Fluid Intensifier for Dry Gas Seal Barrier Pressure
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Solution Overview
Problem
Conventional mechanical seal systems face challenges in maintaining adequate barrier fluid pressure and flow, particularly during low-feed operating conditions or equipment startup and shutdown, leading to potential reverse flow of process fluid into the barrier fluid chamber.
Innovation Solution
An improved gas supply system utilizing a pair of mechanically interconnected pneumatic pressure cylinders with a fast-acting 5/2-way solenoid valve and microprocessor-controlled feedback loop, which enhances pressure intensification and fluid control for continuous, pressurized barrier fluid supply to the mechanical seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gas supply systems are used during low-feed operating conditions or startup, then the system is simpler and easier to operate, but adequate barrier fluid pressure and flow cannot be maintained
Solution Approach 1:
The gas supply system transitions from a static conventional setup to a dynamic intensifier system with movable pistons and reciprocating motion. The drive piston and boost piston mechanically interact to dynamically adjust and intensify gas pressure, ensuring adequate barrier fluid pressure is maintained during low-feed conditions and startup while managing system complexity through controlled mechanical motion.
Solution Approach 2:
The invention applies pneumatic principles by using compressed air supplied to the drive piston chamber to generate mechanical motion. The pneumatic pressure drives the reciprocating pistons in the intensifier, converting pneumatic energy into mechanical work that intensifies the barrier fluid pressure, thereby maintaining reliable pressure levels without requiring overly complex mechanical systems.
2Device complexity
If a pneumatic four-way valve is used to control the drive cylinder, then the control system is simpler, but the valve size and air consumption increase
Solution Approach 1:
The control system is segmented into multiple smaller solenoid valves (first and second solenoid valves) that control different aspects of the pneumatic circuit separately. Instead of using one large four-way valve, the system divides the control function into smaller components that can be more efficiently managed, reducing overall air consumption while maintaining control capability.
Solution Approach 2:
The system incorporates feedback mechanisms where the controller monitors the operation of the drive cylinder and adjusts the solenoid valves accordingly. This feedback control allows for optimized air consumption by activating valves only when needed and coordinating their operation to minimize wasted pneumatic energy, thereby reducing total air consumption while maintaining simple control logic.
3Reliability
If the gas supply is turned on continuously during compressor rotation, then adequate barrier fluid pressure is maintained, but energy consumption increases
Solution Approach 1:
The gas supply system operates using periodic reciprocating motion of the drive piston and boost piston instead of continuous gas supply. The intensifier uses cyclic compression and expansion phases where compressed air is supplied periodically to the drive piston chamber, creating oscillating pressure that maintains adequate barrier fluid pressure throughout the cycle while reducing overall energy consumption compared to continuous supply.
Solution Approach 2:
The system recovers and utilizes the elastic potential energy stored in the compressed gas within the intensifier chambers. During the expansion phase, the compressed gas naturally expands to maintain pressure, reducing the need for continuous energy input. The system effectively recovers energy that would otherwise be lost, maintaining reliable barrier fluid pressure while minimizing energy consumption.
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 reliable barrier fluid supply even during low-pressure conditions, reducing leakage and extending system operational life by optimizing air consumption and enabling remote monitoring and programming.
Implementation Method 1
a drive cylinder that affects movement of a boost cylinder wherein the displacement of these mechanically interconnected pistons in the drive cylinder and boost cylinder intensifies the pressure being discharged by the boost cylinder
Implementation Method 2
an improved control valve and operating system therefore which provides advantages over the prior art. In this regard, the invention relates to an intensifier using an improved control valve and operating system therefore which provides advantages over the prior art. In this regard, the invention relates to an intensifier using a fast-acting 5/2-way solenoid valve
Data Source
AI summary
A gas supply system for a mechanical seal turns on the gas supply at a pressurized flow rate at the time of compressor case pressurization and remains on during compressor rotation until pressure is adequate. The gas supply system has an intensifier that includes a pair of mechanically inter-connected pneumatic pressure cylinders which comprise a drive cylinder that affects movement of a boost cylinder wherein the displacement of these mechanically interconnected pistons in the drive cylinder and boost cylinder intensifies the pressure being discharged by the boost cylinder and supplied as a barrier fluid to the mechanical seal. The intensifier uses a control valve and operating system which includes a fast-acting 5/2-way solenoid valve having a feedback loop connected to a control system which includes a microprocessor that controls valve actuation.