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Anti-Icing in Gas Turbines

Sammak, Majed (2006)
Department of Energy Sciences
Abstract
This thesis gives a thorough description of the icing mechanisms in gas turbines, the

underlying physics of ice and ice types that can form in gas turbines. The primary intention of

this thesis is to investigate the icing condition regions leading to ice formation in gas turbines.

The icing problem in gas turbines is explained in detail in this thesis. The different ice

types, icing mechanism in gas turbines and ambient conditions leading to icing are reported.

Ambient factors and other factors that can affect icing conditions are also discussed. The icing

conditions have been investigated for different air velocities in the inlet system of the gas turbine

and with various ambient conditions. A recovery factor has been used in the... (More)
This thesis gives a thorough description of the icing mechanisms in gas turbines, the

underlying physics of ice and ice types that can form in gas turbines. The primary intention of

this thesis is to investigate the icing condition regions leading to ice formation in gas turbines.

The icing problem in gas turbines is explained in detail in this thesis. The different ice

types, icing mechanism in gas turbines and ambient conditions leading to icing are reported.

Ambient factors and other factors that can affect icing conditions are also discussed. The icing

conditions have been investigated for different air velocities in the inlet system of the gas turbine

and with various ambient conditions. A recovery factor has been used in the calculations of icing

conditions. The recovery factor gives the icing surface temperature which lies between the air

static temperature and air total temperature. The recovery factor differs from laminar till turbulent

flow. The experimental value 0, 8 is taken in the calculations. Ice formation locations in the gas

turbines? inlet systems are also covered. My study to the icing mechanism in gas turbines shows

that there is no hazard for icing when air velocity is very high because of great air temperature

depression. Furthermore, as long as the surface temperature is above the water saturation

temperature, condensation will not occur and ice will not form even if the surface temperature is

below freezing point temperature. The highest risk of ice building lies specifically between the

highest and lowest velocity, in contrast to what was believed earlier that the risk lied at highest

velocity.

A possible solution to the icing problem in gas turbines is also presented in this thesis.

The different anti icing systems that can protect the gas turbine is investigated. I focused mainly

on the compressor bleed heating system and hot water heat exchanger system in my calculations.

The heat power that is needed to warm up the incoming air to the gas turbine has been calculated

for two Siemens gas turbines; SGT-700 that is using the compressor bleeds anti-icing system and

SGT-800 that is using a water heat exchanger anti-icing system. The results show that the

compressor bleed anti-icing system has a larger influence on gas turbine performance than the hot

water heat exchanger. The pulse jet self cleaning filter is also mentioned in this part to explain

why pulse filter has been used as an anti-icing system. (Less)
Please use this url to cite or link to this publication:
author
Sammak, Majed
supervisor
organization
year
type
H1 - Master's Degree (One Year)
subject
keywords
icing mechanisms, ice, icing problems, Energy research, Energiforskning
language
English
id
1327416
date added to LUP
2006-07-05
date last changed
2006-07-05
@misc{1327416,
  abstract     = {This thesis gives a thorough description of the icing mechanisms in gas turbines, the

underlying physics of ice and ice types that can form in gas turbines. The primary intention of

this thesis is to investigate the icing condition regions leading to ice formation in gas turbines.

The icing problem in gas turbines is explained in detail in this thesis. The different ice

types, icing mechanism in gas turbines and ambient conditions leading to icing are reported.

Ambient factors and other factors that can affect icing conditions are also discussed. The icing

conditions have been investigated for different air velocities in the inlet system of the gas turbine

and with various ambient conditions. A recovery factor has been used in the calculations of icing

conditions. The recovery factor gives the icing surface temperature which lies between the air

static temperature and air total temperature. The recovery factor differs from laminar till turbulent

flow. The experimental value 0, 8 is taken in the calculations. Ice formation locations in the gas

turbines? inlet systems are also covered. My study to the icing mechanism in gas turbines shows

that there is no hazard for icing when air velocity is very high because of great air temperature

depression. Furthermore, as long as the surface temperature is above the water saturation

temperature, condensation will not occur and ice will not form even if the surface temperature is

below freezing point temperature. The highest risk of ice building lies specifically between the

highest and lowest velocity, in contrast to what was believed earlier that the risk lied at highest

velocity.

A possible solution to the icing problem in gas turbines is also presented in this thesis.

The different anti icing systems that can protect the gas turbine is investigated. I focused mainly

on the compressor bleed heating system and hot water heat exchanger system in my calculations.

The heat power that is needed to warm up the incoming air to the gas turbine has been calculated

for two Siemens gas turbines; SGT-700 that is using the compressor bleeds anti-icing system and

SGT-800 that is using a water heat exchanger anti-icing system. The results show that the

compressor bleed anti-icing system has a larger influence on gas turbine performance than the hot

water heat exchanger. The pulse jet self cleaning filter is also mentioned in this part to explain

why pulse filter has been used as an anti-icing system.},
  author       = {Sammak, Majed},
  keyword      = {icing mechanisms,ice,icing problems,Energy research,Energiforskning},
  language     = {eng},
  note         = {Student Paper},
  title        = {Anti-Icing in Gas Turbines},
  year         = {2006},
}