Online cleaning system and online cleaning method for heat exchanger

Abstract

The invention relates to an online cleaning system and method for a heat exchanger. The heat exchanger comprises a plurality of flue gas heat exchangers for the low-temperature economizer. The on-line cleaning system comprises a water supply main flow path, a first water supply flow path, a plurality of first cleaning flow paths, a main circulation flow path and a first drainage flow path. And the water supply main flow path is used for introducing a heat exchange medium into the boiler. The first water supply flow path is used for being in on-off communication with the water supply main flow path. Inlets of the multiple first cleaning flow paths communicate with the first water supply flow path, and the multiple flue gas heat exchangers correspond to the multiple first cleaning flow paths one to one and are connected to the corresponding first cleaning flow paths in series. The main circulation flow path communicates between the first cleaning flow path and the first water supply flow path so as to circulate the heat exchange medium circulating in the corresponding first cleaning flow path. The first drainage flow path communicates with outlets of the multiple first cleaning flow paths so as to be used for discharging the heat exchange medium. The on-line cleaning system can effectively improve the power generation efficiency of the generator set.

Description

Technical Field

[0001] The present disclosure relates to the technical field of energy conservation in power plants, and in particular to an online cleaning system and an online cleaning method for a heat exchanger. Background Art

[0002] In the face of the country's increasingly high energy-saving and consumption-reducing requirements for thermal power generation, it is necessary to transform the key equipment that affects the efficiency of the unit to improve the unit's operating efficiency, reduce power generation costs, and improve economic and social benefits. By setting up a low-temperature economizer to effectively utilize the flue gas waste heat, a better energy-saving effect can be achieved, and it is also helpful to improve the dust removal efficiency.

[0003] Usually, a low-temperature economizer includes multiple flue gas heat exchangers. During the manufacturing, transportation, on-site storage and installation of a newly installed low-temperature economizer, the inner wall of the flue gas heat exchanger will inevitably produce some corrosion products and be contaminated. In order to ensure the safe operation of the generator set and ensure that the water vapor quality of the generator set is qualified as soon as possible during the commissioning process, these impurities must be removed.

[0004] In the related art, the low-temperature economizer is usually cleaned by static flushing when the generator set is shut down for maintenance. However, when the cleaning time of the low-temperature economizer is longer than the shutdown time of the generator set, the generator set will need to wait until the low-temperature economizer cleaning work is completed before it can be restarted, which undoubtedly wastes the effective power generation time of the generator set.

[0005] Therefore, there is an urgent need to provide an online cleaning system and an online cleaning method for a heat exchanger, so as to realize the simultaneous operation of the low-temperature economizer cleaning work and the power generation work of the generator set, and improve the power generation efficiency of the generator set. Summary of the invention

[0006] The purpose of the present disclosure is to provide an online cleaning system and an online cleaning method for a heat exchanger, so as to realize the simultaneous operation of low-temperature economizer cleaning work and generator set power generation work, improve the power generation efficiency of the generator set, and at least solve the related technical problems.

[0007] In order to achieve the above-mentioned object, according to the first aspect of the present disclosure, a heat exchanger online cleaning system is provided. The heat exchanger includes a plurality of flue gas heat exchangers for a low-temperature economizer, and the online cleaning system includes: The main water supply flow path is used to introduce heat exchange medium into the boiler; A first water supply flow path, used for being connected to the main water supply flow path in an on-off manner; A plurality of first cleaning flow paths, wherein the inlets of the plurality of first cleaning flow paths are connected to the first water supply flow path, and the plurality of flue gas heat exchangers correspond to the plurality of first cleaning flow paths one by one and are connected in series to the corresponding first cleaning flow paths; a main circulation flow path, the main circulation flow path being connected between the first cleaning flow path and the first water supply flow path, for circulating the heat exchange medium flowing in the corresponding first cleaning flow path; A first drainage flow path is connected to the outlets of the plurality of first cleaning flow paths to discharge the heat exchange medium.

