Optimum Integration of a Bottoming Heat Recovery System in a Geothermal Power Plant Application

2012 ◽  
Author(s):  
Collins O. Ojo ◽  
Damien Pont ◽  
Andrea DeSimone ◽  
Donald Speirs
Keyword(s):  
Power Plant ◽  
Heat Recovery ◽  
Working Fluid ◽  
Interface Temperature ◽  
Geothermal Fluid ◽  
Working Fluids ◽  
Recovery System ◽  
Heat Recovery System ◽  
Geothermal Power ◽  
Topping Cycle

Geothermal power is becoming more and more significant in the renewable power mix of several countries in the world. The thermal conditions of the geothermal fluids exhausting from geothermal power plants shows additional potential for improved heat utilization through the integration of a low heat recovery system. This paper addresses the optimum integration of an Organic Rankine Cycle (ORC) as bottoming cycle with a geothermal steam power plant as topping cycle over a range of geothermal fluid interface temperatures. A reference geothermal based steam turbine power plant of 50MW capacity with indirect cycle configuration has been chosen for the study. At design point of the reference plant, optimized Organic Rankine Cycles based on three working fluids n-pentane, R123, and R245fa have been integrated at the exhaust of the geothermal fluid leaving the geothermal plant. An overall optimization of the power plant has been carried out by downsizing and over sizing the topping cycle with the integration of the bottoming cycle. One of the optimization variables for the overall plant is the interface temperature, which is a consequence of the resizing of the topping cycle. The procedure is repeated for the three different organic working fluids. By applying this procedure, it is then possible to know within a given interface temperature range, the organic working fluid that will give optimum plant performance. The choice of ORC integration option is not only driven by the best techno-economic solution but additionally by environmental, health and safety compliance.

On the suitable superstructure thermoeconomic optimization of a waste heat recovery system for a Brazilian diesel engine power plant

2021 ◽  
Vol 234 ◽  
pp. 113947
Author(s):  
Alexandre Persuhn Morawski ◽  
Leonardo Rodrigues de Araújo ◽  
Manuel Salazar Schiaffino ◽  
Renan Cristofori de Oliveira ◽  
André Chun ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Power Plant ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Waste Heat Recovery System ◽  
Recovery System ◽  
Heat Recovery System ◽  
Engine Power

scholarly journals Economic and Exergo-Advance Analysis of a Waste Heat Recovery System Based on Regenerative Organic Rankine Cycle under Organic Fluids with Low Global Warming Potential

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1317 ◽  
Author(s):  
Guillermo Valencia Ochoa ◽  
Cesar Isaza-Roldan ◽  
Jorge Duarte Forero
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Working Fluid ◽  
Exhaust Gases ◽  
Waste Heat Recovery System ◽  
Recovery System ◽  
Heat Recovery System

The waste heat recovery system (WHRS) is a good alternative to provide a solution to the waste energy emanated in the exhaust gases of the internal combustion engine (ICE). Therefore, it is useful to carry out research to improve the thermal efficiency of the ICE through a WHRS based on the organic Rankine cycle (ORC), since this type of system takes advantage of the heat of the exhaust gases to generate electrical energy. The organic working fluid selection was developed according to environmental criteria, operational parameters, thermodynamic conditions of the gas engine, and investment costs. An economic analysis is presented for the systems operating with three selected working fluids: toluene, acetone, and heptane, considering the main costs involved in the design and operation of the thermal system. Furthermore, an exergo-advanced study is presented on the WHRS based on ORC integrated to the ICE, which is a Jenbacher JMS 612 GS-N of 2 MW power fueled with natural gas. This advanced exergetic analysis allowed us to know the opportunities for improvement of the equipment and the increase in the thermodynamic performance of the ICE. The results show that when using acetone as the organic working fluid, there is a greater tendency of improvement of endogenous character in Pump 2 of around 80%. When using heptane it was manifested that for the turbine there are near to 77% opportunities for improvement, and the use of toluene in the turbine gave a rate of improvement of 70%. Finally, some case studies are presented to study the effect of condensation temperature, the pinch point temperature in the evaporator, and the pressure ratio on the direct, indirect, and fixed investment costs, where the higher investment costs were presented with the acetone, and lower costs when using the toluene as working fluid.

