As the fossil fuels are depleting day by day, so there is a need to reach for an alternative fuel... more As the fossil fuels are depleting day by day, so there is a need to reach for an alternative fuel to meet the energy demand of the world. The various oil sources classified as edible and non edible the edible sources like groundnut, peanut etc are primarily used to meet the food requirement but the excess supplies can be converted to biodiesel. Since India is already importing 70% of the edible oils and therefore the diversion of edible oil for biodiesel production is not possible. The option rests only on the nonedible oils for conversion to biodiesel. The main quality problem with biodiesel is its oxidation stability that plays an important role in determining the quality. Which is the resistance of oil/fats/biodiesel to degradation through oxidation with air? The rapidity of oxidation depends on the degree of unsaturation, the presence of antioxidants, and prior storage conditions. This auto oxidation caused by contact with air during long term storage presents a legitimate conce...
The rise in petroleum price and uncertainties in fossil fuel availability, there is renewed inter... more The rise in petroleum price and uncertainties in fossil fuel availability, there is renewed interest in vegetable oil fuels for diesel engines. The vegetable oil can be used as alternative fuel to diesel. But there are two problems associated with use of vegetable oil as fuel are oxidation stability and cold flow property. The use of vegetable oil as bio fuel is limited due to poor stability characteristics of this oil. The poor stability leads to gum formation which further leads to storage problem of these fuels for longer period of time. The high temperature engine performance is also affected due to poor thermal stability of the bio fuel obtained from vegetable oil. To overcome these stability related problems various chemical substances (natural as well as synthetic) in nature are used as antioxidants. These antioxidants improve the stability characteristics of bio fuels. The impact of various metals on the oxidation stability of various bio fuel sources is also investigated in...
ABSTRACT Cold flow properties are the main issue regarding the development of Pongamia biodiesel ... more ABSTRACT Cold flow properties are the main issue regarding the development of Pongamia biodiesel as alternative fuel to diesel. The poor cold flow property of biodiesel results in gum formation and crystallization of fuel particles which can be improved by winterization, blending and addition of cold flow improvers. The experimental investigation shows that Cloud Point and Pour Point of Pongamia biodiesel (PB100) is 20 �C and 19 �C respectively. The winterization process results in improvement of 5 �C in CP and PP respectively for PB100. The blending of Pongamia biodiesel with diesel and kerosene results in improvement of Cloud Point by 9 and 11.5 �C and Pour Point by 11 and 12.5 �C respectively. It is found that ethanol as cold flow improver plays major role in enhancement of Cloud Point and Pour Point as it improve both by 10 �C. The result of investigation recommends the use of PE20 fuel for engine operation under cold climatic condition without any fuel quality problem. Out of various methods for improving cold flow properties addition of cold flow improver is best method to achieve the desired values of cold flow properties for biodiesel.
As the fossil fuels are depleting day by day, so there is a need to reach for an alternative fuel... more As the fossil fuels are depleting day by day, so there is a need to reach for an alternative fuel to meet the energy demand of the world. The various oil sources classified as edible and non edible the edible sources like groundnut, peanut etc are primarily used to meet the food requirement but the excess supplies can be converted to biodiesel. Since India is already importing 70% of the edible oils and therefore the diversion of edible oil for biodiesel production is not possible. The option rests only on the nonedible oils for conversion to biodiesel. The main quality problem with biodiesel is its oxidation stability that plays an important role in determining the quality. Which is the resistance of oil/fats/biodiesel to degradation through oxidation with air? The rapidity of oxidation depends on the degree of unsaturation, the presence of antioxidants, and prior storage conditions. This auto oxidation caused by contact with air during long term storage presents a legitimate conce...
The rise in petroleum price and uncertainties in fossil fuel availability, there is renewed inter... more The rise in petroleum price and uncertainties in fossil fuel availability, there is renewed interest in vegetable oil fuels for diesel engines. The vegetable oil can be used as alternative fuel to diesel. But there are two problems associated with use of vegetable oil as fuel are oxidation stability and cold flow property. The use of vegetable oil as bio fuel is limited due to poor stability characteristics of this oil. The poor stability leads to gum formation which further leads to storage problem of these fuels for longer period of time. The high temperature engine performance is also affected due to poor thermal stability of the bio fuel obtained from vegetable oil. To overcome these stability related problems various chemical substances (natural as well as synthetic) in nature are used as antioxidants. These antioxidants improve the stability characteristics of bio fuels. The impact of various metals on the oxidation stability of various bio fuel sources is also investigated in...
ABSTRACT Cold flow properties are the main issue regarding the development of Pongamia biodiesel ... more ABSTRACT Cold flow properties are the main issue regarding the development of Pongamia biodiesel as alternative fuel to diesel. The poor cold flow property of biodiesel results in gum formation and crystallization of fuel particles which can be improved by winterization, blending and addition of cold flow improvers. The experimental investigation shows that Cloud Point and Pour Point of Pongamia biodiesel (PB100) is 20 �C and 19 �C respectively. The winterization process results in improvement of 5 �C in CP and PP respectively for PB100. The blending of Pongamia biodiesel with diesel and kerosene results in improvement of Cloud Point by 9 and 11.5 �C and Pour Point by 11 and 12.5 �C respectively. It is found that ethanol as cold flow improver plays major role in enhancement of Cloud Point and Pour Point as it improve both by 10 �C. The result of investigation recommends the use of PE20 fuel for engine operation under cold climatic condition without any fuel quality problem. Out of various methods for improving cold flow properties addition of cold flow improver is best method to achieve the desired values of cold flow properties for biodiesel.
Uploads
Papers by Gaurav Dwivedi