Waste heat generator set heat exchanger cleaning device and method

Abstract

The invention discloses a waste heat generator set heat exchanger cleaning device which comprises a generator set, a shell and tube heat exchanger arranged in the generator set and a cooling tower for supplying liquid to the shell and tube heat exchanger, and a refrigerant conveying pipe and a refrigerant return pipe are arranged between the cooling tower and the shell and tube heat exchanger. The device is characterized in that the refrigerant conveying pipe and the refrigerant return pipe are each provided with a first three-way control valve, the two first three-way control valves are externally connected with a cleaning mechanism, and the cleaning mechanism and a heat exchange pipeline in the shell and tube heat exchanger can form an internal circulation cleaning loop through the two first three-way control valves; and heat exchange pipeline adhesion materials in the tube type heat exchanger are circularly washed through the cleaning mechanism. The problem of heat exchange caused by scaling and blocking in a heat exchange pipeline of a heat exchanger of the waste heat generator set can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of cleaning of waste heat generator sets in polyester production, and in particular to a device and method for cleaning a heat exchanger of a waste heat generator set. Background Art

[0002] In recent years, the energy-saving project of using the waste heat of the esterification tail gas of the polyester device to generate electricity in the autumn and winter seasons has been widely used in the polyester production field. According to statistics, the entire group company has reached 104 sets of polyester waste heat generator sets. The power generation efficiency of the waste heat generator set depends on the heat exchange efficiency of the internal heat exchanger. The higher the heat exchange efficiency of the heat exchanger, the higher the efficiency of using waste heat to generate electricity. However, the main reason for the deterioration of the heat exchange effect of the heat exchanger is that the calcium and magnesium ions in the cooling water scale on the inner wall of the heat exchange tube of the heat exchanger, which increases the wall thickness and reduces the cooling water flow. Once the heat exchange efficiency is reduced, the efficiency will be reduced when the waste heat generator set heat exchanger is used to generate electricity in the autumn and winter of the next year. Therefore, it is necessary to clean it before work in the autumn of each year to ensure that the generator set is in a full power state. As the project has been in use for a short time, there is currently no experience or equipment for cleaning waste heat power generation equipment, so we can only contact the cleaning company to clean the equipment. It turned out that the cleaning cost was huge. Later, it was discovered that the equipment would need to be disassembled and cleaned frequently in the future. Based on this reality, it became extremely important to invent a cleaning device for the equipment. So, through our own exploration and combined with the experience of professional cleaning companies, we designed a set of heat exchanger cleaning devices by ourselves, which can effectively clean the inner wall of the heat exchanger pipeline, thereby ensuring the utilization rate of the waste heat of the esterification tail gas of the polyester unit. Summary of the invention

[0003] In order to solve one or some technical problems existing in the prior art, one of the purposes of the present application is to provide a waste heat power generation unit heat exchanger cleaning device, which can solve the problem of reduced power generation efficiency of the waste heat power generation unit due to scaling of the heat exchange pipe. The cleaning cost of the heat exchanger is low, the operation is simple and convenient, and the flexibility is high.

[0004] The second purpose of the present application is to provide a method for cleaning a heat exchanger of a waste heat power generation unit, which is easy and convenient to operate, has low production cost, and is flexible for cleaning different heat exchangers of waste heat power generation units.

[0005] In order to solve the above existing technical problems, one of the purposes of this application is achieved by adopting the following technical solution:

[0006] A heat exchanger cleaning device for a waste heat generator set comprises a generator set, a shell-and-tube heat exchanger arranged in the generator set, and a cooling tower for supplying liquid to the shell-and-tube heat exchanger, a refrigerant delivery pipe and a refrigerant return pipe are arranged between the cooling tower and the shell-and-tube heat exchanger, a first three-way control valve is respectively provided on the refrigerant delivery pipe and the refrigerant return pipe, and a cleaning mechanism is externally connected to the two first three-way control valves. The cleaning mechanism can form an internal circulation cleaning loop with the heat exchange pipes in the shell-and-tube heat exchanger through the two first three-way control valves, and the heat exchange pipes in the shell-and-tube heat exchanger are adhered to the heat exchange pipes through the cleaning mechanism for circulation and flushing.

