JP2005337643A - Heat exchanging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanging device comprising a plate type heat exchanger capable of being applied even to a sea water cooling water system. <P>SOLUTION: This heat exchanging device comprises a plurality of first and second fluid chambers alternately formed among a plurality of conductive heat transfer plates stacked in a state of being electrically conducted with each other, flow channels communicated with the plurality of first fluid chambers for supplying and discharging the first liquid, and flow channels communicated with the plurality of second fluid chambers for supplying and discharging the second liquid. The plurality of first and second fluid chambers are divided into a plurality of sections respectively including the first and second fluid chambers, the heat transfer plates are insulated from each other among the sections by insulating members, and direct electric current can be distributed between at least the heat transfer plate of one section and the heat transfer plate of the other section through the first fluid. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat exchange device, and more particularly, to a heat exchange device including a plate heat exchanger.

  As a technique related to this invention, in a heat exchanger in which hot water is introduced into a heat exchange pipe immersed in a seawater container into which seawater flows in and out, the heat exchange pipe is used as a positive electrode, Seawater in which an anode is installed (see, for example, Patent Document 1) or seawater on the surface of a structure in contact with seawater, and an electrocatalyst is provided to generate oxygen from the electrocatalyst to prevent adhesion of marine organisms An antifouling device (for example, refer to Patent Document 2) for a structure in contact with the surface is known.

Japanese Patent Publication No. 1-46595 (column 9, lines 27-37) JP 2002-167725 A (paragraph [0013])

  A heat exchanger is a device that exchanges thermal energy by thermal contact between two types of fluids at different temperatures. Cooling and heating various devices via fluids, condensing and vaporizing fluids, etc. Widely used in In particular, plate heat exchangers are used in various industries as heat exchangers that can save space, lighten the weight of equipment, and have high thermal efficiency.

On the other hand, in a factory where fresh water is used as cooling water, there is a problem that slime and scale adhere to the cooling water system and various obstacles occur.
In thermal power plants and oil refineries that use seawater as cooling water, marine-adherent organisms such as blue mussels, barnacles, hydroworms, and bryozoe, and slime, etc., adhere to the cooling water system, causing various problems. is there.
When these adhere to the heat exchanger, the heat exchange rate is remarkably lowered, and troubles such as blocking or corroding the strainer and the heat exchanger occur.

In particular, in the case of a plate heat exchanger installed in a seawater cooling water system, there is a greater risk of adhesion of the aforementioned mussel etc. than in a fresh water cooling water system plate heat exchanger, and it can be applied even in such an environment. Plate-type heat exchangers have been desired.
The present invention has been made in consideration of such circumstances, and provides a heat exchange device including a plate heat exchanger that can be applied to a seawater cooling water system.

  The present invention relates to a plurality of first and second fluid flow chambers alternately formed between a plurality of conductive heat transfer plates stacked to be electrically conductive with each other, and a plurality of first fluid flow A plurality of first flow paths that communicate with the chamber and respectively supply and discharge the first liquid; and a plurality of flow paths that communicate with the plurality of second liquid flow chambers and respectively supply and discharge the second liquid. And the second fluid chamber are divided into a plurality of sections so that each includes the first and second fluid chambers, and an insulating member that insulates the heat transfer plate between the sections is provided, and heat transfer in at least one section The present invention provides a heat exchange device in which a direct current can be passed through a first liquid between a plate and a heat transfer plate of another section.

  According to this invention, seawater or fresh water is used as the first liquid, and the surface of the heat transfer plate in contact with the first liquid is antifouled by energizing the heat transfer plates of each section through the first liquid. be able to.

  The heat exchange device according to the present invention includes a plurality of first and second fluid flow chambers alternately formed between a plurality of heat transfer plates stacked so as to be electrically connected to each other, and a plurality of first flows. A flow path that communicates with the liquid chamber and supplies and discharges the first liquid, and a flow path that communicates with the plurality of second fluid chambers and supplies and discharges the second liquid, respectively. The first and second fluid chambers are divided into a plurality of sections so that each includes the first and second fluid chambers, and an insulating member is provided to insulate the heat transfer plate between the sections. A direct current can be passed through the first liquid between the heat plate and the heat transfer plate of another section.

In the heat exchange device according to the present invention, by adopting the above-described configuration, for example, an adhesion preventing substance such as oxygen or hydrogen can be generated from the energized heat transfer plate, and the heat transfer plate is in contact with the first liquid. Antifouling of the heat plate can be achieved.
In the heat exchange apparatus according to the present invention, for example, the first liquid can be cooling water such as seawater or fresh water, and the second liquid can be cooling medium, for example, factory circulating water.
In the heat exchange apparatus according to the present invention, the arrangement of the flow paths of the first liquid and the second liquid with respect to the first and second fluid chambers is not particularly limited and can be arbitrarily set.
Moreover, the 1st and 2nd fluid chambers should just be formed alternately in each division, and do not necessarily need to be formed alternately uniformly over all the divisions.

  As the heat transfer plate, a plate made of titanium and a titanium alloy, stainless steel, copper and a copper alloy, nickel and a nickel alloy, or the like is used. It is preferable that an uneven pattern for increasing the heat transfer efficiency is formed on the heat transfer surface of the heat transfer plate.

The heat transfer plate has at least a surface in contact with the first liquid, platinum group metals such as platinum, ruthenium (Ru), iridium (Ir), rhodium (Rh), palladium (Pd), oxides thereof, and other conductivity. A non-metal coating treatment such as a compound (nitride or the like) or conductive diamond is preferably performed from the viewpoint of maintaining conductivity, promoting an electric reaction, protecting a heat transfer plate, and the like.
These coating treatments may be performed on the entire surface or partially as necessary, and various modifications may be performed depending on the purpose. For example, in order to maintain the conductivity and durability of the heat transfer plate, a composite oxide composed of ruthenium oxide (RuO ₂ ) and titanium oxide (TiO ₂ ), iridium oxide (IrO ₂ ) and tantalum oxide (Ta) _A composite oxide composed of ₂ O ₅ ) can be preferably used.

As the insulating member, a plate-shaped insulating material can be suitably used. For example, an insulating plate made of rubber, a resin plate, and a lining or coating thereof can be suitably used.
Examples of the rubber include NBR, IIR, EPDM, FPM, and silicon rubber. Examples of the resin include fluororesin, vinyl chloride, and polypropylene.

The heat exchange device according to the present invention preferably further includes a DC power supply device that supplies the DC current and a switching unit that reverses the polarity of the power supply.
According to such a configuration, when the pH around the heat transfer plate serving as the negative electrode becomes high and a compound such as calcium carbonate or magnesium hydroxide adheres or precipitates on the surface or in the vicinity thereof, the positive electrode and the negative electrode are temporarily connected. The compound can be removed by reversing.
In addition, from the viewpoint of durability of the heat transfer plate and prevention of scale dirt adhesion to the heat transfer plate, the direction of the direct current to be supplied is periodically reversed to reverse the polarity of the energized heat transfer plate. preferable.
Incidentally, the DC power supply is preferably one which can arbitrarily set the output current value, and supplies the DC current is preferably set to 0.0001~10A / dm ^2, more preferably 0.01~3A / dm ² It is.

In the heat exchange apparatus according to the present invention, a chemical such as a slime inhibitor, a scale inhibitor, or a marine organism adhesion inhibitor may be added to at least the first liquid.
Examples of these agents include chlorine agents, bromine agents, phosphonic acid-based polymers, hydrogen peroxide, and surfactants.

In addition, the heat exchange device according to the present invention may include n first flow chambers (n is a natural number) and n second flow chambers.
In addition, the heat exchange device according to the present invention may include n first (n + 1) first flowing liquid chambers and (n + 1) second flowing liquid chambers.
In addition, the heat exchange apparatus according to the present invention may include (n + 1) (n is a natural number) first flowing liquid chambers and n second flowing liquid chambers.

