What is needed to be increased to increase the heat transfer rate in the boiler?

What is needed to be increased to increase the heat transfer rate in the boiler?

Explanation: Water velocity is required to be increased rather than gas velocities to increase the rate of heat transfer rate in the boiler, because a considerable increase in pressure is more easily produced with water than with gas. Hence, for a given output in boiler, smaller diameter tube may be used.

Which of the following device is used for the increasing the efficiency of boiler?

turbulator

How do I increase the heat in my boiler?

15 Ways To Increase Boiler Efficiency

1. Increase Boiler Efficiency: Lower the Stack Temperature. Lowering stack temperatures may be as simple as a day/night set back.
2. Install an Economizer.
3. Install a Variable Frequency Drive.
4. Increase Boiler Efficiency: Insulate your Valves.
5. Clean the Fireside.
6. Preheat Combustion Air.
7. Control Blowdown Rate.
8. Reduce Excess Air.

Which of the following component of the boiler is used to recover the waste heat of the flue gases for heating feed water?

recuperator

How is boiler evaporation rate calculated?

The boiler evaporation ratio is expressed as follows: Evaporation ratio = quantity of steam generation/quantity of fuel consumed. For example quantity of steam Is 310 ton/hr and fuel is 55 ton/hr then the evaporation ratio is 5.63.

What are the principle heat losses that occur in a boiler?

The Boiler Efficiency Calculator takes into account only major energy losses‚ which typically represent 10 to 20 % of fuel input. The major energy losses associated with boilers fall into two categories: stack losses‚ and radiation and convection losses.

Which of the following is not a boiler accessories?

Which of the following is NOT a boiler accessory? Explanation: The correct answer is mud hole (or sight hole). Feed pump, steam trap, steam separator are all boiler accessories whereas a mud hole is a boiler mounting.

Which among the following is not a boiler mounting?

Which of the following is NOT a boiler mounting? Explanation: Steam stop valve, Man hole and pressure gauge are boiler mountings. Economizer is a boiler accessory.

Which one of the following is a correct sequence of accessories in a boiler plant?

fan. The correct sequence of the flow of flue gases through these boiler accessories is: (a) 1, 3, 4, 2 (b) 3, 1, 4, 2 (c) 3, 1, 2, 4 (d) 1, 3, 2, 4 77. Ans. (d) The correct sequence for flow of flue gases in boiler is superheater, economiser, air heater and I. D.

What are boiler accessories?

The following are the important accessories of the boiler are: Feed water pump Injector Pressure reducing valve Economiser Air pre heater Super heater Steam drier or separator Steam trap 1. Feed water pump: the feed water pump is used to feed water to the boiler.

Can a boiler work without mounting?

Boiler mountings are components used for ensuring the safety of boiler operation. These are generally mounted on the surface of the boiler. Control fluid parameters at the inside of the boiler shell. The mountings are an essential part of a boiler, without which boiler operation is impossible.

Which of the following is fitting in a boiler mounting?

Right Answer is: C Feed check valve is a boiler mounting used to regulate the flow of boiler feed water.

What are the mounting and accessories?

Mountings and Accessories of a Boiler | Thermodynamics

• Dead Weight Safety Valve: As the name implies, this valve is used to assure safe working of the boiler.
• High Steam Low Water Alarm: ADVERTISEMENTS:
• Water Level Indicator: It indicates the water level inside the boiler drum.
• Fusible Plug:
• Bourdon Pressure Gauge:
• Steam Stop Valve:
• Air Preheater:
• Feed Pump:

What is the function of mounting?

The purpose of mounting is to protect fragile or coated materials during preparation and to obtain perfect edge retention. Mounting is used when the protection of layers is imperative, and also it enables a safer and more convenient handling of small, sharp, or irregularly shaped specimens, for example.

What is boiler mounting write down them and state their functions?

Boiler mountings are a set of safety device installed for the safe operation of a boiler. There are seven main mountings on a boiler shell; safety valve, steam stop valve, vent valve, pressure gauge, water level indicator, feed check valve and fusible plug.

Is fusible plug is mounting?

Boiler mountings are the devices mounted on the boiler surface for safe operation, efficient working, control steam generation and easy maintenance of the boiler.

At what temperature does a fusible plug melt?

Fire-activated fusible plugs are filled with pure tin and feature a melting point between 445°F and 450°F.

Where is fusible plug located?

A fusible plug operates as a safety valve when dangerous temperatures, rather than dangerous pressures, are reached in a closed vessel. In steam engines the fusible plug is screwed into the crown sheet (the top plate) of the firebox, typically extending about an inch (25mm) into the water space above it.

What is the purpose of a fusible plug?

Purpose. A fusible plug operates as a safety valve when dangerous temperatures, rather than dangerous pressures, are reached in a closed vessel. Fusible plugs are commonly installed in aircraft wheels, most typically in those of larger or high-performance aircraft.

What is the difference between a fusible plug and rupture disk?

Fusible Plug Devices: This device is a plug made of fusible metal that’s designed to yield or melt at low temperatures. The rating of the metal’s temperature is stamped onto the device. The gas that uses this type of device is acetylene. Combination Rupture Disks: A rupture disk is backed by the previous fusible plug.

How does fusible plug work in a boiler?

The function of fusible plug is to protect the boiler from damage due to overheating of boiler tubes by low water level. it is simply a hollow gun metal plug screwed into the fire box crown. This hollow gun metal plug is separated from the main metal plug by an annulus fusible material.

What is the function of fusible plug in the boiler Mcq?

What is the function of fusible plug in the boiler? Explanation: The function of the fusible plug is to protect the fire tube from burning due to excessive heating. This usually happens when the water level inside the drum becomes too low and the shell and crown plate are directly exposed to steam space. 7.

What causes failure of boiler tube?

Failure of boiler tubes is a very common phenomenon in a power plant. There are many reasons for boiler tube failures such as pitting, stress corrosion cracking, stress rupture, creep, erosion, and thermal fatigue [4], [5], [6], [7], [8]. The failed boiler tube in this investigation is made from 20G steel.

Why is fusible plug fitted to small boilers?

Explanation: Fusible plug is a safety device used to extinguish the fire in the furnace of the boiler when the water level falls too much below the normal level.

What is the function of the feed water pump of a boiler?

Boiler feedwater pumps transport water into boilers using high pressure. Thus, a boiler feed pump is built to handle extremely high water pressure to deliver the feedwater into the boiler system. Generally, a boiler feed pump can handle the pressure of up to 100 bar.

What is the function of pressure gauge in the boiler?

The function of the pressure gauge is to measure the pressure of steam inside the boiler. The gauge is usually mounted on the front top of the shell or drum such that it should be clearly visible to the operator. It consists of a Bourdon spring tube (B) of bronze metal.

What is a boiler blowdown valve?

Boiler blowdown is the removal of water from a boiler. Its purpose is to control boiler water parameters within prescribed limits to minimize scale, corrosion, carryover, and other specific problems. Blowdown is also used to remove suspended solids present in the system.