Steam Plasma Torch Internal Injection Design
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Solution Overview
Problem
Current steam plasma torches face limitations such as external steam injection leading to nonreactive plasma plumes, low concentration of H+ and OH- ions, high electrode erosion, complex designs with moving parts, and limited power capacity, making them unsuitable for industrial applications.
Innovation Solution
A high power DC non-transferred plasma torch system with a vortex stabilized design that injects superheated steam directly into the plasma plume, using button type cathodes and tubular electrodes to prevent bridging and electrode erosion, and eliminates the need for external high frequency energy sources, featuring a steam vortex generator with tangentially drilled holes to create a high-speed gas swirl.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If steam is injected externally towards the exit of the plasma torch, then the plasma torch can operate with steam as plasma forming gas, but the injected steam will not reach higher temperatures necessary for the formation of reactive H+ and OH- ions resulting in a plasma plume with low or zero concentration of reactive ions
Solution Approach 1:
Instead of injecting steam externally at the exit of the plasma torch where it cannot reach sufficient temperatures, the invention inverts the approach by injecting steam internally at the base of the torch where it immediately contacts the electric arc and reaches temperatures above 2000°C, enabling complete dissociation and formation of reactive H+ and OH- ions
Solution Approach 2:
The steam is preheated to superheated conditions (temperature above 100°C) before injection, and then injected internally where it undergoes immediate dissociation in the high-temperature electric arc, ensuring the plasma plume is formed with high concentration of reactive ions from the outset
2Ease of manufacture
If steam is injected at the tip of the plasma torch, then the system is simpler to operate, but the injected steam will undergo limited or zero dissociation producing a non-reactive plasma plume with poor destruction efficiency
Solution Approach 1:
The steam is preheated to superheated conditions before injection to prevent condensation, and then injected internally where it immediately undergoes complete dissociation in the high-temperature electric arc, ensuring the plasma plume is formed with high concentration of reactive ions from the outset
Solution Approach 2:
The invention changes the temperature parameter of the steam from ambient to superheated (above 100°C) before injection, and utilizes the extreme temperature conditions (above 2000°C) in the electric arc zone to achieve complete dissociation, transforming the steam into a highly reactive plasma medium
3Reliability
If conventional plasma torches with moving parts are used, then electrode ignition can be achieved, but the design becomes complex with moving parts inside the plasma torch assembly
Solution Approach 1:
The invention extracts the moving parts (electrode motion system) from the plasma torch assembly and relocates the ignition function to an external high frequency energy source, simplifying the torch design while maintaining reliable ignition capability through contactless ignition
Solution Approach 2:
The invention replaces the mechanical electrode motion system with a high frequency electromagnetic field-based ignition system, eliminating moving parts from the torch assembly while achieving reliable plasma ignition through contactless energy coupling
4Power
If high power steam plasma torches are developed for industrial applications, then industrial-scale plasma processing becomes possible, but currently available torches are limited to lab-scale with low gross power
Solution Approach 1:
The invention changes the power parameter from lab-scale to industrial-scale (gross power above 100 kW) by optimizing the torch design for high power operation, and simultaneously adjusts the steam injection and plasma generation parameters to maintain efficient chemical conversion at these higher power levels
Solution Approach 2:
The steam is preheated to superheated conditions before injection to ensure it reaches the high-power plasma zone in a gaseous state, enabling efficient energy coupling and chemical conversion at industrial power levels without condensation losses
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 system achieves a highly ionized steam plasma plume with reactive H+ and OH- ions, significantly extending electrode life and preventing condensation, resulting in a high-power steam plasma torch suitable for industrial use with no moving parts and simplified design.
Implementation Method 1
a plasma torch assembly (1), comprising an electrode assembly for igniting the plasma torch assembly
Implementation Method 2
produce a plasma plume with a high concentration of H+ and OH- ions
Implementation Method 3
a steam vortex generator with tangentially drilled holes to create a high-speed gas swirl
Implementation Method 4
a cooling system for the plasma torch assembly
Implementation Method 5
injects superheated steam directly into the plasma plume
Data Source
Figure 1
Figure 2
AI summary
A high power DC steam plasma torch system (S) includes a steam plasma torch assembly (1) wherein superheated steam (46) is used as the main plasma forming gas, thereby resulting in a very reactive steam plasma plume. The superheated steam (46) is injected internally directly into the plasma plume via a ceramic lined steam feed tube (25) for reducing condensation of steam before reaching the plasma plume. The superheated steam (46) flows through a gas vortex (16) which has tangentially drilled holes thereby resulting in a high speed gas swirl that minimizes electrode erosion. In the present steam plasma torch system (S), the plasma torch assembly (1) is ignited using an ignition contactor which is housed external to the plasma torch assembly (1). The superheated steam (46) is injected into the plasma plume using a water cooled steam vortex generator assembly (15).