Gasification of Rice Husk in a Fluidized-Bed Gasifier without Inert Additives

2003 ◽  
Vol 42 (23) ◽  
pp. 5745-5750 ◽  
Author(s):  
Hong Jiang ◽  
Xifeng Zhu ◽  
Qingxiang Guo ◽  
Qingshi Zhu
Keyword(s):  
Fluidized Bed ◽  
Rice Husk ◽  
Fluidized Bed Gasifier

scholarly journals Technological Solutions and Tools for Circular Bioeconomy in Low-Carbon Transition: Simulation Modeling of Rice Husks Gasification for CHP by Aspen PLUS V9 and Feasibility Study by Aspen Process Economic Analyzer

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 2006
Author(s):  
Diamantis Almpantis ◽  
Anastasia Zabaniotou
Keyword(s):  
Fluidized Bed ◽  
Rice Husk ◽  
Aspen Plus ◽  
Economic Assessment ◽  
Product Yield ◽  
Steam Gasification ◽  
Low Carbon ◽  
Simulation Tools ◽  
Fluidized Bed Gasifier ◽  
Annual Earnings

This study explored the suitability of simulation tools for accurately predicting fluidized bed gasification in various scenarios without disturbing the operational system, and dedicating time to experimentation, in the aim of benefiting the decision makers and investors of the low-carbon waste-based bioenergy sector, in accelerating circular bioeconomy solutions. More specifically, this study aimed to offer a customized circular bioeconomy solution for a rice processing residue. The objectives were the simulation and economic assessment of an air atmospheric fluidized bed gasification system fueled with rice husk, for combined heat and power generation, by using the tools of Aspen Plus V9, and the Aspen Process Economic Analyzer. The simulation model was based on the Gibbs energy minimization concept. The technological configurations of the SMARt-CHP technology were used. A parametric study was conducted to understand the influence of process variables on product yield, while three different scenarios were compared: (1) air gasification; (2) steam gasification; and (3) oxygen-steam gasification-based scenario. Simulated results show good accuracy for the prediction of H2 in syngas from air gasification, but not for the other gas components, especially regarding CO and CH4 content. It seems that the RGIBBS and Gibbs free minimization concept is far from simulating the operation of a fluidized bed gasifier. The air gasification scenario for a capacity of 25.000 t/y rice husk was assessed for its economic viability. The economic assessment resulted in net annual earnings of EUR 5.1 million and a positive annual revenue of EUR 168/(t/y), an excellent pay out time (POT = 0.21) and return of investment (ROI = 2.8). The results are dependent on the choices and assumptions made.

Air gasification of rice husk in a dual distributor type fluidized bed gasifier

1999 ◽  
Vol 17 (4) ◽  
pp. 315-332 ◽  
Author(s):  
K.G. Mansaray ◽  
A.E. Ghaly ◽  
A.M. Al-Taweel ◽  
F. Hamdullahpur ◽  
V.I. Ugursal
Keyword(s):  
Fluidized Bed ◽  
Rice Husk ◽  
Fluidized Bed Gasifier

scholarly journals Optimized Production of Syngas from Rice Hush Using Steam Explosion in Dual Fluidized Bed Gasifier

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Ahmad F ◽  
◽  
Ahmad N ◽  
Asghar U ◽  
Ali A ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Rice Husk ◽  
Steam Explosion ◽  
Heating Value ◽  
Gasification Process ◽  
Cold Gas Efficiency ◽  
Product Gas ◽  
Dual Fluidized Bed ◽  
Fluidized Bed Gasifier ◽  
Gas Efficiency

Converting rice husk into energy is a promising method of generating renewable energy and reducing greenhouse gas emissions. In this research rice hush is considered as biomass fuel. The characteristics of rice husk gasification were investigated at an Equivalence Ratio (ER) of 0.25–0.38 and a gasifier temperature of 750-870°C in 20 tons per day (TPD) using steam explosion process in fluidized bed gasifier system. Different operation conditions, temperatures and loads, are investigated for their effects on the compositions, calorific properties, gasification efficiencies of syngas. The effects of the critical parameters, namely, Steam-to-Biomass Ratio (S/B), Particle size variation and gasification temperature on the quality of the product gas as well as the gasifier cold gas efficiency were analyzed. This is the new finding in the research. The optimal conditions of the gasification operation were an ER of 0.20 and gasifier temperature of 800°C. The low heating value of the gas product and cold gas efficiency were 1390kcal/Nm³ and 75%, respectively. After passing the generated gas through the gas cleaning units, it was confirmed that the tar in the product gas was removed with an efficiency of 98%. The cleaned product gas was used for the operation of 420kW, gas engine. Pressure loss often occurred at the bottom of the gasifier during the gasification operation; we found that the agglomerates generated by the gasification process caused it. To prevent the pressure loss caused by the agglomerates, the stable control of temperature inside the gasifier is needed and an ash removal device remove agglomerates should be installed to maintain stable long-term operation. This paper leads towards the production of Syngas and further on the electricity from the rice husk, an eminent biomass, copiously available all around the world. Especially in Pakistan, the rice is used abundantly so the raw material is easily available. The gas is produced using the gasification process in dual fluidized gasifier. It is a wonderful alternative to the natural gas with high calorific value. The sulfur contents are quite less compared to natural gas. It also have a good correlation with environment as flue gases emission is negligible relative to other source like coal, wood, plastic, waste etc. Another benefit of this process is the waste management and pollution control. The results are developed by using the detailed analysis of the process values of plants which is generating electricity by rice husk gasification. We learned, all results revealed that the dual fluidized bed gasification is more economical and efficient method compared to all other methods for commercial scale production of syngas. Results are analyzed which imply that the biomass is more gigantic source which replace the fossil fuels and leads towards the green energy in a more economical way. This paper provides an overview of previous works on combustion and gasification of rice husk in atmospheric fluiuidized bed reactors and summarizes the state of the art knowledge. As the high ash content, low bulk density, p characteristics and low ash melting point makes the other types of reactors like grate furnaces and downdraft gasifers either inefficient or unsuitable for rice husk conversion to energy, the fluiuidized bed reactor seems to be the promising choice. The overview shows that the reported results are from only small bench or lab scale units. Although a combustion efficiency of about 80% can normally be attained; the reported values in the literature, which are more than 95%, seem to be in higher order. Combustion intensity of about 530kg/h/m² is reported. It is also technically feasible to gasify rice husk in a fluidized bed reactor to yield combustible producer gas, even with sufficient heating value for application in internal combustion engines.

scholarly journals Exergy Analysis of Self-Bed Feedstock in Rice Husk Bubbling Fluidized Bed Gasifier

2021 ◽  
Vol 1858 (1) ◽  
pp. 012032
Author(s):  
Kania Amelia Safitri ◽  
Mummayiz Pramono ◽  
Hafif Dafiqurrohman ◽  
Adi Surjosatyo
Keyword(s):  
Fluidized Bed ◽  
Rice Husk ◽  
Exergy Analysis ◽  
Bubbling Fluidized Bed ◽  
Fluidized Bed Gasifier

EXPERIMENTAL STUDY OF A BINARY MIXTURE OF RICE HUSK AND SAND IN A FLUIDIZED BED

2019 ◽  
Author(s):  
Fernando Manente Perrella Balestieri ◽  
Carlos Manuel Romero Luna ◽  
Ivonete Ávila
Keyword(s):  
Experimental Study ◽  
Binary Mixture ◽  
Fluidized Bed ◽  
Rice Husk
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