Condenser heat exchange tube full-coverage cleaning equipment and cleaning method

Abstract

The condenser full-coverage cleaning equipment comprises a main water pipe, nozzle branch pipes and nozzles, the nozzles are installed at the two ends of the nozzle branch pipes, the nozzle branch pipes are arranged on the main water pipe in rows, the nozzles are designed to have different lengths according to the distance so as to make the cleaning water flow of the nozzles uniform, and the nozzle branch pipes are designed to have different lengths according to the distribution characteristics of heat exchange pipes. The minimum length of the nozzle branch pipes is larger than the maximum length of the fixed and transmission structure which drives the nozzle branch pipes to move, heat exchange pipes at the two ends of the most edge of the pipe plate face are cleaned, and then full-coverage cleaning of the condenser heat exchange pipes is achieved. By the adoption of the device, the cleaning capacity of all the nozzles can be evenly distributed, the cleaning coverage rate of the pipe face of a condenser heat exchange pipe and the cleaning coverage rate of the heat exchange pipe in the depth direction can be increased, and full-coverage cleaning is achieved; meanwhile, the condenser heat exchange tube full-coverage cleaning equipment and the cleaning logic have the advantages of being scientific in design, free of dead angle coverage in cleaning and high in practicability.

Description

Technical Field

[0001] This invention relates to a condenser full-coverage cleaning device and cleaning logic, specifically to the field of underwater cleaning of heat exchange tubes in the condenser water chamber. Background Technology

[0002] After long-term operation, condensers often experience fouling on the heat exchange tube walls, leading to reduced heat exchange efficiency. Online condenser cleaning robots play a crucial role in mitigating this problem. In current publicly available technologies, nozzles are typically arranged close together at a distance equal to the distance between adjacent heat exchange tubes. However, the fixing and transmission structures that drive the nozzles are usually wider than the nozzles themselves, meaning the nozzles are within the projection of these structures onto the tube sheet surface. Consequently, the outermost rows of heat exchange tubes on a conventional rectangular tube sheet cannot be cleaned due to interference from the related structures and water chambers; this problem is even more pronounced in trapezoidal tube sheet cases. Therefore, there is a need to research a device that can improve the cleaning coverage of online condenser cleaning robots. Summary of the Invention

[0003] The purpose of this invention is to address the deficiencies in the existing technology and provide a condenser full-coverage cleaning device and cleaning logic, which can effectively improve the cleaning coverage of the condenser online cleaning robot and basically achieve full-coverage cleaning.

[0004] In existing technical solutions, the nozzle is usually located in the middle part of the structure that drives the nozzle row fixing and transmission. That is, the projection of the nozzle on the tube sheet surface is generally within the projection of the rear structure on the tube sheet surface. This will cause the edge of the rear structure to contact the edge of the water chamber first when cleaning the edge of the condenser water chamber, thus preventing the heat exchange tubes near the edge of the water chamber from being cleaned. Therefore, the cleaning coverage is not comprehensive.

[0005] To address the above problems, the technical solution provided by this invention is as follows: A condenser heat exchanger tube full-coverage cleaning device includes a main water pipe, nozzle branch pipes, and nozzles. The nozzle branch pipes are movably mounted on the tube sheet surface via a transmission mechanism. The nozzles are located at both ends of the nozzle branch pipes. Cleaning water flows through the main water pipe into the nozzle branch pipes and is sprayed out by the nozzles. The length of the nozzle branch pipes satisfies the following condition: when the transmission mechanism moves to its left or right travel edge on the tube sheet surface, the projection of the corresponding nozzle on the tube sheet surface is outside the projection of the transmission mechanism on the tube sheet surface (i.e., considering the lateral position, the projection of the left nozzle should be located to the left of the transmission mechanism projection, and the projection of the right nozzle should be located to the right of the transmission mechanism projection). The nozzle length is designed according to the distance from the main water pipe inlet: the farther the distance from the main water pipe inlet, the shorter the nozzle length.

[0006] Furthermore, the main water pipe is arranged longitudinally in the water chamber, and the nozzles are divided into multiple pipes, arranged in parallel on the main water pipe.

[0007] This invention extends the nozzle's installation position beyond the projection of the transmission mechanism that drives its movement onto the tube sheet surface. This ensures that the relevant structures do not interfere with the water chamber when cleaning the heat exchange tubes at both ends of the tube sheet, thereby improving the cleaning coverage of the heat exchange tubes. Simultaneously, the design of the nozzle length ensures uniformity of the cleaning water flow rate across all nozzles, guaranteeing consistent cleaning capacity.

