Water tube Boiler (Construction and Working)

Water tube Boiler (Construction and Working)

1. Prof . Avesahemad S. N. Husainy Assistant Professor, Department of Mechanical Engineering Member of ISHRAE and ASHRAE Applied Thermodynamics I Unit No 2 Water Tube Boiler (Lecture 3) https://www.youtube.com/channel/UCPVNu2txpcsFU2eZf0DPRsg Sharad Institute of Technology College of Engineering , Yadrav ( Ichalkaranji ) NAAC ‘A’ grade accredited institute, NBA accredited programs, An ISO 9001:2015 accredited institute. 20/06/2020 ASNH 1

2. 20/06/2020 ASNH 2 In the water tube boiler, boiler feed water flows through the pipes into the drum. The circulated water is heated by the combustion gas to form steam in the steam area in the drum. A very modern water tube boiler designed with a steam capacity between 4,500-12,000 kg / hour, with very high pressure.

3. 20/06/2020 ASNH 3 Characteristics of water tube boiler: Forced, induced and balanced drafts help to improve combustion efficiency Less tolerant of the quality of water produced from a water treatment plant. So that water must be conditioned on minerals and other substances that are soluble in water Allows for higher levels of heat efficiency This boiler is used for the needs of very high steam pressures such as in power plants. Steam capacity between 4,500-12,000 kg / hour with very high pressure. Using oil and gas fuel for boiler water tubes assembled from the factory Using solid fuel for boiler water tubes that are not assembled at the factory.

4. 20/06/2020 ASNH 4 Steam and water drum (boiler shell): One half of the drum which is horizontal is filled up with water and steam remains on the other half. It is about 8 meters in length and 2 meter in diameter. Water tubes: Water tubes are placed between the drum and furnace in an inclined position (at an angle of 10 to 15 degree) to promote water circulation. These tubes are connected to the uptake-header and the down-comer as shown. Uptake-header and down-corner (or downtake -header) The drum is connected at one end to the uptake-header by short tubes and at the other end to the down-corner by long tubes. Grate:  Coal is fed to the grate through the fire door. Furnace :  Furnace is kept below the uptake-header. Baffles:  The fire-brick baffles, two in number, are provided to deflect the hot flue gases. Superheater :  The boiler is fitted with a superheater tube which is placed just under the drum and above the water tubes Basic Parts of Water Tube Boiler

5. 20/06/2020 ASNH 5 1. Babcock and Wilcox Boiler

6. 20/06/2020 ASNH 6 2. Stirling boiler

7. 20/06/2020 ASNH 7 D Type Boiler

8. 20/06/2020 ASNH 8 Advantages of Water Tube Boiler:  Operation : Operating a Water Tube Boiler is safe and easy. Hitting Surface: It has more hitting surface and has many water tubes that heat the feed water. Work Efficiency: This boiler has great work efficiency. We can control its heating process by controlling the amount of water supply in the water tube. Small Steam Drum: This type of boiler has a small size steam drum. For this reason, we can use the generated steam at the pressure from 40 kg to 140kg/cm. Flue GAS: In Water Tube Boiler flue GAS flows vertically. Movement: It is easy to mover Water Tube Boiler from one place to another place. Space: This Boiler required less space for installation . Disadvantages of Water Tube Boiler: Water Tube Damage: Boiler Tube can be damaged if there is any dust in the feed water. Because it blocks the water circulation. The deposition of salt and sediments in the inner surface of the Water Tube is a common problem for this type of boiler. Water Level: Water Tube Boiler uses less water and for this reason, the water level needs to check randomly. A makeup water pump is used for supplying the necessary water. Maintenance: Maintenance Cost for this boiler is high.

9. 20/06/2020 ASNH 9 Perform-Reform-Transform