Electrode Plasma PFC Decomposition Apparatus
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Solution Overview
Problem
Current methods for decomposing perfluorinated compounds (PFCs) in semiconductor manufacturing are inefficient and costly due to high energy consumption, equipment requirements, and maintenance needs, particularly in high-temperature thermal plasma techniques and low-temperature plasma methods that convert PFCs into solid waste particles.
Innovation Solution
An apparatus integrated into a gas exhaust duct that applies electrical energy using high-voltage, high-frequency waves to induce electron beams and plasma oscillations, effectively decomposing PFCs into compounds like water or carbon dioxide, which can be further processed in a wet scrubber, with a design featuring an external electrode unit and an internal electrode unit with implanter poles for efficient energy distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature thermal plasma technique is used to decompose PFCs, then decomposition effectiveness is improved, but energy consumption increases significantly
Solution Approach 1:
The invention changes the operating parameters from high-temperature thermal plasma to low-temperature plasma at atmospheric pressure, achieving effective PFC decomposition without the need for high temperatures. This parameter change resolves the contradiction by maintaining decomposition effectiveness while dramatically reducing energy consumption.
Solution Approach 2:
The invention replaces the thermal mechanism (high-temperature heating) with an electrical mechanism (electrode-based plasma generation). By using electrodes to generate plasma directly in the exhaust stream, the system achieves decomposition without requiring thermal heating, thus reducing energy consumption while maintaining effectiveness.
2Reliability
If low-temperature plasma method with alkaline earth metals is used to convert PFCs into solid waste particles, then decomposition is achieved, but device complexity and maintenance costs increase
Solution Approach 1:
The invention extracts and eliminates the need for alkaline earth metal additives and associated solid waste handling equipment. By using pure electrode-based plasma decomposition, the system converts PFCs directly into gaseous products (CO2, H2O, HF) without generating solid waste particles, thereby simplifying the device and reducing maintenance requirements.
Solution Approach 2:
The invention converts the harmful PFC gases directly into benign gaseous products (CO2, H2O, HF) through plasma decomposition, eliminating the need to handle solid waste particles. This approach transforms a potentially harmful process (generating solid waste) into a beneficial one (direct gas-to-gas conversion), simplifying the overall system.
3Reliability
If conventional PFC processing equipment is used independently, then decomposition function is provided, but system size and maintenance management functions increase
Solution Approach 1:
The invention merges the PFC decomposition function directly into the existing exhaust duct system by installing electrodes within the duct. This integration eliminates the need for separate, independent processing equipment, reducing system size and simplifying maintenance management while maintaining full decomposition capability.
Solution Approach 2:
The electrode-based plasma generator serves multiple functions: it decomposes PFCs, handles the exhaust stream directly, and integrates with existing ductwork. This multi-functionality reduces the need for dedicated equipment, thereby reducing overall system size and complexity while maintaining reliable PFC processing.
4Reliability
If high-temperature combustion method is used to decompose PFCs, then decomposition effectiveness is improved, but throughput and performance relative to cost input decrease
Solution Approach 1:
The invention replaces thermal combustion with electrical plasma generation, achieving decomposition without high-temperature heating. This substitution reduces energy costs significantly while maintaining decomposition effectiveness, thereby improving throughput relative to cost input.
Solution Approach 2:
The electrode-based plasma system operates continuously on the exhaust stream as it flows through the duct, providing constant decomposition without interruption for heating cycles or temperature management. This continuous operation improves throughput efficiency while reducing energy costs compared to batch high-temperature combustion processes.
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 solution enables high-throughput decomposition of PFCs with reduced energy consumption and maintenance costs, achieving processing efficiencies of 90% or greater for various PFC gases, as demonstrated by performance tests.
Implementation Method 1
a voltage supply unit which applies an alternating voltage to the internal electrode unit of sufficient voltage and frequency to generate an electron beam within the reaction space which is capable of decomposing the PFCs
Implementation Method 2
an electron beam and plasma oscillations are induced by high-voltage application of high-density, high frequency waves across an entire path of PFC gas
Data Source
AI summary
The apparatus for decomposing PFCs includes an external electrode unit which is coupled to a reference voltage and which defines a flow space for the flow of the PFCs, and an internal electrode unit which is located within the flow space of the external electrode unit so as to define a reaction space between the internal electrode unit and the external electrode unit. The apparatus is also equipped with a voltage supply unit which applies an alternating voltage to the internal electrode unit which is of sufficient voltage and frequency to generate an electron beam within the reaction space which is capable of decomposing the PFCs.