A high-temperature tubular heat exchanger and its cleaning method

Abstract

A cleaning method for a high-temperature tubular heat exchanger. By setting up structures such as a one-way valve and a straight-tube heat exchanger body that cooperate with each other, the one-way valve is connected to an external high-pressure water supply end, so that the high-pressure cleaning liquid is pumped into the straight-tube heat exchanger body through a high-pressure spray head. At this time, the heat exchange straight copper tubes in the straight-tube heat exchanger body are evenly sprayed with the high-pressure cleaning liquid. Since a number of groups of high-pressure spray heads and one-way valves are installed on the outer peripheral surface of the straight-tube heat exchanger body at equal intervals and equal angles, it can be ensured that a number of groups of heat exchange straight copper tubes in the straight-tube heat exchanger body are evenly sprayed. During the spraying process, the straight-tube heat exchanger body reciprocates and rotates forward and backward through a rotary drive assembly and a motor controller, helping the cleaning liquid to continuously flow and impact on a number of groups of heat exchange straight copper tubes, thereby further flushing the dirt on the heat exchange straight copper tubes. The present invention is used for cleaning high-temperature tubular heat exchangers.

Description

Technical Field

[0001] The invention relates to a high-temperature tubular heat exchanger used in a thermal power plant, in particular to a high-temperature tubular heat exchanger and a cleaning method thereof. Background Art

[0002] The high-temperature tubular heat exchanger is mainly composed of a shell, a tube bundle, a tube sheet and a head. The shell is mostly circular, with parallel tube bundles installed inside. Both ends of the tube bundle are fixed on the tube sheet. One working fluid enters the heat transfer tube from the inlet pipe at the head end, and its flow can be realized in a one-pass, two-pass and four-pass structure according to the process requirements; another working fluid enters the shell from the inlet pipe at one end of the shell and is evenly distributed outside the heat transfer tube. Its flow state can be set in different types and quantities of baffles in the tube bundle according to the process requirements, and heat exchange is carried out by medium convection. For example, a high-temperature tubular heat exchanger disclosed in the authorization announcement number CN216205496U includes a heat exchanger main The heat exchanger comprises a body, a hydraulic cylinder, a support plate and a knocking mechanism. The hydraulic cylinder is used to lift the heat exchanger to tilt the heat exchanger, and then the knocking mechanism is used to knock the heat exchanger shell, so that the scale inside the heat exchanger shell flows out along the inclined inner wall of the heat exchanger under the knocking. There is no need to disassemble the heat exchanger shell, which saves time and effort and is convenient for cleaning and use. However, in the process of knocking the heat exchanger shell with the knocking mechanism, the heat exchange copper tube gradually away from the knocking mechanism loses its vibration force, that is, its own vibration is difficult to shake off the dirt on the tube body, and the effect of cleaning the scale is poor. In addition, the high-frequency vibration is also easy to cause the internal copper tube and baffle to become loose, thereby reducing the working stability of the heat exchanger. Summary of the invention

[0003] The purpose of the present invention is to provide a high-temperature tubular heat exchanger machine cleaning method to solve the problem in the above background technology that the effect of using a knocking mechanism to shake dirt in the heat exchanger is poor and it is difficult to effectively clean the copper tubes inside the heat exchanger.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A method for cleaning a high-temperature tubular heat exchanger comprises the following steps: providing a one-way valve and a straight-tube heat exchanger body and other structures that cooperate with each other, connecting the one-way valve to an external high-pressure water supply end, so that a high-pressure cleaning liquid is pumped into the straight-tube heat exchanger body through a high-pressure nozzle pump, and at this time, the high-pressure cleaning liquid is used to spray the heat-exchanging straight copper tubes in the straight-tube heat exchanger body evenly. Since a plurality of groups of high-pressure nozzles and one-way valves are installed on the outer peripheral surface of the straight-tube heat exchanger body at equal intervals and angles, it is ensured that a plurality of groups of heat-exchanging straight copper tubes in the straight-tube heat exchanger body are sprayed evenly. During the spraying process, the straight-tube heat exchanger body is rotated back and forth by a rotating drive assembly and a motor controller, which helps the cleaning liquid to continuously flow and impact on a plurality of groups of heat-exchanging straight copper tubes, thereby further flushing down the dirt on the heat-exchanging straight copper tubes.

