A backwash method and system for a power plant plate heat exchanger

Abstract

The application relates to the technical field of heat exchanger cleaning, in particular to a backwashing method and system for a power station plate heat exchanger. The method comprises the following steps: generating a cleaning cycle according to heat exchanger parameters, setting a cleaning node according to the cleaning cycle, setting cleaning parameters of a cleaning unit according to the cleaning node, generating a scale evaluation value in the heat exchanger, and correcting the cleaning cycle according to the scale evaluation value. The cleaning unit is connected with the heat exchanger, the plate heat exchanger is not disassembled during unit maintenance, the workload of cleaning the power station plate heat exchanger is greatly reduced, and the service life of the plate heat exchanger plate and the rubber strip is prolonged. The cleaning cycle is set according to the internal heat exchange area of different heat exchangers, and the cleaning cycle is dynamically corrected according to operation parameters, so that the heat exchanger internal scale and other impurities can be cleaned in time, the heat exchanger is prevented from being blocked by scale, and the operation risk of the heat exchanger is reduced.

Description

Technical Field

[0001] This application relates to the field of heat exchanger cleaning technology, and in particular to a backflushing method and system for a power plant plate heat exchanger. Background Technology

[0002] The traditional method for cleaning plate heat exchangers in power plants involves maintenance personnel or professional cleaning teams disassembling the units during unit maintenance for manual or chemical cleaning, followed by reinstallation and return to service. This method has the following problems: It cannot clean the heat exchangers in a timely manner. Summer is peak electricity consumption season, with increased unit load, and the presence of abundant poplar and willow catkins with high sediment content easily leads to scaling and blockage of the heat exchangers.

[0003] Traditional cleaning methods can only be performed when the heat exchanger is offline, which is insufficient for the unit's operational needs. Increased water resistance not only increases heat and power losses but also raises operational risks, potentially leading to corrosion and leakage of the stainless steel heat exchanger plates and shortening its lifespan. Cleaning and maintenance are labor-intensive and costly. Heat exchanger cleaning requires shutdown or isolation followed by disassembly and cleaning of each plate individually, resulting in lengthy maintenance periods and the need to replace numerous seals and plates, further increasing material costs. Frequent manual disassembly and cleaning can also damage the equipment. Summary of the Invention

[0004] The purpose of this application is to provide a backflushing method and system for power plant plate heat exchangers to solve the aforementioned technical problems. This allows for direct flushing of the power plant plate heat exchanger without disassembly, saving time, labor, money, and being environmentally friendly, while ensuring the safe and stable operation of the power plant plate heat exchanger.

[0005] In some embodiments of this application, by adding a cleaning unit connected to the heat exchanger, the plate heat exchanger can be cleaned without disassembling it during unit maintenance, which greatly reduces the workload of cleaning the power plant plate heat exchanger and increases the service life of the plate heat exchanger plates and rubber strips.

[0006] In some embodiments of this application, the cleaning cycle is set according to the internal heat exchange area of ​​different heat exchangers, and the cleaning cycle is dynamically adjusted according to the operating parameters, so as to clean the scale and other impurities inside the heat exchanger in a timely manner, avoid scale buildup and blockage of the heat exchanger, and reduce the operating risk of the heat exchanger.

[0007] In some embodiments of this application, a backflushing method for a power plant plate heat exchanger is provided, including:

[0008] A cleaning cycle is generated based on the heat exchanger parameters, and cleaning nodes are set according to the cleaning cycle.

[0009] The cleaning parameters of the cleaning unit are set according to the cleaning nodes, and the scale evaluation value inside the heat exchanger is generated.

[0010] The cleaning cycle is adjusted based on the scale evaluation value.

[0011] In some embodiments of this application, generating a cleaning cycle based on heat exchanger parameters includes:

[0012] The internal heat exchange area 'a' of the heat exchanger is generated based on the heat exchanger parameters.

[0013] The initial cleaning cycle duration t1 is set according to the heat exchange area a inside the heat exchanger.

[0014] The circulating water evaluation value B1 is generated based on the heat exchanger circulating water parameters.

[0015] The total operating time of the heat exchanger is generated based on the heat exchanger parameters.

[0016] A historical operation evaluation value B2 is generated based on the total operating time of the heat exchanger.

