South African engineering firm opts for cogeneration

Smelter engineering firm Metix has developed a power-saving solutions that enables cogeneration.

Metix, a subsidiary of German group SMS Siemag, plans to generate power with a process gas-fired boiler combined with a turbine and a generator unit.

“The boilers burn LCV process gas in a combustion chamber. Our standardised boiler is a two-pass boiler. The first pass is the combustion chamber and the heat exchangers (superheater, evaporators and economisers) are located in the second pass,” says Metix deputy sales director Klaus Schmale.

Metix says Turkey-based ferrochrome producer Eti Krom has ordered this type of energy- recovery solution from Metix for use in two semiclosed ferrochrome SAFs. Each furnace is equipped with one waste-heat boiler.

The system is expected to start up early in 2013 and will produce steam, which will be used in a steam turbine with an attached power- generation unit to produce 5 MW of electrical energy.

With this system, Eti Krom expects an amortisation period of less than three and a half years.

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