Coal Handling Plant Overview

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Questions and Answers

What is the primary function of a Coal Handling Plant (CHP)?

To store coal only

To process raw coal for fuel generation

To manage the entire coal handling process from receipt to storage (correct)

To convert coal into electricity

Which of the following processes is NOT typically handled by the Coal Handling Plant?

Coal washing (correct)

Coal collection

Coal milling

Coal crushing

What is the purpose of stockpiles in a Coal Handling Plant?

To facilitate automatic loading onto rail cars

To reduce the need for raw coal deliveries

To allow for constant coal feeding to the washplant (correct)

To increase the size of coal mills

What factor is NOT a benefit of taller and wider stockpiles?

Higher risk of spontaneous combustion Signup and view all the answers

What equipment is commonly used to create coal stockpiles?

Travelling, lugging boom stackers Signup and view all the answers

How is low-cost coal reclaiming typically achieved?

Using front-end loaders Signup and view all the answers

What is often a result of coal stockpiles having larger volumes?

Increased risk of spontaneous combustion Signup and view all the answers

Which component is essential for the effective operation of a Coal Handling Plant?

Mechanical conveyors for coal transport Signup and view all the answers

What percentage of the thermal power station's coal requirement is typically fulfilled by railway transportation?

80-90% Signup and view all the answers

What is the usual free time allowed for unloading coal rakes after receipt?

12-14 hours Signup and view all the answers

Which of the following is NOT considered a major auxiliary of Combined Heating and Power (CHP)?

Cooling Towers Signup and view all the answers

What is the demurrage rate charged per ton per hour if coal rakes are not unloaded in the given free time?

Rs. 1.00 Signup and view all the answers

What is the primary function of wagon tipplers in a coal processing system?

To unload coal wagons into hoppers Signup and view all the answers

How much higher is the value derived through CHP compared to bulk gas sales?

70-80% Signup and view all the answers

What type of transportation method accounts for 5-10% of coal delivery to thermal power stations?

Road Signup and view all the answers

Which equipment is specifically used for controlled removal of coal from hoppers?

Vibrating Feeders Signup and view all the answers

What is the primary function of trippers in a coal handling plant?

To feed coal to different bunkers Signup and view all the answers

During which operational cycle is coal unloaded from wagons directly into bunkers?

Normal Bunkering Cycle Signup and view all the answers

What does the weighing of coal at a wagon tippler determine?

The weight of coal unloaded Signup and view all the answers

Which system is specifically designed to suppress coal dust in the coal handling plant?

Dust Extraction System Signup and view all the answers

How are stone shells typically handled if they are received with coal?

Removed manually or with machines Signup and view all the answers

What is the role of electromagnetic separators in coal processing?

To remove iron and magnetic impurities Signup and view all the answers

What primary action occurs during the stacking cycle in a coal handling plant?

Excess coal is stacked on the ground Signup and view all the answers

What happens to any disputes regarding coal weighing?

Settled by a committee of both parties Signup and view all the answers

Study Notes

Overview of Coal Handling Plant (C.H.P)

CHP stands for Coal Handling Plant, responsible for managing coal from receipt to boiler.
Functions include the processing and storage of coal to ensure suitability for boiler operation.

Functions and Responsibilities

Receives coal from coal mines, weighs, crushes to necessary size, and transports to various coal mill bunkers.
Operates under the larger bulk material handling sector, ensuring efficient coal preparation.

Stockpiles

Stockpiles provide surge capacity for coal supply to the washplant, accommodating coal delivery variability.
Simple stockpiles can be formed using machinery or conveyor booms; controlled stockpiles utilize stackers for efficiency.
Taller stockpiles minimize land usage but increase the risk of spontaneous combustion due to reduced heat loss.

Transportation Modes

Thermal power stations primarily receive coal via railway (80-90%).
Additional modes include road transport (5-10%) and aerial ropeways, predominantly for nearby stations.
Road transportation is more expensive compared to rail, influencing coal sourcing decisions.

Demurrage and Coal Rakes

Coal arrives in rakes (55-60 wagons) and must be unloaded typically within 12-14 hours to avoid demurrage charges.
Rates for demurrage are assessed at Rs. 1/- per ton per hour on full rake capacity (approx. 3300 metric tons).

Major Equipment in C.H.P

Wagon Tipplers: Unload coal wagons rapidly (up to 20 wagons/hr).
Vibrating Feeders: Control removal of coal from hoppers.
Conveyor Belts: Move coal across sites utilizing synthetic rubber belts on metallic rollers.
Coal Crushers: Crush irregularly shaped coal lumps to required sizes.
Trippers: Distribute coal to designated bunkers.
Electromagnetic Separators: Remove iron and magnetic impurities from coal.
Dust Extraction Systems: Suppress coal dust within the plant environment.
Gas Extractors: Eliminate harmful gases from the working atmosphere.

Operational Cycles

Normal Bunkering Cycle: Direct transfer of coal from wagons to bunkers.
Stacking Cycle: Coal is stacked in open yards when bunkers are full.
Reclaiming Cycle: Coal from stockpiles is transferred to bunkers when wagons are unavailable.

Weighing and Payment of Coal

Weighing occurs at the wagon tippler by comparing loaded and unloaded wagon weights.
Disputes regarding coal measurement are settled by a joint committee of coal mines and plant representatives.

Stone Shells and Chemical Analysis

Stone shells mixed with coal must be removed prior to bunkering, either manually or mechanically.
A compensation for exceeded stone shells is recovered from coal mines.
Random samples of coal are chemically analyzed to determine calorific value and compliance with agreements.

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Description

This quiz provides a comprehensive understanding of the Coal Handling Plant (C.H.P). Learn the process of coal handling from receipt to transportation for boiler operation, including key functions like weighing and crushing. Test your knowledge on the fundamental concepts of coal processing.