This comprehensive overview of waste heat recovery provides an in-depth look at the process, from the initial planning stages to the final cleanup. With this invaluable resource, you can learn how to safely and effectively recover waste heat from hazardous materials.
Fremont, CA: Waste heat recovery, or WHR, is crucial to improving energy efficiency in the chemical process industries (CPI). Many WHR techniques and technologies are currently being used in petrochemical, chemical, and petroleum refinery industries at varying phases. Rising energy costs and environmental concerns create a significant incentive to incorporate more innovative technology and approaches for WHR.
The majority of the research on this subject is focused on discrete strategies and tactics, but an integrated approach is required. This article's primary goal is to offer an overview of innovative techniques and technology for WHR (up to 400C) as a readily available resource for improved comprehension and early identification of appropriate WHR approaches. To do this, numerous WHR techniques from the literature and industry are gathered, and their advantages and disadvantages in implementation are examined. As a result, the study's scope includes suggestions for putting the chosen method or technology into practice and a thorough analysis of the many WHR approaches and technologies relevant to the CPI (particularly petroleum refineries).
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Background
Energy that is rejected by the environment is called waste heat. It results from thermodynamic constraints on processes and equipment, as well as from inefficient machinery and operations. A portion of waste heat is frequently capable of being put to good use. Waste heat accounts for 20–50 percent of the energy consumed in industry. Low-temperature heat, mostly released into the environment by cooling water, fin-fan coolers, and flue gases, accounts for a sizeable portion of this energy waste. Fin-fan coolers typically reject heat from distillation column overhead streams between 100 and 200 degrees Celsius, whereas streams below that temperature reject heat to the cooling water system.
Recovering part of the heat that would otherwise be wasted and transferring it to a process or equipment where it may be utilized as a practical, affordable, and eco-friendly energy-saving measure is known as waste heat recovery or WHR.
At the moment, significant expenditures are made on cooling towers, fin-fan coolers, and extremely tall stacks for flue gas disposal to release waste heat into the atmosphere. WHR offers the ability to save these expenses, lessen its downsides on the environment, and provide several additional advantages. The following elements are necessary for the development of an ideal WHR system:
● Quantity and temperature of waste heat
● Uses of recovered waste heat
● Cost of Energy
● Availability of space
● Minimum allowable temperature of waste heat fluid
● Minimum and maximum temperature of the process fluid
● Chemical compositions of waste heat process fluids
● Facility’s heat-to-power ratio
These are the essential elements for the development of an ideal WHR system.