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Aerogel Insulation Materials in LNG Pipeline Application
2017-12-07 15:15:40       From: Tradematt-Aerogel

 

LNG insulation status


In the construction of LNG projects and other low-temperature projects, the temperatures involved in low-temperature and ultra-low-temperature equipment are mostly between -40 and -170 degrees Celsius. The most commonly used cryogenic cold-retaining materials are mainly PUR / PIR, foam glass, rubber, modified phenolic foam, these materials compared to the previously used perlite materials, both in terms of performance and construction have a very Great improvement. The effect of cold insulation is not only related to the efficiency of the entire equipment delivery, but also the safety of the device also has a crucial impact. The right cold insulation material can not only reduce the energy consumption, reduce the cold loss, but also meet the requirements of environmental protection, providing safeguards for enterprise safety and creating better benefits. Aerogel insulation material appears, it seems precisely for this cryogenic insulation and tailor-made at home and abroad have begun to be widely used.
At present, most of the LNG transmission pipeline cold preservation projects in our country are not very satisfactory.
 
The main defects and causes are as follows:
● traditional materials, decay heat insulation quickly, resulting in high maintenance costs.
● Traditional cold-proofing effect is poor, cold loss, easy to natural gas or other compressed gas storage and transportation hazards.
● Traditional material package thickness, to the dense pipeline layout design brings a lot of inconvenience.
● Pipelines are easily corroded by dewatered water due to poor cooling effect.
● cold layer is easy to lose the effect of too much dew.
● Organic materials waterproof but can not meet the fire safety requirements.
 
Aerogel Insulation material benefits
 
● excellent cooling effect, the room temperature thermal conductivity is only 0.016W / m * k, ultra-low temperature thermal conductivity <0.01W / m * k, the required cooling layer thickness is greatly reduced, effectively reduce the cold loss for the dense pipeline layout design Provide optimization.
● has the best low temperature stability, -200 ℃ can still maintain long-term cold performance and good flexibility, no cracking.
● Excellent dimensional stability, nano-special structure can resist the stress caused by telescopic pipe, without the need to set expansion joints.
● Aerogels have good water repellency, which can effectively inhibit the infiltration of water into the metal pipelines and prevent corrosion of the pipelines, and prevent the heat insulating materials from decreasing due to seepage.
● material is inorganic material, the main component of SiO2, non-adhesive, stable performance, fire safety, longer service life.
● material cutting, construction convenience, low maintenance costs.
lngcoolinsulation3.jpg
 
Aerogel Insulation Mterials Contrast with the concrete performance of better cold preservation material nowadays:
 
  aerogel insulation blanket Foam glass PIR
Thermal Conductivity,W/(m•K)(25℃) 0.014~0.016 0.045~0.055 0.022~0.026
density,kg/m3 180 180~240 50~80
cold insulation thickness About 1/2 of traditional materials --- ---
energy saving effect Save 30% on cold loss and BOG --- ---
Water absorption(vol%) 0.36 0.5 1.5
Hydrophobic rate ≥99% --- ---
Construction Roll coil, flexible, easy construction Very poor, high loss, shaped parts still need internal polyurethane foam Ordinary, field foaming, but poor foam uniformity
Low temperature stability excellent excellent Easy to aging, lower strength, poor stability
Dimensional stability 0.45% poor poor
Expansion joints No need to set, reduce the risk of system failure set, to prevent the pipe material due to low temperature displacement of extrusion, broken set, to prevent the pipe material due to low temperature displacement of extrusion, broken
Protect pipes against mechanical impact Compression, tensile, crack, resist brutal construction Poor, fragile material brittle Poor, fragile material brittle
Reuse Disassembly and maintenance, can be reused Fragile disassembly, can not be used Fragile disassembly, can not be used
Other Reduce the cost of auxiliary materials by 25%, reduce the size of the workshop or pipe gallery, and reduce the difficulty of pipeline arrangement. --- -----
 

 Aerogel Insulation blanket Insulation Program and Economic Benefits:

Take the LNG pipeline with a pipe diameter of 108mm (straight pipe section) as an example, the thickness of the aerogel and the traditional insulation materials, the cooling effect and the economic benefits are analyzed as follows:

 Aerogel Insulation blanket Cool insulation program

 

lngcoolinsulation2.jpg

Aerogels insulation materials as a thermal insulation material, the outer layer of aluminum foil to reduce heat radiation, thermal insulation layer with a color steel plate for protection.

Insulation material thickness in the table below:

Aerogel Insulation :10mm×4 layers + Aluminum foil

Traditional materials :PIR 80mm + Aluminum foil

Test environment: ambient temperature 35 ℃, humidity 60%.

 

Construction diagram can refer to the following figure:

 

aerogel construction.jpg