JPH05215491A - Heat exchanger for water heat source - Google Patents

Abstract

PURPOSE:To always maintain a heat exchanging efficiency high, to eliminate a loss of cleaning liquid and to reduce a running cost by easily cleaning slime, etc., by a simple operation without necessity of labor of disassembling a heat exchanger body even if the slime, etc., is generated in the body due to an organic matter, etc., contained in sewage, sea water, etc., to be utilized as a heat source water. CONSTITUTION:The heat exchanger for a water heat source comprises a cleaning closed loop system 35 in which cleaning liquid Q can be circulated to be fluidized from a tank 29 for storing the liquid Q into a heat exchanger body 1 in the body 1 to be operated by a loop system 26 of a heat source water W at the time of an ordinary operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heat source heat exchanger such as a multi-tube cylindrical heat exchanger.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional general heat exchanger for water heat source,
For example, it shows the structure of a multi-tube cylindrical heat exchanger.
In the figure, reference numeral 1 is a cylindrical heat exchanger body whose both ends are closed by lids 2 and 3, and the inside of the heat exchanger body 1 is composed of a thin tube and extends along the axis of the heat exchanger body 1. A large number of cooling fluid pipes 4 arranged are supported and fixed by tube plates 5 and 6. Reference numerals 7 and 8 denote chambers formed at both ends of the heat exchanger body 1, and one chamber 8 is divided into two chambers 8A and 8B by a partition plate 9. Reference numeral 10 denotes a heat medium inlet port provided in the heat exchanger body 1 corresponding to the chamber 8A for introducing the heat medium F, and 11 denotes a heat medium body 1 corresponding to the chamber 8B. It is an outlet port for the heat medium for letting out the heat medium F.

A heat source water inlet port 12 for allowing the heat source water W to flow in is provided at one end of the heat exchanger body 1 between the tube sheets 5 and 6, and further, the heat exchanger body 1 has a heat source water inlet port 12. On the other end side, a heat source water outlet port 13 for letting out the heat source water W is provided. The heat exchanger body 1
A plurality of support plates 14 are fixed between the tube plates 5 and 6 inside so as to alternately traverse the cooling fluid pipe 4 from opposite directions, and by these support plates 14, the heat exchanger main body is provided. A zigzag-shaped flow path 15 is formed in the shaft 1 in the axial direction.

In the multi-tube cylindrical heat exchanger having the above structure,
The heat medium F such as CFC gas flowing in from the heat medium inlet port 10 enters the chamber 7 from the chamber 8A through a large number of cooling fluid pipes 4 and then from this chamber 7 to another cooling fluid pipe 4
To the chamber 8B, and flows out from the chamber 8B via the heat medium outlet port 11. On the other hand, the heat source water W that has flowed in from the heat source water inlet port 12 has a zigzag-shaped flow path 1
After passing through the inside 5, the heat source water outlet port 13 flows out. While the heat source water W flows through the zigzag flow path 15, the heat medium F is indirectly exchanged with the heat medium F passing through the cooling fluid pipe 4.

[0005]

By the way, in recent years, sewage, river water or seawater has been used as a heat source water for the above-mentioned multi-tubular cylindrical heat exchanger for economical reasons. It is getting more and more. However, sewage and the like contain a large amount of impurities such as organic substances, and therefore, scales and slimes are likely to be generated in the heat exchanger body 1, and if they adhere to the surface of the cooling fluid pipe 4, they may be separated from each other. Since the membrane heat resistance increases and the heat exchange efficiency significantly deteriorates, it is required to regularly wash the inside of the heat exchanger body 1. However, since a large number of cooling fluid pipes 4 are arranged in the heat exchanger body 1 at an extremely small pitch, a part of the heat exchanger body 1 is simply disassembled.
It is difficult to wash the details even if it is released, and the washing effect cannot be expected sufficiently.

The present invention has been made in view of the above circumstances, and can easily wash away slime and the like in the heat exchanger body, improve heat exchange efficiency, and lose the cleaning liquid. It is an object of the present invention to provide a heat exchanger for a water heat source, which can suppress the temperature and facilitate temperature and pH management and the like, and can economically perform maintenance and management of high heat exchange efficiency.