[0007] Preferably, the cleaning mechanism includes a cleaning liquid storage tank, a cleaning circulation pump, a water inlet pipe of the cleaning liquid storage tank, the cleaning circulation pump and the first three-way control valve on the refrigerant delivery pipe connected in series, and a return pipe with both ends respectively arranged between the cleaning liquid storage tank and the refrigerant return pipe. The cleaning liquid in the cleaning liquid storage tank enters the cleaning circulation pump for flushing after being filtered.

[0008] Preferably, a second three-way control valve is provided on the water inlet pipe between the cleaning circulation pump and the refrigerant delivery pipe, and a return pipe with a reflux control valve is also provided between the second three-way control valve and the cleaning liquid storage tank, and the liquid level of the cleaning liquid storage tank is adjusted by the reflux control valve.

[0009] Preferably, the water inlet pipe and the water return pipe are respectively provided with a liquid inlet valve and a liquid return valve.

[0010] Preferably, the cleaning mechanism further comprises a mobile base, the cleaning liquid storage tank, the cleaning circulation pump and the second three-way control valve are all fixedly mounted on the mobile base, and the water inlet pipe and the water return pipe are both hoses with flanges.

[0011] Preferably, two "n"-shaped protective push rods are provided on the movable base, and two lifting rings are provided on the protective push rods.

[0012] Preferably, the reflux control valve is in a normally open state, and the opening degree of the reflux control valve is 25-30%.

[0013] The second purpose of this application is achieved by the following technical solution:

[0014] A method for cleaning a heat exchanger of a waste heat generator set, comprising the waste heat generator set heat exchanger cleaning device, the cleaning method comprising:

[0015] S1, the generator set and the shell-and-tube heat exchanger are in a non-operating state, and the cooling tower is cut off from supplying condensate to the shell-and-tube heat exchanger;

[0016] S2, connecting the water inlet pipe and the water return pipe to the two first three-way control valves respectively, switching the two first three-way control valves, so that the heat exchange pipe in the shell-and-tube heat exchanger is connected to the cleaning mechanism, thereby forming an internal circulation cleaning loop;

[0017] S3, putting a special cleaning liquid into the cleaning liquid storage tank, and then starting the cleaning circulation pump, so that the special cleaning liquid is transported along the water inlet pipe to the first three-way control valve, and then flows through the first three-way control valve to the refrigerant delivery pipe for pipeline cleaning, and the special cleaning liquid is cleaned inside the shell and tube heat exchanger, and then enters the return water pipe through the refrigerant return pipe and flows back to the cleaning liquid storage tank;

[0018] S4. During cleaning, the concentration of the special cleaning solution is regulated by pH test paper to achieve the best cleaning effect. The cycle cleaning time is 6-8 hours.

[0019] S5. After the cleaning by the cleaning mechanism is completed, the sealing covers on both sides of the shell-and-tube heat exchanger are opened, and then each heat exchange tube is rinsed again with a high-pressure water gun, and the sealing covers are installed after being rinsed clean.

[0020] Preferably, when the special cleaning solution is regulated by the pH test paper, the test is performed every 30 to 40 minutes in the first 2 hours, and every 1 to 2 hours thereafter.

[0021] Preferably, when water is supplied by the cleaning circulation pump, the reflux control valve is opened to a state of 25-30%.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The cleaning mechanism forms an internal circulation cleaning loop with the heat exchange pipes in the shell-and-tube heat exchanger through the two first three-way control valves. After the cleaning mechanism is started, it can clean, soften and remove the scale such as calcium and magnesium ions accumulated on the inner wall of the heat exchange tube in the shell-and-tube heat exchanger, thereby avoiding the problem of reduced power exchange efficiency of the waste heat power generation unit in the power generation process of the next year, so that the waste heat power generation unit can always maintain the full power generation state of the generator set, thereby ensuring the utilization rate of the waste heat of the esterification tail gas of the polyester unit; at the same time, it also solves the problem that the current waste heat power generation unit has no device for cleaning the waste heat power generation equipment. In long-term use, the cleaning cost is lower and the cleaning time is more flexible. It is no longer necessary to entrust external companies to carry out special treatment, thereby reducing the equipment cleaning and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall assembly structure of the present invention;

[0025] Figure 2This is a diagram showing the cleaning effect of some heat exchange tubes in the shell-and-tube heat exchanger of the present invention after being flushed by a high-pressure water gun;

