When designing a boiler structure, the goal is to use a minimum amount of metal and the amount of combustion. Take up as little space as possible to make the boiler meet the specified operating parameters and meet the requirements of safety and reliability. Specifically, the boiler structure meets the following requirements.
1 Each part should be able to expand freely according to the intended direction of the design during operation. Each part of the boiler is made of steel and is linearly expanded after being heated. If the heated surface cannot expand in the predetermined direction of the design, the deformation of the component will be hindered and then deformed or even destroyed.
2 can ensure that the water circulation of each part of the circulation circuit is normal, and all the heating surfaces should be reliably cooled. If the water circulation is not good, it will cause the wall of some heated surfaces to overheat, the strength will be weakened and eventually cause damage. In general, the water circulation of the shell boiler is safe and reliable, and the problem of the water tube boiler is more
3 Each pressure component should have sufficient strength. This requirement is mainly to ensure safety. Since the strength is insufficient, the pressure member may be broken or even exploded, but the steel is also considered to be saved. Therefore, the minimum wall thickness of the pressure member is specified in the calculation standard of the strength.
4 Compression, the form of the component structure, the arrangement of the openings and welds should avoid or reduce the composite stress and stress concentration. If the pipe is heated on the straight section, the distance between the welds shall not be less than 150mm