Methods to Reduce Hot Return Condensate Temperature Without Compromising Plant Efficiency for Combined Heat and Power Plants

2017 ◽  
Author(s):  
Anil Kumar Addanky
Keyword(s):  
Heat Transfer ◽  
Water Quality ◽  
Power Plant ◽  
Power Plants ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Combined Heat And Power ◽  
Higher Plant ◽  
Improve Water Quality ◽  
Plant Efficiency

This paper describes five methods to achieve effective heat transfer and higher plant efficiency when condensate return temperature is high and treatment is needed to improve water quality in the water treatment plant before sending it to the deaerator for a combined heat and power plant.

scholarly journals Comparative Modeling of a Parabolic Trough Collectors Solar Power Plant with MARS Models

Energies ◽  
2017 ◽  
Vol 11 (1) ◽  
pp. 37 ◽  
Author(s):  
Jose Rogada ◽  
Lourdes Barcia ◽  
Juan Martinez ◽  
Mario Menendez ◽  
Francisco de Cos Juez
Keyword(s):  
Heat Transfer ◽  
Water Vapor ◽  
Power Plant ◽  
Solar Radiation ◽  
Thermal Energy ◽  
Power Plants ◽  
Solar Power ◽  
Rankine Cycle ◽  
Heat Transfer Fluid ◽  
Solar Field

Power plants producing energy through solar fields use a heat transfer fluid that lends itself to be influenced and changed by different variables. In solar power plants, a heat transfer fluid (HTF) is used to transfer the thermal energy of solar radiation through parabolic collectors to a water vapor Rankine cycle. In this way, a turbine is driven that produces electricity when coupled to an electric generator. These plants have a heat transfer system that converts the solar radiation into heat through a HTF, and transfers that thermal energy to the water vapor heat exchangers. The best possible performance in the Rankine cycle, and therefore in the thermal plant, is obtained when the HTF reaches its maximum temperature when leaving the solar field (SF). In addition, it is necessary that the HTF does not exceed its own maximum operating temperature, above which it degrades. The optimum temperature of the HTF is difficult to obtain, since the working conditions of the plant can change abruptly from moment to moment. Guaranteeing that this HTF operates at its optimal temperature to produce electricity through a Rankine cycle is a priority. The oil flowing through the solar field has the disadvantage of having a thermal limit. Therefore, this research focuses on trying to make sure that this fluid comes out of the solar field with the highest possible temperature. Modeling using data mining is revealed as an important tool for forecasting the performance of this kind of power plant. The purpose of this document is to provide a model that can be used to optimize the temperature control of the fluid without interfering with the normal operation of the plant. The results obtained with this model should be necessarily contrasted with those obtained in a real plant. Initially, we compare the PID (proportional–integral–derivative) models used in previous studies for the optimization of this type of plant with modeling using the multivariate adaptive regression splines (MARS) model.

Erosion Resistance and Efficiency of Energy Exchangers

1982 ◽  
Author(s):  
W. J. Thayer ◽  
R. T. Taussig
Keyword(s):  
Power Plant ◽  
Fluidized Bed ◽  
Gas Turbines ◽  
Power Plants ◽  
Erosion Resistance ◽  
Operating Characteristics ◽  
Hot Gas ◽  
Point Increase ◽  
Effluent Stream ◽  
Plant Efficiency

Applications of energy exchangers, a type of gasdynamic wave machine, were evaluated in power plants fired by pressurized, fluidized bed combustors (PFBCs). Comparative analyses of overall power plant efficiency indicate that the use of energy exchangers as hot gas expanders may provide a 0.5 to 1.5 efficiency point increase relative to gas turbines. In addition, the unique operating characteristics of these machines are expected to reduce rotating component wear by a factor of 50 to 300 relative to conventional gas turbines operating in the particulate laden PFBC effluent stream.

