scholarly journals Investigation on improving the thermal efficiency of a mini boiler fired with straight vegetable oils

2020 ◽  
Vol 24 (2 Part A) ◽  
pp. 713-722
Author(s):  
Maran Punnaivanam ◽  
Arumugam Krishnan
Keyword(s):  
Vegetable Oils ◽  
Rice Bran ◽  
Thermal Efficiency ◽  
Sunflower Oil ◽  
Rice Bran Oil ◽  
Supply System ◽  
Compressed Air ◽  
Exhaust Gases ◽  
Oil Blends ◽  
Air Supply

In the present work, straight sunflower oil and rice bran oil blended with diesel have been used as fuel diesel in a mini boiler. The thermal efficiency of the boiler and emission levels in the exhaust gases have been investigated by burning the oil blends of varying proportions ranging from 0-50%. An additional air supply system and compressed air atomization of fuel with a new burner have been used to improve the thermal efficiency of the mini boiler. Results revealed that the addi?tional air supply improved the thermal efficiency up-to 7% and reduced the CO and HC emission up-to 40%. The use of compressed air atomization further increased the thermal efficiency up-to 4% and reduced the CO and HC emission up-to 70%.

scholarly journals Determination of Multiple Mycotoxins and Their Natural Occurrence in Edible Vegetable Oils Using Liquid Chromatography–Tandem Mass Spectrometry

Foods ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2795
Author(s):  
Thammaporn Junsai ◽  
Saranya Poapolathep ◽  
Samak Sutjarit ◽  
Mario Giorgi ◽  
Zhaowei Zhang ◽  
...  
Keyword(s):  
Olive Oil ◽  
Vegetable Oil ◽  
Vegetable Oils ◽  
Rice Bran ◽  
Palm Oil ◽  
Sunflower Oil ◽  
Corn Oil ◽  
Rice Bran Oil ◽  
Natural Occurrence ◽  
Ionization Source

The prevalence of mycotoxins is often increased by the climatic conditions prevailing in tropical regions. Reports have revealed the contamination of mycotoxins in some types of vegetable oil. However, vegetable oil is one of the essential ingredients used in food preparation. Thus, this study determined the occurrence of multi-mycotoxins in six types of vegetable oils commercially available in Thailand to assess the consumer health risk. In total, 300 vegetable oil samples (olive oil, palm oil, soybean oil, corn oil, sunflower oil, and rice bran oil) collected from various markets in Thailand were analyzed for the presence of nine mycotoxins, namely, aflatoxin B1 (AFB1), aflatoxin B2 (AFB2), aflatoxin G1 (AFG1), aflatoxin G2 (AFG2), beauvericin (BEA), ochratoxin A (OTA), zearalenone (ZEA), fumonisin B1 (FB1), and fumonisin B2 (FB2) using a quick, easy, cheap, effective, rugged, and safe (QuEChERS)-based procedure and a triple quadrupole mass spectrometer equipped with an electrospray ionization source. The incidences of mycotoxin contamination varied among the different types of oil samples. AFB1, AFB2, ZEA, FB1, and FB2 were most frequently found in contaminated samples. AFB2, BEA, ZEA, FB1, and FB2 contaminated olive oil samples, whereas AFB1, AFB2, AFG2, and OTA contaminated palm oil samples. AFB1, AFB2, and ZEA were found in soybean oils, whereas ZEA, FB1, and FB2 contaminated corn oil samples. AFB1 and AFG1 contaminated sunflower oil samples, whereas AFB1, AFB2, AFG1, and OTA were detected in rice bran oil samples. However, the contamination levels of the analyzed mycotoxins were below the regulatory limits.

Compressed air supply system of vibro‐isolated tools

1992 ◽  
Vol 91 (5) ◽  
pp. 3083-3083
Author(s):  
Marian W. Dobry ◽  
Czeslaw Cempel ◽  
Wieslaw Garbatowski
Keyword(s):  
Supply System ◽  
Compressed Air ◽  
Air Supply

Assessment of Wetting Kinematics and Cooling Performance of Select Vegetable Oils and Mineral-Vegetable Oil Blend Quench Media

2015 ◽  
Vol 830-831 ◽  
pp. 160-163 ◽  
Author(s):  
K.M. Pranesh Rao ◽  
K. Narayan Prabhu
Keyword(s):  
Vegetable Oil ◽  
Vegetable Oils ◽  
Rice Bran ◽  
Canola Oil ◽  
Rice Bran Oil ◽  
Extraction Process ◽  
Mineral Oil ◽  
Heat Extraction ◽  
Cooling Performance ◽  
Oil Blend

