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The main burner on the indirect fired heater is turned off and on by a thermostat which senses ___________________. a. the heater stack temperature b. the heater solution temperature c. the fire tube temperature d. the coil bundle temperature e. the flue gas temperature - ✔️✔️B In a Horizontal Rectangular Direct Fired Heater, the _____ is/are mounted on the floor of the furnace and extend along a center line from the front to the back of the furnace. a. Breeching. b. Convection tubes. c. Radiant tubes. d. Fire box. e. Burners. - ✔️✔️E
Typology: Exams
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The main burner on the indirect fired heater is turned off and on by a thermostat which senses ___________________.
a. the heater stack temperature b. the heater solution temperature c. the fire tube temperature d. the coil bundle temperature e. the flue gas temperature - ✔️ ✔️ B In a Horizontal Rectangular Direct Fired Heater, the _____ is/are mounted on the floor of the furnace and extend along a center line from the front to the back of the furnace.
a. Breeching.
b. Convection tubes. c. Radiant tubes. d. Fire box. e. Burners. - ✔️ ✔️ E In a Vertical Cylindrical Heater, they are bottom fired and have a _____ radiant section and the convection section is _____.
a. Vertical, horizontal. b. Cylindrical, rectangular. c. Circular, oval. d. Longitudinal, circumferential. e. Big, small. - ✔️ ✔️ B The burners on fired heaters are similar to what type of other burners? - ✔️ ✔️ The ones used on boilers The main fuel and bypass fuel control valves regulate the fuel pressure to the:
a. Main safety shut off valve.
c. An air compressor. d. An air register. e. An outlet damper. - ✔️ ✔️ D How could unburned fuel be ignited in a fired heater if no flame is present? - ✔️ ✔️ The hot refractory could ignite the fuel How is draft measurement done? - ✔️ ✔️ With draft gauges that are special types of inclined manometers How should you set the airflow for excess air? - ✔️ ✔️ Reduce the air until the flame starts to turn orange then increase the air slightly The _____ and the _____ assembly are mounted on top of the convection section of vertical fired heaters.
a. Economizer, superheater. b. Economizer, air heater. c. Stack, damper. d. Reheater, reboiler. e. Air heater, superheater. - ✔️ ✔️ C Normal areas to measure draft in a fired heater are:
a. 1, 2, 3 b. 1, 2, 4 c. 1, 3, 4 d. 2, 3, 4 e. 1, 2, 3, 4 - ✔️ ✔️ D On a fired heater the manual vent value downstream of the constant fuel pressure regulator is used for the purpose of:
a. Venting the gas when the pressure is too high. b. Flaring of the gas when the pressure is too high. c. Venting the gas during shut down to isolate the downstream piping.
What is the term used to describe the flow of combustion gasses upwards from the burners to the stack? - ✔️ ✔️ Updraft The _____ controls the amount of the flue gas exiting the fired heater.
a. Air register on the burner. b. Stack. c. Induced draft gage. d. Forced draft fan. e. Stack damper. - ✔️ ✔️ E The burner of an indirect heater will burn at ____________ rate until the desired heat transfer fluid temperature is reached.
a. ¼ b. ½ c. ¾ d. full e. modulating - ✔️ ✔️ D The inner walls and floor of a vertical fired heater are lined with:
a. Refractory bricks. b. Tubes. c. Heating coils. d. Cooling coils. e. Metal sheaths. - ✔️ ✔️ A Heaters in which the flue gas does not come in contact with the process heating tubes are:
a. Combination fired heaters. b. Radiant fired heaters. c. Convection fired heaters. d. Indirect fired heaters. e. Direct fired heaters. - ✔️ ✔️ D In an indirect fired heater the fluid flowing in the process tubes is heated by the:
a. Intermediate fluid that is heated by the fire tube.
What type of heater essentially divides the furnace vertically? How? - ✔️ ✔️ The "central tube wall" design. It has a row of radiant tubes that divides the furnace vertically.
It's often referred to as a double fired design. A Eutectic salt solution used as a heat transfer medium in an indirect heater is a mixture of:
a. Sodium nitrate and magnesium nitrate. b. Calcium nitrate and magnesium nitrate. c. Sodium nitrate and calcium nitrate. d. Sodium nitrite and potassium nitrate. e. Calcium nitrate and potassium nitrate. - ✔️ ✔️ D What is the advantage of oil bath heaters (beside heating up to 260° C) - ✔️ ✔️ The oil protects the heating tubes from general corrosion and pitting What is the efficiency of convection heaters? - ✔️ ✔️ 75 to 85% When a direct-fired heat is used to heat the process fluid drawn off the bottom of a fractionator tower, it is called fractionator:
a. Heater. b. Reboiler. c. Reaction. d. Storage. e. Cracking. - ✔️ ✔️ B When only one burner is on and the burner pressure is low, what could you say of the heater? - ✔️ ✔️ It is on minimum firing Which of the following require the use of direct fired heaters.
a. 1, 2, 3 b. 1, 2, 4
d. Tripping of the LWFCO. e. Energizing of the electric igniter. - ✔️ ✔️ E
The book just says that following the purging, the BMS allows the pilot to be lit. What are the three main components of an indirect fired heater? - ✔️ ✔ ️ The shell or heat media reservoir
A burner or fire tube
Process coil bundle What could High Stack temperature trip be an indicator of? - ✔️ ✔️ A tube inside leaking and spraying combustible fluid into the furnace If the fired heater is to be started in short time after it is shut down, the _____ can be shut to keep the heater warm.
a. Main observation door. b. Forced draft fan inlet vanes.
c. Induced draft fan inlet vanes. d. Stack damper and air register. e. Manway cover plate. - ✔️ ✔️ D The fuel shut off valves to the burners are normally in the _____ position, when the heater is on line.
a. Closed. b. Throttled. c. 3/4 open. d. Open. e. 1/3 open. - ✔️ ✔️ D What is the way to more accurately determine the excess air? - ✔️ ✔️ By using an oxygen analyzer on the flue gas What is typically the percentage of excess air? - ✔️ ✔️ Between 10 and 30% What should a good burner flame look like? - ✔️ ✔️ Translucent blue with orange tips Are salt baths corrosive to the coils or shell? - ✔️ ✔️ No