[0007]

[Means for Solving the Problems] To achieve the above object
The heat exchanger for a water heat source according to claim 1 of the present invention is
Heat source absorbed from the water heat source at the time of turning by the water supply pump
Pour water into the heat exchanger body, and remove the heat source water after heat exchange.
Water heat source attached with a heat source water loop system for returning to the heat source
Tank containing cleaning liquid in a heat exchanger
When cleaning, the cleaning liquid in the tank is transferred to the heat exchanger.
It is sent to the inside of the body through the open / close valve on the feed side that is opened during cleaning.
And the cleaning liquid after cleaning is released during cleaning.
For liquid supply for cleaning that returns to the tank via the open / close valve
A pump, and a tank for supplying the cleaning liquid
Opening / closing valve for the cleaning liquid feed side and opening the cleaning liquid return side
Closed loop system for cleaning liquid by closing valve and heat exchanger body
Is configured.

Further, the heat exchanger for water heat source according to claim 2 of the present invention allows heat source water sucked from the water heat source by the heat source water feeding pump to flow into the heat exchanger body during normal operation, and In a heat exchanger for a water heat source provided with a heat source water loop system for returning the heat source water after exchange to the water heat source, a feed side opening / closing valve which is inserted in a feed pipe in the heat source water loop system and opened during normal operation The inlet side of the tank in which the cleaning liquid is stored is connected to the downstream side through the return side opening / closing valve that is opened during cleaning, and is connected to the return pipe in the loop system and is opened during normal operation. The outlet side of the tank is connected to the upstream side of the side opening / closing valve through a feed side opening / closing valve that is opened during cleaning and a cleaning liquid supply pump, and this pump, tank, and cleaning liquid supply side opening / closing valve,
A closing loop system for the cleaning liquid is constituted by the return side opening / closing valve for the cleaning liquid and the heat exchanger body.

Further, in the heat exchanger for water heat source according to claim 3 of the present invention, the heat source water sucked up by the heat source water feeding pump from the water heat source during normal operation is introduced into the heat exchanger body, and In a heat exchanger for a water heat source provided with a heat source water loop system for returning the heat source water after exchange to the water heat source, heating means for raising the temperature of the cleaning liquid, and the cleaning liquid heated at the time of the cleaning are heated by the heat And a pump for feeding a cleaning liquid to be fed to the exchanger body.

Further, in the heat exchanger for water heat source according to claim 4 of the present invention, the temperature of the cleaning liquid is raised from the tank in which the cleaning liquid is stored and sent to the heat exchanger body, and the cleaning is performed. A closed loop system of the cleaning liquid for returning the subsequent cleaning liquid to the tank is constituted.

[0011]

According to the first aspect of the present invention, during normal operation such as daytime, heat exchange is performed between the heat source water and the heat medium circulated in the heat exchanger body by the heat source water loop system. Here, even if slime or the like is generated in the heat exchanger body due to the use of sewage containing a large amount of impurities such as organic matter as heat source water, the closed loop system of the cleaning liquid is activated when the normal operation is stopped such as at night. As a result, the cleaning liquid in the tank circulates in the closed loop through the heat exchanger body.
Even if the heat exchanger body is not disassembled, it is possible to automatically wash away the slime and the like to maintain high heat exchange efficiency. Moreover, since the cleaning system is a closed loop as described above, it is possible to suppress wasteful consumption of the cleaning liquid and the slime inhibitor added as necessary, and to reduce the running cost while enhancing the sufficient cleaning effect. You can

According to the second aspect of the present invention, a part of the closed loop system of the cleaning liquid is formed by utilizing a part of the closed loop system of the heat source water. It is possible to reduce the equipment cost by sharing the above.

Further, according to the invention of claim 3, even if slime or the like is generated in the heat exchanger main body due to the use of sewage containing a large amount of impurities such as organic substances as the heat source water,
By feeding the cleaning liquid into the heat exchanger body when the normal operation is stopped such as at night, the slime can be washed away, and at this time, the cleaning liquid can be heated and raised in temperature. As well as enhancing the action, it is possible to exert a bactericidal effect on organic substances and microorganisms.

