STANDBY GENERATORS
partial burn fuel resulting from light load running of the set. HTM guidance suggests the use of
Diesel Particulate Filter (DPF) to help reduce some of the other smaller carbon elements present in the exhaust gas stream. The need for such devices is not based on EA guidelines or requirements for emissions aftertreatment. A decision on the inclusion of such a unit should only be taken once a full assessment of the emissions of the specific engine model has been completed. Many more modern engines come close or exceed all current requirements. The inclusion of a DPF does though add significant risk to the resilience of the generator. DPF units are prone to carbon- soot build-up which is typically formed by engine operation at low generator load levels. Blockage of the DPF core is proven to be detrimental to the long-term reliability of the diesel engine, the long-term high backpressure imposed on the engine can result in premature engine failure. Periods of off load or light load running should be avoided when a DPF is fitted. Regular testing at high levels of load is essential to ensure the DPC is not blocked. Other exhaust gas treatments are available including a Diesel Oxidation Catalyst (DOC) which can offer reductions up to 60 per cent of CO and 40 per cent of HC.
A full EA assessment should be undertaken prior to adding any new standby generator capacity to site; and should include reviewing the emission performance of the engine of any potential vendors
A full EA assessment should be
undertaken prior to adding any new standby generator capacity to site. This assessment should include reviewing the emission performance of the engine of any potential vendors and this information used to inform the need or otherwise for the inclusion of any exhaust gas after treatment equipment may or may not be requited.
16.8 TESTING – Voltage Regulation The HTM-06 section 16.8 indicates that the generator terminal voltage on starting should not overshoot the nominal terminal voltage by more than 15 per cent, and return to within 3 per cent of the rated voltage within 0.15s. The generator terminal voltage should not vary by more than 15 per cent following a step load increase from 0 per cent load to 60 per cent load, and then return to within 3 per
cent of the rated voltage within 0.5s. Clarification: In this section, the HTM sets out levels of transient performance not readily achievable on a generating set unless the generator is significantly oversized for that application. Diesel Generator performance is standardised in accordance with ISO8528. In Part-5 of this standard the transient performance standards are clear set out (Ref: 9.74 comments above). Unless the set is significantly oversized it is unlikely that any vendor will comply with this requirement. WBPS and Kohler typical offer generating solutions where transient performance better than ISO8528 performance class G2.
l The white paper upon which this article is based was written with the assistance of the Project sales team at WB Power Services Ltd.
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