KR20150096073A - Heat exchanging apparatus and method for preventing fouling the same - Google Patents

Heat exchanging apparatus and method for preventing fouling the same Download PDF

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Publication number
KR20150096073A
KR20150096073A KR1020140017037A KR20140017037A KR20150096073A KR 20150096073 A KR20150096073 A KR 20150096073A KR 1020140017037 A KR1020140017037 A KR 1020140017037A KR 20140017037 A KR20140017037 A KR 20140017037A KR 20150096073 A KR20150096073 A KR 20150096073A
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KR
South Korea
Prior art keywords
fluid
inner tube
fine particles
heat exchange
case
Prior art date
Application number
KR1020140017037A
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Korean (ko)
Inventor
이상구
박세훈
봉춘근
김용구
이상열
Original Assignee
유니엔스(주)
주식회사 그린솔루스
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Application filed by 유니엔스(주), 주식회사 그린솔루스 filed Critical 유니엔스(주)
Priority to KR1020140017037A priority Critical patent/KR20150096073A/en
Publication of KR20150096073A publication Critical patent/KR20150096073A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/004—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using protective electric currents, voltages, cathodes, anodes, electric short-circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G13/00—Appliances or processes not covered by groups F28G1/00 - F28G11/00; Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G7/00—Cleaning by vibration or pressure waves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B6/00—Cleaning by electrostatic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange apparatus and a method of preventing contamination thereof, and more particularly, to a charging apparatus for charging fine particles contained in a first fluid by a corona discharge. A case having an inlet and an outlet formed on both sides thereof for heat exchange after the first fluid transferred from the charging device flows into the case; And a surface of the second fluid that is in contact with the first fluid has a surface energy of 50 mJ / cm or less and provides a flow path of a second fluid having a temperature characteristic different from that of the first fluid, An inner tube allowing heat exchange between fluids; A vibration induced energy generating device mounted on the case and generating energy to cause vibration in the case and the inner pipe surface; And a voltage generating device installed outside the case and applying a voltage to the inner surface of the inner tube so that a surface of the voltage generating device has the same polarity as that of the charged fine particles, To prevent the fine particles on the outer surface of the inner tube from being accumulated by the electrostatic repulsive force and the vibration energy of the inner tube.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger,

The present invention relates to a heat exchange device capable of preventing contamination of an inner surface of an inner pipe and a method of preventing contamination thereof.

Generally, in the case of heating a material in a furnace, exhaust gas generated through a burner for burning a fuel is heated outside the heating furnace after heating the material in the heating furnace, It accounts for the largest percentage of calories.

In this respect, if the exhaust gas heat quantity is reduced or some of the exhaust gas heat quantity is recovered, the overall thermal efficiency can be improved.

According to the installation standard for waste incineration facilities (Annex 7 of Enforcement Regulations of the Wastes Management Act), the temperature of the flue gas measured at the combustion chamber outlet to prevent the generation of dioxins due to incomplete combustion and to reduce the amount of air pollutants generated 850 or more.

In addition, a post-treatment facility (dust collecting facility) is provided to remove the dust contained in the exhaust gas. If the exhaust gas discharged from the combustion chamber is directly supplied to the post-treatment facility, there is a possibility that the post-treatment facility may malfunction due to the influence of the high temperature, so that the cooling facility capable of lowering the exhaust gas temperature to 300 or less, And the facility is placed between the combustion chamber and the post-treatment facility.

A heat exchanger is generally used as the cooling facility or the waste heat recovery facility, and the regeneration of harmful substances such as dioxin can be fundamentally restrained by sufficiently warming the exhaust gas temperature in the heat exchanger.

Most of the heat exchangers have a structure in which the first fluid (a high-temperature exhaust gas discharged from the combustion chamber) flows into an outer pipe into which the second fluid (low-temperature) flows and heat-exchanges.

In this heat exchange process, the dust that has lost its heat sticks to the outer wall of the inner pipe, and the performance of the heat exchanger becomes lower with time. Such contamination of the outer wall of the inner pipe is cleaned by the manager (operator) to clean the contaminated heat transfer surface. However, since this is very troublesome, some use a soot blower.

However, the soot blower is a device that blows out steam or air (jet flow) to the heat transfer surface to remove dust. Therefore, the soot blower can not be used during the operation of the system and the heat surface is corroded ) There is a problem

Korean Unexamined Patent Publication No. 2004-0021991 discloses a method of applying a non-uniform electric field to a fluid flowing into an outer appearance and preventing impurities from adhering to the outer wall of the inner pipe of the heat exchanger by utilizing the difference in dielectric constant between the solid particles and the fluid inside the fluid .