[0008] When the transmission mechanism has only one lateral degree of freedom, the nozzle is divided into multiple pipes, which are arranged in a row corresponding to the heat exchange tubes and fixed on the fixed transmission seat. The fixed transmission seat is mounted on the tube sheet surface and can be moved left and right by the transmission mechanism. The projection of the nozzle on the tube sheet surface is outside the projection of the fixed transmission seat on the tube sheet surface.

[0009] When the transmission mechanism has both longitudinal and transverse degrees of freedom, the nozzles are divided into multiple sections, equally distributed according to the number of rows of heat exchange tubes, and fixedly mounted on a fixed transmission base. The transmission mechanism includes a first transmission shaft and a second transmission shaft. The fixed transmission base is mounted on the second transmission shaft, which can move up and down via a drive assembly, and the drive assembly is mounted on the first transmission shaft, which can move left and right. The projection of the nozzles on the tube sheet surface is outside the projection of the fixed transmission base on the tube sheet and the second transmission shaft. By equally distributing the nozzles, the number of nozzle sections 42 can be reduced, thereby achieving a larger single-tube cleaning flow rate under the same cleaning water source conditions. This improves the cleaning coverage in the depth direction of the heat exchange tubes, allowing cleaning even deep within the heat exchange tubes.

[0010] The first and second drive shafts can be driven by screws and nuts.

[0011] Furthermore, the formula for calculating the length of the nozzle mentioned above is as follows: , C is a constant. ; in, f is the nozzle length in meters. p D1 is the Darcy friction factor of the main water pipe, n is the number of nozzles; D2 is the nozzle diameter in meters; A2 is the nozzle cross-sectional area in square meters. 2 ;f n D is the Darcy friction factor of the nozzle. h The hydraulic pressure of the main water pipe is measured in meters (m); A p The cross-sectional area of ​​the main water pipe, in meters. 2 ; d is the distance from the nozzle to the main water pipe inlet, in meters; Water supply pressure, in Pa; Fluid density, in kg / m³ 3 q represents the uniform flow rate of the nozzle, in meters per second (m³). 3 / s;K inThe local loss coefficient at the main water pipe inlet, K ent This is the local loss coefficient at the nozzle inlet.

[0012] The above calculations allow for the reasonable design of nozzle lengths at each location, thereby ensuring consistent cleaning flow rates at each nozzle.

[0013] The present invention also provides a method for performing full-coverage cleaning of condenser heat exchanger tubes using the aforementioned condenser heat exchanger tube full-coverage cleaning equipment.

[0014] When the transmission mechanism has one degree of freedom, the cleaning of all heat exchange tubes on the entire tube sheet can be completed by the fixed transmission seat moving back and forth laterally during heat exchange tube cleaning.

[0015] When the transmission mechanism has two degrees of freedom, the total number of heat exchange tube rows is a. If m nozzles are designed to divide the tubes into m equal parts, and a = m·n, then after each horizontal movement to clean the entire row, it is necessary to move vertically by one heat exchange tube row spacing to clean the next row. A total of n heat exchange tube row spacings need to be moved vertically to complete the cleaning of all heat exchange tubes on the entire tube sheet.

[0016] The present invention has the following advantages over the prior art: This invention optimizes the nozzle installation structure to ensure the nozzles can reach the heat exchange tubes at both ends of the tube sheet, further improving the cleaning coverage of the condenser online cleaning robot. Theoretically, it can achieve 100% full coverage cleaning. Simultaneously, nozzles at different distances from the cleaning water inlet are designed with varying lengths to achieve a uniform distribution of cleaning water flow, ensuring consistent cleaning capability across all nozzles. Combined with a 2-degree-of-freedom transmission scheme, the cleaning flow rate per tube is increased, enhancing cleaning coverage deep within the heat exchange tubes. This invention improves the cleaning coverage of the condenser online cleaning robot, solves the problem of insufficient coverage of the heat exchange tubes at both ends in existing technologies, and also addresses the issue of poor cleaning coverage deep within the heat exchange tubes. It offers a comprehensive advantage of enhanced performance, scientific design, and strong practicality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the condenser heat exchanger tube full-coverage cleaning device of the present invention; Figure 2 for Figure 1 A magnified view of a portion of point A in the middle. Detailed Implementation