[0026] In the figure: 1. Cleaning mechanism; 11. Cleaning liquid storage tank; 12. Return pipe; 13. Return valve; 14. Inlet valve; 15. Second three-way control valve; 16. Inlet pipe; 17. Cleaning circulation pump; 18. Reflux control valve; 19. Return pipe; 2. Cooling tower; 3. First three-way control valve; 4. Refrigerant delivery pipe; 5. Refrigerant return pipe; 6. Shell and tube heat exchanger; 7. Generator set; 8. Mobile base; 81. Protective push rod; 82. Lifting ring. DETAILED DESCRIPTION

[0027] Below, the present application is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0028] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0029] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0030] Embodiment 1:

[0031] like Figure 1As shown, a heat exchanger cleaning device for a waste heat generator set includes a generator set 7, a shell-and-tube heat exchanger 6 arranged in the generator set 7, and a cooling tower 2 for supplying liquid to the shell-and-tube heat exchanger 6, a refrigerant delivery pipe 4 and a refrigerant return pipe 5 are arranged between the cooling tower 2 and the shell-and-tube heat exchanger 6, a first three-way control valve 3 is respectively provided on the refrigerant delivery pipe 4 and the refrigerant return pipe 5, and a cleaning mechanism 1 is externally connected to the two first three-way control valves 3. The cleaning mechanism 1 can form an internal circulation cleaning loop with the heat exchange pipes in the shell-and-tube heat exchanger 6 through the two first three-way control valves 3, and the heat exchange pipe adhesions in the shell-and-tube heat exchanger 6 are circulated and flushed through the cleaning mechanism 1.

[0032] In actual use, a first three-way control valve 3 is respectively installed on the refrigerant delivery pipe 4 and the refrigerant return pipe 5, so that the existing waste heat generator set 7 heat exchanger cleaning device is connected to the cleaning mechanism 1 through the two first three-way control valves 3. During the operation of the waste heat generator set 7, the refrigerant delivery pipe 4 and the refrigerant return pipe 5 are kept in a smooth state through the first three-way control valve 3. When the waste heat generator set 7 needs to clean the shell and tube heat exchanger 6 during non-working time such as spring, summer and autumn, the first three-way control valve 3 is switched to close the valve ports on the refrigerant delivery pipe 4 and the refrigerant return pipe 5 connected to the cooling tower 2. At the same time, the cleaning mechanism 1 is connected to the shell and tube heat exchanger 6 through the two first three-way control valves 3. The heat exchange pipes in the heat exchanger 6 form an internal circulation cleaning loop, and then the cleaning mechanism 1 is started to clean, soften and remove the scale such as calcium and magnesium ions accumulated on the inner wall of the heat exchange tube in the shell-and-tube heat exchanger 6, thereby avoiding the problem of reduced power exchange efficiency of the waste heat generator set 7 during the power generation process in the next year, so that the waste heat generator set 7 can always maintain the full power state of the generator set 7, thereby ensuring the utilization rate of the waste heat of the esterification tail gas of the polyester device; at the same time, it also solves the problem that the current waste heat generator set 7 has no device for cleaning the waste heat power generation equipment. The cleaning cost is lower during long-term use, and the cleaning time is more flexible. It is no longer necessary to entrust external companies to carry out special treatment, thereby reducing the equipment cleaning and maintenance costs.

[0033] Further improvement is that the cleaning mechanism 1 includes a cleaning liquid storage tank 11, a cleaning circulation pump 17, an inlet pipe 16 of the cleaning liquid storage tank 11, the cleaning circulation pump 17 and the first three-way control valve 3 on the refrigerant delivery pipe 4 connected in series, and a return pipe 12 with both ends respectively arranged between the cleaning liquid storage tank 11 and the refrigerant return pipe 5. The cleaning liquid in the cleaning liquid storage tank 11 enters the cleaning circulation pump 17 for flushing after being filtered.

