12 Questions
What is the purpose of the Optisperse HPT-0453 injected into the steam drum?
To protect the water circuits from boiler deposits
How many fuel gas burners are on each boiler?
Nine main and nine pilot
What is the function of the forced draught fans in the system?
To supply combustion air to each boiler
How is steam preheated before entering the economizer of the boiler?
Using SB steam
What is the pressure and temperature of the steam supplied to the range?
62 barg pressure and 440°C temperature
How many feed water pumps does each pair of boilers have?
Three
What is the purpose of the spray water for attemperators?
To control the temperature of the spray water
What is the function of the downcomers and rear water wall tubes in the system?
To separate steam and water mixture from water wall risers
How is the steam-water mixture from water wall risers separated in the drum?
By passing through horizontal steam separators
What is the purpose of the spark rods installed in the system?
To detect flames
How is the combustible gas produced in the system?
By mixing fuel gas and induced combustion air
What is the function of the chevron driers in the system?
To expel heavier water particles out by centrifugal motion
Study Notes
- There are boilers that generate steam from natural gas.
- Each boiler can generate up to 360 tonnes/hr.
- Fuel gas is routed through knock out drums to remove entrained liquid.
- There are nine main fuel gas burners and nine pilot fuel gas burners on each boiler.
- Forced draught fans supply combustion air to each boiler.
- The hot furnace gases heat the furnace water walls and the heat recovery area.
- Boilers are operated in pairs and each pair has three feed water pumps.
- Water is introduced into the unit through the economiser.
- Water mixes up with water recirculated from the furnace water wall tubes and the HRA.
- The boilers are discharged to atmosphere through the stacks.
- Steam is preheated using SB steam before entering the economizer of the boiler.
- Feed regulating flow control valves are used to regulate the flow of steam.
- Spray water for attemperators is provided from the upstream of the feed regulating valves.
- Temperatures control valves are used to control the temperature of the spray water.
- Optisperse HPT-0453 is injected into the steam drum to protect the water circuits.
- Optisperse is a boiler deposits control agent for metals oxide control.
- Steam from the boilers is supplied to the range at 62 barg pressure and 440°C temperature.
- The four boilers are operated as two pairs.
- Boilers 1&2 as a pair supply steam to the range.
- Boilers 3&4 as a pair supply steam to the range.
- Water leaves the drum through downcomers and rear water wall tubes.
- An internal circumferential baffle forms an annulus along the bottom half of the steam drum.
- Steam-water mixture from water wall risers enters the drum between the baffle and the drum shell.
- Mixture passes through horizontal steam separators for first stage separation.
- Horizontal separators mounted along each side of the drum separate steam and water mixture from water wall risers.
- Steam leaves the drum through chevron driers mounted in a row below the dry box at the top of the drum.
- Curved counter of the separator expels heavier water particles out by centrifugal motion.
- The first stage separation of steam from water is accomplished in the drum.
- The drum has a downcomer and rear water wall tubes.
- The horizontal separators mounted along each side of the drum separate the steam and water mixture entering the drum through water wall risers.
- Combustible gas is produced by mixing fuel gas and induced combustion air
- The mixed gas is discharged at the top of the pipe
- Two spark rods are installed, one positive and one negative
- The negative rod is grounded
- The flame detection rod is used in common with the negative rod
- The text describes a process or system related to combustion
- The purpose of the spark rods is not explicitly stated
- The text does not provide information on the scale or context of the system
- The language used is technical and specialized, suggesting a specific audience
- The text is concise and focused on describing the technical details of the system.
"Test your knowledge of combustion systems with our technical quiz. From boilers to spark rods, this quiz will challenge your understanding of the processes and technologies involved in generating steam from natural gas. Put your skills to the test and see how much you really know about this complex system. Keywords: combustion, boilers, natural gas, steam, spark rods, technical."
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