[0008] Optionally, the main water supply flow path includes a water supply main pipe, the first water supply flow path includes a first water supply pipe and a first water supply switch assembly provided on the first water supply pipe, the first cleaning flow path includes a first cleaning pipe and a first cleaning switch assembly provided on the first cleaning pipe, the main circulation flow path includes a main circulation pipe, a main circulation pump and a main switch assembly, the main circulation pump and the main switch assembly are both provided on the main circulation pipe, and the first drainage flow path includes a first drainage pipe and a first drainage switch assembly provided on the first drainage pipe; wherein The inlet end of the first water supply pipe is connected to the water supply main pipe, the outlet ends of the first water supply pipes are connected to the inlet ends of the multiple first cleaning pipes, the outlet ends of the multiple first cleaning pipes are connected to the inlet of the first drainage pipe, and the main circulation pipe is connected between the multiple first cleaning pipes and the first water supply pipe.

[0009] Optionally, the online cleaning system also includes a second drainage path, which includes a second drain pipe and a second drainage switch assembly arranged on the second drain pipe, the inlet of the second drain pipe is connected to the multiple first cleaning pipes, and the second drain pipe is located upstream of the first drain pipe.

[0010] Optionally, the online cleaning system also includes a secondary circulation flow circuit, which includes a secondary circulation pipe, a secondary circulation pump and a secondary switch assembly, the secondary circulation pump and the secondary switch assembly are both arranged on the secondary circulation pipe, the main circulation pipe is connected between the multiple first cleaning pipes and the first water supply pipe, and the secondary circulation pipe is connected in parallel with the main circulation pipe.

[0011] Optionally, the online cleaning system further comprises a plurality of second cleaning flow paths, the plurality of second cleaning flow paths correspond to the plurality of first cleaning flow paths one by one, and the second cleaning flow paths are connected in parallel with the first cleaning flow paths; The second cleaning flow path includes a second cleaning pipe and a second cleaning switch assembly arranged on the second cleaning pipe. The second cleaning pipe is located upstream of the flue gas heat exchanger. Both ends of the second cleaning pipe are respectively connected to the first cleaning pipe.

[0012] Optionally, the online cleaning system also includes multiple third cleaning flow paths, multiple heater heat exchangers for secondary air heating, a second water supply flow path and a third drainage flow path, the second water supply flow path is used to be connected to the total water supply flow path in a switchable manner, the inlet of the third cleaning flow path is connected to the second water supply flow path, the multiple heater heat exchangers correspond one-to-one to the multiple third cleaning flow paths, and are connected in series with the corresponding third cleaning flow paths, and the third drainage flow path is connected to the outlets of the multiple third cleaning flow paths for discharging the heat exchange medium.

[0013] Optionally, the second water supply flow path includes a second water supply pipe and a second water supply switch assembly provided on the second water supply pipe, the third cleaning flow path includes a third cleaning pipe and a third cleaning switch assembly provided on the third cleaning pipe, and the third drainage flow path includes a third drainage pipe and a third drainage switch assembly provided on the third drainage pipe; wherein The inlet end of the second water supply pipe is connected to the water supply main, the outlet end of the second water supply pipe is connected to the inlet ends of the plurality of third cleaning pipes, and the outlet ends of the third cleaning pipes are all connected to the inlet of the third drainage pipe.

[0014] Optionally, the online cleaning system also includes a main connecting flow path, which includes a main connecting pipe and a main connecting switch arranged on the main connecting pipe, the inlet of the main connecting pipe is connected to the outlets of the multiple first cleaning flow paths and the multiple second cleaning flow paths, and the outlet of the main connecting pipe is connected to the second water supply flow path.

[0015] Optionally, the online cleaning system further includes a secondary connecting flow path, the secondary connecting flow path includes a secondary connecting pipe and a secondary connecting switch provided on the secondary connecting pipe, and the secondary connecting pipe is connected in parallel with the main connecting pipe.

[0016] According to a second aspect of the present disclosure, an online cleaning method of an online cleaning system is provided. The heat exchanger includes a plurality of flue gas heat exchangers for a low-temperature economizer. Based on the online cleaning system described above, the online cleaning method includes: Passing the heat exchange medium in the water supply main flow path into at least one first cleaning flow path through the first water supply flow path; In the first cleaning flow path, the heat exchange medium can be introduced into the corresponding flue gas heat exchanger; In the main circulation flow path, the heat exchange medium can continuously circulate in the first water supply flow path, the first cleaning flow path and the corresponding flue gas heat exchanger; In the first drain flow path, the heat exchange medium can be discharged through the first drain flow path.

