JPS641161B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a degassing device for degassing air and the like dissolved in a liquid. When producing soft drinks, a deaerator is used to remove air and the like dissolved in the liquid.

Fig. 1 and Fig. 2 respectively show the configuration of a conventional deaerator, and the one shown in Fig. 1 belongs to a packed tower, and in Fig. 1, a is a deaeration tank;
There is a water distributor b inside, a water distribution tank c with many small holes on the bottom, and a basket d attached to the bottom of the water distribution tank c. Inside the basket d, there is a hollow cylindrical object to enlarge the contact surface with the liquid. A large number of Raschig rings e are packed in order to increase the degassing efficiency, and these Raschig ring packed beds are arranged in multiple stages to increase the degassing efficiency. A vacuum device f controls the inside of the degassing tank a to a predetermined degree of vacuum, and the degree of vacuum is indicated by a vacuum gauge g. The liquid to be degassed is supplied from the supply port h to the water distribution device b via the automatic flow rate adjustment valve i and the piping, and is uniformly distributed by the water distribution tank c to the packed bed of Raschig rings e filled in the basket d. .
The contact area of the liquid to be degassed with the vacuum atmosphere is expanded by this packed layer, and while flowing down the complicated flow path, dissolved gas is separated, and the liquid is separated from the bottom plate of the basket d, which is composed of a perforated plate. , which have been sufficiently degassed, collect at the bottom of tank a. The flow rate of the degassed liquid supplied from the supply port h is controlled by the liquid level control device j and the automatic flow rate adjustment valve i, and the degassed liquid is fed from the bottom of the tank a to the liquid sending pump k. The liquid is sent to the next process through the discharge port 1.

The one shown in Fig. 2 belongs to a wet wall tower, and in Fig. 2, A is a deaeration tank, inside of which a water distribution tank A and a deaeration plate C are provided. E is a vacuum evacuation device that controls the inside of the degassing tank to a predetermined degree of vacuum, and the degree of vacuum is indicated by the vacuum gauge O. The liquid to be degassed flows into the water distribution tank A from the supply port C through the automatic flow rate adjustment valve, and is evenly distributed to the degassing plate C, forming a falling liquid film on the surface of the degassing plate C. It is degassed by being exposed to a vacuum atmosphere with appropriate turbulence and flows down to the bottom of the tank chamber. The liquid to be degassed supplied from the supply port h is controlled by the liquid level control device 7 and the automatic flow rate adjustment valve.
The flow rate of the liquid distributed to the degassing plate C is controlled.
Further, the degassed liquid is sent from the bottom of the tanker to the next process via a liquid sending pump via a discharge port.

However, all of the above-mentioned degassing devices have the following drawbacks because they have complicated structures such as a packed bed of lachish rings or a degassing plate in the degassing tank.

(1) The structure inside the deaeration tank requires considerable cost.

(2) Because there are structures inside the deaeration tank, it is not easy to clean the inside of the tank.

(3) The volume of the deaeration tank is large due to the structure housed within the deaeration tank, and the volume utilization efficiency within the deaeration tank is poor.

(4) In order to store the structure inside the deaeration tank, the deaeration tank requires a large opening, which causes high costs and requires consideration to maintain the airtightness of the deaeration tank.

The present invention was proposed in view of the above points, and
The purpose is to eliminate the drawbacks of conventional packed tower type or wet wall tower type deaerators, and to provide a deaerator that is inexpensive, has a simple structure, is small, and has sufficient deaerator performance.

A preferred embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

In Fig. 3, 1 is a degassed liquid supply port, 2 is an automatic flow rate adjustment valve, 3 is an automatic three-way switching valve, 4 is a tank lid, 5 is a jet nozzle, 6 is a deaeration tank, 7 is a vacuum gauge, and 8 1 is a tank viewing window, 9 is a liquid level control device, 10 is a cleaning liquid pipe, 10a is a tank cleaning spray, 11
12 is a vacuum suction device, 12 is a vacuum piping, 13 is a check valve, 14 is a liquid sending pump, 15 is a deaerated liquid outlet, 16 is a bypass piping, 17 is an automatic bypass valve, 18 is a check valve, 19 is a drain valve, and the automatic flow rate adjustment valve 2 works in conjunction with the liquid level control device 9 to automatically control the supply amount of the liquid to be degassed so as to keep the liquid level of the liquid to be degassed in the deaeration tank 6 constant. It is controlled by
In other words, the liquid to be degassed is automatically supplied according to the consumption amount of the degassed liquid to be sent to the next process by the liquid sending pump 14.

