Comparison of Nano Aerogel Insulation Materials with Traditional Materials
1. The Problems with Traditional Pipe Insulation Materials and the Advantages of Nano Aerogel Insulation Materials Solutions
1.1 Pipe vibration led to the traditional insulation material insulation weakened
Insulation properties of traditional inorganic insulation materials come from the millimeter-scale space formed between inorganic fibers. These spaces are filled with air. Under normal temperature, the air in these spaces has lower flow velocity and lower convection speed, but in high temperature environment In the air convection intensified traditional thermal conductivity of inorganic materials will rapidly increase.
More importantly, in the adiabatic structure of high-temperature steam pipe, the material of the soft fiber structure sinks due to the vibration of the pipe, resulting in the failure of the adiabatic structure. Subsidence, rupture and density increase of conventional insulation materials caused by low frequency vibration of pipes and the rapid increase of thermal conductivity of traditional inorganic materials under high temperature are the main reasons for the weakening or even failure of high-temperature steam pipe insulation.
The principle of heat insulation of nano-aerogel insulation material is very different from that of traditional inorganic heat-insulation material. The material is a perfect chemical bonding between aerogel and inorganic fiber in a special process. The aerogel mass is filled with space between fibers, Its excellent thermal insulation properties come from about 90% of the nanopores in the system (the vast majority of pore diameters are concentrated in the range of 20-50 nm which is far less than the free air path), and the extremely small nanopore enables a Which is similar to the "pseudo-vacuum" state of the vacuum. In this state, the thermal conductivity between the air molecules is weakened and the air thermal conductivity of the nano-aerogel insulation material is greatly reduced.
In addition, the nano-scale pore structure is extremely high in micro-strength and does not deform and break the micro-nano-pore structure under the surface pressure, which affects the adiabatic effect (the traditional material increases its thermal conductivity under pressure due to its increased density). Therefore, Gel insulation is a material that ignores the optimum heat transfer density. It is an excellent insulation with both low thermal conductivity and high structural strength.
Summary: Nano aerogels insulation materials with high tensile strength and ultra-low thermal conductivity, long-term alternating hot and cold vibration and low frequency conditions will not reduce its service life and thermal insulation capacity.
1.2 Insulation improper selection
The test results show that the thermal insulation structure made of soft materials such as aluminum silicate, rock wool, glass wool, slag wool and the like has the outstanding problem that the thickness of the thermal insulation material is extremely slippery and the sinking is serious, resulting in the thin insulation layer at the top of the pipeline , The bottom is very thick, loss of thermal insulation function, resulting in heat pipe top heat loss seriously exceeded the national standard. Although there is no above-mentioned defects in the micro-hole hard calcium silicate, the crack part of the hard heat-insulating material is hard to deal with, the gap of the seam increases after the thermal expansion and vibration of the high temperature pipe and the heat leakage in the crack part is serious, Large, adiabatic effect is not very good.
Nano aerogels insulation material that solves the traditional soft thermal insulation collapse defects, but also solve the hard material powder and cracks gap larger heat defects. The excellent properties of nano-aerogels insulation material determines its wide range of applications, can be said to be an alternative to traditional materials.
1.3 protective layer of poor quality, hydrophobic attenuation
Although the traditional thermal insulation materials are used to increase the hydrophobicity of the surface hydrophobic agent, but in poor natural conditions, the surface hydrophobic effect due to material expansion and pipe vibration will soon lose or weaken. Nano aerogels insulation materials, its hydrophobicity is the physical and physical properties of raw materials, no matter under any conditions, its hydrophobicity will not decay.