[0017] Through the above technical scheme, the heat exchanger online cleaning system and online cleaning method are provided. Among them, in the technical scheme disclosed in the present invention, a part of the heat exchange medium in the total water supply flow path is introduced into the first cleaning flow path through the first water supply flow path to clean the flue gas heat exchanger connected in series on the first cleaning flow path. At the same time, the main circulation flow path can be used to circulate the heat exchange medium in the first water supply flow path and the first cleaning flow path to achieve the purpose of circulating cleaning of the corresponding flue gas heat exchanger, which can effectively ensure the cleaning quality and save the use of heat exchange medium. Finally, the heat exchange medium is discharged through the first drainage flow path. This online cleaning system can realize the online cleaning of the flue gas heat exchanger without affecting the water supply from the total water supply flow path to the boiler to achieve the purpose of power generation of the generator set, avoiding the entire generator set waiting for the cleaning process of the flue gas heat exchanger, and rationally planning the cleaning process of the flue gas heat exchanger and the power generation process of the generator set, effectively improving the power generation efficiency of the entire generator set.

[0018] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 It is a schematic diagram of the principle of an online cleaning system provided according to an embodiment of the present disclosure.

[0020] Description of Reference Numerals 1. Heat exchanger online cleaning system; 11. Main water supply flow path; 111. Main water supply pipe; 12. first water supply flow path; 121. first water supply pipe; 122. first water supply switch assembly; 13. First cleaning flow path; 131. First cleaning pipe; 132. First cleaning switch assembly; 14. Main circulation flow path; 141. Main circulation pipe; 142. Main circulation pump; 143. Main switch assembly; 15. First drainage flow path; 151. First drainage pipe; 152. First drainage switch assembly; 16. Second drainage flow path; 161. Second drainage pipe; 162. Second drainage switch assembly; 17. Auxiliary circulation flow path; 171. Auxiliary circulation pipe; 172. Auxiliary circulation pump; 173. Auxiliary switch assembly; 18. second cleaning flow path; 181. second cleaning pipe; 182. second cleaning switch assembly; 19. third cleaning flow path; 191. third cleaning pipe; 192. third cleaning switch assembly; 20. Second water supply flow path; 201. Second water supply pipe; 202. Second water supply switch assembly; 21. a third drainage flow path; 211. a third drainage pipe; 212. a third drainage switch assembly; 22. Main connection flow path; 221. Main connection pipe; 222. Main connection switch; 23. Auxiliary connection flow path; 231. Auxiliary connection pipe; 232. Auxiliary connection switch; 24. Flue gas heat exchanger; 25. Heat exchanger for heater; 26. Pressure measuring device. DETAILED DESCRIPTION

[0021] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0022] In the present disclosure, unless otherwise specified, directional words such as "up, down, left, right" generally refer to the position when used by the user; "inside, outside" refer to the inside and outside of the corresponding component contour; in addition, it should be noted that the terms used, such as "first, second", etc., are intended to distinguish one element from another.

[0023] According to the first embodiment of the present disclosure, Figure 1 As shown, a heat exchanger online cleaning system 1 is provided. The heat exchanger may include a plurality of flue gas heat exchangers 24 for a low-temperature economizer. The online cleaning system may include a water supply main flow path 11, a first water supply flow path 12, a plurality of first cleaning flow paths 13, a main circulation flow path 14 and a first drainage flow path 15. The water supply main flow path 11 is used to introduce a heat exchange medium into the boiler. The first water supply flow path 12 is used to be connected to the water supply main flow path 11 in an on-off manner. The inlets of the plurality of first cleaning flow paths 13 are connected to the first water supply flow path 12. The plurality of flue gas heat exchangers 24 correspond to the plurality of first cleaning flow paths 13 one by one and are connected in series to the corresponding first cleaning flow paths 13. The main circulation flow path 14 is connected between the first cleaning flow path 13 and the first water supply flow path 12 to circulate the heat exchange medium flowing in the corresponding first cleaning flow path 13. The first drainage flow path 15 is connected to the outlets of the plurality of first cleaning flow paths 13 to discharge the heat exchange medium.

