Development of and experience with a new generation of modern coal firing systems in a new high-efficiency Combined Heat and Power Station

A new, highly advanced Combined Heat and Power Station which links a steam turbine with a coal-fired main boiler and a gas turbine waste heat system with a total electric output of 381 MW was commissioned in the summer of 1997. The main boiler is equipped with a new generation of pulverised coal firing systems. This new system combines ultra-low NOx vortex burners with a tangential firing concept. The firing system, including the new PF burners, has been developed and tested over the last 5 years including extensive computer modelling and tests on a pilot scale furnace. The new firing system unites the advantages of vortex burners and tangential firing systems. The LCS T-Firing system leads to very low NOx emissions with high burnout, good ignition in each individual burner, intensive mixing of the flue gas in the furnace, high corrosion protection, good slagging behaviour, low part-load operation even with coal only right down to 15 % MCR, coupled with high reliability. NOx emissions between 200 and 300 mg/m(3) STP referred to 6 % O-2 ( equal to between 0.150 and 0.230 Ib./MBTU) with unburned combustibles (UBC) in the fly ash of below 5 % have been achieved using a high volatile bituminouse German coal.