A directional flushing system and method for fin tube row of air-cooled condenser

Abstract

The present invention relates to a directional flushing system and method for fin tube rows of air-cooled condenser, the method comprising: during a period when the ambient temperature and the unit load are low, increasing the load of the air-cooling fan, obtaining the air-side outlet temperature of each row of fin tubes of the air-cooled condenser, taking the position of the fin tube with a higher temperature as an input signal, controlling the motor to drive the flushing device and position it at the fin tube with a higher temperature to flush it. The system comprises an online measuring element for the air-side outlet temperature of the fin tube of the air-cooled condenser, a data acquisition and processing device, a position identification device, etc. The present invention uses the position number of each row of fin tubes with a higher air-side outlet temperature of the air-cooled condenser as an input signal to guide the directional positioning flushing of the flushing system, thereby realizing automatic control of the positioning flushing of the air-cooled condenser and achieving the purpose of energy saving and water saving.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power generation, and in particular to a directional flushing system and method for fin tube rows of an air-cooled condenser. Background Art

[0002] The air-cooled condenser is an important equipment at the cold end of the direct air-cooled unit. Its function is to cool the turbine exhaust steam (water vapor) to condense it into water, maintain the turbine exhaust steam at a low pressure and recycle the condensed water. The air-cooled condenser is mainly composed of a steam distribution pipe, several groups of finned tube rows, a condensate tank and a fan. The turbine exhaust steam flows inside the finned tube row, and the fan air flows horizontally through the outside of the finned tube row and cools the internal steam through the finned tube row. The finned tube row is an important heat dissipation surface, which determines the heat transfer performance of the air-cooled condenser and the efficiency of the steam turbine unit. The heat transfer performance of the finned tube is reduced due to scaling and dust accumulation, which leads to an increase in the coal consumption rate of the direct air-cooled unit, affecting the energy utilization efficiency and the unit economy. It is currently a commonly used method to remove dirt and dust accumulation on the surface of the air-cooled condenser by high-pressure water washing to improve the heat exchange performance of the air-cooled condenser.

[0003] However, there has been no good solution for how to judge the degree of dirt or dust accumulation in the air-cooled condenser, when to flush it, and which parts to focus on. Therefore, although the current flushing system has achieved automatic control, it can only achieve automatic control of equipment operation during the flushing process, but cannot achieve automatic identification and control of the flushing position. It has to adopt the method of regular comprehensive flushing. The problem is that flushing is not timely or excessive, resulting in waste of water resources. It takes dozens of hours to flush a 600MW direct air-cooled condenser once, and it consumes thousands of tons of water. If it is thoroughly flushed due to dirt, it usually consumes tens of thousands of tons of water, which runs counter to the purpose of water saving for direct air-cooled units. In addition, in order to prevent accidents caused by large amounts of water dripping on electrical equipment during flushing and freezing, flushing is no longer carried out during the low temperature period in winter. The air-cooled condenser is seriously dusty throughout the winter, affecting performance and also affecting the flushing effect after the beginning of spring the following year.

[0004] In order to solve the problem of cleaning the finned tubes of air-cooled condensers, many domestic units have conducted research and attempts. The relevant research proposed the concept of cleanliness of air-cooled condensers, integrated the air-side outlet temperature of the air-cooled condenser, ambient temperature, fan speed and other factors, established the relationship model between the air-cooled condenser air-side outlet temperature and heat dissipation, heat transfer coefficient, ash thickness, cleanliness, etc., and read the air temperature through the temperature measuring element arranged at the air-cooled condenser air-cooled condenser air outlet, and then calculated the heat transfer coefficient, ash thickness, etc. When the ash thickness reaches a certain value, the finned tube is washed with high-pressure water. In view of the fact that the air-cooled condenser air-cooled condenser air-cooled condenser air outlet temperature is affected by many factors, such as turbine load, turbine and thermal system performance, vacuum device performance, vacuum tightness, ambient wind direction, etc.; in addition, the air-cooled condenser air-cooled condenser air outlet area is large, the density of the measurement point arrangement, the location of the measurement point on the finned tube wall, the fin or the suspended direct contact with the air, etc. will lead to different measurement results, and this difference is not caused by the change of condenser performance.

