Location Management: Pulverised Fuel Operations
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Questions and Answers

What should be done if air leaks are detected in the suction system?

  • Monitor them continuously without action
  • Immediately rectify them to prevent explosion risk (correct)
  • Seal them off without further inspection
  • Ignore them if they are minor

    • Which of the following indicates a fire in the milling system?

  • Heavy coal feed to the system
  • Severe pressure fluctuations and rising outlet temperature (correct)
  • Increase in mill outlet temperature with stable power
  • Visible signs of cooling and no smoke

    • What should an operator do if they receive misleading indications from the pulverized fuel plant instrumentation?

  • Continue normal operations without changing procedures
  • Close all operational valves immediately
  • Evacuate restricted areas to minimum staffing levels (correct)
  • Ignore the signals as they are usually false

    • How can a loss of coal feed be distinguished from a fire in the mill system?

    <p>Increase in mill outlet temperature and fluctuation in power</p> Signup and view all the answers

    What immediate action is required if there is evidence of a fire in the milling system?

    <p>Check fire detection systems before taking action</p> Signup and view all the answers

    What is the main topic of the document?

    <p>The Safe Operation and Maintenance of Pulverised Fuel Plant</p> Signup and view all the answers

    What does the revision date indicate?

    <p>The date the last changes were made to the document</p> Signup and view all the answers

    Which section discusses sources of ignition?

    <p>2.2 Sources of ignition</p> Signup and view all the answers

    What is one of the purposes of the document's index?

    <p>To outline the structure and locations of topics within the document</p> Signup and view all the answers

    Which document detail indicates it has been reviewed?

    <p>Document Reviewed on 02.12.2024</p> Signup and view all the answers

    The section on instructions and training is likely included to ensure what?

    <p>Compliance with industry standards</p> Signup and view all the answers

    What does the abbreviation 'HOP' in the approval section most likely stand for?

    <p>Head of Operations</p> Signup and view all the answers

    What is a critical condition for non-return valves to provide total protection against furnace ignition sources?

    <p>The forward flow of air/fuel must be halted or reversed.</p> Signup and view all the answers

    Which of the following can be a source of ignition in the boiler furnace?

    <p>Hot refractory</p> Signup and view all the answers

    What measures can be taken to minimize ignition risks outside the boiler?

    <p>Eliminate sources of ignition during cleaning operations.</p> Signup and view all the answers

    Which aspect is essential for avoiding fires and explosions in P.F. plant operations?

    <p>Proper maintenance and operation standards.</p> Signup and view all the answers

    How is the competency of P.F. operations staff ensured?

    <p>Through annual reviews of their competence.</p> Signup and view all the answers

    What is the main basis for the safe firing of pulverised fuel?

    <p>Availability and reliability of oil burners.</p> Signup and view all the answers

    What is required from personnel before they are promoted to positions in P.F. plant operations?

    <p>Instruction and training to a competent level.</p> Signup and view all the answers

    What records are maintained in relation to P.F. plant operations?

    <p>Training records of the staff.</p> Signup and view all the answers

    During which circumstances can significant risks from P.F. escape arise?

    <p>While cleaning operations create dust clouds.</p> Signup and view all the answers

    What must staff understand to ensure the safe operation of oil burners?

    <p>Oil installation and operation principles.</p> Signup and view all the answers

    What is necessary for a mixture to be considered explosive?

    <p>A concentration of combustibles in suspension in air</p> Signup and view all the answers

    Which of the following components are included in the definition of a Pulverized Fuel (P.F) Plant?

    <p>The P.F. burners fed by the mill</p> Signup and view all the answers

    How does the air/fuel ratio behave during mill startup?

    <p>It changes from very weak to normal</p> Signup and view all the answers

    Which part of the P.F plant is bounded by the bunker outlet(s) and the associated primary air fan discharge?

    <p>The Mill system</p> Signup and view all the answers

    Which area is crucial to consider in relation to the development of explosions in the mill?

    <p>The coal bunker and primary air ducting</p> Signup and view all the answers

    What is a common occurrence at mill startup and shutdown?

    <p>Development of an explosive mixture of P.F and air</p> Signup and view all the answers

    What does the term 'classifier' refer to in the milling context?

    <p>An air/particle separator</p> Signup and view all the answers

    What can affect the quantity of coal in the milling system during operation?

    <p>Shutdown conditions and subsequent work</p> Signup and view all the answers

    Which of the following components is NOT part of the Pulverized Fuel (P.F) plant?

    <p>The water cooling system</p> Signup and view all the answers

    What should be done if a fire is suspected in the milling system?

    <p>The milling system will not be put into service.</p> Signup and view all the answers

    What is the minimum velocity required in P.F. pipes to minimize deposition of fuel?

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

    How should operations respond to indications of mill fires or coal flow failure?

    <p>Proceed as trained on how to manage the situation.</p> Signup and view all the answers

    What is required in the vicinity of the P.F. plant during unstable operating conditions?

    <p>Minimum personnel allowed under controlled conditions.</p> Signup and view all the answers

    What should be established to ensure abnormalities are urgently communicated?

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

    What indicates a need for evacuation in a P.F. station?

    <p>Indications of over pressurization.</p> Signup and view all the answers

    What should be the maximum mill outlet temperature during normal operation based on?

    <p>The nature of the coal and design of the milling system.</p> Signup and view all the answers

    What are mill fire detectors considered to be in the context of P.F. plant maintenance?

    <p>Design features that protect against fires and explosions.</p> Signup and view all the answers

    What is the purpose of establishing an evacuation procedure in P.F. stations?

    <p>To respond to risks appropriately.</p> Signup and view all the answers

    What should be done on a standing mill regarding the mill body temperature?

    <p>Keep it as low as practicable.</p> Signup and view all the answers

    Study Notes

    Location Management Instructions

    • RIHAND-LMI-OD-OPS-SYST-009
    • Revision 04, August 2022
    • Document reviewed on 02.12.2024
    • Approved for implementation by: HOP (Rihand)

    Index

    • Includes topics like introduction, superseded documents, reference documents, records of revision, scope, discussion and background information, sources of ignition, development of an explosive mixture, principles in safe operation/maintenance of pulverised fuel plant, operational procedures (fires in milling systems, actions in a mill system containing a fire, putting/taking a mill system into service, coal flow failure, furnace precautions, burner management system [BMS]/FSSS, bunkers, boiler ash and dust hoppers), responsibility, review, distribution list, LMI checklist - annexure-I, annexure-I

    Introduction

    • Ignition of finely divided combustible material in suspension in air can lead to significant explosion/flame emission
    • All dusts, whether hot or cold, are considered dangerous
    • Essential that personnel are aware of related risks and have training in avoiding them

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    NTPC RIHAND Pulverised Fuel Plant Operation & Maintenance PDF

    Description

    This quiz covers safety and operational procedures related to pulverised fuel plants, focusing on the risks of ignition and explosions. It includes operational protocols for managing mills, handling fires, and ensuring safe maintenance practices. Understanding these principles is crucial for safe operations and accident prevention.

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