In the heat exchanging device according to the present invention, the plurality of first and second fluid chambers are composed of three first fluid chambers and six second fluid chambers. The heat transfer plate of one section may be connected to the positive electrode of the DC power supply device, and the heat transfer plate of the other section may be connected to the negative electrode of the power supply. .
According to such a configuration, while maintaining the area ratio of the positive electrode and the negative electrode within an appropriate range, the adhesion preventing effect can be more closely exhibited, and precipitation of compounds such as calcium carbonate and magnesium hydroxide can be suppressed. it can. As described above, the direction of the direct current to be supplied is periodically reversed, and the polarity of the energized heat transfer plate is reversed, so that the durability of the heat transfer plate and the adhesion of scale dirt to the heat transfer plate It is preferable from the viewpoint of prevention.

  Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings, but the present invention is not limited thereto. In the plurality of drawings, the same members will be described using the same reference numerals.

Example 1
A heat exchange device according to an embodiment of the present invention will be described with reference to FIGS. 1 is a perspective view of a heat exchange device according to a first embodiment, FIG. 2 is an exploded perspective view, FIG. 3 is a side view, FIG. 4 is a cross-sectional view taken along line AA in FIG. 6 is a sectional view taken along the line CC in FIG. 4, FIG. 7 is a sectional view taken along the line DD in FIG. 5, FIG. 8 is a transverse sectional view of the first section, and FIG.

  As shown in these drawings, the heat exchanging device 100 includes two conductive heat transfer plates 1, 1a, 1b that are alternately stacked so as to be electrically connected to each other. A first flow path 4 and a second flow path 5 are connected to the first flow liquid chamber 2, the four second flow liquid chambers 3, and the two first flow liquid chambers 2 to supply and discharge the first liquid, respectively. And a third flow path 6 and a fourth flow path 7 that communicate with the four second flowing liquid chambers 3 and supply and discharge the second liquid, respectively, and the two first flowing liquid chambers 2 and four The second flowing liquid chamber 3 is divided into a first section 8 and a second section 9 so that each includes the first and second flowing liquid chambers 2 and 3, and the eight heat transfer plates 1, 1a, 1b are divided. Is provided between the first and second sections 8 and 9, and the heat transfer plate 1a of the first section 8 and the heat transfer plate 1 of the second section 9 are provided. It is configured to direct current can power through the first liquid between the.

  The heat transfer plates 1, 1 a, 1 b and the insulating plates 10, 10 a are sandwiched from both ends by the front side frame 11 and the back side frame 12 while being stacked in a predetermined order, and tightened with a plurality of bolts 13 and nuts 14. It has been.

As shown in FIGS. 2, 3 and 9, the first section 8 includes four adjacent heat transfer plates 1, 1a, 1a, 1 and these heat transfer plates 1, 1a, 1a, 1 from both sides. It is mainly comprised from the insulating board 10 to pinch | interpose.
Gaskets 15a and 15b are alternately inserted between adjacent heat transfer plates 1 and 1a. As a result, as shown in FIG. 9, the first flowing liquid chamber 2 and the second flowing liquid chamber 3 are alternately formed, and the first and second flowing liquid chambers 2 and 3 are supplied with the first and second liquids, respectively. By flowing, heat exchange is performed between the first liquid and the second liquid via the heat transfer plate 1a.
Note that gaskets 15c having different shapes are interposed between the insulating plate 10 and the heat transfer plate 1 adjacent thereto. The gasket 15c does not form the first and second fluid chambers 2 and 3 like the other gaskets 15a and 15b, but the first to fourth flow paths continuing from the first section 8 to the second section 9. It is only intended to form 4, 5, 6, and 7.

  On the other hand, the second section 9 has substantially the same configuration as that of the first section 8, but the first to fourth flow paths 4 are provided between the first insulating plate 10a and the heat transfer plate 1b when viewed from the rear frame 12. , 5, 6 and 7 are not formed, and no gasket is interposed between the insulating plate 10a and the heat transfer plate 1b.

