1 / 32

Function of Reactor Multi-Point Temperature Sensing

Function of Reactor Multi-Point Temperature Sensing. Measure catalyst bed inlet differential temperature (CT) to ensure proper distribution Maintain precise process temperature for optimal conversion

ora
Download Presentation

Function of Reactor Multi-Point Temperature Sensing

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Function of Reactor Multi-Point Temperature Sensing • Measure catalyst bed inlet differential temperature (CT) to ensure proper distribution • Maintain precise process temperature for optimal conversion • Ensure proper quench in conversion reactions similar to hydro-cracking operations and severe hydro-treating units • Indicate temperature excursions in high temperature / high pressure reactors • Protect reactor vessel wall integrity • Protect catalyst integrity

  2. WIKA Multi-Point Designs Cased (Protection Tube) • Bi-metallic/Steel Alloy spring loaded • Heat transfer block • Bi-metallic spring/Steel Alloy spring loaded with support strap • Free-Hanging • With or without guide tubes • Mi Cable primary pressure boundary • Fast response • Design Codes of Conformance • For temperature and pressure: • ASME Section VIII Division 1 for category H fittings • ASME B31.3 Piping Code • For thermocouple integrity and conformance: • ASTM 14.03 Sections E230, E585, E608 & E780

  3. Cased Multi-Point Designs • Options Include: • Pointed tip machined from bar stock • Variety of alloy steels to suit process conditions • Cooling fins to dissipate convected and conducted heat from terminations • Secondary Pressure containment in the event of a primary pressure boundary failure • Individual sensor replacement during production with heat transfer block design (Spring loaded designs involve complete multi-point sensor removal from tube) • Sleeve design allowing for multi-point tube movement without deformation of tube Bi-Metallic Spring Loaded Heat Transfer Block Spring Loaded with Support Strap

  4. Cased Multi-Point With Heat Transfer Blocks and Pointed tip

  5. Cased Multi-Point With Expansion Sleeve and Secondary Pressure Containment

  6. Cased Multi-Point With Mechanical Reinforcement Attachments

  7. Cased Multi-Point With Mechanical Support Tube, Vented for Fast Response Including Secondary Pressure Containment

  8. Cased Multi-Point With Cooling Fins and Pointed Tip, External to Protection Tube for Faster Response to Temperature Changes

  9. Free-Hanging Multi-Point Designs • Flexible for longitudinal & cross sectional temperature measurement • Options include: • Close coupled or remote mounted terminations • Heavy or double-wall MI Cable for extra resistance • to process medium • Secondary pressure containment • Top or side mount

  10. Free-Hanging Multi-Point With Secondary Pressure Containment with Visual Indication

  11. Free-Hanging Multi-Point With Secondary Pressure Containment with Block & Bleed Includes reducing adaptor to suit vessel nozzle

  12. Free-Hanging Multi-Point With Angled Secondary Pressure Containment Designed for top or side mounting where space restrictions apply.

  13. Free-Hanging Multi-Point With Guide Tubes for Extra Mechanical/Corrosion Protection

  14. Free-Hanging Multi-Point Thermocouple Advantages • Reduces the number of external skin thermocouples • Resistance to extensive pressure build-up in hydro-cracking applications • Fast response • Multiple locations • Mirror image thermocouple patterns allow operator to see channelling, coke balls or improper temperature distribution • Optional secondary pressure containment • Greater number of thermocouples for multi-point assembly reduces number of nozzles required for identical number of sensing points

  15. Mineral Insulated (MI) Cable for Free-Hanging Multi-Point Designs • Multiple MI cable sizes available to meet application requirements • 0.236″ (6 mm) – greatest number of thermocouples through a single flange • 5/16″ (7.5 mm) – industry standard for free-hanging design • 3/8″ (10 mm) – for most severe service when reliability is a premium • Variety of other diameters available upon request • Available in various alloys to meet the specifications of the reactor process • Special tools not required for large radius bends • Tube-bending tool advisable for final 90 degree bend • and any other tight radius bending required Thermocouple with 90° Bend

