Waste heat sources are available in almost all sections of integrated steel plant. This work is concentrated on the usage of this waste heat streams for different potential applications that could result in sustainable energy production along with reduction in CO2 emissions. All the waste heat streams identified in different sub process like coking, sintering, steelmaking, hot rolling and in hot strip mill for this work. The temperature of identified waste heat stream in the integrated steel plant ranges from the minimum value of 383 K (110°C) to a maximum value of 1973 K (1700°C). All the identified waste heat streams are explored for using in two heat recovery options namely vapor absorption (through vapor absorption machine) and organic rankine cycle (ORC).
Sources of waste heat sources of liquid streams can increase the energy reduction in a large amount as per observations through this work. Through the VAM case, specific CO2 emission reduction could be 13.7 kg CO2/tcs. Similarly, power generation through ORC route for the two case studies can result in the specific CO2 reduction of 6.6 kg CO2/tcs.