Answer: Answer: There are different types of composite boilers. Normally one part of the boiler is heated by means of a fuel oil burner and the other part is heated by the exhaust gases from a diesel engine. Heating of one part of a boiler at the time often causes thermal stress that may lead to leakage.
According to the contents in the tube,steam boiler is two types. 1. Fire tube or smoke tube boiler . 2. Water tube boiler. When hot gases and flames are passed through the tubes or multi-tubes which are surrounded by water, is called fire tube or smoke tube boiler.It is very simple small capacity type boiler and is used various industries for it's simplicity.
TYPES OF BOILERS. Auxiliary boilers on Navy ships may be divided into two groups: FIRE-TUBE BOILERS and WATER-TUBE BOILERS. Fire-Tube Boilers. Fire-tube boilers are generally similar to Scotch marine or locomotive boilers. In this type of boiler, the gases of combustion pass through tubes that are surrounded by water. There are a number of auxiliary boilers of the fire-tube type in use in diesel-driven ships.
Formation of marine boiler. On a diesel main machinery vessel, a smaller (usually firetube type) boiler will be fitted to provide steam for the various ship services. Even within the two basic design types, watertube and firetube, a variety of designs and variations exist.
For further information about the different types of corrosion check the following web pages: Galvanic corrosion; Caustic corrosion; Acidic corrosion; Hydrogen embrittlement; Oxygen attack; Carbon dioxide attack; Protection of steel in a boiler system depends on temperature, pH, and oxygen content.
Types of Scotch Marine Boiler. The following are the main two types of Scotch Marine Boiler: Single-ended Scotch marine boiler; Double-ended Scotch marine boiler; 1. Single-Ended Scotch Marine Boiler. In this boiler, it consists of a circular boiler shell of large diameter and a short length. The single-ended scotch boiler has a length of up to 3.5 meters.
Jan 15, 2019 · There are two types of boilers are used in sub critical, super critical and ultra-super critical coal fired thermal power plant: Pulverized coal-fired Boiler; Fluidized Bed combustion (FBC) boiler; Note: Both types of boiler are water tube boiler. Pulverized coal-fired Boiler or Pulverized fuel Boiler
Nov 25, 2019 · On the other hand in water tube boilers, the water flows inside the tubes and the heat surrounds these tubes. Generally we use the water tube boiler in order to generate the super heated steam like on steam ships etc. the pressure generated on water tubes is always higher the smoke type of boilers.
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The main two basic boilers are: Water tube boiler. Fire tube boiler.
Marine boilers are of two types namely the water tube boiler and the fire tube boiler. The water tube type boiler is used for high-pressure, high-temperature, high-capacity applications. The Main boiler design depends on its application, ie. for motor ships, a small fire tube boiler would be satisfactory.
Jun 08, 2016 · Usually there are two types of boilers on a ship,Auxiliary boiler and Exhaust boiler. Sometimes there are composite boilers, standard cargo ships have water tube boilers. The auxiliary boiler on a ship is the one which operates on diesel/furnace o
Jan 16, 2016 · Today we will discuss about types of boilers used in industries. A boiler may be defined as a closed vessel in which steam is produced from water by combustion of fuel. Boiler is used in many industries such as in steam power generation, in sugar industries, in textile industries for sizing and bleaching etc. and in many other chemical industries.
Water tube boilerEdit. This type of boiler is generally preferred in high pressure applications since the high pressure water/steam is contained within narrow pipes which can contain the pressure with a thinner wall. It can however be susceptible to damage by vibration in surface transport appliances.
Boiler Types and Classifications. There are two general types of boilers: ''fire-tube'' and ''water-tube''. Boilers are classified as "high-pressure" or "low-pressure" and "steam boiler" or "hot water boiler." Boilers that operate higher than 15 psig are called "high-pressure" boilers. A hot water boiler, strictly speaking, is not a boiler.
Sep 28, 2013 · It has higher thermal efficiency compared to other types boilers. 6. Dry bottom furnace . Slag type or wet bottom type , Oil fired furnace . 7. Boiler drum is the secondary part of the boiler where the water absorb the heat and converted into the stream ,that steam send to the turbine after reheating by the super-heater . 8.
There are also a large number of boilers that run on gas and/or oil. Of course, within this group of boilers, there are distinctions among fuel types. Natural gas, propane and #2 fuel oil are the most prevalent. Finally, some boilers forsake the more traditional types of fuel altogether in favor of biomass.
The types of atomizers used on ships are straight mechanical, steam, and vented plunger, as described below. In straight mechanical atomization, all the oil pumped to the atomizer is sprayed into the furnace. The firing rate of this type of burner is controlled by varying the supply fuel oil pressure and changing sprayer plate sizes.
Aug 22, 2018 · There are mainly two types of boiler – water tube boiler and fire tube boiler. In fire tube boiler, there are numbers of tubes through which hot gases are passed and water surrounds these tubes. Water tube boiler is reverse of the fire tube boiler. In water tube boiler the water is heated inside tubes and hot gasses surround these tubes.
