Top Banner
Chimney & Cooling Towers -GET Induction Meeting at H.O- 22.07.2011
39
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Page 1: Chimneys

Chimney & Cooling Towers-GET Induction Meeting at H.O-

22.07.2011

Page 2: Chimneys

275Mtrs - Single Flue Brick Lining Chimney Bellary

Ukai

Page 3: Chimneys

275Mtrs - Double Flue Steel Chimney

Attipatu

Korba

Page 4: Chimneys

• INDIA has been striving to alleviate the electric power crisis, recently aggravated due to the economic boom in the country.

• Out of the two major sources of power, i.e. Hydro Power and Thermal Power, the latter has become more popular due to its adaptability towards larger production capability.

• Thermal power is obtained through burning coal, which is required to operate the steam boilers.

• When burnt, the coal produces polluting gases that need to be discharged at an elevation high enough to dilute the pollution and to keep it within acceptable limits at ground level.

• An adequately designed tall chimney serves this purpose.

What/Why/where - Chimney

Page 5: Chimneys

• As the pollution norms have become stringent with time, the chimney heights have gone up progressively from 100m to 150m to 220m to 275m.

• In most thermal power plants, 275m tall concrete chimneys have now become the standard norm.

• It may be worthwhile mentioning here that a bi-product of burning of coal is fly ash, which is produced in the process line between boiler and chimney.

• This fly ash is extracted using electrostatic precipitators, which incidentally can be used in blended cement and as mineral admixture in concrete.

Page 6: Chimneys

Chimney Construction

• Excavation - ____ ____Cum• Raft - ________ Cum• Shell -_________Cum• Structural Erection - _________MT

Page 7: Chimneys
Page 8: Chimneys
Page 9: Chimneys

Top view of Raft Foundation

43 Mtrs

11 Mtrs

Chimney Raft

Page 10: Chimneys

The purpose of this work is to provide uniform, pre-defined and well defined method for the construction of RCC chimney.

Slip formwork system is a system in which slip forms are continuously raised by hydraulic equipment. By this means the rising from 150 to 300 mm per hour depending on the concrete hardening rate as the cast concrete can become self-supporting very rapidly.

Shell Construction by Slipform Technology

Page 11: Chimneys

• The system uses steel panels of special height, which are fixed to working carcass consisting of steel

frames (yokes), trusses and fixing devices.• Carcass provide stability of the system design and is a reliable base for the wooden

flooring used as a working platform for placement of concrete, reinforcement and embedded parts for doors and windows on its surface.

• A hydraulic jack is placed on the top of each frame. • A high tensile steel jacking rod is passed through the jack and is casted into the walls as

it rises.• The jack consists of a cylinder and a pair of upper and lower clamp mechanisms

gripping the rod and working in cycles. • The principle is that the jack works against the lower clamp to lift the frame.• When the pressure is released upper clamp grips the rod and the lower clamp is

released and come up by spring action.

Page 12: Chimneys

• Large capacity jacks are usually used with steel tubes of big diameters and greater stiffness.

• Concreting with slip formwork can be carried out on a continuous basis, 24 hours a day, or with

intervals, to be exact, the concrete is poured on up to a predetermined height usually within one day.

• Vertical reinforcement is retained in the correct position using guides, which are fixed on the top of the frames.

• Horizontal reinforcement is laid under the frames and is bounded with the vertical reinforcement.

• Inserts for doors and windows can be made of wood and steel. They are set during the lifting process and removed in the end.

Page 13: Chimneys
Page 14: Chimneys
Page 15: Chimneys
Page 16: Chimneys
Page 17: Chimneys
Page 18: Chimneys
Page 19: Chimneys
Page 20: Chimneys
Page 21: Chimneys
Page 22: Chimneys
Page 23: Chimneys
Page 24: Chimneys
Page 25: Chimneys

Checks conducted in chimneys:

1.Verticality

2. Wall thickness

3. Centering and twisting

4. Radius

5. Curing

Verticality Check:• Verticality is checked by

calibrated laser beam.• Tolerance 1 / 1000mm

0r 75 mm maximum.

TARGET PLATE

Page 26: Chimneys

Shell wall thickness:• Chimney shell Wall thickness is measured with tape at every yoke between shuttering plates

for every lift. • Tolerance of wall thickness (-)5mm and (+)25mm.

Page 27: Chimneys

Twist:

• The 2 no's of Twist plate is fixed on slipform before starting of operation .

• Twisting is checked every one meter of concreting, if twist observed it will be control opposite force direction given by storing reinforcement or leveling of slip form.

Page 28: Chimneys

Radius Checking:

Radius is to be checked with center point and inside wall shuttering with measuring

tapes . The tolerance of radius is +/- 25mm.

Page 29: Chimneys

List of Executed Projects

• Chimneys • Cooling Towers

Page 30: Chimneys

List of Executing Projects

• Chimneys • Cooling Towers

Page 31: Chimneys

LANCO KONDAPALLI POWER PRIVATE Ltd

Page 32: Chimneys

LANCO AMARKANTAK POWER PROJECT LTD

Page 33: Chimneys

LANCO UDIPI POWER CORPORATION LIMITED

Page 34: Chimneys

LANCO ANPARA THERMAL POWER PLANT

Page 35: Chimneys
Page 36: Chimneys
Page 37: Chimneys
Page 38: Chimneys

A.Ghosh- GM –ProjectsG.K.Singhi- Sr.DGM – ProjectsTushar Padmawar – Dy. ManagerRobin – Asst. ManagerKarthik Bysani – EngineerNarendar – EngineerLakhsmi – MT

Page 39: Chimneys

Construction | Power | Infrastructure | EPC | Property Development | Wind Energy | CSR

Thank YouByChimney & CT Team

A.Ghosh- GM –ProjectsG.K.Singhi- Sr.DGM – ProjectsTushar Padmawar – Dy.Manager