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Customer Needs
In the power industry coal is a major source of fuel. Often the coal used has high sulphur content. This type of coal creates a large amount of fly ash. If the fly ash is not kept hot enough in the boiler the ash will stick to the tubes and act as an insulator reducing the efficiency of the boiler. In addition the fly ash can build up so thick it can form huge balls which break loose and fall into the boiler and destroy other tubes. This ball can weight as much as 2 tons.(1800 kg).
The solution to the problem is to measure the hot fly ash in the tube area of the boiler. If the ash is not the right temperature the operators can increase the firing or add cleaner fuel to increase the temperature. Since the gases in the boiler are full of fly ash they are opaque to any infrared thermometer. The ash temperature could be measured with Mirage 20 or OR series. The InfraRail type S would also work. Be sure to add an air purge and water-cooling. Usually at least two instruments are installed, one on each side of the boiler.
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