Sliding Feed Lance Plasma Reactor for Carbon Deposit Control
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Solution Overview
Problem
Existing plasma reactors face issues with carbon deposits leading to electrode damage and malfunction due to fouling at hydrocarbon fluid inlets, and liquid-cooled feed lances prone to leaks, resulting in short operating times.
Innovation Solution
A plasma reactor design with a sliding mechanism for the feed lance and controlled dispensing of oxidizing fluid to manage carbon deposits, combined with a heat exchanger for cooling and stabilization of the plasma arc, allowing for extended operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a liquid-cooled feed lance is used to dispense hydrocarbon fluid, then cooling and stabilization of the plasma arc is achieved, but leaks occur leading to electrode damage and reactor malfunction
Solution Approach 1:
The patent replaces the liquid-cooled feed lance mechanism with a gas-cooled alternative. Specifically, an inert gas (such as nitrogen or argon) is circulated through the feed lance instead of liquid coolant, eliminating leaks while maintaining thermal management. The gas flow removes heat from the feed lance interior, preventing carbon deposits and maintaining structural integrity without the reliability issues of liquid cooling systems.
Solution Approach 2:
The patent introduces an inert gas atmosphere through the feed lance to prevent carbon deposits and oxidation. The inert gas (nitrogen or argon) flows through the feed lance interior, creating a protective atmosphere that prevents carbonaceous material from adhering to the feed lance walls and prevents oxidation of the hydrocarbon fluid. This inert environment maintains system reliability while achieving the desired cooling effect.
2Productivity
If hydrocarbon fluid is continuously dispensed through the feed lance, then plasma generation is maintained, but carbon deposits accumulate causing fouling and inlet jamming
Solution Approach 1:
The patent uses a dual-flow gas system where inert gas flows through the feed lance interior to prevent carbon deposits, while hydrocarbon fluid is dispensed through the same feed lance for plasma generation. The pneumatic flow of inert gas creates a protective atmosphere that prevents carbonaceous material from adhering to the feed lance walls, allowing continuous operation without fouling. The gas flow dynamics ensure that carbon particles are swept away from critical surfaces.
Solution Approach 2:
The patent creates an inert gas atmosphere within the feed lace to prevent carbon deposit formation. Inert gas (nitrogen or argon) is circulated through the feed lance interior, establishing a non-reactive environment that prevents carbon from the hydrocarbon fluid from oxidizing and adhering to the feed lance walls. This inert environment allows continuous plasma generation without the harmful effect of carbon fouling.
3Ease of operation
If the feed lance is made movable with a sliding mechanism, then carbon deposits can be removed by retracting the feed lance, but device complexity increases
Solution Approach 1:
The patent implements a movable feed lace mechanism that can be retracted axially relative to the tubular electrodes. The feed lance is designed with sliding elements that allow it to move back and forth along the electrode axis. During normal operation, the feed lance is positioned forward for optimal plasma generation. When carbon deposits accumulate, the feed lace is retracted away from the electrodes, allowing the carbon deposits to be removed or the feed lance to be replaced, thereby simplifying maintenance compared to fixed designs.
Solution Approach 2:
The patent extracts the feed lance as a separate, removable component that can be independently manipulated. The sliding mechanism allows the feed lace to be extracted from the reaction zone by retracting it axially. This extraction capability enables easy removal of carbon deposits either by physically pulling them off when the feed lace is retracted, or by replacing the feed lace entirely, simplifying maintenance without requiring disassembly of the entire reactor system.
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 prevents electrode damage by managing carbon deposits and extends operating time, maintaining efficient hydrocarbon fluid flow and plasma stability.
Implementation Method 1
the plasma torch comprises an inner tubular electrode and an outer tubular electrode... capable of generating a high temperature of more than 1000° C... in operation, the plasma is generated
Implementation Method 2
the hydrocarbon fluid is decomposed at high temperature into an aerosol of carbon and hydrogen
Implementation Method 3
A feed lance for dispensing hydrocarbon fluid is disposed within the inner tubular electrode and is displaceable relative to the tubular electrodes by means of a sliding mechanism during operation
Implementation Method 4
an oxidizing fluid outlet for dispensing oxidizing fluid... the oxidizing fluid can reduce or consume the carbon deposits
Implementation Method 5
a heat exchanger for cooling and stabilization of the plasma arc
Data Source
AI summary
A plasma reactor for decomposing a hydrocarbon fluid includes a reactor chamber and a plasma torch attached to a wall of the reactor chamber and including an inner tubular electrode and an outer tubular electrode. A feed lance projecting into the reactor chamber is arranged inside the inner tubular electrode and is displaceable relative to the tubular electrodes by way of a sliding mechanism. A plasma gas outlet for dispensing plasma gas is between the inner tubular electrode and the outer tubular electrode, and an oxidizing fluid outlet for dispensing oxidizing fluid preferably including CO2 or H2O is disposed within the inner tubular electrode. Related methodology is also disclosed.