ENGINEERING: Actom Contract At De Hoek's Cement Plant
Recent Western Cape Business News
SOUTH AFRICA’s largest cement producer Pretoria Portland Cement (PPC) recently awarded a turnkey contract to Actom Air Pollution Control (formerly MikroPul) to replace an existing kiln six electrostatic precipitator with a reverse-pulse bag filter at the company’s De Hoek cement manufacturing plant near Piketberg in the Western Cape.
The supply and installation of the new 350 000 cubic metre an hour capacity bag filter to de-dust kiln 6 and raw mill 6 at the factory forms part of the extensive upgrade at De Hoek and expansion plans in the Western Cape, including replacement of kiln shell sections and riding rings, replacing the existing satellite cooler with a new generation grate cooler and conversion of the existing coal-firing system to a new indirect coal-firing system, together with the installation of a new multi-channel kiln burner.
The contract, which was awarded to Actom Air Pollution Control at the end of May this year, includes design, manufacture, supply, installation and commissioning. Site construction is scheduled to commence at the beginning of 2012, with the bag filter due to be commissioned in June 2012. The bag filter, which will be fitted with glass fibre bags that are capable of withstanding temperatures of up to 260 degrees C, will be designed to reduce dust emissions in line with minimum emission standards as contemplated in Section 21 of the National Environmental Management: Air Quality Act.
Gerard Pretorius, Actom Air Pollution Control’s sales manager, says the bag filter and associated equipment to serve the main kiln and raw mill will have higher gas volumes than the existing equipment. “This applies not only to the bag filter, but also involves replacing the existing forced draft fan with a higher capacity induced draft fan and installation of a new material handling system to collect, transport and feed the collected dust back into the clinker production process,” he says.
“This contract also poses quite a challenge for us as we have to custom-build much of the new equipment to fit into the footprint occupied by the existing equipment. A part of the PPC tender brief was to limit any major changes to the existing concrete structures supporting the old electrostatic precipitator. This will be achieved with only minor changes being made.”
He says Actom has a great deal of experience to draw on to implement the PPC de Hoek turnkey contract, as it has successfully installed and commissioned similar equipment for cement producers in the past.
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