Energy, exergy and economic analyses of a novel system to recover waste heat and water in steam power plants

Noroozian, Afsaneh; Mohammadi, Amin; Bidi, Mokhtar; Ahmadi, Mohammad Hossein

doi:10.1016/j.enconman.2017.04.067

Cited by 90 publications

(45 citation statements)

References 38 publications

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“…The first law of thermodynamics defines the energy analysis of any control volume or system [28,29]. In a steady state, while disregarding potential and kinetic energy, for a standard control volume can be defined mass and energy balance equations, according to [30,31]:…”

Section: Equations For the Calculation Of Energy Loss Through Gland Smentioning

confidence: 99%

Energy Loss Analysis at the Gland Seals of a Marine Turbo-Generator Steam Turbine

Kocijel

Poljak

Mrzljak

et al. 2020

Teh. glas. (Online)

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The paper presents an analysis of marine Turbo-Generator Steam Turbine (TGST) energy losses at turbine gland seals. The analyzed TGST is one of two identical Turbo-Generator Steam Turbines mounted in the steam propulsion plant of a commercial LNG carrier. Research is based on the TGST measurement data obtained during exploitation at three different loads. The turbine front gland seal is the most important element which defines TGST operating parameters, energy losses and energy efficiencies. The front gland seal should have as many chambers as possible in order to minimize the leaked steam mass flow rate, which will result in a turbine energy losses' decrease and in an increase in energy efficiency. The steam mass flow rate leakage through the TGST rear gland seal has a low or negligible influence on turbine operating parameters, energy losses and energy efficiencies. The highest turbine energy efficiencies are noted at a high load -on which TGST operation is preferable.

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Section: Equations For the Calculation Of Energy Loss Through Gland Smentioning

confidence: 99%

Energy Loss Analysis at the Gland Seals of a Marine Turbo-Generator Steam Turbine

Kocijel

Poljak

Mrzljak

et al. 2020

Teh. glas. (Online)

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“…In 1953, Rant put forward the concept of exergy, which is a physical quantity that synthesizes the first and the second law of thermodynamics to measure working ability. This concept can focus on the quality and quantity of energy [18][19][20], which provides a highly efficient method to evaluate the energy efficiency of the system [21][22][23]. Certain scholars have recently studied the energy system by means of the exergetic analysis.…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Optimal Operation for Steam Power Scheduling Based on Economic and Exergetic Analysis

et al. 2020

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Steam supply scheduling (SSS) plays an important role in providing uninterrupted reliable energy to meet the heat and electricity demand in both the industrial and residential sectors. However, the system complexity makes it challenging to operate efficiently. Besides, the operational objectives in terms of economic cost and thermodynamic efficiency are usually contradictory, making the online scheduling even more intractable. To this end, the thermodynamic efficiency is evaluated based on exergetic analysis in this paper, and an economic-exergetic optimal scheduling model is formulated into a mixed-integer linear programming (MILP) problem. Moreover, the ε-constraint method is used to obtain the Pareto front of the multi-objective optimization model, and fuzzy satisfying approach is introduced to decide the unique operation strategy of the SSS. In the single-period case results, compared with the optimal scheduling which only takes the economic index as the objective function, the operation cost of the multi-objective optimization is increased by 4.59%, and the exergy efficiency is increased by 9.3%. Compared with the optimal scheduling which only takes the exergetic index as the objective function, the operation cost of the multi-objective optimization is decreased by 19.83%, and the exergy efficiency is decreased by 2.39%. Furthermore, results of single-period and multi-period multi-objective optimal scheduling verify the effectiveness of the model and the solution proposed in this study.

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“…Therefore, research on power generation methods, performance optimization, overall efficiency, reduction in environmental pollutants, thermal and energy recovery, and the use of new energies in power plants has a special significance, as these are used in the formulation of policies, performance improvement, and increasing the productivity of existing sectors as well as designing new systems. Power plants are one of the major sources of energy production.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigations of a novel chimney system for power generation using the combination of fossil fuel power plant exhaust gases and ambient air

Shahdost

Astaraei

Ebrahimi‐Moghadam

et al. 2019

Energy Science & Engineering

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Fossil fuel power plants, one of the main sources of power generation, are the major emitters of exhaust gases into the environment at relatively high temperature and significant energy. One way to utilize these hot gases is to use wind turbines in the path of fluid flow that created by buoyancy (like a solar chimney). In this paper, the power generation from the gas of the power plant's chimney based on the buoyancy phenomenon using the combination of the power plant's hot output with ambient air is modeled and investigated at different discharge rates and temperatures of the power plant's hot output on a pilot scale. An experimental model, at the same scale of modeling, is constructed and used to validate the modeling results. The obtained results showed that due to the buoyancy phenomenon the combination of the power plant's exhaust gases with the ambient air creates a higher volume of the fluid with a good velocity inside the chimney compared with the exhaust gases of the power plant only. At the temperature of 350 K and velocity of 1 m/s for the hot inlet, the velocity of the fluid resulting from the buoyancy would be greater than 1 m/s for the air which enters the chimney's foot and its gas.

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Energy, exergy and economic analyses of a novel system to recover waste heat and water in steam power plants

Cited by 90 publications

References 38 publications

Energy Loss Analysis at the Gland Seals of a Marine Turbo-Generator Steam Turbine

Energy Loss Analysis at the Gland Seals of a Marine Turbo-Generator Steam Turbine

Multi-Objective Optimal Operation for Steam Power Scheduling Based on Economic and Exergetic Analysis

Experimental and numerical investigations of a novel chimney system for power generation using the combination of fossil fuel power plant exhaust gases and ambient air

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