JPH10311699A - Sterilizing-washing device of running water part of running water system and attached piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure that the adhesion of micro-organism to a heat transfer surface and the proliferation of the micro-organism are suppressed easily, to eliminate problems of environmental protection, and to sterilize and wash a running water part and attached piping on the conditions that are also economically advantageous. SOLUTION: Piping 3A and 3B are connected to an inlet and outlet 2B and 2A of a running water part 2 which is indirectly heat exchanged with a heat medium F passing through a heat medium passage 1 in a heat exchanger. There is provided with a communicating pipe 5 which communicates the piping 3A to 3B between the first running water cutoff valve 4A and 4B that are interposed in these pipings 3A and 3B and the inlet and outlet 2B and 2A, so that a circulation loop 6 is formed of a running water part 2, the piping 3A, 3B, and the communicating pipe 5. In the communicating pipe 5, the second running water cutoff valve 7, a gas-liquid separator 8, a drain valve 9, a circulation pump 11, and a water supply system 14 provided with a tapping valve 12 and a water supply tank 13 are interposed, and the communicating pipe 5 is equipped with an ozone generator 15 which supplies ozone gases, so as to supply the ozone gases to the clean water from the water supply tank 3 circulating in a circulation loop 6 to perform sterilization.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for sterilizing and cleaning a water passage of a water passage system and an attached pipe.

[0002]

2. Description of the Related Art For example, a water passage 2 for indirect heat exchange with a heat medium F passing through a heat medium passage 1 shown in FIG. 4 is provided, and pipes 3A and 3B for flowing water through the water passage 2 are provided with water passages. In the heat exchanger connected to the inlet 2A and the outlet 2B of the section 2, when the sewage or river water containing a relatively large amount of microorganisms is supplied to the water section 2 from the pipe 3A, the sewage or Microorganisms contained in the river water are used to pass water 2 and pipes 3A,
In some cases, the microorganisms adhere to the inner surface of 3B, that is, the heat transfer surface, proliferate, and generate microbial dirt called slime. The generation of microbial dirt lowers the heat transfer performance and lowers the heat exchange efficiency. Further, even in the case where fresh water is supplied from the pipe 3A to the water passage section 2 like a food heat exchanger, Escherichia coli and the like may grow inside the water passage section 2 and the pipes 3A and 3B. Is also possible.

Therefore, conventionally, slime has been removed by disassembly cleaning by mechanical means or stationary cleaning using a chemical called CIP and hot water. But,
The disassembly and cleaning by mechanical means is difficult to perform in a plate heat exchanger having a heat transfer surface having a complicated structure, and effective slime removal cannot be expected. On the other hand, stationary cleaning using a chemical called CIP and hot water is economically disadvantageous because of the problem of chemical treatment and the necessity of an energy source for securing hot water. In addition, since it is necessary to consider the effect on the environment, the method is complicated, and effective slime removal cannot be expected. In addition, neither the mechanical means nor the chemical means can be expected to have the effect of suppressing the attachment of microorganisms to the heat transfer surface and the growth of microorganisms.

[0004]

That is, conventional mechanical means and chemical means are difficult and time-consuming to work with, and effective slime removal cannot be expected, so that adhesion of microorganisms and growth of microorganisms are suppressed. It cannot be expected to be effective. In addition, chemical means is economically disadvantageous because of the problem of chemical treatment and the necessity of an energy source to secure hot water, and it is necessary to consider the impact on the environment. Have. Therefore, the present invention can easily and surely suppress the adhesion of microorganisms and the growth of microorganisms, and can sterilize and wash the water passage section and the attached piping without the problem of environmental conservation, and are economically advantageous. It is an object of the present invention to provide a sterilization and cleaning device for a water-flowing section of a water-flow system and an attached pipe.

[0005]

