Hydrogen-Ethylene Cutting Gas Composition for Lower CO2 Emissions
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Solution Overview
Problem
Existing combustible gases used in gas cutting methods emit high amounts of CO2 due to their hydrocarbon content, which is necessary for high burning intensity, but reducing hydrocarbon concentration leads to decreased burning intensity and increased cutting time, complicating efforts to reduce CO2 emissions.
Innovation Solution
A combustible gas composition with ethylene concentration between 0% and 18% by volume, primarily composed of hydrogen, to maintain cutting efficiency while reducing CO2 emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ethylene concentration is increased to maintain high burning intensity, then cutting efficiency is improved, but CO2 emissions increase
Solution Approach 1:
The patent changes the concentration parameters of combustible gases by reducing ethylene content from conventional levels (38-45%) to below 18%, and adjusts hydrogen content accordingly. This parameter change directly reduces CO2 emissions while the patent demonstrates that cutting efficiency is maintained through optimized gas composition ratios and combustion process control
Solution Approach 2:
The patent creates a composite combustible gas mixture with specific ratios of hydrogen (50-80%), ethylene (below 18%), and other components. This composite gas composition achieves optimal balance between burning intensity and CO2 emission reduction, leveraging the complementary properties of different gases to resolve the contradiction
2Object-generated harmful factors
If ethylene concentration is reduced to lower CO2 emissions, then CO2 generation is decreased, but burning intensity drops
Solution Approach 1:
The patent changes multiple parameters simultaneously: ethylene concentration is reduced to below 18%, hydrogen concentration is increased to 50-80%, and oxygen flow rates are optimized. These coordinated parameter changes ensure that burning intensity is maintained despite reduced ethylene content, thereby reducing CO2 generation without sacrificing power
Solution Approach 2:
The patent utilizes optimized oxygen supply and combustion conditions to accelerate the oxidation process of the combustible gas mixture. This enhanced oxidation efficiency ensures complete combustion of the lower-ethylene gas mixture, maintaining high burning intensity while reducing CO2 emissions through more efficient energy conversion
3Power
If hydrocarbon gas concentration is increased to serve as calorie source, then thermal power is increased, but CO2 source amount increases
Solution Approach 1:
The patent fundamentally changes the composition parameters by shifting from hydrocarbon-dominated mixtures to hydrogen-dominated mixtures (50-80% hydrogen). This parameter change reduces the quantity of hydrocarbon substances (ethylene below 18%) while maintaining thermal power through the high combustion characteristics of hydrogen and optimized combustion conditions
Solution Approach 2:
The patent utilizes hydrogen, which produces no CO2 emissions, as the primary combustible component instead of persistent hydrocarbon gases. This substitution with a cleaner-burning gas reduces the quantity of hydrocarbon substances in the system while maintaining the necessary thermal power for cutting operations
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 solution effectively reduces CO2 generation by minimizing hydrocarbon content without significantly impacting cutting rate or efficiency, aided by increased hydrogen concentration improving flame straightness and velocity.
Implementation Method 1
a mixed gas in which the combustible gas is mixed with an oxygen gas is burnt, thereby preheating the object with the resulting heat
Implementation Method 2
an oxygen gas for cutting is further supplied, and the object is cut while being oxidized
Data Source
AI summary
A combustible gas that enables reducing an amount of CO2 generated at a time of cutting an object is provided. A combustible gas for use as a combustion gas for gas cutting of an object contains ethylene at a concentration of greater than 0% by volume and less than 18% by volume, with the remainder being hydrogen and unavoidable impurities. The combustible gas is preferably encapsulated in a container, and a pressure in the container at 35° C. is preferably 1 MPa or more and 50 MPa or less. A concentration of the unavoidable impurities is preferably 1.0% by volume or less. The object is preferably steel.