[0005] Therefore, this model calculation method is difficult to effectively guide flushing; some studies have also measured the air temperature at the air side outlet of the air-cooled condenser, predicted the condenser heat transfer coefficient and the windward wind speed through the BP neural network, and then guided the flushing. The results of this study are the same as the aforementioned model. It is impossible to eliminate the influence of measurement point deviation and many other factors, and the guiding role of flushing is still limited. Although the relevant research fixed the infrared temperature measuring device on the flushing device bracket to achieve the integrated layout and control of temperature measurement and flushing, it still adopts a periodic and comprehensive flushing method, and cannot achieve the purpose of online judgment of the key areas of scaling and dust accumulation and then carry out fixed-point and directional flushing.

[0006] With the development of air-cooled condenser performance monitoring technology, how to locate the local finned tube rows where the heat exchange performance of the condenser changes, and then implement targeted key cleaning to improve the flushing efficiency to ensure that the air-cooled condenser is in a better heat dissipation effect as a whole, has important water-saving and energy-saving value. Summary of the invention

[0007] The object of the present invention is to provide a directional flushing system and method for fin tube rows of an air-cooled condenser, so as to achieve the purpose of improving flushing efficiency, saving water and electricity.

[0008] The present invention provides a directional flushing system for finned tube rows of an air-cooled condenser, comprising a device for determining the position of a finned tube row to be flushed and a device for flushing the finned tube row of an air-cooled condenser;

[0009] The air-cooled condenser fin tube row flushing device comprises an upper slide rail, a motor 1, a flushing nozzle, a slide, a flushing water hose, a motor 2, a lower slide rail and a control device; the upper slide rail and the lower slide rail are arranged in parallel at both ends of the fin tube row in the horizontal direction; the two ends of the slide are respectively connected to the upper slide rail and the lower slide rail; the flushing nozzle is slidably connected to the slide and is connected to a flushing water source through the flushing water hose; the motor 1 is connected to the flushing nozzle and can drive the flushing nozzle to move in the vertical direction along the slide; the motor 2 is connected to the slide and can drive the slide to move in the horizontal direction along the upper slide rail and the lower slide rail; the control device is connected to the motor 1, the motor 2 and the flushing nozzle, and is used to control the start and stop of the motor 1, the motor 2 and the flushing nozzle;

[0010] The device for determining the position of the fin tube row to be flushed includes a camera, a data acquisition and processing device, a fin tube row position mark, a temperature measuring element and a cable; the temperature measuring element and the cable are arranged on the air side of the steam outlet end of the fin tube row of the air-cooled condenser, and the temperature measuring element number corresponds to the fin tube row position mark one by one; the data output end of the temperature measuring element is connected to the data acquisition and processing device, and is used to transmit the temperature measurement data to the data acquisition and processing device; the data acquisition and processing device is used to control the number of fin tube rows whose difference between the outlet air temperature on the air side of the steam outlet end of the fin tube row and the ambient temperature is higher than 10°C to within 20% of the total number of fin tube rows by adjusting the output power of the fan, and transmit the fin tube row position marks whose difference is higher than 10°C to the control system of the air-cooled condenser fin tube row flushing device in order from small to large or from large to small;

[0011] The camera is fixedly connected to the slide, and is used for scanning the fin tube row position mark driven by the slide, and transmitting the scanned data to the control system through the data acquisition and processing device; the control system is used to determine whether the currently scanned fin tube row position mark is consistent with the fin tube row position mark where the difference between the outlet air temperature on the air side of the steam outlet end of the fin tube row and the ambient temperature exceeds 10°C. If so, the motor 2 is controlled to stop, the motor 1 is controlled to start, and the flushing nozzle is driven to move along one end of the slide to the other end, and at the same time, the flushing nozzle is turned on to flush the fin tube row.

[0012] Furthermore, the temperature measuring element is a thermocouple, a thermal resistor, a digital chip temperature measuring element or an infrared temperature measuring element.

[0013] The present invention also provides a directional flushing method for an air-cooled condenser fin tube row, comprising:

[0014] Step 1, obtaining the difference between the air outlet temperature at the steam outlet end of the fin tube exhaust and the ambient temperature;

[0015] Step 2: By adjusting the fan output power, the number of fin tube rows with a temperature difference value higher than 10°C is controlled within 20% of the total number of fin tube rows, the position identifiers of the fin tube rows with a temperature difference value higher than 10°C are obtained, and the obtained position identifiers are sorted;

[0016] Step 3, scan the fin tube row position mark through the scanning device to determine whether the currently scanned fin tube row position mark is consistent with the fin tube row position mark with a temperature difference value greater than 10°C. If so, flush the fin tube row corresponding to the position mark through the air-cooled condenser fin tube row flushing device.

