ASME Standard Carbon Steel Boiler Parts Manifold Header For Power
In order to improve the boiler efficiency, boilers are gradually
developed into tubular boilers to increase heat transfer area. The
pot water flows from the pot barrel to the lower box through the
downward tube, and is distributed to each tube bundle by the box
body. The water in these tube bundles continuously absorbs heat
energy and collects into the upper box body and then flows back
into the pot barrel. We call the upper and lower box body headers.
Header is an important part of the boiler, which is divided into
upper header and lower header.
The main function is to collet working fluids or redistribute
working fluids to other pipelines through headers. That is, to
collect, mix and distribute working fluids, so as to ensure the
working fluids are evenly distributed and heated. Lower header,
also called coke-proof box, is located on both sides of the grate
and directly contacts with the burning coal seam. Its function is
to cool the coking slag without bonding with the side wall.
According to its location, there are upper header and lower header
or inlet header and outlet header. According to the types of
bundles collected, they can be divided into water wall headers,
super-heater headers, economizer headers and so on.
Header is a pipe fittings for mixing working substances of boilers
and ensuring uniform heating of working substances. Usually the
furnace wall of industrial boilers is composed of rows of
tubes(water-cooled walls), but the size of boilers is huge, and the
structure is complex. It can not guarantee that the working
substances in all tubes absorb the same heat. There are many
differences in heat absorption in different parts. Installing
headers can let the working substance in each tube converge here,
and distribute to the next level of each pipe so as to reduce the
thermal deviation so that the heat absorption, flow of the working
fluid and cooling and thermal efficiency of the boiler are
optimized and improved; in addition, the size, number and layout of
the pipes in the upper, middle and lower parts of the boiler are
different. The header is responsible for connecting each section to
ensure smooth flow of working substances.