Efficiency potential of indirectly heated solar reforming with open volumetric solar receiver

Storch, Henrik von; Stadler, Hannes; Roeb, Martin; Hoffschmidt, Bernhard

doi:10.1016/j.applthermaleng.2015.05.026

Cited by 18 publications

(7 citation statements)

References 23 publications

(25 reference statements)

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“…The numeric values for the requirements on the conversion of inlet species as well as the allowed deviation for M from 2 are debatable and based on experience and previous work on methanol production (cf. [10,22,23,26]). Slightly different values may be defined for other boundary conditions or based on overall process considerations.…”

Section: Procedures For Determining Suitable Mixed-reforming Conditionsmentioning

confidence: 99%

“…Therefore, in the present study, the utilization of carbon dioxide in a reforming process for generation of syngas for methanol synthesis and Fischer-Tropsch synthesis is thermodynamically assessed. The results will be put into context with solar heated reforming, for which experience from previous work is taken into account (e.g., [10,22,23]).…”

Section: Introductionmentioning

confidence: 99%

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(Solar) Mixed Reforming of Methane: Potential and Limits in Utilizing CO2 as Feedstock for Syngas Production—A Thermodynamic Analysis

2018

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The reforming of natural gas with steam and CO2 is commonly referred to as mixed reforming and considered a promising route to utilize CO2 in the production of synthetic fuels and base chemicals such as methanol. In the present study, the mixed reforming reaction is assessed regarding its potential to effectively utilize CO2 in such processes based on simple thermodynamic models. Requirements for the mixed reforming reactions based on process considerations are defined. These are the avoidance of carbon formation in the reactor, high conversion of the valuable inlet streams CH4 and CO2 as well as a suitable syngas composition for subsequent synthesis. The syngas composition is evaluated based on the module M = ( z H 2 − z CO 2 ) / ( z CO 2 + z CO ) , which should assume a value close to 2. A large number of different configurations regarding CO2/H2O/CH4 at the reactor inlet, operating pressure and outlet temperature are simulated and evaluated according to the defined requirements. The results show that the actual potential of the mixed reforming reaction to utilize CO2 as feedstock for fuels and methanol is limited to approximately 0.35 CO2/CH4, which is significantly lower than suggested in literature. At 900 °C and 7 bar at the reactor outlet, which is seen suitable for solar reforming, a ratio of H2O/CH4 of 1.4 can be set and the resulting value of M is 1.92 (CO2/CO/H2 = 0.07/0.4/1).

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Section: Procedures For Determining Suitable Mixed-reforming Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

(Solar) Mixed Reforming of Methane: Potential and Limits in Utilizing CO2 as Feedstock for Syngas Production—A Thermodynamic Analysis

2018

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“…The ARR is so far unknown on a large scale and under solar irradiation. Since it can be influenced by a multitude of measures as for volumetric absorber insulatioṅ example wind speed and direction, it is of vital importance to be able to measure it [15,14].…”

Section: Motivation and Backgroundmentioning

confidence: 99%

Air return ratio measurements at the solar tower Jülich using a tracer gas method

Tiddens

Röger²,

Stadler

et al. 2017

Solar Energy

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“…Fend et al (2013) simulated flow and temperature along the exact pore geometry using Monte Carlo ray tracing method for calculation of incoming radiation. Storch et al (2015) studied indirectly heated solar reforming with open solar receiver. They proposed to increase heating value of natural gas by concentrated solar radiation.…”

Section: Introductionmentioning

confidence: 99%

Conjugate simulation of solar honeycomb receiver for high temperature heat absorption at constant incident heat flux

Kawasaki

Nakakura

Matsubara

2020

JTST

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Conjugate simulation of solar honeycomb receiver for high temperature heat absorption at constant incident heat flux Abstract Conjugate radiation-convection-conduction simulation was conducted for a solar volumetric receiver of silicon carbide honeycomb for high temperature heat absorption at 1,000°C and higher. Simulation was made for three cases of channel cell size: 0.6mm; 1.5mm; 2.9mm. At two levels of incident heat flux 1,400 kW m −2 and 4,200 kW m −2 , air mass flux was changed variously for optimization of working conditions. When the cell size is reduced from d = 2.9 mm to 0.6 mm, the receiver efficiency together with the air temperature at the receiver exit increase at each level of incident heat flux. At 1,400 kW m −2 , the receiver efficiency exceeds 0.8 when the air temperature is as high as 1000°C in the case of the smallest cell size: d = 0.6 mm. At 4,200 kW m −2 , the efficiency surpasses 0.80 when the air temperature is almost 1500°C in the case of d = 0.6 mm. The heat losses from the receiver was analyzed through budget of energy balance equation. It was found that the thermal radiation was attenuated by reduction of channel cell size which resulted in enhancement of the receiver efficiency. The mean temperature at the top edge of the receiver decreased with the reduction of channel size in consistency with the attenuation of thermal radiation. The numerical result demonstrated that the reducing cell size is essential to absorb concentrated solar light at very high temperatures beyond 1000°C and higher.

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Efficiency potential of indirectly heated solar reforming with open volumetric solar receiver

Cited by 18 publications

References 23 publications

(Solar) Mixed Reforming of Methane: Potential and Limits in Utilizing CO2 as Feedstock for Syngas Production—A Thermodynamic Analysis

(Solar) Mixed Reforming of Methane: Potential and Limits in Utilizing CO2 as Feedstock for Syngas Production—A Thermodynamic Analysis

Air return ratio measurements at the solar tower Jülich using a tracer gas method

Conjugate simulation of solar honeycomb receiver for high temperature heat absorption at constant incident heat flux

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