[0024] In the technical solution disclosed in the present invention, a part of the heat exchange medium in the water supply main flow path 11 is introduced into the first cleaning flow path 13 through the first water supply flow path 12 to clean the flue gas heat exchanger 24 connected in series to the first cleaning flow path 13. At the same time, the main circulation flow path 14 can be used to circulate the heat exchange medium in the first water supply flow path 12 and the first cleaning flow path 13 to achieve the purpose of circulating and cleaning the corresponding flue gas heat exchanger 24, which can effectively ensure the cleaning quality and save the use of heat exchange medium. Finally, the heat exchange medium is discharged through the first drainage flow path 15. This online cleaning system can realize the online cleaning of the flue gas heat exchanger 24 without affecting the water supply main flow path 11 to supply water to the boiler to achieve the purpose of power generation of the generator set, avoiding the entire generator set waiting for the cleaning process of the flue gas heat exchanger 24, and rationally planning the cleaning process of the flue gas heat exchanger 24 and the power generation process of the generator set, effectively improving the power generation efficiency of the entire generator set.

[0025] In some embodiments, Figure 1 As shown, the water supply main flow path 11 may include a water supply main pipe 111. The first water supply flow path 12 includes a first water supply pipe 121 and a first water supply switch assembly 122 provided on the first water supply pipe 121. The first cleaning flow path 13 may include a first cleaning pipe 131 and a first cleaning switch assembly 132 provided on the first cleaning pipe 131. The main circulation flow path 14 may include a main circulation pipe 141, a main circulation pump 142 and a main switch assembly 143. The main circulation pump 142 and the main switch assembly 143 are both provided on the main circulation pipe 141. The first drainage flow path 15 may include a first drainage pipe 151 and a first drainage switch assembly 152 provided on the first drainage pipe 151. Among them, the inlet end of the first water supply pipe 121 is connected to the water supply main pipe 111. The outlet ends of the first water supply pipe 121 are all connected to the inlet ends of the plurality of first cleaning pipes 131. The outlet ends of the plurality of first cleaning pipes 131 are all connected to the inlet of the first drainage pipe 151. The main circulation pipe 141 is connected between the plurality of first cleaning pipes 131 and the first water supply pipe 121 .

[0026] During the cleaning process of the corresponding flue gas heat exchanger 24, the operator can open the first water supply switch assembly 122, the first cleaning switch assembly 132, the main switch assembly 143 and the main circulation pump 142. As a result, the heat exchange medium in the water supply main pipe 111 can flow through the first water supply pipe 121, the first cleaning pipe 131, the corresponding flue gas heat exchanger 24, and the main circulation pipe 141 in sequence to achieve the purpose of cleaning the flue gas heat exchanger 24. It can be understood that the operator can clean a single flue gas heat exchanger 24, or clean multiple flue gas heat exchangers 24 in batches at the same time, which can be adjusted according to actual cleaning needs. After the cleaning is completed, the operator can control the closing of the first water supply switch assembly 122, the first cleaning switch assembly 132, the main switch assembly 143 and the main circulation pump 142, and open the first drainage switch assembly 152 at the same time, so that the heat exchange medium after cleaning can be discharged through the first cleaning pipe 131. It should be noted that the first water supply switch assembly 122, the first cleaning switch assembly 132, the main switch assembly 143 and the first drainage switch assembly 152 can be understood as any suitable switch structure, such as a manual valve, a solenoid valve, etc., and are not limited here. Those skilled in the art can make design choices based on actual conditions.

[0027] In some embodiments, Figure 1 As shown, the online cleaning system may also include a second drainage flow path 16. The second drainage flow path 16 may include a second drainage pipe 161 and a second drainage switch assembly 162 provided on the second drainage pipe 161. The inlet of the second drainage pipe 161 is connected to the plurality of first cleaning pipes 131, and the second drainage pipe 161 is located upstream of the first drainage pipe 151. The provision of the second drainage flow path 16 can further improve the drainage reliability of the online cleaning system on the one hand. When the first drainage flow path 15 fails, the drainage purpose can be achieved through the second drainage flow path 16. Furthermore, the second drainage flow path 16 is located upstream of the first drainage flow path 15, that is, the second drainage flow path 16 can achieve the purpose of drainage without the heat exchange medium flowing through the flue gas heat exchanger 24, which can avoid the recycled heat exchange medium from polluting the flue gas heat exchanger 24 after cleaning to a certain extent. Furthermore, when cleaning multiple flue gas heat exchangers 24, the operator can control the first cleaning flow path 13 and the second cleaning flow path 18 to be fully opened to quickly discharge the heat exchange medium, which can further shorten the cleaning time of the flue gas heat exchanger 24 and improve the cleaning efficiency. It should be noted that the second drainage switch assembly 162 can be understood as any suitable switch structure, such as a manual valve, a solenoid valve, etc., which is not limited here, and those skilled in the art can design and select according to actual conditions.

