PDF Publication Title:
Text from PDF Page: 009
Figure 10: Brine mass flow rate for 1000 hours of operation of the ORC unit. Figure 11: Vaporizer pentane level for 1000 hours of operation of the ORC unit 2.8.1 The vaporizer pentane level The pentane level in the vaporizer plays a very significant role in the system dynamics. There is a feedback control mechanism to control the pentane level. An operator gives a set point (reference value) from the key board as judged appropriate depending on their experience. Once a set point is provided, it takes about 10-15 minutes for the controller to change the pentane level from its original to the new set point. After the controller takes over, the pentane level does not change significantly. The controller does not take into account the flow rate of the pentane outlet of the vaporizer directly but measures the pentane level. The pentane mass flow is a direct consequence of the of the heat transfer from the brine to the pentane in the vaporizer and the quantity of heat transfer is dependent mainly on the brine flow rate as the brine is fed at a constant temperature. The brine flow rate has changed significantly over time from the designed value or even from the state when the plant was first built. In case of abrupt change in the brine mass flow, the operators change the pentane level’s set point and there is also a control mechanism which bypasses the pentane vapour in case of a sudden increase in pentane vapour generation. A PID Simulink block has been used (P=0.8; I= 0.01; D= 0.01) as the controller. If the level control mechanism works properly, other than from the effect of sudden change in brine mass flow, the pentane level in the vaporizer can be assumed to have an insignificant effect. Figure 11 compares the actual pentane level, the pentane level with the feedback control having its level set point at 84% and the pentane level without feedback control. It can be seen from Figure 11 that, at about 75 hours of operation of the unit, the model with feedback control gives a better match with the actual value. However, over time, it changes and the model without the feedback controller gives a close match. By choosing an appropriate value of the set point of the pentane level, the feedback control will eventually give a better result than the model without feedback control. However, a feedback loop is associated with a long simulation time and clumsy calculations. As can be seen from the Figure, the difference in result between the model without feedback control and the actual is not very significant and it can be assumed that the control mechanism is in use and it makes the pentane level follow a set point. This will save a lot of calculations and consequently computation time at the expense of accuracy. Nonetheless, the model without feedback control produces reasonably accurate results. All the results of simulation presented in this section use no feedback control for the vaporizer pentane level. Sohel et al. 250 200 150 100 50 0 1 101 201 301 401 501 601 701 Time [h] 801 901 120 100 80 60 40 20 0 1 101 201 301 401 501 601 701 801 901 Time [h] 24 per. Mov. Avg. (Observed) 24 per. Mov. Avg. (Modelled with control arrangement) 24 per. Mov. Avg. (Modelled without control arrangement) 9 Vaporizer pentane level [%] Brine mss flow rate [kg/s]PDF Image | Dynamic Modelling and Simulation of an Organic Rankine Cycle Unit of a Geothermal Power Plant
PDF Search Title:
Dynamic Modelling and Simulation of an Organic Rankine Cycle Unit of a Geothermal Power PlantOriginal File Name Searched:
2609.pdfDIY PDF Search: Google It | Yahoo | Bing
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
Infinity Turbine ROT Radial Outflow Turbine 24 Design and Worldwide Rights: NFT for sale... NFT for the ROT 24 energy turbine. Be part of the future with this NFT. This design can be bought and sold but only one design NFT exists. You may manufacture the unit, or get the revenues from its sale from Infinity Turbine. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Supercritical CO2 10 Liter Extractor Design and Worldwide Rights: The Infinity Supercritical 10L CO2 extractor is for botanical oil extraction, which is rich in terpenes and can produce shelf ready full spectrum oil. With over 5 years of development, this industry leader mature extractor machine has been sold since 2015 and is part of many profitable businesses. The process can also be used for electrowinning, e-waste recycling, and lithium battery recycling, gold mining electronic wastes, precious metals. CO2 can also be used in a reverse fuel cell with nafion to make a gas-to-liquids fuel, such as methanol, ethanol and butanol or ethylene. Supercritical CO2 has also been used for treating nafion to make it more effective catalyst. This NFT is for the purchase of worldwide rights which includes the design. More Info
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
Infinity Turbine Products: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. May pay by Bitcoin or other Crypto. Products Page... More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)