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World Cement,

Georg Lechner and Andreas Renetzeder, Scheuch Group, describe the process of converting electrostatic precipitators at Siam Cement Group’s Kaeng Khoi site to bag filters with emc technology.

Dedusting in the cement industry has been advanced through the use of emc filter technology. After converting the Khao Wong kiln filter in 2016, The Siam Cement Group (SCG) in Thailand is one customer that has gone on to equip four kilns at the Kaeng Khoi site with Scheuch’s bag filter technology.

The two filters for kilns Kaeng Khoi 5 and 6, each with a gas volume of 981 500 m3/h, were put into operation in 2020, while the filter systems for clinker kilns Kaeng Khoi 3 and 4, with a gas volume of 820 000 m3/h, were commissioned in 2021. It was back in 2016 that Scheuch began converting electrostatic precipitators to bag filters for SCG. With this project, Scheuch presented the customer with its bag filters, featuring emc technology and high fail safety, a local partner, as well as an effective conversion concept.

The core components

For the Kaeng Khoi kiln filter systems, Scheuch developed a concept together with SCG that was tailored to the company’s requirements. Naturally, it was important that local standards were taken into account. Scheuch provided its expertise and core components, ensuring high standards of quality.

Eco Plant Services Co. Ltd., a local subsidiary of SCG, took care of manufacturing and smooth installation on site. In addition, the Thai Scheuch branch, Scheuch Asia Ltd., supported the customer in its national language, which made cooperation far easier. Even in the era of COVID-19, the customer requirements were fulfilled thanks to the local service teams. As such, the project was not affected by the travel restrictions that had been particularly limiting for many companies.

Achieving low emission values

The existing electrostatic precipitators in Thailand must be gradually brought up to the applicable regulations and emissions limits for new filter systems. Scheuch’s bag filter systems help to ensure low emission values, reduced energy consumption and minimal maintenance requirements. The emc filter technology offers consistently good filtration performance, even in the case of fluctuating operating parameters in the clinker kilns. This is an advantage compared to electrostatic precipitators, where fluctuations in emissions cannot be avoided and where – in the worst-case scenario – kilns have to be shut down if carbon monoxide levels are too high. In addition, Scheuch’s multi-compartment concept, where the bag filter is divided into individual chambers, ensures kiln availability of more than 99%.

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