11-4477 Petrofac Webinar

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   Model Plate Fin Exchangers in Aspen HYSYS  ®   Simulations Featuring Petrofac Webinar Q&A This document summarizes the responses to questions posed before and during the webinar. Additional questions should be directed to  AspenTech Support .   Questions Submitted Prior to the Event: Q: Please show the fundamental equations used to compute the overall coefficient.   A:  The equations used by Aspen Plate Fin Exchanger are documented on the Aspen HTFS Research Network. You will need to subscribe in order to view our Design Handbook and Research Reports.  ____________________________________________________________________________________ Q: Can Aspen EDR be used with Aspen HYSYS Dynamics? A : Currently, Aspen EDR can only be used in steady-state simulation.  ____________________________________________________________________________________ Q: Is there anything about modeling core in kettle in this webinar? Can you model “core in kettle” type exchangers using Aspen EDR? A:   Yes, you can model core in kettle with Aspen Plate Fin Exchanger. Select plate-fin kettle as the Exchanger type in the Application Options, Figure 1. Then, specify the Kettle geometry on the plate-fin Kettles form, Figure 2.   Figure 1: Select plate-fin kettle   Figure 2: Specify the kettle geometry  ___________________________________________________________________________________  Q: Is it possible for Aspen EDR to calculate a plate-fin heat exchanger operating as a reflux condenser? A:  We do not currently have this capability in our plate-fin program. It is available in a Shell & Tube heat exchanger.  ____________________________________________________________________________________   Questions Submitted During the Webinar: Q: What is EDR? A: EDR is an acronym for Exchanger Design & Rating and is  AspenTech’s software family for designing Shell & Tube, Air Cooled, Plate, Plate Fin, and Fired Heater equipment.  ____________________________________________________________________________________    Q: Is Aspen EDR is separate tool or an Aspen HYSYS module? A:  Aspen EDR is a separate suite of products from Aspen HYSYS. Aspen EDR can be used as a stand-alone for heat exchanger fabricators, or it can be utilized in conjunction with Aspen HYSYS or Aspen Plus to simulate exchanger performance in the context of the flow sheet.  ____________________________________________________________________________________ Q: What is the difference between MUSE and EDR Plate Fin? Is one better to use in certain applications? A: Plate-fin was released in 2009 and was designed to replace MUSE. It has a more advanced integration structure to handle different geometries of plate-fin exchangers more readily than MUSE could. We also greatly improved the integration with Aspen HYSYS.  ____________________________________________________________________________________ Q: What versions of Aspen Plus and Aspen HYSYS can incorporate Aspen EDR designs? A: The integration has been possible for many years; however, V7.3 and higher shows that the integration is much easier to use. Notably, in V8.0 the full Aspen EDR console was accessible from the simulators for multiple types of heat exchangers.  Q: If we have an existing plate-fin exchanger configuration, can we change the rating method from end point or weighted to EDR Plate Fin and run the model as usual to achieve the same results as going into the Aspen EDR environment? A: No, changing the model type to Aspen EDR will not run the Aspen EDR sizing optimization automatically. Once you change the model type to EDR Plate Fin in Aspen HYSYS, you will need to import the Aspen EDR file to specify the rigorous design. Once the file has been imported into Aspen HYSYS, the Aspen EDR model will run in simulation mode in the flowsheet, which means that the design will be fixed but the process conditions will be set by the Aspen EDR model.  ____________________________________________________________________________________ Q: At the design stage of a new exchanger, we input the fouling factor. In debottlenecking, do we need to perform fouling factor adjustment to match actual exchanger performance, then perform the debottleneck? A: Typically, many clients would do this. In this case study, Petrofac tried to match the information from the client in the srcinal case and then use the same fouling factors.  ____________________________________________________________________________________ Q: Can you change Aspen EDR to select the smallest exchanger dimensionally or the lightest exchanger? A: Two different demonstrations were done during this webinar  — one on Rigorous Shell & Tube sizing from within Aspen HYSYS and the other for designing a plate-fin exchanger and importing the model into  Aspen HYSYS. The Shell & Tube design can be calculated to find the minimum area or the minimum cost (typically what customers use). The plate-fin exchanger is good for quickly and accurately finding the configuration of a multi-stream exchanger. This also designs on the basis of minimizing the area of the exchanger. The weights are calculated as a result of the design found.  ___________________________________________________________________________________   Q: Some plate-fin manufacturers have Fin Codes with geometric information of fin size, height, thickness, pitch, etc. Does Aspen HYSYS have a database with those Fins Codes? What about Aspen EDR? A:  Aspen EDR finds the best geometry of fins to meet the process requirements. It looks at fin height and fin frequency, as well as fin type and whether it’s  plain, perforated, or serrated fins — then finds the best optimum. Our correlations are generally accepted in the industry and our single-phase, boiling, and condensing coefficients for these fin types are widely accepted. You can introduce fabricators coefficients into the system if you’d like to use those correlations , but ours are typically used as the baseline.  ____________________________________________________________________________________    Q: How important was the hydraulic model for the design within Aspen EDR? A: The hydraulic model helped with the line drop, as well as the equipment drops.  ____________________________________________________________________________________ Q: Could you use a better solvent to reduce to the minimum of the Mercaptan in the sweetening unit and respect the sales gas spec? A: In this specific case, the licensor had to be contacted and the client was reluctant to make any changes to the licensor processes. Also, this was an existing plant; therefore to make changes or suggest new systems was very difficult. For additional information, please contact  AspenTech Support.   Q: How do you properly design the layer patterns for a plate-fin? Does Aspen EDR do it by itself? A: You can directly specify layer patterns in Aspen Plate Fin Exchanger and look at interlayer effects. Many of the leading fabricators use our tool that way . When you’re designing and simulating the exchanger, for most purposes, the stream simulation used is more than adequate. If you want to get into the details of the design and ensure that the design will not be subject to high thermal stresses for example, then you can impose the layer pattern — but this is not an output of the first-shot design. This tends to be a detail that a plate-fin exchanger fabricator will specify to minimize the risk of damaging thermal stresses. It will have some impact on overall thermal performance, but usually this isn’t  too significant.  ____________________________________________________________________________________ Q: Is AspenTech currently working with vendors to have some standard products available as selectable models, similar to what has been done with plate frame models within Aspen EDR? A:  Plate-fin exchangers are typically custom designed for each process application. Our design optimization suggests the appropriate geometry for each set of process conditions.  ____________________________________________________________________________________ Q: Which fouling factors are used for all 3 streams on PFHX? A: In this design example, we didn’t specify any fouling resistance. Typically , fouling resistances in Plate-fin heat exchangers are very low because they are made for clean stream applications. If you want to specify fouling resistances for each stream, you can enter values on the Process Data form in the program input as shown below in Figure 3.   Figure 3: Enter values on the Process Data form  

Anova Lecture

Jul 23, 2017
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