HUEGLI TECH offers an innovative retrofit technology to convert high speed diesel engines to operate reliably and efficiently in dual fuel mode, i.e. typically with 25% diesel fuel and
75% natural gas, or other gaseous fuel.
No internal modifications to the diesel engine are required;
the standard compression ratio and pistons etc. are retained.
Note: Our system dynamically controls both fuels simultaneously, allowing better response to load changes than a pure
gas engine, whilst maximising cost savings in steady-state
HUEGLI TECH has developped a comprehensive range of key
components, allowing each system to be tailored to meet individual customer requirements.
The system automatically compensates for variations in gas
quality and availability and will continue to function as a pure
diesel engine if the gas supply is interrupted. This allows for
maximum utilisation ofthe most cost-effective gaseous fuels
This kit is an inexpensive method to get an existing high
speed diesel engine running on dual fuel and significantly
reducing fuel costs while retaining the full output power and
flexibility of the original engine.
The larger the engine and the higher the annual running
hours, the shorter the payback period will be.
Return of Investment: Can often be less than 6 Months
• Save money with cheaper fuel
• Simple conversion is cost effective
• Low pressure gas compatible
• 100% power with diesel or dual fuel
• Fast response time
• Improved dynamic performance
• Running clean gas can extend service intervals
*Virtually unlimited Applications e.g
• Gensets converted to use associated gas at oil wells
• Biogas generators on farms turn waste into electricity
• Biofuel/natural gas CHP applications (where the liquid fuel is cheaper but may be subject to shortages until the supply
The development target was to combine simplicity with high
tech components to safely operate the engine at an optimised diesel fuel/gas ratio of at least 25%/75%, and to maintain the same power output and response to load changes
as the original diesel engine.
The HT-SG105 Dual Fuel Module sets the amount of injected
diesel fuel via the diesel actuator (with positional feedback
sensor) linked to the fuel pump. Simultaneously, the HT-SG100 also regulates the amount of gas into the special air/gas blender by means of a throttle body. The air/gas mixture
then passes through the turbo charger, through the inter-
cooler and into the engine. The requested engine speed is controlled by the governor,which measures the engine
speed at the engine ring gear via a speed sensor. Both, isochronous or droop mode are possible.
The HT-SG105 and the HT-SG100 control the fast responding
in such a way to optimise economy in steady state and dynamic performance during load steps.
Protection and Safety
The system protects the engine against harmful situations. Each cylinder exhaust temperature is monitored individually. If the temperature should exceed the set (safe) limit,
the DFC-2000 control reduces the gas portion, and increases
the diesel fuel portion.
All combustion engines are susceptable to harmful knocking (Detonation), but gas-fuelled engines, running hotter,
are more prone than liquid fuelled ones. We strongly recommend the use of an anti-knocking control system. Multiple
knock sensors continually monitor engine vibrations, and
the Antiknock Controller uses these inputs to ensure that
the engine can be run close to, but still within the knocking
As an option, and as an additional protection against overspeed, etc, one or two solenoid-operated air intake shutoff
valves can be supplied.
Whilst looking to minimise the conversion costs, no compromise was made regarding quality. All components are of top
quality and offer utmost reliability, at an affordable price!
A Dual Fuel conversion is a perfect investment for power
users who are looking to upgrade their current system to alternative fuel technology, without revamping their entire system. As a retrofit technology, the HT-SG105 system provides
an economically attractive alternative to buying costly new
With the ability to utilise both fuels, the engine will never
be down due to a lack of adequate gas fuel supply. Another
distinct advantage of dual fuel is the decreased engine wear
that comes with the use of cleaner fuel. Due to a reduction
of carbon soot build-up and cleaner lube oil, longer intervals
between service maintenance can be expected, sometimes
doubled. This means a longer economic life for the engine
and a better overall return on your investment.
To determine approximate cost savings you will need to be
aware of your present fuel cost. The fuel replacement percentage and replacement cost with natural gas is in the ratio
of approx: 25 / 75, but also can be lower. Be sure to apply any
losses of efficiency and always estimate on the safe side.
Ask a HUEGLI TECH representative to help you in determining
your projected annual cost savings including fuel and maintenance.
When considering the cost of natural gas, also bear in mind
that many suppliers are willing to give better rates if they are
able to interrupt your fuel supply. A dual fuel engine, which
can continue to run on diesel alone if the gas is interrupted,
allows the operator to take full advantage of these tarriffs
without compomising system availability.
! Uninterrupted power supply around the clock save
cost for production and investment!
An automatic calculation table is available
in Excel which allows calculating with any fuel cost.
Please contact us so we can provide more informa-
tion to you.
HT-DST4602 AMF and PARALLEL genset controller.
HT-DST4602 is a highly configurable gen-set controller designed to handle
a broad range of critical and complex parallel applications, including multiple Mains and CHP systems. It includes an internal load sharing unit that
allows simple implementation of Multiple Prime Mover applications. PLC
functions (including PID blocks) are available in this unit.
A split version with a separate display and base box is also available