Innovative combined heat and power system based on a double shaft intercooled externally fired gas cycle

Iora, Paolo; Silva, Paolo

doi:10.1016/j.apenergy.2012.11.059

Cited by 31 publications

(9 citation statements)

References 34 publications

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“…Hybrid systems, consisting of a solid oxide fuel cell (SOFC) combined with a microturbine (mGT), are expected to have a significant role due to widespread distributed generation paradigm [1][2][3][4] and hydrogen economy [5][6][7]. More specifically, high performance aspects in small-size systems (ultra-high efficiency [8,9], ultra-low emissions [10], fuel flexibility [11,12] and co-generative applications [13,14]) of these innovative plants are essential in terms of environmental and energy demand [15,16].…”

Section: Introductionmentioning

confidence: 99%

Advanced control approach for hybrid systems based on solid oxide fuel cells

Ferrari

2015

Applied Energy

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This paper shows a new advanced control approach for operations in hybrid systems equipped with solid oxide fuel cell technology. This new tool, which combines feed-forward and standard proportional–integral techniques, controls the system during load changes avoiding failures and stress conditions detrimental to component life. This approach was selected to combine simplicity and good control performance. Moreover, the new approach presented in this paper eliminates the need for mass flow rate meters and other expensive probes, as usually required for a commercial plant. Compared to previous works, better performance is achieved in controlling fuel cell temperature (maximum gradient significantly lower than 3 K/min), reducing the pressure gap between cathode and anode sides (at least a 30% decrease during transient operations), and generating a higher safe margin (at least a 10% increase) for the Steam-to-Carbon Ratio.\ud This new control system was developed and optimized using a hybrid system transient model implemented, validated and tested within previous works. The plant, comprising the coupling of a tubular solid oxide fuel cell stack with a microturbine, is equipped with a bypass valve able to connect the compressor outlet with the turbine inlet duct for rotational speed control. Following model development and tuning activities, several operative conditions were considered to show the new control system increased performance compared to previous tools (the same hybrid system model was used with the new control approach). Special attention was devoted to electrical load steps and ramps considering significant changes in ambient conditions

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Section: Introductionmentioning

confidence: 99%

Advanced control approach for hybrid systems based on solid oxide fuel cells

Ferrari

2015

Applied Energy

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“…For smaller scale of 30 kW e , the study showed that the EFGT had a higher thermal efficiency compared to the DFGT mainly due to the additional power required in the latter for producer gas fuel compression [58]. For 50 kW e scale, another biomass fueled CHP-EFGT study showed an electrical efficiency of 21% [59]. For direct biomass burning, the use of fluidized bed combustor in a small scale 100 kW e CHP-EFGT was studied by Gaderer et al [60].…”

Section: Biomass Fuel With Efgtmentioning

confidence: 97%

“…A simulation study on turbocharger based CHP-EFGT was carried out using the Aspen Plus program on existing turbochargers performance maps [59]. Two turbochargers were operated separately as a low and high pressure MGTs with inter-cooling and re-heating between the compressor and turbine stages as shown in Fig.…”

Section: Turbocharger Based Efgtmentioning

confidence: 99%

Externally fired gas turbine technology: A review

2015

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“…CHP technology has benefitted some industrial sectors where room heating and power generations can be done simultaneously. Lora and Silva (2013) proposed an innovative CHP based on a double shaft intercooled gas cycle with an externally fired gas turbine cycle. The authors analyzed the performance of the system by using thermodynamic calculations.…”

Section: Mass Balancementioning

confidence: 99%

Modeling, identification, and control of coal-fired thermal power plants

Chandrasekharan

Panda

Swaminathan³

2014

Reviews in Chemical Engineering

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The major portion of total captive power comes from thermal power from coal, oil, natural gas, etc., of which coal-fired units contribute 41% of global electricity. The overall efficiency of such power plants is 33% due to variations in power plant design, use of wide fuel ranges, different steam turbines, and lack in modeling and control configurations. To improve this efficiency, knowledge on material and energy flows across subsystems, including fuel handling, boiler, turbine, and air management need to be known properly. In addition, there is a widespread lack in measurement and instrumentation systems in power plants across the fleet and operators. This scenario makes the operational adjustments more difficult. Again, the strictness in environmental compliances (sulfur and nitrogen components) is met at the cost of limiting thermal efficiency. Moreover, to comply with faster load change, less fuel consumption and more efficient supercritical boilers have been studied. Hence, to improve the efficiency level, more research starting from the state-ofthe-art review on modeling, identification, and control methods of coal-fired boilers and the integrated plant is aimed in this work. This will also address the issue of global climate change and reduction in emission of greenhouse gases.

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Innovative combined heat and power system based on a double shaft intercooled externally fired gas cycle

Cited by 31 publications

References 34 publications

Advanced control approach for hybrid systems based on solid oxide fuel cells

Advanced control approach for hybrid systems based on solid oxide fuel cells

Externally fired gas turbine technology: A review

Modeling, identification, and control of coal-fired thermal power plants

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