A new approach for simplifying the calculation of flue gas specific heat and specific exergy value depending on fuel composition

Coşkun, Can; Oktay, Zuhal; İlten, Nadir

doi:10.1016/j.energy.2009.07.040

Cited by 59 publications

(29 citation statements)

References 13 publications

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“…In industrial practice, the enthalpy graphic [11] and the enthalpy-temperature table [16] methods are widely used for the offline calculation of the specific enthalpy of the flue gas, which ignore the variant flue gas composition and are not suitable for online calculation. With respect to the density of the flue gas, the ideal gas equation of state is often utilized for engineering [10].…”

Section: Introductionmentioning

confidence: 99%

“…The mass flow rate and the thermodynamic properties of the flue gas are dependent on its temperature, pressure, and composition [8,9]. According to the combustion theory, the composition of the flue gas is calculable with the data of offline ultimate analysis of the coal under certain excess air ratio [10,11]. However, such calculation is relatively complex and a high accuracy of the coal sample assay is a prerequisite which can rarely be met in real power plants.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic properties calculation of the flue gas based on its composition estimation for coal-fired power plants

Yuan

2015

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties calculation of the flue gas based on its composition estimation for coal-fired power plants

Yuan

2015

Applied Thermal Engineering

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“…Nitrogen reacts with oxygen to form NOx at about 1200℃ and above [15]. In this study, the upper limit of flue gas temperature is assumed as 11 0℃.…”

Section: Calculation Of Combustion Air Amountmentioning

confidence: 99%

“…o, nitrogen is not considered to react with oxygen during the combustion reaction. It limits the intimacy between the fuel molecules and oxygen [15]. Table 2 shows the ultimate analysis of the combustible fraction of MSW.…”

Section: Calculation Of Combustion Air Amountmentioning

confidence: 99%

Thermal Analysis of a Small Scale Solid Waste-Fired Steam Boiler for Power Generation in Benin City, Nigeria

Akhator¹,

Obanor²,

Igbinomwanhia³

2016

Nig. J. Tech.

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Thermal analysis of a small scale solid waste-fired steam generator is presented in this paper. The analysis was based on the chosen design specifications which are operating steam pressure and temperature of 20bar and 400℃ respectively, solid waste consumption rate of 3.6ton/hr and a furnace utilizing grate-fired technology. The boiler is designed as a possible waste management option in Benin Metropolis and Nigeria at large with energy recovery. The average daily municipal solid waste (MSW) generation in Benin Metropolis was considered in order to assess the availability of the feed stock. A calorific value of 17.49MJ/kg was obtained for the solid waste using Dulong's formula. Calculations based on energy balance in the boiler show that about 7.63kg/s of air is required to combust 1kg/s of MSW to produce about 3.437kg/s of steam. Further calculations show that about 1.4MW of electrical power can be obtained from the produced steam.

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“…Secondly, the temperature of the flue gas entering the filters should be between 80 • C and 140 • C. In the remainder of this work, only the flue gases are considered for waste heat recovery due to the very low temperature of the cooling loops and due to the high availability of heat at the flue gas side. The flue gas in this work has been modeled as air considering the high amount of excess air after combustion [45]. Large amounts of air infiltrate trough gaps in the furnace and before the post-combustion chamber.…”

Section: The Case Studymentioning

confidence: 99%

Case Study of an Organic Rankine Cycle (ORC) for Waste Heat Recovery from an Electric Arc Furnace (EAF)

et al. 2017

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The organic Rankine cycle (ORC) is a mature technology for the conversion of waste heat to electricity. Although many energy intensive industries could benefit significantly from the integration of ORC technology, its current adoption rate is limited. One important reason for this arises from the difficulty of prospective investors and end-users to recognize and, ultimately, realise the potential energy savings from such deployment. In recent years, electric arc furnaces (EAF) have been identified as particularly interesting candidates for the implementation of waste heat recovery projects. Therefore, in this work, the integration of an ORC system into a 100 MWe EAF is investigated. The effect of evaluations based on averaged heat profiles, a steam buffer and optimized ORC architectures is investigated. The results show that it is crucial to take into account the heat profile variations for the typical batch process of an EAF. An optimized subcritical ORC system is found capable of generating a net electrical output of 752 kWe with a steam buffer working at 25 bar. If combined heating is considered, the ORC system can be optimized to generate 521 kWe of electricity, while also delivering 4.52 MW of heat. Finally, an increased power output (by 26% with combined heating, and by 39% without combined heating) can be achieved by using high temperature thermal oil for buffering instead of a steam loop; however, the use of thermal oil in these applications has been until now typically discouraged due to flammability concerns.

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A new approach for simplifying the calculation of flue gas specific heat and specific exergy value depending on fuel composition

Cited by 59 publications

References 13 publications

Thermodynamic properties calculation of the flue gas based on its composition estimation for coal-fired power plants

Thermodynamic properties calculation of the flue gas based on its composition estimation for coal-fired power plants

Thermal Analysis of a Small Scale Solid Waste-Fired Steam Boiler for Power Generation in Benin City, Nigeria

Case Study of an Organic Rankine Cycle (ORC) for Waste Heat Recovery from an Electric Arc Furnace (EAF)

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