Power Savings in Simple and Combined Cycle Power Plants Using Closed-Loop, Evaporative Cooling Systems

2009 ◽  
Author(s):  
Rob Jenkinson
Keyword(s):  
Power Plants ◽  
Closed Loop ◽  
Evaporative Cooling ◽  
Cost Effective ◽  
Poor Quality ◽  
Combined Cycle ◽  
Energy Usage ◽  
Cooling Systems ◽  
Quality Water ◽  
Poor Quality Water

Closed-loop, evaporative cooling systems are a cost-effective heat transfer technology in simple and combined cycle power plants. Utilizing proven technology, a closed-loop, evaporative cooler provides lower outlet temperatures, uses less plot space, and offers the ability to use poor quality water along with requiring significantly lower parasitic energy usage.

Improving Plant Efficiency While Optimizing Water Use in Simple and Combined Cycle Power Plants

2008 ◽  
Author(s):  
Peter G. Demakos
Keyword(s):  
Power Plants ◽  
Closed Loop ◽  
Cost Effective ◽  
Poor Quality ◽  
Combined Cycle ◽  
Cooling Systems ◽  
Scarce Water ◽  
Quality Water ◽  
Poor Quality Water ◽  
Plant Efficiency

Closed-loop, evaporative cooling systems (Wet Surface Air Coolers) are a cost-effective heat transfer technology (for cooling and condensing) in simple and combined cycle power plants that also optimize use of scarce water resources. In addition to providing lower outlet temperatures and requiring less space and horsepower (HP), the WSAC can use poor quality water as spray makeup.

Inlet Air Cooling Methods for Gas Turbine Based Power Plants

2004 ◽  
Author(s):  
E. Kakaras ◽  
A. Doukelis ◽  
A. Prelipceanu ◽  
S. Karellas
Keyword(s):  
Gas Turbine ◽  
Power Output ◽  
Gas Turbines ◽  
Power Plants ◽  
Evaporative Cooling ◽  
Climatic Conditions ◽  
Combined Cycle ◽  
Air Cooling ◽  
Cooling Systems ◽  
Cooling Methods

Power generation from gas turbines is penalised by a substantial power output loss with increased ambient temperature. By cooling down the gas turbine intake air, the power output penalty can be mitigated. The purpose of this paper is to review the state of the art in applications for reducing the gas turbine intake air temperature and examine the merits from integration of the different air-cooling methods in gas turbine based power plants. Three different intake air-cooling methods (evaporative cooling, refrigeration cooling and evaporative cooling of pre-compressed air) have been applied in two combined cycle power plants and two gas turbine plants. The calculations were performed on a yearly basis of operation, taking into account the time-varying climatic conditions. The economics from integration of the different cooling systems were calculated and compared.

Inlet Air Cooling Applied to Combined Cycle Power Plants: Influence of Site Climate and Thermal Storage Systems

2008 ◽  
Vol 130 (2) ◽  
Author(s):  
Nicola Palestra ◽  
Giovanna Barigozzi ◽  
Antonio Perdichizzi
Keyword(s):  
Power Output ◽  
Parametric Analysis ◽  
Power Plants ◽  
Cooling System ◽  
Thermal Storage ◽  
Combined Cycle ◽  
Operating Conditions ◽  
Air Cooling ◽  
Ambient Conditions ◽  
Cooling Systems

The paper presents the results of an investigation on inlet air cooling systems based on cool thermal storage, applied to combined cycle power plants. Such systems provide a significant increase of electric energy production in the peak hours; the charge of the cool thermal storage is performed instead during the night time. The inlet air cooling system also allows the plant to reduce power output dependence on ambient conditions. A 127MW combined cycle power plant operating in the Italian scenario is the object of this investigation. Two different technologies for cool thermal storage have been considered: ice harvester and stratified chilled water. To evaluate the performance of the combined cycle under different operating conditions, inlet cooling systems have been simulated with an in-house developed computational code. An economical analysis has been then performed. Different plant location sites have been considered, with the purpose to weigh up the influence of climatic conditions. Finally, a parametric analysis has been carried out in order to investigate how a variation of the thermal storage size affects the combined cycle performances and the investment profitability. It was found that both cool thermal storage technologies considered perform similarly in terms of gross extra production of energy. Despite this, the ice harvester shows higher parasitic load due to chillers consumptions. Warmer climates of the plant site resulted in a greater increase in the amount of operational hours than power output augmentation; investment profitability is different as well. Results of parametric analysis showed how important the size of inlet cooling storage may be for economical results.

scholarly journals Rainwater Harvesting as a Drinking Water Option for Mexico City

2018 ◽  
Vol 10 (11) ◽  
pp. 3890 ◽  
Author(s):  
Mireya Gispert ◽  
María Hernández ◽  
Enrique Climent ◽  
María Flores
Keyword(s):  
Drinking Water ◽  
Mexico City ◽  
Rainwater Harvesting ◽  
Major Ions ◽  
Poor Quality ◽  
National Standards ◽  
Southern Mexico ◽  
Quality Water ◽  
Poor Quality Water ◽  
The University