The three-way automatic switching valve 3 switches the flow path of the supplied liquid, and during normal degassing operations, it switches the supplied degassed liquid to the side of the jet nozzle 5 fixed to the tank lid 4, and degass the liquid. When cleaning the inside of the degassing tank 6, the flow path of the cleaning liquid supplied from the supply port 1 is switched to the tank cleaning spray 10a attached to the degassing tank 6 via the piping 10.

A jet nozzle 5 fixed to the tank lid 4 spouts the liquid to be degassed into a liquid column onto the storage surface of the liquid to be degassed, which is controlled to maintain a constant liquid level at the bottom of the deaeration tank 6. It sprays violently.

The degassing tank 6 includes a vacuum gauge 7, a tank viewing window 8,
A liquid level control device 9 and the like are installed to control the degree of vacuum and liquid level within the tank.

The vacuum device 11 maintains the inside of the degassing tank 6 at a predetermined degree of vacuum, and sucks the gas degassed from the liquid to be degassed and its vapor through the check valve 13 and the vacuum piping 12. It is something that is discharged.

The liquid sending pump 14 sucks the degassed liquid from the deaeration tank 6 and sends it to the next process from the degassed liquid outlet 15 via the check valve 18.

The bypass pipe 16 circulates a portion of the deaerated liquid that is pressure-fed by the liquid pump 14 to the primary side of the jet nozzle 5 via an automatic bypass valve 17 . Note that the automatic bypass valve 17 is opened and closed in conjunction with the operation of the liquid feed pump 14.
When the automatic bypass valve 17 starts operating, the automatic bypass valve 17 is automatically opened, and the full opening degree of the automatic bypass valve 17 can be adjusted.

In the above configuration, the degassed liquid inlet 2 of the jet nozzle 5 fixed to the tank lid 4 as shown in FIG.
When the liquid to be degassed is made to flow into the vacuum atmosphere 22 in the degassing tank 6 through the jet port 21 and is ejected in the form of a liquid column 23 due to the differential pressure between the liquid supply pressure and the vacuum atmosphere, the liquid to be degassed is The liquid column 23 is violently injected into the liquid to be degassed stored at the bottom of the deaeration tank 6. At this time, bubbles 24 are generated in the upper layer of the liquid to be degassed stored at the bottom of the deaeration tank 6 by the fluid kinetic energy of the liquid to be degassed, which has become a liquid column 23, and at the same time, the liquid is being stored. The upper layer of the liquid to be degassed forms a liquid column 23 and is violently disturbed together with the liquid to be degassed. The composition of the bubbles 24 is composed of the degassed gas separated by the liquid to be degassed and the vapor of the liquid to be degassed, and is approximately the same as the composition of the gas in the vacuum atmosphere 22 in the degassing tank 6. . The bubbles 24 that are further generated rise while stirring the stored liquid to be degassed while coalescing, and the dissolved gas in the liquid to be degassed is separated and released into the vacuum atmosphere 22. . Due to this action, the upper layer of the liquid to be degassed stored at the bottom of the deaeration tank 6 becomes the deaeration treatment layer 25, where many air bubbles are mixed and the liquid is heavily disturbed.
is formed, and effective degassing is performed in this degassing layer 25.

The jet nozzle 5 has a large number of jet ports 21, and the fluid kinetic energy applied by the liquid column 23 of the liquid to be degassed to the interface between the vacuum atmosphere 22 and the degassing layer 25. It is made to be flat evenly. Therefore, the thickness of the degassing layer 25 is
A substantially uniform liquid can be obtained, and the liquid to be degassed can be uniformly disturbed in a plane and bubbles can be generated. This means that the thickness of the degassed layer 25 formed by the action of the liquid column 23 is almost constant, making it difficult to cause circulation flow to the layer of degassed liquid 26 below it. effective. Since the circulating flow is small, the bubbles 24 are difficult to flow downward and are easily separated, and the problem of back mixing due to this circulating flow does not normally occur, and special baffles and bubbles for preventing back mixing are used. The depth of the degassed liquid layer 26 can be kept to the necessary minimum due to consideration of separation.

