Miura MP1-200, Руководство по эксплуатации

Страница: 44 / 63

SECTION 3 OPERATION
36
c) Operation at boiler start
1) In accordance with the increase in load and resulting decrease in header steam pressure, this
MI controller
(*)
increases the quantity of boilers to fire. The unit starts the boilers while securing
the quantity of low fire boiler that was set in advance at the setting of the quantity of stand-by
boilers (set with the Pressure Controller MP1-200).
P.17
2) The boilers are started in the order of priority
(*)
(from the first priority
(*)
).
d) Operation at boiler stop
1) The unit decreases the quantity of boilers to fire in accordance with the increase in header
steam pressure resulting from decrease in load. The shift from high fire to low fire is performed
on a priority basis regardless of the setting of the quantity of stand-by boilers. Therefore, the
quantity of boilers fired up at low fire may exceed the set quantity of stand-by boilers.
2) If more boilers than the set quantity of stand-by boilers continue low fire for over 15 minutes,
operation is stopped from the lowest priority
(*)
boiler in sequence, and the boilers with high
priority
(*)
are shifted to high fire.
Low fire High fire 1
2
3
4
1
2
3
4
Header pressure
High fire High fire High fire High fire High fire High fire
Low fire
Low fire
Low fire
High fire High fire High fire High fire High fire
High fire High fire High fire
High fire
High fire
Low fire Low fire
Low fire
Low fire
Low fire
Low fire Low fire
Low fire
Low fire
Low fire
Low fire
Low fire
Low fire Low fire
Low fire
Low fire
High fire High fire High fire High fire
High fire
High fire High fire High fire
High fire
Header pressure
1
2
3
4 High fire
Low fire Low fire
Low fire
Low fire
Low fire
Low fire Low fire
Low fire
Low fire
Low fire
Low fire
Low fire
Low fire Low fire
Low fire
Low fire
High fire High fire High fire High fire
High fire
High fire High fire High fire
High fire