[0028] In some embodiments, Figure 1As shown, the online cleaning system may also include a secondary circulation flow path 17. The secondary circulation flow path 17 may include a secondary circulation pipe 171, a secondary circulation pump 172 and a secondary switch assembly 173. The secondary circulation pump 172 and the secondary switch assembly 173 are both arranged on the secondary circulation pipe 171. The main circulation pipe 141 is connected between the plurality of first cleaning pipes 131 and the first water supply pipe 121, and the secondary circulation pipe 171 is connected in parallel with the main circulation pipe 141. The setting of the secondary circulation flow path 17 improves the reliability of the circulation cleaning of the online cleaning system. When the main circulation flow path 14 fails, the purpose of circulating the heat exchange medium can be achieved in time through the secondary circulation flow path 17 to ensure the reliable operation of the online cleaning system. It should be noted that the secondary switch assembly 173 can be understood as any suitable switch structure, such as a manual valve, a solenoid valve, etc., which is not limited here, and those skilled in the art can design and select according to actual conditions.

[0029] In some embodiments, Figure 1 As shown, the online cleaning system may also include a plurality of second cleaning flow paths 18. The plurality of second cleaning flow paths 18 correspond one to one with the plurality of first cleaning flow paths 13, and the second cleaning flow paths 18 and the first cleaning flow paths 13 are connected in parallel. The second cleaning flow path 18 may include a second cleaning pipe 181 and a second cleaning switch assembly 182 provided on the second cleaning pipe 181. The second cleaning pipe 181 is located upstream of the flue gas heat exchanger 24. Both ends of the second cleaning pipe 181 are connected to the first cleaning pipe 131, respectively. The provision of the second cleaning flow path 18 improves the reliability of the cleaning of the online cleaning system. When the first cleaning flow path 13 fails, the purpose of cleaning can be achieved in time through the second cleaning flow path 18 to ensure the reliable operation of the online cleaning system. It should be noted that the second cleaning switch assembly 182 can be understood as any suitable switch structure, such as a manual valve, a solenoid valve, etc., which is not limited here, and those skilled in the art can design and select according to actual conditions.

[0030] In some embodiments, Figure 1As shown, the online cleaning system may also include a plurality of third cleaning flow paths 19, a plurality of heater heat exchangers 25 for secondary air heating, a second water supply flow path 20 and a third drainage flow path 21. The second water supply flow path 20 is used to be connected to the water supply main flow path 11 in an on-off manner. The inlet of the third cleaning flow path 19 is connected to the second water supply flow path 20. The plurality of heater heat exchangers 25 correspond one-to-one to the plurality of third cleaning flow paths 19 and are connected in series with the corresponding third cleaning flow paths 19. The third drainage flow path 21 is connected to the outlets of the plurality of third cleaning flow paths 19 for discharging the heat exchange medium. When in use, in the technical solution disclosed in the present invention, a portion of the heat exchange medium in the water supply main flow path 11 is passed into the third cleaning flow path 19 through the second water supply flow path 20 to clean the heater heat exchanger 25 connected in series to the third cleaning flow path 19, and finally the heat exchange medium is discharged through the third drainage flow path 21. The online cleaning system can realize online cleaning of the heater heat exchanger 25 without affecting the water supply of the main water supply path 11 to the boiler to achieve the power generation purpose of the generator set, further avoiding the whole generator set waiting for the cleaning process of the heater heat exchanger 25, rationally planning the cleaning process of the heater heat exchanger 25 and the power generation process of the generator set, and effectively improving the power generation efficiency of the whole generator set.

[0031] It should be noted here that in the non-cleaning state, that is, the flue gas heat exchanger 24 and the heater heat exchanger 25 are both connected to the unit and are in operation, the heat exchange medium is first introduced into the corresponding flue gas heat exchanger 24 through the first water supply path 12 and the first cleaning path 13, and the flue gas heat exchanger 24 can reliably absorb the heat in the flue gas, which enables the heat exchange medium in the flue gas heat exchanger 24 to be heated and the temperature can be increased. Furthermore, the heat exchange medium after absorbing heat can further flow into the heater heat exchanger 25 through the third cleaning path 19, so that the heater heat exchanger 25 can heat the cold secondary air. Finally, the heat exchange medium can be merged into the main water supply path 11 again through the second water supply path 20.