[0034] When cleaning is performed by the cleaning mechanism 1, the cleaning liquid specially used for cleaning the shell-and-tube heat exchanger 6 is put into the cleaning liquid storage tank 11, and the cleaning liquid is transported to the refrigerant delivery pipe 4 through the water inlet pipe 16 by the cleaning circulation pump 17, and then injected into the heat exchange tubes of the shell-and-tube heat exchanger 6 through the refrigerant delivery pipe 4 for continuous flushing. The impurities flushed down are returned to the cleaning liquid storage tank 11 through the refrigerant return pipe 5 and the return water pipe 12 for filtration, and then the cleaning is supplied again for cleaning by the cleaning circulation pump 17. The whole structure is simple, and the internal pipeline can be unobstructed after cyclic cleaning, thereby ensuring the heat exchange efficiency when power generation is performed again. The cleaning liquid storage tank 11 is equipped with a filter screen, and the filter screen can be removed to flush the impurities filtered out.

[0035] A further improvement is that a second three-way control valve 15 is provided on the water inlet pipe 16 between the cleaning circulation pump 17 and the refrigerant delivery pipe 4, and a return pipe 19 with a reflux control valve 18 is also provided between the second three-way control valve 15 and the cleaning liquid storage tank 11, and the liquid level of the cleaning liquid storage tank 11 is adjusted by the reflux control valve 18; the reflux control valve 18 adopts a normally open state, and the opening degree of the reflux control valve 18 is 25-30%.

[0036] Since the heat exchange tubes in the shell-and-tube heat exchanger 6 will be severely scaled after a winter of heat exchange, and the power of the cleaning circulation pump 17 is in a constant state, at the beginning of flushing, due to the large output flow rate and the small passable flow rate, it is easy to cause the circulation cleaning pipeline to be damaged by excessive water pressure or the cleaning circulation pump 17 to be damaged. At the same time, during the water supply process of the cleaning circulation pump 17, when its flow rate is too large and the internal liquid is insufficient, it is easy to supply water too quickly, resulting in the phenomenon that the liquid in the cleaning liquid storage tank 11 is emptied and not replenished in time, which easily leads to idling of the cleaning circulation pump 17 and damage. Therefore, in order to solve the above problems, the water inlet pipe 16 between the cleaning circulation pump 17 and the refrigerant delivery pipe 4 is A second three-way control valve 15 is installed, and then a return pipe 19 with a reflux control valve 18 is installed between the second three-way control valve 15 and the cleaning liquid storage tank 11. After the cleaning circulation pump 17 is started, the reflux control valve 18 can be appropriately opened in the early stage to allow part of the flushing liquid to directly flow back to the cleaning liquid storage tank 11 through the return pipe 19. This can not only ensure the liquid level height of the cleaning liquid storage tank 11 and avoid the problem of being quickly drained, but also avoid the problem of partial damage to the water channel caused by excessive water pressure. In the later stage, the reflux control valve 18 is adjusted according to the reflux amount of the return pipe 12 to make the water supply pressure more reasonable at different stages, and it is also convenient for the operator to replenish the cleaning liquid in the cleaning liquid storage tank 11 in time. During the cleaning process, it was found that the reflux control valve 18 needed to be adjusted many times. Although the flow control was more reasonable, the operation was troublesome, and it was easy to forget to close the valve due to excessive opening, resulting in insufficient liquid supply in the later cleaning or excessive liquid supply due to forgetting to open the valve in the early stage. Therefore, after using multiple sets of equipment, it was found that when the reflux control valve 18 was normally open at the beginning and the opening of the reflux control valve 18 was about 25-30%, the reflux control valve 18 did not need to be adjusted many times during the entire cleaning process to achieve safe operation, thereby solving the problem of multiple adjustments of the reflux control valve 18 and increasing the power compatibility range of the cleaning circulation pump 17.

[0037] As a further improvement, the water inlet pipe 16 and the water return pipe 12 are provided with a liquid inlet valve 14 and a liquid return valve 13 respectively.

[0038] The water supply and reflux amount of the cleaning liquid can be adjusted by the liquid inlet valve 14 and the liquid return valve 13, so that the cleaning operation of the shell-and-tube heat exchanger 6 is more flexible and adaptable. By closing the liquid inlet valve 14 and the liquid return valve 13 and the cleaning circulation pump 17, the cleaning liquid can remain in the heat exchange tube for long-term retention and dissolution, so that the cleaning circulation pump 17 does not need to be in working state for a long time.

