Application of Mechanized Conservation Tillage Technology in Dry Land
Shiting Qiu, Qun LV
Sch J Eng Tech | 141-143
DOI : 10.36347/sjet.2020.v08i07.004
Abstract
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China is a large agricultural country, and traditional farming methods have always been a little more extensive. This predatory production has led to further deterioration of the ecological environment. With the continuous development of mechanized protective farming techniques in dry fields, China’s agricultural development has made a qualitative leap. The specific performance is to reduce agricultural production costs, protect the ecological environment, and increase farmers' income. To ensure sustainable development of mechanized conservation tillage in a dry land, it is necessary to promote conservation tillage in dry land according to local conditions. This paper will discuss the technology and application of mechanized conservation tillage in dry land according to the requirement of popularizing mechanized conservation tillage.
Original Research Article
July 16, 2020
Fatty Acid Methyl Ester from Waste Edible Oil: Combustion Characteristics
Nguyen Ngoc Dung
Sch J Eng Tech | 117-126
DOI : 10.36347/sjet.2020.v08i07.001
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Fatty acid methyl ester (FAME) is the most attractive alternative fuel for diesel engines which could resolve ongoing concerns about environmental issues and sustainable energy due to its carbon-neutral characteristic. The main objective of this research was to generate fundamental data on ignition delay and combustion characteristics of FAME. Experiments were carried out in a constant-volume combustion vessel under diesel-engine conditions to study the effects of temperature and pressure on ignition delay and combustion characteristics. Several kinds of BDF fuels (biodiesel fuel or FAME) produced from waste edible oil and having different properties were tested and compared to a standard gas-oil. The experimental results show the strong influence of temperature and pressure on the ignition and combustion processes for the tested fuels. It is shown that (i) the fresh BDF exhibits a longer ignition delay than the gas-oil (conventional diesel fuel), (ii) a small amount of isopropyl alcohol as an additive in BDF promotes the ignition, (iii) the oxidized BDF with acid value changed from 0.1 for the fresh one to 0.22 (KOHmg/g) has a shortened ignition delay, to almost the same as standard gas-oil, and (iv) the blend of BDF with twenty percent by volume to gas-oil results in a reasonable ignition delay. Additionally, the results at pressure 2MPa, which simulates conditions of PCCI (premixed charge compression ignition) engine operations in future engine trends, present two-stage ignition and low-temperature combustion characteristics for both BDF and gas-oil. These findings help improve considerations for the optimal design and operation of diesel engines fuelled with FAME.
Simulation Study to Develop Reactivity Control Compression-Ignition Engine (RCCI)
Nguyen Ngoc Dung
Sch J Eng Tech | 127-131
DOI : 10.36347/sjet.2020.v08i07.002
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The study of reactivity-controlled compression-ignition (RCCI) engine is one of the most important concepts introducing to diesel engine owing to reduce exhaust gas emission. The main objective of this research is to study developing RCCI engine in Vietnam based on simulation. AVL MCC model and Woschni model in AVL Boost software are used to simulated engine combustion and performance characteristics. The result showed that RCCI engine illustrated better combustion process than conventional diesel engine, which increased engine performance and decreased NOx and soot emissions. The study has contribution to the research and development of RCCI engine in Vietnam.
Original Research Article
July 24, 2020
Production of Lightweight Bricks Using Saw Dust
Mushtaq Ahmed, Mahzuz HMA, Rakash Kumer Mondal, Md. Sal-Shabil
Sch J Eng Tech | 132-140
DOI : 10.36347/sjet.2020.v08i07.003
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Clay bricks are widely used for building construction in Bangladesh. Due to rapid urbanization, use of clay bricks is increasing exponentially which leads to air pollution, as well as huge degradation of topsoil from the agricultural lands. Besides, clay bricks increase dead load of structure as they are heavy. In order to minimize these problems, techniques must be innovated for production of low-cost lightweight and eco-friendly bricks. In this study, an attempt was taken to assess the potentiality of locally available saw dust instead of clay to produce lightweight eco-friendly bricks. Total 16 different ratios of cement, saw dust and sand have been taken to prepare samples of saw dust bricks. Compressive strength, unit weight, water absorption rate, fire sensibility and cost of production per brick were analyzed for each type of bricks and compared. The result shows that the compressive strength of bricks was satisfactory for lower percentage of saw- dust. Unit weight of saw dust bricks were reduced by 2 – 42.8 % than that of clay brick and water absorption rate was very low. There was no significant difference between strength of burnt and the unburnt saw dust bricks. Price of saw dust bricks is not higher than that of clay bricks.