KR101592880B1 - Apparatus and method for chemical cleaning a heat exchanger - Google Patents

Abstract

The present invention is to provide a chemical cleaning apparatus and method of a heat exchanger to provide efficient cleaning of the heat exchanger by inputting and circulating only a cleaning fluid to a heat exchanger pipeline without disassembling the heat exchanger. The chemical cleaning apparatus comprises: a storage tank which stores and stirs a cleaning fluid; a heater which raises the temperature of the cleaning fluid stored in the storage tank; a fluid circulation pipeline which is connected to the inlet side and outlet side of a water supply pipe or a steam pipe of the heat exchanger by using a hose shank coupler positioned on one side; multiple pipeline valves which block or pass the flow of the cleaning fluid in the fluid circulation pipeline; a circulation pump which allows the cleaning fluid stored in the storage tank to be pumped into the fluid circulation pipeline to circulate the heat exchanger; and a drain valve which is positioned at a lower end of the storage tank, and discharges the cleaning fluid in the storage tank after finishing a cleaning operation of the heat exchanger.

Description

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

The present invention relates to a cleaning apparatus and method for a heat exchanger, and more particularly, to an apparatus and a method for effectively cleaning a heat exchanger with efficient cleaning and user convenience.

Generally, heat exchangers installed in houses, apartments, buildings, factories and the like are used for a long period of time. However, as time passes, various organic or inorganic substances are deposited on the heat plate and fouling such as scale or slime is formed therein, The heat transfer efficiency is lowered and the lifetime is shortened.

Therefore, in order to keep the heat exchanger efficiency constant, it is necessary to periodically clean the inside of the heat exchanger in a situation where maintenance is required. At this time, it is not easy to clean the heat exchanger as it is, and a mechanical method of decomposing and cleaning the heat exchanger is used. The mechanical method of disassembling and cleaning the heat exchanger is labor-intensive, time-consuming, and costly. This causes many inconveniences and difficulties to the user, and also causes a problem of parts such as gaskets being damaged.

As a method for solving such a problem, Korean Patent No. 10-0472308 discloses an improved method for cleaning a heat exchanger, wherein a cleaning ball of a predetermined size is poured into a pipe along with the flow of treated water, and the cleaning ball collides with the inner wall of the pipe, Thereby eliminating the fouling that has been applied to the surface.

However, when the circulating cleaning ball is contaminated, it is necessary to remove the cleaning ball from the automatic cleaning device line of the heat exchanger and clean it. Since the cleaning ball must be drawn into or withdrawn from the channel by the strong pressure of the ejector, A large amount of power is required, and when the cleaning ball is worn, it can not be separately separated, resulting in a secondary contamination due to the cleaning ball.

Patent Registration No. 10-1109103: Heat exchanger cleaning device

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a chemical cleaning apparatus and method of a heat exchanger that provides efficient cleaning of a heat exchanger by circulating a cleaning liquid only through a heat exchanger without decomposing the heat exchanger It has its purpose.

Other objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to another aspect of the present invention, there is provided a chemical cleaning apparatus for a heat exchanger, comprising: a storage tank for storing and mixing a cleaning liquid; a heater for raising the temperature of the cleaning liquid stored in the storage tank; a fluid circulation line connected to an inlet side and an outlet side of the water supply pipe or the steam pipe of the heat exchanger by using a hose shank coupler and a plurality of pipe valves for blocking or passing the flow of the rinse solution through the fluid circulation pipe, A circulation pump for circulating the washing liquid stored in the storage tank through a fluid circulation line to circulate the heat exchanger; a drain valve positioned at a lower end of the storage tank for discharging the washing liquid in the storage tank after the washing operation of the heat exchanger is completed; .

Preferably, the conduit valves are configured to change the flow direction of the cleaning liquid flowing through switching of the conduit valves to forward or backward direction when introducing the cleaning liquid, which is drawn into the fluid circulation conduit through the circulation pump, into the heat exchanger do.