[0017] Furthermore, the air-cooled condenser fin tube row flushing device includes an upper slide rail, a motor 1, a flushing nozzle, a slide, a flushing water hose, a motor 2, a lower slide rail and a control device; the upper slide rail and the lower slide rail are arranged in parallel at both ends of the fin tube row in the horizontal direction; the two ends of the slide are respectively connected to the upper slide rail and the lower slide rail; the flushing nozzle is slidably connected to the slide and is connected to a flushing water source through the flushing water hose; the motor 1 is connected to the flushing nozzle and can drive the flushing nozzle to move in the vertical direction along the slide; the motor 2 is connected to the slide and can drive the slide to move in the horizontal direction along the upper slide rail and the lower slide rail; the control device is connected to the motor 1, the motor 2 and the flushing nozzle, and is used to control the start and stop of the motor 1, the motor 2 and the flushing nozzle.

[0018] Furthermore, the scanning device is a camera, which is fixedly connected to the slide and is used to scan the fin tube row position mark under the drive of the slide, and transmit the scanning data to the control system through the data acquisition and processing device; the control system is used to determine whether the fin tube row position mark currently scanned is consistent with the fin tube row position mark with a temperature difference value exceeding 10°C. If so, the motor 2 is controlled to stop, the motor 1 is controlled to start, and the flushing nozzle is driven to move along one end of the slide to the other end, and at the same time, the flushing nozzle is turned on to flush the fin tube row.

[0019] Furthermore, the outlet air temperature on the air side of the steam outlet end of the fin tube row in step 1 is measured by a temperature measuring element arranged on the air side of the steam outlet end of the fin tube row of the air-to-air condenser.

[0020] By means of the above scheme, the purpose of improving flushing efficiency, saving energy and water can be achieved through the directional flushing system and method of the air-cooled condenser fin tube row.

[0021] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a structural schematic diagram of a directional flushing system for fin tube rows of an air-cooled condenser.

[0023] Numbers in the figure:

[0024] 1-steam distribution pipe; 2-fin tube row; 3-upper slide rail; 4-motor one; 5-flushing nozzle; 6-slide; 7-flushing water hose; 8-camera; 9-data acquisition and processing device; 10-motor two; 11-lower slide rail; 12-position mark; 13-temperature measuring element and cable; 14-condensate tank; 15-fan. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] Ginseng Figure 1 As shown, the present embodiment provides a directional flushing system for finned tube rows of an air-cooled condenser, including a device for determining the position of a finned tube row to be flushed and a flushing device for finned tube rows of an air-cooled condenser; the flushing device for finned tube rows of an air-cooled condenser includes an upper slide rail 3, a motor 1 4, a flushing nozzle 5, a slide 6, a flushing water hose 7, a motor 2 10, a lower slide rail 11 and a control device; the upper slide rail 3 and the lower slide rail 11 are arranged in parallel at both ends of the finned tube row 2 in a horizontal direction; the two ends of the slide 6 are respectively connected to the upper slide rail 3 and the lower slide rail 11; the flushing nozzle 5 is slidably connected to the slide 6 and is connected to a flushing water source through a flushing water hose 7; the motor 1 4 is connected to the flushing nozzle 5, and can drive the flushing nozzle 5 to move in a vertical direction along the slide 6; the motor 2 10 is connected to the slide 6, and can drive the slide 6 to move in a horizontal direction along the upper slide rail 3 and the lower slide rail 11; the control device is connected to the motor 1 4, the motor 2 10, and the flushing nozzle 5, and is used to control the start and stop of the motor 1 4, the motor 2 10, and the flushing nozzle 5;

[0027] The device for determining the position of the fin tube row to be flushed includes a camera 8, a data acquisition and processing device 9, a position mark 12, a temperature measuring element and a cable 13; the temperature measuring element and the cable 13 are arranged on the air side of the steam outlet end of the fin tube row of the air-cooled condenser, and the temperature measuring element number corresponds to the fin tube row position mark 12 one by one; the data output end of the temperature measuring element is connected to the data acquisition and processing device 9, and is used to output the temperature measurement data to the data acquisition and processing device 9; the data acquisition and processing device 9 is used to control the number of fin tube rows whose difference between the outlet air temperature on the air side of the steam outlet end of the fin tube row and the ambient temperature is higher than 10°C within 20% of the total number of fin tube rows by adjusting the output power of the fan 15, and transmit the position marks of the fin tube rows whose difference is higher than 10°C to the control system of the air-cooled condenser fin tube row flushing device in the order of small to large or from large to small;

