Firing Rates; Minimum Furnace Dimensions - Riello Burners RL 190/M Installation, Use And Maintenance Instructions

RL 190/M
(A)
Diameter (inches)
(B)
A B
FIRING RATES (A)
During operation, burner output varies between:
• MINIMUM OUTPUT: area A;
• MAXIMUM OUTPUT: area B.
The firing rate may be found by plotting a vertical line
from the desired delivery and a horizontal line from the
pressure in the combustion chamber. The intersection of
these two lines is the firing rate which must lie within
area A, for MIN output, and within area B, for MAX out-
put.
Note:
The FIRING RATE areas given in figure (A) have been
reduced by 10% with respect to the maximum range that
can be reached.
Important:
The FIRING RATE area values have been obtained con-
sidering an ambient temperature of 68 °F (20°C), and an
D2422
atmospheric pressure of 394" WC with the combustion
head adjusted as shown on page 7.
Consult Procedure on page 15 to refer burner operating
condition in high altitude plants.
MINIMUM FURNACE DIMENSIONS (B)
The firing rates were set in relation to certified test boil-
ers.
Figure (B) indicates the diameter and length of the test
combustion chamber.
Example:
Output 6400 MBtu/hr:
diameter = 31.5 inch; length 10.4 ft
Whenever the burner is operated in a much smaller
commercially-available combustion chamber, a prelimi-
nary test should be performed to verify operation.
D2920
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