Device for cleaning heat exchange tube on line by using micro-nano bubbles

Abstract

The utility model discloses a device for cleaning a heat exchange tube on line by using micro-nano bubbles, and belongs to the field of heat exchangers. Comprising a micro-nano bubble generator, the micro-nano bubble generator is provided with a water inlet, an air inlet and an outlet, the water inlet of the micro-nano bubble generator is connected with a circulating water pump through a pipeline, a check valve and an isolating valve are arranged on the pipeline, and the micro-nano bubble generator further comprises an air source and a Venturi tube which are connected through a pipeline. The outlet end of the Venturi tube is connected with an air inlet of the micro-nano bubble generator through a pipeline, and an outlet of the micro-nano bubble generator is connected with the heat exchanger through a pipeline. According to the utility model, the heat exchanger can be continuously and effectively cleaned, so that the loss caused by shutdown cleaning is avoided.

Description

Technical Field

[0001] This utility model relates to the field of heat exchangers, and more particularly to a device for online cleaning of heat exchange tubes using micro-nano bubbles. Background Technology

[0002] Heat exchangers are commonly used in various industrial settings, such as power plants, gas turbines, heating systems, refrigeration systems, chemical plants, and various air conditioning systems. Heat exchangers include cylindrical shell-and-tube heat exchangers, finned-tube heat exchangers, and plate heat exchangers. Inside the heat exchange tubes, components dissolved in tap water or groundwater, such as calcium carbonate, magnesium carbonate, calcium hydroxide, and magnesium hydroxide, adhere as scale.

[0003] Scale buildup on pipes can reduce the heat exchanger's efficiency, narrow the flow path, decrease flow rate, and increase pump pressure and power consumption. Therefore, it is necessary to remove the scale.

[0004] To remove this scale, the heat exchanger tubes need to be disassembled for cleaning, or the heat exchanger needs to be stopped and cleaning fluid injected into it needs to be performed. However, a drawback of disassembling the heat exchanger or injecting cleaning fluid is that operation is interrupted during the cleaning process. Furthermore, in the case of welded heat exchangers, disassembly is not possible, leading to maintenance difficulties.

[0005] Plate heat exchangers, in particular, offer high heat exchange efficiency and economic benefits. Heat exchange occurs through the flow of water from the upper and lower parts of a heat exchanger where cold and hot water plates are continuously arranged. The gaps between the heat exchange plates are approximately 3 mm or less, resulting in very small voids and making scale removal extremely difficult when the plate is installed.

[0006] When scale forms in such heat exchangers, not only does energy efficiency decrease, but the performance of the device deteriorates, leading to economic losses and reduced industrial productivity. Therefore, it is necessary to remove and inhibit scale buildup. Traditional methods of scale removal involve disassembling the heat exchanger and washing each heat exchanger plate with high-pressure water, or using cleaning agents to remove scale, followed by reassembly. This process is time-consuming, and improper use of chemical cleaning agents can result in ineffective scale removal and lead to heat exchanger corrosion.

[0007] Another offline cleaning method is a physical cleaning of heat exchange tubes. In this method, a nozzle is installed at one end of the heat exchanger tube, and an airflow containing abrasive particles is sprayed through the tube. A nozzle with a small or equal size is used. However, the abrasive particles can easily cause erosion inside the heat exchange tubes, damaging them.

[0008] As a solution to this problem, caustic soda can also be used to remove scale inside the heat exchanger. This chemical is mixed with circulating water, which is then passed through the heat exchanger. A neutralization process is performed to remove the scale, and the circulating water mixed with the chemical is then drained until the chemical is completely consumed. However, since this method is also a chemical cleaning method, it is not only harmful to human health but also poses a risk of secondary environmental problems due to the need to use a powerful cleaning solution.

