Four factors affecting CFB boiler life
1. Design & installation craft
In recent years, no matter in separation method or in anti-wearing technique, there is great progress in CFB boiler development. From the perspective of anti-wearing refractory materials, degrading the quality of refractory materials is not good for the normal operation of CFB boiler. Even when the quality of anti-wearing refractory materials is very good, if installation craft can’t meet standards and lead to dimensional deviation, there will be severe abrasion, or if refractory material are not corrected constructed, it will also greatly affects the safe and economic operation of CFB boiler.
2. CFB boiler masonry craft
Construction quality is crucial to the service life of CFB boiler. CFB boiler construction workers should not only be familiar to furnace construction standards and electric power specifications, but should know refractory materials performance well. As to the aspect of CFB boiler design, construction workers should know design draft well, for example, fastening device, sealing device and expansion joints preservation should be thoroughly considered. When irrational design is discovered, it should be point out and put forward reasonable measures to avoid operational problem.
3. CFB boiler roasting craft
CFB boiler main body structure is complicate, working lining construction area is large, water content is high, so proper roasting craft should be carried out after the finish of construction. If roasting is not done according to designed craft or roasting time is shortened, material interior vapor pressure will be overlarge, when it exceed the tensile strength of refractory material, there will have structural rupture. After the operation of boiler, refractory lining will have structural sapling or thermal stress damage in refractory material interior, the operation safety and the service life of CFB boiler will be greatly affected. So, furnace roasting is very important link before the operation of CFB boiler.
4. CFB boiler operation craft
The successful blow in rate is 100%. Although the boilers are produced by the same factory, are applied in the same region, and adopt the same kind of coal, there also have different problems during the operation of CFB boilers. The reason is that operational craft control is different. If workers don’t operate CFB boiler according to specifications, there will have cracks, spalling or even collapse during CFB boiler operation. That is to say, normative operation is the last factor affecting the service life of CFB boiler.