[0039] As a further improvement, the cleaning mechanism 1 also includes a mobile base 8, the cleaning liquid storage tank 11, the cleaning circulation pump 17 and the second three-way control valve 15 are all fixedly installed on the mobile base 8, and the water inlet pipe 16 and the water return pipe 12 are both hoses with flanges.

[0040] Since the group currently has 104 polyester waste heat generator sets 7, the cost is too high and the idle rate is high for each set or several sets to share a cleaning mechanism 1, the later maintenance cost is high, and the cleaning liquid is relatively wasted. Therefore, a mobile base 8 with moving wheels is installed on the cleaning mechanism 1, wherein the cleaning liquid storage tank 11, the cleaning circulation pump 17 and the second three-way control valve 15 are all fixedly installed on the mobile base 8, and the water inlet pipe 16 and the water return pipe 12 are both hoses with flanges. When they are not needed, the water inlet pipe 16 and the water return pipe 12 can be disassembled and stored. When it is necessary to clean each polyester waste heat generator set 7, the water inlet pipe 16 and the water return pipe 12 are first connected to the cleaning liquid storage tank 11, the cleaning circulation pump 17 and the second three-way control valve 15. The pump 17 and the connecting end of the second three-way control valve 15 are connected, and then the water inlet pipe 16 and the return pipe 12 are placed on the mobile base 8, and are moved to the first set of waste heat generator sets 7 that need to be cleaned through the mobile base 8. The water inlet pipe 16 and the return pipe 12 are connected to the first three-way control valve 3 and then flushed. After the first set of flushing is completed, it is only necessary to disassemble the connecting ends of the water inlet pipe 16 and the return pipe 12 and the first three-way control valve 3, and then the mobile base 8 can be used to move to the next set of waste heat generator sets 7 that need to be cleaned for re-docking and cleaning, so that one set of cleaning mechanism 1 can realize the cleaning supply and demand of multiple sets of waste heat generator sets 7, the entire production cost and maintenance cost can be minimized, and the utilization rate of the cleaning fluid is also higher.

[0041] As a further improvement, two “n”-shaped protection push rods 81 are provided on the movable base 8 , and two lifting rings 82 are provided on the protection push rods 81 .

[0042] The protective push rods 81 on both sides of the mobile base 8 are convenient for pushing and pulling in different directions, and can also play a protective role to avoid the occurrence of safety accidents. Since the waste heat generator set 7 will be installed in different areas, such as suspended areas such as rooftops and indoor operating tables, these areas cannot be reached directly by moving and require a crane. Therefore, two lifting rings 82 are provided on the protective push rods 81, so that four lifting rings 82 are formed above the mobile base 8. The lifting rings 82 can enable the cleaning mechanism 1 to move its position more conveniently and stably, thereby meeting the cleaning needs of different waste heat generator sets 7.

[0043] Embodiment 2:

[0044] like Figure 1 and Figure 2As shown, a method for cleaning a heat exchanger of a waste heat generator set includes the waste heat generator set heat exchanger cleaning device, and the cleaning method includes:

[0045] S1, the generator set 7 and the shell-and-tube heat exchanger 6 are in a non-operating state, and the cooling tower 2 cuts off the supply of condensate to the shell-and-tube heat exchanger 6;

[0046] S2, connecting the water inlet pipe 16 and the water return pipe 12 to the two first three-way control valves 3 respectively, switching the two first three-way control valves 3, so that the heat exchange pipe in the shell-and-tube heat exchanger 6 is connected to the cleaning mechanism 1, thereby forming an internal circulation cleaning loop;

[0047] S3, putting a special cleaning liquid into the cleaning liquid storage tank 11, and then starting the cleaning circulation pump 17, so that the special cleaning liquid is transported to the first three-way control valve 3 along the water inlet pipe 16, and then flows through the first three-way control valve 3 to the refrigerant delivery pipe 4 for cleaning the pipeline, and the special cleaning liquid is cleaned inside the shell and tube heat exchanger 6, and then enters the return pipe 12 through the refrigerant return pipe 5 and flows back to the cleaning liquid storage tank 11;

[0048] S4. During cleaning, the concentration of the special cleaning solution is regulated by pH test paper to achieve the best cleaning effect. The cycle cleaning time is 6-8 hours.

