Abstract
The paper presents an example of the thermal-flow analysis of a bottom ash cooler cooperating with a circulating fluidized bed (CFB) boiler. The authors present the methodology of the conducted studies and examples of thermal balance calculations basing on measurement results. The comparison of two different ash coolers indicates a significant relationship between the outlet temperatures of the ash and cooling water depending on the construction and arrangement of the analysed ash coolers. The analysis presented in this paper enables determining the optimal rotation speed of the screw in order to achieve the required temperature of the slag depending on the actual working parameters of the CFB boiler. It provides an opportunity to optimize the heat exchange conditions in order to obtain the highest acceptable water temperature at the outlet of the ash cooler while adhering to safety regulations. The hot water could further be used for internal sanitary purposes or to support heating systems operating in the power plant.
Highlights
Conventional and thermal power plants are the major producers of electricity and heat in the world power engineering sector
The deterioration of the overall efficiency of power units manifests in the increased consumption of fossils, which has a direct influence on the increase of the production of wastewater, waste heat, as well as greenhouse gases and other pollutants
Among the many types of bottom ash coolers utilized in power plants operating with a circulating fluidized bed (CFB) boiler, the solution based on two screws is very popular
Summary
Conventional and thermal power plants are the major producers of electricity and heat in the world power engineering sector Their period of operation, which is often calculated at 30–40+ years, has a significant impact on the natural environment, as well as on the health and functioning of local communities [1]. They have pointed out that heat loss minimization is the most important factor affecting the loss of power plant efficiency, and there are many areas of potential heat loss in a power plant These observations and comments have led to the Authors focusing their attention on an analysis of the thermal-flow processes taking place in ash coolers. Following a discussion of the study’s methodology, examples of thermal balance calculations basing on the measurement results are analysed This enables determining the optimal heat exchange conditions required to achieve the necessary temperature of the ash depending on the actual working parameters of the boiler
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