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

What does the revision date indicate?

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

Which section discusses sources of ignition?

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

Which document detail indicates it has been reviewed?

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

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

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

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

<p>Head of Operations (D)</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. (B)</p> Signup and view all the answers

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

<p>Hot refractory (D)</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. (B)</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. (B)</p> Signup and view all the answers

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

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

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

<p>Training records of the staff. (D)</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. (C)</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. (C)</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 (C)</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 (A)</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 (A)</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 (A)</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 (A)</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 (C)</p> Signup and view all the answers

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

<p>An air/particle separator (B)</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 (B)</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 (C)</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. (B)</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 (C)</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. (C)</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. (B)</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. (A)</p> Signup and view all the answers

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

<p>Indications of over pressurization. (B)</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. (D)</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. (D)</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. (C)</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. (C)</p> Signup and view all the answers

Flashcards

RIHAND-LMI-OD-OPS-SYST-009

A document containing guidelines and information for safe operation and maintenance of pulverised fuel plants at the Rihand power station.

Explosive mixture

A mixture of air and combustible fuel particles that can explode if ignited.

Sources of ignition

Any source of heat or energy that can initiate combustion in an explosive mixture.

Training of P.F. personnel

The process of training and educating employees on the safe operation and maintenance of pulverised fuel systems.

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Superseded documents

The document that was replaced by the current version.

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Reference documents

Documents that provide supporting information or references for the document.

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Records of revision

Keeping track of changes and revisions made to the document over time.

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Ignition Source

A source of energy that is sufficient to ignite an explosive mixture, such as a spark or a hot surface.

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Pulverized Fuel (P.F.) Plant

The area within a power plant that includes the coal bunker, pulverized fuel (P.F.) burners, and the primary air fan discharge.

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Mill System

The part of the P.F. plant that encompasses the coal bunker outlet, the mill, the primary air fan discharge (or the points where air ducts leave), and the furnace.

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Explosive Mixture Development at Mill Start-Up and Shutdown

The unavoidable occurrence of an explosive mixture during the start-up and shutdown of a pulverized fuel mill.

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Air/Fuel Ratio Dependence on Shutdown Conditions

The air-to-fuel ratio inside the mill and classifier is highly dependent on the conditions at the time of shutdown and any subsequent changes to the coal quantity within the system.

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Air/Fuel Ratio Transition During Mill Startup

The air-to-fuel ratio in P.F. pipework systems and mills must shift from a very weak mixture to a normal burning mixture as the mill becomes operational.

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Risk of Explosion During Mill Startup

The danger of an explosive mixture forming in the mill and pipework systems due to the variation in air-to-fuel ratio during the startup process.

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Risk of Explosion with Vertical Spindle Mills

The risk associated with vertical spindle mills, where the air-to-fuel ratio shift during startup may create a more hazardous situation.

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PF system inspection

The process of inspecting the pulverized fuel (PF) system, recording results, and taking corrective action.

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Explosive air/fuel mixture

A condition where air and fuel particles are mixed in such a way that an explosion can occur if ignited.

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Fire in a mill system

Visible signs of fire in a mill system, such as smoke, sparks, and high temperatures.

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Loss of coal feed

A sudden drop in coal feed to the mill.

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Misleading instrumentation

A situation where the instrumentation may provide confusing or misleading readings, potentially leading to an emergency.

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Low Load Operation

Operating conditions where the load on the system is significantly lower than the designed capacity, potentially leading to inefficiencies and instability.

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Non-Return Valves in P.F. lines

A safety measure that prevents reverse flow of air/fuel in the Pulverized Fuel (P.F.) lines, ensuring that the furnace is only ignited during the intended forward flow, not due to reversal or slow down.

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Other Ignition Sources in the Boiler Furnace

Sources of ignition within the furnace that are not the intended flame, including hot refractory materials, ash, and slag deposits.

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Ignition Sources Outside the Boiler

Potential ignition sources outside the boiler, such as welding operations or dust clouds containing P.F., which pose a risk if not controlled.

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Oil Burner Reliability

The main principle behind safe P.F. operation, emphasizing the crucial role of oil burners in ensuring the reliability and stability of the firing process.

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P.F. Plant Staff Training

The responsibility of training and supervising P.F. plant operators and maintenance personnel to maintain high operational standards and prevent fires/explosions.

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P.F. Plant Glossary

A glossary of standard terms related to the plant, compiled for P.F. plant operators and maintenance personnel.

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Annual Competence Review

Continuing competence review for P.F. plant operational staff, conducted annually to ensure their skills and knowledge are up to date.

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Training for Temporary Personnel

Temporary personnel promoted to positions related to P.F. plant operation must undergo appropriate training and instruction.

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Training Records

The essential requirement of maintaining detailed records of training received by P.F. plant personnel.

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Fire Suspicion and Milling Systems

If a fire is suspected in the coal feeder or bunker, the milling system should not be activated.

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Preventing Fuel Accumulation

Fuel oil and gas leaks must be addressed immediately, preventing accumulation in the P.F. system.

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P.F. Pipe Velocity

The velocity of fuel inside the P.F. pipes must be above 15 m/s or as specified by the manufacturer to minimize fuel deposition.

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Personnel Near P.F. Plant

Limited personnel are allowed in the vicinity of the P.F. plant, especially during unstable operating conditions.

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P.F. System Failure Training

Training should cover identifying signs like loss of ignition, mill fires, and coal flow failure, and procedures for addressing these situations.

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Clear Communication Chain

A clear communication chain is vital to swiftly notify appropriate staff in case of any abnormalities in the P.F. system.

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P.F. Evacuation Procedure

Every P.F. station needs an evacuation procedure, tailored to the plant's risk category.

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Over Pressurization

Over pressurization in the P.F. system, including pressure relief vent activation, indicates a potential ignition source.

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Mill Temperature (Standing)

When a mill is inactive, maintain the mill body temperature at the lowest possible level.

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Mill Outlet Temperature (Running)

The acceptable maximum mill outlet temperature while running depends on the type of coal and mill design. Set the alarm temperature 5 degrees D higher than this maximum.

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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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