Hydrogen Gas Purity Maintainer for Dynamo-Electric Machine
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Solution Overview
Problem
The purity of hydrogen gas in dynamo-electric machines is degraded due to mist formation of sealing oil in the continuous scavenging system, leading to errors in flow rate control and gauge displays, which impede proper scavenging operations.
Innovation Solution
A dynamo-electric machine design that includes an expansion tank, a mist collecting section, a valve unit, a drain pot, and an instrument panel, where the mist collecting section is positioned to prevent mist from reaching the valve unit and instrument panel, ensuring the mist flows back to the expansion tank, thereby maintaining hydrogen gas purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous scavenging system is used to maintain hydrogen gas purity, then the purity of hydrogen gas is maintained, but sealing oil mist accumulates in the piping and instrumentation causing measurement errors and control failures
Solution Approach 1:
A mist separator is introduced as an intermediary component in the scavenging piping system. This separator intercepts and removes sealing oil mist from the gas flow before it reaches the needle valve and instrumentation, preventing accumulation that would cause measurement errors while maintaining the continuous scavenging operation
Solution Approach 2:
The harmful sealing oil mist is extracted and removed from the scavenging gas stream using the mist separator. By taking out the contaminant (mist) from the system, the purity of the hydrogen gas is maintained while preventing mist accumulation in critical components like the needle valve and gauges
2Extent of automation
If the needle valve and gauges are placed in the scavenging piping for monitoring, then continuous monitoring of scavenging flow rate and gas purity is enabled, but sealing oil mist easily accumulates in these components causing operational errors
Solution Approach 1:
The mist separator serves as a protective intermediary placed between the scavenging system and the instrumentation (needle valve and gauges). It prevents sealing oil mist from reaching these sensitive components, ensuring they remain free from accumulation that would compromise their operational reliability
Solution Approach 2:
The mist separator performs preliminary removal of sealing oil mist from the gas stream before the gas reaches the needle valve and gauges. This preliminary action prevents mist accumulation in advance, ensuring the instrumentation remains functional and reliable throughout operation
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
Prevents mist accumulation in the valve unit and instrument panel, preventing malfunctions and ensuring accurate monitoring and scavenging operations, thereby maintaining hydrogen gas purity.
Implementation Method 1
part of the sealing oil becomes mist having a fine particle size, and is mixed in the scavenged coolant gas
Implementation Method 2
the mist of the sealing oil adheres in the middle of the piping which transports the coolant gas, and returns to a liquid
Data Source
AI summary
According to one embodiment, a dynamo-electric machine includes a rotor, a stator, a frame, a shaft sealing device, and a gas purity maintainer. The gas purity maintainer includes an expansion tank, a first mist collecting section, a valve unit, a drain pot, and an instrument panel. The first mist collecting section is provided in the middle of a scavenging pipe extending from the expansion tank to discharge a coolant gas from the expansion tank. A downstream in the first mist collecting section is higher than an upstream.