JP2018094503A - Method for generating cleaning liquid, cleaning method and facility for generating cleaning liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for generating cleaning liquid sufficiently mixed with fine bubbles without using a high-capacity pump.SOLUTION: A method for generating cleaning liquid that generates cleaning liquid mixed with fine bubbles includes: a step of mixing compressed-air to stock solution that is an undiluted solution of the cleaning liquid; a step of raising pressure of the stock solution mixed with the compressed-air, using a booster pump 12; and a step of causing post-pressure raised stock solution to transition to the cleaning liquid mixed with fine bubbles, using a pressure regulating valve 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cleaning liquid generation method, a cleaning method, and a cleaning liquid generation facility, and more particularly, to a cleaning liquid generation method in which fine bubbles are mixed, a cleaning method using the cleaning liquid, and a cleaning liquid generation facility.

  As methods for washing beverage production equipment and food production equipment, there are decomposition cleaning (Cleaning Out Place: COP) and stationary cleaning (Cleaning In Place: CIP, hereinafter referred to as “CIP”). Disassembly cleaning is a method of cleaning each part or each part after disassembling the equipment. On the other hand, stationary cleaning is a method of cleaning without disassembling the equipment, and is performed by incorporating a cleaning mechanism into the equipment. In particular, in beverage production equipment, etc., a high-pressure cleaning liquid is passed through the pipe from the outside. The cleaning is done. The use of a cleaning liquid in which fine bubbles (microbubbles) are mixed in CIP, the generation method of the cleaning liquid in which fine bubbles are mixed, and the cleaning method using the cleaning liquid are already known. The technique described in Document 1 can be cited. Patent Document 1 discloses that a fine bubble is generated in a liquid fluid by a fine bubble generator, and that cleaning is performed using a liquid fluid in which the fine bubble is mixed.

JP 2008-237995 A

  By the way, in CIP, the cleaning efficiency by the cleaning liquid in which fine bubbles are mixed depends on the flow rate when the cleaning liquid is fed. That is, when the cleaning liquid is fed at the same flow rate, the more fine bubbles are included, the more the amount of liquid necessary for cleaning can be reduced while maintaining the cleaning efficiency. In order to increase the amount of bubbles in the cleaning liquid, it is necessary to introduce the gas at a high pressure. For this reason, when mixing the gas into the stock solution of the cleaning solution, it is necessary to increase the pressure of the stock solution of the cleaning solution using a relatively high performance pump.

  However, since the standard capacity of the standard compressed air supply pump introduced in a general factory is about 0.7 kPa, the pressure for introducing compressed air in the actual gas introduction section is 0.4 to 0.5 kPa. However, in reality, a sufficient amount of bubbles could not be obtained. Although it is conceivable to use a high-capacity pump, there is a problem that the introduction cost increases. Moreover, even if the hydraulic pressure is increased to a predetermined pressure, the hydraulic pressure may decrease somewhat due to pressure loss or the like until gas is mixed. In such a case, the amount of bubbles in the cleaning liquid cannot be obtained sufficiently as a result of insufficient gas uptake.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a cleaning liquid generation method and generation equipment in which fine bubbles are sufficiently mixed without using a high-capacity pump. is there. Another object of the present invention is to improve the efficiency of cleaning with a cleaning liquid.

  According to the cleaning liquid generating method of the present invention, the object is a cleaning liquid generating method for generating a cleaning liquid mixed with fine bubbles, wherein (A) a step of mixing a gas into the stock solution of the cleaning liquid, and (B) the gas It is solved by having a step of increasing the pressure of the stock solution mixed with water and (C) a step of transitioning the stock solution after pressure rising to the cleaning solution mixed with the fine bubbles.

  In the cleaning liquid production method of the present invention, gas is mixed into the stock solution of the cleaning solution and then the pressure of the stock solution is increased. With such a method, a gas mixed liquid having a higher pressure (cleaning liquid stock solution mixed with gas) can be obtained as compared with a case where gas is mixed after the stock solution of the cleaning solution is pressurized. As a result, it is possible to generate a cleaning liquid in which more fine bubbles are mixed.

Further, in the above configuration, the method further includes a step of pumping the stock solution by a pump.
In the step of mixing the gas into the stock solution, the gas at a pressure higher than the pressure of the stock solution at the mixing location in the mixing location located downstream of the pressure pump in the flow path when the stock solution is pumped. Is preferably mixed in the stock solution.
If it is said structure, it will become possible to mix appropriately when mixing gas in the undiluted | stock solution of a washing | cleaning liquid.