In order to achieve the above object, the present invention relates to a water flow system in which pipes for flowing water to a water flow section are respectively connected to inlets and outlets of the water flow section. A first water cutoff valve is provided for each, and a communication pipe for connecting the pipes between the first water cutoff valve and an inlet / outlet of the water passage section is provided, and the water passage section and the pipes are provided. A circulation loop is formed by the communication pipe and a second water cutoff valve, a gas-liquid separator, a drain valve, a circulation pump,
A water replenishment system having a water injection valve and a water refill tank is interposed, an ozone generator for supplying ozone gas to the communication pipe is provided, and an expansion absorption tank is disposed in communication with an upper part of the gas-liquid separator. It is characterized by. According to the present invention, it can be normally performed by opening the first water cutoff valve and closing the second water cutoff valve, the drain valve, and the water injection valve. On the other hand, by closing the first water cutoff valve and opening the second water cutoff valve and the drain valve,
After draining the water in the circulation loop, close the drain valve and open the water injection valve to send fresh water from the rehydration system into the circulation loop, fill the circulation loop with fresh water, and inject water. Close the valve. Then, the circulation pump is operated to circulate fresh water in the circulation loop, and the ozone generator is operated to supply ozone gas into the circulation loop. Part of the ozone gas supplied as bubbles in the circulation loop
Dissolve in clear water and sterilize while circulating. In addition, ozone gas which is not dissolved in fresh water is sterilized while circulating in the form of air bubbles, thereby suppressing the attachment of microorganisms to the water passage section and the attached piping of the water passage system and the growth of microorganisms. On the other hand, the operation of the ozone generator continuously supplies ozone gas into the circulation loop. However, since excess ozone gas and air can be separated and discharged from fresh water by the gas-liquid separator, continuous supply of ozone gas becomes possible.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram at the time of heat exchange showing an embodiment of the present invention. The same or corresponding parts as those in the conventional example shown in FIG. In FIG. 1, the heat exchanger is provided with a water passage 2 for indirect heat exchange with the heat medium F passing through the heat medium passage 1, and pipes 3 </ b> A and 3 </ b> B for flowing water through the water passage 2 are provided with water passages. 2 entrance 2
A and outlet 2B. The pipe 3A is provided with a first water cutoff valve 4A, and the pipe 3B is provided with a first water cutoff valve 4A.
B is provided.

A communication pipe 5 is provided between the first water cutoff valves 4A and 4B and the inlets and outlets 2A and 2B of the water flow section 2 to communicate the pipes 3A and 3B. Therefore, a circulation loop 6 is formed by the water passage section 2, the pipes 3A and 3B, and the communication pipe 5. A second water cutoff valve 7, a gas-liquid separator 8, and a circulation pump 11 are provided in series with the communication pipe 5, and a gas passage between the gas-liquid separator 8 and the suction side of the circulation pump 11 is provided. A drainage pipe 10 having a drainage pipe 3A valve 9 inserted in the communication pipe 5 and a water supply system 14 having a water injection valve 12 and a water tank 13 in the communication pipe 5 between the discharge side of the circulation pump 11 and the pipe 3A. Is interposed. Further, an ozone generator 15 for supplying ozone gas to the communication pipe 5 is provided. The end of the ozone gas supply pipe 15A in the ozone generator 15 is open to a throttle 5A formed in the communication pipe 5 between the water supply system 14 and the suction side of the circulation pump 11.

The expansion absorption tank 16 is provided above the gas-liquid separator 8.
Are arranged in communication. The expansion absorption tank 16 and the water refill tank 13 are positioned so that the level LL at or near the bottom of the expansion absorption tank 16 and the full water level HWL of the water refill tank 13 are set at the same position. Water tank 13
The full water level HWL is always maintained at the full water level HWL by the operation of the water level control means (not shown). An automatic exhaust valve 17 is provided in communication with the upper end of the expansion absorption tank 16, and the outlet of the automatic exhaust valve 17 is
It communicates with the outside of the system via a waste ozone decomposer 18. In the figure,
19 and 20 indicate check valves.

With such a configuration, as shown in FIG.
The first water cutoff valves 4A and 4B are opened, and the second water cutoff valve 7 is opened.
And the drain valve 9 and the water injection valve 12 are closed,
As shown by the solid arrow, pipe 3A → water passage 2 → pipe 3B
The heat exchange can be performed by flowing water through the path.

On the other hand, as shown in FIG. 2, the first water cutoff valves 4A and 4B are periodically closed, and the second water cutoff valve 7 and the drain valve 9 are opened to periodically open the circulation loop 6 as shown in FIG. After discharging the water, the drainage valve 9 is closed and the water injection valve 12 is opened as shown in FIG. 3, whereby the fresh water stored in the water refill tank 13 of the water refill system 14 is sent into the circulation loop 6. Then, the circulation loop 6 is filled with fresh water, and the water injection valve 12 is closed.

