7. How Does My Wood Pellet System Work ?
The TR Engineering Ltd Biomass Heating System introduces state of the art technology to
a very simple process. The basic steps of how the system works are illustrated later in this
chapter.
7.1 Sensors
On the TR Engineering Ltd system there are 8 sensors which provide the Boiler
Management System with the information it requires to control the processes. These are :
•Flue Gas Temperature Probe - measures the temperature of the exhaust gases
in the flue.
•Water Temperature Probe - measures the temperature of the water in the
boiler.
•Photocell - measure the light value (flame) in the burner.
•Pellet Level Sensor - gives a signal to the controller when the hopper
has reached a low level of pellet.
•Burner Cleaning Sensor - gives a signal to the controller when the
cleaning mechanism on the burner has fully
retracted.
•Door Switch - gives a signal to the controller that the ash pan
door is open.
•Pellet Feed Safety Thermostat - signals the controller if the temperature in the
pellet feed pipe reaches an unsafe temperature.
•High Limit Safety Thermostat - signals the controller if the water temperature
has reached an un-safe temperature.
7.2 Combustion Process
The combustion process to ignite and burn wood pellets cleanly and efficiently is
summarised on the following flow chart :
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