Methane Pyrolysis Hydrogen Supply for Low-Emission Oilfield Power
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Solution Overview
Problem
Existing oilfield equipment at well stimulation sites, such as hydraulic fracturing units, are inefficiently powered by diesel engines with high carbon emissions, and current hydrogen production methods, like water electrolysis and steam methane reforming, either emit CO2 or are undesirable due to inefficiencies.
Innovation Solution
Convert methane into molecular hydrogen and solid carbon through pyrolysis, using microwave reactors with catalysts to generate hydrogen for fuel cells or internal combustion engines, minimizing CO2 emissions by recycling carbon dioxide and utilizing renewable energy for heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If diesel engines are used to power oilfield equipment, then equipment can operate reliably, but carbon dioxide emissions increase and energy efficiency decreases
Solution Approach 1:
The invention changes the chemical composition parameters of the fuel by blending hydrogen with diesel or natural gas. This parameter change enables the system to achieve lower emissions and improved energy efficiency while maintaining reliable operation of oilfield equipment. The hydrogen content in the fuel blend is optimized to balance performance and environmental benefits.
Solution Approach 2:
The invention uses composite fuel materials by combining hydrogen with diesel or natural gas to create a blended fuel system. This composite approach leverages the high energy density of diesel/natural gas and the clean-burning properties of hydrogen, resolving the contradiction between reliable equipment operation and reduced carbon emissions.
2Object-affected harmful factors
If water electrolysis is used to produce hydrogen, then hydrogen can be generated without CO2 emissions, but energy consumption increases
Solution Approach 1:
The invention implements a self-service system where waste heat from the fuel cell power generation process is captured and used to drive the water electrolysis reaction. This internal heat recycling eliminates the need for external energy input for hydrogen production, resolving the contradiction between zero CO2 emissions and high energy consumption.
Solution Approach 2:
The invention converts the waste heat (a harmful byproduct of fuel cell operation) into a useful resource for driving water electrolysis. This transforms an energy loss into a productive input, enabling sustainable hydrogen production without additional energy consumption.
3Productivity
If steam methane reforming is used to produce hydrogen, then hydrogen production efficiency improves, but CO2 emissions increase
Solution Approach 1:
The invention captures the CO2 produced during steam methane reforming and uses it as feedstock for synthetic fuel production. This converts the harmful CO2 emission into a valuable resource, maintaining high hydrogen production efficiency while eliminating net CO2 emissions through carbon recycling.
Solution Approach 2:
Instead of discarding CO2 as a waste product, the invention recovers and utilizes it in the synthetic fuel synthesis process. This circular approach maintains productivity while transforming the harmful emission into a useful component of the fuel blend.
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
Achieves efficient, low-emission power for oilfield equipment by using hydrogen from methane pyrolysis, reducing fossil fuel consumption and lowering carbon footprint through energy storage and carbon recycling.
Implementation Method 1
Convert methane into molecular hydrogen and solid carbon through pyrolysis, using microwave reactors with catalysts
Implementation Method 2
using hydrogen from methane pyrolysis, reducing fossil fuel consumption and lowering carbon footprint through energy storage and carbon recycling
Data Source
AI summary
Provided are methods and systems to convert a one-carbon-containing molecule through pyrolysis reactions into solid carbon and molecular hydrogen gas without emission of carbon dioxide. The methods may include converting the one-carbon-containing molecule into electricity with a co-production of carbon dioxide, pyrolyzing at least methane to produce at least carbon and hydrogen, and reacting at least a portion of the carbon dioxide and at least a portion of the hydrogen to produce at least additional one-carbon-containing molecule. In other examples, the methods may include pyrolyzing methane to produce at least solid carbon and hydrogen, feeding at least a portion of the hydrogen to a fuel cell to produce electricity and heat, capturing at least a portion of the heat from the fuel cell, preheating the methane prior to the pyrolyzing with the captured heat from the fuel cell, and powering oilfield equipment with at least a portion of the electricity.