However, the above method is limited to the case where the solid particles in the fluid are polar molecules, and when solid particles that are not made of polar molecules are contained in the fluid, impurities adhere to the outer wall of the inner tube of the heat exchanger It is not easy to apply to various fields because of problems.

An object of the present invention is to provide a heat exchanging device and a method of preventing contamination of the heat exchanging device, which can continuously operate on the outer surface of the inner tube by preventing the fine particles contained in the fluid from accumulating and being contaminated.

It is another object of the present invention to provide a heat exchange apparatus which can be easily applied in the form of particulate matter irrespective of kinds of fine particles contained in a fluid, specifically physical / chemical properties, and a method of preventing contamination of the heat exchange apparatus.

In order to achieve the above object, the present invention provides a charging device for charging fine particles contained in a first fluid by a corona discharge; A case having an inlet and an outlet formed on both sides thereof for heat exchange after the first fluid transferred from the charging device flows into the case; And a surface of the second fluid that is in contact with the first fluid has a surface energy of 50 mJ / cm or less and provides a flow path of a second fluid having a temperature characteristic different from that of the first fluid, An inner tube allowing heat exchange between fluids; A vibration induced energy generating device mounted on the case and generating energy to cause vibration in the case and the inner pipe surface; And a voltage generating device installed outside the case and applying a voltage to the inner surface of the inner tube so that a surface of the voltage generating device has the same polarity as that of the charged fine particles, To prevent the fine particles on the outer surface of the inner tube from being accumulated by the electrostatic repulsive force and the vibrational energy of the inner surface of the inner tube.

The coating layer of the inner tube may contain at least one compound selected from the group consisting of alkoxysilane, silane, silazone and phenylsiloxane.

Preferably, the coating of the inner tube may be hexamethyldisiloxane.

Wherein the vibration-induced energy generating device comprises: a base having an impact surface and mounted on a heat exchanger; a spring rod-shaped supporter mounted on the base, the elastic rod having a first end and a second end, A spring-loaded support fixed to the base; a collision body mounted on a second end of the spring-rod-shaped support; and a collision member disposed in the vicinity of the collision body to selectively move the collision body against the collision surface Wherein the impingement body generates vibrational energy transmitted to the heat exchanger through the base, and the spring rod-like support has, at a first position, the impact body against the biasing force of the spring rod- Is held adjacent to the impact body, and in the second position, Contact with the impact object to generate induced vibrations in the heat exchange system may include the actuator.

The vibration-induced energy generating device may generate a frequency in a range of 200 to 5000.

The fine particles contained in the first fluid may be charged to the negative pole, and the inner surface may form the negative pole.

The case may have an insulating layer formed on an outer surface thereof.

The heat exchanging device may further include a controller capable of selectively driving the vibration induction energy generating device according to a predetermined frequency.

The present invention also provides a method for charging a charged particle, comprising: charging a first fluid containing fine particles into a charging device to uniformalize charged particles; Circulating a first fluid including the charged fine particles into a case and circulating the first fluid; Performing a heat exchange between the first fluid and the second fluid by injecting a second fluid having a temperature characteristic different from the first fluid into an inner tube having a coating layer having a surface energy of 50 mJ / Applying a voltage to the inner surface of the inner tube to have the same polarity as the charged fine particles; Generating energy to induce vibration in the case; And preventing the accumulation of fine particles on the outer surface of the inner tube by electrostatic repulsive force and vibration energy between the charged fine particles and the voltage applied to the inner tube.

The heat exchanging device of the present invention has an advantage that the fine particles contained in the fluid do not adhere to the inner surface of the inner tube and a separate cleaning process for removing the adhered fine particles is not required conventionally.

In addition, the heat exchanger of the present invention is advantageous in that the operation of the heat exchanger is not stopped or restarted in order to perform the cleaning process, so that the occurrence of the work load can be reduced and the heat exchanger can be continuously operated.

Further, the heat exchanger of the present invention has an advantage that it can be applied to various fields in which a fluid having a particulate phase is used regardless of the physical / chemical characteristics of the fine particle.

Especially, when the present invention is applied to a process for heat-exchanging exhaust gas such as a waste incineration process containing a large amount of impurities, a coke gas purification process, etc., convenience and stability of operation can be remarkably improved.

1 is a schematic view of a heat exchange apparatus according to an embodiment of the present invention.

The present invention relates to a heat exchange device capable of preventing contamination of an inner surface of an inner pipe and a method of preventing contamination thereof.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a heat exchanger according to an embodiment of the present invention. FIG. 1 shows a breech-type structure in which a plurality of small inner tubes 30 are inserted into a large-sized case 20, and the inner tube has a bent shape.

