Catalytic flue gas turbine pipelines insulation replacement in CNPC Changqing Petrochemical Company

Number of visits: Date:2017-11-14

Customer Profile

CompanyCNPC Changqing Petrochemical Company

Project LocationCNPC Changqing Petrochemical Company

Equipment/pipelinePipelines of catalytic flue gas turbine

Operation Conditions

Pipeline diameter1524mm

Interior liquid temperature600

Wind speed1m/s

Pipeline length60m

Challenges

1, Difficult to install insulation materials because of the pipeline diameter, insulation materials need to be cut on site.

2, Insulation materials are difficult to be immobilized because nailing and drilling are prohibited on the surface of catalytic flue gas turbine.

3, Thermal bridges associated with pipe racks must be stopped in order to further minimized heat loss.

4, Maintenance is difficult for aerial pipelines.

Products

Aerogel blanket DRT061010mm thickness

Solution

7 layers of aerogel blanket DRT0610 with single-face aluminum foil, tightly wrapped with aluminum foil glass fiber fabric.

NotedGlass fiber fabric with single-face aluminum foil was applied in between every 2 layers of aerogel blanket to prevent heat leakage from the gaps.

Data Comparison

Insulation Solution

 

Aluminum silicate wool

Aerogel blanket

Pipeline diameter

mm

1524

1524

Interior liquid temperature

600

600

Ambient temperature

23.4

23.4

Wind speed

m/s

1

1

Thermal conductivity of insulation material

W/(m*℃

0.049

0.020

Thickness for insulation

mm

200

70

Surface temperature of insulation

97.5

44.7

Plus or minus

 

Cracks, collapse and heat leakage from gaps happen, uneven insulation structure

Even insulation structure, no heat leakage from gaps

 

Benefits

After applying aerogel insulation blankets, surface temperature is controlled below 50, with improvement of structural strength in insulation.

Compared with the same operation conditions with aluminum silicate wool, decrease of temperature drop of gas is around 2.

Pictures from Project Site

 

TypeInfo: Case Studies

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