[0009] All of these offline cleaning methods have a drawback: scale will re-accumulate after cleaning as the operating time increases, requiring repeated operations on the heat exchanger, resulting in significant downtime economic losses. Summary of the Invention

[0010] The purpose of this invention is to provide a device for online cleaning of heat exchange tubes using micro-nano bubbles, so as to solve the above-mentioned problems.

[0011] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a device for online cleaning of heat exchange tubes using micro-nano bubbles, comprising a micro-nano bubble generator, wherein the micro-nano bubble generator is provided with a water inlet, an air inlet, and an outlet, wherein the water inlet of the micro-nano bubble generator is connected to a circulating water pump through a pipe, and a check valve and an isolation valve are provided on the pipe, and further comprising an air source and a venturi tube connected through a pipe, wherein the outlet end of the venturi tube is connected to the air inlet of the micro-nano bubble generator through a pipe, and the outlet of the micro-nano bubble generator is connected to a heat exchanger through a pipe.

[0012] This invention can utilize micro-nano bubbles to suppress and clean scaling of the heat exchange medium in tubular and non-cleanable irregular heat exchangers (plate, spiral, U-shaped, etc.).

[0013] The gas source draws in or supplies gases such as air, oxygen, and carbon dioxide; the check valve is a balancing valve used to control and balance the flow of the heat exchange medium branch pipe and to prevent cooling water backflow due to abnormal pressure in the connecting pipe.

[0014] As a preferred technical solution, it also includes a sterilization substance gas source, which is connected to the inlet of a venturi tube.

[0015] By setting up a sterilization substance (such as iodine) gas source, entering the Venturi tube, and then entering the micro-nano bubble generator, and preferably mixing the generated micro-nano bubbles into the heat exchanger, the gaseous substances of algae and other biological attachments can be suppressed and killed, effectively inhibiting the generation of biological attachments.

[0016] As a preferred technical solution, a gas flow regulating valve is provided on the pipe connecting the micro-nano bubble generator and the venturi tube, and a combined isolation / balancing valve B is provided on the pipe connecting the micro-nano bubble generator and the heat exchanger.

[0017] As a preferred technical solution, the circulating water pump is also connected to the heat exchanger via a pipeline, and a combined isolation / balancing valve A is installed on the pipeline.

[0018] As a preferred technical solution, a control unit is also included, which is electrically connected to the combined isolation / balancing valve A, the isolation valve, the combined isolation / balancing valve B, and the gas flow regulating valve, respectively.

[0019] By setting up a control unit, the opening and closing of the aforementioned valves and the flow rate can be automatically controlled. As will be understood by those skilled in the art, the aforementioned valve control unit and control method are common knowledge in the field.

[0020] As a preferred technical solution, a filter is also provided between the isolation valve and the micro / nano bubble generator. This filter can remove larger dirt crystals or bioflocs from the heat exchange medium before the circulating water enters the micro / nano bubbles.

[0021] Compared with the prior art, the advantages of this utility model are: by injecting micro-nano bubbles into the heat exchanger to remove and inhibit chemical and physical deposits, and forming surface nano bubbles on the heat exchange surface to prevent the re-formation of scale on the heat exchange medium; at the same time, the micro-nano bubbles can contain gaseous substances that inhibit and kill algae and other biological attachments, which can effectively inhibit the generation of biological attachments, achieve continuous and effective cleaning, and avoid the losses caused by downtime for cleaning. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the device structure of this utility model;

[0023] In the diagram: 10. Circulating water pump; 11. Check valve; 12. Combined isolation / balancing valve A; 13. Isolation valve; 14. Filter; 15. Micro / nano bubble generator; 16. Combined isolation / balancing valve B; 17. Heat exchanger; 30. Gas source; 31. Venturi tube; 32. Gas flow regulating valve; 40. Sterilization material gas source; 50. Control unit. Detailed Implementation

[0024] The present invention will be further described below with reference to the embodiments.