[0032] Then, the online cleaning system provided in this solution can not only clean the flue gas heat exchanger 24, but also clean the heater heat exchanger 25. The reliability of each working device is further guaranteed. At the same time, the cleaning of the flue gas heat exchanger 24 and the heater heat exchanger 25 does not affect the normal operation of the unit, and also guarantees the power generation efficiency of the generator set to a certain extent.

[0033] In some embodiments, Figure 1As shown, the second water supply flow path 20 may include a second water supply pipe 201 and a second water supply switch assembly 202 provided on the second water supply pipe 201. The third cleaning flow path 19 may include a third cleaning pipe 191 and a third cleaning switch assembly 192 provided on the third cleaning pipe 191. The third drainage flow path 21 may include a third drainage pipe 211 and a third drainage switch assembly 212 provided on the third drainage pipe 211. The inlet end of the second water supply pipe 201 is connected to the water supply main 111. The outlet end of the second water supply pipe 201 is connected to the inlet end of multiple third cleaning pipes 191. The outlet ends of the third cleaning pipes 191 are all connected to the inlet of the third drainage pipe 211.

[0034] During the cleaning process of the corresponding heater heat exchanger 25, the operator can open the second water supply switch assembly 202 and the third cleaning switch assembly 192. As a result, the heat exchange medium in the water supply main 111 can flow through the second water supply pipe 201, the third cleaning pipe 191, and the corresponding heater heat exchanger 25 in sequence to achieve the purpose of cleaning the heater heat exchanger 25. It can be understood that the operator can clean a single heater heat exchanger 25, or clean multiple heater heat exchangers 25 in batches at the same time, which can be adjusted according to actual cleaning needs. After the cleaning is completed, the operator can control the closing of the second water supply switch assembly 202 and the third cleaning switch assembly 192, and open the third drainage switch assembly 212 at the same time, so that the heat exchange medium after cleaning can be discharged through the third cleaning pipe 191. It should be noted that the second water supply switch assembly 202, the third cleaning switch assembly 192 and the third drainage switch assembly 212 can be understood as any suitable switch structure, such as a manual valve, a solenoid valve, etc., and are not limited here. Those skilled in the art can make design choices based on actual conditions.

[0035] In some embodiments, Figure 1As shown, the online cleaning system may further include a main connecting flow path 22. The main connecting flow path 22 may include a main connecting pipe 221 and a main connecting switch 222 provided on the main connecting pipe 221. The inlet of the main connecting pipe 221 is connected to the outlets of the plurality of first cleaning flow paths 13 and the plurality of second cleaning flow paths 18. The outlet of the main connecting pipe 221 is connected to the second water supply flow path 20. The setting of the main connecting flow path 22 in this embodiment can achieve the purpose that in a non-cleaning state, the heat exchange medium can directly flow into the water supply main flow path 11 through the main connecting flow path 22 after absorbing the heat in the flue gas only through the flue gas heat exchanger 24. The setting of the main connecting flow path 22 can prevent the heater heat exchanger 25 from affecting the normal use of the flue gas heat exchanger 24 when it fails, thereby improving the operating reliability of the entire generator set. It should be noted that the main connecting switch 222 can be understood as any suitable switch structure, such as a manual valve, a solenoid valve, etc., which is not limited here, and those skilled in the art can design and select according to actual conditions.

[0036] In some embodiments, Figure 1 As shown, the online cleaning system may also include a secondary connection flow path 23. The secondary connection flow path 23 includes a secondary connection pipe 231 and a secondary connection switch 232 arranged on the secondary connection pipe 231. The secondary connection pipe 231 is connected in parallel with the main connection pipe 221. The provision of the secondary connection flow path 23 improves the operational reliability of the generator set. When a failure occurs in the main connection flow path 22, the purpose of energy-saving power generation can be achieved in time through the secondary connection flow path 23. It should be noted that the secondary connection switch 232 can be understood as any suitable switch structure, such as a manual valve, a solenoid valve, etc., which is not limited here, and those skilled in the art can make design choices based on actual conditions.