Watertube boiler: O type. FUELS: NATURAL GAS, BIO GAS, OFF-GASSES OR #2 - #6 OIL For more information on O type watertube boilers, or to discuss your specific steam plant needs, contact the experts at Industrial Boiler & Mechanical. We provide everything you need including watertube boiler and auxiliary equipment sales, installation and startup,
One chemical group for boilers is for steam boilers and the second is for hot water boilers. Steam Boiler Chemicals - These include Oxygen Scavengers, Amines, Phosphates, Polymers, and Alkalinity Builders. Oxygen Scavengers - Most common type is 38%, pH < 4. Other solutions come blended with a cobalt catalyst and alkalinity contributors.
Types of Pumps Used Onboard Ship February 2, 2017 February 9, 2017 Harshal P. Patil Marine Auxiliary Machine A Pump is a machine used to raise liquids from a low point to a high point.
A combination or ‘combi’ boiler is both a high efficiency water heater and a central heating boiler in a single compact unit. Combi boilers heat water directly from the mains when you turn on a tap, so you won’t need a hot water storage cylinder or a cold water storage tank in the roof space.
The pressure vessel of a boiler is usually made of steel (or alloy steel), or historically of wrought iron. Stainless steel, especially of the austenitic types, is not used in wetted parts of boilers due to corrosion and stress corrosion cracking.
Different types of boilers auxiliaries and fittings include safety valves, boiler fuel oil pumps, heaters and filters, oil burners, feed check and control valves. The marine boiler supplies superheated steam to the main turbines, and de-superheated steam to the auxiliary turbines, heaters both in the engineroom and accommodation, also steam to deck for winches and galley use.
Generally on boilers used on ship two safety valves are fitted. These safety valves are o/hauled in dry-dock and set to open at 3% more than the max allowable pressure, in presence of a surveyor. In case of economiser safety valves the valves are set by the chief engineer at sea and the surveyor is informed.
There are two types: Fire tube boilers. water tube boilers.
Jan 16, 2016 · Boiler may be classified in following types. According to the axis of boiler. 1. Horizontal boiler: If the axis of boiler is horizontal, it is known as horizontal boiler. Example Babcock and Wilcox boiler 2. Vertical boiler: If the axis of boiler is vertical, it is known as vertical boiler. The main advantages of vertical boiler that it is easy to maintain.
The boilers are fitted with different safeties as the steam pressure is up to 8 bars in most cases. There are normally two kinds of boilers on ships, Auxiliary and Exhaust, some ships have composite boilers. Boiler are of two type. STB (Smoke tube Boiler) or donkey boiler. WTB (Water tube Boiler) or High pressure boiler.
Understanding the basics is the key to properly plan the maintenance and troubleshoot the marine boiler. This guide describes the main types of marine boilers commonly used on ships, along with their working procedures and problems. Each important part of the boiler system is explained with important procedures and guidelines.
Steam Propulsion. All D-type boilers are designated as uncontrolled superheat boilers because all the steam generated by the boiler must pass through the superheater. Superheater outlet temperature is a result of the combustion gas flow in proportion to the total amount of steam flow through all ranges (0 - 120%).
Fire Tube Boilers. Also referred to as smoke tube boilers, shell boilers, package boilers Multiple gas paths - 2, 3 and 4 pass Internal furnace or fire box as the 1st pass Dry back or wet back design Single fuel or dual fuel design Little or no steam separation equipment.
D type water tube boiler. In the water tube boiler, the water and steam flow inside the tubes and the hot gases flow over the outside surfaces. Where as in fire tube boilers hot gases from combustion travels through the tubes. flue gases produced from furnace where fuel is burnt.
Nov 26, 2010 · There are two types of boiler mainly use in the Marine Industry, The water-tube boilers and the fire-tube boilers. The most common of which is the water-tube. In the water-tube type, water passes though lines of tube where it is heated by the used of a burner and a furnace. Free Chat
Various types of water level controls are used on boilers. At Seabee activities, boilers frequently are equipped with a float-operated type, a combination float and mercury switch type, or an electrode probe type of automatic water level control. Each of these types is described below.
Feb 22, 2017 · Boiler ,types of Boiler, how steam is produce in the boiler, fire tube boiler, water tube boiler, other types of boiler, advantages and disadvantages, and mu Skip navigation Sign in
Vanderbilt boiler An American design, similar to the Lentz and large launch-type boilers. Velox boiler: vertical boiler: flued or fire-tube designs where the main shell is a cylinder on a vertical axis, rather than horizontal. Boilers of this external form may have a great variety of internal arrangements.
Composite Boilers. The Cochran boiler whose working pressure is normally of the order of 7 bar is available in various types and arrangements, some of which are: Simple pass composite boilers, i.e., one pass of the exhaust gases and two uptakes, one for the oil fired system and one for exhaust system.
Nov 26, 2010 · There are two types of boiler mainly use in the Marine Industry, The water-tube boilers and the fire-tube boilers. The most common of which is the water-tube. In the water-tube type, water passes though lines of tube where it is heated by the used of a burner and a furnace.