Pressure exchange system with motor system and pressure compensation system

A system, comprising:

• a rotary isobaric pressure exchanger (IPX) configured to exchange pressures between a first fluid and a second fluid, wherein the rotary IPX comprises a first casing and a rotor disposed in the first casing;
• a motor system configured to power the rotary IPX, wherein the motor system comprises a second casing, a motor disposed in the second casing, and a dielectric fluid disposed in the second casing;
• a shaft coupling the motor and the rotor;
• a shaft seal disposed about the shaft, wherein the shaft seal is configured to separate the first fluid and the dielectric fluid;
• a pressure compensator configured to reduce a pressure differential across the shaft seal, wherein the pressure compensator comprises:
• a first chamber configured to receive the first fluid at a first pressure;
• a second chamber configured to receive the dielectric fluid at a second pressure;
• and
• a hydraulic barrier disposed between the first and second chambers, wherein the hydraulic barrier is configured to separate the first fluid in the first chamber and the dielectric fluid in the second chamber and configured to balance the first pressure of the first fluid and the second pressure of the dielectric fluid;
• and
• a fluid passageway in hydraulic communication with the dielectric fluid disposed in the second casing of the motor system and the second chamber, wherein the second fluid passageway directly supplies the dielectric fluid to the second chamber from an interior of the second casing.

A system, comprising:

• a rotary isobaric pressure exchanger (IPX) configured to exchange pressures between a first fluid and a second fluid, wherein the rotary IPX comprises a first casing and a rotor disposed in the first casing;
• a motor system configured to power the rotary IPX, wherein the motor system comprises a second casing, a motor disposed in the second casing, and a dielectric fluid disposed in the second casing;
• a shaft coupling the motor and the rotor;
• a shaft seal disposed about the shaft, wherein the shaft seal comprises a first face configured to contact the first fluid and a second face configured to contact the dielectric fluid, and wherein the shaft seal is configured to block leakage of the first fluid into the motor system;
• a pressure compensator configured to reduce a pressure differential across the first and second faces of the shaft seal, wherein the pressure compensator comprises:
• a first chamber configured to receive the first fluid at a first pressure;
• a second chamber configured to receive the dielectric fluid at a second pressure, wherein the second pressure is greater than the first pressure;
• and
• a hydraulic barrier disposed between the first and second chambers, wherein the hydraulic barrier is configured to separate the first fluid in the first chamber and the dielectric fluid in the second chamber and configured to balance the first pressure of the first fluid and the second pressure of the dielectric fluid;
• a first fluid passageway in hydraulic communication with the first fluid disposed in first casing of the rotary IPX and the first chamber;
• and
• a second fluid passageway in hydraulic communication with the dielectric fluid disposed in the second casing of the motor system and the second chamber, wherein the second fluid passageway directly supplies the dielectric fluid to the second chamber from an interior of the second casing.