[0028] The camera 8 is fixedly connected to the slide 6, and is used to scan the fin tube row position mark 12 driven by the slide 6, and transmit the scanned data to the control system of the air-cooled condenser fin tube row flushing device through the data acquisition and processing device 9; when the control system determines that the current position mark 12 is consistent with the received fin tube row position mark with a temperature difference exceeding 10°C, the motor 2 10 is controlled to stop the lateral drive, and the flushing nozzle 5 is driven by the motor 1 4 to move slowly from one end of the slide 6 to the other end, and the flushing nozzle 5 is turned on at the same time to flush the fin tube row. The stroke of the flushing nozzle 5 can be a single stroke along the height of the slide 6, or it can be multiple strokes.

[0029] The air temperature at the outlet of the fin tube exhaust air side is measured by arranging a temperature measuring element in the interval of 0.20m to 2.5m from the steam outlet end of the fin tube exhaust. The temperature measuring element can be a thermocouple, a thermal resistor, a digital chip temperature measuring element, an infrared temperature measuring element, etc.

[0030] The finned tube rows of each air-cooled condenser are numbered in sequence, and a temperature measuring element and a cable 13 are installed on the air side of the steam outlet end of the finned tube row of each air-cooled condenser, and the number of the temperature measuring element corresponds to the number of the finned tube row. By measuring the outlet air temperature of the air side of the steam outlet end of each row of finned tube rows of the air-cooled condenser, and comparing the difference with the ambient temperature; adjusting the fan output power, the number of finned tube rows with a difference higher than 10°C is controlled within 20% of the total number of finned tube rows; the position numbers of the finned tube rows with a difference higher than 10°C are transmitted to the flushing device control system in the order of small to large or from large to small; the control system identifies the position mark of the finned tube row through the camera, and then drives the flushing device to move to the received position mark 12 in sequence through the motor 2 10, and then the motor 1 4 drives the flushing nozzle 5 along the slide 6 from top to bottom or from bottom to top to flush the finned tube row at that location; when the finned tube row at that location is flushed, the motor 1 4 stops working, the motor 2 10 drives the flushing device to the next position mark 12, and then the motor 1 4 drives the flushing nozzle 5 again to flush the finned tube row; this cycle is repeated until all the finned tube rows with a difference higher than 10°C are flushed.

[0031] In other examples, the fin tube rows that need to be flushed and their positions can also be determined by comparing the difference between the air temperature at the outlet of the fin tube exhaust air side and the steam temperature in the steam distribution pipe. In this case, the control strategy is: the difference between the steam temperature and the ambient temperature is A, and the fan output power is adjusted to make the number of fin tube rows with a difference between the steam temperature and the outlet temperature on the fin tube exhaust air side less than (A-10)°C account for less than 20% of the total number of fin tube rows, and the positions of the fin tube rows with a difference less than (A-10)°C are transmitted to the flushing control system.

[0032] The present embodiment also provides a directional flushing method for the fin tube row of an air-cooled condenser. First, the position of the fin tube row that needs to be flushed is determined, and the position is obtained by mapping the temperature measuring element number; then the determined fin tube row position number is input into the flushing device control system, and the motor 2 drives the flushing device to move to the fin tube row position corresponding to the position number. During the movement of the flushing device, the position mark at the bottom of the fin tube row is identified by the camera. When the identified position mark is consistent with the received position mark, the motor 2 stops, and then the motor 1 drives the flushing nozzle to move along the slide from top to bottom or from bottom to top while flushing until the fin tube row corresponding to the position number is flushed; then the motor 2 continues to drive the flushing device to the fin tube row corresponding to the next position number that needs to be flushed, and continues to flush it; this cycle is repeated until all the fin tube rows that need to be flushed are flushed.