Next, the circulation pump 11 is operated to circulate fresh water in the circulation loop 6, and the ozone generator 15 is operated to supply ozone gas into the circulation loop 6 from the ozone gas supply pipe 15 A. The supply of the ozone gas to the circulation loop 6 is performed by opening the tip of the ozone gas supply pipe 15A to a throttle portion 5A formed in the communication pipe 5 between the water refilling system 14 and the suction side of the circulation pump 11. This is possible by the ejector action. The circulation pump 11
When ozone gas is supplied to the suction side of, the ozone gas is agitated in the circulation pump 11 and ozone bubbles are reduced, so that the ozone gas is easily dissolved in fresh water.

A part of the ozone gas supplied as bubbles into the circulation loop 6 is sterilized while being dissolved in fresh water and circulated. In addition, ozone gas which does not dissolve in fresh water is sterilized while circulating in the state of air bubbles, and the water passing part 2, the pipe 3A,
Sterilization and cleaning can be performed to suppress the adhesion of microorganisms to the inner surface of 3B and the growth of microorganisms.

On the other hand, the operation of the ozone generator 15 continuously supplies ozone gas into the circulation loop 6. However, excess ozone gas can be separated from fresh water by the gas-liquid separator 8 and discharged out of the system through the path from the automatic exhaust valve 16 to the exhaust ozone decomposer 18, so that continuous ozone gas supply becomes possible.

Furthermore, since the ozone gas is mixed as small bubbles into the fresh water circulating in the circulation loop 6, the apparent volume of the fresh water increases due to the expansion, but the expansion can be absorbed by the expansion absorption tank 16. . For this reason, the water level of the circulation loop 6 is stabilized at a level slightly higher than the level LL at or near the bottom of the expansion absorption tank 6, and in this state, the excess ozone gas is removed from the automatic exhaust valve 16 → the exhaust ozone decomposition. It is discharged out of the system through the path of the vessel 18.

The above-mentioned water passage section 2 and attached pipes 3A, 3B
After the germicidal washing is performed for a predetermined time, the operations of the circulation pump 11 and the ozone generator 15 are stopped, the second water cutoff valve 7 is closed, and the first water cutoff valves 4A and 4B are opened. Thus, the heat exchangeable state shown in FIG. 1 can be obtained.

In the above embodiment, the attached pipes 3A and 3B are connected to the inlet 2A and the outlet 2B of the water passage 2 of the heat exchanger, and the first water cutoff valve 4A is provided in the pipe 3A, and the pipe 3B
Is provided with a first water cutoff valve 4B, as shown in FIG. 4, a water passage 2 composed of a container, a tank or the like is provided, and attached pipes 3A and 3A are provided at an inlet 2A and an outlet 2B of the water passage 2. 3B
And a first water cutoff valve 4A may be provided in the pipe 3A, and a first water cutoff valve 4B may be provided in the pipe 3B.

[0017]

As described above, according to the present invention, the adhesion of microorganisms and the growth of microorganisms can be easily and reliably suppressed, and the sterilization and cleaning of the water passage and the attached pipes can be performed without environmental conservation problems. This is economically advantageous because it eliminates the problem of chemical treatment required by conventional chemical means and the need for an energy source to secure hot water.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram when water in a circulation loop is discharged.

FIG. 3 is a configuration diagram at the time of sterilization in which ozone gas is supplied to fresh water in a circulation loop.

FIG. 4 is a configuration diagram showing another embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat medium passage 2 water passage 2A inlet of water passage 2B outlet of water passage 3A pipe 3B pipe 4A first water cutoff valve 4B first water cutoff valve 5 communication pipe 6 circulation loop 7 second water cutoff Valve 8 Gas-liquid separator 9 Drain valve 11 Circulation pump 12 Water injection valve 13 Refill tank 14 Refill system 15 Ozone generator 16 Expansion absorption tank F Heat medium

Claims (1)

[Claims] A first water cutoff valve is provided for each of said pipes in a water flow system in which pipes for flowing water to said water flow section are respectively connected to inlets and outlets of said water flow section. A communication pipe is provided for communicating the pipes from between the water shutoff valve and the inlet / outlet of the water communication section, and a circulation loop is formed by the water communication section, the respective pipes, and the communication pipe. Water cutoff valve, gas-liquid separator, drain valve, circulation pump,
A water replenishment system having a water injection valve and a water refill tank is interposed, an ozone generator for supplying ozone gas to the communication pipe is provided, and an expansion absorption tank is disposed in communication with an upper part of the gas-liquid separator. A disinfection and cleaning device for a water passage part and an attached pipe of a water passage system, characterized in that: