Strebel BRU 1 Series, Руководство по установке, Страница: 8 / 30

ASSEMBLY INSTRUCTIONS FOR:
Page 8
11/07/00
Positioning the baffles
Push the Baffles into the flue–ways as far as the stop Fit
standard equipment in accordance with table below.
Flue gas temperature can be raised by removing the baffles.
Standard boilers are equipped with the following baffles.
Boiler
sections 4 5 6 7 8 9
2nd
Pass 6xA 6xA 6xA 6xA 6xA 6xB
3rd Pass 6xB 6xB 4xB 4xB
With less than 6 baffles the lower passes remain free.
The flue gas temperature of a boiler depends on boiler water
temperature and boiler capacity. If boiler water temperature is
reduced the flue gas temperature is also reduced. If boiler
capacity is reduced by means of a different burner setting or by
the first stage of a two-stage burner, the flue gas temperature is
also reduced. The flue gas temperature rises by some 20ºC –
40ºC in the case of dirty flue-way surfaces, depending on the
degree of fouling.
Influence of baffles
If the baffles in the 3rd flue pass are removed, the flue gas
temperature rises by approx. 20ºC; if the baffles in the 2nd flue
pass are also removed, the flue gas temperature rises by a total
of approx. 40ºC.
NOTE:
RU 2s baffle details in Fig 8.2.
The RU 3s range of boilers do NOT use flue gas baffles.
Alternatively they have ribbed intermediate sections
denoted by the section legs painted in green.
Influence of water temperature
A change of 10ºC in the water temperature produces a change in
flue gas temperature of approx. 5ºC– 8ºC.
Boiler water and return temperatures
The boiler is operated with low flue-gas temperatures in order to
achieve maximum efficiency. If the boiler water or return
temperatures are too low, there is a danger that heating surfaces
will become fouled and encrusted this results in higher flue gas
temperatures, making boiler cleaning difficult, and in extreme
cases cause damage.
The following conditions must be maintained:
Oil fired:
boiler water temperature min: 60ºC
Return water temperature min: 50ºC
Gas fired
boiler water temperature min: 70ºC
Return water temperature min: 60ºC
RU 1s max. kW oil kg/h Nat. gas
m /h
4 190 17.5 22
5 250 23 29
6 320 29.5 37
7 390 36 46
8 460 42 54
9 525 47.8 61
Type and
no. of sections
Output and fuel consumption
Refer to Fig. 7.2 for technical data on the RU 2s and
Fig. 6.3 for the RU 3s
Positioning the Baffles
ASSEMBLY INSTRUCTIONS FOR:
RU 1s Assembly