| |
 Current
Projects:
The Hydrogen
Bus Technology Validation Program
Dept
of Energy, City of Las Vegas, Air Products and Collier Technologies
Arizona Public
Service and Collier Technologies
Dept of Energy
and Collier Technologies |
|
Dept
of Energy and Collier Technologies
Heavy duty HCNG engine development program for diesel and natural
gas engine replacements.
Collier Technologies, Inc. is developing engine
technology that is applicable for use in heavy-duty vehicle applications.
This patented technology deals specifically with the use of mixtures
of hydrogen and natural gas (called HCNG). This application of
HCNG technology is unique for two reasons. One is the very high
brake mean effective pressure required by the engines. The other
is the very large reduction in regulated exhaust emissions that
can be achieved relative to both diesel and natural gas alternatives.
The design strategy uses mixtures of hydrogen and natural gas
containing at least 30% hydrogen (by volume) and incorporates
lean burn and a fraction of exhaust gas recirculation for charge
dilution to control NOx, CO, and NMHC emissions will be controlled
by an oxidizing catalyst. At this stage in the project, NRG has
developed two candidate engine platforms, ranging from 7.4 to
8.4 liters displacement, of its own for evaluation. A third engine
platform of 11 liters displacement is currently under development.
Testing on one of these platforms has shown NOx levels of 0.15
g/hp-hr using a weighted eight-mode steady state test with CO
emissions essentially eliminated.
The goals for the project are:
- Develop engine configurations that can
replace existing diesel and natural gas engines utilizing HCNG
fuel achieving equivalent power.
- Achieve exhaust emissions of: <0.2
g/hp-hr NOx, <0.01 g/hp-hr CO and NMHC.
The project approach has investigated the following
design variables:
- Compression ratio
- Combustion chamber design
- Ignition system
- Exhaust gas recirculation (EGR)-to-lean
burn ratio
- Exhaust catalysts
- Water injection
|
|
