Marine Boiler Water Management Quiz

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Questions and Answers

What is the primary purpose of treating water used for marine boiler plants?

Carry-over prevention

Scale prevention (correct)

Sedimentation prevention

Corrosion prevention

What is an important duty for operators of marine boilers in terms of water quality management?

Regularly clean the boiler tubes

Conduct fuel consumption analysis

Carefully analyze feed water/condensate and boiler water (correct)

Monitor steam pressure constantly

What should operators do when analysis results differ from predicted values?

Increase the chemical dosage in the water

Ignore the results if they fall within acceptable limits

Immediately shut down the boiler system

Investigate the cause of the discrepancy (correct)

What must the marine boiler operator responsible for water quality demonstrate comprehensive knowledge of?

Principles of boiler plant water quality Signup and view all the answers

$H_2O$ feedwater at 3.021MPa and 179°C is most likely intended for which part of the marine boiler system?

$NO.1$ Boiler Signup and view all the answers

What is the purpose of the cascade tank in the marine boiler system?

To hold water for the marine boiler system and be fed by the distilled water tank Signup and view all the answers

In which mode does the auxiliary boiler for diesel VLCCs operate at sea?

EGE mode, using saturated steam for heating fuel oil and water Signup and view all the answers

What is the purpose of the atmospheric condenser in the steam and feed water flow diagram for diesel ships?

To cool steam and drain water back to the cascade tank Signup and view all the answers

What happens if boiler water quality is not satisfactory?

Water can be drained overboard to reduce enrichment or remove impurities Signup and view all the answers

What is the role of exhaust gas from the main diesel engine in generating steam?

Used to heat evaporators to produce low-pressure and medium-pressure steam Signup and view all the answers

What are the two modes of operation for auxiliary boilers on diesel VLCCs?

At sea in EGE mode, and in port in tanker mode Signup and view all the answers

What is the purpose of injecting hydrazine into the cascade tank in the marine boiler system?

To prevent oxygen corrosion Signup and view all the answers

Where are salinity indicator cells located in the marine boiler system?

On the outlet-side condensate lines and air ejector outlet line Signup and view all the answers

What is the purpose of the atmospheric drain tank in the marine boiler system?

To collect and dispose of condensate water and low-salinity distilled water Signup and view all the answers

What is the primary function of boiler compounds injected into the compound tank in the marine boiler system?

To improve boiler water quality Signup and view all the answers

Where can boiler water inside the steam separator tank and auxiliary boiler be drained to reduce impurities?

Overboard Signup and view all the answers

What is a critical aspect of boiler water management for efficient and safe operation of steam turbine ships?

Maintaining water level and quality Signup and view all the answers

What is the purpose of the injection of boiler compounds?

To supply the boiler with dissolved compounds using a dedicated pump Signup and view all the answers

Where are salinity indicators located and what is their function?

They are located on the outlet-side condensate line and they monitor boiler water quality Signup and view all the answers

What is the function of the de-oiler and oil content monitor?

To address oil content in the drain return line and to monitor its concentration Signup and view all the answers

What is the purpose of the grease extractor in relation to the drain pump?

To remove oil content from the feed water line before reaching the gland condenser Signup and view all the answers

What is the function of blow-off pipe in a boiler system?

To remove sludge and other impurities from the boiler Signup and view all the answers

What is the design pressure of vertical cylindrical smoke tube boilers used in auxiliary boilers for common diesel ships?

0.8MPaG Signup and view all the answers

What is the evaporation range for vertical cylindrical composite boilers used in auxiliary boilers for common diesel ships?

300-3,000 kg/h Signup and view all the answers

What type of boilers are used in main boilers for steam turbine ships on LNG carriers?

Vertical cylindrical water tube composite boilers Signup and view all the answers

What is the purpose of fin tube-type exhaust gas economizers used in marine boilers?

To recover thermal energy from exhaust gas Signup and view all the answers

How many operating modes do double-drum water tube boilers used in auxiliary boilers for large diesel ships typically have?

2 Signup and view all the answers

What is the primary classification basis for marine boilers mentioned in the text?

Design and function Signup and view all the answers

Study Notes

Marine boilers are used in ships for producing steam, each with specific purposes: auxiliary boilers for common diesel ships, auxiliary boilers for large diesel ships, and main boilers for steam turbine ships.
Auxiliary boilers for common diesel ships have vertical cylindrical smoke tube boilers (1) and vertical cylindrical composite boilers (2-1):
- Smoke tube boilers have a standard design pressure of 0.8MPaG, furnace is full water-cooled type, 600-1,500 kg/h evaporation, and heating surface is smoke tube.
- Composite boilers have a standard design pressure of 0.8MPaG, furnace is full water-cooled type, 300-3,000 kg/h evaporation (for both oil firing and exhaust gas sides), and heating surface is smoke tube.
Auxiliary boilers for large diesel ships have double-drum water tube boilers (2-2), which produce steam in the 1.57-2.0MPaG pressure spectrum and have two or more operating modes.
Main boilers for steam turbine ships have vertical cylindrical water tube composite boilers (3) and vertical cylindrical water tube boilers (4), which are used on LNG carriers and have large combustion chambers.
Fin tube-type exhaust gas economizers (5) are used to recover thermal energy from exhaust gas and generate saturated and superheated steam.
Marine boilers are classified into three groups based on working pressure and managed to prevent accidents.
Water management is crucial for marine boilers as it affects feed water and condensate quality.
Exhaust gas economizers have their own drum for separating steam and are connected to auxiliary boilers for water separation.
The text provides information on various types of marine boilers and their specifications, as well as the importance of marine boiler water management.

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Description

Test your knowledge of marine boiler water management, steam, and feed water flow for diesel ships with this quiz. Explore the components of a steam and feed water flow diagram for a diesel ship's boiler system.