[0006] A cleaning method for a high-temperature tubular heat exchanger. First, the high-temperature medium enters the tube (602) through the second medium, and the front head (601) is introduced into a number of heat exchange straight copper tubes (13). The low-temperature medium enters the straight-tube heat exchanger main body (6) through the first medium inlet tube (10). At this time, the high-temperature medium and the low-temperature medium flow in opposite directions. After heat exchange, the temperature of the high-temperature medium decreases and enters the rear head (603), and is finally discharged through the second medium discharge tube (604), thus completing the heat exchange work of the medium. The heated low-temperature medium is discharged through the first medium discharge tube (11).

[0007] When it is necessary to clean the heat exchange straight copper tubes (13) in the straight-tube heat exchanger main body (6), the one-way valve (8) is connected to an external high-pressure water supply end, so that the high-pressure cleaning liquid is pumped into the straight-tube heat exchanger main body (6) through the high-pressure nozzle (7). At this time, the heat exchange straight copper tubes (13) in the straight-tube heat exchanger main body (6) are evenly sprayed with the high-pressure cleaning liquid. Since a number of high-pressure nozzles (7) and one-way valves (8) are installed on the outer peripheral surface of the straight-tube heat exchanger main body (6) at equal intervals and equal angles, it can be ensured that a number of heat exchange straight copper tubes (13) in the straight-tube heat exchanger main body (6) are evenly sprayed. During the spraying process, the staff turns on the three-phase asynchronous motor (4) through the motor controller (104), so that the three-phase asynchronous motor (4) reciprocates and rotates intermittently in the positive and negative directions. Then, the three-phase asynchronous motor (4) drives the inner ring (3) and the straight-tube heat exchanger main body (6) to reciprocate and rotate in the positive and negative directions through the belt drive structure (5), so that the cleaning liquid continuously flows and impacts on a number of heat exchange straight copper tubes (13), thereby further flushing the dirt on the heat exchange straight copper tubes (13). The flushed sewage is discharged through the first medium discharge tube (11) or the sewage discharge tube (9). Compared with the previous knocking cleaning method, this equipment ensures that the copper tubes are evenly sprayed, so that the dirt is fully flushed down, and the copper tubes and plate parts will not be damaged.

[0008] The described high-temperature tubular heat exchanger includes a frame (1). Vertical plates (2) are fixed on the inner walls of both sides of the frame (1). Inner rings (3) are rotatably installed in both groups of vertical plates (2). A straight-tube heat exchanger body (6) is installed through between the two inner rings (3). A number of groups of high-pressure nozzles (7) with equal spacing and equal angles are installed on the outer wall of the straight-tube heat exchanger body (6). A check valve (8) is installed at the top of the high-pressure nozzle (7). The check valve (8) is connected to an external high-pressure water supply end. A rotary drive assembly for driving the inner ring (3) to rotate is installed on the outer wall of one side of the frame (1). A support table (101) is fixed at one end inside the frame (1). A number of groups of rotary support structures for assisting the straight-tube heat exchanger body (6) to rotate are installed at the top of the support table (101). A motor controller (104) is installed on one side at the bottom of the support table (101). The output end of the motor controller (104) is electrically connected to the input end of the rotary drive assembly.

[0009] In the described high-temperature tubular heat exchanger, a front head (601) and a rear head (603) are respectively installed at both ends of the straight-tube heat exchanger body (6). A second medium inlet pipe (602) and a second medium outlet pipe (604) are respectively installed at the ends of the front head (601) and the rear head (603) far from the straight-tube heat exchanger body (6).