[0049] S5. After the cleaning by the cleaning mechanism 1 is completed, the sealing covers on both sides of the shell-and-tube heat exchanger 6 are opened, and then each heat exchange tube is rinsed again with a high-pressure water gun, and the sealing covers are installed after being rinsed clean.

[0050] When the generator set 7 and the shell-and-tube heat exchanger 6 are in the non-working season, they are in a shutdown state, and the refrigerant delivery pipe 4 and the refrigerant return pipe 5 between the cooling tower 2 and the shell-and-tube heat exchanger 6 are also in a non-flowing state. At this time, after switching through the first three-way control valve 3, the liquid supply pipe of the shell-and-tube heat exchanger 6 is connected to the outside through the first three-way control valve 3. If there is still condensate inside, it can be discharged to the outside through the two first three-way control valves 3, and then the water inlet pipe 16 and the water return pipe 12 are respectively connected to the two first three-way control valves 3, so that the heat exchange pipe in the shell-and-tube heat exchanger 6 is connected to the cleaning mechanism 1, thereby forming an internal circulation cleaning loop, and then the agent specially used for cleaning the pipe is mixed with water and configured into a special cleaning liquid storage tank 11. Cleaning liquid, and then start the cleaning circulation pump 17, so that the special cleaning liquid is transported along the water inlet pipe 16 to the first three-way control valve 3, and then flows into the refrigerant delivery pipe 4 through the first three-way control valve 3, and then flows into the heat exchanger to clean the pipeline. The special cleaning liquid is cleaned inside the shell and tube heat exchanger 6 and then enters the return pipe 12 through the refrigerant return pipe 5 and flows back to the cleaning liquid storage tank 11 for impurity filtering. The filtered special cleaning liquid is transported and cleaned again by the cleaning circulation pump 17. The general circulation cleaning time is 6-8 hours, and can also be measured in days. When water is supplied by the cleaning circulation pump 17, the reflux control valve 18 is opened to about 30% of the opening, so that part of the liquid flows back to the cleaning liquid storage tank 11 through the reflux pipe. During the cleaning process, the pH value of the special cleaning liquid is adjusted regularly to keep it within the required pH range. The concentration of the special cleaning liquid is adjusted using pH test paper during cleaning. When the special cleaning liquid is adjusted using pH test paper, since the neutralization speed of impurities in the early stage is slow, the first 2 hours are tested every 30 to 40 minutes to avoid weakening of the effect in the later stage. After 2 hours of circulating flushing, the parts that are easy to fall off have basically been flushed off. Therefore, the test is sufficient every 1-2 hours thereafter, which can achieve the best cleaning effect. After the cleaning is completed by the cleaning mechanism 1, the cleaning mechanism 1 can be disassembled or connected in combination, which can be determined according to the situation. Finally, open the sealing covers on both sides of the shell-and-tube heat exchanger 6 to expose both ends of the shell-and-tube heat exchange tubes, and then use a high-pressure water gun to flush each heat exchange tube to completely clean the remaining adhesions adhering to the tube wall. After flushing, install the sealing covers and wait for the arrival of autumn and winter. After using this method to clean the heat exchange pipeline, the generator set 7 can be kept in a full-power state every year, avoiding the situation where the heat exchange efficiency of the heat exchanger is reduced and the power generation rate is reduced.

[0051] The above-mentioned implementation modes are only preferred implementation modes of the present application and cannot be used to limit the scope of protection of the present application. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present application shall fall within the scope of protection required by the present application.

Claims

1. A heat exchanger cleaning device for a waste heat generator set, comprising a generator set (7), a shell-and-tube heat exchanger (6) arranged in the generator set (7), and a cooling tower (2) for supplying liquid to the shell-and-tube heat exchanger (6), wherein a refrigerant delivery pipe (4) and a refrigerant return pipe (5) are arranged between the cooling tower (2) and the shell-and-tube heat exchanger (6), characterized in that: A first three-way control valve (3) is provided on the refrigerant delivery pipe (4) and the refrigerant return pipe (5), respectively. A cleaning mechanism (1) is externally connected to the two first three-way control valves (3). The cleaning mechanism (1) can form an internal circulation cleaning loop with the heat exchange pipes in the shell-and-tube heat exchanger (6) through the two first three-way control valves (3). Adhesives on the heat exchange pipes in the shell-and-tube heat exchanger (6) are circulated and flushed through the cleaning mechanism (1).

