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HEAT INTEGRATION

HEAT INTEGRATION:. Department of Chemical Engineering University of Engineering And Technology, Lahore. HEAT INTEGRATION. HEAT EXCHANGER NETWORK DESIGN. A.N.Tabish 2009-MS-Chem-25. INTRODUCTION:. HEAT INTEGRATION.

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HEAT INTEGRATION

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  1. HEAT INTEGRATION: Department of Chemical Engineering University of Engineering And Technology, Lahore HEAT INTEGRATION HEAT EXCHANGER NETWORK DESIGN A.N.Tabish 2009-MS-Chem-25

  2. INTRODUCTION: HEAT INTEGRATION A cold process stream can be heated by using steam or any hot utility, available at a temperature higher than the target temperature of process stream and a hot process stream can be cold by using cooling water or any cold utility, available at a temperature lower than the target temperature of process stream. Situation refers the maximum use of utility that is merely an operating cost, and maximum annualized cost that demands a larger rate of return to make the process profitable. A cold process stream can be used to lower the temperature of hot process stream, which heats up the cold stream as well. Hence minimizing the use of utility and ultimately operating cost and total annualized cost. tabish288@yahoo.com

  3. “Heat Integration”, enables the maximum heat exchange between process streams using “Pinch Technology”, that revealed various methods to maximize process-to-process heat exchange and minimized the use of utilities through an integrated network of heat exchangers. Application of Pinch analysis minimizes the energy consumption of chemical processes by calculating thermodynamically feasible energy targets and achieving them by optimizing heat recovery systems, energy supply methods and process operating conditions. It is also known as process integration, heat integration, energy integration or pinch technology. tabish288@yahoo.com

  4. Improvement in the energy consumption obtained after successive designs of given product.

  5. PROFITABILITY OPTIMIZATION: Design for “Minimum Capital Cost” Design for “Minimum Energy Cost” Optimum Design for “Minimum Energy Cost”

  6. Simple process flow sheet Heat integrated flow sheet tabish288@yahoo.com

  7. PINCH TECHNOLOGY: Data Extraction:To formulate the process flow sheet and perform heat and mass balance. Minimum Approach Temperature:To select the minimum temperature difference that can be allowed across any heat exchanger in the network. Composite Curves:To draw the enthalpy vs. temperature graph for cold streams as well as for hot streams Minimum utility targets:To calculate the minimum heating and cooling requirements that must be supplied by utility system. Heat Exchanger Network (HEN) Design:To design a network of heat exchangers to exchange the energy between process and utility streams. Network Relaxation and Optimization:To modify the network to eliminate the small exchangers which are not cost effective. Process Change:To alter the process conditions of unit operations and other streams to maximize heat integration. tabish288@yahoo.com

  8. DATA EXTRACTION: Process Flowsheet Operating Conditions for process streams & unit operations Heat and mass balance Hot and cold stream allocation tabish288@yahoo.com

  9. MINIMUM APPROACH TEMPERATURE (ΔTmin):

  10. Area and cost variation with ΔTLM

  11. COMPOSITE CURVES: tabish288@yahoo.com

  12. The hot streams plotted separately The composite hot stream

  13. The cold streams plotted separately The composite cold stream

  14. MINIMUM UTILITY TARGET: For an efficient network synthesis it is required to evaluate MAXIMUM ENERGY RECOVERY (MER) so that MINIMUM UTILITY TARGET can be selected and network may be designed so as to satisfy the energy requirements for each process stream that is the determination of minimum hot and cold utility requirements in the process. Three methods are widely used for the estimation of minimum utility requirement. Graphical method Algebraic method Computer based methods tabish288@yahoo.com

  15. MINIMUM UTILITY TARGET: (Graphical Method) Production of Maleic Anhydride from Benzene

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