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UBC Theses and Dissertations
Design and development of a high pressure CNG intensifier Touchette, Alain
Abstract
A two-Stage, variable-stroke rotary-reciprocating intensifier was built in order to provide high pressure natural gas to a diesel engine. In this application, the intake pressure is variable (20 to 200 bar), as is the mass flow (2 to 50 kg/hr) and the delivery pressure is constant (200 bar). The main feature of this intensifier is that it can provide any mass flow in this range regardless of intake pressure or operating speed. The mechanism used to provide the variable mass flow uses a variable stroke. This mechanism, as well as the intensifier configuration, was chosen after investigating the alternative design concepts. This investigation showed that the variable stroke would be an energy efficient method of controlling the intensifier mass flow. The specific intensifier dimensions were determined using a graphical design optimization technique. Prototype testing was limited to speeds below its design operating range because of component failures due to inadequate cooling. In this speed range, the variable stroke proved to be capable of controlling the intensifier mass flow. The rotary-reciprocating geometry was not as energy efficient as originally expected. This shOrtfall is due to large frictional losses in the rotary gas seals and roller bearings. These frictional losses are essentially constant for all strokes which results in low efficiencies at low mass flows. It is suggested that a new intensifier design be considered: a configuration which retains the variable stroke capability of the rotary reciprocating design but eliminates the main sources of frictional losses by using non-rotating pistons.
Item Metadata
| Title |
Design and development of a high pressure CNG intensifier
|
| Creator | |
| Publisher |
University of British Columbia
|
| Date Issued |
1994
|
| Description |
A two-Stage, variable-stroke rotary-reciprocating intensifier was built in order to provide
high pressure natural gas to a diesel engine. In this application, the intake pressure is variable (20
to 200 bar), as is the mass flow (2 to 50 kg/hr) and the delivery pressure is constant (200 bar).
The main feature of this intensifier is that it can provide any mass flow in this range regardless of
intake pressure or operating speed.
The mechanism used to provide the variable mass flow uses a variable stroke. This
mechanism, as well as the intensifier configuration, was chosen after investigating the alternative
design concepts. This investigation showed that the variable stroke would be an energy efficient
method of controlling the intensifier mass flow. The specific intensifier dimensions were
determined using a graphical design optimization technique.
Prototype testing was limited to speeds below its design operating range because of
component failures due to inadequate cooling. In this speed range, the variable stroke proved to
be capable of controlling the intensifier mass flow. The rotary-reciprocating geometry was not as
energy efficient as originally expected. This shOrtfall is due to large frictional losses in the rotary
gas seals and roller bearings. These frictional losses are essentially constant for all strokes which
results in low efficiencies at low mass flows.
It is suggested that a new intensifier design be considered: a configuration which retains
the variable stroke capability of the rotary reciprocating design but eliminates the main sources of
frictional losses by using non-rotating pistons.
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| Extent |
4138394 bytes
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| Genre | |
| Type | |
| File Format |
application/pdf
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| Language |
eng
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| Date Available |
2009-02-27
|
| Provider |
Vancouver : University of British Columbia Library
|
| Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
|
| DOI |
10.14288/1.0081031
|
| URI | |
| Degree | |
| Program | |
| Affiliation | |
| Degree Grantor |
University of British Columbia
|
| Graduation Date |
1994-11
|
| Campus | |
| Scholarly Level |
Graduate
|
| Aggregated Source Repository |
DSpace
|
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.