What does 'thermal shock' refer to in boiler operation?

Thermal shock in boiler operation refers to the stress that occurs in components when there are rapid temperature changes. This sudden change can lead to differential expansion or contraction of materials, which creates internal stresses. For example, if a hot component is suddenly exposed to a cold environment, it can contract too quickly, leading to cracks or failures. Understanding thermal shock is crucial for maintaining the integrity of boiler components, as managing temperature changes effectively is key to ensuring safe and efficient operation. It highlights the importance of maintaining consistent thermal conditions to avoid damaging the boiler systems.