2. The device for cleaning a heat exchanger of a waste heat generator set according to claim 1, characterized in that: The cleaning mechanism (1) includes a cleaning liquid storage tank (11), a cleaning circulation pump (17), a water inlet pipe (16) of the first three-way control valve (3) on the cleaning liquid storage tank (11), the cleaning circulation pump (17) and the refrigerant delivery pipe (4) connected in series, and a return pipe (12) with two ends respectively arranged between the cleaning liquid storage tank (11) and the refrigerant return pipe (5). The cleaning liquid in the cleaning liquid storage tank (11) enters the cleaning circulation pump (17) for flushing after being filtered.

3. The device for cleaning a heat exchanger of a waste heat generator set according to claim 2, characterized in that: A second three-way control valve (15) is provided on the water inlet pipe (16) between the cleaning circulation pump (17) and the refrigerant delivery pipe (4), and a return pipe (19) with a return control valve (18) is also provided between the second three-way control valve (15) and the cleaning liquid storage tank (11), and the liquid level of the cleaning liquid storage tank (11) is adjusted by the return control valve (18).

4. The device for cleaning a heat exchanger of a waste heat generator set according to claim 3, characterized in that: The reflux control valve (18) is in a normally open state, and the opening degree of the reflux control valve (18) is 25-30%.

5. The device for cleaning a heat exchanger of a waste heat generator set according to claim 3, characterized in that: The water inlet pipe (16) and the water return pipe (12) are respectively provided with a liquid inlet valve (14) and a liquid return valve (13).

6. The device for cleaning a heat exchanger of a waste heat power generation unit according to claim 4, characterized in that: The cleaning mechanism (1) also includes a mobile base (8), the cleaning liquid storage tank (11), the cleaning circulation pump (17) and the second three-way control valve (15) are all fixedly mounted on the mobile base (8), and the water inlet pipe (16) and the water return pipe (12) are both hoses with flanges.

7. The device for cleaning a heat exchanger of a waste heat power generation unit according to claim 5, characterized in that: The movable base (8) is provided with two "n"-shaped protection push rods (81), and the protection push rods (81) are provided with two lifting rings (82).

8. A method for cleaning a heat exchanger of a waste heat generator set, characterized in that: The device for cleaning a heat exchanger of a waste heat generator set according to any one of claims 3 to 7, wherein the cleaning method comprises: S1, the generator set (7) and the shell-and-tube heat exchanger (6) are in a non-operating state, and the supply of condensate from the cooling tower (2) to the shell-and-tube heat exchanger (6) is cut off; S2, connecting the water inlet pipe (16) and the water return pipe (12) to the two first three-way control valves (3) respectively, switching the two first three-way control valves (3) so that the heat exchange pipe in the shell-and-tube heat exchanger (6) is connected to the cleaning mechanism (1), thereby forming an internal circulation cleaning loop; S3, a special cleaning liquid is placed in the cleaning liquid storage tank (11), and then the cleaning circulation pump (17) is started, so that the special cleaning liquid is transported along the water inlet pipe (16) to the first three-way control valve (3), and then flows through the first three-way control valve (3) to the refrigerant delivery pipe (4) for cleaning the pipe. After the special cleaning liquid passes through the shell-and-tube heat exchanger (6) for cleaning, it enters the return pipe (12) through the refrigerant return pipe (5) and flows back to the cleaning liquid storage tank (11); S4. During cleaning, the concentration of the special cleaning solution is regulated by pH test paper to achieve the best cleaning effect. The cycle cleaning time is 6-8 hours. S5. After the cleaning by the cleaning mechanism (1) is completed, the sealing covers on both sides of the shell-and-tube heat exchanger (6) are opened, and then each heat exchange tube is flushed again with a high-pressure water gun. After flushing, the sealing covers are installed.

9. A method for cleaning a heat exchanger of a waste heat power generation unit (7) according to claim 6, characterized in that: When the special cleaning solution is regulated by the pH test paper, the test is performed every 30 to 40 minutes for the first 2 hours, and every 1 to 2 hours thereafter.

10. A method for cleaning a heat exchanger of a waste heat power generation unit (7) according to claim 7, characterized in that: When water is supplied by the cleaning circulation pump (17), the reflux control valve (18) is opened to a state of 25-30%.

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