985.29-2 p.04
HON 985A-100/50-ZW-N-NI
1.3 Applications and features
•
Application
– Variable mixing of air and fuel gas for gas engines (e.g. for λ-control, electronic spark control,
combustion-chamber temperature control)
– Mixing gases for operating gas motors with multiple types of fuel gas (e.g. sewage gas, secondary operation
with natural gas)
– In general, mixing all sorts of gases (e.g. boosting low calorific-value gases e.g. waste dump gas)
– Applicable for natural gas, sewage gas, dump gas, mine gas, propane, butane and neutral gases
•
Features
– Simple construction
– Adjustable fuel-gas mixing gap provides for flexible mixing ratios
– Fine adjustment of mixing ratios possible
– Sensitive stepper motors provide for precise adjustment of mixing gap
– Turbulent mixing (homogenization)
Air / fuel gas mixture
not rich enough
too rich
increase the mixing gap
reduce the mixing gap
1.4 Structure and mode of operation
gas 2 (fuel gas) flowing in through an upstream gas pressure control section to the same pressure as gas 1 (air). With the
reduction of the cross-section, there is an acceleration of gas 1 (air) flowing in. Acceleration means the pressure of the gas
For the mixture of the gases, a torpedo designed for maximum flow rates of the gas mixture is integrated in the device.
The downstream flow edges of the torpedo support the turbulent mixing of the two types of gases (homogenization).
For a more precise adjustment of the mixing ratio (λ-control, for instance), there are sensitive electronic control loops
and motors that can adjust the gap according to operational requirements.
Ratio
Precautions
Gas 2
(Fuel gas)
Gas 1
(Air)
Air / fuel
gas mixture
Constriction
device (torpedo)
Venturi nozzle
Adjustable
mixing gap
Mixing zone
Stepper motor
with control*
*) Stepper motor control, e.g. for
– λ-control
– Control of cylinder temperature
– Electronic spark control
Fig 1:
Functional principle