[0017] A compensation coefficient m is generated based on the circulating water evaluation value B1 and the historical operation evaluation value B2;

[0018] The cleaning cycle duration is t, where t = m * t1.

[0019] In some embodiments of this application, when setting the initial cleaning cycle duration t1 based on the heat exchange area a inside the heat exchanger, the following is included:

[0020] The internal heat exchange area ranges of the first heat exchanger (A1, A2), the internal heat exchange area ranges of the second heat exchanger (A2, A3), and the internal heat exchange area of ​​the third heat exchanger (A3, A4) are preset.

[0021] The first duration is T1, the second duration is T2, and the third duration is T3, where T1 < T2 < T3;

[0022] If the heat exchange area a inside the heat exchanger is within the range of the area inside the first heat exchanger, the initial cleaning cycle duration t1 is set to a preset third duration T3, i.e., t = T3.

[0023] If the heat exchange area a inside the heat exchanger is within the range of the area inside the second heat exchanger, the initial cleaning cycle duration t1 is set to the preset second duration T2, i.e., t = T2.

[0024] If the heat exchange area a inside the heat exchanger is within the area range inside the third heat exchanger, the initial cleaning cycle duration t1 is set to a preset first duration T1, i.e., t = T1.

[0025] In some embodiments of this application, generating the compensation coefficient m includes:

[0026] Generate the compensation coefficient evaluation value c;

[0027] c = n1 * B1 + n2 * B2, where n1 is the preset first weight coefficient, n2 is the preset second weight coefficient, and n1 + n2 = 1;

[0028] The first compensation coefficient m1, the second compensation coefficient m2 and the third compensation coefficient m3 are preset, and m1 < m2 < m3 < 1;

[0029] The first compensation coefficient evaluation value range (C1, C2), the second compensation coefficient evaluation value range (C2, C3) and the third compensation coefficient evaluation value range (C3, C4) are preset.

[0030] If the compensation coefficient evaluation value c is within the range of the first compensation coefficient evaluation value, the compensation coefficient m is set as the preset third compensation coefficient m3, that is, m = m3;

[0031] If the compensation coefficient evaluation value c is within the range of the second compensation coefficient evaluation value, the compensation coefficient m is set to the preset second compensation coefficient m2, that is, m = m2;

[0032] If the evaluation value c of the compensation coefficient is within the range of the evaluation value of the third compensation coefficient, the compensation coefficient m is set as the preset first compensation coefficient m1, that is, m = m1.

[0033] In some embodiments of this application, when setting the cleaning parameters of the cleaning unit according to the cleaning node, the following are included:

[0034] The flushing time is set according to the heat exchange area a inside the heat exchanger;

[0035] When the rinsing is finished, the initial acid washing time and the initial acid solution dosage are set according to the heat exchange area a inside the heat exchanger, and the initial acid washing time and the initial acid solution dosage are corrected according to the scale evaluation value inside the heat exchanger of the previous cleaning node.

[0036] When pickling is finished, set the amount of alkali solution to be used based on the real-time amount of acid solution used at the current cleaning node.

[0037] When the alkaline washing is finished, the water washing time is set according to the heat exchange area a inside the heat exchanger.

[0038] In some embodiments of this application, when adjusting the cleaning cycle based on the scale evaluation value, the following methods are included:

[0039] Obtain the scale evaluation value d inside the heat exchanger of the current cleaning node, set the correction coefficient n according to the scale evaluation value d, and adjust the duration of the next cleaning cycle according to the correction coefficient n.

[0040] The first scale evaluation value range (D1, D2), the second scale evaluation value range (D2, D3) and the third scale evaluation value range (D3, D4) are preset.

[0041] Preset a first correction coefficient n1, a second correction coefficient n2 and a third correction coefficient n3, and n1 < n2 < n3 < 1;

[0042] If the scale evaluation value d is within the first scale evaluation value range, the correction coefficient n is set to the preset third correction coefficient n3, that is, n = n3;

[0043] If the scale evaluation value d is within the second scale evaluation value range, the correction coefficient n is set to the preset second correction coefficient n2, that is, n = n2;

[0044] If the scale evaluation value d is within the third scale evaluation value range, the correction coefficient n is set to the preset first correction coefficient n1, that is, n = n1.

[0045] In some embodiments of this application, a backflushing system for a power plant plate heat exchanger is provided, comprising:

[0046] Cleaning unit;

[0047] The first branch pipe is connected at one end to the cleaning unit and at the other end to the heat exchanger inlet pipe;

[0048] The second branch pipe is connected at one end to the cleaning unit and at the other end to the heat exchanger outlet pipe.

[0049] The first isolation door is installed on the first branch pipe;

[0050] The second isolation door is installed on the second branch pipe;

[0051] The central control unit is connected to the cleaning unit via a wireless signal, and the central control unit is used to set the operating parameters of the cleaning unit.

[0052] In some embodiments of this application, the central control unit includes:

[0053] The first processing module is used to generate a cleaning cycle based on the heat exchanger parameters and set cleaning nodes based on the cleaning cycle.

[0054] Second processing module: Sets the cleaning parameters of the cleaning unit according to the cleaning nodes;

[0055] The third processing module is used to generate a scale evaluation value inside the heat exchanger and adjust the cleaning cycle based on the scale evaluation value.

[0056] In some embodiments of this application, the first processing module is further configured to:

[0057] The internal heat exchange area 'a' of the heat exchanger is generated based on the heat exchanger parameters.

[0058] The initial cleaning cycle duration t1 is set according to the heat exchange area a inside the heat exchanger.

[0059] The circulating water evaluation value B1 is generated based on the heat exchanger circulating water parameters.

[0060] The total operating time of the heat exchanger is generated based on the heat exchanger parameters.

[0061] A historical operation evaluation value B2 is generated based on the total operating time of the heat exchanger.

[0062] A compensation coefficient m is generated based on the circulating water evaluation value B1 and the historical operation evaluation value B2;

[0063] The cleaning cycle duration is t, where t = m * t1.

[0064] In some embodiments of this application, the second processing module is further configured to:

[0065] The flushing time is set according to the heat exchange area a inside the heat exchanger;

[0066] When the rinsing is finished, the initial acid washing time and the initial acid solution dosage are set according to the heat exchange area a inside the heat exchanger, and the initial acid washing time and the initial acid solution dosage are corrected according to the scale evaluation value inside the heat exchanger of the previous cleaning node.

[0067] When pickling is finished, set the amount of alkali solution to be used based on the real-time amount of acid solution used at the current cleaning node.

[0068] When the alkaline washing is finished, the water washing time is set according to the heat exchange area a inside the heat exchanger.

[0069] Compared with the prior art, the backflushing method and system for a power plant plate heat exchanger disclosed in this application have the following advantages:

[0070] By adding a cleaning unit connected to the heat exchanger, the plate heat exchanger can be cleaned without disassembling it during unit maintenance, which greatly reduces the workload of cleaning the plate heat exchanger in the power plant and increases the service life of the plate heat exchanger plates and rubber strips.

[0071] The cleaning cycle is set according to the internal heat exchange area of ​​different heat exchangers, and the cleaning cycle is dynamically adjusted according to the operating parameters. This ensures that scale and other impurities inside the heat exchanger are cleaned in a timely manner, preventing scale buildup and blockage, and reducing the operational risks of the heat exchanger. Attached Figure Description

[0072] Figure 1 This is a schematic flowchart of a backflushing method for a power plant plate heat exchanger in a preferred embodiment of this application. Detailed Implementation

[0073] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0074] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0075] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0076] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0077] like Figure 1 As shown in the preferred embodiment of this application, a backflushing method for a power plant plate heat exchanger includes:

[0078] S101: Generate a cleaning cycle based on the heat exchanger parameters, and set cleaning nodes based on the cleaning cycle;

[0079] S1O2: Set the cleaning parameters of the cleaning unit according to the cleaning node, and generate the scale evaluation value inside the heat exchanger.

[0080] S103: Adjust the cleaning cycle based on the scale evaluation value.

[0081] Specifically, when generating a cleaning cycle based on heat exchanger parameters, the following are included:

[0082] The internal heat exchange area 'a' of the heat exchanger is generated based on the heat exchanger parameters.

[0083] The initial cleaning cycle duration t1 is set according to the heat exchange area a inside the heat exchanger.

[0084] The circulating water evaluation value B1 is generated based on the heat exchanger circulating water parameters.