[0010] In the described high-temperature tubular heat exchanger, a front tube bundle plate (12) and a rear tube bundle plate (14) are respectively fixed on the inner walls of both sides of the straight-tube heat exchanger body (6). A number of groups of heat exchange straight copper tubes (13) with equal spacing are fixed between the front tube bundle plate (12) and the rear tube bundle plate (14). A first medium inlet pipe (10) is installed on one side at the top of the straight-tube heat exchanger body (6). A first medium outlet pipe (11) and a blowdown pipe (9) are respectively installed on both sides at the bottom of the straight-tube heat exchanger body (6).

[0011] 6. The high-temperature tubular heat exchanger according to claim 5, wherein: the rotary support structure is two bearing seats (102) fixed at the top of the support table (101). An auxiliary wheel (103) is rotatably installed between adjacent two bearing seats (102). The top of the auxiliary wheel (103) is in contact with the outer peripheral surface of the straight-tube heat exchanger body (6).

[0012] In the described high-temperature tubular heat exchanger, the rotary drive assembly is a three-phase asynchronous motor (4) installed on the outer wall of one side of the frame (1). The output end of the three-phase asynchronous motor (4) drives the inner ring (3) to rotate through a belt drive structure (5).

[0013] In the described high-temperature tubular heat exchanger, switching valves are installed at the ends of the first medium inlet pipe (10), the first medium outlet pipe (11), and the blowdown pipe (9).

[0014] In the described high-temperature tubular heat exchanger, the belt drive structure (5) includes a driving pulley installed at the output end of the three-phase asynchronous motor (4) and a driven pulley installed on the surface of the inner ring (3), and the driven pulley and the driving pulley are connected to each other through a crawler.

[0015] Advantages of the present invention:

[0016] In the high-temperature tubular heat exchanger, through the mutually cooperating structures such as a check valve and a straight-tube heat exchanger main body, the check valve is connected to an external high-pressure water supply end, so that high-pressure cleaning liquid is pumped into the straight-tube heat exchanger main body through a high-pressure spray head. At this time, the heat exchange straight copper tubes in the straight-tube heat exchanger main body are evenly sprayed with the high-pressure cleaning liquid. Since a number of groups of high-pressure spray heads and check valves are installed on the outer peripheral surface of the straight-tube heat exchanger main body at equal intervals and equal angles, it can be ensured that a number of groups of heat exchange straight copper tubes in the straight-tube heat exchanger main body are evenly sprayed. During the spraying process, through the rotation drive assembly and the motor controller, the straight-tube heat exchanger main body reciprocates in positive and negative rotations, helping the cleaning liquid to continuously flow and impact on a number of groups of heat exchange straight copper tubes, thereby further flushing the dirt on the heat exchange straight copper tubes. Compared with the conventional knocking cleaning method, this device ensures that the copper tubes are evenly sprayed, so that the dirt is fully flushed down, and the copper tubes and plate parts will not be damaged.

[0017] The present invention uses high-pressure cleaning liquid to evenly spray the heat exchange straight copper tubes in the straight-tube heat exchanger main body, ensuring that a number of groups of heat exchange straight copper tubes in the straight-tube heat exchanger main body are evenly sprayed. During the spraying process, it helps the cleaning liquid to continuously flow and impact on a number of groups of heat exchange straight copper tubes. Compared with the conventional knocking cleaning method, this device ensures that the copper tubes are evenly sprayed, so that the dirt is fully flushed down, and the copper tubes and plate parts will not be damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the front view structural schematic diagram of the present invention;

[0019] Figure 2 It is the front view sectional structural schematic diagram of the straight-tube heat exchanger main body of the present invention;

[0020] Figure 3 It is the side view structural schematic diagram of the present invention;

[0021] Figure 4 For the present invention Figure 2 The enlarged structural schematic diagram at A in;

[0022] In the figure: 1, frame; 101, support platform; 102, bearing seat; 103, auxiliary wheel; 104, motor controller; 2, vertical plate; 3, inner ring; 4, three-phase asynchronous motor; 5, belt drive structure; 6, straight-tube heat exchanger body; 601, front head; 602, second medium inlet pipe; 603, rear head; 604, second medium discharge pipe; 7, high-pressure nozzle; 8, check valve; 9, sewage pipe; 10, first medium inlet pipe; 11, first medium discharge pipe; 12, front tube bundle plate; 13, heat exchange straight copper tube; 14, rear tube bundle plate. Specific implementation manner

[0023] Please refer to Figures 1-4 , an embodiment provided by the present invention: a high-temperature tube heat exchanger, including a frame 1, vertical plates 2 are fixedly arranged on both inner walls of the frame 1, an inner ring 3 is rotatably installed in each of the two groups of vertical plates 2, a straight-tube heat exchanger body 6 is installed through between the two groups of inner rings 3, front heads 601 and rear heads 603 are respectively installed at both ends of the straight-tube heat exchanger body 6, and a second medium inlet pipe 602 and a second medium discharge pipe 604 are respectively installed at one ends of the front head 601 and the rear head 603 away from the straight-tube heat exchanger body 6, and a high-temperature medium is introduced into a plurality of heat exchange straight copper tubes 13 through the second medium inlet pipe 602 and the front head 601;

[0024] Front tube bundle plates 12 and rear tube bundle plates 14 are respectively fixedly arranged on both inner walls of the straight-tube heat exchanger body 6, a plurality of groups of heat exchange straight copper tubes 13 are fixedly arranged at equal intervals between the front tube bundle plates 12 and the rear tube bundle plates 14, and the front tube bundle plates 12 and the rear tube bundle plates 14 play a role in sealing the low-temperature medium;

[0025] A first medium inlet pipe 10 is installed on one side of the top end of the straight-tube heat exchanger body 6, a first medium discharge pipe 11 and a sewage pipe 9 are respectively installed on both sides of the bottom end of the straight-tube heat exchanger body 6, and on-off valves are installed at the ends of the first medium inlet pipe 10, the first medium discharge pipe 11 and the sewage pipe 9, and a low-temperature medium enters the straight-tube heat exchanger body 6 through the first medium inlet pipe 10;

[0026] The high-temperature medium and the low-temperature medium flow in opposite directions. After heat exchange, the temperature of the high-temperature medium decreases and enters the rear head 603, and is finally discharged through the second medium discharge pipe 604, thereby completing the heat exchange work of the medium, and the heated low-temperature medium is discharged through the first medium discharge pipe 11;

[0027] On the outer wall of the main body 6 of the straight-tube heat exchanger, several groups of high-pressure nozzles 7 are installed at equal distances and equal angles, and a one-way valve 8 is installed at the top of the high-pressure nozzle 7. The one-way valve 8 is connected to the external high-pressure water supply end. When it is necessary to clean the heat exchange straight copper tubes 13 in the main body 6 of the straight-tube heat exchanger, the staff connects the one-way valve 8 to the external high-pressure water supply end, so that the high-pressure cleaning liquid is pumped into the main body 6 of the straight-tube heat exchanger through the high-pressure nozzle 7. At this time, the heat exchange straight copper tubes 13 in the main body 6 of the straight-tube heat exchanger are evenly sprayed with the high-pressure cleaning liquid;

[0028] A rotation drive assembly for driving the inner ring 3 to rotate is installed on the outer wall of one side of the frame 1. One end inside the frame 1 is fixed with a support table 101. Several groups of swing support structures for assisting the main body 6 of the straight-tube heat exchanger to rotate are installed on the top of the support table 101. One side of the bottom end of the support table 101 is installed with a motor controller 104. The output end of the motor controller 104 is electrically connected to the input end of the rotation drive assembly. During the spraying process, the staff turns on the three-phase asynchronous motor 4 through the motor controller 104, so that the three-phase asynchronous motor 4 reciprocates and rotates intermittently in both forward and reverse directions;

[0029] The rotation drive assembly is a three-phase asynchronous motor 4 installed on the outer wall of one side of the frame 1. The output end of the three-phase asynchronous motor 4 drives the inner ring 3 to rotate through a belt drive structure 5. The belt drive structure 5 includes a driving wheel installed at the output end of the three-phase asynchronous motor 4 and a driven wheel installed on the surface of the inner ring 3. The driven wheel and the driving wheel are connected to each other through a crawler;

[0030] The three-phase asynchronous motor 4 drives the inner ring 3 and the main body 6 of the straight-tube heat exchanger to rotate reciprocally in both forward and reverse directions through the belt drive structure 5, so that the cleaning liquid continuously flows and impacts on several groups of heat exchange straight copper tubes 13, thereby further flushing the dirt on the heat exchange straight copper tubes 13. The flushed sewage is discharged through the first medium discharge pipe 11 or the sewage discharge pipe 9;

[0031] The swing support structure is two bearing seats 102 fixed on the top of the support table 101. An auxiliary wheel 103 is rotatably installed between two adjacent bearing seats 102. The top of the auxiliary wheel 103 is in contact with the outer peripheral surface of the main body 6 of the straight-tube heat exchanger. During the rotation of the main body 6 of the straight-tube heat exchanger, the bearing seats 102 and the auxiliary wheel 103 are used to improve the rotation stability of the main body 6 of the straight-tube heat exchanger.

Claims

1. A cleaning method for a high-temperature tubular heat exchanger, characterized in that: By means of a structure in which a check valve and a straight-tube heat exchanger body cooperate with each other, the check valve is connected to an external high-pressure water supply end, so that high-pressure cleaning liquid is pumped into the straight-tube heat exchanger body through a high-pressure spray head. At this time, the heat exchange straight copper tubes in the straight-tube heat exchanger body are evenly sprayed with the high-pressure cleaning liquid. Since a number of groups of high-pressure spray heads and check valves are installed on the outer peripheral surface of the straight-tube heat exchanger body at equal intervals and equal angles, it is ensured that a number of groups of heat exchange straight copper tubes in the straight-tube heat exchanger body are evenly sprayed. During the spraying process, the straight-tube heat exchanger body reciprocates and rotates in both forward and reverse directions through a rotation drive assembly and a motor controller, helping the cleaning liquid to continuously flow and impact on a number of groups of heat exchange straight copper tubes, thereby further flushing the dirt on the heat exchange straight copper tubes.

2. The cleaning method of a high-temperature tubular heat exchanger according to claim 1, characterized in that: First, a high-temperature medium enters a number of groups of heat exchange straight copper tubes (13) through a second medium inlet pipe (602) and a front head (601), and a low-temperature medium enters the straight-tube heat exchanger body (6) through a first medium inlet pipe (10). At this time, the high-temperature medium and the low-temperature medium flow in opposite directions. After heat exchange, the temperature of the high-temperature medium decreases and enters the rear head (603), and is finally discharged through a second medium discharge pipe (604), thereby completing the heat exchange work of the medium. The low-temperature medium after temperature rise is discharged through a first medium discharge pipe (11). When it is necessary to clean the heat exchange straight copper tubes (13) in the straight-tube heat exchanger body (6), the check valve (8) is connected to an external high-pressure water supply end, so that high-pressure cleaning liquid is pumped into the straight-tube heat exchanger body (6) through the high-pressure spray head (7). At this time, the heat exchange straight copper tubes (13) in the straight-tube heat exchanger body (6) are evenly sprayed with the high-pressure cleaning liquid. Since a number of groups of high-pressure spray heads (7) and check valves (8) are installed on the outer peripheral surface of the straight-tube heat exchanger body (6) at equal intervals and equal angles, it is ensured that a number of groups of heat exchange straight copper tubes (13) in the straight-tube heat exchanger body (6) are evenly sprayed. During the spraying process, the staff turns on the three-phase asynchronous motor (4) through the motor controller (104), so that the three-phase asynchronous motor (4) reciprocates and rotates intermittently in both forward and reverse directions. Then, the three-phase asynchronous motor (4) drives the inner ring (3) and the straight-tube heat exchanger body (6) to reciprocate and rotate in both forward and reverse directions through a belt drive structure (5), so that the cleaning liquid continuously flows and impacts on a number of groups of heat exchange straight copper tubes (13), thereby further flushing the dirt on the heat exchange straight copper tubes (13). The flushed sewage is discharged through the first medium discharge pipe (11) or the sewage discharge pipe (9). Compared with the previous knocking cleaning method, this equipment ensures that the copper tubes are evenly sprayed, so that the dirt is fully flushed down, and the copper tubes and plate parts will not be damaged.

3. The high-temperature tubular heat exchanger according to claim 1 or 2, characterized in that, It includes a frame (1). Vertical plates (2) are fixed on the inner walls of both sides of the frame (1). Inner rings (3) are rotatably installed in the two groups of vertical plates (2). A straight-tube heat exchanger body (6) is installed through between the two inner rings (3). A number of groups of high-pressure spray nozzles (7) with equal distance and equal angle are installed on the outer wall of the straight-tube heat exchanger body (6). A check valve (8) is installed at the top of the high-pressure spray nozzle (7). The check valve (8) is connected to an external high-pressure water supply end. A rotary drive assembly for driving the inner ring (3) to rotate is installed on the outer wall of one side of the frame (1). A support table (101) is fixed at one end inside the frame (1). A number of groups of rotary support structures for assisting the straight-tube heat exchanger body (6) to rotate are installed at the top of the support table (101). A motor controller (104) is installed on one side of the bottom end of the support table (101). The output end of the motor controller (104) is electrically connected to the input end of the rotary drive assembly.

4. The high-temperature tubular heat exchanger according to claim 3, characterized in that: A front head (601) and a rear head (603) are respectively installed at both ends of the straight-tube heat exchanger body (6). A second medium inlet pipe (602) and a second medium outlet pipe (604) are respectively installed at the ends of the front head (601) and the rear head (603) away from the straight-tube heat exchanger body (6).

5. The high-temperature tubular heat exchanger according to claim 4, characterized in that: A front tube bundle plate (12) and a rear tube bundle plate (14) are respectively fixed on the inner walls of both sides of the straight-tube heat exchanger body (6). A number of groups of heat exchange straight copper tubes (13) with equal distance are fixed between the front tube bundle plate (12) and the rear tube bundle plate (14). A first medium inlet pipe (10) is installed on one side at the top of the straight-tube heat exchanger body (6). A first medium outlet pipe (11) and a blowdown pipe (9) are respectively installed on both sides at the bottom end of the straight-tube heat exchanger body (6).

6. The high-temperature tubular heat exchanger according to claim 5, characterized in that: The rotary support structure is two bearing seats (102) fixed at the top of the support table (101). An auxiliary wheel (103) is rotatably installed between two adjacent bearing seats (102). The top of the auxiliary wheel (103) is in contact with the outer peripheral surface of the straight-tube heat exchanger body (6).

7. The high-temperature tubular heat exchanger according to claim 6, characterized in that: The rotary drive assembly is a three-phase asynchronous motor (4) installed on the outer wall of one side of the frame (1). The output end of the three-phase asynchronous motor (4) drives the inner ring (3) to rotate through a belt drive structure (5).

8. The high-temperature tubular heat exchanger according to claim 7, wherein: Switch valves are installed at the ends of the first medium inlet pipe (10), the first medium outlet pipe (11), and the blowdown pipe (9).

9. The high-temperature tubular heat exchanger according to claim 8, wherein: The belt drive structure (5) includes a driving wheel installed at the output end of the three-phase asynchronous motor (4) and a driven wheel installed on the surface of the inner ring (3). The driven wheel and the driving wheel are connected by a crawler.

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