Implementation of Life Cycle Assessment Method (LCA) and Analytical Hierarchy Process (AHP) to Determine the Development of Recycling Unit of Waste Water in Grati CCPP PT Indonesia Power up Perak Grati

2018 ◽  
Vol 874 ◽  
pp. 18-26
Author(s):  
Mila Tartiarini ◽  
Udisubakti Ciptomulyono
Keyword(s):  
Waste Water ◽  
Life Cycle Assessment ◽  
Life Cycle ◽  
Power Plant ◽  
Power Plants ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Service Water ◽  
The Impact

Waste water result from operating activities of Grati Combined Cycled Power Plant (CCPP) is significant amount and has potentially to be reutilized. A recycling unit as the pilot project has been applied in Grati CCPP PT Indonesia Power UP Perak Grati for capacity 4 tons/hour of service water product. Development plant of Grati CCPP up to year 2018 will produce more amounts of waste water, and potentially increase the pollution load in the unit area.Considering the use of alternative development for unit recycled waste water effluent from the Waste Water Treatment Plant (WWTP) has implications to the environmental and cost aspects, therefore a proper assessment to decide the alternative is needed. Proposed method of Life Cycle Assessment (LCA) is to measure the impact to the environment. And the Cost Benefit Analysis (CBA) is to measure the economic criteria. To integrate the results of the two methods, it is used and calculated by using Hierarcy Analytical Process (AHP).The result of the study about the environmental impact and economic analysis, the development of the recycling unit is required to process all waste water produced by power plants. Focus group by experts in power plant operation using AHP is based on the results of SimaPro 7.0 and CBA. The most beneficial result is with a single score of 0.2314 Pt / 1 ton of water service, the payback period of 2.5 years, 37.5% IRR and NPV US$ 88,577.23 and the MMF-RO unit for total capacity of 14 tons/hour has become the most alternative of development.

scholarly journals Evaluating the Impacts of Integrated Pollution on Water Quality of the Trans-Boundary Neris (Viliya) River

2018 ◽  
Vol 10 (11) ◽  
pp. 4239 ◽  
Author(s):  
Marina Valentukevičienė ◽  
Lina Bagdžiūnaitė-Litvinaitienė ◽  
Viktoras Chadyšas ◽  
Andrius Litvinaitis
Keyword(s):  
Water Quality ◽  
Water Treatment ◽  
Technological Development ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Suspended Solid ◽  
Storm Water ◽  
Boundary Area ◽  
Water Flows

The trans-boundary area between the Europe Union and other countries is highly susceptible to changes in water quality and variations in the potential pollution load that could influence its eco-systems significantly. The Neris (Viliya) River is one of the biggest surface water bodies in Lithuania and Belarus with an ecologically important area protected by international legislation. The study was aimed at evaluating the impacts of integrated pollution on water quality of the Neris River taking into account different storm-water flows and ecological scenarios. For this purpose, qualitative and quantitative statistical evaluation was set up and calculation was done; different integrated pollution loads of the catchment area were estimated. The evaluation considered a decrease in river discharge due to changes in the regional storm-water flow and technological development that should lead to the growing covered surface and a reduction in the untreated storm-water flows. The obtained results indicated that, in the case of storm-water treatment, the total nitrate and phosphate concentrations will decrease, while in the cases of changes in combined suspended solid, the concentration of nutrients will decrease. Thus, a trans-boundary storm-water treatment plant of the Viliya River is required as it should eliminate pollution accumulation and restore its acceptable environmental status. A coordinated international project for the entire catchment of the Neris (Viliya) River based on the specifications and requirements of the EU Water Framework Directive (EU 2000) should be developed and implemented. Subsequently, ecological river-use policies should be established at the international level, which should offer considerable perspectives for the sustainable development of the area.

scholarly journals Online flow cytometric monitoring of microbial water quality in a full-scale water treatment plant

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Benjamin Buysschaert ◽  
Lotte Vermijs ◽  
Agathi Naka ◽  
Nico Boon ◽  
Bart De Gusseme
Keyword(s):  
Water Quality ◽  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Full Scale ◽  
Microbial Water Quality ◽  
Flow Cytometric

Influence of a Variable in Time Heat Transfer Coefficient on Stresses in Model of Power Plant Components

