Pressure Exchanger Piston Balances End Cover Forces
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Solution Overview
Problem
Hydraulic fracturing equipment faces pressure imbalances across components due to exposure to fluids with differing pressures, leading to deflection and potential mixing of fluids, which affects the efficiency and reliability of pressure transfer systems.
Innovation Solution
Integration of pistons with end covers in a rotary isobaric pressure exchanger creates sealed pressure areas to balance forces, minimizing deflection and preventing fluid mixing, using wear-resistant materials like ceramics in a metal matrix to withstand corrosive and abrasive environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If components are exposed to fluids with differing pressures, then pressure transfer function is achieved, but pressure imbalance causes deflection and potential fluid mixing
Solution Approach 1:
A pressure balancing piston is introduced as an intermediary component between the high-pressure and low-pressure fluid chambers. The piston responds to pressure imbalances by moving to equalize forces on the end cover, preventing excessive deflection that would cause fluid mixing while allowing the pressure transfer function to continue operating.
Solution Approach 2:
The pressure balancing system operates on a feedback mechanism where the piston continuously responds to pressure differential changes. When pressure imbalance causes force asymmetry on the end cover, the piston moves to counteract the imbalance, automatically maintaining fluid separation without external control systems.
2Productivity
If end covers are exposed to pressure differential, then pressure exchange function is performed, but deflection occurs compromising sealing
Solution Approach 1:
The pressure balancing piston acts as a mediator that absorbs and compensates for pressure differential effects on the end cover. By equalizing forces through piston movement, the system maintains end cover alignment and sealing precision while allowing high-pressure exchange operations to proceed at full efficiency.
3Reliability
If pressure balancing system is added, then deflection is reduced and fluid mixing prevented, but device complexity increases
Solution Approach 1:
The pressure balancing piston is integrated directly into the end cover structure, merging two functions (pressure balancing and end cover support) into a single combined component. This integration minimizes additional complexity while achieving reliable fluid separation through the piston's pressure-equalizing action.
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 effectively reduces deflection of end covers and maintains the separation of high and low-pressure fluids, enhancing the efficiency and reliability of pressure transfer in hydraulic fracturing operations by maintaining pressure balance and preventing fluid mixing.
Implementation Method 1
A first piston integral with a first end cover of the rotor creates a sealed off low pressure area to balance the forces on the respective end cover, which minimizes deflection of the respective end cover
Implementation Method 2
using wear-resistant materials like ceramics in a metal matrix to withstand corrosive and abrasive environments
Data Source
AI summary
A system includes a rotary isobaric pressure exchanger (IPX) configured to exchange pressures between a first fluid and second fluid. The rotary IPX includes a first end cover including a first fluid aperture configured to route the first fluid. The rotary IPX also includes a first piston coupled to the first end cover. The first piston includes a first hydraulic path configured to route the first fluid to or from the first fluid aperture.