Further, according to the invention of claim 4, by circulating the cleaning liquid in a closed loop system, it is possible to suppress the waste of the heated cleaning liquid and the running cost required for cleaning. Can be reduced.

[0015]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a configuration diagram showing a heat exchanger for a water heat source according to an embodiment of the present invention. In FIG. 1, the same parts as those of the conventional example shown in FIG. The description is omitted.

In FIG. 1, reference numeral 21 is a heat source water feed pump for sucking up the heat source water W from a water heat source D such as sewage or seawater, which is fed into the heat exchanger body 1 by a feed pipe 22.
The heat source water W after heat exchange is configured to be returned to the water heat source D through the return pipe 23. Reference numerals 24 and 25 denote a feed-side on-off valve and a return-side on-off valve for heat source water which are interposed in the feed pipe 22 and the return pipe 23 and are opened during normal operation. The pump 21 and the feed side opening / closing valve 2
4, the return side opening / closing valve 25, the heat exchanger body 1 and the like constitute a loop system 26 for the heat source water W during normal operation.

The heat exchanger body 1 has an inlet port 27 for a cleaning liquid Q containing a cleaning agent or a slime inhibitor.
And an outlet port 28 for the cleaning fluid Q is provided.
29 is a tank in which the cleaning liquid Q is stored, and 30 is a delivery pipe 31 for supplying the cleaning liquid Q in the tank 29 during cleaning.
Is a pump for feeding a cleaning liquid, which feeds the cleaning liquid Q after cleaning into the heat exchanger main body 1 to return it to the tank 29 through the return pipe 32. The pump 30
And the inlet port 27 are closed during normal operation,
In addition, the feed-side on-off valve 33 that is opened during cleaning is provided,
Further, the return pipe 32 is provided with a return side opening / closing valve 34 which is closed during normal operation and opened during cleaning.
The tank 29, the pump 30, the feed side opening / closing valve 33, the return side opening / closing valve 34 and the heat exchanger body 1 constitute a closed loop system 35 of the cleaning liquid Q.

Next, the operation of the water heat source heat exchanger configured as described above will be described. During normal operation, for example, during daytime air conditioning, the loop system 26 of the heat source water W operates. That is, the feed-side opening / closing valve 24 and the return-side opening / closing valve 25 of the loop system 26 are open, and when the heat source water supply pump 21 is driven in this state, the heat source water W sucked up from the water heat source D is drawn. Is fed into the heat exchanger body 1 to exchange heat with the heat medium F such as CFC, and then returned to the water heat source D again.

When the water heat source D is sewage, river water or the like, the heat exchanger body 1 is caused by organic matter contained in them.
Slime and scale are generated inside. Therefore, the closed loop system 35 of the cleaning liquid Q is operated at night or the like. That is, since the operation of the loop system 26 of the heat source water W is stopped at night or the like, after opening the feed side opening / closing valve 33 and the return side opening / closing valve 34 of the closed loop system 35 of the cleaning liquid Q, By driving the pump 30, the cleaning liquid Q in the tank 29 is fed into the heat exchanger body 1. Therefore, since the slime and the like are washed away by the cleaning liquid Q, the inside can be easily cleaned without disassembling the heat exchanger body 1. Moreover, since the cleaning liquid Q is circulated in the closed loop system 35, the cleaning liquid Q is
Waste of slime suppressor etc. contained in is suppressed,
It is possible to exert an effective cleaning effect while suppressing the running cost. As a result, the predetermined heat exchange can always be efficiently performed.

Further, the closed loop system 35 facilitates temperature control and pH control of the cleaning liquid Q, and the cleaning effect can be further improved.