[0085] The total operating time of the heat exchanger is generated based on the heat exchanger parameters.

[0086] Historical operation evaluation value B2 is generated based on the total operating time of the heat exchanger;

[0087] The compensation coefficient m is generated based on the circulating water evaluation value B1 and the historical operation evaluation value B2.

[0088] The cleaning cycle duration is t, where t = m * t1.

[0089] Specifically, the value ranges for the circulating water evaluation value and the historical operation evaluation value are the same. The circulating water evaluation value is set based on the quality of the circulating water inside the heat exchanger; the worse the water quality, the higher the corresponding circulating water evaluation value. The historical operation evaluation value is set based on the total operating time of the heat exchanger; the longer the total operating time of the heat exchanger, the higher the corresponding historical operation evaluation value.

[0090] In a preferred embodiment of this application, when setting the initial cleaning cycle duration t1 based on the heat exchange area a inside the heat exchanger, the process includes:

[0091] The internal heat exchange area ranges of the first heat exchanger (A1, A2), the internal heat exchange area ranges of the second heat exchanger (A2, A3), and the internal heat exchange area of ​​the third heat exchanger (A3, A4) are preset.

[0092] The first duration is T1, the second duration is T2, and the third duration is T3, where T1 < T2 < T3;

[0093] If the heat exchange area a inside the heat exchanger is within the area range of the first heat exchanger, the initial cleaning cycle duration t1 is set to the preset third duration T3, i.e., t = T3.

[0094] If the heat exchange area a inside the heat exchanger is within the range of the area inside the second heat exchanger, the initial cleaning cycle duration t1 is set to the preset second duration T2, i.e., t = T2.

[0095] If the heat exchange area a inside the heat exchanger is within the area range of the third heat exchanger, the initial cleaning cycle duration t1 is set to the preset first duration T1, i.e., t = T1.

[0096] Specifically, generating the compensation coefficient m includes:

[0097] Generate the compensation coefficient evaluation value c;

[0098] c = n1 * B1 + n2 * B2, where n1 is the preset first weight coefficient, n2 is the preset second weight coefficient, and n1 + n2 = 1;

[0099] The first compensation coefficient m1, the second compensation coefficient m2 and the third compensation coefficient m3 are preset, and m1 < m2 < m3 < 1;

[0100] The first compensation coefficient evaluation value range (C1, C2), the second compensation coefficient evaluation value range (C2, C3) and the third compensation coefficient evaluation value range (C3, C4) are preset.

[0101] If the compensation coefficient evaluation value c is within the range of the first compensation coefficient evaluation value, the compensation coefficient m is set as the preset third compensation coefficient m3, that is, m = m3;

[0102] If the evaluation value of the compensation coefficient c is within the range of the evaluation value of the second compensation coefficient, the compensation coefficient m is set to the preset second compensation coefficient m2, that is, m = m2;

[0103] If the evaluation value of the compensation coefficient c is within the range of the third compensation coefficient evaluation value, the compensation coefficient m is set as the preset first compensation coefficient m1, that is, m = m1.

[0104] It is understood that in the above embodiments, the cleaning cycle of the heat exchanger is dynamically set according to the heat exchange area inside the heat exchanger, and the compensation coefficient is set by generating a compensation coefficient evaluation value to further adjust the duration of the cleaning cycle, thereby cleaning the scale and other impurities inside the heat exchanger in a timely manner, avoiding scale buildup and blockage, and reducing the operating risk of the heat exchanger.

[0105] In a preferred embodiment of this application, when setting the cleaning parameters of the cleaning unit according to the cleaning node, the following is included:

[0106] The flushing time is set according to the heat exchange area 'a' inside the heat exchanger.

[0107] When the rinsing is finished, the initial acid washing time and the initial acid solution dosage are set according to the heat exchange area a inside the heat exchanger, and the initial acid washing time and the initial acid solution dosage are corrected according to the scale evaluation value inside the heat exchanger of the previous cleaning node.

[0108] When pickling is finished, set the amount of alkali solution to be used based on the real-time amount of acid solution used at the current cleaning node.

[0109] When the alkaline washing is finished, the water washing time is set according to the heat exchange area 'a' inside the heat exchanger.

