Level measurement of the wood chip stack.
Municipalities have asked paper mills to control the amount of dust during the pouring of the wood chips on the outside stack. This application is carried out with a Optech laser which allows to keeps the conveyor at a distance of 10 feet from the level of the stack. The laser allows a better control of the distance, even in rainy conditions or extreme snow. Also, it keeps the conveyor from staying stuck in the chip stack.
Drexelbrook blocking switches
Blockage detection in the lumberyard.
All transportation and sieving of the wood chips in the lumberyard are equipped with Drexelbrook blocking switches. This system consists of an RF admittance plate installed against the wall without intrusion. The anti-coating system eliminates maintenance. This is the most used system on the market for this type of application.
Hydraulic pump flow measurement.
In the lumber yard, there is a lot of hydraulic machinery. To check if the hydraulic pump is failing, a turbine is used. When the pump will fail, the flow rate will decrease and not the pressure. Flow monitoring helps plan downtimes for maintenance. This system saves on downtimes.
Foxboro flow measurement
Flow measurement of the pulp in the black liquor section.
Flow measurement in this section of the plant is very special. The consistency is very high and the process is very corrosive. Foxboro has a AC digital technology flowmeter that works well with this particular process. The Foxboro AC digital tube has no problem reading high consistencies. For corrosion, it uses Hastelloy C conoïdal electrodes which are easier to clean and prevents clogging that this process generates.
Black liquor concentration.
Before burning the black liquor in the boiler, one must know its concentration. LSC is approved for this type of application. This refractometer uses the refraction of the light to determine the concentration. It is a reliable and recognized system for this type of application.
Thermo gamma system
Density measurement during caustification.
This gamma system is used to read the density of different chemicals that are components of the white and green liquor. It is an instrument with a very long lifespan and it has a very stable reading. It is not influenced by chemicals since it is mounted on the outside of the piping.
Drexelbrook level sensor
Level switch in high consistency pulp.
Drexelbrook has the best level sensor for high consistency pulp thanks to its anti clogging system adjusted for each application. Even if the level clogs the top of the tank, the sensor can differentiate between the clogging and the real level.
Measuring the stretch of the paper.
Measuring the stretch of the paper is done between the third press and the dryer using a Optech laser installed at a 5 to 10 degree angle. Any variation is seen by the laser which transmits a continuous analog signal to the control system. Allows for automatic control and less breakage at the machine.