FIG. 2 is a block diagram showing a heat exchanger for a water heat source according to another embodiment of the present invention. In FIG. 2, the outlet side of the tank 29 is connected to the return side opening / closing valve 25 for heat source water with respect to the return pipe 23 in the loop system 26 of the heat source water W.
On the upstream side of the heat source water W while being connected via the pump 30 and the feed side opening / closing valve 33, the inlet side of the tank 29 is connected to the feed pipe 22 of the loop system 26 of the heat source water W for the heat source water. It is connected to the downstream side of the valve 24 via a return side opening / closing valve 34. The pump 21 for feeding the heat source water is configured to function as a pump for feeding the cleaning liquid Q in the tank 29 into the heat exchanger main body 1 at the time of washing, and the tank 29,
The feed side opening / closing valve 33, the return side opening / closing valve 34 and the heat exchanger body 1 constitute a closed loop system 35 of the cleaning liquid Q.

In the heat exchanger for water heat source having the above structure,
During normal operation, for example, during daytime air conditioning, the loop system 26 of the heat source water W operates, and as described above, the heat exchanger body 1
When heat exchange is performed between the heat source water W and the heat medium F in the inside, and when the operation of the loop system 26 is stopped such as at night, the opening / closing valve 33 for the cleaning liquid Q and the return By driving the pump 30 while opening the side opening / closing valve 34, the cleaning liquid Q in the tank 29 is fed into the heat exchanger body 1, so that the heat exchanger body is the same as in the above embodiment. It is possible to wash away slime and the like generated in 1. Further, in this embodiment, since the closed loop system 35 of the cleaning liquid Q is incorporated in a part of the loop system 26 of the heat source water W, the number of parts can be reduced and the facility cost can be reduced. It will be possible.

FIG. 3 is a block diagram showing a heat exchanger for a water heat source according to another embodiment of the present invention. In this embodiment, in the configuration of the embodiment shown in FIG. An electric heater 36, for example, is added as a heating means for raising the temperature of the cleaning liquid Q between the cleaning pump 30 and the cleaning pump 30. Since other configurations are the same as those in FIG. Reference numerals are given and detailed description thereof is omitted.

In the heat exchanger for a water heat source having the structure shown in FIG. 3, the closed loop system 35 for the cleaning liquid Q is used at night or the like.
When the cleaning liquid Q in the tank 29 is operated, the temperature of the cleaning liquid Q in the tank 29 is raised to about 50 ° C. to 100 ° C. by the electric heater 36 and sent into the heat exchanger body 1, so that the decomposition of slime or the like is accelerated. These can be quickly washed off and removed, and as a result, the heat exchange can be efficiently performed.

FIG. 4 is a constitutional view of a heat exchanger for a water heat source showing still another embodiment of the present invention. In this embodiment, FIG.
In the configuration of the embodiment shown in FIG.
In between, as a heating means for raising the temperature of the cleaning liquid Q,
For example, since the electric heater 36 is additionally provided and the other structure is the same as that of FIG. 2, the same reference numerals are given to the corresponding portions, and the detailed description thereof will be omitted.

In the heat exchanger for a water heat source having the structure shown in FIG. 4, the open / close valve 3 on the feed side of the cleaning liquid Q is used at night or the like.
3 and the return side opening / closing valve 34 are opened and the pump 30 is driven to supply the cleaning liquid Q in the tank 29 into the heat exchanger body 1, the tank 29
Since the cleaning liquid Q therein is heated and heated by the electric heater 36 and then fed into the heat exchanger main body 1, as in the case of the embodiment of FIG. It is possible to efficiently wash away and remove the generated slime and the like.

In the embodiments shown in FIGS. 3 and 4, the heating means for raising the temperature of the cleaning liquid is not limited to the electric heater 36, and can be selected appropriately.

[0028]

As described above, according to the first aspect of the present invention, the heat exchanger main body which operates in the loop system of the water heat source during the normal operation is subjected to the above cleaning at the time of cleaning from the tank storing the cleaning liquid. Since a closed loop system for the cleaning liquid that feeds the cleaning liquid is provided, it is easy to remove slime generated when sewage or seawater is used as the heat source water without disassembling the heat exchanger body. In addition to being able to wash away by operation and maintain good heat exchange performance, since the cleaning system is a closed loop, the cleaning liquid can be used repeatedly,
An economical system can be realized by suppressing loss of chemicals such as cleaning agents and water treatment agents. In addition, temperature control and pH control of the cleaning liquid are easy, and the cleaning effect can be easily enhanced.

