| Popis: |
Previous graphical methods for utility system targeting have been developed to address the targets achieved only when the steam is saturated. This work has developed new graphical methods to improve the accuracy of the targeting by including important practical considerations. Steam Composite Profiles are constructed firstly including boiler feedwater (BFW) preheating, steam generation at the saturation temperature, and steam superheating for steam generation. Site Source-Sink Profiles and Site Grand Composite Curves are plotted to target realistic boiler steam demand, the desuperheated steam for process heating, steam generation from the process heat recovery, and steam saving due to process indirect heat recovery through steam mains. These new energy targeting have been applied to overcome the shortcomings of previous methods ignoring the heat of BFW preheating and steam superheating in steam generation, and allows practical quantitative analysis combined with conceptual insights. |
