Development of a high-temperature air-blown gasification system

Pian, C. C. P.; Yoshikawa, Kunio

doi:10.1016/s0960-8524(01)00054-2

Cited by 35 publications

(17 citation statements)

References 5 publications

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“…This change in syn-gas composition affects the gas HHV and hence the gasifier CGE. Air preheating offers an alternative and more economical approach than oxygen blown systems [41]. The overall efficiency of the process on a thermal basis would be increased if the heat required for air preheating was recovered from the gas cooling section of the plant.…”

Section: Effect Of Air Preheatingmentioning

confidence: 99%

The effect of air preheating in a biomass CFB gasifier using ASPEN Plus simulation

Doherty¹,

Reynolds²,

Kennedy³

2009

Biomass and Bioenergy

256

113

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Section: Effect Of Air Preheatingmentioning

confidence: 99%

The effect of air preheating in a biomass CFB gasifier using ASPEN Plus simulation

Doherty¹,

Reynolds²,

Kennedy³

2009

Biomass and Bioenergy

256

113

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“…The use of high-temperature air in the MEET process increases the yield of the gasification process over those of conventional air-blown gasifiers [5]. This is because preheated air increases the heating rate of the incoming fuel and the volatile yield from the fuel particles is greatly enhanced under these hightemperature, rapid-heating conditions.…”

Section: Description Of Gasification Systemmentioning

confidence: 99%

“…These attributes include fuel flexibility, compact size, ability to operate on low-rank solid feedstock and transportability. The MEET gasifier technology and the current status of its development are described in Pian and Yoshikawa [5].…”

Section: Description Of Gasification Systemmentioning

confidence: 99%

“…Based on the HSM results one can conclude that the ash-rejection MEET gasifier should not encounter any ash fouling problems when operating at 900°C for any mixture ratios of willow and manure. The gasifier performances were estimated using a previously developed gasifier model [5]. The model assumes chemical equilibrium conditions and uses the minimization of Gibb's free energy method to determine the thermodynamic properties at the state points.…”

Section: Performance and Coe Estimates Of The Willow/manure Gasificatmentioning

confidence: 99%

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Biomass gasification for farm-based power generation applications

Pian¹,

Volk²,

Abrahamson³

et al. 2006

WIT Transactions on Ecology and the Environment, Vol 92

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Willow biomass crops have been shown to be a good fuel for farm-based power production using advanced gasification technology. The fuel gas can be used for generating electricity, using microturbines modified to operate on low-BTU gas, or for other farm energy needs. Willow biomass was found to make an excellent fuel for ash-rejection gasifiers with a predicted net gasification efficiency of about 85 percent. The main drivers to the cost-of-electricity were found to be associated with the harvesting, handling, and transporting of the willow biomass, accounting for 40 to 50 percent of the annual operating cost. In the present study, analysis showed that developing a method to co-gasify willow with various amounts of low-cost wastes, such as dairy farm animal waste, can be an excellent way to reduce the fuel cost, to increase the overall fuel availability and help work around problems resulting from seasonal availability of bioenergy crops. Co-gasification of dairy farm wastes along with willow offers an economical way to dispose of the wastes and manage nutrient flows on a dairy farm. The power generated from the animal waste can be used on the farm or sold to offset the cost of waste treatment.

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“…As mentioned by Sondreal et al [27] high temperatures are needed for most advanced combustion technologies, including those using co-firing biomass with fossil fuels, to improve the thermodynamic efficiencies, which in turn raises problems associated with high temperature such as corrosion and deposition by coal ash and slag. Slagging combustors have been used in more recent MHD applications [28] in conjunction with an advanced gasifier system, known as the Multistaged Enthalpy Extraction Technology (MEET) [29]. According to these researchers, improvements in coal gasification, cleanup, turbine generators, system integration, etc., improve efficiency in integrated gasification combined cycle (IGCC) plants.…”

Section: Introductionmentioning

confidence: 99%

Slag Behavior in Gasifiers. Part II: Constitutive Modeling of Slag

Massoudi

Wang

2013

Energies

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Abstract:The viscosity of slag and the thermal conductivity of ash deposits are among two of the most important constitutive parameters that need to be studied. The accurate formulation or representations of the (transport) properties of coal present a special challenge of modeling efforts in computational fluid dynamics applications. Studies have indicated that slag viscosity must be within a certain range of temperatures for tapping and the membrane wall to be accessible, for example, between 1,300 °C and 1,500 °C, the viscosity is approximately 25 Pa·s. As the operating temperature decreases, the slag cools and solid crystals begin to form. Since slag behaves as a non-linear fluid, we discuss the constitutive modeling of slag and the important parameters that must be studied. We propose a new constitutive model, where the stress tensor not only has a yield stress part, but it also has a viscous part with a shear rate dependency of the viscosity, along with temperature and concentration dependency, while allowing for the possibility of the normal stress effects. In Part I, we reviewed, identify and discuss the key coal ash properties and the operating conditions impacting slag behavior.

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Development of a high-temperature air-blown gasification system

Cited by 35 publications

References 5 publications

The effect of air preheating in a biomass CFB gasifier using ASPEN Plus simulation

The effect of air preheating in a biomass CFB gasifier using ASPEN Plus simulation

Biomass gasification for farm-based power generation applications

Slag Behavior in Gasifiers. Part II: Constitutive Modeling of Slag

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