Further, in the above configuration, in the step of transitioning the stock solution after pressurization to the cleaning solution in which the fine bubbles are mixed, the pressure after the pressurization is performed by a pressure adjustment mechanism provided in a flow path through which the stock solution after pressurization flows. It is still preferred to adjust the pressure of the stock solution.
If it is said structure, it will become possible to make the gas mixture liquid (gas | cleaning liquid undiluted | mixed liquid which gas mixed) pressurized appropriately transfer to the washing | cleaning liquid mixed with the fine bubble.

The above-described problem is a cleaning method for cleaning using a cleaning liquid mixed with fine bubbles according to the cleaning method of the present invention, wherein (A) a step of mixing a gas into the stock solution of the cleaning liquid, and (B ) Pressurizing the stock solution mixed with the gas; (C) transitioning the stock solution after pressurization to the cleaning solution mixed with the fine bubbles; and (D) cleaning the cleaning solution mixed with the fine bubbles. And a step of feeding the liquid toward the object.
The cleaning liquid generated by the above-described method includes more fine bubbles. By using such a cleaning liquid, it becomes possible to perform cleaning more efficiently.

Further, the above-described problem is a cleaning liquid generation facility that generates a cleaning liquid in which fine bubbles are mixed according to the cleaning liquid generation facility of the present invention, and (A) a gas mixing unit that mixes gas into the stock solution of the cleaning liquid; (B) It is solved by having a pressurizing unit that pressurizes the stock solution mixed with the gas, and (C) a transition unit that transitions the stock solution after pressurization to the cleaning solution mixed with the fine bubbles.
If it is the washing | cleaning-liquid production | generation equipment of this invention, it will become possible to produce | generate the washing | cleaning liquid in which more fine bubbles were mixed.

  According to the present invention, it is possible to generate a cleaning liquid in which more fine bubbles are mixed without using a high-capacity pump. Moreover, it becomes possible to wash | clean more efficiently by using said washing | cleaning liquid.

It is a figure which shows the structure of the washing | cleaning liquid production | generation equipment which concerns on one Embodiment of this invention.

<< Configuration according to an embodiment of the present invention >>
Hereinafter, an embodiment (this embodiment) of the present invention will be described with reference to FIG. In addition, embodiment described below is for making an understanding of this invention easy, and does not limit this invention. That is, the present invention can be changed and improved without departing from the gist thereof, and the present invention includes its equivalents.

  The cleaning liquid generating facility according to the present embodiment, the cleaning liquid generating method using the cleaning liquid generating method, and the cleaning method using the generated cleaning liquid are, for example, pipes and production pipes in production sites of food, soft drinks, chemical products, and the like. Used for in-place cleaning (CIP) of connected equipment.

  In the present embodiment, water in which fine bubbles are mixed (hereinafter referred to as cleaning water) is generated as the cleaning liquid. That is, in this embodiment, water (raw water) is used as a stock solution for the cleaning liquid. In addition, it is not limited to this, You may utilize liquids other than water, or the liquid which added some substance to water as a stock solution of a washing | cleaning liquid.

  The configuration of the cleaning liquid generation facility (hereinafter referred to as the present facility S) will be described. As illustrated in FIG. 1, the present facility S is directed from the tank 1 storing raw water toward the cleaning object X (equipment or piping to be cleaned). The washing water is generated in the installed flow path. The inside of the cleaning object X is cleaned by the flow of cleaning water that has reached the cleaning object X in the flow path.

  A flow path continuously laid from the tank 1 to a flow path area to be cleaned (hereinafter referred to as “cleaning object X”) is a flow path extending in the horizontal direction from the tank 1 to the water supply pump 4 ( Hereinafter, the first flow path 2), the flow path extending in the vertical direction from the feed water pump 4 to the booster pump 12 (hereinafter referred to as the second flow path 5), and the vertical path from the booster pump 12 to the object X to be cleaned. And a channel (hereinafter, third channel 13) extending in the direction and the vertical direction. Each flow path is constituted by a pipe, and the liquid in the flow path, that is, raw water or cleaning water, contacts the atmosphere until it flows through the cleaning object X and is discharged out of the cleaning object X. do not do.

  Each flow path is provided with on-off valves 3, 6, and 17, respectively. The on-off valve 3 installed in the first flow path 2 is maintained in an open state during the operation of the apparatus S.