The first liquid as the cooling water is supplied from the first introduction port 4a of the front side frame 11 communicating with the first flow path 4 shown in FIG. 1, and passes through each first flowing liquid chamber 2 as shown by the arrows in FIG. As a result, it is discharged from the first discharge port 5a through the second flow path 5 shown in FIG.
On the other hand, the second liquid as the water to be cooled is supplied from the second introduction port 6a of the front-side frame 11 communicating with the third flow path 6 shown in FIG. 1, and each second liquid as shown by the arrow in FIG. After exchanging heat with the first liquid through the chamber 3, it is discharged from the second discharge port 7a via the fourth flow path 7 shown in FIG.
The first liquid supplied from the first introduction port 4a is discharged from the second introduction port 6a through each first flowing liquid chamber 2, and the second liquid supplied from the first discharge port 5a is each second. Each gasket can also be configured so as to be discharged from the second discharge port 7a through the flowing liquid chamber 3.

  As shown in FIGS. 2, 3 and 9, the first and second sections 8 and 9 have terminal portions 16 projecting from the center of the lower end of the heat transfer plate 1a in contact with the first liquid. A terminal 19 provided at the tip of a cord extending from a positive electrode and a negative electrode of a DC constant current power source 17 via a polarity switching mechanism (switching unit) 18 is bolted to the terminal unit 16.

  By the way, as FIG. 4-7 shows, the unevenness | corrugation for enlarging a surface area is formed in the surface and the back surface of the heat-transfer plate 1 and 1a. The heat transfer plates 1 and 1a shown in FIGS. 4 and 5 are substantially the same, and the heat transfer plate 1 shown in FIG. 5 is an upside down version of the heat transfer plate 1a shown in FIG. is there. The structural difference between the heat transfer plate 1 and the heat transfer plate 1a is only the presence or absence of a coating for improving the conductivity described later. When the heat transfer plate 1a shown in FIG. 4 and the heat transfer plate 1 shown in FIG. 5 are alternately stacked, as shown in FIG. 8, one convex portion comes into contact with the other concave portion and becomes electrically conductive. It is designed.

  For this reason, the heat transfer plates 1 and 1a in the same section divided by the insulating plate 10 have the same polarity when energized, and if the heat transfer plates 1 and 1a in the first section are positive. When the polarity is switched by the polarity switching mechanism, the heat transfer plates 1, 1a, 1b in the second section become negative, and the heat transfer plates 1, 1a in the first section 8 become negative, The heat transfer plates 1, 1a, 1b are positive electrodes.

  When a direct current is supplied between the heat transfer plates 1, 1 a of the first section 8 and the heat transfer plates 1, 1 a, 1 b of the second section 9, an insulating plate interposed between the first section 8 and the second section 9 Electricity is supplied through the first liquid without causing a short circuit. At this time, the generation of oxygen or hydrogen from the energized heat transfer plate 1a suppresses the attachment of marine adhering organisms and slime to the heat transfer plate 1a, and the heat exchange capacity can be maintained over a long period of time.

  The polarity switching mechanism 18 also contributes to removing precipitates of compounds such as calcium carbonate and magnesium hydroxide caused by increasing the pH around the heat transfer plate 1a serving as the negative electrode by switching the polarity. To do.

Theoretically, as described above, since the heat transfer plates 1 and 1a in the same section have the same polarity, energization is performed even through the second liquid. By energizing through the liquid, oxygen or hydrogen is generated from the energized heat transfer plate 1a to suppress the adhesion of marine adhering organisms and slime to the heat transfer plate 1a, and the heat exchange capacity is maintained over a long period of time. The purpose is to let you.
For this reason, in this embodiment, the coating for improving the conductivity is applied only to the surface of the heat transfer plate 1a, 1b that contacts the first liquid of the heat transfer plate 1a that contacts the first liquid. Most of the current supplied from the constant current power supply 17 is energized through the first liquid.

