Objetivo This project has several objectives:. replacement of oil-fired boiler plant by a fluidized coal fired bed boiler capable of meeting the total steam demand of the plant (5-15 T/h) under all load conditions, guaranteeing operational safety;. to demonstrate that the service life of main components meets guarantees;. to demonstrate that cost saving by charging with differing coal qualities is possible;. that guaranteed emission standards, in particular for SO2 and dust can be met.Annual oil saving is forecast at +- 2,700 TOE: the occuring ash is to be used in the manufacture of sand-lime brick.Due to late delivery of equipment, completion was delayed by two months. Coal conveyance and feeding were the source of problems and were only resolved by the use of high quality coal, which increased costs. The use of dry limestone resolved handling problems in this respect also. The premature wear on various components led also to higher costs since these had to be replaced.The fluidised bed met with requirements in relation to steam pressure, maximum capacity, minimum partial load and behaviour.However, performance was disappointing in some respects eg. its versatility in coping with differing coal qualities and in the quantities of limestone required.These accumulated difficulties meant that the boiler was operational for only 75% of the time at a little more than 50% of capacity: optimum performance should result in 2,200 to 3,000 tons of oil being substituted annually.The new plant includes an AFBC boiler with economiser, baghouse filter, flue-gas stack, feedwater treatment, coal and limestone storage bunkers and intermediate hoppers and transport and handling equipment for coal, limestone and solid residues.With respect to coal quality there are practically no limitations. Ash content can be as high as 20% and sulphur content up to 2% due to the possibility of capturing the sulphur-dioxide by means of limestone addition, resulting in 80% sulphur retention. On the other hand, the boiler is designed for a specific coal quality of 23,218 Kj/Kg, calorific value, an ash content of 12% and a water content of 8%.The boiler produces saturated steam at 18 Bar, which is used as the source of direct heat for the brick manufacturing process.The rated steam capacity is 10 t/h at full load with a consumption of some 1.2 t/h of steam coal (lower heating value 23 GJ/ton). Minimum load is achieved with a turndown ration of 1:4.The boiler consists of a water-cooled combustion chamber, with integrated fluidized bed, connected to a shell-and-tube type boiler. The fluidized bed is also cooled by means of water/steam tubes immersed within the bed.The boiler water flows from the shell boiler to the combustor section by natural circulation, which is maintained by the thermo syphon effect of the combustion chamber's water-cooled walls and immersed tubes.The temperature of the bed at full load is about 900 deg C.The expanded bed height is +- 800 mm.Particulates are separated from the flue gas in a highly efficient baghouse type separator, resulting in a particle emission meeting the Dutch requirement of only 20 g/GJ or 50 mg/Nm3.The AFBC boiler is intended to meet the plant's total steam requirements with a 4 year old shell boiler, fired with heavy fuel oil, and similar capacity, serving as standby. Programa(s) ENG-ENALT 1C - Programme (EEC) of financial support for projects to exploit alternative energy sources, 1979-1984 Tema(s) 1.6 - INDUSTRY Convocatoria de propuestas Data not available Régimen de financiación DEM - Demonstration contracts Coordinador SAND-LIME BRICK FACTORY Aportación de la UE Sin datos Dirección DE HAZELAAR 6104 RA KONINGSBOSCH Países Bajos Ver en el mapa Coste total Sin datos
