Steam boilers

Eckrohr Steam Boilers

Eckrohr-Boiler, Corner Tube Boiler, is a boiler for all kinds of fuel. Originally it got its name because it has downcomers in the four corners. It is a natural water circulation single drum boiler and it needs no circulation pump.
Downcomers, headers and waterwalls are welded together to a gas-tight tube cage.
The Eck-rohr-Boiler is self-supporting and needs no supporting structure. It stands on its own downcomers.

Due to the cage structure with downcomers, headers and overhead pipes the Eckrohr-Boiler is earthquake safe (more than 550 boilers installed in Japan, many of them for municipal waste).

The new Eckrohr marine steam boiler design

This ERK boiler is designed to install on a tanker, which is used as utilities providing station for an offshore platform.
Eckrohr-Boilers are available as auxiliary boilers operating on oil or waste heat from the diesel engine. The weight of Eckrohr marine boilers is significantly low. The support structure on the ship is simple.
The Eckrohr-Boiler configuration is particularly suited to marine duty as the water circulation is tolerant of high roll angles and will maintain safe water circulation at high inclination angles. More than 600 Eckrohr marine steam boilers have been built.

ERK =  EckRohrKessel

Eckrohr Boilers water and steam flow diagram

1. unheated return tubes
2. header
3. mixture tubes
4. riser tubes (evaporator)
5. overflow tubes
6. unheated steam drum
7. unheated downcomers

The water-steam mixture flows upwards through the riser tubes (4). In the upper mixture tube (3) steam is already separated from water and a part of the water flows through unheated return tubes (1) to the header (2). The separated steam flows through the overflow tube (5) to the steam space of the drum (6). The remaining mixture runs through mixture tube (3) into the drum. The final separation of water and steam takes place in the drum, the water flows through the downcomers (7) to the headers (2).