Quench hardening is a process where an alloy is heated to solutionizing temperature and held for a definite period, and then rapidly cooled in a quenching medium. Selection of quenchant that can yield desired properties is essential as it governs heat extraction process during quenching. In the present work, the cooling performance of vegetable oil and mineral-vegetable oil blend quench media was assessed. The vegetable oils used in this work were olive oil, canola oil and rice bran oil. The mineral-vegetable oil blends were prepared by blending 10 and 20 vol. % of rice bran and canola oil in mineral oil. Inconel probe of 12.5mm diameter and 60mm height, instrumented with thermocouples were used to characterize quenchants. The probe was heated to 850°C and quenched in the oil medium. The cooling curves at different locations in the probe were used to study wetting kinematics. Inverse modelling technique was used to estimate spatially dependent metal-quenchant interfacial heat flux. It was found that the vegetable oils exhibited very short vapour blanket stage compared to mineral oil and blends. Faster wetting kinematics obtained with blends resulted in uniform heat transfer compared to that of mineral oil. The temperature distribution in the probe quenched in vegetable oils and blends was more uniform compared to that in mineral oil. It is expected that the parts quenched in vegetable oils and blends would lead to better hardness distribution compared to mineral oils.

Development of rice bran oil blends for quality improvement

2015 ◽  
Vol 173 ◽  
pp. 770-777 ◽  
Author(s):  
Monika Choudhary ◽  
Kiran Grover ◽  
Gurpreet Kaur
Keyword(s):  
Quality Improvement ◽  
Rice Bran ◽  
Rice Bran Oil ◽  
Oil Blends

EFFECTS OF CHEMICAL INTERESTERIFICATION ON THE PHYSICOCHEMICAL PROPERTIES OF PALM STEARIN AND RICE BRAN OIL BLENDS

2016 ◽  
Vol 78 (6-5) ◽  
Author(s):  
Norizzah Abd Rashid ◽  
Tunku Saidatul Sa’adiah Tunku Safuan ◽  
Amalyna Teja Kelana ◽  
Mohd Akram Zuher ◽  
Zaliha Omar
Keyword(s):  
Rice Bran ◽  
Rice Bran Oil ◽  
Solid Fat Content ◽  
Palm Stearin ◽  
Chemical Interesterification ◽  
Mass Ratio ◽  
Hardness Index ◽  
Slip Melting Point ◽  
Oil Blends ◽  
Before And After

Palm stearin (PS) and rice bran oil (RBO) were blended in the mass ratio of 100:0, 70:30, 50:50, 30:70 and 0:100. The oil blends were subjected to chemical interesterification (CIE) catalyzed by sodium methoxide (0.2% w/w). The following analysis were carried out before and after CIE: triacylglycerol (TAG) composition, slip melting point (SMP), solid fat content (SFC), microstructure, polymorphism and hardness index (HI).  After chemical interesterification, there were decrease and increase in the amount of several TAG. Changes in TAG composition caused changes in the physical properties of the blends. Both SMP and SFC of all blends decreased significantly (p<0.05) after interesterification except for RBO. Chemical interesterification also reduced the eutectic interaction at 5°C. However, for hardness index, only blends with 50% and 100% PS decreased significantly (p<0.05) from 33.197 to 26.097 and 5.397 to 3.720, respectively. The crystals of the blends became smaller and reduced in number after interesterification. Interesterification promoted the formation of more β' crystals than β in all blends. The 30:70 PSRBO blend was the most suitable for margarine production as it melted close to body temperature.

Evaluation of the tribological properties and oxidative stability of epoxidized and ring opened products of pure rice bran oil

2020 ◽  
pp. 135065012095053
Author(s):  
Ananthan D Thampi ◽  
Abhishek R John ◽  
M Muhammed Arif ◽  
S Rani
Keyword(s):  
Hydrogen Peroxide ◽  
Vegetable Oils ◽  
Rice Bran ◽  
Rice Bran Oil ◽  
Research Work ◽  
Viscosity Index ◽  
Oxidation Stability ◽  
High Viscosity ◽  
Molar Ratio ◽  
Four Levels