[0033] This embodiment determines the position of the fin tube row that needs to be flushed by measuring the difference between the air temperature at the fin tube discharge outlet and the ambient temperature, and then uses it as an input signal to control the motor to drive the flushing device to move to the target position, and uses the camera to identify the position identification symbol, and finally stops the flushing device in turn at the fin tube row that needs to be flushed for directional flushing, thereby achieving directional flushing of the air-cooled condenser fin tube row and avoiding uniform flushing of a large area, which can save electricity, water and time and improve the flushing efficiency.

[0034] In this embodiment, the method for obtaining the position of the fin tube row that needs to be flushed includes:

[0035] The finned tube row of each air-cooled condenser is numbered in sequence, and a temperature measuring element is installed on the air side of the steam outlet end of each air-cooled condenser finned tube row, and the temperature measuring element number corresponds to the finned tube row number one by one. Adjust the fan output power, and transmit the air outlet temperature and ambient temperature of the finned tube row air side to the data acquisition and processing device. When the number of finned tube rows with a difference of more than 10°C between the two reaches 20% of the total number of finned tube rows, stop adjusting the fan output power. The temperature measuring element numbers with a difference of more than 10°C correspond to the finned tube row numbers that need to be flushed, and the position of the finned tube row that needs to be flushed can be determined; the data acquisition and processing device records all the finned tube row numbers that need to be flushed and transmits them to the flushing device control system in order from small to large or from large to small.

[0036] In this embodiment, the method for obtaining the position of the fin tube row that needs to be flushed may also be:

[0037] By comparing the difference between the steam temperature and the ambient temperature and the difference between the steam temperature and the air temperature at the outlet of the finned tube of the air condenser, the position of the finned tube row that needs to be flushed is determined:

[0038] Adjust the fan frequency, and transmit the steam temperature and the air outlet temperature of the fin tube exhaust air side to the data acquisition and processing device. When the number of fin tube rows where the difference between the steam temperature and the air outlet temperature of the fin tube exhaust air side is at least 10°C lower than the difference between the steam temperature and the ambient temperature accounts for 20% of the total number of fin tube rows, stop adjusting the fan output power. The numbers of the temperature measuring elements of these tube rows correspond to the positions of the fin tube rows that need to be flushed. The data acquisition and processing device records the numbers of all fin tube rows that need to be flushed and transmits them to the flushing device control system in the order of small to large or large to small.

[0039] In this embodiment, after the flushing device control system receives the number of the tube row that needs to be flushed, it starts the motor 2 10 to drive the flushing device to move horizontally as a whole, and at the same time turns on the camera to scan the fin tube row position code fixed on the condensate tank and transmits it to the data acquisition and processing device. When the scanned fin tube row position code is consistent with the fin tube row number transmitted to the flushing device control system by the data acquisition and processing device, it proves that the entire flushing device is exactly in the position of the fin tube row that needs to be flushed, and the drive motor 2 10 stops running, starts the motor 1 4, turns on the flushing nozzle 5, and flushes the fin tube row at that position from top to bottom or from bottom to top. After the driving motor 1 completes a single stroke or a reciprocating stroke, the motor 1 4 is stopped, and the motor 2 10 and the camera 5 are started again. The motor 2 drives the entire flushing device to move to the next position. The camera scans the position code of the fin tube row. When the scanned position code is consistent with the position code transmitted by the data acquisition and processing device, the motor 2 is stopped, and the motor 1 and the flushing nozzle are started to flush the fin tube row at that position. This process is repeated until all the fin tube rows that need to be flushed are flushed. Then, the motor 2 is started again to move the entire flushing device to the initial position, usually one end of each row of air-cooled islands.