Preferably, the conduit valves include a first conduit valve (V1) located between the fluid circulation conduit and a fluid connection conduit connected to the fluid inlet side where the cleaning fluid is introduced into the storage tank at the other side, , A third conduit valve (V3) connected to the first conduit valve (V1) at one side and a fluid circulation conduit connected to the fluid inlet side of the storage tank at the other side, and a third conduit valve V1) and the third conduit valve (V3), and a second conduit valve (V2) connected between the circulation pump and the fluid circulation conduit, the second conduit valve (V2) being connected to the inlet side of the heat exchanger And a fifth conduit valve (V5) located between the fluid circulation conduit and the fluid circulation conduit. The fifth conduit valve (V5) is connected to the fluid inlet side through which the cleaning liquid is introduced into the storage tank on the other side. And the fifth is connected to the conduit between the valve (V5), characterized in that comprising a fourth conduit valve (V4) which is located between the fluid circulating pipe is connected to the circulation pump on the other side.

According to an aspect of the present invention, there is provided a chemical cleaning method for a heat exchanger, comprising the steps of: (A) using a hose shank coupler located at one side of a fluid circulation conduit, (B) a step of connecting the mixed liquid containing the cleaning liquid stored in the storage tank to the heater and the heat exchanger, (C) controlling the conduit valves so that the fluid circulation of the mixed liquid stored in the storage tank can be forwardly circulated to the heat exchanger when the preheating of the mixed liquid is completed, and then performing the forward cleaning And (D) if the forward cleaning time exceeds a predetermined time, the fluid circulation of the mixed liquid stored in the storage tank is reversed to the heat exchanger, (E) adding a neutralizing solution to the washed cleaning solution when the forward cleaning and backward cleaning are both completed, thereby obtaining a pH of the cleaning solution at pH 6.5 to 7.5 (F) separating the heat exchanger and the heat exchanger chemical cleaning device from each other after the neutralization process is completed, and then opening the drain valve located at the lower end of the storage tank to discharge the mixed liquid in the storage tank (G) filling the storage tank with a cleaning liquid (water), connecting the fluid inlet and the fluid outlet of the chemical washing apparatus of the heat exchanger using a hose shank coupler located at one side of the fluid circulation duct, And a step of operating the circulation pump to wash the inside of the heat exchanger chemical cleaning apparatus, the piping and the lake using the circulation of the cleaning liquid stored in the storage tank I can.

Preferably, the step (B) includes the steps of: (B1) controlling conduit valves so that a mixed fluid containing a cleaning liquid stored in a storage tank is circulated only from a fluid outlet to a fluid inlet, (B2) And circulating the mixed liquid stored in the storage tank until the mixed liquid temperature rises to 70 ° C or higher at room temperature (25 ° C) by raising the power supply of the pump.

Preferably, in the step (B1), the second conduit valve V2 and the third conduit valve V3 are kept open and the first, fourth and fifth conduit valves V1, V4 and V5 are locked and controls the conduit valves to maintain a closed state.

Preferably, the step (C) includes the steps of: stopping the power supply to the circulation pump; controlling the conduit valves so that the fluid circulation of the mixed solution stored in the storage tank can be forwardly circulated to the heat exchanger; And performing the steps of:

Preferably, the control of the conduit valves which can be circulated in the forward direction maintains the open state of the first conduit valve V1, the third conduit valve V3 and the fourth conduit valve V4, And the piping valves V2 and V5 are kept in a locked state.

Preferably, the step (D) includes the steps of stopping the power supply to the circulation pump, controlling the conduit valves so that the fluid circulation of the mixed liquid stored in the storage tank can be reversely circulated to the heat exchanger, And performing the steps of:

The control of the conduit valves that can be reversely circulated preferably maintains the open state of the first conduit valve V1, the second conduit valve V2 and the fifth conduit valve V5, And the pipeline valves V3 and V4 are kept in a locked state.

Preferably, the neutralizing solution of step (E) can be added according to the concentration of the pH, and the circulation time can be changed.

Preferably, the step (F) is performed by performing the forward cleaning and reverse washing processes of the steps (C) and (D) through the control of the conduit valves to clean the inside of the heat exchanger chemical cleaning apparatus, do.

As described above, according to the present invention, since only the cleaning liquid is poured into the heat exchanger pipe and circulated to clean the heat exchanger, the heat exchanger for cleaning does not need to be disassembled, In addition, there is an effect that maintenance time and cost can be reduced.

In addition, since the heat exchanger can be cleaned through the simple control of the fluid circulation pump and various valves, it is possible to provide more convenience to the user, and it is possible to provide a perfect cleaning of the heat exchanger through the chemical cleaning method.