2013 ◽  
Author(s):  
Jerzy Okrajni ◽  
Mariusz Twardawa
Keyword(s):  
Heat Transfer ◽  
Power Plant ◽  
Mechanical Behaviour ◽  
Power Plants ◽  
Thermal Loading ◽  
Computer Modelling ◽  
Temperature Fields ◽  
Fluid Medium ◽  
Stress Changes ◽  
Plant Components

The paper discusses the issue of modelling of strains and stresses resulting from heating and cooling processes of components in power plants. The main purpose of the work is to determine the mechanical behaviour of power plant components operating under mechanical and thermal loading. Finite element method (FEM) has been used to evaluate the temperature and stresses changes in components as a function of time. Temperature fields in the components of power plants are dependent, among parameters, on variable heat-transfer conditions between components and the fluid medium, which may change its condition, flowing inside them. For this reason, evaluation of the temperature field and the consequent stress fields requires the use of heat-transfer coefficients as time-dependent variables and techniques for determining appropriate values for these coefficients should be used. The methodology of combining computer modelling of the temperature fields with its measurements performed at selected points of the pipelines may be used in this case. The graphs of stress changes as a function of time have been determined for the chosen plant components. The influence of the heat transfer conditions on the temperature fields and mechanical behaviour of components have been discussed.

scholarly journals Industrial experiment on electrodialized separation of highly concentrated multicomponent technological solutions at thermal power plants

2019 ◽  
Vol 124 ◽  
pp. 01029
Author(s):  
A. A. Filimonova ◽  
N. D. Chichirova ◽  
A. A. Chichirov ◽  
A. I. Minibaev
Keyword(s):  
Water Treatment ◽  
Anion Exchange ◽  
Power Plants ◽  
Thermal Power ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Wash Water ◽  
Production Cycle ◽  
Thermal Power Plants ◽  
Alkaline Waste

The main sources of highly concentrated multicomponent technological solutions at thermal power plants (TPPs) are water treatment plants. Analysis of operation of the ion-exchange water treatment plant at the Nizhnekamsk Thermal Power Plant-1 showed that half of alkali supplied to regeneration of the anion-exchange alkali filters is not used, but is discharged for neutralization and then to wastewater. Due to the fact that the cost of alkali used in technological processes is quite high, it is economically feasible to process the alkaline waste with the alkali extraction and its reuse in the production cycle. The article presents the experimental results on the electro-membrane separation of alkaline waste regeneration solutions and wash water after anion-exchange filter regeneration. The revealed differences in the selectivity of various ion transfer through the electrodialysis apparatus membranes, depending on time and amount of transmitted electricity, allowed us to establish the possibility of obtaining an alkaline solution purified from impurities.

Assessing and maintaining membrane performance in a post-sedimentation ultrafiltration process

2012 ◽  
Vol 7 (2) ◽  
Author(s):  
Christopher C. Boyd ◽  
Steven J. Duranceau
Keyword(s):  
Water Quality ◽  
Citric Acid ◽  
Sodium Hydroxide ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Feed Water ◽  
Membrane Performance ◽  
Surface Water Treatment ◽  
Cleaning Agents ◽  
The Impact

A pilot test program was conducted to evaluate methods for maintaining the productivity of a hollow fiber ultrafiltration membrane operating at constant flux values of 49.2 and 62.3 gallons/ft2-day. The ultrafiltration pilot filtered settled water from a conventional surface water treatment plant in Florida. The testing assessed the impact of different chemical maintenance protocols on UF membrane performance. Seasonal variations in water quality necessitated changes in the type and combination of cleaning agents used to maintain membrane performance. Sodium hypochlorite, citric acid and sodium hydroxide were used during pilot testing as the fouling characteristics of the water changed with time. Pilot results were used to develop alternative chemically enhanced backwash strategies that varied with seasonally-impacted changes in feed water quality. Citric acid, with a target pH of <3, was found to be effective in August and September; whereas, a combination of citric acid and high pH sodium hydroxide chemically enhanced backwashes successfully maintained performance between November, 2010 and May, 2011.

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