Furthermore, the ejection nozzle 5 influences the deaeration efficiency in the deaeration treatment layer 25 depending on the supply flow rate of the deaeration target liquid, that is, the flow rate of the deaeration target liquid ejected from the ejection nozzle 5 . When the flow rate of the liquid to be degassed ejected from the ejection nozzle 5 decreases, the deaeration efficiency decreases, and the degree of deaeration at the degassed liquid outlet 27 decreases. Therefore, a part of the degassed liquid that is sucked into the liquid sending pump 14 and discharged from the degassed liquid outlet 27 is bypassed and circulated to the primary side of the jet nozzle 5, and the liquid is discharged from the jet nozzle 5. Adjust the jetting amount to the required apparent flow rate. By adjusting this bypass flow rate, it is possible to handle a wide range of processing flow rates of the liquid to be degassed without replacing the jet nozzle 5. Furthermore, the degassing efficiency can be adjusted by fixing the processing flow rate of the liquid to be degassed and changing the bypass flow rate.

At the start of operation, the degassed liquid outlet 15 is closed by a means not shown, the vacuum device 11 is activated, and the liquid to be degassed is circulated along the bypass circuit 16 to achieve a predetermined level of deaeration. After reaching the temperature, the degassed liquid outlet 15 is opened and normal operation begins. Further, the inside of the tank can be easily cleaned or sterilized by supplying the cleaning liquid from the supply port 1 at the end of the operation and ejecting it from the spray 10a. The cleaning liquid ejected from the spray 10a to clean or sterilize the inner surface of the tank is sent to the next process from the deaerated liquid outlet 15 via the liquid sending pump 14, and passes through the bypass piping 16 and the automatic bypass valve 17. The liquid is also circulated through the jet nozzle 5 to thoroughly clean or sterilize the inside of the deaerator, and the remaining liquid in the deaerator is discharged through the drain valve 19.

Therefore, according to this embodiment, the following great effects can be achieved.

(1) There is no need to provide a structure in the degassing tank for expanding the gas-liquid contact area of the liquid to be degassed, such as a filler or a degassing plate, as in conventional devices, and the tank can be made smaller.

(2) Since the ejection nozzle does not spray the liquid to be degassed into droplets but forms a liquid column, energy dissipation is small, and therefore pressure loss at the ejection nozzle can be reduced.

(3) Since the jet nozzle is used only to generate a liquid column, the hole diameter of the jet port is relatively large, making it difficult to get clogged, and making it easy to manufacture and have a simple structure. .

(4) A degassing layer is created in the liquid storage area at the bottom of the deaeration tank by using multiple jet nozzles to inject an effective liquid column onto the liquid storage surface of the deaeration tank. Since it forms a deaerated liquid layer and makes it difficult to generate a circulation flow between the two layers, there is no need for a baffle plate or the like to prevent back mixing.

(5) By increasing the number of spout ports of the jet nozzle, as a result, back mixing between the degassed layer and the degassed liquid layer in the liquid storage section is small, and bubble separation is prevented. It is effective and the amount of liquid stored in the degassing tank can be reduced, so the device, especially the tank, can be downsized.

(6) Since the inside of the deaeration tank is very simple, cleaning and sterilization operations specific to food manufacturing machines are easy.

(7) Since the required volume of the degassing tank is small, the time required to vacuum the degassing tank at the start of operation is short.

(8) Since there is no need to install a special structure inside the deaeration tank, the opening of the deaeration tank can be as small as necessary, and it is easy to keep the deaeration tank airtight.

(9) By bypassing and circulating a portion of the degassed liquid, the apparent flow rate can be kept constant and a wide range of flow rates of the degassed liquid can be treated.

(10) Deaeration efficiency can be adjusted by bypassing and circulating a portion of the deaeration treated liquid and adjusting its flow rate.

(11) If necessary, it is also possible to perform feedback control in which the degree of deaeration of the deaerated liquid is automatically detected and the degree of opening of the automatic bypass valve is controlled based on the control signal.

