Heat recovery targeting assessment

A heat recovery targeting assessment starts with data collection for process streams based on existing process design and operation conditions. When extracting operating data, the questions are as follows What time periods of data should be extracted What feed rate and compositions should be used as the basis The idea is to select the operating conditions that reflect the most common operation in terms of feed rate and product yields. On this basis alone, the benefit calculation has meaningful representation. Therefore, two criteria could be satisfied for data extractions ... 

PROCESS HEAT RECOVERY TARGETING ASSESSMENT Recycle gas... 

The energy loss audit detected two major energy loss items Reaction effluent heat is rejected to the air cooler at 510 °F and stripper bottom product runs down in the water cooler at 470 °F, respectively. However, the energy loss audit could not determine the fuel-saving benefits of recovering these two heat losses and this question can only be answered by the heat recovery targeting assessment discussed later. 

Composite curves were developed for heat recovery targeting (Linnhoff et al., 1982). The word composite reveals the basic concept behind the composite curves method A system view of the overall heat recovery system. One hot composite stream represents all the hot process streams, while one cold composite stream represents all the cold process streams. In this manner, the problem of assessing a complex heat recovery system involving multiple hot and cold streams is simplified as a problem of two composite streams. In essence, the hot composite stream represents a single process heat source, while the cold composite stream represents a single process heat sink. 

Assessment methods (Chapters 5-7 for energy operation Chapters 9-10 for heat recovery system Chapters 12-14 for process operation and Chapters 16-19 for utility system operation) are then applied to identify root causes— potential causes include inefficient process operation, insufficient maintenance, inadequate or lack of operating practices, procedures and control, inefficient energy system design, and outdated technology. Assessment results are translated into specific corrective actions to achieve targets via either manual adjustments, the best practices, or by automatic control systems. Finally, the results are tracked to measure the improvements and benefits achieved. 

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