Hydropyrolysis Process for Coal Conversion and Carbon Capture
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Solution Overview
Problem
Current methods for converting hydrocarbon materials into energy products face challenges such as carbon dioxide emissions, high costs, and inefficient energy conversion, particularly in coal combustion and gasification processes, which contribute to environmental concerns and energy inefficiencies.
Innovation Solution
A process involving two-stage reaction zones for hydropyrolysis and methane cracking, utilizing a hydrogen-rich gas stream to convert coal and other hydrocarbons into solid carbon and gaseous hydrogen, where the heat for reactions is provided by exothermicity, allowing for efficient production of electricity with minimal CO2 emissions and recycling of hydrogen for enhanced efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If coal combustion or gasification is used to produce energy, then electrical power can be generated, but carbon dioxide emissions are produced causing environmental harm
Solution Approach 1:
The patent converts the harmful carbon in coal from a pollutant into useful solid carbon products through hydropyrolysis. Instead of combusting carbon to produce CO2, the process chemically transforms carbon into solid forms that can be used as structural materials or stored, while the hydrogen produced is used to generate electricity without CO2 emissions.
Solution Approach 2:
The patent changes the chemical state of carbon from gaseous CO2 (in combustion) to solid carbon products through controlled hydropyrolysis reactions. By altering temperature, pressure, and chemical environment parameters, carbon is transformed into solid forms suitable for various applications, eliminating CO2 emissions while maintaining energy production.
2Power
If traditional coal combustion methods are used, then energy can be produced, but energy conversion efficiency is low and costs are high
Solution Approach 1:
The patent implements a continuous hydropyrolysis process where carbon and hydrogen are continuously converted into useful products. The solid carbon and hydrogen gas are continuously produced and can be immediately utilized, creating an uninterrupted energy conversion process that eliminates the energy losses associated with traditional combustion cycles.
Solution Approach 2:
The patent replaces the mechanical combustion process with a chemical hydropyrolysis process. Instead of burning carbon to generate heat and then converting that heat to mechanical energy and finally to electrical energy (multiple conversion steps with losses), the process directly converts chemical energy into electrical energy through fuel cells or gas turbines, improving overall efficiency.
3Object-generated harmful factors
If carbon dioxide sequestration is implemented to reduce emissions, then environmental harm is reduced, but cost and hazard increase
Solution Approach 1:
Instead of capturing and storing harmful CO2 at great cost and hazard, the patent converts the carbon in coal into useful solid products during the energy conversion process itself. The carbon is transformed into solid forms that can be used as structural materials or stored safely, eliminating the need for separate sequestration infrastructure and reducing both cost and hazard.
4Quantity of substance
If hydrogen is produced through water electrolysis using nuclear reactor power, then hydrogen can be generated, but net energy loss occurs
Solution Approach 1:
The patent makes the process self-sufficient by using the hydrogen produced from hydropyrolysis to generate electricity, which then provides the energy needed for the hydropyrolysis process. This closed-loop system eliminates the need for external energy input from water electrolysis, avoiding net energy loss while maintaining hydrogen production.
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
This process significantly reduces carbon dioxide emissions, achieves high energy conversion efficiencies above 50%, and produces solid carbon products that can be used as structural materials or stored for later use, offering a cost-effective alternative to traditional energy conversion methods.
Implementation Method 1
reacting the feedstock in a first stage exothermic hydropyrolysis reaction zone with a hydrogen-rich gas stream with the primary object of producing methane by devolitilization of the feedstock and reaction of the feedstock carbon with hydrogen
Implementation Method 2
The methane from the first reaction zone is dissociated in a second endothermic reaction zone to produce solid carbon and hydrogen-rich gas using heat mainly from the first reaction zone
Implementation Method 3
All heat to promote the desired extents of reaction in each reaction zone is provided solely from the exothermicity of chemical reactions in the process
Implementation Method 4
Hydrogen gas is recovered to produce electrical energy such that carbon dioxide produced as emissions from the process electrical energy production is less than carbon dioxide emissions from combusting the same feedstock with oxygen
Data Source
AI summary
A process for converting coal and other hydrocarbon solid fuel feedstocks comprises reacting the feedstock in a first stage exothermic hydropyrolysis reaction zone with a hydrogen-rich gas stream for producing methane. The methane from the first reaction zone is dissociated in a second endothermic reaction zone to produce solid carbon and hydrogen-rich gas using heat mainly from the first reaction zone. All heat to promote the desired extents of reaction in each reaction zone is provided solely from the exothermicity of chemical reactions in the process. The majority of the gas is recirculated from the second reaction zone to the first reaction zone. Hydrogen gas is recovered to produce electrical energy for reducing carbon dioxide emissions.