  The feed water pump 4 is a pressure feed pump, and sucks the raw water in the tank 1 through the first flow path 2 and discharges it at a predetermined discharge pressure. The raw water discharged from the water supply pump 4 is pumped through the second flow path 5. In addition, the feed water pump 4 consists of a vortex pump, for example, and is comprised so that the flow volume (discharge amount) can be controlled. The flow rate and discharge pressure of the raw water discharged by the feed water pump 4 can be adjusted by the opening degree of the on-off valve 6 provided on the downstream side (secondary side) of the discharge port of the feed water pump 4. Note that the flow rate and discharge pressure of the raw water can be confirmed through the flow meter 7 and the pressure gauge 8 installed on the secondary side of the on-off valve 6 in the second flow path 5.

  Further, in the second flow path 5, a position located between the on-off valve 6 and the booster pump 12 (in this embodiment, a position downstream of the flow meter 7 and the pressure gauge 8, the symbol An air supply path 10 through which compressed air as a gas flows is connected to the joint portion (T). The joint portion T corresponds to a mixed portion where the compressed air flowing through the air supply path 10 is mixed into the raw water. That is, the compressed air flows through the air supply path 10 and is mixed into the raw water at the mixing point T. In addition, about the gas enclosed, it is not limited to compressed air, Gas other than air (for example, nitrogen gas etc.) may be sufficient. In this embodiment, since compressed air is not introduced to the upstream side (primary side) of the feed water pump 4, the feed water pump 4 does not cause malfunction due to cavitation. Further, since the raw water on the upstream side (primary side) of the booster pump 12 is pressurized by the feed water pump 4, a pressing pressure of a certain level or more acts on the booster pump 12, and it does not become below atmospheric pressure. Even if compressed air is introduced at a high pressure in the joint portion T, the booster pump 12 does not cause a malfunction due to cavitation.

  Incidentally, the compressed air is supplied from the compressed air source 9. This compressed air source 9 functions as the “gas mixing part” of the present invention together with the second flow path 5 and is constituted by, for example, a compressor, a receiver tank, or a gas cylinder. The air supply passage 10 is provided with an on-off valve 11 and is maintained at a predetermined opening degree while the facility S is in operation.

  Moreover, in the said mixing location T, the pressure of compressed air is over the pressure of raw | natural water. In other words, the compressed air source 9 supplies the compressed air so that the pressure of the compressed air at the mixing point T exceeds the pressure of the raw water at the same point. As a result, at the mixing point T, the compressed air is mixed into the raw water at a pressure higher than the pressure of the raw water at the same point. In addition, about each pressure of the raw | natural water and compressed air in the mixing location T, it can adjust with the opening degree of the on-off valves 6 and 11. FIG.

  The pressure booster pump 12 functions as a “pressure booster” of the present invention, and sucks raw water mixed with compressed air (hereinafter referred to as “air mixed water”) to increase the pressure to a predetermined pressure. By boosting the pressure by the booster pump 12, the pressure of the liquid phase in the aerated water can be adjusted to a pressure necessary to sufficiently dissolve the gas phase (compressed air). The booster pump 12 is composed of, for example, a vortex pump, and is configured such that its discharge pressure can be controlled. The discharge pressure of the booster pump 12 can be confirmed through a pressure gauge 14 installed on the secondary side of the booster pump 12. In this embodiment, compressed air is introduced into the raw water on the upstream side of the booster pump 12 and then pressurized by the booster pump 12, so there is no need to particularly increase the capacity of the compressed air supply pump. A standard pump having a standard capacity of about 0.7 kPa can be used as it is.

  Further, a pressure regulating valve 15 is installed in the third flow path 13. The pressure adjustment valve 15 is an example of a pressure adjustment mechanism and functions as a “transition part” of the present invention. More specifically, the pressure regulating valve 15 is located somewhat downstream of the booster pump 12 in the third flow path 13. Then, when the aerated water boosted by the booster pump 12 passes through the pressure regulating valve 15, the liquid phase pressure in the aerated water decreases. Thereby, the air (compressed air) dissolved in the liquid phase is released out of the liquid phase. At this time, the compressed air is released as fine bubbles. As described above, by adjusting the pressure of the pressure regulating valve 15, the pressurized air-entrained water transitions to washing water in which fine bubbles are mixed.

  The pressure adjustment amount by the pressure adjustment valve 15 is set so as to be a pressure necessary for pumping the cleaning water to the cleaning object X at an appropriate flow rate and securing a sufficient amount of bubbles thereafter. . The adjusted pressure can be confirmed through a pressure gauge 16 installed on the secondary side of the pressure regulating valve 15 in the third flow path 13.

