Ammonia NH3, H2, NH4...a Different twist
to fueling. Chinese.
08 May 2023
It will not be long….and some
references that may help Blaze, CMR. Dual Fueling.
“Go…it is a Go, Colin Wolden,” GJS Blaze Dual Fueling of Ammonium,
Colorado School of Mines.
GJS
Load-control
strategies for ammonia-hydrogen dual-fuel engine for hybrid power
systems
23 April 2023
A team at Beijing
University of Technology has evaluated four load control
strategies—throttle, ammonia-hydrogen ratio, air–fuel ratio, and
variable valve timing—for an ammonia-hydrogen dual fuel Miller cycle
spark ignition engine in a hybrid system. A paper on their work
appears in the journal Fuel.
The engine—a Miller
cycle engine with a compression ratio of 10.7—was modified with a set
of hydrogen common rail and ammonia common rail installed on the
intake manifold to realize the controllable supply of ammonia and
hydrogen.
In the 1960s, the
researchers noted, GM studied the performance of ammonia combustion
engines and found them to be significantly less thermally efficient
than gasoline-fueled engines. However, hydrogen burns fast, has a wide
flammable limit, and has low ignition energy, making it very suited as
an additive to ammonia.
The team found that
the throttle strategy provides the widest output range, and the BMEP
is raised from a minimum of 1 bar to 7.4 bar. The ammonia-hydrogen
mixing ratio strategy is suitable for cold start conditions, fully
utilizing the good combustion characteristics of hydrogen, and at the
same time reducing the amount of hydrogen used in the heat engine
process as much as possible. T
The air–fuel ratio
strategy provides the highest thermal efficiency with a maximum BTE
approaching 40%. It satisfies the energy-saving demand under the
single-point working condition of the engine in the series hybrid
mode.
![](images/images_05_11_2023/Pic1A.jpg)
The variable valve
timing strategy can realize switching between BMEP between 3.5 bar and
6.5 bar, and keep BTE above 33%. The valve timing strategy can not
only provide a wider load adjustment range but also maintain high
thermal efficiency, they found.
… combining the
effects of the four control strategies and the typical operating modes
of the hybrid system, this study suggests that the throttle strategy
is suitable for the feed mode, the VVT strategy is suitable for the
parallel mode, the ammonia-hydrogen mixture ratio strategy is suitable
for the cold start condition, and the air–fuel ratio control is
suitable for the series mode.
—Xin et al.
Resources
-
Gu Xin, Changwei
Ji, Shuofeng Wang, Chen Hong, Hao Meng, Jinxin Yang, Fangxu Su
(2023) “Experimental study on the load control strategy of
ammonia-hydrogen dual-fuel internal combustion engine for hybrid
power system,” Fuel, Volume 347, doi: 10.1016/j.fuel.2023.128396
Posted on 23 April
2023 in Ammonia, Engines, Hydrogen, Market
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