Hydrocarbon Gasification Using Pure Oxygen and Recirculation
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Solution Overview
Problem
Current gasification and oxidation processes for hydrocarbon materials in power generation suffer from high emissions and inefficient energy conversion, with conventional technologies releasing nitrous oxides and other pollutants, and failing to maximize energy production from hydrocarbon feedstocks.
Innovation Solution
A closed system process utilizing pure oxygen and water injection for gasification and oxidation, with recirculation of flue gases to optimize energy conversion and minimize atmospheric emissions, featuring a two-chamber system for efficient combustion and product recovery, which eliminates the use of ambient air to reduce nitrogen-related issues and enhance combustion temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If ambient air is used for gasification and oxidation, then the process is simpler and cheaper, but nitrogen-related emissions (nitrous oxides) increase and combustion temperatures decrease
Solution Approach 1:
The patent extracts nitrogen from the gasification and oxidation process by using pure oxygen instead of ambient air. This removes the source of nitrous oxide emissions while maintaining the combustion function. The system separates the oxygen supply function from the ambient air mixture, achieving cleaner combustion without excessive system complexity.
Solution Approach 2:
The patent uses pure oxygen as a strong oxidant to accelerate and intensify the gasification and oxidation processes. This enables higher combustion temperatures and more complete combustion, eliminating nitrous oxide formation while improving energy efficiency and power generation.
2Temperature
If pure oxygen is used for gasification and oxidation, then emissions are reduced and combustion temperatures increase, but system complexity and cost increase
Solution Approach 1:
The patent merges the oxygen supply function with the flue gas recirculation system. The same system that recycles flue gases also supplies pure oxygen to the combustion chambers, combining two functions into one integrated system. This reduces overall system complexity while maintaining high combustion temperatures and low emissions.
Solution Approach 2:
The patent implements feedback control where flue gases are recirculated back to the combustion chambers. This feedback loop optimizes combustion by controlling oxygen concentration and temperature, enabling the system to maintain efficient operation with pure oxygen while automatically adjusting to operational conditions.
3Loss of energy
If flue gases are recirculated to optimize energy conversion, then energy efficiency increases, but emissions control complexity increases
Solution Approach 1:
The patent makes the flue gas recirculation system multi-functional: it recovers energy by preheating combustion air, controls emissions by adjusting oxygen concentration, and stabilizes combustion by moderating temperature fluctuations. This single system performs multiple functions, reducing the need for separate emissions control devices and simplifying overall system complexity.
4Productivity
If all combustion products are recovered and marketed, then profitability increases, but process complexity increases
Solution Approach 1:
The patent implements self-service by using the combustion products themselves to fuel the gasification process. Syngas produced from gasification is burned to generate heat, and flue gases are recirculated to maintain combustion. This internal reuse of products simplifies the recovery system compared to external processing and marketing infrastructure.
Solution Approach 2:
The patent recovers combustion products that would otherwise be discarded as emissions. Syngas is recovered and burned for energy, CO2 is recirculated to control combustion, and heat is recovered to preheat feedstock. This systematic recovery of all combustion products maximizes profitability while using the existing process flow to minimize additional complexity.
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 approach achieves significant reductions in emissions and operational costs, with higher energy efficiency and profitability through the recovery and marketing of all combustion products, exempting the system from stringent regulatory permits and allowing for faster installation and minimal environmental impact.
Implementation Method 1
In the first pyrolysis stage, heat vaporizes the volatile components of the hydrocarbon in the absence of air at temperatures ranging between 450° to 600° C. (842° to 1112° F.).
Implementation Method 2
Gasification is a thermo-chemical process that converts hydrocarbon-containing materials into a combustible gas called producer gas.
Implementation Method 3
The oxidation process is simply the exothermic conversion of producer gas to carbon dioxide and water.
Implementation Method 4
oxidation, which is the process of altering compounds by adding an electro-positive oxygen atom to the compound
Implementation Method 5
This moisture content enables hydrolysis and gasification to occur together.
Data Source
AI summary
A system and process for maximizing the generation of electrical power from a variety of hydrocarbon feedstocks. The hydrocarbon feedstocks are first gasified and then oxidized in a two-chamber system and process using oxygen gas rather than ambient air. Intermediate gases generated in the system and process are recirculated and recycled to the gasification and oxidation chambers in order to maximize energy production. The energy produced through the system and process is used to generate steam and produce power through conventional steam turbine technology. In addition to the release of heat energy, the hydrocarbon feedstocks are oxidized to the pure product compounds of water and carbon dioxide, which are subsequently purified and marketed. The system and process minimizes environmental emissions.