The tube type is a type of heat exchanger commonly used in the art. In the case of a high-flow fluid and a low-fluid flow, the same flow flows in the same direction, the flow in the opposite direction flows in a counter flow type, do.

FIG. 1 is a cross-sectional view of a heat exchanger of a direct current type, but the present invention is not limited thereto.

Specifically, a charging device (10) for charging fine particles contained in a first fluid by a corona discharge; A case 20 having an inlet and an outlet formed on both sides thereof for heat exchange after the first fluid transferred from the charging device flows into the case; And a surface of the second fluid that is in contact with the first fluid has a surface energy of 50 mJ / cm or less and provides a flow path of a second fluid having a temperature characteristic different from that of the first fluid, An inner tube (30) enabling heat exchange between fluids; A vibration induced energy generating device (50) mounted on the case, for generating energy to cause vibration in the case and the inner pipe surface; And a voltage generator (40) installed outside the case and applying a voltage to the inner surface of the inner tube so that its surface has the same polarity as the charged fine particles.

The heat exchanger prevents accumulation of fine particles on the inner surface of the inner tube by electrostatic repulsive force and vibration energy between the charged fine particles and the voltage applied to the inner tube.

The charging device 10 is provided at the front portion of the case, that is, at the inlet portion 31 of the first fluid of the charging device, and charges the fine particles contained in the first fluid. The fine particles are substances which can be contaminated on the outer surface of the inner tube by being contained in exhaust gas or the like discharged after various processes.

(Not shown), a discharge plate (not shown), a discharge bar high voltage device (not shown) or the like is used for the first fluid introduced into the charging device 10 by supplying the first fluid containing the fine particles So that the corona discharge is charged on the fine particle surface. At this time, the structure and configuration of the charging device 10 are not particularly limited as long as the charging device 10 is generally used in the art and can charge the surface of the fine particle by the corona discharge.

The case 20 includes an inlet 21 connected to the charging device so that the first fluid transferred from the charging device flows into the charging device, and a first fluid formed on the opposite side of the inlet and including charged fine particles, As shown in FIG. The case 20 provides a path for the flow of the first fluid in its longitudinal direction.

A small inner tube 30 is provided in a bent shape inside the case 20 and an inner tube 30 is provided in a zigzag shape so that a contact area between the first fluid flowing into the case 20 and the surface of the inner tube 30 is wide. Resulting in the curvature of the shape.

The inner tube 30 is connected to the inlet 31 and the outlet 33 to receive the second fluid from the inlet 31 of the inner tube and discharge it to the outlet 33 of the inner tube. The inner tube 30 provides a flow path for the second fluid.

The first fluid including the charged fine particles flowing into the case 20 and the second fluid flowing into the inner tube 30 have different temperature characteristics from each other and heat exchange is performed therebetween.

The materials of the case 20 and the inner tube 30 used in the present invention are not particularly limited as they are generally used in the art. Specifically, the case 20 and the inner tube 30 are made of aluminum or an aluminum alloy, and the inner surface of the case 20 and the outer surface of the inner tube 30 are formed by sequentially chemically plating nickel and copper on the aluminum, Layer and a copper layer are preferably formed.

The nickel layer and the copper layer formed by the chemical plating function to prevent the aluminum inside the heat exchanger from being damaged by the corrosion and to perform smooth heat exchange by the uniform heat conduction.

Further, the inner tube 30 forms a coating layer having a surface energy of 50 mJ / cm or less, preferably 21 to 45 mJ / cm 2 on the surface in contact with the first fluid. The coating layer can prevent the deposition of contaminants on the inner tube surface due to the low adhesive strength with the particles causing the contaminants and the corrosion of the surface due to the deposited contaminants.

Such a coating layer contains at least one compound selected from the group consisting of alkoxysilane, silane, silazone and phenylsiloxane, preferably hexamethyldisiloxane.

The coating layer may be formed by a method selected from the group consisting of electrolytic plating, thermal spray coating, laser deposition, sputtering, physical vapor deposition, chemical vapor deposition, plasma powder overlay welding, cladding and diffusion bonding Can be carried out in one or more ways.

The vibration induced energy generating device 50 is a device for inducing vibration in the heat exchanger. The vibration-induced energy generating device is not particularly limited as long as it can induce vibration.

