What is the function of a steam collection box?

Collects the steam from the superheater and then sends it to the system piping network

The boilers I have worked with do not have superheaters; by \"steam collection box,\" I mean the device that is located between the water wall tubes and the upper drum. Why is it necessary to collect steam before it enters the drum? What are the consequences if it is not collected?

The functions of a boiler header are generally connection and buffering. Components such as water wall tubes, economizers, and the header at the inlet and outlet of superheaters serve primarily as connectors, that is, to link multiple groups of tubes; therefore, they are usually made from seamless steel pipes with a diameter of DN250. The main function of the steam collection header is to provide buffering, that is, to mitigate the impact of loads on the boiler unit. As for its capacity, I believe it should be determined from a control theory perspective, and it may be related to the control system.

The following is copied from \"Boiler Safety Technology (2nd Edition)\\": A header, also known as a manway, is not a separate component; rather, it is part of components such as the water wall, economizer, and superheater. There are thus a water wall header, an economizer header, and a superheater header, among others. The function of the header is to collect or distribute the steam and water working medium, reducing the number of pipes needed for transporting this medium as well as the number of openings in the boiler drum, thereby contributing to improved safety performance of the boiler drum. The lower header located beneath the water wall on both sides of the furnace chamber, near the grate, serves to prevent coking on the sides of the grate; hence it is called a coking prevention box. A header is essentially a thick-walled tube to which many heat-exchanging tubes are connected; it is made from seamless steel tubes, with flat end caps (end plates) welded to its ends. The box is equipped with many pipe holes for welding or expanding pipes. Both ends of the economizer tubes and superheater tubes are connected to the header, while the lower end of the water wall is connected to the header. The upper end can either be connected to the header from which a few tubes lead to the upper drum, or it can be directly connected to the upper drum.