CRS Wash Line 3.0

Purpose and description

The CRS Wash Line is intended to service laboratory digesters and bleaching reactors, being fed with either cooked wood chips or dirty pulp.

The wash line is designed for batches ranging from about 0.1 kg OD up to about 2 kg OD. This span makes it ideal for handling the output from a CRS Recycle Digester, a CRS Multi Purpose Reactor or individual autoclaves from a CRS Autoclave Oven. It can even be used to service larger digesters or bleach reactors if the washing is done in segments.

The wash line consists of a disintegrator, a large buffer tank, a screen unit and a collector tank. The wash sequence is automated, but the system requires some operator attention during operation, to make sure residue is not left in the tanks etc.

The washed pulp is collected as a partly de-watered pulp cake from the collector tank. Any rejects can be collected from the screen outlet. An easy to use touch panel controls the system.

Overview of the CRS Wash Line

Overview of the CRS Wash Line

 

Technical overview

For a quick overview see below. For more technical information see next chapter.

Charge: 0.1 – 2 kg per batch (larger amounts can be run in segments)

Wash time: 30 – 120 min from disintegration to collection of pulp (depends on charge etc)

Design temperature: 70 C

Operational temperature: app. 10 – 60 C

Materials: 316L equivalent on all process parts, 304 equivalent on supporting structures.

Schematic overview of the washline

Schematic overview of the washline

 

More technical information

The CRS Wash Line is made in stainless steel, with process parts in 316L or equivalent.

The disintegrator has an effective volume of about 35 L and the disintegration runs at a consistency of 1-2 %. The turbine is run by a motor with adjustable speed and runtime, usually 1-3 minutes. The transfer pump under the disintegrator can transfer the content in a couple of minutes to the buffer tank.

The disintegrator from above

Looking into the disintegrator

The buffer tank has an effective volume of about 400 L and the suspension is diluted there to allow for efficient screening. The rejects will be left inside the screen when the process is finished and can be collected afterwards. The level of the buffer tank is measured with a sensor and fresh water is added automatically by the control system. The temperature is also monitored.

The fibers will end up in the collector tank, which is continuously de-watered by a pump throughout the screening process.

Looking into the buffer tank

Looking into the buffer tank

 

The collector tank has an effective volume of about 60 L. It is an atmospheric tank with a cap on to prevent splashing. The outlet flow is either directed back to the buffer tank or to drain, using an automatic 3-way valve. It can also be directed to a bucket in case the liquor needs to be retrieved.

Water is distributed within the wash line from a common source, which can be cold water, hot water or a mix. It is up to the customer to decide. CRS generally recommends using a mix of cold and hot water, using a thermostat or a blender on the supply line, for finding the optimal wash water temperature.

There is a spray gun mounted on the machine which can be used to clean tanks and units, both during and after the process.

The CRS Wash Line is partly run manually and partly run with automatic sequences, started from the touch panel on the machine.

The HMI control software

Example HMI program for a Wash Line

Scope of delivery and options

The standard scope of delivery includes the following:

  1. Complete wash line.
  2. Touch panel with all necessary programs installed.
  3. Required licenses for hardware and software.
  4. CE labels.
  5. Documentation
  6. Connection points for required supplies.

 

The options follow below. Some additional customization or options are always possible, please inquire.

Option 1:          Start-up & training – one week on site by one engineer from CRS, assisting with practical issues for the installation as well as doing the start-up and training of operators. The customer will need to provide the necessary resources for bringing the machine to the correct location, as well as connecting it to the supplies, but CRS can supervise where needed.

If this option is not ordered the start-up has to be done by customer. However, in such a case CRS will be happy to receive the customer in our work-shop for a one-day free training and walk-through of the machine.

Option 2:          Spare part package – a selection of spare parts aimed at giving the least possible downtime in case parts fail. Spare parts can of course be order individually at a later stage if needed.

Installation requirements & practicalities

The system has some necessary requirements that need to be fulfilled in order to run it. These have to be prepared by the customer before any installation is to take place.

  1. Power connection – the requirement is a 3-phase 400 VAC 50 Hz connection at no less than 16A capacity. Other setups, like other voltages or 60 Hz, are possible but please check with CRS first.
  2. Pressurized air connection – the requirement is 6 – 10 bar, water and oil free.
  3. Water connection – a water pressure of at least 5 bar at 30 Lpm is recommended, otherwise the wash sequences will be too slow, filling times too long. Tap water quality is preferred. Supplied water has to be < 60 C.
  4. Drain connection – the drain will receive dirty wash water in large quantities.

 

Additionally there are some less critical but nonetheless important aspects to consider.

  1. Safety – the system should be used in accordance with what the risk analysis states. Please make sure that the requirements stated in that document can be met with the chosen lab setup.

The machine weighs around 1,200 kg. It will be supported by machine feet (included with the delivery). The outer measurements of the machine and the recommended floor space are shown below.

washline-room

 

To transport the machine into a room the door needs a width of at least 1150 and a height of at least 2200.