Automatic coal flow monitor

September 2005 Flow Measurement & Control

With the increasing demand from the power industry to achieve better combustion performance and fuel economy, the ACFM-2200 automatic coal flow monitor from M&W Asketeknik collects pulverised coal samples from pneumatic transport pipes between mills and burners. The measuring results are transmitted to the control room for evaluation and control of the coal flow. The sampling operation is carried out according to ISO 9931.

The instrument provides on-line sampling and measurement with remote monitoring providing realtime data for better combustion performance and fuel economy. It allows on-line monitoring of the coal flow to the individual burners and provides on-line indication of the coal flow balance between the individual burners.

Typical applications include routine flow measurements, adjustment of fuel distribution, coal sampling, monitoring of pulverising and distribution settings in connection with low NOX burners and test firing of new coal types. Operating on 230 V, 50 Hz, the ACFM-2200 has a maximum 400 ml sample volume and is suitable for 1,5 mm maximum particle sizes. Total system accuracy is within 2,5% and power consumption is 1 kW.

The sampling unit consists of a motorised rotating sampler arm with four coal extraction nozzles. The measuring unit separates the coal particles from the extracted gas stream and collects them in a measuring tube where the volume is measured by a fibre-optics measuring device. The control unit supervises the function of all components and converts the measuring signals for display on the operator's panel. The control unit can operate up to eight sampling and measuring units according to the requirement. M&W Asketeknik is represented locally by OEN Enterprises.

For more information contact Noel Bauchop, OEN Enterprises, 011 675 4447, [email protected], www.oenenterprises.co.za

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