[0110] Specifically, before pickling, the heat exchanger should be flushed in an open manner. This improves the pickling effect and reduces acid consumption. Pickling: The heat exchanger filled with acid solution is statically immersed. Then, continuous dynamic circulation is performed, alternating between forward and reverse cleaning. After pickling, the pickling solution should be diluted, neutralized, and drained.

[0111] After acid washing, use NaOH and Na3PO4. 4， Softened water is prepared in a specific ratio and used for alkaline washing of the heat exchanger through dynamic circulation to neutralize the acid and prevent further corrosion of the heat exchanger plates. The heat exchanger is then rinsed to thoroughly remove any remaining residue.

[0112] In a preferred embodiment of this application, when adjusting the cleaning cycle based on the scale evaluation value, the following steps are included:

[0113] Obtain the scale evaluation value d inside the heat exchanger of the current cleaning node, set the correction coefficient n based on the scale evaluation value d, and adjust the duration of the next cleaning cycle based on the correction coefficient n.

[0114] The first scale evaluation value range (D1, D2), the second scale evaluation value range (D2, D3) and the third scale evaluation value range (D3, D4) are preset.

[0115] Preset a first correction coefficient n1, a second correction coefficient n2 and a third correction coefficient n3, and n1 < n2 < n3 < 1;

[0116] If the scale evaluation value d is within the first scale evaluation value range, the correction coefficient n is set to the preset third correction coefficient n3, that is, n = n3;

[0117] If the scale evaluation value d is within the second scale evaluation value range, the correction coefficient n is set to the preset second correction coefficient n2, that is, n = n2;

[0118] If the scale evaluation value d is within the third scale evaluation value range, the correction coefficient n is set to the preset first correction coefficient n1, that is, n = n1.

[0119] Specifically, the acid washing solution coming out of the heat exchanger is collected in real time, and a scale evaluation value is generated based on the scale content. The higher the scale content, the higher the scale evaluation value.

[0120] It is understood that in the above embodiments, a correction coefficient is set based on the real-time scale evaluation value, and the duration of the next cleaning cycle is dynamically adjusted to better remove scale from the heat exchanger.

[0121] In another preferred embodiment of the backflushing method for a power plant plate heat exchanger based on any of the above preferred embodiments, a backflushing system for a power plant plate heat exchanger is provided, comprising:

[0122] Cleaning unit;

[0123] The first branch pipe is connected at one end to the cleaning unit and at the other end to the heat exchanger inlet pipe.

[0124] The second branch pipe is connected to the cleaning unit at one end and to the heat exchanger outlet pipe at the other end.

[0125] The first isolation door is installed on the first branch pipe;

[0126] The second isolation door is installed on the second branch pipe;

[0127] The central control unit connects to the cleaning unit via wireless signal and is used to set the operating parameters of the cleaning unit.

[0128] Specifically, the preferred cleaning unit is an electromagnetic pulse cleaner, which combines physical cleaning with chemical cleaning. Through automated cleaning processes such as electromagnetic pulse cleaning, forward and reverse washing, chemical cleaning, and neutralization and discharge, the plate heat exchanger can be cleaned without disassembling during unit maintenance. This greatly reduces the workload of cleaning the plate heat exchanger in the power plant, increases the service life of the plate heat exchanger plates and rubber strips, and thoroughly removes sludge and debris from the plate heat exchanger.

[0129] Specifically, the first isolation door and the second isolation door are preferably backflushing isolation doors, the first branch pipe and the second branch pipe are preferably stainless steel pipes with a diameter of Φ133*4, and the gate valve has a nominal diameter of DN125.

[0130] Specifically, the central control unit includes:

[0131] The first processing module is used to generate a cleaning cycle based on the heat exchanger parameters and set cleaning nodes based on the cleaning cycle.

[0132] Second processing module: Sets the cleaning parameters of the cleaning unit according to the cleaning nodes;

[0133] The third processing module is used to generate a scale evaluation value inside the heat exchanger and adjust the cleaning cycle based on the scale evaluation value.

[0134] Specifically, the first processing module is also used for:

[0135] The internal heat exchange area 'a' of the heat exchanger is generated based on the heat exchanger parameters.

[0136] The initial cleaning cycle duration t1 is set according to the heat exchange area a inside the heat exchanger.

[0137] The circulating water evaluation value B1 is generated based on the heat exchanger circulating water parameters.