A Study on the Application of Abandoned Wind Electricity in Thermal Power Plant’s Heat Recovery System

2014 ◽  
Vol 1070-1072 ◽  
pp. 343-346
Author(s):  
Zeng Hong Xiao ◽  
Xing Lu Hua
Keyword(s):  
Power Plant ◽  
Heat Recovery ◽  
Thermal Power ◽  
Economic Benefits ◽  
Environmental Benefits ◽  
Heat Power ◽  
Wind Power Integration ◽  
Recovery System ◽  
Heat Recovery System ◽  
Electric Boiler

As wind power integration is scaled up year by year, the problem of abandoned wind electricity has become increasingly severe, and thus caused serious waste of energy. To solve the problem of abandoned wind electricity, this paper tries to heat power plant’s back water in electric boiler to absorb abandoned wind electricity. Taking a thermal power plant for example, the application of electric boiler in backwater system can bring great economic benefits and environmental benefits, and provide a reasonable way and solution for the use of abandoned wind electricity.

Development of a 125 kW AMB Expander/Generator for Waste Heat Recovery

2011 ◽  
Vol 133 (7) ◽  
Author(s):  
Lawrence A. Hawkins ◽  
Lei Zhu ◽  
Eric J. Blumber
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Magnetic Bearings ◽  
Working Fluid ◽  
Worst Case ◽  
Waste Heat Recovery System ◽  
Heat System ◽  
Recovery System ◽  
Heat Recovery System

The development and testing of an integrated power module (IPM) for a waste heat recovery system is described. The IPM is part of a waste heat recovery system based on the organic Rankine cycle. The waste heat system can recover energy from a wide variety of heat sources including landfill gas, reciprocating engine exhaust, solar, geothermal, boilers, and other industrial processes. The IPM incorporates a high performance, high speed permanent magnet generator with an integrated expansion turbine and low loss magnetic bearings. The IPM operates between 20,000 rpm and 26,500 rpm depending on the energy available from the heat source. The varying frequency voltage supplied by the generator is connected to the grid using an active/active power electronics package that can deliver power at 400–480 Vac (50 Hz or 60 Hz). Active magnetic bearings (AMBs) were chosen for the application because they can operate directly in the working fluid, have low losses, and provide high reliability and remote monitoring capabilities. This system has a flow-through design and an inboard impeller layout that produces desirable rotordynamics for a simple magnetic bearing control. An extensive shop testing procedure is described, and measurements and predictions are presented, showing good correlation. Shop testing of the IPM in the waste heat system has been completed for 15 systems. The magnetic bearings and backup bearings have performed as designed. The thrust balancing system has limited the thrust load that must be reacted by the axial magnetic bearings to 25% of the design load capacity in the worst case. The first field unit was installed in April 2009 at a biogas site.

scholarly journals Performance improvement of a 330MWe power plant by flue gas heat recovery system

2016 ◽  
Vol 20 (1) ◽  
pp. 303-314
Author(s):  
Changchun Xu ◽  
Min Xu ◽  
Ming Zhao ◽  
Junyu Liang ◽  
Juncong Sai ◽  
...  
Keyword(s):  
High Pressure ◽  
Power Plant ◽  
Flue Gas ◽  
Power Output ◽  
Heat Recovery ◽  
Waste Heat ◽  
Gas Temperature ◽  
Recovery System ◽  
Heat Recovery System ◽  
Plant Efficiency

In a utility boiler, the most heat loss is from the exhaust flue gas. In order to reduce the exhaust flue gas temperature and further boost the plant efficiency, an improved indirect flue gas heat recovery system and an additional economizer system are proposed. The waste heat of flue gas is used for high-pressure condensate regeneration heating. This reduces high pressure steam extraction from steam turbine and more power is generated. The waste heat recovery of flue gas decreases coal consumption. Other approaches for heat recovery of flue gas, direct utilization of flue gas energy and indirect flue gas heat recovery system, are also considered in this work. The proposed systems coupled with a reference 330MWe power plant are simulated using equivalent enthalpy drop method. The results show that the additional economizer scheme has the best performance. When the exhaust flue gas temperature decreases from 153? to 123?, power output increases by 6.37MWe and increment in plant efficiency is about 1.89%. For the improved indirect flue gas heat recovery system, power output increases by 5.68MWe and the increment in plant efficiency is 1.69%.

Sign in / Sign up

Export Citation Format

Share Document