1 is a front view showing a configuration of a chemical exchanger for a heat exchanger of the present invention,
FIG. 2 is an overall configuration diagram of a heat exchanger chemical cleaning apparatus of the present invention and a heat exchanger,
3 is a flowchart illustrating a chemical cleaning method for a heat exchanger according to an embodiment of the present invention,
4A to 4D are diagrams for explaining each step of the chemical washing method of the heat exchanger of FIG. 3 in detail.

Other objects, features and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a chemical washing apparatus and method of a heat exchanger according to the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It is provided to let you know. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

FIG. 1 is a front view showing the construction of a chemical washing apparatus for a heat exchanger according to the present invention, and FIG. 2 is an overall view showing a chemical washing apparatus for a heat exchanger and a heat exchanger connected to each other.

As shown in FIGS. 1 and 2, a storage tank 110 for storing and mixing the cleaning liquid, a heater 120 for raising the temperature of the cleaning liquid stored in the storage tank 110, A fluid circulation line 130 connected to an inlet side and an outlet side of a water supply pipe or a steam pipe of the heat exchanger 200 using a hose shank coupler 111, A circulation pump 150 for circulating the washer fluid stored in the storage tank 110 through the fluid circulation conduit 130 to circulate the heat exchanger 200, And a drain valve 160 located at the lower end of the storage tank 110 and discharging the cleaning liquid in the storage tank 110 after the cleaning operation of the heat exchanger 200 is completed.

In this case, when the cleaning liquid introduced into the fluid circulation line 130 is introduced into the heat exchanger 200 through the circulation pump 150, the conduit valves 140 change the inflow direction of the introduced cleaning liquid in the forward or reverse direction And is controlled through switching of the conduit valves V1 to V5. It is to be understood that the construction of the channel valves 140 may be variously modified within the scope of the technical idea of the present invention, since the channel valves 140 may be constructed in various forms.

The configuration of the pipeline valves 140 shown in FIG. 2 is one preferred embodiment for the description of the technology, and will be described in detail in this specification for convenience of explanation. However, it should be noted that this is not a limitation.

As shown in FIG. 2, the channel valves 140 are provided at one side with a lake connector 111 connected to the outlet side 220 of the heat exchanger 200, and at the other side with a storage tank 110, A first conduit valve V1 positioned between a fluid circulation conduit 130 connected to a fluid inlet side of the storage tank 110 and a second conduit V1 connected to the first conduit valve V1 at one side and a fluid inlet side A third conduit valve V3 disposed between the first conduit valve V1 and the third conduit valve V2 at one side and a circulation pump 150 A second pipe valve V2 positioned between the fluid circulation pipe 130 and the fluid circulation pipe 130 connected to the inlet side 210 of the heat exchanger 200, (130) that is connected to the fluid inlet side through which the cleaning liquid flows into the fluid circulation conduit (110) And a circulation pump 150 connected to the other side of the fifth channel valve V5 and a fifth channel valve V5 connected to the inlet side 210 of the heat exchanger 200, And a fourth conduit valve (V4) positioned between the fluid circulation conduit (130) and the fourth conduit conduit (130).

The operation of the heat exchanger chemical cleaning apparatus according to the present invention will now be described in detail with reference to the accompanying drawings. Like reference numerals in FIG. 1 or FIG. 2 denote the same members performing the same function.

3 is a flowchart illustrating a chemical cleaning method of a heat exchanger according to an embodiment of the present invention.

3, a hose shank coupler 111 located at one side of the fluid circulation line 130 is used to connect a water line or a steam line of the heat exchanger 200, The inlet and outlet sides of the pipe are connected to each other, and all of the pipe valves V1 to V5 are kept closed to prepare for the heat exchanger cleaning (S10).

Next, the conduit valves 140 are controlled to connect the fluid circulation conduit 130 such that the mixed fluid containing the cleaning fluid stored in the storage tank 110 is circulated only from the fluid outlet to the fluid inlet. The heater 120 and the circulation pump 150 are powered up and the mixed solution stored in the storage tank 110 is circulated until the temperature of the mixture reaches 50 ° C to 70 ° C or more at room temperature (25 ° C) (S 20) .

4B, the second conduit valve V2 and the third conduit valve V3 are kept open while the conduit valves 140 are opened during the preheating of the cleaning liquid, , And the five-pipe valves (V1, V4, V5) are kept closed.

