Podcast
Questions and Answers
Explain the purpose of the demister pad inside D-520 (Propylene Suction Drum) and why it is located below the vapor outlet.
Explain the purpose of the demister pad inside D-520 (Propylene Suction Drum) and why it is located below the vapor outlet.
The demister pad is designed to remove any entrained liquid from the vapor before it exits the drum. It is placed below the vapor outlet to ensure that the vapor passes through it effectively, separating any liquid droplets.
Describe the function of the sparger located at the bottom of D-520, and explain its role in level control within the drum.
Describe the function of the sparger located at the bottom of D-520, and explain its role in level control within the drum.
The sparger vaporizes liquid propylene using high-pressure propylene. This is used to manage the liquid level in the drum by controlling the amount of liquid present.
In the Propylene Refrigeration System, what is the primary function of C-500 (Propylene Compressor), and how does its design contribute to this function?
In the Propylene Refrigeration System, what is the primary function of C-500 (Propylene Compressor), and how does its design contribute to this function?
C-500's primary function is to compress propylene vapor, increasing its pressure. Its centrifugal design, with a spinning impeller and curved vanes, increases the velocity and energy of the gas.
Describe the flow path of propylene through the refrigeration system, starting from when vaporized propylene leaves the shell side of E-370.
Describe the flow path of propylene through the refrigeration system, starting from when vaporized propylene leaves the shell side of E-370.
Explain why maintaining adequate level control in the drums (D-520, D-500, D-510) is important for the overall efficiency and stability of the propylene refrigeration system.
Explain why maintaining adequate level control in the drums (D-520, D-500, D-510) is important for the overall efficiency and stability of the propylene refrigeration system.
Flashcards
Propylene Refrigeration System
Propylene Refrigeration System
A closed-loop system with low, medium, and high-pressure stages used to condense deethenizer overhead.
D-520 (Propylene Suction Drum)
D-520 (Propylene Suction Drum)
Receives vaporized propylene from E-370 and separates any liquid.
C-500 (Propylene Compressor)
C-500 (Propylene Compressor)
Compresses propylene vapor to a high pressure.
Demister Pad Function
Demister Pad Function
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Sparger Purpose in D-520
Sparger Purpose in D-520
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Study Notes
- The Propylene Refrigeration System is a closed-loop system featuring low, medium, and high-pressure stages.
- It condenses deethenizer overhead in E-370.
- Make-up liquid propylene from EU-1592 goes to D-500 (Propylene Accumulator).
- Vaporized propylene from E-370's shell side travels to D-520.
- Liquid propylene at the bottom of D-520 can be flashed using high-pressure propylene via the sparger.
- Propylene vapor from D-520 moves to C-500 (Propylene Compressor) for compression to a high pressure.
- Compressed propylene vapor goes to E-500 (Propylene Refrigeration Condenser) shell side.
- Cooling water on the tube side of E-500 condenses the compressed propylene vapor.
- Condensed propylene is routed to D-500.
- Non-condensable vapor from D-500 is vented to the Purge Gas Header.
- Medium pressure liquid propylene flows from D-500's bottom to D-510.
- Propylene vapor from D-510 goes to C-500's mid-stage suction.
- Liquid propylene from D-510 is depressurized and sent to E-370's shell side, restarting the cycle.
Equipment Details
- D-520 (Propylene Suction Drum)
- C-500 (Propylene Compressor)
- E-500 (Propylene Refrigeration Condenser)
- D-500 (Propylene Accumulator)
- D-510 (Propylene Interstage Suction Drum)
D-520 (Propylene Suction Drum)
- Dimensions are 4’D x 8’6”L.
- Has an internal demister pad below the top vapor outlet to remove entrained liquid.
- Equipped with a bottom sparger to vaporize liquid for level control.
- Vapor enters the top, liquid exits the bottom, and vapor exits the top.
C-500 (Propylene Compressor)
- It is a two-stage centrifugal compressor driven by an 800 HP induction electric motor.
- Centrifugal compressors increase gas velocity via a spinning impeller.
- Gas flows into a wider channel, slowing down and converting kinetic energy to pressure.
- Volume reduces due to increased pressure.
- It compresses propylene in a closed-loop refrigeration circuit for T-370 overhead cooling.
E-500 (Propylene Refrigeration Condenser)
- It's a shell and tube, U-tube heat exchanger.
- It cools and condenses compressed propylene vapor on the shell side using cooling water on the tube side.
- The purpose is to cool and condense compressed propylene discharge vapor before it reaches D-500.
D-500 (Propylene Accumulator)
- Dimensions are 4’6”D x 16’L.
- Accumulates condensed propylene liquid for letdown to medium pressure in D-510.
- Condensed propylene enters the top, liquid exits the bottom, and non-condensed vapors exit the top.
D-510 (Propylene Interstage Suction Drum)
- Dimensions are 3’D x 11’6”L.
- Has an internal demister pad below the top vapor outlet to remove entrained liquid.
- Propylene liquid and vapor mix enter the top, liquid exits the bottom, and vapor exits the top.
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