[0040] After flushing one side of a row of air-to-condenser according to the above steps, flush the other side of the row in the same way; then flush the other rows of air-to-condenser in turn using the same steps and methods until all the fin tube rows that need to be flushed are cleaned.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A directional flushing system for finned tubes of an air-cooled condenser, characterized in that: It includes a device for determining the position of the finned tube row to be washed and a device for washing the finned tube row of an air-cooled condenser; The air-cooled condenser fin tube row flushing device comprises an upper slide rail, a motor 1, a flushing nozzle, a slide, a flushing water hose, a motor 2, a lower slide rail and a control device; the upper slide rail and the lower slide rail are arranged in parallel at both ends of the fin tube row in the horizontal direction; the two ends of the slide are respectively connected to the upper slide rail and the lower slide rail; the flushing nozzle is slidably connected to the slide and is connected to a flushing water source through the flushing water hose; the motor 1 is connected to the flushing nozzle and can drive the flushing nozzle to move in the vertical direction along the slide; the motor 2 is connected to the slide and can drive the slide to move in the horizontal direction along the upper slide rail and the lower slide rail; the control device is connected to the motor 1, the motor 2 and the flushing nozzle, and is used to control the start and stop of the motor 1, the motor 2 and the flushing nozzle; The device for determining the position of the fin tube row to be flushed includes a camera, a data acquisition and processing device, a fin tube row position mark, a temperature measuring element and a cable; the temperature measuring element and the cable are arranged on the air side of the steam outlet end of the fin tube row of the air-cooled condenser, and the temperature measuring element number corresponds to the fin tube row position mark one by one; the data output end of the temperature measuring element is connected to the data acquisition and processing device, and is used to transmit the temperature measurement data to the data acquisition and processing device; the data acquisition and processing device is used to control the number of fin tube rows whose difference between the outlet air temperature on the air side of the steam outlet end of the fin tube row and the ambient temperature is higher than 10°C to within 20% of the total number of fin tube rows by adjusting the output power of the fan, and transmit the fin tube row position marks whose difference is higher than 10°C to the control system of the air-cooled condenser fin tube row flushing device in an order from small to large or from large to small; The camera is fixedly connected to the slide, and is used to scan the position mark of the fin tube row driven by the slide, and transmit the scanned data to the control system through the data acquisition and processing device; the control system is used to determine whether the currently scanned fin tube row position mark is consistent with the fin tube row position mark where the difference between the air outlet temperature on the air side of the steam outlet end of the fin tube row and the ambient temperature exceeds 10°C, and if so, control the motor 2 to stop, control the motor 1 to start, drive the flushing nozzle to move along one end of the slide to the other end, and at the same time open the flushing nozzle to flush the fin tube row; A temperature measuring element is arranged within a range of 0.20m to 2.5m from the steam outlet of the fin tube exhaust; the temperature measuring element is a thermocouple, a thermal resistor, a digital chip temperature measuring element or an infrared temperature measuring element.

2. A directional flushing method for finned tube rows of air-cooled condensers, characterized in that: include: Step 1, obtaining the difference between the air outlet temperature at the steam outlet end of the fin tube exhaust and the ambient temperature; Step 2: By adjusting the fan output power, the number of fin tube rows with a temperature difference value higher than 10°C is controlled within 20% of the total number of fin tube rows, the position identifiers of the fin tube rows with a temperature difference value higher than 10°C are obtained, and the obtained position identifiers are sorted; Step 3, scanning the fin tube row position mark by a scanning device, determining whether the currently scanned fin tube row position mark is consistent with the fin tube row position mark with a temperature difference value higher than 10°C, and if so, flushing the fin tube row corresponding to the position mark by an air-cooled condenser fin tube row flushing device; The air-cooled condenser fin tube row flushing device comprises an upper slide rail, a motor 1, a flushing nozzle, a slide, a flushing water hose, a motor 2, a lower slide rail and a control device; the upper slide rail and the lower slide rail are arranged in parallel at both ends of the fin tube row in the horizontal direction; the two ends of the slide are respectively connected to the upper slide rail and the lower slide rail; the flushing nozzle is slidably connected to the slide and is connected to a flushing water source through the flushing water hose; the motor 1 is connected to the flushing nozzle and can drive the flushing nozzle to move in the vertical direction along the slide; the motor 2 is connected to the slide and can drive the slide to move in the horizontal direction along the upper slide rail and the lower slide rail; the control device is connected to the motor 1, the motor 2 and the flushing nozzle, and is used to control the start and stop of the motor 1, the motor 2 and the flushing nozzle; The scanning device is a camera, which is fixedly connected to the slide and is used to scan the position mark of the fin tube row driven by the slide, and transmit the scanning data to the control system through the data acquisition and processing device; the control system is used to determine whether the position mark of the fin tube row currently scanned is consistent with the position mark of the fin tube row with a temperature difference value exceeding 10°C. If so, the motor 2 is controlled to stop, the motor 1 is controlled to start, and the flushing nozzle is driven to move from one end of the slide to the other end, and the flushing nozzle is turned on to flush the fin tube row; The outlet air temperature on the air side of the steam outlet end of the fin tube row in step 1 is measured by a temperature measuring element arranged on the air side of the steam outlet end of the fin tube row of the air-to-air condenser.

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