Vegetable oils constitute a potential base stock for bio-lubricants, which has good biodegradability, high flash point, high viscosity index and excellent boundary lubrication properties. They also possess some limitations like low thermal and oxidation stability, poor low temperature properties and narrow range of viscosities. These limitations can be altered by modifying the vegetable oils chemically or by providing additives into the oils. This research work focused on the chemical modification of pure rice bran oil by epoxidation process using 30% hydrogen peroxide and glacial acetic acid. The epoxidized rice bran oil was then subjected to ring opening process using butanoic acid. The epoxidation process was optimized with four factors (Temperature, Time, Weight % of Catalyst, Hydrogen Peroxide molar ratio), each factors having four levels. The lubricant properties of pure rice bran oil (RBO), epoxidized rice bran oil (ERBO) and ring opened rice bran oil (RRBO) were studied. It was noted that the lubricant properties of ERBO and RRBO were better compared to pure RBO.

Experimental investigation of the combustion characteristics of a biodiesel (rice-bran oil methyl ester)-fuelled direct-injection transportation diesel engine

2007 ◽  
Vol 221 (8) ◽  
pp. 921-932 ◽  
Author(s):  
S Sinha ◽  
A K Agarwal
Keyword(s):  
Diesel Engine ◽  
Methyl Ester ◽  
Vegetable Oils ◽  
Rice Bran ◽  
Rice Bran Oil ◽  
Direct Injection ◽  
Pressure Rise ◽  
Cylinder Pressure ◽  
Biodiesel Blends ◽  
Crank Angle

Increased environmental awareness and depletion of fossil petroleum resources are driving industry to develop alternative fuels that are environmentally more acceptable. Transesterified vegetable oil derivatives called ‘biodiesel’ appear to be the most convenient way of utilizing bio-origin vegetable oils as substitute fuels in diesel engines. The methyl esters of vegetable oils do not require significant modification of existing engine hardware. Previous research has shown that biodiesel has comparable performance and lower brake specific fuel consumption than diesel with significant reduction in emissions of CO, hydrocarbons (HC), and smoke but slightly increased NO x emissions. In the present experimental research work, methyl ester of rice-bran oil is derived through transesterification of rice-bran oil using methanol in the presence of sodium hydroxide (NaOH) catalyst. Experimental investigations have been carried out to examine the combustion characteristics in a direct injection transportation diesel engine running with diesel, biodiesel (rice-bran oil methyl ester), and its blends with diesel. Engine tests were performed at different engine loads ranging from no load to rated (100 per cent) load at two different engine speeds (1400 and 1800 r/min). A careful analysis of the cylinder pressure rise, heat release, and other combustion parameters such as the cylinder peak combustion pressure, rate of pressure rise, crank angle at which peak pressure occurs, rate of pressure rise, and mass burning rates was carried out. All test fuels exhibited similar combustion stages as diesel; however, biodiesel blends showed an earlier start of combustion and lower heat release during premixed combustion phase at all engine load-speed combinations. The maximum cylinder pressure reduces as the fraction of biodiesel increases in the blend and, at higher engine loads, the crank angle position of the peak cylinder pressure for biodiesel blends shifted away from the top dead centre in comparison with baseline diesel data. The maximum rate of pressure rise was found to be higher for diesel at higher engine loads; however, combustion duration was higher for biodiesel blends.

Formulation of bio-lubricant based on modified rice bran oil with stearic acid as an anti-wear additive

2020 ◽  
pp. 135065012097738
Author(s):  
Edla Sneha ◽  
RB Akhil ◽  
Abhijith Krishna ◽  
S Rani ◽  
S Anoop Kumar
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Stearic Acid ◽  
Chemical Modification ◽  
Vegetable Oils ◽  
Rice Bran ◽  
Rice Bran Oil ◽  
Chemical Properties ◽  
Wear Properties ◽  
Medium Temperature

Bio-lubricants are commonly manufactured from vegetable oils. Rice bran oil is found to be an ideal choice as a base stock for industrial lubricants, among many other vegetable oils, based on its fatty acid composition capable of yielding favourable tribological properties. To improve the chemical properties of rice bran oil, chemical modification through transesterification is attempted. Even though transesterified rice bran oil exhibits better chemical properties, the tribological and rheological properties are found to be compromised. The addition of bio-additive stearic acid is found to substantially improve the wear properties of transesterified rice bran oil. A novel bio-lubricant for medium-temperature applications is thus formulated based on rice bran oil.

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