JP2000356498A - Heat exchanger and method for scaling heat exchanging tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger having a plurality of heat exchanging tubes for passing liquid in which the heat exchanging tubes can be scaled even during operation, and to provide a method for scaling the heat exchanging tube. SOLUTION: A compressed air nozzle 11 is provided at the inlet of a water tube 4 in a lubricant cooler and a round rod 12 for generating Karman's vortex is positioned in front of the nozzle 11. Compressed air jetted from the compressed air nozzle 11 strikes against the round rod to produce Karman's vortex from the opposite side thereof. The water tube 4 is scaled through combination of vibration incident to Karman's vortex, turbulence of cooling water and bubbles of compressed air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger having a plurality of heat exchange tubes through which a liquid flows, such as an oil cooler or a condenser, and more particularly to the removal of scale attached to the heat exchange tubes. .

[0002]

2. Description of the Related Art For example, in a lubricating oil cooler in which lubricating oil is cooled by a water pipe through which cooling water flows.
Conventionally, when removing dirt (sludge, etc.) or scale (in the present invention, these are simply referred to as scale) attached to the inside of the water pipe, disassemble the lubricating oil cooler once and then clean it with a special tool. It took a lot of effort and time to do that.

In a condenser in which steam is cooled by a water pipe through which cooling water such as seawater flows to obtain condensate, a sponge ball is used as a technique for removing scale adhering to the inside of the water pipe. Is provided by circulating water in the cooling water pipe.

However, in this scale removing technique, it is necessary to attach a device such as a ball collector for collecting sponge balls, a filter, a foreign matter discharge pipe, and the like, so that the cost is increased. Further, when the sponge ball is worn, there is a problem that the sponge ball is discharged together with seawater without being caught by the ball collector.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a heat exchanger having a plurality of heat exchange tubes, such as an oil cooler and a condenser, through which a liquid such as cooling water flows.
It is an object of the present invention to provide a heat exchanger and a method for removing scale inside a heat exchange tube, which can easily remove scale attached to the heat exchange tube even during operation of the equipment.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a heat exchanger having a plurality of heat exchange tubes through which a liquid flows. Provided is a heat exchanger in which a Karman vortex generating rod is arranged in front of the air nozzle.

In the heat exchanger of the present invention, the heat exchanger is protected from the pressure of the compressed air ejected from the compressed air nozzle, and the pressure is released to the outlet of the heat exchange tube and the air is discharged to release the air. Is preferably provided with an outlet valve for use.

Further, in the heat exchanger according to the present invention,
The above-described compressed air nozzle and a rod for generating Karman vortex,
A plurality of heat exchange tubes can be provided, respectively, to effectively remove scale from a large number of heat exchange tubes. As the rod for generating Karman vortex employed in the heat exchanger according to the present invention, it is preferable to use a round bar, but it is not limited to this.

According to the heat exchanger of the present invention described above,
By ejecting compressed air from the attached compressed air nozzle, Karman vortices are generated by the Karman vortex generating rod, and the turbulence, vibration and bubbles remove the dirt scale attached to the heat exchange tube and facilitate Can be removed.

In the heat exchanger according to the present invention, scale can be easily removed from the heat exchange tube by blowing out compressed air from the compressed air nozzle to generate Karman vortices even during operation. The heat exchanger can always be operated with good heat exchange performance without scale adhesion.

In order to solve the above-mentioned problems, the present invention provides a method for removing scale inside a heat exchange tube of a heat exchanger having a plurality of heat exchange tubes through which a liquid flows. A method is employed in which the scale is separated by Karman vortices generated by applying an air jet.

According to the heat exchanger scale removing method of the present invention, the vibration caused by the Karman vortex generated when the air jet hits the rod at the inlet of the heat exchange tube, the turbulent flow of the liquid flowing through the heat exchange tube, In addition, the scale in the heat exchange tube is peeled off and removed by bubbles generated by the air jet. Therefore, according to the heat exchanger scale removing method of the present invention, it is possible to easily clean the inside of the pipe without impairing the heat exchange function even during the operation of the heat exchanger.

Further, in the method for removing heat exchanger scale of the present invention, as in the conventionally provided technology, sponge ball collectors, sponge ball cleaning devices, and other expensive equipment such as filter elements and foreign matter discharge tubes. The heat exchanger scale can be easily removed with an inexpensive configuration without using the heat exchanger, and the heat exchange performance of the heat exchanger can be constantly maintained.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a lubricating oil cooler and a condenser will be described below.

