Modelling of superheated steam drying for combined heat and power at a corn ethanol plant using Aspen Plus software

Morey, R. Vance; Zheng, Huixiao; Kaliyan, Nalladurai; Pham, Matthew V.

doi:10.1016/j.biosystemseng.2014.02.001

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…Power engineering has also utilized SSD models, e.g. for combined heat and power operating on corn ethanol (Morey et al, 2014) and self-heat recuperative fluidized bed dryer of biomass, which allowed for 95% reduction in energy consumption compared to conventional systems (Liu et al, 2015). Coal, as a granular object, was also examined in terms of superheated steam drying (Chen et al, 2000).…”

Section: Experimental Methods 21 Sample Preparationmentioning

confidence: 99%

Comprehensive study on the kinetics and modelling of superheated steam drying of Belchatow lignite from Poland

Zakrzewski

Komatsu

Ściążko

et al. 2016

Mechanical Engineering Journal

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In the modern fuel mix, the leading positions are occupied by hard coal and crude oil, both accounting for around 35% of annual mined energy content (Andruleit et al., 2012). With a 2% share, lignite does not compete with the former two in the global perspective. However, easy accessibility and low production costs ensure its important role in the energy policies of particular countries worldwide. Utilization of this energy carrier is limited, though, due to the water content often exceeding 50% of raw mass. High moisture content negatively affects calorific value and precludes transportation and storage. So, lignite is less advantageous than hard coal in terms of utilization in the power generation industry. On the other hand, the usage of lignite is also considered for a wide range of applications, including coking or briquetting, and considerable volatile matter content makes it a prospective fuel for gasification purposes. Thus, the efforts made to upgrade its quality seem justified.The removal of water, contributing to increase in thermal efficiency of lignite-fired power plants, can be performed by a variety of methods, separated into evaporative thermal drying, non-evaporative thermal drying and other Marcin ZAKRZEWSKI* , **, Yosuke KOMATSU***, Anna SCIAZKO*, Taro AKIYAMA***, Akira HASHIMOTO***, Naoki SHIKAZONO***, Shozo KANEKO***, Shinji KIMIJIMA** , ***, Janusz S. SZMYD* and Yoshinori KOBAYASHI*** AbstractLow calorific value of lignite, mostly attributed to high moisture content, undermines usability of this low rank coal. Upgrading the quality of this energy carrier, which benefits coal-fired power plant's thermal efficiency, can be effectively realized by means of drying. The kinetics of superheated steam drying was studied for 30 mm spherical samples from Belchatow lignite mine in Poland. The experiment featured simultaneous and continuous measurements of weight and temperature. The drying kinetics, described by curves of moisture content, drying rate and temperature profile, were evaluated using the data acquired. The appearance of the sample throughout the process was video-recorded. Widespread cracking and shrinkage, which differ depending on the conditions, along with series of droplets typical for larger sample, were observed. The examined particles were suitable for predictions of thermodynamically derived drying rate and time, as proposed in the previous study for 5 and 10 mm particles from the same coal deposit. However, in comparison they exhibited more uniform density distribution. On the basis of experimental results and material properties, the numerical model of drying process was applied. Simulated drying behavior was consistent with empirical observations. Extensive investigation, revealing features of variously-sized samples as well as diameter dependence on drying process, is required for purposes of designing industrial drying system dedicated to specific type of coal.

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Section: Experimental Methods 21 Sample Preparationmentioning

confidence: 99%

Comprehensive study on the kinetics and modelling of superheated steam drying of Belchatow lignite from Poland

Zakrzewski

Komatsu

Ściążko

et al. 2016

Mechanical Engineering Journal

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“…The configuration of the CCPP system was an ethanol-driven gas turbine cycle (GTC), using exhaust heat recovery to drive a bottoming steam cycle (STC), with steam extraction for DH. Ethanol-based CCPPs are well known, and different authors have performed studies on such systems [45][46][47]. The schematic layout of the system is presented in Fig.…”

Section: Case Studymentioning

confidence: 99%

Implementation of CCPP for energy supply of future building stock

Tereshchenko

Nord

2015

Applied Energy

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and Process Engineering, Kolbjørn Hejes vei 1d, NO-7491 Trondheim, Norway h i g h l i g h t sSensitivity analysis was performed under changeable heat demand profiles. Results found high dependency of plant performance from heat load in DH system. CCPP as the most energy efficient conversion plant is suitable for heat supply of high heat density areas. CCPP operate with difficulties in energy supply of low heat density areas. The power production in CCPP is not influenced by the supply temperature control. a b s t r a c tEuropean Directive 2010/31/EU stated that by the end of 2020 all new buildings should be nearly Zero-Energy Buildings (nZEB). Since such buildings require a low quantity of energy for heating, they can utilize energy from the return line of a District Heating (DH) system. Further, this new type of buildings can successfully be integrated into the fourth generation of heat distribution technology, which is the new trend in the DH industry. On the other hand, existing building stock has a service lifetime of around 50 years, indicating that the required supply temperature in the DH system cannot be lowered beneath a certain level. Hereafter, together with new types of buildings and different policies, this could lead to changes in heat demand profiles of the DH system.The above-mentioned situation in the building market will lead to changes in heat load profiles and unavoidably influence the performance indicators of energy conversion units. Therefore, the focus in this paper was devoted to operation analysis of ethanol-based a Combined Heat and Power (CHP) plant with combined cycle technology under changeable demand conditions and different temperature levels in the DH system.In this paper different temperature levels of the DH system together with two temperature control strategies were considered. Further, the analysis included different heat demand profiles. The analysis was performed in Aspen HYSYS simulation software and data post processing was made by MATLAB. The results found that effective plant operation is highly dependent on heat load profile. Temperature control strategies did not induce a significant change in overall power production in CHP. The decrease in the supply temperature did not show a significant impact on plant performance. However, increase in temperature difference between supply and return lines led to higher power production and better overall plant performance. Further, it was concluded that it is rather difficult to operate CCPP connected to low energy building stock. This means that the CCPP is suitable for high-density heat areas, while it has poor energy performance indicators in low heat density areas.

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“…In order to validate this program, a calculation results comparison between it and the ASPEN PLUS (Advanced System for Process Engineering Plus Software, which is well received for cycle modelling and thermodynamical analysis [43][44][45]) was made. The initial calculation conditions for the Rankine cycle are shown in Table 2.…”

Section: Validationmentioning

confidence: 99%

Energy, exergy analysis and working fluid selection of a Rankine cycle for subsea power system

Yuan

Mei

2015

Energy Conversion and Management

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Modelling of superheated steam drying for combined heat and power at a corn ethanol plant using Aspen Plus software

Cited by 9 publications

References 12 publications

Comprehensive study on the kinetics and modelling of superheated steam drying of Belchatow lignite from Poland

Comprehensive study on the kinetics and modelling of superheated steam drying of Belchatow lignite from Poland

Implementation of CCPP for energy supply of future building stock

Energy, exergy analysis and working fluid selection of a Rankine cycle for subsea power system

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