A spring loaded support mounted to the base, the elastic rod having a first end and a second end, the first end being connected to the base, An impact body mounted on a second end of the spring rod-shaped support, and an actuator disposed in the vicinity of the impact body for selectively actuating the impact body to move the impact body relative to the impact surface Wherein the impact body generates vibrational energy which is transmitted to the heat exchanger through the base, the spring rod-like support being configured such that, in a first position, the impact body is adjacent to the impact body against the biasing force of the spring rod- And in the second position, the impact object comes into contact with the impact surface, And an actuator for generating copper into the heat exchange system.

Preferably, the vibration induced energy generating device 50 is connected to a controller 60 for controlling a force applied to the heat exchanger. The controller 60 can be provided with a sensor 62 coupled to the heat exchanger that can be provided in a communicative relationship so that the applied force is minimized The vibration is measured to adjust the frequency and amplitude output of the vibration induced energy generating device 50 so as to realize the shear wave in the fluid, and data is provided to the controller 60.

The controller 60 may be any known type of processor including an electrical microprocessor that is located at a particular location or remotely to generate a signal for driving the vibration induced energy generating device 50 with any necessary amplification. have. The controller 60 may include a signal generator, a signal filter and an amplifier, and a digital signal processing unit.

The vibration induced energy generating device 50 is designed to induce vibration while maintaining the structural integrity of the heat exchanger. If desired, the array of vibration-inducing energy generators 50 may be distributed in a three-dimensional manner to generate a predetermined dynamic signal for achieving an optimum frequency of oscillation.

The frequency for the vibration can be appropriately selected depending on the design of the heat exchanger and the type of the vibration-induced energy generating device used. At this time, it is preferable to determine the optimum frequency by giving sufficient energy to avoid accumulation of contaminants on the inner tube surface while avoiding damage to the heat exchanger parts.

It is desirable that the drive frequency be different from the natural frequency of the heat exchange portion because matching the composition to the elastic mode can damage the heat exchanger components.

Therefore, the range of 200 to 5000, preferably 500 to 1000 is preferable in a state of avoiding the resonant frequency of the heat exchange structure

The present invention also forms a voltage on the outer surface of the inner tube so as to have the same polarity as the charged fine particles. Specifically, the fine particles are charged with (-) polarity, and (-) voltage is applied to the outer surface of the inner pipe 30.

(-) voltage is applied to the outer surface of the inner tube to generate electrostatic repulsive force, the fine particles charged on the outer surface of the inner tube 30 are prevented from accumulating on the outer surface of the inner tube 30 can do.

The voltage applied to the outer surface of the inner tube 30 preferably employs a voltage generator 40, which is commonly used in the art, such that the voltage has the same polarity of the charged fine particles. Specifically, when the charged particles are charged with (-) polarity, a negative voltage is applied to the outer surface of the inner tube using a negative voltage generator.

Further, the case 20 may have an insulating resin layer formed on the outer surface thereof.

The insulating resin layer contains an insulating polymer material commonly used in the art, for example, polyethylene terephthalate, polyvinyl alcohol, polyimide, and polyepoxy. Polyimide is preferred from the viewpoint of double heat resistance.

In order to insulate the case 20 from the inner tube 30 to which a voltage is applied, an insulating resin portion containing the insulating polymer material may be additionally formed in a space where the case and the inner tube are in contact with each other. The thickness of the insulating portion formed between the case and the inner tube may be 25-100.

A drain (not shown) for opening and closing the valve may be provided at the lower end of the case so that contaminants such as sludge or slurry accumulated on the inner bottom can be intermittently treated (water cleaning, etc.).

Meanwhile, the present invention is characterized by a method for preventing contamination of the heat exchanger using the above-mentioned apparatus.

Specifically, a method of preventing contamination of a heat exchanger includes charging a first fluid containing fine particles into a charging device to unload the fine particles with a polarity; Circulating a first fluid including the charged fine particles into a case and circulating the first fluid; Performing a heat exchange between the first fluid and the second fluid by injecting a second fluid having a temperature characteristic different from the first fluid into an inner tube having a coating layer having a surface energy of 50 mJ / Applying a voltage to the inner surface of the inner tube to have the same polarity as the charged fine particles; Generating energy to induce vibration in the case; And preventing accumulation of fine particles on the inner surface of the inner tube by electrostatic repulsive force and vibration energy between the charged fine particles and the voltage applied to the inner tube.

The voltage application may be continuously or non-continuously applied to the inner tube surface during the operation of the heat exchanger, but it is preferable that the voltage is applied at 0.1 kv / cm or more in consideration of repulsion between the particles and the surface.

The intensity of the normal voltage and the voltage application period can be appropriately changed in consideration of the kind, quantity and diameter of the fine particles contained in the first fluid.

