The "Thirteenth Five-Year Plan" pointed out that promoting central heating, gradually replacing small coal-fired boilers, and reducing coal-fired environmental pollution. The heating industry is not only a public welfare industry, but also a people's livelihood project, which is directly related to the quality of life of the masses and has an important impact on the improvement of urban ecology. Central heating is often used in northern cities, and thermal power plants deliver hot gas to thousands of households through thermal pipelines. Usually, in order not to affect the traffic and city appearance, the heating pipes are laid underground. Even with good thermal insulation measures, the heat loss still accounts for 5%-8% of the total input heat. For steam pipes with higher temperatures, the heat loss bigger. Therefore, the improvement of thermal insulation performance of heating pipes has become an important indicator affecting the efficiency of the heating pipe network system, and it is also one of the goals of energy saving and emission reduction.
The thermal insulation materials used in traditional thermal insulation pipes include rock wool, glass wool, calcium silicate tiles, polyurethane foam, etc. The thermal conductivity is between 0.03-0.06W/(m·K), the cost is low, but the compression resistance is poor , It is easy to be deformed by external effects, and it is thermally expanded in the process of thermal operation. After long-term operation, the thermal insulation performance decreases. Aerogel thermal insulation material, the thermal conductivity is close to that of air, reaching 0.02W/(m·K), which can not only effectively improve the thermal insulation performance of the thermal pipeline, but also improve the quality stability of the thermal pipeline, reduce the overall construction period, and save energy. Coal resources, improve heating quality, reduce environmental pollution, etc. have positive significance.
In addition, in the pipeline design of the chemical industry, the thermal insulation and heat tracing of the pipeline also occur frequently, especially in the chemical enterprises in the alpine region, under the harsh climate conditions, the liquid pipe is prone to freeze cracking. The medium flows in the pipeline, and the temperature gradually decreases along the process due to the existence of heat dissipation losses. In the case of general heat loss, the temperature of the medium usually does not drop to the freezing point or freezing point, but when the medium in the tube stops flowing, without heat supplement, the temperature may drop to the freezing point or freezing point, resulting in freezing. Blocking the pipeline will lead to the rupture of the pipeline, resulting in significant economic losses. The traditional pipeline insulation materials in the chemical industry have a short service life and rapid thermal insulation performance loss, so they need to be replaced frequently, and each update needs to stagnate for several days of production time. loss. Some chemical industries have special requirements and restrictions (such as explosion-proof, heat insulation, etc.) along with the leakage risk of toxic gases and flammable and explosive gases. Among the substances transported in pipelines, some wastewater contains a large amount of toxic and refractory pollution. Leakage will cause serious damage to the ecological environment. Compared with traditional materials, aerogel materials have low thermal conductivity and strong tensile and compressive strength, which is convenient for thermal insulation construction and application, has a life span of up to 10 years, saves space, and greatly reduces transportation costs and pipeline loads. Colleagues, with good hydrophobicity, it can effectively keep the original thermal insulation structure from sinking, mildew and decay. It is a new generation in the field of pipeline energy saving that replaces traditional materials.
Thermal insulation: low thermal conductivity ≤0.02W/(m·K), excellent thermal insulation performance, which can greatly reduce heat loss;
Cost saving: low density, thickness is only 1/5 of traditional materials, greatly reducing pipeline laying, transportation and installation costs;
Fireproof and hydrophobic: A1 grade non-combustible standard, water repellency rate N98%, to prevent moisture from entering the inside of the pipeline and causing corrosion;
Strong compressive resistance: good flexibility, tensile and compressive strength, no settlement or deformation after long-term use;
Durable: small performance loss, sustainable use for more than 10 years;
Convenient construction: light in weight, convenient in cutting and processing, and can adapt to various pipe designs of different shapes.
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