Whether to use hanging bricks or castables for the lining of waste incineration waste heat furnace involves many aspects of consideration, including material performance, use conditions, economic benefits, etc. The following is a detailed comparison of the two materials:
1. Comparison of material performance
Hanging bricks
Advantages: The material of hanging bricks usually has high density and mechanical properties, strong oxidation resistance, and is not easy to crack or peel off. In addition, the thermal conductivity of hanging bricks is also good, which is conducive to the efficient absorption of flue gas heat.
Disadvantages: The installation of hanging bricks is relatively complicated, requiring welding hooks and other accessories, and has high requirements for construction quality. At the same time, the cost of hanging bricks is usually higher than that of castables.
Casting materials
Advantages: Castables have good construction performance and can adapt to the construction of linings of various complex shapes. At the same time, the cost of castables is relatively low, and the formula can be adjusted as needed to meet different use conditions.
Disadvantages: The density and mechanical properties of castables are usually lower than those of hanging bricks, and they are easily corroded by corrosive substances in flue gas. At high temperatures, castables may fail in the form of degradation and cracking, affecting the long-term stable operation of the furnace.
2. Comparison of use conditions
Garbage calorific value: The calorific value of the garbage entering the waste heat furnace of the waste incineration has an important influence on the selection of refractory materials. When the calorific value of the garbage is low, the flue gas temperature is also relatively low, and the castable can meet the use requirements at this time. However, as the calorific value of the garbage increases, the flue gas temperature also increases, and the high temperature resistance and oxidation resistance of the hanging bricks will be more advantageous.
Flue gas composition: The flue gas generated during the incineration process of garbage has a complex composition and contains a variety of corrosive substances. Hanging bricks can better resist the erosion of these corrosive substances due to their high density and antioxidant capacity. Castables may fail due to erosion.
Furnace structure: Different furnace structures will also affect the selection of refractory materials. For example, in some specific furnace structures, hanging bricks may be easier to install and maintain; while in other structures, castables may be more flexible.
3. Comparison of economic benefits
Initial investment: The initial investment of hanging bricks is usually higher than that of castables, because hanging bricks require welding hooks and other accessories, and require higher construction accuracy and quality requirements.
Operation and maintenance: In terms of operation and maintenance, hanging bricks have relatively low maintenance costs due to their high durability and anti-oxidation ability. Castables may require more frequent maintenance and replacement.
Long-term benefits: From the perspective of long-term benefits, although the initial investment of hanging bricks is high, the overall economic benefits may be higher due to their durability and low maintenance costs. Although castables have a lower initial investment, the long-term maintenance and replacement costs may be higher.
Whether to use hanging bricks or castables for the lining of waste heat incineration furnaces needs to be comprehensively considered based on specific use conditions and economic benefits. In the case of high calorific value of garbage, complex flue gas composition or high requirements for refractory materials in the furnace structure, hanging bricks will have more advantages. In the case of low calorific value of garbage, relatively low flue gas temperature or low requirements for refractory materials, castables may be a more economical choice. At the same time, factors such as construction difficulty, material cost and long-term operation and maintenance need to be considered to make the final decision.
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