(First Embodiment) First, an embodiment in which the present invention is applied to a lubricating oil cooler (oil cooler) will be specifically described with reference to FIGS. In FIG. 1 showing the overall configuration of a lubricating oil cooler according to the present embodiment, 1
Is a lubricating oil cooler body having a lubricating oil high temperature inlet 2 and a lubricating oil low temperature outlet 3. 4 is a water pipe through which cooling water passes, 5
Is an oil flow adjusting plate provided to bring a large amount of lubricating oil into contact with the outer surface of the water pipe 4.

6 is a water tube support plate, 7 is a cooling water inlet,
River water is used as cooling water. 8 is a cooling water outlet. Reference numeral 10 denotes an open / close valve for a compressed air inlet, and reference numeral 11 denotes a compressed air nozzle. Reference numeral 15 denotes an outlet opening / closing valve for releasing pressure and discharging air when the compressed air is opened into the cooling water by opening the opening / closing valve 10. Reference numeral 16 denotes a discharge pipe attached to the outlet opening / closing valve 15.

The configuration of the compressed air nozzle 11 is shown in FIG. 2, and a round bar 12 for generating Karman vortices is attached by a support member 9 in front of the compressed air nozzle 11. When a compressed air jet from the compressed air nozzle 11 hits the round bar 12, the round bar 12 is moved within a certain Reynolds number range.
In the wake, periodic vortices with opposite rotation directions are generated alternately on both sides, and periodic vortex outflow (so-called Karman vortex) flows away while maintaining a regular arrangement. This is shown in FIG.

In the lubricating oil cooler of FIG. 1 having the above structure, the compressed air nozzle 1 provided at the inlet of the water pipe 4
The compressed air coming out of 1 is jetted onto a round bar 12 attached to the front of the nozzle. As shown in FIG.
In this case, vortices having opposite rotation directions are alternately generated from both sides of the round bar 12 to form Karman vortices flowing away while maintaining a regular arrangement. The dirt scale inside the water pipe 4 is cleaned by the vibration generated by the Karman vortex, the turbulent flow of the cooling water, and the bubbles of the compressed air.

By using the turbulence, vibration and bubbles generated by the Karman vortex, it is possible to remove the dirt scale in the water pipe 4 which cannot be removed by the ordinary flow of the cooling water.
Since the pressure of the compressed air is higher than the pressure of the cooling water, the outlet opening / closing valve 15 and the opening / closing valve 10 are simultaneously opened to protect the cooler and to release air.

FIG. 1 shows one compressed air nozzle 1
Although only one and one round bar 12 are shown, an appropriate number of these may be provided. In addition, the on-off valve 10 and the outlet on-off valve 15 can be configured to perform automatic water pipe washing by being remotely controlled automatically as electric valves.

As described above, in the lubricating oil cooler of the first embodiment, the compressed air nozzle 11
With a simple structure in which a round bar 12 for generating Karman vortices is arranged in front of the compressed air nozzle 11, the dirt scale attached to the water pipe 4 can be peeled and removed.

(Second Embodiment) Next, an embodiment in which the present invention is applied to a condenser will be specifically described with reference to FIG. In FIG. 4, reference numeral 100 denotes a condenser main body, which has a steam inlet 101. From the steam inlet 101, steam discharged from the steam turbine flows. A water pipe 102 for cooling the steam flowing from the steam inlet 101 is provided in the condenser main body 100.

The condenser body 100 is provided with a cooling water (seawater) inlet 105 and a cooling water (seawater) outlet 106, and the cooling water (seawater) flowing from the cooling water inlet 105.
Flows through the water pipe 102 and flows out to the cooling water outlet 106.
Reference numeral 103 denotes condensed water (condensed water), which is formed by cooling the steam flowing from the steam inlet 101 by the water pipe 102. Reference numeral 104 denotes a condensate pump for transferring the condensate 103.

At the inlet of the water pipe 102, a compressed air nozzle 11 is arranged. In the compressed air nozzle 11, a round bar 12 for generating Karman vortices is provided in front of the compressed air nozzle 11 as shown in FIG. Mounted to be located. On / off valves 10 are provided on pipes for sending compressed air to the compressed air nozzle 11, respectively.

Reference numeral 113 denotes a water chamber air reservoir for collecting air jetted from the compressed air nozzle 11. Water chamber air reservoir 11
When air accumulates in the pump 3, an air vent pump 114 is provided which operates according to a command from an air detector (not shown) and discharges excess air out of the system.

