South Africa‘s largest electricity producer ESKOM has set itself a significant task: to continuously monitor its dust concentration levels and, at the same time, meet the requirements stipulated by the country‘s environmental legislation. Providing the power plants with reliable mass emissions rates the transmittance dust measuring device DUSTHUNTER T200 and the gas flow measuring device FLOWSIC100H from SICK were selected.
ESKOM operates a number of large power plants that use fossil fuels, and has established links with coal mines in the area for this very reason. In fact, ESKOM is an electricity supplier to not only South Africa itself, but other Sub-Saharan nations too.
Not up for negotiation
Emission monitoring is not negotiable and also essential for process optimization. The emission measurements are governed by South Africa legislation, controlled and enforced by the governing body named the “Green Scorpions.” Should predefined limits be continuously exceeded and no corrective action taken by the power supplier, penalties will be charged. Should continuous breaches of these limits continue, the plant will be forced to shut down.
ESKOM will be on the safe side with his comprehensive monitoring and measuring technologies: they must be robust, accurate and highly reliable being online 24/7. Providing the power plants with reliable mass emissions rates the transmission monitor DUSTHUNTER T200 and the flow measuring device FLOWSIC100H were selected from the extensive SICK Process Automation portfolio.
Centered on dust monitoring
Transmission is a widely used optical technology that is ideal for monitoring from a small to a large active measuring path. The DUSTHUNTER T200 also automatically monitors the contamination and corrects the measuring value, providing adequate warning if contamination exceeds the tolerable level for the optical monitoring system. It is additionally equipped with an automatic self-adjustment, exclusive to SICK. It corrects shifts in the optical axis, which can occur in the case of thermal expansion of the stack. Both save unnecessary maintenance work. The automatic self-adjustment makes it extremely simple to start-up the device.
Measuring flow under any circumstances
Measuring gas flow in stacks of over three meters or more in diameter is practically impossible without ultrasound. Conventional measuring technology falls short when faced with low gas flow rates and gas flow turbulence or when particles in the gas contaminate the transducer. But FLOWSIC100 H makes short work regardless of unfavourabe flow conditions and impure gases. And thanks to different probe lengths, it can also be used for any wall thicknesses.
DeNox control with the SCR (selective catalytic reduction) Bypass System from SICK