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Dynamic Behavior of a Novel Distillation-evaporation-heat Pump Integrated System

Author: ZhouYuCheng
Tutor: WuJia
School: Zhejiang University
Course: Chemical Engineering
Keywords: Heat Pump Distillation Dynamic Simulation Controllability analysis Heat Integration Startup Procedure
CLC: TQ053.5
Type: Master's thesis
Year: 2010
Downloads: 74
Quote: 0
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Abstract


The distillation process is the energy in the chemical industry, one of the unit operations, it has an extremely important significance in the case of today's energy prices continue to rise, the reduction of the energy consumption of distillation operation. Heat integration and combination of distillation as a major energy-saving, and the development and application has also been widespread concern and a more in-depth research. This paper plant polysaccharides extract refined separation process, proposed a new type of DVH process. Through the the fractionator side of line the material and the combination of the steam jet pump, to complete the evaporation process, and recovering the steam latent heat, the three operating units of the distillation, evaporation and heat integration, not only saves an evaporator, equipment costs savings. DVH process and through the re-use of the latent heat of the product steam more than a 34% reduction in energy consumption than traditional processes. The same time, however, the new process increases the degree of coupling of the system, to bring a lot of problems in the production process control and system drive, in order to be able to achieve the industrial application of the new process, its detailed controllable analysis and dynamic behavior research is necessary. Launched the establishment of a strict mechanism model the dynamic behavior of the controllability analysis, selection and comparison of the dynamic response of the closed-loop control structure, the car program design and car process simulation and optimization research, the specific content includes: 1. steady-state simulation of commercial simulation software Aspen Plus rigorous nonlinear model DVH process, distillation column using Radfrac modules in the simulation, and the application of strict hydraulics calculation method. The heat exchanger are used independently the heat exchanger Heatx module. All unit operation modules calculate the required data are selected according to the actual factory equipment parameters. Aspen Dynamics Aspen Custom Modeler and Aspen Plus combined with the distributed parallel genetic algorithm to calculate the optimal operating parameters of the system in the stable production; 2. DVH process dynamic modeling and operating variables disturbances and feed disturbance and steam open-loop dynamic response of the relationship between the analysis, observation system variables, summarizes the dynamic characteristics of its open loop, and according to the characteristics of the process to establish a control structure of this paper; 3. relative gain matrix, NI number of quasi transfer matrix of different control structures and the number of MRI prospective comparative analysis and judgment of the controllability of the system, and thus choose the better the control structure to do further discussion; for the control structure of the concentration of the direct control of closed-loop dynamic response and predictive control status of the two scenarios and different mixed steam pressure disturbances in the operating variables and the feed and steam disturbance case analysis to select the best control scheme under different disturbance, and summarizes the various then the kinds of strengths and weaknesses of the control program; 5. Finally, this paper DVH process of decoupling, a unique car program, as the initial feed to the process of soft water, steam jet pump can provide a stable heat source extract as the feed. Obtained by dynamic simulation of driving the process, the trend over time and better operating parameters. Same time, the discharge time and the concentration of the material on the top and bottom were optimized, to avoid substandard products need to loop into the system, to ensure the stability of the system, and to achieve a zero loss and waste of raw material extract zero emissions.

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