[0138] The total operating time of the heat exchanger is generated based on the heat exchanger parameters.

[0139] Historical operation evaluation value B2 is generated based on the total operating time of the heat exchanger;

[0140] The compensation coefficient m is generated based on the circulating water evaluation value B1 and the historical operation evaluation value B2.

[0141] The cleaning cycle duration is t, where t = m * t1.

[0142] Specifically, the second processing module is also used for:

[0143] The flushing time is set according to the heat exchange area 'a' inside the heat exchanger.

[0144] When the rinsing is finished, the initial acid washing time and the initial acid solution dosage are set according to the heat exchange area a inside the heat exchanger, and the initial acid washing time and the initial acid solution dosage are corrected according to the scale evaluation value inside the heat exchanger of the previous cleaning node.

[0145] When pickling is finished, set the amount of alkali solution to be used based on the real-time amount of acid solution used at the current cleaning node.

[0146] When the alkaline washing is finished, the water washing time is set according to the heat exchange area 'a' inside the heat exchanger.

[0147] According to the first concept of this application, by adding a cleaning unit and connecting it to the heat exchanger, the plate heat exchanger can be cleaned without disassembling it during unit maintenance, which greatly reduces the workload of cleaning the plate heat exchanger in the power plant and increases the service life of the plate heat exchanger plates and rubber strips.

[0148] According to the second concept of this application, the cleaning cycle is set according to the internal heat exchange area of ​​different heat exchangers, and the cleaning cycle is dynamically adjusted according to the operating parameters, so as to clean the scale and other impurities inside the heat exchanger in a timely manner, avoid scale buildup and blockage of the heat exchanger, and reduce the operating risk of the heat exchanger.

[0149] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A backflushing method for a power plant plate heat exchanger, characterized in that, include: A cleaning cycle is generated based on the heat exchanger parameters, and cleaning nodes are set according to the cleaning cycle. The cleaning parameters of the cleaning unit are set according to the cleaning nodes, and the scale evaluation value inside the heat exchanger is generated. The cleaning cycle is adjusted based on the scale evaluation value; When generating a cleaning cycle based on heat exchanger parameters, the following are included: The internal heat exchange area 'a' of the heat exchanger is generated based on the heat exchanger parameters. The initial cleaning cycle duration t1 is set according to the heat exchange area a inside the heat exchanger; A circulating water evaluation value B1 is generated based on the circulating water parameters of the heat exchanger. The total operating time of the heat exchanger is generated based on the heat exchanger parameters. A historical operation evaluation value B2 is generated based on the total operating time of the heat exchanger. A compensation coefficient m is generated based on the circulating water evaluation value B1 and the historical operation evaluation value B2; The cleaning cycle duration is t, t=m t1; When setting the initial cleaning cycle duration t1 based on the heat exchange area a inside the heat exchanger, it includes: The internal heat exchange area of ​​the first heat exchanger is preset to be (A1, A2), the internal heat exchange area of ​​the second heat exchanger is preset to be (A2, A3), and the internal heat exchange area of ​​the third heat exchanger is preset to be (A3, A4). Preset a first duration T1, a second duration T2, and a third duration T3, and T1 <T2<T3; If the heat exchange area a inside the heat exchanger is within the range of the area inside the first heat exchanger, the initial cleaning cycle duration t1 is set to a preset third duration T3, i.e., t=T3; If the heat exchange area a inside the heat exchanger is within the range of the area inside the second heat exchanger, the initial cleaning cycle duration t1 is set to a preset second duration T2, i.e., t=T2; If the heat exchange area a inside the heat exchanger is within the area range inside the third heat exchanger, the initial cleaning cycle duration t1 is set to a preset first duration T1, i.e., t=T1. The generation of the compensation coefficient m includes: Generate the compensation coefficient evaluation value c; c=n1 B1+n2 B2, where n1 is a preset first weight coefficient, n2 is a preset second weight coefficient, and n1+n2=1; Preset a first compensation coefficient m1, a second compensation coefficient m2, and a third compensation coefficient m3, and m1 <m2<m3<1; The first compensation coefficient evaluation value range (C1, C2), the second compensation coefficient evaluation value range (C2, C3) and the third compensation coefficient evaluation value range (C3, C4) are preset. If the compensation coefficient evaluation value c is within the range of the first compensation coefficient evaluation value, the compensation coefficient m is set to a preset third compensation coefficient m3, that is, m = m3; If the compensation coefficient evaluation value c is within the range of the second compensation coefficient evaluation value, the compensation coefficient m is set to the preset second compensation coefficient m2, that is, m=m2; If the compensation coefficient evaluation value c is within the range of the third compensation coefficient evaluation value, the compensation coefficient m is set to the preset first compensation coefficient m1, that is, m=m1; When setting the cleaning parameters of the cleaning unit according to the cleaning node, it includes: The flushing time is set according to the heat exchange area a inside the heat exchanger; When the rinsing is finished, the initial acid washing time and the initial acid solution dosage are set according to the heat exchange area a inside the heat exchanger, and the initial acid washing time and the initial acid solution dosage are corrected according to the scale evaluation value inside the heat exchanger of the previous cleaning node. When pickling is finished, set the amount of alkali solution to be used based on the real-time amount of acid solution used at the current cleaning node. When the alkaline washing is finished, the water washing time is set according to the heat exchange area a inside the heat exchanger; When adjusting the cleaning cycle based on the scale evaluation value, the following is included: Obtain the scale evaluation value d inside the heat exchanger of the current cleaning node, set the correction coefficient n according to the scale evaluation value d, and adjust the duration of the next cleaning cycle according to the correction coefficient n. The first scale evaluation value range (D1, D2), the second scale evaluation value range (D2, D3) and the third scale evaluation value range (D3, D4) are preset. Preset a first correction factor n1, a second correction factor n2, and a third correction factor n3, and n1 <n2<n3<1; If the scale evaluation value d is within the first scale evaluation value range, the correction coefficient n is set to a preset third correction coefficient n3, i.e., n = n3; If the scale evaluation value d is within the second scale evaluation value range, the correction coefficient n is set to the preset second correction coefficient n2, that is, n=n2; If the scale evaluation value d is within the third scale evaluation value range, the correction coefficient n is set to the preset first correction coefficient n1, that is, n=n1.

