Experimental data are presented on the transient behaviour of an industrial scale shelland- tube condenser condensing steam from steam-air mixtures under reduced pressure. Models are developed for the dynamic simulation of a shell-and-tube condenser and for condensation in a single vertical tube. The unsteady behaviour of the UMIST condenser was examined by measuring the response of the system to step changes in the five key operating conditions. These are the pressure, steam load, air load, cooling water flowrate and cooling water inlet temperature. Step increases and decreases in each of these quantities were imposed. The responses of the system pressures, temperatures and flowrates are presented. Conclusions as to the underlying phenomena occurring are put forward. A model of a shell-and-tube condenser was developed within the DIY A dynamic simulation package, Hall et al (1988). This was used to simulate both steady and unsteady experiments using the UMIST condenser. The model was able to predict closely steady-state temperature and pressure profiles. The overall pressure drops with single-phase flow were predicted to within +5% and those with condensation to within ±10%. The simulated responses of the system to the step changes in operating conditions matched closely those seen experimentally. A model of condensation in a single vertical tube was developed within the SPEEDUP dynamic simulation environment, Perkins and Sargent (1982). The system investigated is that of condensation of a single vapour from a non-condensing gas. The condensation process was predicted using the film theory approach. The model was used to simulate the steady-state experimental data of G.Lehr (1972). Good agreement between the experimental and predicted Experimental data are presented on the transient behaviour of an industrial scale shelland- tube condenser condensing steam from steam-air mixtures under reduced pressure. Models are developed for the dynamic simulation of a shell-and-tube condenser and for condensation in a single vertical tube. The unsteady behaviour of the UMIST condenser was examined by measuring the response of the system to step changes in the five key operating conditions. These are the pressure, steam load, air load, cooling water flowrate and cooling water inlet temperature. Step increases and decreases in each of these quantities were imposed. The responses of the system pressures, temperatures and flowrates are presented. Conclusions as to the underlying phenomena occurring are put forward. A model of a shell-and-tube condenser was developed within the DIY A dynamic simulation package, Hall et al (1988). This was used to simulate both steady and unsteady experiments using the UMIST condenser. The model was able to predict closely steady-state temperature and pressure profiles. The overall pressure drops with single-phase flow were predicted to within +5% and those with condensation to within ±10%. The simulated responses of the system to the step changes in operating conditions matched closely those seen experimentally. A model of condensation in a single vertical tube was developed within the SPEEDUP dynamic simulation environment, Perkins and Sargent (1982). The system investigated is that of condensation of a single vapour from a non-condensing gas. The condensation process was predicted using the film theory approach. The model was used to simulate the steady-state experimental data of G.Lehr (1972). Good agreement between the experimental and predicted
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:553038 |
| Date | January 1995 |
| Creators | Alcock, J. L. |
| Publisher | University of Manchester |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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