As described above in detail with respect to the embodiments, the present invention includes a deaeration tank that is controlled to a predetermined degree of vacuum, and a liquid to be deaerated that is supplied to maintain a predetermined liquid level in the deaeration tank. a degassed liquid supply and discharge device that discharges the degassed liquid together with the degassed liquid supplied by the degassed liquid supply device, and a degassed liquid stored in the degassed tank; It consists of a jet nozzle that has a large number of spout ports that can spray the liquid as a column inside the degassing tank and evenly spray it on the surface of the liquid to be degassed stored in the same degassing tank. By spraying the degassed liquid evenly onto the liquid surface of the stored liquid to be degassed in a vacuum atmosphere, the kinetic energy of the liquid causes bubbles to be generated in the liquid. At the same time, it increases the contact area of bubbles, disturbs the upper layer of the stored liquid to be degassed, and separates it into a deaeration treatment layer and a deaeration treatment liquid layer, making it difficult to generate a circulating flow between these two layers. In addition, it is possible to degas efficiently and effectively, and the structure is simpler, more compact, and less expensive than conventional devices.

Furthermore, the present invention circulates a part of the liquid after deaeration,
It has a circulation path for re-injection, and can efficiently degas the liquid to be degassed in a wide range of processing amounts.

Furthermore, the present invention has an in-tank cleaning device that supplies cleaning liquid together with the circulation path and squirts it into the tank. Cleaning or sterilization can be carried out extremely easily, and the provision of the circulation path has the advantage that the injection nozzle itself can also be cleaned.

Note that the present invention is suitable as a deaerator for producing soft drinks, and can also be used for general industrial purposes as an efficient deaerator.

[Brief explanation of the drawing]

1 and 2 are overall configuration diagrams showing a conventional type, respectively, FIG. 3 is an overall configuration diagram showing an embodiment of the present invention, and FIG. 4 is an explanatory diagram of a degassing operation state. 1: Liquid supply port, 2: Flow rate adjustment automatic valve, 3: Three-way automatic switching valve, 5: Spray nozzle, 6: Deaeration tank,
9: Liquid level control device, 10: Cleaning liquid piping, 10a:
Cleaning spray, 11: Vacuum device, 14: Liquid pump, 15: Processed liquid outlet, 16: Bypass piping, 17: Automatic bypass valve.

Claims (1)

[Claims] 1. A deaeration tank that is controlled to a predetermined degree of vacuum, and a liquid to be deaerated is supplied to maintain a predetermined liquid level in the deaeration tank, and the liquid after the deaeration process is discharged. a device for supplying and discharging a liquid to be degassed; and a device for injecting the liquid to be degassed supplied by the liquid to be degassed supplying device as a liquid column into the liquid to be degassed stored in the deaeration tank and degassing the same. 1. A deaeration device comprising a jet nozzle having a large number of jet ports capable of spraying a liquid to be degassed stored in an air tank evenly in a plane. 2. A deaeration tank that is controlled to a predetermined degree of vacuum, and a supply of the deaeration liquid that supplies the deaeration tank to maintain a predetermined liquid level in the deaeration tank and discharges the liquid after deaeration processing. and a discharge device, the liquid to be degassed supplied by the liquid to be degassed supplying device is injected as a liquid column into the liquid to be degassed stored in the deaeration tank, and the liquid to be degassed is stored in the deaeration tank. an ejection nozzle having a large number of ejection ports capable of ejecting the liquid uniformly in a plane onto the liquid surface of the liquid to be degassed; A degassing device characterized by comprising a circulation path that circulates to the device and re-injects the air. 3. A deaeration tank that is controlled to a predetermined degree of vacuum, and a supply of the deaeration liquid that supplies the deaeration tank to maintain a predetermined liquid level in the deaeration tank and discharges the liquid after deaeration processing. and a discharge device, the liquid to be degassed supplied by the liquid to be degassed supplying device is injected as a liquid column into the liquid to be degassed stored in the deaeration tank, and the liquid to be degassed is stored in the deaeration tank. A jet nozzle has a large number of spout ports capable of uniformly jetting the liquid to the surface of the liquid to be degassed, and a part of the liquid to be degassed discharged by the liquid to be degassed discharged by the liquid to be degassed is discharged from the liquid to the liquid. It consists of a circulation path that circulates to the column injection device and re-injects it, a cleaning liquid supply pipe connected to the deaeration tank, and an in-tank cleaning device that spouts the cleaning liquid supplied by the pipe into the deaeration tank. A degassing device characterized by: