KR20180099287A - Heat Exchanger Tube Cleaning System - Google Patents

Abstract

Disclosed is a heat exchanger tube cleaning system. One embodiment of the present invention provides the heat exchanger tube cleaning system for determining whether the inside of a heat exchanger has been squeezed with a plurality of balls when cleaning the inside of the heat exchanger. According to an aspect of the embodiment, the heat exchanger tube cleaning system comprises: a pump; a counter; and a determination unit.

Description

[0001] Heat Exchanger Tube Cleaning System [

This embodiment relates to a heat exchanger tube cleaning system. More particularly, to a heat exchanger tube cleaning system for circulating a plurality of balls to clean a duct, wherein the cleaning rate of the duct is determined.

The contents described below merely provide background information related to the present embodiment and do not constitute the prior art.

The heat exchanger tube, in which a fluid such as water flows, accumulates foreign matter or the like on the surface over time, thereby lowering heat exchange efficiency. To solve this problem, a large number of wash balls are charged and circulated, Scale removal techniques have been applied. A cleaning ball having elasticity is inserted into a heat exchanger facility through which cooling water flows, so that the cleaning balls are uniformly dispersed in the water chamber and flow into each tube, thereby cleaning the inner surface of the tube.

The performance of the condenser or heat exchanger can be ensured by maintaining the cleanliness of the tube of the heat exchanger and keeping the heat transfer rate of the tube constant, if the cleaning ball circulates well through the cleaning facility.

Therefore, it is necessary to judge to what extent the cleaning process of the heat exchanger facility using the cleaning ball has a cleaning rate.

Among the conventional cleaning systems, there is a method in which a transparent flow pipe is installed in the middle of the circulation path, a sensor is provided outside the flow pipe, and infrared rays are radiated to detect the balls flowing in the flow pipe to count the number of balls. In addition, since the time is not taken into consideration and only the counted number is used, it is insufficient to judge the cleaning rate of the tube. This conventional cleaning system is merely a method of automatically taking out a ball in the past and counting manually.

An object of the present invention is to provide a heat exchanger tube cleaning system capable of determining a more efficient cleaning rate by judging the degree of cleaning inside the heat exchanger as a new concept.

According to an aspect of the present embodiment, a heat exchanger tube cleaning system includes a cooling water tube of a heat exchanger, and includes a circulation path through which the fluid and the ball circulate, a pump installed on the circulation path and pumping the fluid, (T_B), a ball cycle circulation rate (R_C), a ball dispersion ratio (D_B), a ball circulation rate (R_B), a ball circulation rate And a ball cycle cleaning rate (C_C), and determines a cleaning rate of the cooling water tube.

The ball cycle circulation rate R_C or the ball dispersion ratio D_B is calculated using the average ball cluster cycle T_B.

The ball circle cycle (T_B1) for a single cycle of balls of n balls is defined by:

T_B1 = T_B1 '+ T_C = (L_R + nxd) / V_F + T_C

Then, the average ball circle cycle (T_B) for the N cycles of n balls is calculated by the following equation.

T_B = TIME (C_max) / N

Here, TIME (C_max) is defined as the time it takes for n ball clusters to cycle N times. L_R represents the total length of the circulation path, d represents the diameter of the ball, and V_F represents the flow rate of the fluid. T_C, on the other hand, represents the time during which the ball does not flow together with the flow velocity and stagnates during circulation.

The determination unit determines that the cooling water tube cleaning rate is good when the average ball cluster circulation period is equal to or greater than the first reference value.

The determination unit calculates the average ball cluster time (T_C) by the following equation and further determines the flow state of the fluid.

T_C = T_B - (L_R + nD) / V_F

The ball cycle circulation rate R_C calculates the average ball cycle circulation cycle T_B using the following equation.

R_C = T_B '/ T_B 100%

The judging unit judges that the cooling water tube cleaning rate is good when the ball cycle circulation rate is equal to or higher than the second reference value.

The ball dispersion ratio (D_B) for the N cycles of n balls is calculated by the following equation.

The determination unit determines that the cooling water tube cleaning rate is good when the ball dispersion ratio is equal to or greater than the third reference value.

The ball cycle cleaning rate is obtained by substituting the above-mentioned ball cycle circulation rate and the ball dispersion ratio into the following equation.

The judging unit judges that the cooling water tube cleaning rate is good when the ball cycle cleaning rate is the fourth reference value or more.

Further, the present invention further includes a ball collector connected to the circulation path and the branch flow channel, wherein the counter counts the ball while the ball is collected by the ball collector, and the determination unit determines the number of balls Calculate the recovery rate.

The ball recovery rate is obtained using the following equation.

R_B = B_r / n x 100%

In the case of judging the cooling water tube cleaning rate, the system may be set on the condition that the ball recovery rate is equal to or higher than the fifth reference value.

The present invention can provide a new criterion that can more effectively determine the degree of pipeline washing when using a device for cleaning a pipeline using a cleaning ball.

1 is a schematic view illustrating a heat exchanger tube cleaning system according to an embodiment of the present invention.
2 is a block diagram schematically illustrating a determination unit according to an embodiment of the present invention.
3 is a flowchart schematically showing the operation of the determination unit of the heat exchanger tube cleaning system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. Throughout the specification, when an element is referred to as being "comprising" or "comprising", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise . In addition, '... Quot ;, " module ", and " module " refer to a unit that processes at least one function or operation, and may be implemented by hardware or software or a combination of hardware and software.

1 is a schematic view showing a heat exchanger tube cleaning system 100 according to an embodiment of the present invention.

A heat exchanger tube cleaning system 100 according to the present invention includes a circulation path 10, a pump 80, a counter 20, and a determination unit 30.

The circulation path 10 includes a cooling water tube 12 of a heat exchanger 40, and the fluid and the ball circulate. Here, the circulation path 10 includes an inlet pipe 11, a cooling water tube 12, an outlet pipe 13, and first conduits 14 and 15.

The pump 80 is installed on the circulation path 10 and pumps the fluid to circulate.

The counter 20 is connected to one end of the circulation path 10 to count the time and the number of balls.

The determination unit 30 calculates the ball cycle ratio R_B, the average ball cluster cycle T_B, the ball cycle circulation ratio R_C, the ball dispersion ratio D_B, (C_C) and determines the cleaning rate of the cooling water tube (12).

Here, the determination unit 30 calculates the ball recovery rate R_B, the average ball cluster rotation cycle T_B, the ball cycle rotation rate R_C, the ball dispersion ratio D_B, and the ball cycle cleaning rate C_C, .

1, the heat exchanger tube cleaning system 100 includes an air compressor 50 for producing high pressure compressed air, a high pressure compressor (not shown) for receiving the fluid and leading from the air compressor 50 An injector 51 for injecting air into the heat exchanger 40 and a plurality of balls 60 for receiving the air and discharging the fluid 60 from the injector 51 to the heat exchanger 40, A ball collector 52 connected to the circulation path 10 and the branch passage 57 for discharging the ball 60 to the side of the ball 40 and a ball 60 discharged from the ball collector 52 and passing through the heat exchanger 40 And a ball strainer (21) for returning to the ball collector (52) side.

A first solenoid valve 54 is provided in the second conduit 53 connecting the air compressor 50 and the injector 51 and the ball collector 52 is connected to the inlet pipe 11 of the heat exchanger 40 A first check valve 22 is installed in the first conduit 70 and a second check valve 23 is installed in the first conduit 14 connecting the ball collector 52.

The counter 20 may be installed in the first conduit 14 connecting between the outlet side of the ball strainer 21 and the inlet side of the second check valve 23.

The counter (20) counts the ball passing the counter (20). Ball counting can be done while the ball is circulating for heat exchange tube cleaning. The ball counting may also be performed while collecting the ball 60 with the ball collector 52.

The counter may be a device that performs counting by sensing that the ball is passed between the light emitting part and the light receiving part to block light from the light emitting part to the light receiving part. Such a counter can be a conventionally known apparatus and its detailed description will be omitted.

The injector 51 is provided with a drain pipe 55 for discharging the high pressure compressed air in the injector 51 to the outside and a second solenoid valve 56 is installed in the middle of the drain pipe 55.

The control unit 70 controls the opening and closing timing of the first and second solenoid valves 54 and 56 so that the heat exchanger tube cleaning system 100 can be smoothly operated.

The operation of the heat exchanger tube cleaning system 100 will now be described. In the initial state in which both the first and second solenoid valves 54 and 56 are closed and the plurality of balls 60 are gathered in the ball collector 52 and the fluid is filled in the injector 51, When the air compressor 50 is operated and the first solenoid valve 54 is opened, high pressure air flows into the injector 51 from the compressor 50 to pressurize the fluid. This pressing force is transmitted into the ball collector 52 so that a plurality of balls 60 in the ball collector 52 are introduced into the inlet of the heat exchanger 40 through the first check valve 22 and the first conduit 15 .

The control unit 70 switches the first solenoid valve 54 to the closed state when a predetermined time has elapsed before the ball 60 can be fully introduced into the heat exchanger 40 from the ball collector 52. [ The plurality of balls 60 introduced into the heat exchanger 40 are in close contact with the inner wall surface of the channel of the heat exchanger 40 and pass through the channel to remove the scale fixed to the wall surface.

The fluid that has passed through the heat exchanger 40 passes through the outflow pipe 13 and is discharged to the outside while passing through the ball strainer 21. The ball 60 passes through the ball strainer 21, Through the second check valve 23 and the first check valve 22 to the heat exchanger 40 again.

When the cleaning is completed, the control unit 70 closes the second check valve 23, and the ball 60 passes through the first conduit 14 and waits in a stationary state at the inlet of the second check valve 23. The control unit 70 opens the second solenoid valve 54 so that the high pressure air in the injector 51 is supplied to the drain pipe 55 ) To the outside. At the same time, the ball 60 is returned to the ball collector 52 via the second check valve 23, and the fluid passes through the ball collector 52 to refill the inside of the injector 51. The control unit 70 closes the second solenoid valve 56 so that the heat exchanger tube cleaning system 100 is returned to the initial state .

2 is a block diagram schematically showing a determination unit 30 according to an embodiment of the present invention.

The determination unit 30 includes an average ball circle cycle determining unit 31, a ball cycle net exchange rate determining unit 32, a ball dispersion ratio determining unit 33, a ball cycle cleaning rate determining unit 34, 35).

The average ball cluster cycle determiner 31 determines the ball cycle cycle rate. The ball cycle circulation rate (R_C) or the ball dispersion ratio (D_B) is calculated using the ball cluster cycle (T_B).

Here, the ball cluster circulation period (T_B) for one circulation of n balls is defined by the following equation (1).

T_B1 = T_B1 '+ T_C = (L_R + nxd)) / V_F + T_C (1)

T_B1 is the one cycle cycle of n balls, T_B1 'is the cycle cycle of the theoretical ball cycle, T_C: The ball does not flow together with the flow rate, and T_B1 is the sum of T_B1 and T_C. , The length of the circulation path, n: the number of balls, d: the diameter of the ball, V_F: the speed of the fluid, where the theoretical rolling cycle T_B1 ' n is the ideal total circulation length through a point in the circulation path divided by the velocity of the fluid.)

Here, the average ball cluster circulation period (T_B) for the N-times circulation of n balls is calculated by the following equation (2).

T_B = TIME (C_max) / N (2)

(T_B) is obtained by dividing TIME (C_max) by N. T_B: Average ball climatic cycle for N cycles of n ball clusters, TIME (C_max): N ball clusters circulating N times , And N: the number of times the ball is circulated.)

The average ball cluster circulation period determination unit 31 determines that the cooling water tube cleaning rate is good when the average ball cluster circulation period is equal to or greater than the first reference value.

In addition, the average ball cluster cycle determining unit 31 calculates the average ball cluster time T_C using the following equation (3) and further determines the flow state of the fluid. The average ball cluster cycle determining unit 31 determines that the flow condition of the fluid is better as the ball cluster hold time T_C is shorter and accordingly determines that circulation is good when the flow condition of the fluid is good, It is judged that the cleaning rate is good.

T_C = T_B - (L_R + nxd) / V_F Equation (3)

Where T_C is the ball cluster congestion time, T_B is the average ball cluster cycle for the N cycles of n balls, L_R is the length of the circulation path, n is the number of balls, d is the diameter of the ball, Speed.)

The ball cycle circulation rate determination unit 32 obtains the ball cycle circulation rate R_C by substituting the ball circulation cycle T_B into the following equation (4).

R_C = T_B '/ T_B x 100% (4)

(Where R_C is obtained by multiplying T_B 'by T_B multiplied by 100%) R_C: Ball cycle circulation rate, T_B: Average ball population cycle for N cycles of n crowds of balls Cycle, T_B ': theoretical cycle of cycles.)

The ball cycle circulation rate determination unit 32 determines that the cooling water tube cleaning rate is good when the ball cycle circulation rate is equal to or greater than the second reference value. Here, the second reference value may be, for example, 60% or more.

The ball dispersion ratio determiner 33 calculates the ball dispersion ratio D_B for N cycles of n ball clusters using the following equation (5).

... [수학식 5]

... " (5) "

,

이고, D_BN : n개 볼 무리의 N회 순환에 대한 볼 분산율, T_B : n개 볼 무리의 N회 순환에 대한 평균 볼 무리 순환 주기, T_BN : N회 순환하는 볼 무리 순환 주기, i : 볼이 튜브를 통과한 횟수, mi : 볼이 i회 이상 통과한 튜브 수, n : 볼 전체 개수, mo : 볼이 한번도 통과하지 않은 튜브 수이다.)(Where constraint:

,

D_BN: Ball dispersal ratio for N circles of n balls, T_B: Average ball crowd cycle for N circles of n ball crowns, T_BN: Ball crowd cycle circulating N times, i: Mi: the number of tubes that have passed the ball more than i times, n: the total number of balls, mo: the number of tubes that the ball has never passed through.)

When the ball dispersion ratio is high, the ball dispersion ratio determiner 33 determines that the ball is uniformly dispersed and uniformly passed through the plurality of tubes before flowing into the tube.

The ball dispersion ratio determiner 33 determines that the cooling water tube cleaning rate is good when the ball dispersion ratio is equal to or greater than the third reference value. Here, the third reference value may be, for example, 60% or more.

The ball cycle cleaning rate determination unit 34 obtains the ball cycle cleaning rate C_C by substituting the ball cycle rotation rate and the ball dispersion ratio into the following equation (6).

... [수학식 6]

... " (6) "

(Where C_C is the cycle cleaning rate, R_C is the circulation rate of the ball, and D_B is the ball dispersion ratio).

The ball cycle cleaning rate determination unit 34 determines that the cooling water tube cleaning rate is good when the ball cycle cleaning rate is equal to or greater than the fourth reference value. Here, the fourth reference value may be, for example, 60% or more.

The ball recovery rate determination unit 35 calculates the ball recovery rate using the number of balls counted. The ball recovery rate determination unit 35 is obtained using the following equation (7).

R_B = B_r / nx100% (7)

(Where R_B is the ball recovery rate, n is the total number of ball inputs, and B_r is the number of balls recovered during the set time, which is the collection operation time relative to n total ball inputs).

The ball recovery rate is calculated as the ball recovery rate during the set time, and the set time may be, for example, 30 minutes.

The ball recovery rate determining unit 35 assumes that the ball recovery rate is equal to or greater than the fifth reference value when the cooling water tube cleaning rate is determined. Here, the fifth reference value may be, for example, 95% or more on a 30-minute basis.

