EnviroEnergy – July 2019

A reminder of how it all started. A district heating scheme to be powered by burning coal (cleaner air in the city needed the coal to be burned in a controlled way) and district heating would be relatively cheap to install when St.Anns was being re-built. (A separate scheme for The Meadows was not to be so successful.)
It was soon converted to burning waste – 100 kilo tonnes is incinerated, (a further 80 kilo tonnes recycled) providing steam at 800 degrees and 30 barrs. 10MW of electricity is supplied to a local private wire network (59 GWh per year) and the condensed steam providing 141 GWh of heat to the district network of 95km of pipes at 85 and 100 degrees at 10 Barrs to 4,800 customers in St.Anns. An infra-red survey of the neighbourhoods from a drone found cracks in the pipes that lost 120 metres cubed of water every day, and repairs triggered have reduced the loss to 10 to 20 metres cubed. All this is heavily regulated.
More could be done to re-use material (e.g. more maintenance that simply replace, use less plastics in the first place, re-process wood and fibre), reduce the amount to be disposed (e.g. the recycling of food waste was lost cos of revenue cuts), extract more materials for re-use (e.g. gasification can extract a greater range of metals; bio-digestion to create gas for burning and compost for soil) but these technologies need new investment and subsidy (most sensibly from taxing the creation of waste). Extracting energy from waste still beats the burial of waste and there will be plenty fo waste to be incinerated for a long time into the future.
Profits for the last year of £487k was reported.
ENGINEERING NUMBERS TO BE RE-CHECKED

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