[0037] In some embodiments, Figure 1 As shown, the online cleaning system may further include a pressure measuring device 26. The pressure measuring device 26 is connected to the first water supply pipe 121 to measure the pressure of the heat exchange medium introduced into the first cleaning pipe 131. The pressure measuring device 26 may be a pressure gauge. The provision of the pressure measuring device 26 can further improve the reliability of monitoring the pressure of the heat exchange medium during the cleaning process of the entire online cleaning system, thereby ensuring the reliable operation of the online cleaning system.

[0038] According to a second embodiment of the present disclosure, an online cleaning method of an online cleaning system is provided. The heat exchanger may include a plurality of flue gas heat exchangers 24 for a low-temperature economizer. Based on the above-mentioned online cleaning system, the online cleaning method may include: passing the heat exchange medium in the water supply main flow path 11 into at least one first cleaning flow path 13 through the first water supply flow path 12. In the first cleaning flow path 13, the heat exchange medium can be passed into the corresponding flue gas heat exchanger 24. In the main circulation flow path 14, the heat exchange medium can continue to circulate in the first water supply flow path 12, the first cleaning flow path 13 and the corresponding flue gas heat exchanger 24. In the first drainage flow path 15, the heat exchange medium can be discharged via the first drainage flow path 15.

[0039] In the technical solution disclosed in the present invention, a part of the heat exchange medium in the water supply main flow path 11 is introduced into the first cleaning flow path 13 through the first water supply flow path 12 to clean the flue gas heat exchanger 24 connected in series to the first cleaning flow path 13. At the same time, the main circulation flow path 14 can be used to circulate the heat exchange medium in the first water supply flow path 12 and the first cleaning flow path 13 to achieve the purpose of circulating and cleaning the corresponding flue gas heat exchanger 24, which can effectively ensure the cleaning quality and save the use of heat exchange medium. Finally, the heat exchange medium is discharged through the first drainage flow path 15. This online cleaning method can realize the online cleaning of the flue gas heat exchanger 24 without affecting the water supply main flow path 11 to supply water to the boiler to achieve the purpose of power generation of the generator set, avoiding the entire generator set waiting for the cleaning process of the flue gas heat exchanger 24, and rationally planning the cleaning process of the flue gas heat exchanger 24 and the power generation process of the generator set, effectively improving the power generation efficiency of the entire generator set.

[0040] It is understandable that the heat exchanger may further include a heater heat exchanger 25 for secondary air heating. Based on the above-mentioned online cleaning system, the online cleaning method may include: passing the heat exchange medium in the water supply main flow path 11 into at least one third cleaning flow path 19 through the second water supply flow path 20. In the third cleaning flow path 19, the heat exchange medium can be passed into the corresponding heater heat exchanger 25. In the third drainage flow path 21, the heat exchange medium can be discharged via the third drainage flow path 21.

[0041] The online cleaning method provided in this solution can not only clean the flue gas heat exchanger 24, but also clean the heater heat exchanger 25. The reliability of each working device is further guaranteed. At the same time, the cleaning of the flue gas heat exchanger 24 and the heater heat exchanger 25 does not affect the normal operation of the unit, and also guarantees the power generation efficiency of the generator set to a certain extent.

[0042] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0043] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0044] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A heat exchanger online cleaning system, wherein the heat exchanger comprises a plurality of flue gas heat exchangers for a low-temperature economizer, characterized in that: The online cleaning system comprises: The main water supply flow path is used to introduce heat exchange medium into the boiler; A first water supply flow path, used for being connected to the main water supply flow path in an on-off manner; A plurality of first cleaning flow paths, wherein the inlets of the plurality of first cleaning flow paths are connected to the first water supply flow path, and the plurality of flue gas heat exchangers correspond to the plurality of first cleaning flow paths one by one and are connected in series to the corresponding first cleaning flow paths; a main circulation flow path, the main circulation flow path being connected between the first cleaning flow path and the first water supply flow path, for circulating the heat exchange medium flowing in the corresponding first cleaning flow path; A first drainage flow path is connected to the outlets of the plurality of first cleaning flow paths to discharge the heat exchange medium.

