JP3241749B2 - Evacuation method for vacuum deaerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to vacuum degassing, which requires multi-processing capability such as rust prevention by degassing condominiums and buildings and deoxygenation treatment of boilers, etc. and reduced life, operation cost and maintenance. The present invention relates to a method for evacuation of a device.

[0002]

2. Description of the Related Art Conventionally, a deaerator using vacuum has been decompressed in a deaeration tank by a general vacuum pump of an air suction and exhaust type to perform gas-liquid separation, and the generated gas is continuously discharged by a vacuum pump. There are a deaerator that exhausts gas and maintains the degree of decompression, and a membrane deaerator that uses a special membrane and depressurizes the outer surface when passing liquid through the inner surface and separates only gas from the liquid to the outside of the membrane.

[0003]

A deaerator using a vacuum device of an air suction and exhaust type requires two pumps, a pump for liquid supply and a vacuum pump for depressurizing the inside of the tank. It will be big. If the vacuum pump is not replaced or maintained periodically, the performance of the pump is reduced. As a result, there is a problem in that the balance of water supply under vacuum is lost, and the degree of pressure reduction is not increased. Deaerators using membranes also require the use of liquid water pumps and vacuum pumps, and the membranes themselves are expensive, and require pretreatment and periodic maintenance to prevent deterioration in membrane life and performance. Initial costs and operating costs are significantly higher,
In long-term operation, there are problems in life, operation cost, maintenance, and the like.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and a method for depressurizing and exhausting a vacuum deaerator according to the present invention comprises a deaeration tank, an exhaust tank, and an exhaust tank. An exhaust valve having a check mechanism provided at the top, a water supply passage connected to the deaeration tank, one flow path connecting the top of the deaeration tank and the bottom of the exhaust tank, and a water supply pump at the bottom of the deaeration tank A drainage channel that connects to the water supply side of the pump and guides liquid from the drainage side of the water supply pump;
In the depressurizing / evacuating method of the vacuum deaerator having the other flow path branched from the water supply pump discharge side of the drainage passage and connected to the lower part of the exhaust tank, the other flow path is closed and one of the flow paths is opened. A step of supplying liquid to the degassing layer while discharging liquid by the water pump and filling the degassing tank and the exhaust tank with liquid, and stopping supply of new liquid into the degassing tank, A step of performing gas-liquid separation in a degassing tank by discharging a liquid by a water pump through a drainage channel, and closing one of the flow paths when the gas in the degassing tank reaches a predetermined pressure reduction degree. While discharging the liquid in the deaeration tank by the water supply pump through the drainage channel with the other flow path opened, a part of the discharged liquid is supplied into the exhaust tank through the other flow path. Extruding the gas in the exhaust tank to the outside through an exhaust valve. A.

In another configuration of the method for depressurizing and exhausting a vacuum deaerator according to the present invention, a deaeration tank, an exhaust tank, and an exhaust valve having a check mechanism provided on the deaeration tank and the exhaust tank are provided. ,
A water supply channel connected to the deaeration tank, an upper flow path connecting the upper part of the deaeration tank and the upper part of the exhaust tank, and a bottom part of the deaeration tank connected to the water supply side of the water supply pump and liquid from the water discharge side of the water supply pump A first bottom passage connecting the water supply pump water supply side of the drain passage to the bottom of the exhaust tank, and a second bottom passage branching from the water pump discharge side of the drain passage and communicating with the bottom of the exhaust tank. In the vacuum evacuation method of the vacuum deaerator having the above, the deaeration tank side flow path and the second bottom flow path on the water supply pump water supply side of the drainage path are closed, the upper flow path is opened, and the first bottom flow path is connected to the drainage path. Filling the deaeration layer with the liquid while discharging the liquid by the water supply pump in a state of being connected to the water supply pump through the water supply pump side flow path on the water supply pump water supply side, and filling the deaeration tank and the exhaust tank with the liquid. And the supply of new liquid into the degassing tank is stopped. Upper flow path, an exhaust tank, first bottom flow path, and by ejecting the water pump via the drain passage, and performing gas-liquid separation in the degassing tank,
When the gas in the deaeration tank reaches a predetermined degree of pressure reduction, the upper flow path and the first bottom flow path are closed, and the deaeration tank side flow path and the second bottom flow path on the water supply pump water supply side of the drainage channel are connected. While the liquid in the degassing tank is discharged by the water supply pump through the drainage channel in the open state, a part of the discharged liquid is supplied to the exhaust tank through the second bottom passage, and the gas in the exhaust tank is supplied. Extruding outside through an exhaust valve.

