A dual fired downdraft gasifier system to produce cleaner gas for power generation: Design, development and performance analysis

Raman, P.; Ram, N.K.; Gupta, Ruchi

doi:10.1016/j.energy.2013.03.019

Cited by 69 publications

(22 citation statements)

References 28 publications

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“…The release of hydrocarbons occurs around 800 • C, with the secondary air entry into the fibered, and the gases are burned with a visible flame. The chemical processes and corresponding energy changes can be represented as follows: The proposed system differs in many respects from what is known in the literature, mainly because of the simplifications of top-fed and bottom-fed solutions [14][15][16].…”

Section: Description Of the Developed System Within The Projectmentioning

confidence: 99%

Improving the Efficiency of Pyrolysis and Increasing the Quality of Gas Production through Optimization of Prototype Systems

et al. 2019

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Pyrolysis is a thermochemical process that consists of the degradation of organic polymers and biomass minerals in lignocellulose materials. At low pyrolysis temperature (300–400 °C), primarily carbon is produced during the reaction time. Rapid pyrolysis takes place at temperatures between 500 and 650 °C. If the temperature is higher than 700 °C, the final product is methane, also known as biogas. The pyrolysis generator can be combined with a small power plant (CHP), which is a promising technology because the unit can be installed directly near the biomass production, and electricity can be fed de-centrally to the public utility network, while there are several possibilities for using waste heat in local systems. Carbonaceous ash can be utilized well in the agricultural field, because, in areas with intensive farming, the soil suffers from carbon and mineral deficiencies, and the phenomenon of material defect can be reduced by a proper level of implementation. This study describes the technical content of the biochar pilot project, and then, through a detailed presentation of the experimental results, we interpret the new scientific results. Our aim is to improve the quality of the produced gas by increasing the efficiency of the pyrolysis generator. In order for the pyrolysis unit to operate continuously, with proper efficiency and good gas quality, it is necessary to optimize the operation process. Our review reveals that the use of vibration may be advantageous during pyrolysis, which affects the mass of the pyrolysis carbon in a plane. Accordingly, the application of vibration to the input section of the funnel might enhance the quality of the gas, as well. The study concludes that more accurate dimensioning of the main parts of the gas reactor and a more convenient design of the oxidation and reduction zones enhance the good-quality gas output.

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Section: Description Of the Developed System Within The Projectmentioning

confidence: 99%

Improving the Efficiency of Pyrolysis and Increasing the Quality of Gas Production through Optimization of Prototype Systems

et al. 2019

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“…Heating value of syngas affects performance of the downstream power generation unit [21]. The lower heating values (LHVs) of syngas sampled at the outlet of the wood shavings filter for the three treatments were in the range of 5-6 MJ·Nm −3 .…”

Section: Heating Value Of Syngasmentioning

confidence: 99%

“…However, the final tar content (27 g/Nm 3 ) obtained in this treatment was higher than those obtained with dry filter used with direct (touch) syngas cooling and cleaning systems, such as sand bed filter with water spray towers (1.5 g/Nm 3 final tar content) [15] and coconut coir filter with water scrubber (1.4 g/Nm 3 final tar content) [17]. Similarly, the final tar content of this treatment is high than those of cleaning systems with a heat exchanger with bag house filter (35 mg/Nm 3 ) [21]; and heat exchanger with venture scrubber (10 mg/Nm 3 ) [22]. High outlet tar content in this study can be attributed to two primary reasons: (i) indirect cooling, used in this study, has low tar removal effectiveness; and (ii) inlet tar content was high (70 g/Nm 3 vs. <10 g/Nm 3 ) [15,19].…”

Section: Tar Reduction Efficiency Of Wood Shavings Filter (Treatment I)mentioning

confidence: 99%

“…However, wet cleaning systems require expensive waste water treatment, so safe discharge of the tar mixed solution is a challenge [15][16][17]. A series of heat exchangers [20][21][22] and oil scrubber [23][24][25][26][27] have shown to be effective in reducing tar to as low as 10 mg/Nm 3 . The tar collected from the heat exchanger and used oil from the oil scrubber can be recycled back to the gasifier [28,29], which eliminates waste effluent treatment.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Syngas Cooling and Biomass Filter Medium on Tar Removal

et al. 2017

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Biomass gasification is a proven technology; however, one of the major obstacles in using product syngas for electric power generation and biofuels is the removal of tar. The purpose of this research was to develop and evaluate effectiveness of tar removal methods by cooling the syngas and using wood shavings as filtering media. The performance of the wood shavings filter equipped with an oil bubbler and heat exchanger as cooling systems was tested using tar-laden syngas generated from a 20-kW downdraft gasifier. The tar reduction efficiencies of wood shavings filter, wood shavings filter with heat exchanger, and wood shavings filter with oil bubbler were 10%, 61%, and 97%, respectively.

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“…The input of air in the reduction zone changes the nature of the charcoal layer into an activated carbon and is capable of capturing tar components. Equivalent ratio as control variables remain within the optimum range of 0.2-0.4 so that the heating value and cold gas efficiency are not decreased and even reach 7.88 MJ/Nm 3 and 89.7% [12,13,14] This paper reports the results of experiments that have been carried out using a multi-stage downdraft gasifier to determine the effect of operating conditions (air ratio, equivalent ratio) to the gas composition, heating value, gasifier efficiency, and tar produced is also calculated. The aim of this study was to obtain optimum operating conditions that can have a significant influence to the performance of the gasifier.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on multi-stage downdraft gasification: Influence of air ratio and equivalent ratio to the gasifier performance

Saleh¹,

Sudarmanta²

2018

AIP Conference Proceedings

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Abstract. Multi-stage gasification process adding multiple air injection (at pyrolysis and oxidation) to reduce tar content and improve the efficiency. all components of the fuel can decompose perfectly into pyrolysis products and the total pyrolysis product also increases. The mean temperatures in the pyrolysis zone are respectively between 569 o C and 633 o C for the 0% and 90% Air Ratios. Temperature increases in the pyrolysis zone change the nature of the endothermal into exothermal and providing the heat energy for the drying, oxidation and reduction zones. While the temperature of the partial oxidation zone reaches 858 o C. For a total air flow of 10.5 Nm 3 /h with a 90% air ratio, the gasifier can produce a low tar content of 32.27 mg/Nm 3 when compared to 0% air ratio of 106.5 mg/Nm 3 . This result shown that multi-stage gasifier can reduce tar content by 30%.

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A dual fired downdraft gasifier system to produce cleaner gas for power generation: Design, development and performance analysis

Cited by 69 publications

References 28 publications

Improving the Efficiency of Pyrolysis and Increasing the Quality of Gas Production through Optimization of Prototype Systems

Improving the Efficiency of Pyrolysis and Increasing the Quality of Gas Production through Optimization of Prototype Systems

Effects of Syngas Cooling and Biomass Filter Medium on Tar Removal

Experimental investigation on multi-stage downdraft gasification: Influence of air ratio and equivalent ratio to the gasifier performance

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