Slurry Transport Systems

Hydraulic Conveying Generally these would fall into three categories of system : Hydraulic Eductor or Ejector or Jet Pump system, which uses a water induced vacuum to evacuate material from a collection point or hopper and transfer this to a local sump.  This type of system can handle large ash lumps (up to 50mm) but is limited to around 30 tph transfer rate and 200 metres distance.  Water to ash ratio is around 4:1 by volume.

Conventional Lean Slurry system, which uses a motorised pump (generally centrifugal) to transfer a water / ash mixture at high throughputs over long distances to an ash pond or lagoon. This can also handle both very coarse and fine ash with lumps of up to 50 mm.

More modern High Concentration Slurry Disposal (HCSD) system which uses significantly less water, using 15% water or less by weight, and is used generally to transfer high throughputs of fine fly ash over very long distances using high pressure diaphragm pumps with velocities of around 2 m/s.  Systems such as this have been installed for > 10 kilometre transfer distance.  Ash disposal at the ash mound is very simple as the ash solidifies easily into an inert mass and the system does not produce the waste water problems or leachate problems normally associated with ash lagoons.