Biodiesel or B100 is produced by a process called trans […]
Biodiesel or B100 is produced by a process called transesterification, which converts any amount of available raw materials (usually various animal fats, vegetable oils and reconstituted oils) into long-chain monoalkyl esters or organisms. Diesel chemicals. These chemicals are also known as fatty acid methyl esters (FAME). During the manufacturing process, the oil or fat reacts with a short chain alcohol, typically methanol, but sometimes ethanol or other alcohol, in the presence of a catalyst such as sodium hydroxide or potassium hydroxide to form biodiesel.
Most technologies currently dealing with petroleum diesel can handle B20. In fact, in its B20 configuration, biodiesel has little effect (if any) on compression-ignition engines, fuel and oil-fired boilers, turbines or pumps, hoses, seals, gaskets, swivels, etc. Load arms, valves, fittings and other equipment for handling, transport and storage. (Users should note that if oxidized metals such as copper, bronze, brass or zinc are present, B20 may degrade faster than petroleum diesel.)
B100 will degrade, soften or penetrate some hoses, gaskets, seals, elastomers, glues and plastics during prolonged use; compounds that are particularly susceptible to degradation include nitrile rubber, polypropylene and polyethylene. Non-metallic materials that have been shown to be compatible with B100 include PTFE, some FKM formulations, various fluorinated plastics and nylon. Metals compatible with B100 include ductile iron, stainless steel, carbon steel and aluminum; brass, bronze, copper, lead, tin and zinc are incompatible.
A pump that processes biodiesel through its production, transportation and storage stages is a positive displacement pump with sliding vane technology. The positive displacement pump uses sliding vane technology to handle thin liquids.
Sliding blade technology for biodiesel production
Vane Pump Manufacturers Description: Sliding blade technology offers high efficiency and low maintenance advantages, which are important factors in today's rising energy costs, lean personnel and high demand for increased profitability.
For greater flexibility, efficiency and productivity, advanced vane pump designs include motor speed technology and "design" features such as hydrodynamic journal bearings and a mechanical seal. These features are used to further improve the basic pumping process in biodiesel manufacturing. In fact, for the same reason, the sliding vane pump has become the pump technology of choice for the entire North American biodiesel production plant.
The secret behind the operational characteristics of the sliding vane pump is the blades that slide into and out of the pump rotor slot. The rotation of the pump draws liquid behind each blade and enters the pump chamber through the inlet. As the rotor rotates, liquid is transferred between the blades to the outlet where it is discharged. Each blade provides positive mechanical and hydraulic displacement of the liquid. The blade is driven by three forces:
(1) centrifugal force from the rotation of the rotor,
(2) a putter that moves between opposing pairs of blades and
(3) The liquid pressure that enters through the groove and acts on the rear of the blade.
Each rotation of the sliding vane pump replaces a constant volume of fluid; the change in pressure is negligible. The waste of energy in the pump, turbulence and slip, is minimized and maintains high volumetric efficiency. The sliding vane technology also features excellent start-up and pumping capabilities, making the pump ideal for line stripping, high heel evacuation and unloading tanks from the ground or top. Sliding vane pumps for biodiesel applications can provide capacities from 1-gpm to 2,300-gpm.
Sliding vane pumps with hydrodynamic journal bearings eliminate shaft-to-bearing contact, which means little contact or wear, extending bearing life and pump efficiency. Advanced sliding vane pumps can also include cavitation/noise suppression liners to control cavitation wear and reduce noise levels up to 15-db. The compact motor speed sliding vane pump provides reliable continuous operation.
If desired, the vane pump can be serviced by connecting the pipe; if the vane is damaged, the replacement can be accomplished by removing the outer head assembly, sliding the old vane, inserting the new vane and reinstalling the head.
Noting the precautions required to handle B100, the upgraded elastomer seals in many series of sliding vane pumps allow compatibility with all biodiesel blends. The FKM formulation has been upgraded to a premium compound for wider compatibility with a wider range of fuels. These elastomers are UL listed and can be used in all ethanol and biodiesel blends, including B100.
Therefore, as the production and use of biodiesel continues to grow in the United States, there is a huge demand for materials and equipment that can handle its production, transportation, and storage. With a history of handling thin liquids, sliding vane technology is an option for pumping requirements for biodiesel plants, tankers and railway fleets or storage facilities.