HMIP tightens up on NOx limits for gas turbines

Stricter standards for emissions of nitrogen oxides from gas turbines have been proposed by HM Inspectorate of Pollution (HMIP).1 The move reflects advances in low-NOx combustion technology, but is expected to be opposed by turbine suppliers and operators of industrial combined heat and power (CHP) plant.

The proposals come in revisions to an existing guidance note on gas turbines with an aggregated net thermal input of over 50MW. The original version was issued in January 1991, and the affected processes came under integrated pollution control (IPC) in April 1991.

Since then, several manufacturers have made considerable advances in burner design. HMIP has revised its guidance to effectively define such low-NOx systems as the "b

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