TECHNICAL CAPABILITIES FOR LOW-TEMPERATURE WASTE HEAT RECOVERY IN FOUNDRIES

摘要

Energy-intensive branches like the foundry industry generate a large amount of waste heat. The utilization of this kind of energy depends on different impact factors, such as temporal availability or temperature level. The latter is of particular importance for the present research project, which is supported by the European Union (European Social Fund) and the Saxonian Government since the low-temperature waste heat is a major research feature. In practice, the re-use of waste heat is already widespread in the higher temperature area (>500°C), while little attention is paid to the utilization of waste heat sources in the low-temperature area (80-250°C). Nevertheless, low-temperature waste heat contains a potential, which should be defined with the help of the linking by engineer-scientific, and economic-scientific methods closer (Fig. 1). Fig. 1 shows a bottom-up analysis of the calculated waste heat amount from exhaust streams of analyzed industrial plants. At each temperature the cumulative waste heat amount that appears above this temperature, is shown. The reference temperature amounts to 35°C, at which the waste heat potential comes to 127 PJ/a. The biggest potential of waste heat is up to a temperature of 200°C. For example, a city of approximately 800.000 habitants like Krakau, consumes about 6 PJ per year, assuming that 1 person consumes about 2000 kWh per year.