3 is a flowchart schematically showing the operation of the determination unit of the heat exchanger tube cleaning system according to an embodiment of the present invention.

The determination unit 30 calculates the ball recovery rate using the counted number of balls (S301). Here, the ball recovery rate represents the ratio of balls recovered during the set time, which is the collection operation time versus the total ball input n.

The determination unit 30 determines whether the ball recovery rate is equal to or greater than a fifth reference value (S302). Here, the fifth reference value is, for example, 95% for 30 minutes.

If it is determined in step S302 that the ball recovery rate is equal to or greater than the fifth reference value, the determination unit 30 calculates an average ball climatic cycle (S303). Here, the average ball circulation cycle is a value obtained by dividing the time required for circulation of n balls by N balls divided by the number of circulation times of balls.

If it is determined in step S302 that the ball recovery rate is less than the fifth reference value, the determination of the cooling water tube cleaning rate is terminated.

The determination unit 30 calculates an average ball clump time using the average ball clump cycle (S304). Here, the average ball clump time is the average ball clump cycle for the N cycles of n ball clumps minus the theoretical ball clump cycles of n balls.

The determination unit 30 calculates the ball cycle circulation rate using the average ball circulation cycle (S305). Here, the ball cycle circulation rate represents the ratio of the theoretical circulation cycle to the actual circulation cycle.

The determination unit 30 calculates the ball dispersion ratio using the average ball cluster cycle (S306). Here, the ball dispersion ratio is the number of tubes that have passed the ball more than i times during the ball climatic cycle N times compared to the total ball input n times.

The determination unit 30 calculates the ball cycle cleaning rate using the ball cycle net rotation rate and the ball dispersion ratio (S307).

The determination unit 30 determines whether the average ball circle cycle, the ball circle rotation rate, the ball dispersion ratio, and the ball cycle cleaning rate are respectively equal to or greater than a first reference value, a second reference value, a third reference value, and a fourth reference value, , It is determined that the fluid flow condition is good and the fluid flow condition is good, so that it is determined that circulation is good if the fluid flow condition is good (S308).

Although it is described in FIG. 3 that steps S301 to S308 are sequentially executed, it is only described by way of example of the technical idea of the present embodiment. As long as those skilled in the art are familiar with the present invention, It is to be understood that various changes and modifications may be made to the invention without departing from the essential characteristics thereof, or alternatively, by executing one or more of steps S301 to S308 in parallel, But is not limited thereto.

It is to be understood that the above description is only illustrative of the technical idea of the present embodiment and that various modifications and changes may be made by those skilled in the art without departing from the essential characteristics of the embodiments . Therefore, the present embodiments are to be construed as illustrative rather than limiting, and the scope of the technical idea of the present embodiment is not limited by these embodiments. It is to be understood that the scope of the present invention is to be construed as being limited only by the scope of the appended claims.

100: Heat exchanger tube cleaning system
10:
11: Inflow pipe
12: cooling water tube
13: Outflow pipe
14, 15: first channel
20: Counter
21: Ball strainer
22: first check valve
23: second check valve
30:
31: average ball cluster cycle judgment unit
32: Ball cycle circulation rate judgment unit
33: Ball dispersion ratio determining unit
34: Ball cycle cleaning rate determination unit
35: Ball recovery rate determination unit
40: heat exchanger
50: Compressor
51: injector
53: Ball collector
54: first solenoid valve
55: drain pipe
56: Second solenoid valve
57: Branching Euro
60: view
70:
80: Pump

Claims (15)

