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Symbol
Name
V-30
Dilute solution
distribution flow
rate control
(manual butterfly
valve)
V -29
Intermediate
solution flow rate
control valve
(manual butterfly
valve)
(3) Adjustment of each butterfly valve
(Flow rate of dilute solution)
GL : Dilute solution circulating flow rate (total flow rate)
GL1 : Dilute solution flow rate to the high pressure generator
GL2 : Dilute solution flow rate to the low pressure generator
(GL and GL1 flow rates are measured by ultrasonic flowmeter at the factory. In case of no ultrasonic
flowmeter adjust as per the following procedure.)
1) Adjust the flow rate of GL by the valve V-31
2) Adjust the flow rate of GL 1 by the valve V-30
(GL2 changes because GL = GL1 + GL2)
Be sure that the total flow rate GL changes slightly due to pressure differential when the valve
V-30 is adjusted.
(Return flow rate from the high pressure generator --- intermediate concentrated solution)
3) Adjust the return flow rate by the valve V-29
Make a fine adjustment of the flow rate so that the level of the solution in the high pressure
generator may not drop excessively enough to trip and the solution pumps may not repeat start
and stop frequently.
(Spraying flow rate to the absorber --- concentrated solution)
4) Adjust the spraying flow rate by the valve V-34. Adjustment of the valves V-31 and V-30 may often
be required together with the valve V-34. Be sure to adjust the flow rate so that concentrated
solution may not over-flow from the low pressure generator and the solution level of the
concentrated solution pump suction may not drop excessively.
Note : When the solution over-flows, there may be a possibility of crystallization. Grasp the situation
correctly and make an appropriate judgement.
Location and Function
Function
Flow rate control of dilute
solution to the low
pressure generator
Location
Intermediate
concentration solution line
From the high temp. heat
exchanger outlet to the
low pressure generator
inlet
Function
Flow rate control of
intermediate
concentration solution on
return side of the high
pressure generator
Initial Setting
for valve
Opening
Fully closed
32
Remarks
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