  16. Mineral Insulated (MI) Cable Sheath & Conductors • Standard wall 0.040″ (1.0 mm) • Reactor heavy wall 0.050″ (1.3 mm) sheath with 16 AWG conductors also available • Optional double-wall sheath available for additional safety, durability and reliability • Standard 0.040″ (1.0 mm) wall thickness with a second 0.040″ (1.0 mm) sheath Standard Wall Heavy Wall Double Wall

  17. Free-Hanging Multi-Point Design Features • Pressure Feed-Through Sleeve Design • Eliminates localized heat build-up during welding process preventing distortion of fittings • Heat transferred away from thermocouple sheath during welding procedure • Eliminates possible damage through overheating to MI cable sheath during construction of assembly

  18. Free-Hanging Multi-Point Design Features • Secondary Pressure Containment • Secondary Pressure Containment engineered to suppress process in unlikely event of primary pressure boundary failure • Indication provided to operator regarding breech either AROUND or THROUGH the Mineral Insulated (MI) cable sheath • Optional WIKA pressure gauge/transmitter for visible identification on containment chamber • Optional double-flange design allows for access to safety containment chamber during reactor shutdowns

  19. Safety • Features Include: • Eliminates exposure risk • Process fluids unable to migrate to junction box • Block & Bleed valve designed to bleed-off trapped hydrogen or process fluids • Compromised thermocouples do not require capping with a pressure fitting • Localized indication of primary pressure boundary failure

  20. Junction Box • Features Include: • Stainless steel, weatherproof/corrosion resistant • Direct or remote mounted • Easy access to terminals or transmitters • All thermocouple terminal connections individually identified • Cable entry connection to suit customer requirements • Available as explosion proof (EExd) or general purpose (NEMA/IP Rating) • Other materials available including cast steel and cast aluminum • Terminal strips or din rail mounting options available

  21. Reactor Design Considerations with Free-Hanging Style Multi-points • Fewer penetrations into the reactor vessel for thermometry • Fewer nozzles translates into reduced thermometry expense • Ease of vessel design • Greater structural integrity of the vessel • Nozzles can be top or side mounted to the vessel • Superior process information for enhanced design operations • Reduced exposure risk

  22. Measurement Design Considerations with Free-Hanging Style Multi-points • Significant increase of thermocouple points results in a lower cost than using traditional cased style designs • Total number of thermocouple points determined by nozzle size and thermocouple diameter • All designs and thermocouple locations are reviewed with the customer to ensure optimum efficiency

  23. Testing of Multi-Points • Include: • Pressure testing (hydrostatic & pneumatic) up to 10,000 psi • Liquid penetrant inspection (LPI) • Positive Material Identification (PMI) • Radiography (RT) • Ultrasonic (UT) • Sensor calibration

  24. Installation • Designed to be routed around the inner circumference of the vessel, then projected inward to the sensing positions • Reduces both channelling effects and interference with nozzle flow patterns • Base support • Hanging support (sidewall bracket)

  25. Sensor Routing Example

  26. Free-Hanging Multi-Point Support Bracket

  27. Base Support Structure Example

  28. Reactor Vessel - Typical Point Locations

  29. Reactor Vessel – Typical Routing and attachment with Expansion Loop

  30. North American Sales Offices Deer Park, TX Tel: (713) 475-0022 Fax: (713) 475-0011 Edmonton, AB* (Head Office) Tel: (780) 463-7035 Fax: (780) 462-0017 Calgary, AB Tel: (403) 237-5960 Fax: (403) 264-0095 Burnaby, BC Tel: (604) 299-3855 Fax: (604) 299-4566 Montreal, QC Tel: (514) 332-0330 Fax: (514) 332-4292 Fort McMurray, AB Tel: (780) 791-9995 Fax: (780) 743-2296 Oakville, ON Tel: (905) 337-1611 Fax: (905) 337-2716 Quebec City, QC Tel: (418) 952-7779 Fax: (514) 332-4292 Saskatoon, SK Tel: (306) 664-1105 Fax: (306) 244-4084 Grande Prairie, AB Tel: (780) 357-0386 Fax: (780) 357-0389 Sarnia, ON Tel: (519) 344-1339 Fax: (519) 344-3824 Website:www.wika.comEmail:infoUSA@wika.com * WIKA flexible multi-point manufacturing facilities

More Related