Effect of air flow rate and secondary air jets on the operation of TLUD gasifier cookstove

Mehta, Yogesh; Richards, C. D.

doi:10.1080/14786451.2019.1671388

Cited by 14 publications

(5 citation statements)

References 20 publications

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“…In another study, experiments were performed using a top-lit-updraft (TLUD) cookstove by making variations in secondary airflow rate, secondary air inlet velocity and primary airflow rate. From this study also it was found that the CO emissions decrease when the secondary airflow increases [16]. Mukunda et al [17] performed a study and found that the secondary air inlet hole diameter affects the performance of a stove.…”

Section: Introductionmentioning

confidence: 58%

Design of a Biomass Micro Gasifier Cookstove by CFD Modelling

Liyanage¹,

Senavirathna²,

Rodrigo³

et al. 2021

Engineer

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This paper presents computational fluid dynamic (CFD) analysis of a natural draft top-lit up-draft (TLUD) biomass cookstove which is acting as a micro pyrolyzing reactor to produce biochar. The effect of the top end geometry, the number of primary and secondary air inlets and their hole patterns, and the number of secondary air outlets and their hole patterns were considered in the design to optimize the performance. Seven different cookstove geometries were simulated to analyse the temperature and air distribution. ANSYS Fluent 16.0 was used to simulate the simplified 3D computational domains of the cookstove designs. The design with uniform air distribution and proper mixing of secondary air and the producer gas was selected as the best cookstove design to fabricate. Experiments were performed with the selected design and the results were compared with the predicted simulation results for evaluating the model. Results revealed a good correlation of 96.67% and a higher R 2 (coefficient of determination) value of 0.9344 for the temperature inside the combustion chamber. Thus, this modelling methodology can be used for the optimization of existing biomass cookstoves and for evaluating naval cookstove designs.

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Section: Introductionmentioning

confidence: 58%

Design of a Biomass Micro Gasifier Cookstove by CFD Modelling

Liyanage¹,

Senavirathna²,

Rodrigo³

et al. 2021

Engineer

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“…The natural-draft Gastov206 has high PM2.5 and CO emissions compared to Mimimoto, a forced-draft TLUD gas er cookstove, reported to have PM2.5 and CO emissions of 13.94 mg/MJ d and 0.154 g/MJ d respectively [44]. Air supply to force draft TLUD gasi ers is by axial fans powered by electricity to favor a good mixture between producer gas and secondary air in the combustion zone [17,46,47]. The gasi er cookstove can make charcoal from biomass during cooking, at a pellet-to-char ratio of 25%.…”

Section: Performance Of Cookstovesmentioning

confidence: 99%

Energy Efficiency and Emissions of a Natural-Draft Wood Pellets Gasifier Compared to Charcoal Cookstoves in Kenya

Gituku¹,

Khisa²,

Bogonko³

et al. 2021

Preprint

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The conversion of biomass to make charcoal fuel is an inefficient process that leads to immense energy losses along the value chain. We compared the energy efficiency and emissions of Gastov206, a natural draft TLUD gasifier cookstove using two sizes of wood pellets, as an alternative to two contemporary charcoal stoves in Kenya. A laboratory test showed that more energy in the fuel was lost by the charcoal cookstoves (69%) compared to the pellet gasifier cookstove (31%). The pellet gasifier cookstove had high thermal efficiency and cooking power (65–73%, 0.95–1.13 kW) compared to the charcoal cookstoves (27–35%, 0.68–0.89 kW). During the test, Gastov206 converted pellets-to-char at a ratio of 25% and a rate of 3 g/min. These findings indicate that when biomass is converted to pellets rather than charcoal, and cooking continues over the burning char generated by the gasifier cookstove, energy currently being wasted converting wood-to-charcoal can be avoided. Gastov206 using pellets showed lower CO emission (4.46–5.47 g/MJd and 0.27–0.39 g/min) compared to charcoal cookstoves (20.82–24.36 g/MJd and 0.89–1.35 g/min). PM2.5 emission by Gastov206 (52.35–61.50 mg/MJd and 3.21–4.37 mg/min) was not significant different compared to charcoal stoves (40.81–41.13 mg/MJd and 1.69–2.35 mg/min). Laboratory results show that natural-draft gasifier cookstoves using pellets can be studied further in kitchens as an alternative to charcoal cookstoves since they are potentially more energy-efficient.

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“…In the TLUD type design, solid fuel is put into the burning chamber in batches from the top and formed a charcoal bed, then it is burned, and pyrolysis occurs below it. Air enters through the bottom (primary air) [8,9] and partially oxidizes the solid fuel results in syngas and a secondary air from the top to complete syngas' combustion process. Roth [12] explains that the combustible gas produce moves upward because of the pressure difference between the gasification zone and the combustion zone.…”

Section: Gasifier Cookstovementioning

confidence: 99%

Quality Function Deployment (QFD) and TRIZ in Briquette Cookstove Design and Simulation

Faria

Ummatin

Junianto

et al. 2021

JRM

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Poor cookstove design can harm the user's health and environment. This research aims to obtain an efficient cookstove design, environmentally friendly and operated easily. The cookstove design process using a combination of QFD and TRIZ. QFD able to capture customer needs through a questionnaire and interview. The data collected then processed to build a House of Quality (HoQ), one of the tools in QFD. QFD results in the design parameter of the briquette cookstove, which is incorporated in the concept design. The TRIZ method is utilized to understand the problem that might occur in the concept design and focus on solving the root causes. The next step is a detailed design where the dimensions, combustion chamber capacity, and supporting features are explained. The combination of QFD and TRIZ result in a briquette cookstove concept design which is easy to clean and operate. The combustion system is Top-lit Up-Draft (TLUD). The burning chamber has two air inlets, namely primary and secondary. The primary air inlet supplies the air from the bottom of the burning chamber, partially burns the briquette, and produces flue gas. The secondary air inlet is in the shape of an oval to supply air in the burning chamber's upper part to burn the flue gas completely. A complete combustion process will increase combustion efficiency and reduce emissions. A computational simulation shows the velocity distribution inside the burning chamber.

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Effect of air flow rate and secondary air jets on the operation of TLUD gasifier cookstove

Cited by 14 publications

References 20 publications

Design of a Biomass Micro Gasifier Cookstove by CFD Modelling

Design of a Biomass Micro Gasifier Cookstove by CFD Modelling

Energy Efficiency and Emissions of a Natural-Draft Wood Pellets Gasifier Compared to Charcoal Cookstoves in Kenya

Quality Function Deployment (QFD) and TRIZ in Briquette Cookstove Design and Simulation

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