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- He, Qiao, et al.
(författare)
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A study on latent heat storage exchangers with the high-temperature phase-change material
- 2001
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Ingår i: International Journal of Energy Research. - : Hindawi Limited. - 0363-907X .- 1099-114X. ; 25:4, s. 331-341
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a theoretical analysis and an experimental test on a shell-and-tube latent heat storage exchanger. The heat exchanger is used to recover high temperature waste heat from industrial furnaces and off-peak electricity. It can also be integrated into a renewable energy system as an energy storage component. A mathematical model describing the unsteady freezing problem coupled with forced convection is solved numerically to predict the performance of the heat exchanger. It provides a basis for optimum design of the heat exchanger. The experimental study on the heat exchanger is carried out under various operating conditions. Effects of various parameters, such as the inlet temperature, the mass flow rate, the thickness of the phase change material and the length of the pipes, on the heat transfer performance of the unit are discussed by combining with theoretical prediction. Criterion for analyzing and evaluating the performance of heat exchanger is also proposed.
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| 5. |
- Yu, C., et al.
(författare)
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PROCESS MODELING OF A CELLULOSE PARTICLE DURING PYROLYSIS
- 2000
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Ingår i: 1st World Conference on Biomass for Energy and Industry. - 1902916158 ; , s. 1848-1851
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- To study biomass pyrolysis process, a mathematic model is developed in this work focusing on the cellulose constituent. A single cellulose particle is supposed to experience pyrolysis once exposed to an environment of 800 C°. The model involves the pyrolytic kinetic scheme and the detailed heat and mass transfers caused by radiation, conduction, diffusion and convection with respect to the solid, liquid and gas products from pyrolysis. Based on the model computation results, the heat and mass transfer limits to the pyrolysis are discussed. The central role of the pyrolytic reaction heat versus a slow heat supply through the particle is identified. Various predictions by the model provide a good understanding of the complex process of biomass pyrolysis, which can be useful for applications of thermochemical conversions of biomass.
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| 6. |
- Zhang, Wennan, et al.
(författare)
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A PRELIMINARY TEST ON AN INDUSTRIAL BIOMASS CFB GASIFIER
- 2002
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Ingår i: 12th European Biomass Conference. - 889004425X ; , s. 745-748
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A test was carried out on an 6 MW industrial biomass atmospheric CFB gasifier in a power plant. The gas composition, NH3 and tar contents in the product gas at different temperatures were measured and analyzed. Ash (char in the present case) analysis was also made to make mass balance of chemical element in solid and gas phases during gasification based on Si balance analysis. The measurement results show that a gas productivity of 2 Nm3/kg (daf biomass) with gas LHV of 5MJ/Nm3 can be achieved at 750℃.The conversion of fuel-bound nitrogen (FBN) to NH3 ranges from 6 wt% to 70 wt% depending on temperature. Tar content in the product gas ranges from 2.5 to 16.7 g/m3. Small fractions of H, O, N, Cl and S contents in fuel remain in the ash while most of mineral metal element remains in the ash.
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| 7. |
- Zhang, Wennan, et al.
(författare)
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Further test on the Sanya 6MW biomass CFB gasifier
- 2004
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Ingår i: 2nd World Conference and Exhibition on Biomass for Energy, Industry and Climate Protection. Rome, Italy, 10 - 14 May 2004.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Following a preliminary test on the 6 MW Sanya biomass CFB gasifier (reported in the last conference at Amsterdam), a further test has been carried out focusing on the use of in-bed dolomite in order to reduce the tar content in the product gas. The gas composition and tar contents in the product gas at different temperatures were measured and analyzed. The results show that there is no big difference between two cases with and without dolomite at low temperature of 700C. However, at high temperature of 900C, the tar content was reduced significantly by the addition of in-bed dolomite. Temperature has a strong effect on the efficiency of dolomite catalyst
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| 9. |
- Zhang, Wennan, et al.
(författare)
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Process simulation of circulating fluidized beds with combustion/gasification of biomass.
- 2002
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Ingår i: Twelfth European Biomass Conference - Biomass for Energy, Industry and Climate Protection. - Florence : ETA. - 889004425X ; , s. 1503-
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Konferensbidrag (refereegranskat)abstract
- This paper briefly presents the work carried out for the 4th framework Joule project under the contract JOR3CT980306. The project is to build up an integrated mathematical model to predict reactor performance of biomass circulating fluidized bed boiler/gasifier when reactor design, operating conditions and fuel properties are defined. For CFB boilers, the sub-models of combustion, heat transfer, ash deposition on a heat transfer surface and NOx/N2O emission have been developed, and evaluated against the 12 MW Chalmers CFB boiler. For CFB gasifiers, the sub-models of gasification, heat transfer, NH3/HCN emission, alkali ash and tar emissions from the gasifiers are developed. The results have been checked on Sanya 6MW industrial biomass CFB gasifier.
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