Modelling and Validation of Evaporation Systems; Mass & Energy Balances
(2023) KETM05 20231Chemical Engineering (M.Sc.Eng.)
- Abstract
- To evaluate the performance of evaporation systems, performance parameters such as overall heat transfer coefficient and evaporation rate need to be evaluated. These parameters are difficult measure and therefore need to be calculated using other measured data. Alfa Laval Technologies AB have evaporation systems connected to the cloud that record measured data for evaluation. In this degree project 3 models for 3 different evaporation systems, a 1- effect system, a 2-effect system, and a 3-effect system, were developed in python. These models should be able to process the measured data and with it calculate and deliver information about system performance. The models were based on simple dynamic mass & energy balances for an evaporation... (More)
- To evaluate the performance of evaporation systems, performance parameters such as overall heat transfer coefficient and evaporation rate need to be evaluated. These parameters are difficult measure and therefore need to be calculated using other measured data. Alfa Laval Technologies AB have evaporation systems connected to the cloud that record measured data for evaluation. In this degree project 3 models for 3 different evaporation systems, a 1- effect system, a 2-effect system, and a 3-effect system, were developed in python. These models should be able to process the measured data and with it calculate and deliver information about system performance. The models were based on simple dynamic mass & energy balances for an evaporation system that were solved using the python function ”scipy.ompimize.minimize” in the python package ”scipy”. In the end the models all models fulfil the requirements however, the 1-effect system cannot collect data from the cloud and can only be run with a specific set of measured data points. All systems were validated by comparing model results to validated results, the 1-effect system using measured data and the 2- and 3-effect systems using an existing program for determining system performance. The validation showed that the 2-effect models results were very accurate. The model results for the 1- and 3-effect systems were less accurate but still okay. (Less)
- Popular Abstract
- Creating a model that continuously gives insight to evaporator performance.
Evaporation is method used in the industry to concentrate liquids. It is a energy intensive process and it is therefore important that it is run efficiently. Looking at performance parameters gives a good insight to evaporator efficiency. These parameters are not always easily measured and need to be calculated using other measured data. It is therefore useful to have a model that does this continuously and can handle a lot of data at once.
Evaporator systems can have very different designs. Generally, an evaporator consists of a heat exchanger where a liquid stream is evaporated by heat transfer from condensing steam, and a separation chamber where the... (More) - Creating a model that continuously gives insight to evaporator performance.
Evaporation is method used in the industry to concentrate liquids. It is a energy intensive process and it is therefore important that it is run efficiently. Looking at performance parameters gives a good insight to evaporator efficiency. These parameters are not always easily measured and need to be calculated using other measured data. It is therefore useful to have a model that does this continuously and can handle a lot of data at once.
Evaporator systems can have very different designs. Generally, an evaporator consists of a heat exchanger where a liquid stream is evaporated by heat transfer from condensing steam, and a separation chamber where the evaporated vapour is separated from the concentrated liquid. This is called a single-effect evaporator. If the evaporated vapour is used to heat another single-effect evaporator it is called a multi-effect evaporator. Multi-effect evaporators can consist of 2 or more effects in succession. In this degree project 3 models for 3 different evaporator systems were developed, tested, and validated. A model for a 1-effect system, one for a 2-effect system and one for a 3-effect system. The models were meant to calculate the performance parameters of overall heat transfer coefficient (OHTC), how well the heat in the heating media is transferred to the liquid feed stream, and evaporation rate, how much of the feed stream is turned into vapour. In the end two of the models could import over 48 hour’s of measured data from a cloud network, pre-process it by removing ”nan” values, filter that data and divide it into segments based on if the plant is in production or not. For the segments where production is happening the models could calculate the performance parameters and display them. The other model could import, pre-process and filter data from 3 different excel datasets and with these data calculate the performance parameters. When comparing the calculated data with validated data it was found that the model results for the 2-effect model were very accurate and the results for the 1- and 3-effect models were less accurate but still sufficient. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9125985
- author
- Sondell, Maja LU
- supervisor
- organization
- course
- KETM05 20231
- year
- 2023
- type
- H2 - Master's Degree (Two Years)
- subject
- keywords
- Evaporation, Evaporation Systems, Modeling, Python, Chemical Engineering, Kemiteknik, Evaporation Rate, Overall Heat Transfer Coefficient
- language
- English
- id
- 9125985
- date added to LUP
- 2023-06-22 10:47:50
- date last changed
- 2023-06-22 10:47:50
@misc{9125985,
abstract = {{To evaluate the performance of evaporation systems, performance parameters such as overall heat transfer coefficient and evaporation rate need to be evaluated. These parameters are difficult measure and therefore need to be calculated using other measured data. Alfa Laval Technologies AB have evaporation systems connected to the cloud that record measured data for evaluation. In this degree project 3 models for 3 different evaporation systems, a 1- effect system, a 2-effect system, and a 3-effect system, were developed in python. These models should be able to process the measured data and with it calculate and deliver information about system performance. The models were based on simple dynamic mass & energy balances for an evaporation system that were solved using the python function ”scipy.ompimize.minimize” in the python package ”scipy”. In the end the models all models fulfil the requirements however, the 1-effect system cannot collect data from the cloud and can only be run with a specific set of measured data points. All systems were validated by comparing model results to validated results, the 1-effect system using measured data and the 2- and 3-effect systems using an existing program for determining system performance. The validation showed that the 2-effect models results were very accurate. The model results for the 1- and 3-effect systems were less accurate but still okay.}},
author = {{Sondell, Maja}},
language = {{eng}},
note = {{Student Paper}},
title = {{Modelling and Validation of Evaporation Systems; Mass & Energy Balances}},
year = {{2023}},
}