In the condenser of FIG. 4 having the above structure, when the cooling water (seawater) flowing from the cooling water inlet 105 is flowing into the water pipe 102, the on-off valve 10 is connected to the cooling water (seawater). Open multiple compressed air nozzles 1
A jet of compressed air is created in the cooling water by 1 and is applied to a round bar 12 for generating Karman vortices to generate Karman vortices.
The water tube 10 is formed by the turbulence and vibration of air bubbles and Karman vortices.
Peel off the dirt scale in 2 and wash. The air after the cleaning action is attached to the water chamber air reservoir 113 attached to the upper part of the condenser.
Thus, the air is discharged outside the system by the air release pump 114.

As described above, in the condenser according to the second embodiment, the compressed air nozzle 11
By using a simple structure in which a round bar 12 for generating Karman vortices is arranged in front of the compressed air nozzle 11, dirt scale attached to the water pipe 102 can be peeled and removed.

As described above, the present invention has been specifically described based on the illustrated embodiments. However, the present invention is not limited to these embodiments, and specific structures within the scope of the present invention shown in the claims are set forth. Needless to say, various changes may be made to the configuration.

For example, in the above embodiment, the round bar 12 is employed as a bar for generating Karman vortices, and the round bar most effectively generates Karman vortices. The shape of the body is not limited to the round bar, but may be other shapes.

In the above-described embodiment, the compressed air nozzle 11 has a structure in which the round bar 12 for generating Karman vortices is supported. The compressed air nozzle may be arranged so as to be disposed in a vessel and to apply compressed air thereto.

[0031]

As described above, according to the present invention, a compressed air nozzle for ejecting compressed air is provided at the inlet of a heat exchange pipe through which a liquid flows, and a rod for generating Karman vortices is provided in front of the compressed air nozzle. A heat exchanger having a body disposed therein is provided.

According to this, Karman vortex is generated by ejecting compressed air from a compressed air nozzle attached to the heat exchanger, and the turbulence, vibration and bubbles remove the dirt scale attached to the heat exchange tube. And can be easily removed.

In the heat exchanger of the present invention, in which the outlet of the heat exchange pipe is provided with an outlet valve for pressure relief and air discharge, heat exchange is performed based on the pressure of the compressed air ejected from the compressed air nozzle. Can protect the vessel. Further, the present invention provides a method for removing a heat exchanger scale, which exfoliates scale in the heat exchange tube by applying a jet of air to the rod at the inlet of the heat exchange tube through which liquid flows to generate Karman vortices. .

According to the heat exchanger scale removing method of the present invention, it is possible to easily clean the inside of the pipe without impairing the heat exchange function even during the operation of the heat exchanger. Moreover, according to the heat exchanger scale removing method of the present invention, the heat exchanger scale can be easily removed with an inexpensive facility such as a compressed air nozzle and a rod, and the heat exchange performance of the heat exchanger is always maintained. Can be done.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the entire structure of a lubricating oil cooler according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a compressed air nozzle and a round bar for generating Karman vortices used in the lubricating oil cooler of FIG. 1;

FIG. 3 is an explanatory diagram showing a state of generation of Karman vortex by a compressed air nozzle and a round bar shown in FIG. 2;

FIG. 4 is a sectional view showing the entire structure of a condenser according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lubricating oil cooler main body 2 Lubricating oil high temperature inlet 3 Lubricating oil low temperature outlet 4 Water pipe 5 Oil flow adjusting plate 6 Water pipe support plate 7 Cooling water inlet 8 Cooling water outlet 9 Supporting member 10 Open / close valve 11 Compressed air nozzle 12 For Karman vortex generation Round bar 15 outlet on-off valve 16 discharge pipe 100 condenser body 101 steam inlet 102 water pipe 103 condensate 104 condensate pump 105 cooling water inlet 106 cooling water outlet 113 water chamber air reservoir 114 air release pump

Claims (5)

[Claims] In a heat exchanger having a plurality of heat exchange tubes through which a liquid flows, a compressed air nozzle for discharging compressed air is provided at an inlet of the heat exchange tube, and a Karman vortex is generated in front of the compressed air nozzle. Heat exchanger characterized by comprising a rod for use in a heat exchanger. 2. The heat exchanger according to claim 1, wherein an outlet valve for releasing pressure and discharging air is provided at an outlet of the heat exchange tube. 3. A heat exchanger according to claim 1, wherein a plurality of said compressed air nozzles and a plurality of rods for generating Karman vortices are provided. 4. The heat exchanger according to claim 1, wherein the rod body for generating Karman vortices is a round bar. 5. A method for removing scale in a heat exchange tube of a heat exchanger having a plurality of heat exchange tubes through which a liquid flows, wherein a Karman vortex is generated by applying an air flow to a rod at an inlet of the heat exchange tube. Causing the scale to peel off, thereby removing the scale in the heat exchange tube.