Ash Cooling Screw Installed

25th February 2020

The ash cooling screw has been installed on site. This takes hot ash from the gasified waste and cools it to a safe temperature so that it can be stored ready for disposal.

Ash is made up of the components of waste that will not gasify. Examples include the calcium carbonate used as a filler in paper and inorganic nutrients in wood such as potassium and iron. In the RadGas process, most ash is vitrified to produce an inert aggregate. The residual ash is captured, cooled, and then sent to hazardous landfill.

The screw system has a water-cooled jacket and auger that rapidly cool the ash to below its auto-ignition temperature. It is purged with carbon dioxide to minimise the risk of pyrophoric reactions occurring.

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