After the preheating of the mixed liquid is completed (S20), the circulation pump 150 is stopped, and the pipe valves 140 are opened to allow the fluid circulation of the mixed liquid stored in the storage tank 110 to be forwardly circulated to the heat exchanger After the control, the power of the circulation pump 150 is raised to perform forward cleaning (S30). Since the operation of the pipeline valves 140 without stopping the circulation pump 150 may cause an overload of the circulation pump 150, the power of the circulation pump 150 may be supplied before the pipeline valves 140 are operated It is preferable to stop the operation.

4C, the first conduit valve V1, the third conduit valve V3 and the fourth conduit valve V4 are opened in a state in which the first conduit valve V1, the third conduit valve V3, and the fourth conduit valve V4 are opened And the second and fifth conduit valves V2 and V5 maintain the locked state.

After the predetermined washing time has elapsed for a predetermined period of time, the circulation pump 150 is stopped, and the fluid circulation of the mixed fluid stored in the storage tank 110 is reversely circulated to the heat exchanger 140 And then the backwashing is performed by raising the power of the circulation pump 150 (S40). Since the operation of the pipeline valves 140 without stopping the circulation pump 150 may cause an overload of the circulation pump 150, the power of the circulation pump 150 may be supplied before the pipeline valves 140 are operated It is preferable to stop the operation.

4D, the first pipeline valve V1, the second pipeline valve V2 and the fifth pipeline valve V5 are opened in the backward cleaning mode, And the third and fourth conduit valves V3 and V4 maintain the locked state.

At this time, the mixed solution stored in the storage tank 110 is a chemical cleaning agent in which a cleaning solution and water are mixed, and is subjected to a neutralization process by mixing with water through fluid circulation until the hydrogen ion concentration of the cleaning solution reaches pH 6.5 to 7.5 (S50). On the other hand, if the pH value of the cleaning liquid can not be obtained even after the fluid circulation, a neutralizing liquid may be added.

When the neutralization process is completed (S50), the power of the heater 120 and the circulation pump 150 is turned off, the heat exchanger 200 and the heat exchanger chemical cleaning apparatus 100 are separated from each other, The drain valve 160 located at the lower end of the storage tank 110 is opened to discharge the mixed liquid in the storage tank 110 (S60).

The storage tank is then filled with clean water and connected to the fluid inlet and the fluid outlet of the heat exchanger chemical cleaning apparatus using a hose shank coupler 111 located at one side of the fluid circulation line 130. Then, the circulation pump 150 is operated to circulate the water stored in the storage tank to wash the inside of the heat exchanger chemical cleaning apparatus, the piping and the lake (S70). At this time, during the washing of the inside of the heat exchanger chemical cleaning apparatus 100, the forward washing and reverse washing processes described above are performed through the control of the duct valves 140 to wash the inside of the heat exchanger chemical washing apparatus, do.

For reference, the cleaning time of the heat exchanger chemical cleaning apparatus is not determined, and the time is determined depending on the working environment and the convenience of the user.

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. It will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (12)