[0006] With such a configuration of the present invention, it is possible to supply the processing liquid of the vacuum deaerator and maintain the reduced pressure in the deaeration tank and perform multiple treatments with one pump, and the maintenance, maintenance costs, and operation costs are reduced. It is greatly reduced and can be adapted for long-term use.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 denotes a deaeration tank which is made of hard vinyl chloride, stainless steel or the like and is connected to an exhaust tank 2 having an exhaust valve 8 via an automatic valve 3 (in FIG. The water supply pump 5 is connected by a connection pipe 3C via an automatic valve 3 via an automatic valve 3, and an automatic valve 3A is provided between the connection portion and the deaeration tank 1, and an automatic valve 3B connecting the deaeration tank 1 and the exhaust tank 2 is provided. A discharge pipe 6 is connected from the lower part of the air tank 1 via a water supply pump 5, and a discharge pipe after the water supply pump 5 is connected from the connection pipe 7 to the exhaust tank 2 via the automatic valve 4. A degassing apparatus for executing the present invention is constructed from the gas that has been passed through the degassing tank 1 through the airbag.

The automatic valves 9 and 3 (in FIG. 2, the automatic valves 9, 3 and 3B) are opened, and the automatic valves 4 (in FIG. 2 the automatic valves 4 and 3A) are closed. After the liquid is supplied from the water supply pipe 10 and the inside of the deaeration tank 1 and the exhaust tank 2 are filled with the liquid, the automatic valve 9 is closed and the water supply pump 5 closes the exhaust tank 2.
In FIG. 1, the liquid in the deaeration tank 1 is directly discharged and the liquid is discharged by the suction force.
Discharge from inside. At the same time, the gas remaining in the degassing tank 1 or generated gas has a low specific gravity, so the automatic valve 3
Through the exhaust tank 2 (in FIG. 2, the exhaust tank 2
A liquid is discharged from the inside, the inside of the exhaust tank 2 is depressurized, and the gas in the deaeration tank 1 is forcibly sucked, thereby depressurizing the inside of the deaeration tank 1. When the degree of pressure reduction in the deaeration tank 1 reaches the set pressure reduction degree, the automatic valve 3 (the automatic valves 3 and 3B in FIG. 2) closes, and the automatic valve 4 (the automatic valves 4 and 3A in FIG. 2) opens. The treated water discharged by the water supply pump 5 is supplied to the exhaust tank 2 through the connecting pipe 7 branched from the discharge pipe 6 to increase the water level, and the gas introduced into the exhaust tank 2 is exhausted by the exhaust valve 8. The exhaust valve 8 is an automatic air bleed valve provided with a check mechanism to exhaust only gas without allowing liquid to pass therethrough. In this state, the liquid subjected to the gas-liquid separation processing is discharged in the deaeration tank 1. During the processing, the set pressure reduction degree in the deaeration tank 1 is broken. At this point, each automatic valve is controlled to supply liquid directly from the exhaust tank 2 or through the degassing tank 1. Indirectly caused to discharge,
The gas generated in the degassing tank 1 is raised or sucked into the exhaust tank 2 to recover the degree of pressure reduction in the degassing tank 1. The above-described operation is performed by automatically controlling the automatic valve by the controller and repeating the depressurization and exhaustion by detecting with a vacuum sensor, a water level sensor and the like provided in the deaeration tank 1 so that the degree of decompression in the deaeration tank 1 can be reduced during continuous processing. That is, when the inside of the degassing tank 1 is between the set decompression degrees, the deaerated water treated in the deaeration tank 1 is discharged and supplied, and the inside of the degassing tank 1 becomes equal to or less than the set decompression degree. At this point, the processing liquid supplied to the exhaust tank 2 is discharged and supplied with the liquid required to reduce the pressure, thereby continuously supplying the processing water having a constant concentration and the degree of pressure reduction in the degassing tank 1. And a method for depressurizing and exhausting the vacuum deaerator.

