Overview of Environmental Regulations
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Questions and Answers

Where does the sour gas stream used in the HDS Stripper Contactor originate from?

  • The Fuel Gas Header
  • The #2 HDS and #3 HDS Stripper Overhead Accumulators (correct)
  • The Amine Regeneration Unit (ARU)
  • The Amine Settler (5PV-1615)

    • What is the primary purpose of the Amine Settler (5PV-1615) in the Amine Regeneration System?

  • To absorb carbon dioxide from the sour gas stream
  • To separate rich amine from slop oil (correct)
  • To remove hydrogen sulfide from the fuel gas stream
  • To regenerate the amine solution

    • What is the main purpose of the Amine Regeneration Unit (ARU)?

  • To produce methyldiethanolamine (MDEA)
  • To separate rich amine from slop oil
  • To provide sweetened fuel gas to the refinery
  • To remove hydrogen sulfide and carbon dioxide from fuel gas streams (correct)

    • What is the role of the Amine Settling Tank (5PV-2244)?

    <p>To separate rich amine from slop oil (D)</p> Signup and view all the answers

    Which of the following is NOT a component in the Amine Regeneration Unit (ARU) 1/2?

    <p>Sour Gas Header (A)</p> Signup and view all the answers

    Why is the Amine Absorption technology used in the HDS Stripper Contactor Subsystem?

    <p>To remove acid gases, like hydrogen sulfide, from fuel gas (C)</p> Signup and view all the answers

    Which component serves as the primary point of contact for the dilute MDEA solution and the sour gas stream?

    <p>HDS Stripper Contactor (C)</p> Signup and view all the answers

    What is the primary purpose of the Skimmer Pump (5P-146) in the Amine Settler?

    <p>To pump skimmed oil from the settler to the Rich Amine Settling Tank (C)</p> Signup and view all the answers

    What is the primary purpose of the Fuel Gas Contactor (5PV-1604) in the system?

    <p>To remove hydrogen sulfide and other acid gases from the sour gas stream (D)</p> Signup and view all the answers

    What is the primary function of the #1 ARU Amine Filter East/West (5PV-2291/2292)?

    <p>To remove impurities from the lean amine (C)</p> Signup and view all the answers

    What is the name of the amine stream that contains hydrogen sulfide after absorption from the sour gas?

    <p>Rich Amine (B)</p> Signup and view all the answers

    Where is the Sour Release Gas from the LEF Overhead Accumulator (5PV-1679) typically routed?

    <p>To the Fluid Catalytic Cracking Unit (FCCU) (D)</p> Signup and view all the answers

    What is the primary source of the sweetened fuel gas that exits the top of the Medium Pressure Fuel Gas Contactor (5PV-2243)?

    <p>The Gas Recovery Unit (GRU) (C), The #1 - #3 HDS Units (A), The Fluid Catalytic Cracking Unit (FCCU) (B)</p> Signup and view all the answers

    Which of the following pumps is used to combine the rich amine streams from the Fuel Gas Contactors and the HDS Stripper Contactor?

    <p>Stripper Contactor Bottoms Pump East/West (5P-111/112) (B)</p> Signup and view all the answers

    What is the name given to the constituent in the sour gas stream that is absorbed by the lean amine?

    <p>Solute (A)</p> Signup and view all the answers

    Which of the following units does NOT contribute to the sour gas feed to the Fuel Gas Contactor (5PV-1604)?

    <p>Amine Regeneration System (D)</p> Signup and view all the answers

    What is the primary purpose of the Skimmer Pump (5P-146) in the Fuel Gas Contactors Subsystem?

    <p>To remove hydrocarbon from the Amine Settler (5PV-1615/2248) (D)</p> Signup and view all the answers

    What is the main purpose of nitrogen in the Fuel Gas Contactors Subsystem?