Mexico City is one of the most water-stressed cities in the world; poor quality water occurs in several parts of the City. The use of rainwater harvesting (RWH) as a source of drinking water is gaining acceptance in several contexts, but the quality of the water obtained through these systems has not been sufficiently studied. This manuscript presents the results of water quality tests from samples taken in each component of an RWH system, installed by Isla Urbana at the National Autonomous University of Mexico (UNAM), southern Mexico City. The RWH system culminates with a drinking fountain which supplies water for the students, and other members of the university community. Samples were retrieved from August 2014 to November 2015, approximately once per month. Results showed that with an adequate operation of the RWH system the major ions, fluoride, zinc, arsenic, lead, iron, copper, chromium, aluminum, nitrate, and total coliforms comply with national standards and international guidelines for drinking water. Thus, RWH constitutes a viable option for providing good quality water in a megacity that will become increasingly water-stressed due to climate change.

Operation Diagnosis of a Combined Cycle Based on the Structural Theory of Thermoeconomics

1999 ◽  
Author(s):  
Luis Correas ◽  
Ángel Martínez ◽  
Antonio Valero
Keyword(s):  
Power Plants ◽  
Poor Quality ◽  
Structural Theory ◽  
Combined Cycle ◽  
Data Reconciliation ◽  
Data Sets ◽  
Component Level ◽  
Performance Diagnosis ◽  
Field Instrumentation ◽  
And Performance

Abstract Diagnosis of the performance of energy was theoretically developed based on the Structural Theory (Valero, Serra and Lozano, 1993), and traditionally Thermoeconomics have usually been applied to the design of power plants and comparison between alternatives. However, the application of thermoeconomic techniques to actual power plants has always to face the generally poor quality of measurement readings from the standard field instrumentation as an unavoidable first step. The proposed methodology focuses on measurement uncertainty estimation and performance calculation by means of data reconciliation techniques, in order to obtain the most confident plant balance upon the available instrumentation. The formulation of the Structural Theory has been applied to a combined cycle, where the Fuel-Product relationships at the component level must be optimally defined for a correct malfunction interpretation. This set of relationships determines the ability to diagnose and the level of the diagnostics obtained. The paper reports the application of the methodology to a 280 MW rated combined cycle, where performance diagnosis is illustrated with results from a collection of actual operation data sets. The results show that data reconciliation yields sufficient accuracy to conduct a thermoeconomic analysis, and how the estimated impact on fuel correlates with physical causes. Hence the feasibility of thermoeconomic analysis of plant operation is demonstrated.

scholarly journals Initial growth and tolerance of melon cultivars under salt stress

2016 ◽  
Vol 11 (2) ◽  
pp. 462
Author(s):  
Erbia Bressia Gonçalves Araujo ◽  
Francisco Vanies da Silva Sá ◽  
Fernanda Andrade de Oliveira ◽  
Lauter Silva Souto ◽  
Emanoela Pereira de Paiva ◽  
...  
Keyword(s):  
Saline Water ◽  
Block Design ◽  
Salt Content ◽  
Poor Quality ◽  
Tolerance Index ◽  
Initial Growth ◽  
Randomized Block Design ◽  
Initial Stage ◽  
Quality Water ◽  
Poor Quality Water

The melon crop is normally developed in semiarid regions, where water resources are limited. This scarcity of water is a strong stressor on the crops, and requires the supplementation of existing water supplies with poor quality water, especially saline water. This can impede the growth and production of plants; however, the use of tolerant genotypes may minimize this problem. Thus, a greenhouse experiment was developed at the Federal University of Campina Grande - UFCG, Pombal Campus, Paraiba State, Brazil, in order to study the emergence, initial growth, and tolerance of melon cultivars irrigated with waters of different salt content. We studied three melon cultivars (Gaúcho Redondo, Gaúcho Casca de Carvalho and Halles Best Jumbo) irrigated with five levels of saline water (0.6; 1.2; 1.8; 2.4; and 3.0 dS m-1), arranged in a 3 x 5 factorial scheme, with the treatments distributed in a randomized block design with four replications. The plants seeds were monitored for 30 days after sowing, and at 30 days the growth and salinity tolerance index was evaluated. Cultivar Halles Best Jumbo was the most tolerant to saline water during initial stage of growth, while the Gaucho Redondo was more sensitive to salinity. It was found that saline waters up to 1.8 dS m-1 were suitable for irrigation of melon plants round Gaucho and waters up to 2.4 dS m-1 could be used for irrigation of Gaucho Casca de Carvalho and Halles Best Jumbo crops during the initial growth phase.

Utilization of Municipal Solid Waste Compost in Reclamation of Saline-sodic Soil Irrigated with Poor Quality Water

2018 ◽  
Vol 66 (1) ◽  
pp. 28 ◽  
Author(s):  
Parul Sundha ◽  
Nirmalendu Basak ◽  
Arvind Kumar Rai ◽  
Rajender Kumar Yadav ◽  
Dinesh Kumar Sharma
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Poor Quality ◽  
Sodic Soil ◽  
Municipal Solid Waste Compost ◽  
Quality Water ◽  
Poor Quality Water
Sign in / Sign up

Export Citation Format

Share Document