Hereinafter, each member which comprises a heat exchange apparatus is demonstrated in detail.
Heat Transfer Plate The heat transfer plates 1, 1a, 1b shown in FIG. 2 are all made of titanium, are usually rectangular, and have a plate thickness of 0.4 to 1.0 mm. As shown in FIGS. 4 and 5, the heat transfer plates 1, 1 a have first to fourth openings 20, 21, 22, 23 corresponding to the first to fourth flow paths 4, 5, 6, 7 at the four corners. Each is formed. Further, as shown in FIGS. 6 and 7, grooves on the surfaces of the heat transfer plates 1 and 1a for fitting the gaskets 15a and 15b and irregularities for increasing the surface area contributing to heat exchange are press-molded. Is formed by.
The contact surface of the heat transfer plate 1a with the first liquid is provided with RuO ₂ coating (film thickness: 0.1 μm) for improving conductivity, and further, a terminal for screwing the terminal from the center of the lower end. The part 16 protrudes.
In addition, as shown in FIG. 2, the first to fourth openings are not formed in the heat transfer plate 1 b arranged on the most back frame side 12.

Gaskets Gaskets 15a, 15b and 15c shown in FIG. 2 are all made of synthetic rubber. The gaskets 15a and 15b are upside down and are substantially the same.

Insulating Plate Each of the insulating plates 10 and 10a shown in FIG. 2 is made of synthetic rubber or resin, or a lining or coating thereof. The insulating plate 10 has first to fourth openings 24, 25, 26, and 27 corresponding to the first to fourth flow paths 4, 5, 6, and 7 at the four corners, respectively. The first to fourth openings are not formed in the disposed insulating plate 10a.

Front Side Frame The front side frame 11 shown in FIG. 2 is made of a rectangular steel plate. Although not shown, stud bolts are embedded around the first and second inlets 4a and 6a and the first and second outlets 5a and 7a, and piping and cooling target for introducing and discharging cooling water. Each flange of the pipe for introducing and discharging water is bolted.

Back Side Frame The back side frame 12 shown in FIG. 2 is made of a rectangular steel plate.

The cooling water as the first liquid and the cooling water as the second liquid are respectively passed through the heat exchange device 100 according to the first embodiment having the above-described configuration, and a predetermined current is continuously supplied from the DC constant current power source 17. Energized.
Here, the cooling water may be either fresh water or seawater. In addition, it is preferable that a chemical such as a slime inhibitor, a scale inhibitor, or a marine organism adhesion inhibitor is injected into the cooling water, but it is not always necessary. That is, even if it is the cooling water in which the chemical | medical agent is not inject | poured, by supplying a predetermined electric current continuously, oxygen or hydrogen will generate | occur | produce from the supplied heat exchanger plate 1a, and adhesion of the deposit | attachment with respect to the heat exchanger plate 1a Prevention is achieved. Of course, the effect is further increased if drugs are used in combination.
The polarity switching by the polarity switching mechanism 18 may be regular or irregular. However, in order to obtain a uniform adhesion preventing effect in the entire apparatus 100, it is preferable to periodically switch the polarity.

Example 2
A heat exchange apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS. FIG. 10 is a side view of the heat exchange device according to the second embodiment, and FIG. 11 is an explanatory diagram of a main part of the heat exchange device according to the second embodiment.

As shown in FIG. 10, the heat exchange apparatus 200 according to the second embodiment adds another section to the heat exchange apparatus 100 according to the first embodiment (see FIG. 3) to add a first section 31, a second section 32, and The third section 33 has a three-section configuration, and via the polarity switching mechanism 18, one section of the heat transfer plate 1 a is used as the positive electrode of the DC constant current power supply 17, and the other two sections of the heat transfer plate 1 a are used as the DC constant current power supply. 17 is connected to the negative electrode.
The configuration of the first and second sections 31 and 32 is the same as that of the first section 8 of the heat exchange device 100 according to the first embodiment, and the configuration of the third section 33 is the second of the heat exchange device 100 according to the first embodiment. It is the same as the structure of the division 9, and the structure of each other part is the same as that of the heat exchange apparatus 100 by the above-mentioned Example 1. FIG.

