A Prototype Downdraft Gasifier Design with Mechanical Stirrer for Rice Straw Gasification and Comparative Performance Evaluation for Two Different Airflow Paths

Abstract

In this research, a prototype downdraft throatless gasifier was designed with a mechanical stirrer. The gasifier was designed for gasification of rice straw pellets. The diameter of the reactor was 350 mm and a nominal value for the heat power of biomass input was 70 kW. Rice straws which were collected from Thrace Region of Turkey gasified for determination of the designed gasifier performance in Namik Kemal University Biosystem Engineering Laboratories. The effects of airflow path and stirring process on the gasification efficiency during the gasification process were investigated. Temperatures and airflow rates observed and adjusted by controlling the air flow rate in the automation system constantly. Pellets were gasified using two different airflow paths with the same equivalence ratio of 0.2 and these were compared. Air inlet from the top showed better results than air inlet from tuyeres. For the air inlet from the top, the higher heating value of producer gas was determined as 5.047 MJ Nm -3 and cold gas efficiency was calculated as 65.4%. H 2 /CO ratio was found as 1.385 which was higher than the air inlet from tuyeres.

Multi-level framework for optimal operation of gasifier system utilising crop residues from small and medium-scale farms

“…Based on the outcomes of the technoeconomic model, specific rural farming communities that can meet the conditions of the techno-economic model to ensure technical and economic viability should be identified. (Susanto et al, 2018;Worall et al, 2021;Ma et al, 2015;Gunasekaran et al, 2021) Rice husk (Susastriawan et al, 2019;Ma et al, 2015;Copa et al, 2020;Murugan and Sekhar 2017;Salisu et al (2019)) Rice straw (Dalmiş et al, 2018;Belonio et al, 2018) Maize stalk&husk (Atiya et al, 2017;El-Sattar et al, 2020) Maize cobs (Lubwama, 2010;Suhartono et al, 2016;Biagini, et al 2015;Martínez et al (2020))…”

Semaver ile Entegre Termovoltaik Gerilim Kaynağı

“…A better thermal model is needed to model the performance of the system which takes the convection into account. As a future work, we suggest that rice straw burners given in [18] can also be combined with TEGs to produce electrical power, and the optimization and the enthalpy analysis of such a system can also be made as done in [19].…”

“…Its photograph is shown in Figure 1.a. Its equivalent circuit, which was given in [18], is shown in Figure 1.b. The output voltage of the thermoelectric generator module can be given as…”