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This type of blow down is common in high-pressure boilers. a large diameter line is opened for a short period of time. This flash steam can be used for pre-heating boiler feed water or for any other purpose. Also. Even though large quantities of heat are wasted. Blow down is necessary to protect the surfaces of the heat exchanger in the boiler.

Third Semester B. Tech (Mechanical Engineering) Thermodynamics SHORT QUESTION 1. Define Atoms and molecule. Mention Atomic Mass and Molecular Mass. 2. Write a short note on High Pressure Boilers. 3. What do you mean by Dead Weight Safety Valve and Leaver Safety Valve? 4. Define Pressure Gauge. 5.

The minimum capacity of any closed vessel which generates steam under Indian Boilers Regulation Act is ___. a) 2.275 liters b) 22.75 kilo liters c) 227.5 liters d) 22.75 liters 2. Steam is preferred medium for heating applications because: a) high latent heat b) temperature break down is easy c) Easy to control and distribute d) all the above 3.

A thermal power station is a power station in which heat energy is converted to electric power. In most of the places in the world the turbine is steam -driven. Water is heated, turns into steam and spins a steam turbine which drives an electrical generator .

A thermal power station is a power station in which heat energy is converted to electric power. In most of the places in the world the turbine is steam -driven. Water is heated, turns into steam and spins a steam turbine which drives an electrical generator .

2. Boilers 2. BOILERS Syllabus Boilers: Types, Combustion in boilers, Performances evaluation, Analysis of losses, Feed water treatment, Blow down, Energy conservation opportunities. 2.1 Introduction A boiler is an enclosed vessel that provides a means for combustion heat to be transferred into water until it becomes heated water or steam.

1. Explain the constructional difference between high pressure and low pressure. Why force circulation is necessary for high pressure boiler? [What are the features / characteristics of high pressure boiler?List out the major advantages of high pressure boilers in modern thermal power plants.] 2. * Write a short note on Benson boiler. 3.

Reset the high-limit control and put the boiler back into operation. Testing Pressure and Temperature Limit Controls. The pressure limit control of low-pressure heating boilers should open the burner circuit at not more than 15 psig and the temperature limit control at a temperature not exceeding 250°F.

(c) The flame safeguard requirements for high pressure boilers should be the same as they are for low pressure boilers (see Code Rule 4, Subparts 4-9, 4-10, 4-11 and 4-12 of this Part). back Historical Note

high pressure boilers ? (c) Write a short note on any one of the following: (a) Priming and Foaming (b) Phosphate Conditioning. UNIT-II Q4 (a) Define ‘Knocking ‘ and Octane number of gasoline (b) Name the factor assessed in proximate and ultimate analysis of coal

This type of valve is used to keep the boiler safe by controlling the working pressure in the boiler and resist the blasting due to the high pressure; the valve is mounted with boiler. Stop valve. This type of valve is used to control the flow of steam from the boiler to the engine.