Table of Contents
What is Draught and its types?
Draught is defined as the difference between absolute gas pressure at any point in a gas flow passage and the ambient (same elevation) atmospheric pressure.
What type of Draught is produced in this boiler?
Drafts are produced by the rising combustion gases in the stack, flue, or by mechanical means. For example, a blower can be put into four categories: natural, induced, balanced, and forced. Natural draft: When air or flue gases flow due to the difference in density of the hot flue gases and cooler ambient gases.
How are Draughts classified?
ADVERTISEMENTS: Classification of Boiler Draught: Natural, Artificial, Steam Jet and Mechanical. Draught may be defined as the small pressure difference which causes a flow of gas to take place. Proper combustion in a boiler furnace can only occur when sufficient quantity of air is supplied to the burning fuel.
What is the purpose of boiler Draught?
The draught is necessary to force air through the fuel bed/ grate to aid in proper combustion of fuel and to remove the products of combustion i.e. flue gases to the atmosphere after they have given their heat to water being evaporated in the boiler.
Which is not type of Draught?
Explanation: The draught produced is given by Δp = gH(ρa-ρg). 3. Which of these is not a type of mechanical draft system for a furnace? Explanation: The three types of mechanical drafts are balanced, induced and forced drafts.
Which type of Draught is used in locomotive boiler and why?
The gases are then lead to atmospheric through a chimney. An artificial steam jet draught is present in this boiler for increasing the heat transfer rate. Generally used in railway locomotive engines and in Submarines.
What is a natural Draught boiler?
A natural draft furnace is one that uses natural atmospheric pressure to force the waste gasses of combustion out through the ventilation system. Hot air naturally rises, lifting the combustion byproducts along with it.
What is chimney Draught?
Draught is the pressure difference which causes a flow of air or gases from one point to another point in the boiler system. To remove flue gases from the system after combustion and the heat exchange.
What is detail Draught?
The noun draught is pronounced exactly like draft, and it also shares most of the same meanings. A cold burst of wind, a swig or a serving of a drink, the act of pulling a heavy load, and the depth of a ship below the surface of the water: each of these can be called a draught.
What is purpose of Draught?
What are the purpose of Draught? To supply required amount of air to the furnace for the combustion of fuel. The amount of fuel can be burnt per square foot of grate depends upon the quantity of air circulated through fuel bed. To remove the gaseous products of combustion.
Which is most preferred type of Draught system?
Which is most preferred type of draught system? Explanation: A balanced draught system combines the features of forced draught and induced draught. In case of forced draught, when the furnace doors are opened high pressure air rushes outside and even blow out the fire entirely.
What is mechanical Draught?
It is a draft used in some gas burning appliances and cooling towers to remove flue or vent gases by mechanical means, such as a fan, which may include an induced draft portion under non−positive static pressure or a forced draft portion under positive static pressure.