2. The online cleaning system according to claim 1, characterized in that: The water supply main flow path includes a water supply main pipe, the first water supply flow path includes a first water supply pipe and a first water supply switch assembly provided on the first water supply pipe, the first cleaning flow path includes a first cleaning pipe and a first cleaning switch assembly provided on the first cleaning pipe, the main circulation flow path includes a main circulation pipe, a main circulation pump and a main switch assembly, the main circulation pump and the main switch assembly are both provided on the main circulation pipe, and the first drainage flow path includes a first drainage pipe and a first drainage switch assembly provided on the first drainage pipe; in The inlet end of the first water supply pipe is connected to the water supply main pipe, the outlet ends of the first water supply pipes are connected to the inlet ends of the multiple first cleaning pipes, the outlet ends of the multiple first cleaning pipes are connected to the inlet of the first drainage pipe, and the main circulation pipe is connected between the multiple first cleaning pipes and the first water supply pipe.

3. The online cleaning system according to claim 2, characterized in that: It also includes a second drainage flow path, which includes a second drainage pipe and a second drainage switch assembly arranged on the second drainage pipe. The inlet of the second drainage pipe is connected to the multiple first cleaning pipes, and the second drainage pipe is located upstream of the first drainage pipe.

4. The online cleaning system according to claim 2, characterized in that: It also includes a secondary circulation flow path, which includes a secondary circulation pipe, a secondary circulation pump and a secondary switch assembly. The secondary circulation pump and the secondary switch assembly are both arranged on the secondary circulation pipe. The main circulation pipe is connected between the multiple first cleaning pipes and the first water supply pipe, and the secondary circulation pipe is connected in parallel with the main circulation pipe.

5. The online cleaning system according to claim 2, characterized in that: It also includes a plurality of second cleaning flow paths, the plurality of second cleaning flow paths correspond to the plurality of first cleaning flow paths one by one, and the second cleaning flow paths are connected in parallel with the first cleaning flow paths; The second cleaning flow path includes a second cleaning pipe and a second cleaning switch assembly arranged on the second cleaning pipe. The second cleaning pipe is located upstream of the flue gas heat exchanger. Both ends of the second cleaning pipe are respectively connected to the first cleaning pipe.

6. The online cleaning system according to any one of claims 1 to 5, characterized in that: It also includes multiple third cleaning flow paths, multiple heater heat exchangers for secondary air heating, a second water supply flow path and a third drainage flow path. The second water supply flow path is used to be connected and disconnected with the total water supply flow path. The inlet of the third cleaning flow path is connected to the second water supply flow path. The multiple heater heat exchangers correspond to the multiple third cleaning flow paths one by one and are connected in series with the corresponding third cleaning flow paths. The third drainage flow path is connected to the outlets of the multiple third cleaning flow paths for discharging the heat exchange medium.

7. The online cleaning system according to claim 6, characterized in that: The second water supply flow path includes a second water supply pipe and a second water supply switch assembly provided on the second water supply pipe, the third cleaning flow path includes a third cleaning pipe and a third cleaning switch assembly provided on the third cleaning pipe, and the third drainage flow path includes a third drainage pipe and a third drainage switch assembly provided on the third drainage pipe; wherein The inlet end of the second water supply pipe is connected to the water supply main, the outlet end of the second water supply pipe is connected to the inlet ends of the plurality of third cleaning pipes, and the outlet ends of the third cleaning pipes are all connected to the inlet of the third drainage pipe.

8. The online cleaning system according to claim 6, characterized in that: It also includes a main connecting flow path, which includes a main connecting pipe and a main connecting switch arranged on the main connecting pipe, the inlet of the main connecting pipe is connected to the outlets of the multiple first cleaning flow paths and the multiple second cleaning flow paths, and the outlet of the main connecting pipe is connected to the second water supply flow path.

9. The online cleaning system according to claim 1, characterized in that: It also includes a secondary connecting flow path, which includes a secondary connecting pipe and a secondary connecting switch arranged on the secondary connecting pipe, and the secondary connecting pipe is connected in parallel with the main connecting pipe.

10. An online cleaning method for an online cleaning system, wherein the heat exchanger comprises a plurality of flue gas heat exchangers for a low-temperature economizer, characterized in that: Based on the online cleaning system according to any one of claims 1 to 9, the online cleaning method comprises: Passing the heat exchange medium in the water supply main flow path into at least one first cleaning flow path through the first water supply flow path; In the first cleaning flow path, the heat exchange medium can be introduced into the corresponding flue gas heat exchanger; In the main circulation flow path, the heat exchange medium can continuously circulate in the first water supply flow path, the first cleaning flow path and the corresponding flue gas heat exchanger; In the first drain flow path, the heat exchange medium can be discharged through the first drain flow path.

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