Rosewool Insulation Refractory Co.,Ltd.
Why do power plants use aluminum silicate blanket insulation materials, and where are aluminum silicate blankets mainly used? The temperature in the boiler, main steam pipeline, and furnace outlet area of power plants mostly exceeds 600 ℃. Ordinary rock wool will quickly pulverize when it exceeds the operating temperature, while glass wool has lower temperature resistance and cannot meet high temperature conditions. Due to the ultra-high temperature of the steam turbine, general insulation materials are prone to pulverization. Aluminum silicate blanket, as an inner insulation material for high-temperature backing, is often used in combination with rock wool and calcium silicate board to solve the insulation problem in high-temperature areas, reduce heat and smoke leakage, extend the service life of the insulation layer, and reduce maintenance costs in the later stage.
Why do power plants prefer aluminum silicate blankets for high-temperature conditions?
Compared with traditional materials such as calcium silicate board and rock wool, aluminum silicate blanket has significant advantages in temperature resistance and thermal insulation performance. For power plant equipment and pipelines with medium temperatures exceeding 400 ℃, and for the ultra-high temperature of steam turbines, the design specifications explicitly recommend the use of aluminum silicate fiber blankets as internal insulation layers.
1. Excellent high temperature resistance: Aluminum silicate blanket can withstand high temperatures of 1050 ℃ to 1260 ℃ for a long time, far exceeding materials such as rock wool (about 600 ℃), and can perfectly match the harsh working conditions of power plant boilers, steam turbines, and main steam pipelines (temperatures often reach 540-600 ℃).
2. Excellent insulation and energy-saving effect: Its thermal conductivity is extremely low (0.035-0.045 W/m · K), which can effectively block heat transfer. Multi layer composite structure is often used in power plants. For example, the scheme of “multi layer aluminum silicate blanket+nano aerogel blanket” is used for main pipelines above DN500, which can greatly reduce heat loss.
3. Stable structural performance: Aluminum silicate blanket does not contain binders and adopts double-sided needle punching technology to evenly interweave fibers, possessing excellent tensile strength and thermal shock resistance. It can effectively resist the stress caused by thermal expansion and contraction, avoiding material cracking and pulverization.
4. Convenient construction and maintenance: The material is soft in texture and can be cut freely, making it easy to wrap irregular parts such as valves and elbows. During construction, it is usually necessary to reserve about 20% compression to ensure a tight fit of the insulation layer.
What are the insulation materials required for power plants?
Aluminum silicate needle blanket+high temperature binder+high temperature resistant wire mesh+aerogel thermal insulation coating+calcium silicate plaster
How to choose aluminum silicate blanket for power plants?
1. Select the grade based on the actual working temperature
≤ 1000 ℃ flue and hot air duct: choose standard aluminum silicate blanket;
1000-1100 ℃ furnace top and header: high-purity type;
1100-1200 ℃ furnace outlet: high aluminum type;
Frequent thermal shock and ultra-high temperature local: zirconium containing type.
2. Bulk density: Power plants commonly use 128-160kg/m ³. Low bulk density is prone to settlement, while high bulk density increases load.
3. See indicators: low slag ball content, high tensile strength, reducing powdering and slag falling; Control the high-temperature shrinkage rate to avoid heat leakage from gaps after high temperatures.
4. Suppliers with experience in supplying power projects, such as Rosewool Insulation Refractory Co.,Ltd., should be given priority. They can provide selection guidance to ensure product stability and adapt to new and major power plant projects.
Overall, aluminum silicate blanket has become the preferred choice for insulation of high-temperature equipment in modern power plants due to its high temperature resistance, low thermal conductivity, and stable performance. Correctly selecting and cooperating with standardized construction is crucial for ensuring the safe operation of power plants and achieving energy-saving and emission reduction goals.
Rosewool Insulation Refractory Co.,Ltd., as a leading manufacturer of insulation and refractory materials for over 40 years, can provide you with specialized aluminum silicate blankets for power plants, covering a full range of temperature resistance levels from 1050-1430 ℃, and supporting customized thickness and density. Welcome to contact us anytime for selection suggestions and samples!