[0009]

As described above, according to the present invention, during normal operation, gas-liquid separation is performed in a deaeration tank, the treated water is discharged, and at the same time, the treated water is supplied to an exhaust tank to exhaust the introduced gases. At the time when the degree of decompression has decreased, discharging the treated water supplied to the exhaust tank and maintaining the reduced pressure to continuously supply the treated water,
The pump is limited to a water supply pump. Therefore, the set degree of reduced pressure can be maintained without using a conventional vacuum pump, and a processing solution having a constant concentration can always be supplied. In the experiment, a 30-liter vacuum tank and a 20-liter liquid tank were placed in a 17-liter exhaust tank and a 50-liter deaeration tank of hard vinyl chloride resin, and a single-phase 10 pump was supplied to the water pump.
0V, 50Hz suction total head -4m, output 0.4KW, using solenoid valves corresponding to non-pressure for each automatic valve, water supply / discharge pipe diameter of deaerator 30A, water supply / discharge to apartment water tank By connecting the pipes and circulating the liquid at a flow rate of 3 t / h, it is possible to maintain the degassing tank depressurization degree between -740 and -720 mmHg, and the liquid temperature is 4-6 ° C in terms of the deoxygenation capacity. The dissolved oxygen amount was about 12 ppm after the treatment, and the degassing ability of about 70% was actually measured. Also, as mentioned above, the main motive power is that only one liquid water pump can discharge and depressurize the liquid, so initial costs, maintenance, maintenance costs, operation costs are greatly reduced, and life is improved. Is also excellent, and has a tremendous effect in multiprocessing and long-term use.

[Brief description of the drawings]

FIG. 1 is an embodiment of the present invention.

FIG. 2 is an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deaeration tank 2 Exhaust tank 3, 3A, 3B, 4, 9 Automatic valve 5 Water supply pump 6 Discharge pipe 7, 3C Connecting pipe 8 Exhaust valve 10 Water supply pipe

Claims (2)

(57) [Claims] 1. A deaeration tank, an exhaust tank, an exhaust valve having a check mechanism provided on an upper part of the exhaust tank, a water supply passage connected to the deaeration tank, a top of the deaeration tank and a bottom of the exhaust tank. And a drain that connects the bottom of the deaeration tank to the water supply side of the water pump and guides the liquid from the drain side of the water pump. In the vacuum evacuation method of the vacuum deaerator having the other flow path and the other flow path, the other flow path is closed, and while the one flow path is opened, the liquid is discharged to the deaeration layer by the water supply pump. Supplying water and filling the degassing tank and exhaust tank with liquid, stopping the supply of new liquid into the degassing tank, and discharging the liquid in the degassing tank by a water pump through a drainage channel. Performing the gas-liquid separation in the degassing tank, and when the gas in the degassing tank reaches a predetermined pressure reduction degree. When one of the flow paths is closed and the other flow path is opened, a part of the discharged liquid is discharged to the other flow path while discharging the liquid in the deaeration tank by a water supply pump through a drainage path. Supplying the gas into the exhaust tank via a path and pushing the gas in the exhaust tank to the outside through an exhaust valve. 2. A deaeration tank, an exhaust tank, an exhaust valve having a check mechanism provided on each of the deaeration tank and the exhaust tank, a water supply passage connected to the deaeration tank, and an upper part of the deaeration tank. An upper passage connecting the upper part of the exhaust tank, a drain connecting the bottom of the deaeration tank to the water supply side of the water pump and guiding the liquid from the discharge side of the water pump, a water pump water supply side of the drain and the exhaust tank. A first bottom passage connecting the bottom of the drainage passage, and a second bottom passage branching from the water pump drain side of the drainage passage and communicating with the bottom of the exhaust tank. The deaeration tank side flow path and the second bottom flow path on the pump water supply side are closed, the upper flow path is opened, and the first bottom flow path is connected to the water supply pump via the water supply pump side flow path on the water supply pump water supply side of the drainage passage. While supplying the liquid to the degassing layer while discharging Supplying the deaeration tank and the exhaust tank with a liquid, stopping the supply of new liquid into the deaeration tank, and allowing the liquid in the deaeration tank to flow through the upper flow path, the exhaust tank, and the first bottom flow path And a step of performing gas-liquid separation in the deaeration tank by discharging the water by a water supply pump through a drainage path, and when the gas in the deaeration tank has a predetermined degree of pressure reduction, the upper flow path and the first With the bottom flow path closed and the deaeration tank side flow path on the water supply pump water supply side of the drainage path and the second bottom flow path opened, the liquid in the deaeration tank is discharged by the water supply pump through the drainage path. ,
Depressurizing the vacuum degassing device, comprising: supplying a part of the discharged liquid to the exhaust tank via the second bottom passage, and pushing out the gas in the exhaust tank to the outside through the exhaust valve. Exhaust method.