Before the widespread adoption of highefficiency dust filters, FGD plants and DeNOx plants, power stations depended on using very high chimneys to spread their emissions over a very large land area. In order to limit the cost of these high chimneys, most were built as multi flue chimneys, serving multiple power generating units. The internal flues would typically be constructed in acid resistant brick, fiber reinforced plastic or internally lined steel.
NEW CHIMNEY DESIGN (NCD) FOR FOSSIL-FUELED POWER STATIONS
The emissions from modern, state-of-the-art power stations are very low and consequently, dispersion of the flue gas stream over a large land area is no longer a concern. It follows that the required height of chimneys is usually smaller now. Chimneys currently being contracted are often 150 meters tall, or less.
ADVANTAGES OF NEW CHIMNEY DESIGN
For chimneys of less than 200 meters high, the use of Hadek's “New Chimney Design", a concrete chimney protected by Hadek's insulating borosilicate lining system, can be a significant money saver. The construction cost of NCD chimneys is 30% lower than that of chimneys with internal steel or FRP flues. In addition to the cost reduction, there is also a construction time reduction of approximately 5 months.
Even power station owners constructing chimneys for several units at the same time are fin-ding it more economical to build multiple NCD chimneys, usually one per unit, than to build a single chimney with multiple internal flues. Using one chimney per unit will also result in very short FGD outlet ducts.
For additional cost saving and emissions reduction, power plant owners should consider our other innovative ideas: