A sootblower is a device for removing the soot that is deposited on the internal furnace tubes of a boiler during combustion to prevent plugging of the gas passes and maintain boiler efficiency. Types of soot blowers: … Long Retractable Soot Blower (LRSB) or IK (Insertable Kinetic) Air Heater Blower.

What is the purpose of a soot blower?

A soot blower blasts air, steam or water (or a combination) to remove soot and ash from the interior walls of the boiler heating surfaces.

What is Wall seal blower?

Wall Blower is a sootblower suitable for the cleaning of wall heating surfaces with heavy slagging and high flue gas temperatures up to 1.600 °C. The Wall Blower is fully retracted from the furnace when not in use to protect the nozzle and screw tube from the high heat conditions found in the furnace.

What do you understand by term soot blowing?

Definition of soot blowing : removal of soot deposits on the tubes of a steam generator by a blast of air or steam.

What state is the soot blower in when not in use?

7. In which state would be the soot blower when it’s not in use? Explanation: When not in use the soot blower tube of the system would be dry and uncooled, and subject to gas temperatures.

Why blowdown is provided in a boiler?

The primary purpose of blowdown is to maintain the solids content of boiler water within certain limits. This may be required for specific reasons, such as contamination of the boiler water. In this case, a high blowdown rate is required to eliminate the contaminants as rapidly as possible.

What is Lrsb in boiler?

A sootblower is a device for removing the soot that is deposited on the internal furnace tubes of a boiler during combustion to prevent plugging of the gas passes and maintain boiler efficiency. Types of soot blowers: … Long Retractable Soot Blower (LRSB) or IK (Insertable Kinetic) Air Heater Blower.

How does a soot blower work?

A soot blower works by directing a high-pressure jet of steam, water or air through nozzles onto the cleaning surfaces, thus preventing a deposit build up which would adversely affect the heat transfer efficiency of the heat exchanger. Air, water and steam are the most commonly used cleaning mediums.

What is the main purpose of purging before firing an oil fired boiler?

Purging airflow ensures that any flammable vapors or gases that might have entered the furnace during shutdown are cleared. Before you start up your furnace, give it a few minutes and let it breathe.

How does a superheater work?

Superheaters and reheaters are specially designed to increase the temperature of the saturated steam and to help control the steam outlet temperature. They are simple single-phase heat exchangers with steam flowing inside and the flue gas passing outside, generally in the cross flow.

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What is the advantage of using a retractable soot blower?

The retractable lance will remove any soot, ash or slug accumulated in the tubes. If these accumulations are not removed, a reduced heat transfer and increase in the tube metal temperatures will occur leading to failure of the tubes. In some instances, the increased metal temperatures can lead to boiler fires.

What is a good indication when starting soot blowing?

Operation checks of RSB (Rotary Soot Blower) in Power plant Stack temperature should be checked and recorded regularly as an indicator of soot deposits. When the flue gas temperature raises by about 20 deg. C above the normal temperature for newly cleaned boiler soot deposits are the main concern.

How does water tube boiler work?

In a conventional fire tube boiler, the hot gases move from the firebox into heating tubes immersed by water in the tank. As the walls of the tubes are heated by the gas, the heat transfers into the water, eventually converting the hot water to steam.

Which one is accessory of boiler?

The essential boiler accessories are: Air pre-heater. Superheater. Feed pump. Steam Separator.

What is the function of steam drum?

Unsourced material may be challenged and removed. A steam drum is a standard feature of a water-tube boiler. It is a reservoir of water/steam at the top end of the water tubes. The drum stores the steam generated in the water tubes and acts as a phase-separator for the steam/water mixture.

What are the types of boiler water level gauge glass?

• Reflex level gauge.
• Transparent level gauge.
• Magnetic type level gauge.

What is boiler blowdown rate?

Rate of blowdown is a rate normally expressed as a percentage of the water feed. In the case of boilers, rate of blowdown is the removal rate of water from a boiler. Its purpose is to control boiler water parameters within prescribed limits to minimize: Scale. Corrosion.

How is blowdown rate calculated?

The optimum blowdown rate is determined by various factors including the boiler type, operating pressure, water treatment, and quality of makeup water. Blowdown rates typically range from 4% to 8% of boiler feedwater flow rate, but can be as high as 10% when makeup water has a high solids content.

What is BDV valve?

A blowdown valve (BDV) is a type of shutdown valve designed to depressurize a pressure vessel by directing vapour to a flare, vent or blowdown stack in an emergency. BDVs fail-safe to the open position upon failure of the control system.

How long does it take to purge a boiler?

Bleeding The Boiler Set radiator to the maximum heat setting and ensure the boiler begins to circulate water. Leave the boiler at the setting for at least fifteen minutes.

What causes high CO readings on boiler?

If the oxygen level is set too low and something changes the combustion process can become ‘fuel rich’ as there is insufficient oxygen for all the fuel to burn. This can cause high levels of CO to be generated and in the extreme enough fuel to enter the boilers flue and ignite (explode) outside the combustion chamber.

Why mountings are essential in boiler?

Boiler mountings are a set of safety device installed for the safe operation of a boiler. … These equipment save the boiler from damage due to extreme pressure, steam back flow, shell collapse due to vacuum, unregulated steam pressure, low water level, back flow of feed water to the pump and dry running respectively.

What causes soot?

Soot is a byproduct of burning fossil fuels, particularly coal. It is emitted by a variety of sources, including burning coal for electricity or industrial fuel, manufacturing, oil refining, and motor vehicles. Soot is released into the air as either extremely small particles or liquid droplets.

Why do we need superheater?

A superheater is a vital part of the a boiler system that is used to increase the overall efficiency of a thermal power plant. More specifically, it is a device which converts wet steam (saturated steam) into dry steam as dry steam contains more thermal energy.

Which boiler is best for fluctuating demand of steam?

A.Lancashire boiler is a fire tube boiler.C.Babcock and Wilcox boiler is a water tube boiler.D.all of the above

What is the difference between boiler and super heater?

It is different from a boiler in a way that, boiler utilizes both sensible heat as well as latent heat to convert water into steam while superheater utilizes only sensible heat to superheat the steam in order to increase its enthalpy.

What is the importance of EGB on board the ship?

An Exhaust Gas Boiler is a type of heat recovering system on ships which allows the exhaust heat of the main engine to produce steam while going out in the atmosphere. Every system, which is operated at high temperature, always has a risk of fire.

What is automatic feed water regulator?

Automatic feed water regulating apparatus for steam boilers comprising, a ring-shaped tube, a container surrounding a portion of the ringshaped tube and receiving water and steam from the boiler, an evaporable liquid within said ringshaped tube adapted to be heated by the boiler water and the boiler steam present in …

What are the 3 types of boilers?

There are three main types of boilers you can install into your home: combi boilers, heat only (regular boilers) and system boilers.

What are the advantages of water tube boilers?

• They have a small water content, and therefore respond rapidly to load change and heat input.
• The small diameter tubes and steam drum mean that much higher steam pressures can be tolerated, and up to 160 bar may be used in power stations.

Why is it called water tube boiler?

A water tube boiler is such kind of boiler where the water is heated inside tubes and the hot gasses surround them. This is the basic definition of water tube boiler. Actually this boiler is just opposite of fire tube boiler where hot gasses are passed through tubes which are surrounded by water.