HYDROO 20HQX-1, Руководство по эксплуатации, Страница: 6 / 9

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5) In order to ensure the gas suction efficiency, use a gas sucking mouth at the
pump sucking point. The gas sucking mouth will guide the gas to the position near
impeller, then guide the gas and liquid to the pump flow part by impeller’s turning
force. The usage of the gas mouth can ensure the gas to suck constantly and
dissolved efficiently. It is suggested to fit a one-way check valve at gas mouth to
prevent from liquid flowing back. The one-way check valve and electromagnetic
valve can avoid solution flowing back n¬ormally. If the gas-liquid mixing device is
operated manually, the one-way check valve and electromagnetic valve may not be
used, but should refer to the operating notice when operating.
6) In order to generate good little gas bubble, the drainage pipe after the pressure
release valve should be noted as follows:
A. The diameter of the drainage pipe should be as big as or bigger than the pump
outlet diameter.
B. The first part of drainage pipe should be horizontal or face upwards. It must not
face down.
C. The little gas bubble release hole should be not smaller than 10mm;
D. The length of the drainage pipe before the outlet valve should be 0.5m —1m, the
pipe after the outlet valve should be as short as possible.
E. The gas flow meter is used to adjust and control the gas suction vo-lume. The
material of gas suction mouth and gas flow meter depends on the sucked gas
and liquid. For ozone application, the material of them should be stainless steel.
7) Suction pipe
A. Normally, the diameter of the suction pipe should be same as the p¬ump suction
diameter or bigger than the pump suction diameter.
B. In the case of suck the gas by negative pressure, the diameter of the suction
pipe should be thinner, but should not be too thin.
C. When the liquid level of the water supply tank is lower thanthe pu¬mp central
height , suggest to fit a footer valve at the lowest position of the suction pipe.
D. Fit a strainer(60 eyes) at the suction pipe to keep of the grain in the liquid.
VIII. USaGE aND OpERatION
1.- Operation
1) Before the first operation, fill water to the pump fully, then open the inlet valve and
outlet valve completely.After close the gas inlet valve and outlet pressure meter,
switch on the power shortly to check the pump rota-ting direction. If the pump
rotating direction is correct, operate the pump. In the following operations, before
switch on the pump power, close the gas inlet valve when manual operation.
2) Close inlet valve gradually, when the vacuometer indicates negative pressure
-10.3kgf/cm2 , open gas suction valve. Open the check valve of the
outlet pressure meter, adjusting outlet pipe controlling valve until arrive to the set
outlet pressure.
3) Adjust inlet pipe controlling valve, gas suction valve, outlet pipe co-ntrolling valve
little by little until liquid flow, gas flow and outlet pressure arrives to preset value.
The gas inlet amount is nearly 7-8% of the liquid inlet amount, should not exceed
to 10%.
E.g.
When the inlet liquid flow is 301/m, the inlet gas flow is 2.4-3.0 1/m;
When the inlet liquid flow is 501/m, the inlet gas flow is 4.0-5.01/m;
4) When inlet water flow, inlet gas flow, outlet pressure arrives to preset value, it can
work normally.
5) When pump stops, close gas suctionvalve firstly, then stop pump.
2.- Important notice
1) With the increment of gas suction, outlet flow and pressure will dec-rease gradually,
when the gas suction amount exceeds the limitation, the f¬low will stop, that is,
pump works but no efficiency.
2) When choose the pump, please refer to the performance curve. The outlet pressure
should be set according to the application. For ozone mixing water, the presetting
value is 2-3kgf/cm2. For gas suspension treating eq-uipment, oxygen adding
treatment, it should be 3.5-4 kgf/cm2. When the inlet gas is 7-8%, big flow pump
should be chosen.
3) The outlet pressure would not exceed 4 kgf/cm2 to generate a little gas pockets.
If pressure exceeds 4 kgf/cm2 , the diameter of the gas pocket and gas solution
amount will not change much, only deduce solution flow or increase pump power
cost.
4) Gas inlet amount
The resolved gas is 3% in the water normally (the saturated resolved amount in the
normal pressure). The inlet gas being pumped should be big than the saturated
resolved amount, it is suggested that the amount should be the 7-8% of the water
flow. The max should not exceed 10%. In addit¬ion, the gas injected to the pump,
the unresolved gas would flow in the pip es as bubble, at the pressure released
valve, it can form gas bag which will affect the generation of the little gas bubble.
Therefore, it is suggested to install a gas liquid separating tank in front of pressure
release valve to vent the redundant gas. The volume of the gas liquid tank should
be chosen ac¬cording to the pump flow. For convenience, the suitable relation of
the gas liquid tank and the pump diameter is as follows.
The discharge diameter of the pump The volume of the gas liquid separating tank
~32 mm 4 kilolitre
40 mm 8 kilolitre
50 mm 29kilolitre