March 9, 2009
Bio-mass : will that be filtering, pyrolysis or gasification?
- “Pratt & Whitney Rocketdyne and Zero Emission Energy Plants, Inc. Sign Gasification Licensing Agreement”,
- “Vegawatt plugs in grease-fired restaurant generator”, and
- “Pratt & Whitney Rocketdyne and AERI Collaborate to Develop Gasification Technology”;
are but three headlines that have appeared over the last several months regarding systems and/ or methods for processing a carbon-containing feedstock into some type of fuel. There are a myriad of techniques for the above processing, each having a different set of pressure, atmosphere and reaction conditions.
The particular combination of reaction conditions being dictated by at least the nature of the feedstock and the desired end product.
- With consideration to the second headline, the Vegawatt system is designed to use waste vegetable oil to generate on-site electricity. It is indicated on the Vegawatt website that a four-stage cleaning process is used to process the waste cooking oil for use as a fuel. In this case the original hydrocarbon chain is most likely still intact. Such a process is quite different from that of the Pratt & Whitney Rocketdyne (PWR) technology.
- A flavour for the PWR gasification technology emerges from visible patent documents. In general PWR appears to have developed a high temperature, high pressure system, similar to a so-called entrained flow gasifier. Published US patent application 2008/0141913 describes a dump cooled gasifier. In particular it describes structures around a slag-based regenerative liner. Published US patent application 2008/0060914 and issued US patent 7,303,597 describe feed systems for use with a gasification system. A common theme emerging from these and other PWR documents is the development of technology around providing for a continuous gasification process.
While the above two approaches appear quite different on the surface there is a least one common thread, the use of what would have been once considered waste as a source of energy. Both processes also discuss the implementation of “waste” heat to further improve the overall energy captured from the fuel.
The Rest @ Getting Technolology Right
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