A circulation path including a cooling water tube of a heat exchanger, in which the fluid and the ball circulate;
A pump installed on the circulation path for pumping the fluid;
A counter coupled to the circulation path at one end for counting the time and the number of balls; And
At least one of the ball recovery rate R_B, the average ball population cycle T_B, the ball cycle circulation rate R_C, the ball dispersion ratio D_B, and the ball cycle cleaning rate C_C is calculated using the counting result of the counter And determining a cleaning rate of the cooling water tube
And a heat exchanger tube cleaning system. The method according to claim 1,
Wherein the ball cycle recirculation rate R_C or the ball dispersion ratio D_B is calculated using the average ball population cycle T_B. 3. The method of claim 2,
The ball circle cycle (T_B1) for one cycle of n balls is given by the following equation
T_B1 = T_B1 '+ T_C = (L_R + nxd) / V_F + T_C
(T_B1: 1 cycle cycle of n balls, T_B1 ': 1 cycle cycle of theoretical balls, T_C: Time the ball stays in the circulation loop, L_R: Length of the circulation path, n: Number of balls, d: Diameter, V_F: Fluid velocity.)
≪ / RTI > The method of claim 3,
The average ball herding cycle (T_B) for the N cycles of n balls is given by the following equation
T_B = TIME (C_max) / N
(T_B: average ball climatic cycle for N cycles of n ball clusters, TIME (C_max): defined as the time it takes for n ball clusters to cycle N times, N: number of cycles of ball clusters)
Is calculated as < RTI ID = 0.0 >
TIME (C_max) is defined as the time it takes for n balls to circulate N times. 5. The method of claim 4,
Wherein the determination unit determines that the cooling water tube cleaning rate is good when the average ball cluster circulation period is equal to or greater than a first reference value. 6. The method of claim 5,
The determination unit may determine the average ball cluster time (T_C)
T_C = T_B - (L_R + nD) / V_F
(T_C: ball cluster congestion time, T_B: average ball cluster circulation cycle for n circulation of n balls, L_R: length of circulation path, n: number of balls, d: diameter of ball, V_F: speed of fluid)
And further determines the flow state of the fluid. 3. The method of claim 2,
The ball cycle recirculation cycle (T_B) is calculated by the following equation
R_C = T_B '/ T_B 100%
(R_C: ball cycle circulation rate, T_B: average ball cycle circulation cycle (actual ball cycle circulation cycle) for N cycle circulation of n balls, T_B ': theoretical ball cycle circulation cycle)
In the heat exchanger tube cleaning system. 8. The method of claim 7,
Wherein the determination unit determines that the cooling water tube cleaning rate is good when the ball cycle circulation rate is equal to or greater than a second reference value. 3. The method of claim 2,
The ball dispersion ratio (D_B) for N cycles of n balls is calculated by the following equation

(Constraint:

,

D_BN: Ball dispersal ratio for N circles of n balls, T_B: Average ball crowd cycle for N circles of n ball crowns, T_BN: Ball crowd cycle circulating N times, i: Mi: number of tubes that have passed the ball more than i times, n: total number of balls, mo: number of tubes that have never passed the ball)
Of the heat exchanger tube cleaning system. 10. The method of claim 9,
Wherein the determination unit determines that the cooling water tube cleaning rate is good when the ball dispersion ratio is equal to or greater than a third reference value. 10. The method of claim 7,
The ball cycle cleaning rate is calculated by dividing the ball cycle circulation rate and the ball dispersion ratio by the following equation

(C_C: ball cycle cleaning rate, R_C: ball cycle circulation rate, D_B: ball dispersion ratio)
In the heat exchanger tube cleaning system. 12. The method of claim 11,
Wherein the controller determines that the cooling water tube cleaning rate is good when the ball cycle cleaning rate is equal to or greater than a fourth reference value. The method according to claim 1,
And a ball collector connected to the circulation path and the branch flow path,
The counter counts the ball while the ball is being collected by the ball collector,
Wherein the determination unit calculates the ball recovery rate using the number of balls counted. 14. The method of claim 13,
The ball recovery rate is calculated by the following equation
R_B = B_r / n x 100%
(R_B: ball recovery rate, n: total ball input count, B_r: number of balls recovered for 30 minutes,
Of the heat exchanger tube cleaning system. 15. The method of claim 14,
Wherein when the cooling water tube cleaning rate is judged, the case where the ball recovery rate is equal to or greater than a fifth reference value is assumed as a prerequisite condition.

Images