[0025] Example:

[0026] See Figure 1An apparatus for online cleaning of heat exchange tubes using micro-nano bubbles includes a micro-nano bubble generator 15, which is provided with a water inlet, an air inlet, and an outlet. The water inlet of the micro-nano bubble generator 15 is connected to a circulating water pump 10 through a pipe. A check valve 11 and an isolation valve 13 are provided on the pipe. The apparatus also includes an air source 30 and a venturi tube 31 connected through a pipe. The outlet end of the venturi tube 31 is connected to the air inlet of the micro-nano bubble generator 15 through a pipe. The outlet of the micro-nano bubble generator 15 is connected to a heat exchanger 17 through a pipe.

[0027] In this embodiment, a sterilization gas source 40 is also included, which is connected to the inlet of the venturi tube 31.

[0028] A gas flow regulating valve 32 is provided on the pipe connecting the micro-nano bubble generator 15 and the venturi tube 31, and a combined isolation / balancing valve B16 is provided on the pipe connecting the micro-nano bubble generator 15 and the heat exchanger 17; the circulating water pump 10 is also connected to the heat exchanger 17 through a pipe, and a combined isolation / balancing valve A12 is provided on the pipe.

[0029] It also includes a control unit 50, which is electrically connected to the combined isolation / balancing valve A 12, the isolation valve 13, the combined isolation / balancing valve B16 and the gas flow regulating valve 32 respectively;

[0030] By setting up the control unit 50, automatic control of the opening and closing of the valve and the flow rate can be achieved. As will be understood by those skilled in the art, the aforementioned valve control unit and control method are common knowledge in the field.

[0031] A filter 14 is also provided between the isolation valve 13 and the micro / nano bubble generator 15;

[0032] In operation, the circulating water pump 10 supplies circulating water, which is divided into two branches. One branch provides water by generating micro-nano bubbles for the micro-nano bubble generator 15, while the other branch provides heat exchange medium for the heat exchanger. Gas supplied by the gas source 30 enters the micro-nano bubble generator 15 through the venturi tube 31, providing the gas source. The micro-nano bubbles generated by the micro-nano bubble generator 15 then enter the heat exchanger for online cleaning. Valves on each pipeline control the flow rate of the water and gas paths via the control unit 50, ensuring the operation of the entire system.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for online cleaning of heat exchange tubes using micro / nano bubbles, characterized in that, The device includes a micro / nano bubble generator, which has a water inlet, an air inlet, and an outlet. The water inlet of the micro / nano bubble generator is connected to a circulating water pump via a pipe. A check valve and an isolation valve are installed on the pipe. The device also includes an air source and a venturi tube connected via a pipe. The outlet end of the venturi tube is connected to the air inlet of the micro / nano bubble generator via a pipe. The outlet of the micro / nano bubble generator is connected to a heat exchanger via a pipe.

2. The device for online cleaning of heat exchange tubes using micro / nano bubbles according to claim 1, characterized in that, It also includes a sterilizing gas source, which is connected to the inlet of a venturi tube.

3. The device for online cleaning of heat exchange tubes using micro / nano bubbles according to claim 1, characterized in that, A gas flow regulating valve is installed on the pipe connecting the micro-nano bubble generator and the venturi tube, and a combined isolation / balancing valve B is installed on the pipe connecting the micro-nano bubble generator and the heat exchanger.

4. The device for online cleaning of heat exchange tubes using micro / nano bubbles according to claim 3, characterized in that, The circulating water pump is also connected to the heat exchanger via a pipe, and a combined isolation / balancing valve A is installed on the pipe.

5. The device for online cleaning of heat exchange tubes using micro / nano bubbles according to claim 4, characterized in that, It also includes a control unit, which is electrically connected to the combined isolation / balancing valve A, the isolation valve, the combined isolation / balancing valve B, and the gas flow regulating valve, respectively.

6. The device for online cleaning of heat exchange tubes using micro / nano bubbles according to claim 1, characterized in that, A filter is also provided between the isolation valve and the micro / nano bubble generator.

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