Performance - Evaluation of Lignite in a downdraft Gasifier
India is a developing country which lacks an adequate supply of electricity. For many of the interior regions of India, gasification is a good way to produce electricity with standalone gasifier. In many regions of India as well as in the world, a large reserve of lignite is available. Lignite could be a fuel for gasification system. This paper presents the result of the experimental investigations carried out using lignite to investigate the effect of fuel size variation on gas generation rate and performance parameter in terms of calorific value of producer gas and gasifier efficiency in downdraft gasifier. Based on the realization, while studying the effect of gas generation rate, the choice of particle size is playing an important role for flowability study and performance of gasifier. The present work investigates the effect of lignite size variation on temperature profile at different zones in gasifier. They were in the range of 16-19 mm, 19-22 mm, 22-25 mm particle sizes of lignite. For comparative studies, experiments were also carried out on uneven size wood and lignite. It was observed from three particle sizes of lignite that better calorific value (629 kcal/m 3 ) and efficiency of gasifier (46.092%)
Gasification and power generation characteristics of rice husk and rice husk pellet using a downdraft fixed-bed gasifier
Abstract In the present study, gasification of rice husk and rice husk pellet was performed in a bench-scale downdraft fixed-bed gasifier. Gasification was conducted in a temperature range of 600–850 °C, fuel feeding rate of 40–60 kg/h and gasification agent, air, feeding rate of 50–75 Nm 3 /h. From the results, synthetic gas heating value and cold gas efficiency of more than 1300 kcal/Nm 3 and 70% were achieved, respectively. The heating value of synthetic gas and cold gas efficiency from rice husk pellet gasification shows higher value than that of rice husk gasification. To make power generation, the CD800L reciprocating engine designed to basically use LPG fuel was conducted by supplying synthetic gas produced from rice husk pellet gasification. It was confirmed that stable power generation of 10 kW was achieved.
A New Vacuum Pressure Infiltration CFRP Method and Preparation Experimental Study of Composite
In order to prepare a carbon-fiber-reinforced polymer composite (CFRP) with ideal microstructure and properties, a new vacuum pressure infiltration CFRP method is proposed based on an analysis of existing CFRP preparation process methods. Research on composite material preparation systems was carried out by using this new method principle. The system mainly includes a fiber pre-forming module, a vacuum heating infiltration module, a hot-press curing molding module, and a data acquisition control module. Under the conditions of natural curing at 0 MPa + 6 h + 25 °C, vacuum heating curing at –0.05 MPa + 30 min + 80 °C, and hot-press curing at 0.7 MPa + 5 min + 50 °C, a two-dimensional (2D) CFRP with excellent microstructure and properties was successfully prepared. Observing the microstructure of the prepared composite material, it can be found that the inside of the composite material was sufficiently and uniformly infiltrated, and common preparation defects such as holes and delamination were effectively controlled. Through the performance test, the bending strength of the material reached 790 MPa.