to the press nip. After the nip a final consistency of 30 – 32 % is achieved.
After the press nip the pulp is shredded and transported by the discharge screw to the discharge where the pulp is diluted with liquor to the desired downstream process consistency. Prior to the inlet zone, spray showers clean the drum surface. All filtrate which is displaced and dewatered from the pulp mat flows through the drainage channels and is collected at the end of the drums. The filtrate flows down to the filtrate tank.
The COMPACT PRESS® Wash Press provides very high washing efficiency even at low dilution factors. This is accomplished by displacement washing at a high pulp consistency through a uniformly distributed pulp web. The high washing efficiency combined with a high outgoing pulp consistency after pressing results in excellent washing.
Both distribution screws as well as the drums have variable speed in order to give optimal washing at varying production levels.
Operation and Maintenance
A combination of well-proven components and new technology assures a trouble free, fully automatically controlled, operation. Start up and shut down sequences are DCS controlled.
The COMPACT PRESS® equipment is designed for easy access to internal components. Before inspection or maintenance the machine can be automatically flushed and cleaned. Flaps and vat are hydraulically opened for easy access by a locally operated automatic opening system, powered by a small hydraulic unit. The flaps can be opened quickly for inspection or flushing and closed again; a procedure that takes only 10 minutes.
All bearings are outside the wetted parts of the machine to ensure a long lifetime and easy maintenance access.
- Excellent washing efficiency
- High outgoing consistency
- Low steam and power consumption
- Easy operation and good runability
- High availability
- Small installation footprint and height requirements
- Minimum amount of piping
- Easy maintenance and accessibility
- Robust and reliable seal solutions