  In the present embodiment, the pressure regulating valve 15 is used as the transition unit. However, the present invention is not limited to this. For example, a disperser (specifically, a static disperser) may be used. Good.

  Next, a cleaning water generation method realized by the facility S and a cleaning method using the generated cleaning water will be described. First, the raw water in the tank 1 is sent to the feed water pump 4 through the first flow path 2, and the feed water pump 4 discharges the raw water at a predetermined discharge pressure. As a result, the raw water is pumped through the second flow path 5 at a predetermined flow rate.

  Then, during the period when the raw water is being pumped in the second flow path 5, the compressed air from the compressed air source 9 is mixed into the raw water at the mixing point T in the second flow path 5. At this time, the compressed air is mixed into the raw water at a pressure higher than the pressure of the raw water at the mixing point T. Thereby, in the range located downstream from the mixing location T in the second flow path 5, the raw water mixed with compressed air (that is, air-mixed water) is pumped.

  Thereafter, the aerated water is sucked into the booster pump 12 and is pressurized to a predetermined pressure. Incidentally, in the present embodiment, the pressure is increased so that the gauge pressure indicated by the pressure gauge 14 is 0.8 to 1.0 MPa, but the compressed air is sufficiently dissolved in the liquid for the pressure after the pressure increase. The pressure is not particularly limited as long as the pressure is necessary.

  The pressurized aerated water is discharged from the booster pump 12 and flows through the third flow path 13, and passes through the pressure regulating valve 15 at a midpoint of the third flow path 13. By adjusting the pressure of the aerated water by the pressure adjusting valve 15, the dissolved air in the aerated water is released as fine bubbles. That is, the pressurized air-containing water transitions to cleaning water in which fine bubbles are mixed.

  Thereafter, the cleaning water mixed with the fine bubbles continues to flow through the third flow path 13 and is pumped to the cleaning object X. Then, as the cleaning water flows through the cleaning object X, the cleaning object X (strictly, the inner wall of the cleaning object X) comes to be cleaned. In the present embodiment, the amount of fine bubbles mixed in the cleaning water is larger than the conventional amount (for example, the value of “gas phase / (liquid phase + gas phase)” is set to about 20%. The cleaning object X can be efficiently cleaned with a smaller amount of water.

1 tank 2 first flow path 3 on-off valve 4 water supply pump (pressure feed pump)
5 Second flow path 6 On-off valve 7 Flow meter 8 Pressure gauge 9 Compressed air source (gas mixing part)
10 Air Supply Path 11 Open / Close Valve 12 Booster Pump (Pressure Booster)
13 Third flow path 14 Pressure gauge 15 Pressure adjustment valve (pressure adjustment mechanism, transition section)
16 Pressure gauge 17 On-off valve S This equipment (cleaning liquid production equipment)
X Object to be cleaned

Claims (5)

A cleaning liquid generation method for generating a cleaning liquid mixed with fine bubbles,
Mixing gas into the stock solution of the cleaning liquid;
Pressurizing the stock solution mixed with the gas;
And a step of transitioning the stock solution after pressurization to the cleaning solution mixed with the fine bubbles. Further comprising the step of pumping the stock solution with a pump.
In the step of mixing the gas into the stock solution, the gas at a pressure higher than the pressure of the stock solution at the mixing location in the mixing location located downstream of the pressure pump in the flow path when the stock solution is pumped. The cleaning liquid production method according to claim 1, wherein the raw liquid is mixed in the stock solution.   In the step of transitioning the stock solution after pressurization to the cleaning solution mixed with the fine bubbles, the pressure of the stock solution after pressurization is adjusted by a pressure adjustment mechanism provided in a flow path through which the stock solution after pressurization flows. The method for producing a cleaning liquid according to claim 1 or 2. A cleaning method for cleaning using a cleaning liquid mixed with fine bubbles,
Mixing gas into the stock solution of the cleaning liquid;
Pressurizing the stock solution mixed with the gas;
Transitioning the stock solution after pressurization to the cleaning liquid mixed with the fine bubbles;
A step of feeding the cleaning liquid mixed with the fine bubbles toward an object to be cleaned. A cleaning liquid generating facility for generating a cleaning liquid mixed with fine bubbles,
A gas mixing part for mixing gas into the stock solution of the cleaning liquid;
A pressurizing unit that pressurizes the stock solution mixed with the gas;
And a transition section for transitioning the stock solution after the pressure increase to the cleaning liquid mixed with the fine bubbles.