[0018] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0019] like Figure 1As shown, the present invention discloses a condenser heat exchanger tube full-coverage cleaning device 4, comprising a main water pipe 41, nozzle branch pipes 42, and nozzles 43. Multiple nozzle branch pipes 42 are equidistantly fixed on a fixed transmission base 6. A nozzle 43 is installed at each end of a nozzle branch pipe 42. The minimum length of each nozzle branch pipe 42 should be greater than the maximum length (in the lateral direction) of the fixed transmission base 6 and the transmission mechanism driving its movement, ensuring that the nozzle 43 is outside the projection of the fixed and transmission structures (in this example, the fixed transmission base and transmission mechanism) driving its movement onto the tube sheet surface. Each nozzle 43 is designed with different lengths according to its distance from the water inlet; longer nozzles are used closer to the water inlet, and shorter nozzles are used farther away, achieving uniform distribution of cleaning water flow among the nozzles and ensuring consistent cleaning capacity of each nozzle.

[0020] Furthermore, the nozzle length is calculated according to the following fitting formula: , C is a constant. ; in, f is the nozzle length in meters. p D1 is the Darcy friction factor of the main water pipe, n is the number of nozzles; D2 is the nozzle diameter in meters; A2 is the nozzle cross-sectional area in square meters. 2 ;f n D is the Darcy friction factor of the nozzle. h The hydraulic pressure of the main water pipe is measured in meters (m); A p The cross-sectional area of ​​the main water pipe, in meters. 2 ; d is the distance from the nozzle to the main water pipe inlet, in meters; Water supply pressure, in Pa; Fluid density, in kg / m³ 3 q represents the uniform flow rate of the nozzle, in meters per second (m³). 3 / s;K in The local loss coefficient at the main water pipe inlet, K ent This is the local loss coefficient at the nozzle inlet.

[0021] The above calculations allow for the reasonable design of nozzle lengths at each location, thereby ensuring consistent cleaning flow rates at each nozzle.

[0022] Furthermore, the nozzle branch pipes 42 can have different lengths to adapt to the arrangement shape of the heat exchange tubes at both ends of the water chamber or tube sheet. As shown in the trapezoidal water chamber 5 in this embodiment, the nozzle branch pipes can be arranged in the same trapezoidal shape, with the same length distribution from top to bottom.

[0023] The transmission mechanism shown in this example has two degrees of freedom: a first transmission shaft 1 and a second transmission shaft 3. The first transmission shaft 1 and the second transmission shaft 3 can adopt existing transmission methods, such as a screw and nut configuration. For example, the lateral degree of freedom is achieved by moving the drive assembly 2 along the first drive shaft 1, and the longitudinal degree of freedom is achieved by using the drive assembly to drive the second transmission shaft 3 to rotate, and the transmission nut drives the fixed transmission seat 6 to move along the second drive shaft 3.

[0024] In this transmission method, more specifically, the minimum length of the nozzle branch pipe 42 should be greater than the lateral distance between the drive assembly 2, the drive shaft 3, the drive nut, and the fixed drive seat 6, to ensure that the nozzle 43 is outside the projection of the fixed and transmission structure that drives its movement on the tube sheet surface. Thus, when the cleaning equipment 4 runs to the heat exchange tubes at both ends of the tube sheet surface for cleaning, the relevant structures will not interfere with the water chamber, ensuring the reachability of the nozzle to clean the heat exchange tubes at both ends of the tube sheet surface.

[0025] Furthermore, the movement of the cleaning equipment 4 can be driven by either a single degree of freedom with only the first drive shaft 1, or by two degrees of freedom with both the first drive shaft 1 and the second drive shaft 3.

[0026] Furthermore, in a transmission scheme with only one degree of freedom of the first drive shaft 1, the nozzle branch pipe 42 needs to be arranged row by row to correspond to the heat exchange pipes to ensure that each row can be cleaned.

[0027] Furthermore, in the two-degree-of-freedom transmission scheme with both the first transmission shaft 1 and the second transmission shaft 3, the nozzle branch pipe 42 can be arranged equally according to the number of heat exchange tube rows, reducing the number of nozzle branch pipes 42. This allows for a larger single-pipe cleaning flow rate under the same cleaning water source conditions. The larger single-pipe cleaning flow rate enables the deep part of the heat exchange tube to be covered and cleaned by cleaning water with a certain cleaning capacity, thereby improving the cleaning coverage rate in the depth direction of the heat exchange tube.

