Eng3190 Process Operation and Management - Full Investigation Report
Autor: Mikki • February 9, 2018 • 7,362 Words (30 Pages) • 587 Views
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List of Tables
Table
No.
Description
Page No.
1
Relative molecular mass values for all components in system
11
2
Feed and production rates in RV1
12
3
Stream D flow rates and composition
14
4
Stream R flow rates and composition
14
5
Stream B flow rates and composition
14
6
Specific heat capacity values for all components in RV1 mass balance
15
7
Enthalpies of each stream of mass balance of RV1
16
8
Heat of formation and heat of solution for relevant components in RV1
16
9
Log Data for Calculation
18
10
Conversion of the feed and product flow
18
11
Technical Data for Plate Heat Exchanger PHE1
19
12
Technical and Physical Data for Coil
23
13
Energy Balance for Day 2
A1
14
Summary of Heat Transfer Coefficient.
A2
15
The efficiency of the different flow rates that occur during day 3 between 13:11 and 14:11
A9
16
The efficiency of the different flow rates that occur during day 4 between 11:34 and 12:34
A10
17
The efficiency of the different flow rates that occur during day 4 between 10:34 and 11:34
A11
18
The efficiency of the different flow rates that occur during day 5 between 13:26 and 14:26
A12
19
The efficiency of the different flow rates that occurred from the data taken last year (2013)
A13
20
A comparison of the flow rate and efficiency between the old and new heat exchanger i.e. 2013 and 2014
A14
Introduction
In recent years, Plate heat exchangers (PHE) have been universally used in wide ranges of chemical processes as well as other industrial applications. There are many reasons to outline for the recent demands for PHEs. PHEs exhibit outstanding heat transfer characteristics, which permits a more simple design as opposed to the shell and tube heat exchangers. PHEs also have large surface areas in small volume, which allows them to be designed with respect to their different requirements by just changing the number of plate. (Haslego, 2002)
The aim of this project was to determine the heat transfer characteristics of the PHE1 and Reactor. In other to achieve the goal, the group were required to:
- Determine the overall energy balance for the reactor (RV1) and for PHE1.
- Determine all heat transfer coefficients (HTC) for RV1 and PHE1.
- Determine the relationship between HTC and the flow-rate through the heat exchanger (PHE1).
- Determine the efficiency of heat recovery between PHE1 and RV1.
- Interpret our results and make recommendations for further process development or process modifications.
Principles
The plate heat exchanger differs from the conventional shell and tube heat exchanger in that it contains a number of closely stacked plates, which allow the flow of hot and cold streams between alternate plates. This arrangement allows a high heat transfer area and perfect counter current flow, leading to very rapid heat exchange. Plate heat exchangers have a number of advantages over shell and tube heat exchangers such as the ease of maintenance; the flexibility of being able to add further plates; the lesser extent of fouling and the possibility of using lower approach temperatures. Plate heat exchangers tend to be used at lower temperatures and pressures (in an industrial sense) (Sinnott &Towler, 2009, pp 926-927).
The concept of an energy balance is based around the first law of thermodynamics, which explains the conservation of energy (Sinnott &Towler, 2009, pg 84):
Energy IN = Energy OUT + Energy GENERATED - Energy CONSUMED – Energy ACCUMULATED
In cases where chemical reaction does not take place (eg. Energy balance on PHE1) the above equation can be simplified to the following (Sinnott &Towler, 2009, pg 87):
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