Prechamber Cooling Device for Gas Engine Synthesis Gas
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Solution Overview
Problem
Internal combustion engines face challenges with high thermal loading and reduced service life of prechambers due to direct introduction of high-temperature synthesis gas, leading to unwanted self-ignition and hot corrosion, especially in large gas engines operating with lean fuel-air mixtures.
Innovation Solution
A cooling device is integrated to reduce the temperature of synthesis gas before it is introduced into the prechamber, utilizing a multi-stage cooling system as part of the engine's cooling circuit, and an autothermal reformer produces synthesis gas with a high calorific value using combustion fuels with a high calorific value, along with the use of exhaust gas and water vapor to optimize scavenging gas composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-temperature synthesis gas is directly introduced into the prechamber, then combustion efficiency is improved, but thermal loading on prechamber components increases and service life is reduced
Solution Approach 1:
The synthesis gas is cooled in advance before being introduced into the prechamber. The cooling device is arranged in the synthesis gas conduit upstream of the prechamber to reduce the temperature of the synthesis gas to between 20°C and 200°C, preventing thermal damage to prechamber components while maintaining combustion efficiency.
Solution Approach 2:
A cooling device acts as an intermediary between the reformer and the prechamber. This intermediary component (cooling device with heat exchanger) mediates the temperature of the synthesis gas, reducing it from high temperature to a suitable range before introduction into the prechamber, thereby protecting components while preserving combustion performance.
2Power
If high-temperature synthesis gas is directly introduced into the prechamber, then energy density intensive ignition flares are achieved, but hot corrosion and unwanted self-ignition occur
Solution Approach 1:
The synthesis gas is cooled in advance before introduction into the prechamber to prevent hot corrosion and unwanted self-ignition. The cooling device reduces the temperature to between 20°C and 200°C, eliminating the harmful thermal effects while the scavenging gas enrichment maintains the necessary ignition flare energy density.
Solution Approach 2:
The temperature parameter of the synthesis gas is changed from high temperature (direct from reformer) to a controlled range of 20°C to 200°C through the cooling device. This parameter change eliminates hot corrosion and self-ignition risks while the scavenging gas composition adjustment maintains combustion performance.
3Object-generated harmful factors
If lean fuel-air mixture is used in the main combustion chamber, then pollutant emission and thermal loading are minimized, but ignition and combustion of very lean mixtures becomes challenging
Solution Approach 1:
The prechamber acts as an intermediary ignition chamber that enriches the lean fuel-air mixture from the main combustion chamber. By introducing synthesized scavenging gas (rich in hydrogen and carbon monoxide) into the prechamber, reliable ignition is achieved, and the resulting ignition flares propagate into the main combustion chamber, enabling stable combustion of very lean mixtures with minimal emissions.
Solution Approach 2:
Different regions of the combustion system have different fuel-air mixture qualities. The main combustion chamber operates with lean mixtures (low pollutant emission), while the prechamber receives enriched mixtures through scavenging gas injection (high ignition reliability). This local quality differentiation resolves the contradiction between emission reduction and combustion reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cooling device mitigates thermal loading and extends the service life of prechamber components by reducing unnecessary heat, while optimizing scavenging gas composition for improved combustion efficiency and reduced emissions, minimizing nitrogen oxide and soot formation.
Implementation Method 1
A cooling device is integrated to reduce the temperature of synthesis gas before it is introduced into the prechamber, utilizing a multi-stage cooling system as part of the engine's cooling circuit
Implementation Method 2
an autothermal reformer produces synthesis gas with a high calorific value using combustion fuels with a high calorific value
Implementation Method 3
A scavenging gas mixer received an engine fuel which can be fed by an engine fuel conduit from the first engine fuel source or from a second engine fuel source, and a synthesis gas which can be fed by a synthesis gas conduit to be mixed
Implementation Method 4
In internal combustion engines which are operated on the basis of the Otto cycle, ignition of a fuel-air mixture is effected in the combustion chamber by ignition devices
Data Source
AI summary
An internal combustion engine, in particular a stationary gas engine, includes a combustion chamber to which a propellant can be fed from a first propellant source via a combustion chamber pipe, and a pre-combustion chamber to which a flushing gas can be fed via a flushing gas pipe. A flushing gas mixer, in which a propellant to be fed via a propellant pipe from the first propellant source or from a second propellant source, and a synthesis gas to be fed via a synthesis gas pipe, can be mixed is provided. A mixer outlet opens into the flushing gas pipe, and the synthesis gas can be generated by a reformer to which a fuel can be fed from a fuel source via a reformer feed pipe. The reformer outlet of the reformer opens into the synthesis gas pipe, and a cooling device for cooling the synthesis gas is provided.