Specifically, the intensity of the voltage applied to the heat exchanger is preferably 0.1 kv / cm or more.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Various modifications and variations are possible within the scope of the appended claims.

10: Charging device
20: Case
21: first fluid inlet
23: first fluid outlet
30: Inner pipe
31: second fluid inlet
33: second fluid outlet
40: Voltage generator
50: Vibration Induced Energy Generator
60: controller
62: Sensor

Claims (10)

A charging device for charging fine particles contained in the first fluid by a corona discharge;
A case having an inlet and an outlet formed on both sides thereof for heat exchange after the first fluid transferred from the charging device flows into the case;
And a surface of the second fluid that is in contact with the first fluid has a surface energy of 50 mJ / cm or less and provides a flow path of a second fluid having a temperature characteristic different from that of the first fluid, An inner tube allowing heat exchange between fluids;
A vibration induced energy generating device mounted on the case and generating energy to cause vibration in the case and the inner pipe surface; And
And a voltage generator installed outside the case and applying a voltage to the inner surface of the inner tube so that the surface of the inner tube has the same polarity as the charged fine particles,
To prevent accumulation of fine particles on the inner surface of the inner tube by electrostatic repulsive force and vibration energy between the charged fine particles and the voltage applied to the inner tube.
The heat exchange apparatus according to claim 1, wherein the coating layer of the inner tube contains at least one compound selected from the group consisting of alkoxysilane, silane, silazone and phenylsiloxane.
The heat exchange apparatus according to claim 2, wherein the coating layer of the inner tube is hexamethyldisiloxane.
The vibration-induced energy generating device according to claim 1, wherein the vibration-induced energy generating device comprises: a base having a collision surface and mounted on a heat exchanger; a spring rod-shaped supporter mounted on the base, the elastic rod having a first end and a second end , The first end of which is fixed to the base, the spring rod-like support, an impact object mounted on the second end of the spring rod-like support, and a contact member disposed in the vicinity of the impactor so that the impactor moves An actuator for selectively activating said impact object, said impact object generating vibrational energy transmitted to said heat exchanger through said base, said spring rod-like support having, at a first position, a deflection of said spring rod- Abutting against said force, and in a second position, said impeller Body heat exchange apparatus of the impact body vibration induced by contact with the impact surface; and a, the actuator which generates in the heat exchange system.
The heat exchange apparatus according to claim 1 or 4, wherein the vibration-induced energy generating device generates a frequency in a range of 200 to 5000.
The heat exchange apparatus according to claim 1, wherein the fine particles contained in the first fluid are charged to the negative pole and the inner surface of the negative pole forms the negative pole.
The heat exchange apparatus according to claim 1, wherein the case has an insulating layer formed on an outer surface thereof.
The heat exchange apparatus of claim 1, wherein the heat exchange apparatus further comprises a controller capable of selectively driving the vibration induction energy generating device according to a predetermined frequency.
Charging a first fluid containing fine particles into the charging device to unload the fine particles with unipolarity;
Circulating a first fluid including the charged fine particles into a case and circulating the first fluid;
Performing a heat exchange between the first fluid and the second fluid by injecting a second fluid having a temperature characteristic different from the first fluid into an inner tube having a coating layer having a surface energy of 50 mJ /
Applying a voltage to the inner surface of the inner tube to have the same polarity as the charged fine particles;
Generating energy to induce vibration in the case; And
Preventing the accumulation of fine particles on the inner surface of the inner tube by electrostatic repulsion and vibrational energy between the charged fine particles and the voltage applied to the inner tube.
The method according to claim 9, wherein the fine particles contained in the first fluid are charged to a negative pole, and the inner surface of the inner fluid pipe forms a negative pole using a negative voltage generator.
KR1020140017037A 2014-02-14 2014-02-14 Heat exchanging apparatus and method for preventing fouling the same KR20150096073A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190120570A1 (en) * 2017-10-23 2019-04-25 Toyota Jidosha Kabushiki Kaisha Heat exchanger
CN114000908A (en) * 2021-11-08 2022-02-01 中国矿业大学 Modularized air cooler for underground tunnel or tunnel and use method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190120570A1 (en) * 2017-10-23 2019-04-25 Toyota Jidosha Kabushiki Kaisha Heat exchanger
CN114000908A (en) * 2021-11-08 2022-02-01 中国矿业大学 Modularized air cooler for underground tunnel or tunnel and use method
CN114000908B (en) * 2021-11-08 2024-05-07 中国矿业大学 Modularized air cooler for underground tunnel or tunnel and use method

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