Further, according to the second aspect of the present invention, since the closed loop system of the cleaning liquid is incorporated in a part of the loop system of the heat source water, the configuration is simplified and the facility cost is reduced. Can be planned.

Further, according to the third and fourth aspects of the present invention, the cleaning liquid is heated by the heating means and fed into the heat exchanger body to sterilize microorganisms causing slime and the like. The effect can be exerted, and the heat exchange efficiency holding effect can be exerted more sufficiently.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a heat exchanger for a water heat source according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a heat exchanger for a water heat source according to another embodiment of the present invention.

FIG. 3 is a configuration diagram showing a heat exchanger for a water heat source according to another embodiment of the present invention.

FIG. 4 is a schematic view showing a heat exchanger for water heat source according to still another embodiment of the present invention.

FIG. 5 is a vertical sectional view showing a conventional heat exchanger for a water heat source.

[Explanation of symbols]

 1 Heat Exchanger Main Body 21 Heat Source Water Supply Pump 22 Feed Pipe 23 Return Pipe 24, 33 Feed Side Open / Close Valve 25, 34 Return Side Open / Close Valve 26 Heat Source Water Loop System 29 Tank 30 Cleaning Liquid Supply Pump 35 Closed loop system for cleaning liquid 36 Electric heater (heating means) Q Cleaning liquid W Heat source water

Claims (4)

[Claims] 1. The heat source water sucked from a water heat source by a heat source water feed pump during normal operation is caused to flow into the heat exchanger body,
And in the heat exchanger for water heat source provided with a heat source water loop system for returning the heat source water after heat exchange to the water heat source, a tank in which the cleaning liquid is stored and the cleaning liquid in the tank at the time of cleaning are A cleaning liquid supply pump that feeds the cleaning liquid into the main body of the exchanger through a feed opening / closing valve that is opened during cleaning, and returns the cleaning liquid after cleaning to the tank through a return opening / closing valve that is opened during cleaning. And a cleaning liquid supply pump, a cleaning liquid feed side opening / closing valve, a cleaning liquid return side opening / closing valve, and a heat exchanger body forming a closed loop system of the cleaning liquid. Heat exchanger for water heat source. 2. The heat source water sucked from the water heat source by the heat source water supply pump during normal operation is caused to flow into the heat exchanger body,
In a heat exchanger for a water heat source provided with a heat source water loop system for returning heat source water after exchanging heat to the water heat source, a feed side that is inserted in a feed pipe in the heat source water loop system and opened during normal operation The inlet side of the tank in which the cleaning liquid is stored is connected to the downstream side of the release valve via a return side opening / closing valve that is opened during cleaning, and is also connected to the return pipe in the loop system to open during normal operation. The outlet side of the tank is connected to the upstream side of the return side opening / closing valve via a feed side opening / closing valve opened during cleaning and a cleaning liquid supply pump, and the pump, tank, and cleaning liquid A heat exchanger for a water heat source, characterized in that a closed loop system for the cleaning liquid is constituted by the feed side opening / closing valve, the cleaning liquid return side opening / closing valve, and the heat exchanger body. 3. The heat source water sucked up from the water heat source by the heat source water supply pump during normal operation is caused to flow into the heat exchanger body,
And in the heat exchanger for water heat source provided with a heat source water loop system for returning the heat source water after heat exchange to the water heat source, heating means for raising the temperature of the cleaning liquid, and the cleaning liquid heated at the time of cleaning A heat exchanger for a water heat source, comprising: a pump for feeding a cleaning liquid to be fed to the heat exchanger body. 4. The temperature of the cleaning liquid is raised from a tank in which the cleaning liquid is stored and sent to the heat exchanger body,
The heat exchanger for water heat source according to claim 3, wherein a closed loop system of the cleaning liquid for returning the cleaning liquid after cleaning to the tank is configured.