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Press Release Ref: PC625
Procal Analytics have recently supplied several systems to monitor the pollution from gas turbine power stations. The customer, to meet the Environmental Agency’s monitoring requirements, selected the PULSI 200LR multi-component in-situ infrared stack gas analyser. The instrument was bought to replace extractive chemilluminescent analysers, which required a high level of maintenance both to the instruments and the associated sample handling equipment.
The PULSI 200LR was selected because of the customer’s requirement for, not only a reliable system, but also one that could be easily verified to satisfy the Environmental Agency. The PULSI 200LR not only simultaneously monitors the NOX but also SO2, CO, CO2 and water vapour. This enables the instrument to report the pollutant levels, either on a dry or wet basis. The PULSI 200 CEM analyser is mounted on the stack with an in-situ enveloped sample cell, which the flue gas freely passes through.
Range 1: SO2 0 to 200ppm
Range 2: NO 0 to 500ppm
Range 3: NO2 0 to 250ppm
Range 4: CO2 0 to 15%
Range 5: Water Vapour
0 to 50%At a predetermined interval, compressed instrument air is allowed to flow into the in-situ sample cell forcing out the flue gas, this enables the analyser to automatically zero. Periodically, either manually our automatically, certified test gas can be introduced to demonstrate the analyser’s accuracy to the Environment Agency. The stack mounted analyser is then connected through a Modbus link to Procal’s industrial PC (ACU) or to a conventional desk top PC running ACU for Windows, where the concentration of each measured component along with other data such as sample temperature and pressure and alarms status is displayed.
The system does not require any consumables and has a better than 95% availability. Typically, on gas fired power stations, the instrument would be checked on a quarterly basis, the system diagnostics would warn of any component deterioration ensuring maximum instrument availability.
February 1999