According to such a configuration, while maintaining the area ratio of the positive electrode and the negative electrode within an appropriate range, the adhesion preventing effect can be more closely exhibited, and precipitation of compounds such as calcium carbonate and magnesium hydroxide can be suppressed. it can.
As in the first embodiment, the polarity can be switched periodically or irregularly by the polarity switching mechanism 18, but in the second embodiment, switching is performed according to the time schedule as shown in Table 1 below as an example, and the time is 5 hours. The subsequent steps will be repeated.

  If switching is performed according to the time schedule as shown in Table 1, oxygen or hydrogen can be generated from the energized heat transfer plate 1a in any section, and a high adhesion preventing effect can be obtained.

  Sea water as a first liquid (cooling water) or sea water to which hydrogen peroxide is added to the heat exchange device 200 according to the second embodiment and factory circulating water in a heated state as a second liquid (cooled water). Water is passed through each of them, and a predetermined current is continuously supplied from the DC constant current power source 17. By continuously energizing a predetermined current, adhesion of deposits can be prevented, and the effect is further increased in seawater to which hydrogen peroxide is added. The reason is considered to be that hydroxy radicals are generated from the heat transfer plate 1a as the negative electrode in the heat exchange device 200, and the adhesion of the deposits is effectively prevented.

It is a perspective view of the heat exchange apparatus by Example 1 of this invention. It is a disassembled perspective view of the heat exchange apparatus shown by FIG. It is a side view of the heat exchange apparatus shown by FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is a cross-sectional view of the first section. It is principal part explanatory drawing of the heat exchange apparatus by Example 1. FIG. It is a side view of the heat exchange apparatus by Example 2 of this invention. It is principal part explanatory drawing of the heat exchange apparatus by Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a, 1b ... Heat-transfer plate 2 ... 1st flow liquid chamber 3 ... 2nd flow liquid chamber 4 ... 1st flow path 4a ... 1st inlet 5 ... 1st 2 flow path 5a ... 1st discharge port 6 ... 3rd flow path 6a ... 2nd introduction port 7 ... 4th flow path 7a ... 2nd discharge port 8, 31 ... 1st 1 section 9, 32 ... 2nd section 10, 10a ... insulating plate 11 ... front side frame 12 ... back side frame 13 ... bolt 14 ... nut 15a, 15b, 15c ... · Gasket 16 ··· Terminal portion 17 ··· DC constant current power supply 18 · · · Polarity switching mechanism 19 · · · Terminal 20 and 24 · · · first opening 21 and 25 · · · second opening 22 and 26 · · · ..Third opening 23, 27 ... Fourth opening 33 ... Third section 100, 200 ... Heat exchange device

Claims (6)

  A plurality of first and second fluid flow chambers alternately formed between a plurality of conductive heat transfer plates stacked to be electrically conductive with each other, and communicated with the plurality of first fluid flow chambers And a plurality of first and second streams, each having a flow path for supplying and discharging the first liquid, and a flow path for supplying and discharging the second liquid respectively connected to the plurality of second flowing liquid chambers. The liquid chamber is divided into a plurality of sections so that each includes the first and second flowing liquid chambers, and an insulating member that insulates the heat transfer plate between the sections is provided, and the heat transfer plate of at least one section and the other A heat exchange device capable of passing a direct current through the first liquid between the heat transfer plates of the section.   The heat exchange apparatus according to claim 1, further comprising: a DC power supply that supplies the DC current; and a switching unit that reverses the polarity of the power supply.   The heat exchanger according to claim 1, wherein one section includes n (n is a natural number) first fluid chambers and n second fluid chambers.   The heat exchange device according to claim 1, wherein one section includes n (n is a natural number) first flowing liquid chambers and (n + 1) second flowing liquid chambers.   The heat exchange device according to claim 1, wherein one section includes (n + 1) (n is a natural number) first fluid chambers and n second fluid chambers.   A plurality of first and second fluid chambers are composed of three first fluid chambers and six second fluid chambers, and one first fluid chamber and two second fluid chambers sandwiching the first fluid chamber. The heat exchange apparatus according to claim 2, wherein the heat transfer plate of one section is connected to the positive electrode of the DC power supply device, and the heat transfer plate of the other section is connected to the negative electrode of the power supply.

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