Reciprocating Piston Pressure Packing for Process-Gas Containment
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Solution Overview
Problem
Existing reciprocating piston compressors experience process gas leakage due to dynamic pressure changes in the vent line, leading to incorrect buffer gas pressure regulation and increased emissions, especially when using toxic, hazardous, or explosive gases, which poses safety and operational risks.
Innovation Solution
A sensing line is connected to the vent volume in the pressure packing, with its opposite end closed to prevent gas flow, and used as pilot pressure for a pressure regulator to maintain a constant buffer gas pressure, eliminating pressure drops and ensuring effective gas containment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vent line is used to carry process gas leakage away from the pressure packing, then gas containment is improved, but pressure drops in the vent line cause incorrect buffer gas pressure regulation leading to increased emissions
Solution Approach 1:
The system is segmented into two separate lines: a vent line for carrying away process gas leakage and a sensing line for pressure regulation. This segmentation allows the sensing line to provide accurate pressure feedback without being affected by pressure drops in the vent line, thus resolving the contradiction between gas containment and emission control.
Solution Approach 2:
The sensing line acts as an intermediary between the vent volume and the pressure regulator. It transmits pressure information from the vent volume to the pressure regulator without being part of the gas flow path, eliminating the conflict between gas removal and pressure measurement accuracy.
2Reliability
If buffer gas pressure is increased to prevent process gas leakage, then sealing effectiveness is improved, but the risk of buffer gas mixing with process gas in the vent line increases
Solution Approach 1:
The system separates the buffer gas supply function from the process gas venting function into distinct lines. The sensing line, being closed at the end, prevents buffer gas from mixing with process gas while still allowing accurate pressure regulation of the buffer gas to maintain sealing effectiveness.
3Measurement precision
If a sensing line is added to provide accurate pressure feedback, then pressure regulation accuracy is improved, but device complexity increases
Solution Approach 1:
The sensing line serves as a simple intermediary component that provides accurate pressure feedback to the pressure regulator without requiring complex additional systems. It is a straightforward pressure transmission line that is closed at the end, minimizing complexity while achieving precise pressure control.
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 ensures accurate buffer gas pressure regulation, reducing gas leakage and emissions, minimizing operational risks, and eliminating the need for liquid gas separators, thereby simplifying the system and reducing costs.
Implementation Method 1
A sensing line is connected to the vent volume in the pressure packing, with its opposite end closed to prevent gas flow, and used as pilot pressure for a pressure regulator to maintain a constant buffer gas pressure
Implementation Method 2
a buffer gas barrier at a low-pressure side of the pressure packing... during operation of the pressure packing, a buffer gas with buffer gas pressure is supplied into the buffer gas volume via the buffer gas feeding line with the buffer gas pressure being higher than the vent pressure in the vent volume
Data Source
AI summary
For a pressure packing with a buffer gas barrier into which a buffer gas is fed via a buffer gas feeding line, a sensing line is provided that is connected at a first end to a vent volume in the pressure packing with an opposite second end of the sensing line being closed, so that there is no gas flow in the sensing line. A pressure regulator is connected to the buffer gas feeding line for setting the buffer gas pressure in the buffer gas feeding line, whereas, during operation of the pressure packing, the pressure in the sensing line is used as pilot pressure for the pressure regulator for setting the buffer gas pressure.