Abstract
Coal calorific value is one of the main considerations for using coal as a power plant fuel. In addition, the requirements for indications of slagging and fouling are also important to maintain combustion efficiency. However, coal power plants often experience problems in boiler operations due to the use of certain types of coal, even though they have a relatively high calorific value. This research investigates the effect of coal blending on ash fouling and slagging in an experimental investigation using a drop tube furnace with or without additives. Five different types of coal from different locations have been used in this study. Pulverized low-rank coal samples are burned in a drop tube furnace at 1,175°C with probe temperatures of 550°C and 600°C, corresponding to the combustion chamber of 600 MW power plants, including superheater and reheater areas. The ash particles’ characteristics and material composition were also analyzed using scanning electron microscopy with energy-dispersive X-ray (SEM-EDX) and X-ray diffraction (XRD), respectively. All coal mixture combinations demonstrated potential as a fuel for power plants that use pulverized coal-fired boilers. Because of its capacity to reduce slagging and fouling potentials, combining coal blending with the use of chemical additives yielded the greatest results.
Highlights
Most of the power plants in Indonesia use fossil fuels, with coal as the largest contributor of about 60% [1]
For every 100 tons of coal, about 6 kg additives are added or 0.006%. e coal material was prepared by crushing, which resulted in pulverized coal with 70% passing 200 mesh (75 microns) size of each coal. e pulverized fuel was analyzed and blended according to the provisions, including additives (MgO). e following table shows the characteristic of each coal, including the mixed coal: is study uses the main equipment, DTF, a furnace with a ceramic tube length of 1,200 mm, and an inner diameter of 72 mm, as shown in Figure 1. e cofiring process is conducted in a downward direction inside the tubular furnace
The ashes are cooled down and collected using sheets of paper developed by the authors. en, their compositions are analyzed using scanning electron microscopy with energy-dispersive X-ray (SEM-EDX) and X-ray diffraction (XRD). e furnace operates at a combustion chamber temperature of 1,175°C with an excess of 5% O2, probe temperatures of 550°C and 600°C
Summary
Most of the power plants in Indonesia use fossil fuels, with coal as the largest contributor of about 60% [1]. The coal combustion analysis tool can indicate the slagging and fouling effects of coal burned inside the boiler. Coal power plants often experience problems in boiler operations due to the use of certain types of coal, even though they have a relatively high calorific value [2]. E results indicated that burning coals with medium slagging tendencies in an existing boiler could cause more issues in future boilers Adding additives is another method to overcome slagging and fouling problems. Widely studied, almost no study deals with the effect of chemical additives during mixed fuel combustion on slagging and fouling behavior. Is research is aimed to investigate the effect of coal blending on ash fouling and slagging in a pilot experiment using a drop tube furnace with or without additives. E ash particles’ characteristics and material composition were analyzed using scanning electron microscopy with energy-dispersive X-ray (SEM-EDX) and X-ray diffraction (XRD), respectively
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