    <p>To pressurize the Rich Amine Settling Tank (5PV-2244) to push amine or hydrocarbon (C)</p> Signup and view all the answers

    Which of the following statements best describes the concept of 'slop oil' in the Fuel Gas Contactors Subsystem?

    <p>A mix of hydrocarbons, water, and rich amine that is separated from the settling tank (C)</p> Signup and view all the answers

    What is the purpose of the Amine Regeneration Unit (ARU) in the Fuel Gas Contactors Subsystem?

    <p>To remove acid gases like H2S and CO2 from the lean amine (B)</p> Signup and view all the answers

    What is the purpose of the Absorber in the Fuel Gas Contactors Subsystem?

    <p>To remove the majority of the toxic hydrogen sulfide from the sour gas by absorbing it into the lean amine (D)</p> Signup and view all the answers

    Why is MDEA used as the solvent in the Fuel Gas Contactors Subsystem?

    <p>Because it has a higher affinity for H2S over CO2, allowing some CO2 to slip through the column (B)</p> Signup and view all the answers

    How does lean amine become rich amine in the Fuel Gas Contactors Subsystem?

    <p>By absorbing H2S and some CO2 from the sour gas in the Absorber (C)</p> Signup and view all the answers

    What is the primary function of the HDS Stripper Contactor in the Fuel Gas Contactors Subsystem?

    <p>To remove H2S from the lean amine solution (A)</p> Signup and view all the answers

    Study Notes

    Overview of Environmental Regulations

    • Environmental regulations limit the amount of hydrogen sulfide (H2S) in fuel gas at the refinery.
    • The Amine Regeneration Unit (ARU) #1/#2 uses methyldiethanolamine (MDEA) to remove acid gases (H2S and CO2) from fuel gas streams.
    • The process regenerates and reuses the amine.

    Gas Contacting System

    • The Gas Contacting System in the ARU #1/#2 receives sour gas from several sources.
    • It employs amine absorption technology in three parallel contactors to remove H2S and some CO2 from the gas streams.
    • Lean MDEA solution absorbs H2S from the gas, creating "rich amine."

    Sweetened Fuel Gas

    • Sweetened fuel gas, free from H2S, is sent to the Fuel Gas Header.
    • Rich amine is sent to the ARU #1/#2 or ARU #3/#4 to be regenerated.

    HDS Stripper Contactor Subsystem

    • This subsystem receives sour gas from the HDS Separation and Stripping System.
    • It uses amine absorption technology to remove acid gases like H2S and CO2.

    Rich Amine Settling Tank (5PV-2244)

    • This tank separates rich amine from slop oil.
    • Slop oil floats on top of the rich amine.
    • Nitrogen is used to push amine or hydrocarbons to their respective locations or to relieve pressure.

    Medium Pressure Fuel Gas Contactor (5PV-2243)

    • This contactor removes acid gases from sour gas streams.
    • It uses amine absorption technology.
    • Sour gas comes from various units including the Alky Unit, HDS units, Hydrocracker Unit, and Straight Run Gas Recovery.
    • It has a 20-tray absorption tower.

    Fuel Gas Contactors Subsystem

    • This subsystem receives sour gas from the Sour Gas Header to remove H2S.
    • It employs two parallel contactors using amine absorption technology.
    • Lean amine is used.
    • It is a component of the larger system to remove H2S.

    Additional Information

    • Sour gas contains H2S and CO2 and comes from several units.
    • Rich amine from the #3 HDS Absorber can be routed.
    • The Fuel Gas Contactors can also receive lean amine from the Amine Regeneration Unit.
    • H2S removal is essential for compliance with environmental regulations.

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    Related Documents

    Sinclair ARU 1 Gas Contacting System Module C PDF

    Description

    This quiz covers essential information about environmental regulations, particularly focusing on hydrogen sulfide (H2S) limits in fuel gas at refineries. It also explores the functionality of the Amine Regeneration Unit (ARU) and the processes involved in gas contacting and sweetening. Test your understanding of these critical concepts!

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