Enerji is working with a smelting partner to investigate recovery of waste heat from silicon production processes.
Silicon is produced from pulverised quartz in large electrical arc furnaces. The high purity silicon produced is used world-wide in metallurgical, silicone and semiconductor industries.
At paper mills, wood is pulped, treated, pressed and rolled to create paper for newspapers and magazines. Steam is used extensively in the mill to soften wood fibres during pulping, along with a range of other processes. At Enerji's paper-milling partner, the steam boiler is fired by coal trucked to site over long distances.
Enerji has analysed the movement of heat through the mill and identified a number of opportunities to capture, redirect and re-use heat that would otherwise be wasted. Enerji will use a range of technologies to harvest heat from steam production and pulping processes, reducing the mill's consumption of coal and electricity from the grid.
Steel refineries convert iron ore into billets of raw steel using high temperature smelters. Enerji's steel refinery partner produces most of its own electricity from gas-fired generators, and has extensive networks for the reticulation of steam about the site. The size of the operation is such that the mill will frequently export electricity to the grid, and supplies nearby satellite mining operations.
Heat is recognised as a highly valuable resource, and the refinery already implements a range of solutions to bring useable heat to where it can be most effectively utilised. Nevertheless, Enerji's ATEN technology is able to harvest heat from remaining sources previously considered 'low grade'.
Enerji continues to work with the refinery to identify opportunities to produce the greatest return on investment.
Mine site power generation
Mines tis in Western Australia are typically powered by large gas-fired engines, and Enerji's power generation partner is no exception. Like almost every installation of its kind, the exhaust from the mine's engines is currently vented directly to the atmosphere.
Power generation represents a simple case for Enerji's ATEN technology. Building on experience gleaned from our Carnarvon project, Enerji will redirect exhaust flow through a modularised heat exchanger, generate electricity from the harvested heat and feed that electricity back into the mine's distribution network. The additional power will allow the gas engines to use less fuel, reducing power generation costs and significantly reducing emissions.
Carnarvon – Prototype testing completed
After working closely with Opcon to develop the Australia-adapted 3rd generation Powerbox, Enerji installed 3 heat recovery units and a Powerbox at the Carnarvon Power Station in late 2012.