Design and Build of Environmental Compliance Chimney

Case study

Design and Build Environmental Compliance Chimney, Thailand

EGAT (Electricity Generating Authority of Thailand) initiated the construction of a 600MW coal-fired power plant adjacent to the existing facility in Mae Moh, Lampang, Thailand. The project aims to bolster energy generation capacity by replacing four of the existing units. It will utilise indigenous lignite as the primary fuel source and integrate supercritical pressure steam generators to enhance efficiency and reduce carbon dioxide emissions. A key component of this state-of-the-art power plant is the need for a chimney to manage emissions and mitigate the environmental impact.

Challenges

BEC encountered several challenges during the project, including:

Needing to accommodate two different types of flue liner materials and entry duct materials, each requiring distinct protection methods.
The requirement to apply artwork on the external windshield to enhance the visual appeal of the new structure, adding complexity to the construction process.
Limited site space, which posed additional logistical constraints and required careful planning to optimise resource utilisation.
Stringent local design requirements that demanded meticulous attention to detail and adherence to specific regulations.

BEC's Approach

Drawing upon our extensive experience in engineering and construction of vertical structures, Marubeni entrusted BEC with the design and build package for the new chimney. Adopting a tailored approach, we meticulously planned and executed various tasks to fulfil the project’s specifications. Our scope of work included constructing a 7.3m internal diameter flue, installing pile caps, implementing slipform construction techniques, and executing the heavy lifting of the roof and floors. Additionally, we erected external galleries and flues, installed flue internal linings and insulation, and applied artwork to the external windshield. Our responsibilities extended to installing internal rack and pinion hoists, aircraft warning lights (AWLs), internal lighting, lightning conductors, and earthing systems. Leveraging innovative solutions and optimised construction methodologies, BEC efficiently overcame challenges to deliver exceptional results.

The BEC Advantage

BEC’s meticulous planning and innovative solutions culminated in the successful completion of the chimney design and build package for EGAT’s Mae Moh Power Plant. The newly constructed chimney stands as a testament to BEC’s commitment to excellence and adaptability in challenging environments. By integrating advanced environmental control systems, including the FGD (flue gas desulfurisation), Low NOx Burner, ESP (electrostatic precipitator), and SCR (selective catalytic reduction), and adhering to stringent design requirements, the project not only enhances energy generation capacity but also underscores EGAT’s dedication to sustainability and environmental stewardship.