[0028] This invention also discloses the cleaning logic of the above-mentioned condenser heat exchanger tube full-coverage cleaning equipment. The specific cleaning logic is as follows: In a single-degree-of-freedom transmission scheme with only the first drive shaft 1, in conjunction with the corresponding nozzle branch pipe 42 arrangement scheme, the cleaning of all heat exchanger tubes on the entire tube sheet surface can be completed by simply moving laterally back and forth; In a two-degree-of-freedom transmission scheme with both the first drive shaft 1 and the second drive shaft 3, when the total number of heat exchanger tube rows is a, assuming that m nozzle branch pipes 42 are designed in m equal parts, a=m·n, then after each lateral movement to clean the entire row, it is necessary to move vertically by one heat exchanger tube row spacing to clean the next row, and a total of n heat exchanger tube row spacings need to be moved vertically.

[0029] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be considered within the scope of protection of the present invention.

Claims

1. A condenser heat exchanger tube full-coverage cleaning device, characterized in that, It includes a main water pipe, nozzle branch pipes, and nozzles; the nozzle branch pipes are freely movable on the tube sheet surface via a transmission mechanism; the nozzles are located at both ends of the nozzle branch pipes; the cleaning water flows through the main water pipe into the nozzle branch pipes and is sprayed out by the nozzles; the length of the nozzle branch pipes satisfies the following condition: when the transmission mechanism moves to its left or right travel edge on the tube sheet surface, the projection of the nozzle at the corresponding end on the tube sheet surface is outside the projection of the transmission mechanism on the tube sheet surface; the length of the nozzles is designed according to the distance from the main water pipe inlet: the farther the distance from the main water pipe inlet, the shorter the nozzle length.

2. The condenser heat exchanger tube full-coverage cleaning equipment according to claim 1, characterized in that, The nozzles are divided into multiple sections, arranged in a row corresponding to the heat exchange tubes, and fixedly mounted on a fixed transmission base. The fixed transmission base is mounted on the tube sheet surface and can be moved left and right through a transmission mechanism. The projection of the nozzles on the tube sheet surface is outside the projection of the fixed transmission base on the tube sheet surface.

3. The condenser heat exchanger tube full-coverage cleaning equipment according to claim 1, characterized in that, The nozzles are divided into multiple sections, arranged equally according to the number of rows of heat exchange tubes, and fixedly mounted on a fixed transmission base; the transmission mechanism includes a first transmission shaft and a second transmission shaft; the fixed transmission base is mounted on the second transmission shaft and can be moved up and down via a drive assembly, and the drive assembly is mounted on the first transmission shaft and can be moved left and right; the projection of the nozzles on the tube sheet surface is outside the projections of the fixed transmission base and the second transmission shaft on the tube sheet surface.

4. The condenser heat exchanger tube full-coverage cleaning equipment according to claim 1, characterized in that, The formula for calculating the length of the nozzle is as follows: ， C is a constant. ; in, This refers to the nozzle length, in meters (m). The Darcy friction factor for the main water pipe is n, and the number of nozzles is n. The nozzle diameter is expressed in meters (m). The nozzle's cross-sectional area is expressed in meters (m²). 2 ; The Darcy friction factor of the nozzle; The hydraulic pressure of the main water pipe is measured in meters (m). The cross-sectional area of ​​the main water pipe, in meters. 2 ; d is the distance from the nozzle to the main water pipe inlet, in meters; Water supply pressure, in Pa; Fluid density, in kg / m³ 3 ; The uniform flow rate of the nozzle, in m³ / s. 3 / s; The local loss coefficient at the main water pipe inlet. This is the local loss coefficient at the nozzle inlet.

5. The method for full-coverage cleaning of condenser heat exchanger tubes using the condenser heat exchanger tube full-coverage cleaning equipment according to claim 2, characterized in that, When cleaning the heat exchange tubes, the fixed transmission seat can be moved back and forth horizontally to clean all the heat exchange tubes on the entire tube sheet.

6. The method for full-coverage cleaning of condenser heat exchanger tubes using the condenser heat exchanger tube full-coverage cleaning equipment according to claim 3, characterized in that, When the total number of heat exchange tubes is a, and m nozzles are designed to divide the tubes into m equal parts, a = m·n, then after each horizontal movement to clean the entire row, it is necessary to move vertically by one heat exchange tube row spacing to clean the next row. A total of n heat exchange tube row spacings need to be moved vertically to complete the cleaning of all heat exchange tubes on the entire tube sheet.

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