A storage tank for storing and mixing the cleaning liquid;
A heater for raising the temperature of the cleaning liquid stored in the storage tank;
A fluid circulation conduit connected to an inlet side and an outlet side of a water supply pipe or a steam pipe of the heat exchanger using a hose shank coupler located at one side;
A plurality of conduit valves for blocking or passing the flow of the cleaning liquid through the fluid circulation conduit;
A circulation pump for circulating the washing liquid stored in the storage tank through a fluid circulation line to circulate the heat exchanger; And
And a drain valve located at a lower end of the storage tank for discharging the cleaning liquid in the storage tank after the cleaning operation of the heat exchanger is completed,
The conduit valves,
A first conduit valve (V1) positioned between the fluid circulation conduit and the fluid circulation conduit, the first conduit valve (V1) being located at one side thereof and the fluid circulation conduit connected to the fluid inlet side where the cleaning fluid is introduced into the storage tank at the other side, A third conduit valve V3 connected between the conduit valve V1 and the fluid circulation conduit connected to the fluid inlet side of the storage tank on the other side thereof and a third conduit valve V2 connected to the first conduit valve V1 and the third conduit V2, A second conduit valve V2 connected between the valve V3 and the fluid circulation conduit connected to the circulation pump on the other side thereof and a water line connecting unit connected to the inlet side of the heat exchanger on one side, A fifth conduit valve V5 positioned between the fluid circulation conduit connected to the fluid inlet side through which the washing liquid flows into the tank, a fifth conduit valve V5 positioned between the fifth conduit valve V5 connected to the inlet side of the heat exchanger on one side, year And a fourth conduit valve (V4) located between the circulation pump and the fluid circulation conduit connected to the circulation pump on the other side. The method according to claim 1,
Wherein the conduit valves are configured to change the flow direction of the cleaning liquid flowing through the switching of the conduit valves in forward or reverse directions when the cleaning liquid flowing into the fluid circulation conduit through the circulation pump is introduced into the heat exchanger. Chemical cleaning apparatus. delete (A) is connected to the inlet side and the outlet side of the water supply pipe or the steam pipe of the heat exchanger by using a hose shank coupler located at one side of the fluid circulation pipe, and all pipe valves (V1 to V5) maintaining the heat exchanger in a closed state to prepare for heat exchanger cleaning;
(B) preheating the mixed liquid containing the cleaning liquid stored in the storage tank to a defined temperature through a heater,
(C) controlling the conduit valves so that the fluid circulation of the mixed liquid stored in the storage tank can be forwardly circulated to the heat exchanger when the preheating of the mixed liquid is completed,
(D) controlling the conduit valves so that the fluid circulation of the mixed liquid stored in the storage tank may be reversely circulated to the heat exchanger after the forward cleaning time exceeds a predetermined time,
(E) a neutralization step of adding a neutralizing solution to the washed cleaning solution to purify the cleaning solution until the pH of the cleaning solution reaches pH 6.5 to 7.5, and
(F) separating the heat exchanger and the heat exchanger chemical cleaning apparatus from each other when the neutralization process is completed, opening the drain valve located at the lower end of the storage tank to discharge the mixed liquid in the storage tank,
(G) connecting the fluid inlet and the fluid outlet of the heat exchanger chemical cleaning apparatus using a hose shank coupler located at one side of the fluid circulation line after filling the storage tank with a cleaning liquid (water) And washing the inside of the heat exchanger chemical cleaning apparatus, the piping and the lake using the circulation of the cleaning liquid stored in the storage tank by operating the pump. 5. The method of claim 4, wherein step (B)
(B1) controlling the conduit valves so that the fluid circulation conduit is connected so that the mixed liquid containing the cleaning fluid stored in the storage tank is circulated only from the fluid outlet to the fluid inlet,
(B2) a step of raising the power supply of the heater and the circulation pump, and circulating the mixed liquid stored in the storage tank until the mixed liquid temperature rises to 70 ° C or more at room temperature (25 ° C) Way. 6. The method of claim 5, wherein step (B1)
The first and fourth pipe valves V1, V4 and V5 are maintained in a closed state while the second and third pipe valves V2 and V3 are kept open, ≪ / RTI > wherein the valves are controlled. 5. The method of claim 4, wherein step (C)
Stopping power supply to the circulation pump,
Controlling the conduit valves so that the fluid circulation of the mixed liquid stored in the storage tank can be forwardly circulated to the heat exchanger,
And performing a forward cleaning by raising the power of the circulation pump. 8. The method according to claim 4 or 7,
The control of the conduit valves which can be circulated in the forward direction allows the first conduit valve V1, the third conduit valve V3 and the fourth conduit valve V4 to be kept open, (V2, V5) are kept in a locked state. 5. The method of claim 4, wherein step (D)
Stopping power supply to the circulation pump,
Controlling the conduit valves so that the fluid circulation of the mixed liquor stored in the storage tank can be reversely circulated to the heat exchanger,
And performing a backward cleaning by raising the power of the circulation pump. 10. The method according to claim 4 or 9,
The control of the conduit valves that can be reversely circulated is performed by maintaining the first conduit valve V1, the second conduit valve V2 and the fifth conduit valve V5 open, (V3, V4) are kept in a locked state. 5. The method of claim 4,
Wherein the neutralizing liquid in step (E) can be added according to the concentration of the pH, and the circulation time can be changed. 5. The method of claim 4,
Wherein the step (F) comprises performing the forward cleaning and backward cleaning processes of the steps (C) and (D) through the control of the conduit valves to clean the interior of the heat exchanger chemical cleaning apparatus, the pipes and the lakes Chemical cleaning method.

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