Estimating Specific Chemical Exergy of Biomass from Basic Analysis Data

Song, Guohui; Shen, Laihong; Xiao, Jun

doi:10.1021/ie200534n

Cited by 119 publications

(42 citation statements)

References 18 publications

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“…The specific chemical exergy, ex ch depends on the chemical composition of a substance in its particular state, and if it is in equilibrium with the reference environment [28]. For solid fuels, the specific chemical exergy can be estimated based on the elemental compositions of the fuel [29][30][31][32][33][34][35][36][37].…”

Section: Exergy Analysismentioning

confidence: 99%

Exergy Analysis of Solid Fuel-Fired Heat and Power Plants: A Review

2017

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Abstract:The growing demand for energy is particularly important to engineers with respect to how the energy produced by heat and power plants can be used efficiently. Formerly, performance evaluation of thermal power plants was done through energy analysis. However, the energy method does not account for irreversibilities within the system. An effective method to measure and improve efficiency of thermal power plant is exergy analysis. Exergy analysis is used to evaluate the performance of a system and its main advantage is enhancement of the energy conversion process. It helps identify the main points of exergy destruction, the quantity and causes of this destruction, as well as show which areas in the system and components have potential for improvements. The current study is a comprehensive review of exergy analyses applied in the solid fuels heat and power sector, which includes coal, biomass and a combination of these feedstocks as fuels. The methods for the evaluation of the exergy efficiency and the exergy destruction are surveyed in each part of the plant. The current review is expected to advance understanding of exergy analysis and its usefulness in the energy and power sectors: it will assist in the performance assessment, analysis, optimization and cost effectiveness of the design of heat and power plant systems in these sectors.

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Section: Exergy Analysismentioning

confidence: 99%

Exergy Analysis of Solid Fuel-Fired Heat and Power Plants: A Review

2017

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“…According to the results suggested by Song et al [56], exergy flow related to the biomass used by the boiler is:…”

Section: Biomass Heatermentioning

confidence: 99%

Thermoeconomic Optimization of a Renewable Polygeneration System Serving a Small Isolated Community

et al. 2015

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During the last years, special attention has been paid to renewable polygeneration technologies, able of simultaneously producing thermal, cooling, electrical energy and desalinated water from seawater. This paper focuses on an innovative polygeneration system driven by renewable energy sources, including the following technologies: hybrid photovoltaic/thermal collectors, concentrating parabolic trough (CPVT), a biomass heater, a single-stage absorption chiller and a multiple-effect distillation desalination system. The system is designed to cover the base load of an isolated small community. In previous papers, the dynamic simulation model about plant operation is discussed. In this paper, a detailed exergy, economic and environmental analysis of the plant is presented. In addition, the plant was optimized using different objective functions, applying the Design of Experiment (DoE) methodology which evaluates the sensitivity of the different objective functions with respect to the selected design parameters. The results show that an increase of the storage volume is generally negative, whereas increasing the solar field area involves an increase of the exergy destruction rate, but also an improvement of the CPVT exergy output provided; the final result is an increase of both the exergy efficiency and the economic profitability of the polygeneration system. OPEN ACCESSEnergies 2015, 8 996

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“…The exergy received, Ex b , and delivered, Exu b , by the biomass boiler are determined from, (7) (8) where e CH is the chemical exergy of dry biomass; estimates for a variety of feedstocks are given in [31].…”

Section: 1mentioning

confidence: 99%

“…(29) where A r is the receiver's absorber area and C p is the specific heat capacity of the HTF. The useful heat gain, Q u , is determined from: (30) where, (31) and T in and T a are the receiver inlet temperature and ambient temperature. The fluid temperature rise, ∆T, for a given mass flow rate is calculated from: (32) The receiver sections which act as a pre-heater, evaporator and boiler have to be treated individually.…”

Section: 2mentioning

confidence: 99%

The feasibility of hybrid solar-biomass power plants in India

Nixon

Dey

Davies

2012

Energy

105

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We assess the feasibility of hybrid solar-biomass power plants for use in India in various applications including tri-generation, electricity generation and process heat. To cover this breadth of scenarios we analyse, with the help of simulation models, case studies with peak thermal capacities ranging from 2-10 MW. Evaluations are made against technical, financial and environmental criteria. Suitable solar multiples, based on the trade-offs among the various criteria, range from 1-2.5. Compared to conventional energy sources, levelised energy costs are high -but competitive in comparison to other renewables such as photovoltaic and wind. Long payback periods for hybrid plants mean that they cannot compete directly with biomass-only systems. However, a 1.2-3.2 times increase in feedstock price will result in hybrid systems becoming cost competitive. Furthermore, in comparison to biomass-only, hybrid operation saves up to 29% biomass and land with an 8.3-24.8 $/GJ/a and 1.8-5.2 ¢/kWh increase in cost per exergy loss and levelised energy cost. Hybrid plants will become an increasingly attractive option as the cost of solar thermal falls and feedstock, fossil fuel and land prices continue to rise. In the foreseeable future, solar will continue to rely on subsidies and it is recommended to subsidise preferentially tri-generation plants.Keywords: solar thermal; tri-generation; linear Fresnel reflector (LFR); energy policy; exergy. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 4 1. Introduction India receives a high level of Direct Normal Irradiance (DNI), 4-7 kWh/m 2 per day. Thus, there is a vast potential for decentralised solar energy applications using Concentrating Solar thermal Power (CSP). However, CSP technologies are currently expensive and the uptake in India has been slow. The Jawaharlal Nehru National Solar Mission was established in 2010 and outlined support for solar energy applications to encourage market penetration of gridconnected and decentralized off-grid applications, to provide energy services in India [1, 2]. One CSP technology of particular interest is the Linear Fresnel Reflector (LFR), due to its comparatively simple and inexpensive design. The LFR uses multiple rows of low profile mirrors to focus solar radiation onto a fixed target pipe to generate steam directly. Such Direct Steam Generation (DSG) is an alternative to the more commonly employed Heat Transfer Fluids (HTFs) -synthetic oil and molten salt -and has the potential to increase CSP plant efficiency and reduce costs [3]. However, thermal energy is difficult to store in DSG syste...

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Estimating Specific Chemical Exergy of Biomass from Basic Analysis Data

Cited by 119 publications

References 18 publications

Exergy Analysis of Solid Fuel-Fired Heat and Power Plants: A Review

Exergy Analysis of Solid Fuel-Fired Heat and Power Plants: A Review

Thermoeconomic Optimization of a Renewable Polygeneration System Serving a Small Isolated Community

The feasibility of hybrid solar-biomass power plants in India

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