2. A backflushing system for a power plant plate heat exchanger, employing the backflushing method for a power plant plate heat exchanger as described in claim 1, characterized in that, include: Cleaning unit; The first branch pipe is connected at one end to the cleaning unit and at the other end to the heat exchanger inlet pipe; The second branch pipe is connected at one end to the cleaning unit and at the other end to the heat exchanger outlet pipe. The first isolation door is installed on the first branch pipe; The second isolation door is installed on the second branch pipe; The central control unit is connected to the cleaning unit via a wireless signal, and the central control unit is used to set the operating parameters of the cleaning unit. The central control unit includes: The first processing module is used to generate a cleaning cycle based on the heat exchanger parameters and set cleaning nodes based on the cleaning cycle. Second processing module: Sets the cleaning parameters of the cleaning unit according to the cleaning nodes; The third processing module is used to generate a scale evaluation value inside the heat exchanger and adjust the cleaning cycle based on the scale evaluation value. The first processing module is also used for: The internal heat exchange area 'a' of the heat exchanger is generated based on the heat exchanger parameters. The initial cleaning cycle duration t1 is set according to the heat exchange area a inside the heat exchanger; A circulating water evaluation value B1 is generated based on the circulating water parameters of the heat exchanger. The total operating time of the heat exchanger is generated based on the heat exchanger parameters. A historical operation evaluation value B2 is generated based on the total operating time of the heat exchanger. A compensation coefficient m is generated based on the circulating water evaluation value B1 and the historical operation evaluation value B2; The cleaning cycle duration is t, t=m t1.

3. The backflushing system for a power plant plate heat exchanger as described in claim 2, characterized in that, The second processing module is also used for: The flushing time is set according to the heat exchange area a inside the heat exchanger; When the rinsing is finished, the initial acid washing time and the initial acid solution dosage are set according to the heat exchange area a inside the heat exchanger, and the initial acid washing time and the initial acid solution dosage are corrected according to the scale evaluation value inside the heat exchanger of the previous cleaning node. When pickling is finished, set the amount of alkali solution to be used based on the real-time amount of acid solution used at the current cleaning node. When the alkaline washing is finished, the water washing time is set according to the heat exchange area a inside the heat exchanger.

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