For 250 years the Royal Botanic Gardens at Kew in London has been collecting tropical plants and, by careful internal climate management, growing them in the UK’s temperate climate.
Now, in Singapore, the National Parks Board has reversed the process. At Gardens by the Bay two big glass houses are home to temperate plants, which grow in Singapore’s hot and humid atmosphere by careful management of the internal climate.
The main energy source for this micro-climate is bio-waste, which comes from the Gardens’ waste and pruning of the thousands of trees in Singapore. This is then burned. The Biomass Co-generation System at the Gardens by the Bay is designed, built and operated by ecoWise Group.
Any combustion process creates toxic gases which must be controlled before release into the atmosphere. Because Gardens by the Bay is located in the heart of Singapore, great care must be taken to ensure that the flue gases are within the limits set by Singapore’s National Environment Agency (NEA).
ecoWise chose a Procal continuous emission monitoring system (CEMS) for this critical application. The Procal system is based on the reliable P2000 in-situ NDIR analyzer. This is mounted in the duct from the combustion system to the so-called Supertree structures which vent the gases to atmosphere. The Procal CEMS is on-line to NEA’s head office
The Procal CEMS measures NO, NO2, CO, CO2 and H2O. An opacity meter is also included for smoke monitoring. The CEMS was installed and commissioned in October 2011. Since then the system has not required any spare parts or maintenance. NEA require that the system is check calibrated annually. This is done by Twin-Tek Singapore Pte Ltd, who are Procal’s regional distributor for Asia Pacific.