Exhaust Gas Processing Apparatus with Liquid Film Detoxification
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Solution Overview
Problem
Conventional exhaust gas processing systems face issues with clogging and reduced efficiency due to the accumulation of foreign substances in piping and detoxifying apparatuses, particularly when dealing with toxic gases like silane and halogen-based gases, which require frequent maintenance and risk of ignition from static electricity.
Innovation Solution
An exhaust gas processing apparatus is designed with a suction casing and liquid tank configuration where the processing gas is exposed to a liquid film, using spray nozzles to distribute the liquid and prevent accumulation, and a cartridge heater to maintain high temperatures, reducing clogging and maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a filter or trap is used for foreign substance removal, then the structure is simple, but regular maintenance and replacement are required
Solution Approach 1:
The system uses the vacuum pump's own suction force to circulate liquid through the piping, creating a self-cleaning mechanism that removes foreign substances without external intervention. The liquid circulation is driven by the pressure differential already present in the vacuum system, making the maintenance function self-service.
Solution Approach 2:
The liquid circulation and foreign substance removal operates continuously during vacuum pump operation, rather than requiring periodic shutdowns for maintenance. The useful action of liquid circulation serves dual purposes: maintaining the vacuum environment and continuously cleaning the piping system.
2Reliability
If the piping is heated to high temperature to prevent foreign substance accumulation, then accumulation is prevented, but energy consumption increases and liquid supply areas may cool down
Solution Approach 1:
The system uses liquid circulation (hydraulics) to prevent foreign substance accumulation instead of thermal heating. The liquid flow mechanically removes condensable products and reaction byproducts from the piping walls through shear force and flushing action, eliminating the need for high-temperature heating.
Solution Approach 2:
The approach changes the parameter used for prevention from temperature (thermal parameter) to liquid flow rate (hydraulic parameter). By adjusting liquid circulation parameters rather than temperature, the system achieves the same prevention goal with different physical mechanisms.
3Reliability
If a wet wall is formed in the piping to remove foreign substances, then foreign substances are trapped, but products accumulate on upstream sides and in liquid supply portions
Solution Approach 1:
Instead of forming a wet wall that allows foreign substances to accumulate on surfaces, the system uses liquid circulation to actively flush and remove foreign substances from the piping. The liquid flow direction and force are oriented to prevent deposition rather than allow trapping, inverting the conventional wet wall approach.
Solution Approach 2:
The system extracts foreign substances from the gas phase and removes them through the liquid circulation system before they can accumulate or react. By continuously extracting and transporting foreign substances away from critical areas, the system prevents the formation of harmful reaction products.
4Reliability
If a scraper is used to remove foreign substances near liquid supply areas, then foreign substances are removed, but static electricity friction may cause ignition
Solution Approach 1:
The system replaces mechanical scrapers with liquid circulation for foreign substance removal. The liquid flow provides mechanical cleaning action through hydrodynamic forces without the friction and static electricity generation associated with mechanical scrapers contacting the piping surfaces.
Solution Approach 2:
The liquid acts as an intermediary medium between the foreign substances and the piping system. Instead of direct mechanical contact between scrapers and foreign substances that generates static electricity, the liquid mediates the removal process through hydrodynamic forces, eliminating the ignition risk.
5Reliability
If the outlet of the suction casing is placed below the liquid surface, then foreign substance accumulation is prevented, but pressure loss increases and processing speed decreases
Solution Approach 1:
The system adds the dimension of liquid circulation flow to the outlet area, creating a dynamic cleaning environment rather than a static submersion arrangement. The liquid flow in the circulation path provides continuous cleaning without requiring the outlet to be positioned below the liquid surface, thus maintaining pressure characteristics.
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 apparatus effectively detoxifies processing gases by preventing foreign substance accumulation and reducing maintenance needs, enhancing processing efficiency and safety by minimizing static ignition risks.
Implementation Method 1
a detoxifying apparatus configured to detoxify the gas sucked under vacuum by causing the gas to be exposed to or come into contact with a liquid
Implementation Method 2
a heater embedded inside of a wall portion above a liquid film forming portion provided to form a liquid film on an inner wall surface of a suction casing... heats the suction casing up to the periphery of the inner wall surface where the liquid film is formed
Data Source
AI summary
There is provided an exhaust gas processing apparatus configured to cause a processing gas to be exposed to or come into contact with a liquid and thereby detoxify the processing gas. The exhaust gas processing apparatus comprises a suction casing provided with an inlet which the processing gas is sucked into and with an outlet which the processing gas is flowed out from; a liquid tank configured to receive an outlet-side part of the suction casing and store the liquid therein; and one or multiple spray nozzles placed in the liquid tank. The outlet of the suction casing is arranged to be located above a liquid surface of the liquid stored in the liquid tank. The one or multiple spray nozzles are configured to spray the liquid from around the outlet of the suction casing to a peripheral part of the outlet.