Galmet Galaxia KWE-12 Service And Installation Manual - page 7
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Service and installation manual - C.H. Water Boiler
7
2.1.1. Boiler water body
The exchanger in boilers is made from certified boiler steel plate grade P 265 GH thickness 6 mm. The boiler shell is made from 4 mm steel plate.
The boiler is constructed as a 4-draugth exchanger:
- vertical combustion chamber
- horizontal combustion tube exchanger
- vertical water tube exchanger
In the combustion chamber (1) there are flue gas reheating elements, a deflector (30) and ceramic shells (2) with swirlers (3) placed between them. Over
the chamber there is a vertical water tube (5) and horizontally mounted combustion tubes (7), inside of which there are swirlers (8) placed. The vertical
exchanger comprises a vertical water tube (9) located in a duct ended on top with a cleaning hole (20) and in the back ended with a hole, in which the flue
(23) is mounted with a dust collector (24) fitted inside of it. In the boiler bottom (4) there is a drawer (22) comprising two parts: in the front one the ash from
the chamber is accumulated while in the back part the dust from the back water tube duct is collected. Tightness of the duct is provided by the cleaning hole
cover (21) with a seal mounted between the two parts of the drawer.
2.1.2. Doors
The boiler is provided with 3 steel doors with knobs (15), featuring adjustable pressure on seals (17). The doors have an insulation board (14) protecting
the doors against overheating. The cleaning door (11) is used for cleaning water tube ducts and upper surface of the combustion tube. The chamber door
(12) is used to position the system of swirlers and cleaning the combustion chamber surface. The burned door (13) is used for lighting up the burner,
removing of ash and dust produced in the combustion process accumulated in the ash pan drawer. They have an insulation board protecting the doors
against overheating and an additional insulating plate (18) placed under the door guard (16).
2.1.3. Insulation panels
The insulation panels (29) are fixed on the surface of the water body. The are made from powder coated steel plate with high corrosion resistance. From
inside they are lined with mineral wool (28). Their job is to limit boiler heat loss to the environment apart from the aesthetic purpose.
2.2. Feeder
The feeder comprises a feeding unit, which is outside of the boiler and a burner set located inside of the boiler, which is fixed to the boiler flange (27).
2.2.1. Feeding unit
The feeding unit is constructed of a feeder tube (39) ended with two flanges and a stokehole (40) with a rectangular flange, to which a fuel bin (44) is
mounted through a seal. The fuel bin is constructed from bent and welded steel plates and a bin cover (45) closed with two locking devices. Tightness of
the connection is assured by a rubber seal located on the damper circumference. The stokehole of the feeder features holes closed with covers (41), used
for emergency emptying of the fuel bin. There is a screw (36) mounted in the feeder tube (39) driven by a gear motor comprising an electric motor (43),
coupling and two-stage reduction (42). An overload safety breaker (38) is mounted in the beginning of the screw shaft, whose task is to protect the motor
in case of blocking of the screw.
2.2.2. Burner unit
The retort burner is constructed of a burner ring (31), burner box pane (32) and bend (33). The above elements are made from cast iron and placed in a
steel air chamber (34), which is fixed with a rectangular flange by bolts through a seal to the boiler body. From the bottom the air chamber is covered with
the burner cleaning hole (35) with the seal and fixed with M8 thumb nut. The burner unit comprises also a cast iron deflector (30) suspended over the
combustion box whose task is reheating of carbon oxide and spreading the flame so as the hot flue gas blew against the combustion chamber walls. The
fuel is fed by the screw (36) from the bin (44), feeder tube (39), bend (33) to the burner ring (31) where it is burned. Air to the burner ring nozzles in the
combustion box is supplied by a low noise fan (46). Tightness between the steel body of the air chamber (34) and the bottom of the combustion box bottom
(32) is obtained by placing a water and high temperature 1200oC resistant sealing. M10 that are located on the air chamber circumference (34) are used to
center the combustion box pan towards the bend (the chamber and loosing tightness in respect to the combustion box pan).
2. Technical specification