Pulverized Fuel Operations: RIHAND Document Insights
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Questions and Answers

What is the primary focus of the document RIHAND-LMI-OD-OPS-SYST-009?

  • The safe operation and maintenance of pulverised fuel plants (correct)
  • The financial analysis of pulverised fuel operations
  • The environmental impact assessment of pulverised fuel usage
  • The installation process of pulverised fuel plants

    • Which of the following is mentioned as an important aspect of the pulverised fuel operation?

  • The development of an explosive mixture (correct)
  • Cost reduction strategies
  • Supplier relationship management
  • Energy consumption management

    • What type of document is RIHAND-LMI-OD-OPS-SYST-009 classified as?

  • A procedure document
  • A safety guideline (correct)
  • A training manual
  • A maintenance checklist

    • What is one of the key elements to be included in the instruction and training regarding pulverised fuel?

    <p>Proper handling of sources of ignition</p> Signup and view all the answers

    Which of the following is NOT listed in the index of the document?

    <p>Risk assessment method</p> Signup and view all the answers

    What is the design capacity of the PF Mill with the given specifications?

    <p>68 MT/hr</p> Signup and view all the answers

    What type of feeder is mentioned for the PF Mill?

    <p>Belt type gravimetric feeder</p> Signup and view all the answers

    What criterion is NOT mentioned as a potential cause for pulverized fuel explosions?

    <p>Careless handling of raw coal</p> Signup and view all the answers

    What is the maximum capacity range of the gravimetric feeder mentioned?

    <p>82 T/Hr</p> Signup and view all the answers

    Which specific aspect concerning safety is highlighted in relation to P.F. handling?

    <p>Careless cleaning of P.F. deposits</p> Signup and view all the answers

    What is the HGI value of the raw coal for the minimum design capacity in the PF Mill?

    <p>55 HGI</p> Signup and view all the answers

    Which manufacturer's equipment is referenced in the PF Mill and RC Feeders?

    <p>BHEL</p> Signup and view all the answers

    What air to fuel ratio indicates that an explosion cannot be sustained?

    <p>5/1</p> Signup and view all the answers

    What is one cause of explosive mixtures in milling systems?

    <p>Manual control of air and/or fuel supply</p> Signup and view all the answers

    Where is it most likely for coal to ignite and produce coal gas leading to an explosion?

    <p>Coal bunker outlet/feeder area</p> Signup and view all the answers

    Which situation can lead to an accumulation of an explosive mixture in the boiler furnace?

    <p>Complete loss of ignition</p> Signup and view all the answers

    What typically precedes a complete loss of ignition?

    <p>Deteriorating combustion conditions</p> Signup and view all the answers

    What is a potential consequence of partial loss of ignition during operation?

    <p>Unstable combustion and damages upon re-ignition</p> Signup and view all the answers

    What limits the mill outlet temperature in a pulverized fuel system?

    <p>Mechanical considerations</p> Signup and view all the answers

    What happens if uncooled deposits of coal are allowed to remain in a mill system?

    <p>They are likely to catch fire eventually.</p> Signup and view all the answers

    What element is crucial for an explosive mixture to form?

    <p>Presence of ignition source</p> Signup and view all the answers

    What condition might prevent the milling system from being put into service?

    <p>Suspected fire in any part</p> Signup and view all the answers

    What is the minimum velocity in the P.F. pipes on a running mill required to minimize fuel deposition?

    <p>15 m/s</p> Signup and view all the answers

    When are personnel allowed in the vicinity of the P.F. plant?

    <p>Only under controlled conditions during unstable situations</p> Signup and view all the answers

    What should be established to ensure abnormalities in the milling system are communicated promptly?

    <p>A clear line of command and communication</p> Signup and view all the answers

    What action should be taken following an indication of over pressurization in a P.F. system?

    <p>Treat the system as containing an ignition source</p> Signup and view all the answers

    What temperature management guideline applies to a running mill's outlet temperature?

    <p>Depends on coal nature and mill design</p> Signup and view all the answers

    What is the purpose of maintaining design features like mill fire detectors in a P.F. plant?

    <p>To protect against fires and explosions</p> Signup and view all the answers

    What is crucial to note during the operation of a standing mill?

    <p>Keep the mill body temperature as low as practicable</p> Signup and view all the answers

    What should happen during a partial or complete loss of ignition in the milling process?

    <p>Shutdown should be immediate</p> Signup and view all the answers

    Study Notes

    Location Management Instructions for Pulverized Fuel Plant

    • Document title: The Safe Operation and Maintenance of Pulverised Fuel Plant
    • Document name: RIHAND-LMI-OD-OPS-SYST-009
    • Revision: 04, August 2022
    • Review date: 02.12.2024
    • Approved for implementation by: HOP (Rihand)

    Index

    • Document includes an index with page numbers for each topic
    • Topics include introduction, superseded documents, reference documents, records of revision, scope, discussion and background information, the development of an explosive mixture, sources of ignition, instructions and training of plant staff, principles involved in safe operation and maintenance, operational procedures, fires in milling systems, actions in a mill system containing a fire, putting a mill system into service, taking a mill system out of service, coal flow failure, furnace precautions, burner management system (BMS)/FSSS, bunkers, boiler ash and dust hoppers, responsibility, review, distribution list, LMI checklist, and annexure

    Introduction

    • Ignition of finely divided combustible materials in suspension can cause significant explosions and emissions of flame, classified as dangerous
    • All dusts, whether hot or cold, are considered dangerous
    • Essential for personnel awareness of risks involved in pulverized fuel (PF) and hot fly ash explosions and fires
    • Document provides information, defines acceptable practices, and outlines procedures to prevent accidents and deal with any accidental fires

    Superseded Documents

    • RIHAND-LMI-OD-OPS-SYST-009 Rev.03 (November 2021) listed as a superseded document

    Reference Documents

    • COS-ISO-00-OD/OPS/SYST/009Rev. no.: 0 (August 2022) referenced

    Records of Revision

    • LMI format adjusted according to RIHAND-LMI-OD-GEN-002 Rev 04, July 2021
    • Clause 2.2.1.4 revised, featuring mill outlet temperatures for imported coal/pellet firing
    • Clause 2.6.6 elaborated

    Scope

    • Document outlines operational and maintenance practices for minimizing explosions and fires in pulverised fuel (PF) plants
    • Applicable to 6 x 500 MW units of NTPC Rihand, with specific technical specifications for PF mills, raw coal feeders, and associated PF piping and auxiliaries.

    Discussion and Background Information

    • Possible locations of PF explosions are detailed throughout milling systems, boiler furnaces.
    • Focus on flammable dust/fuel suspensions in the air within explosive ranges and ignition sources.

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    Related Documents

    NTPC RIHAND Pulverised Fuel Plant Operation & Maintenance PDF

    Description

    This quiz focuses on the critical aspects of pulverised fuel operations as outlined in the document RIHAND-LMI-OD-OPS-SYST-009. It assesses knowledge regarding key elements such as design capacity, safety aspects, and equipment references in the context of PF handling and operations.

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