Through-flow performance detection device

Abstract

The utility model discloses a through-flow performance detection device which can be used for automatically detecting the through-flow performance of a fan-shaped heat storage piece, so that the blockage condition of an air preheater is detected, and manual detection is avoided. The through-flow performance detection device comprises a light source (21) and a light signal receiving and processing assembly. The light source (21) is arranged on one side of the mode heat exchanger and used for emitting light signals to the fan-shaped heat storage piece (10) so that the light signals can be transmitted in the ventilation holes of the fan-shaped heat storage piece (10). The optical signal receiving and processing assembly is arranged on the side, opposite to the light source (21), of the mode heat exchanger, directly faces the light source (21) and is used for detecting the intensity of an optical signal penetrating through the fan-shaped heat storage part (10), comparing the intensity of the optical signal with preset conduction optical signal intensity and calculating to obtain the through-flow performance of the fan-shaped heat storage part (10). And obtaining the through-flow performance of the mode heat exchanger.

Description

Technical Field

[0001] This utility model belongs to the field of air preheater testing technology, specifically relating to a flow performance testing device. Background Technology

[0002] At the boiler tail end of a thermal power plant, the air preheater serves as a crucial heat exchange element. It reduces heat loss by decreasing the heat of the flue gas and heats the primary and secondary air required for combustion, thereby improving combustion efficiency. Therefore, the efficient operation of the air preheater is essential for ensuring the safe and stable operation of thermal power units.

[0003] However, during long-term operation of the unit, problems such as ammonium bisulfate carried in the flue gas, poor quality of soot blowing steam from the air preheater, and low-temperature corrosion can easily lead to blockage of the air preheater. This can cause air leakage and increased resistance in the air preheater, resulting in insufficient boiler air supply, increased load on the boiler induced draft fan, reduced furnace negative pressure, and reduced boiler load-carrying capacity, thus affecting the safe and stable operation of the unit equipment. Therefore, it is necessary to frequently check the blockage of the air preheater.

[0004] The air preheater is a large device, consisting of multiple fan-shaped heat storage components. Because there is a lack of equipment to detect blockages in the air preheater, the current method of manually checking the blockage of the ventilation holes in each fan-shaped heat storage component is the only option. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the above-mentioned shortcomings of the existing technology by providing a flow performance testing device. By using the flow performance testing device, the flow performance of the fan-shaped heat storage component can be automatically detected, thereby detecting the blockage of the air preheater and avoiding manual testing.

[0006] In a first aspect, this utility model provides a flow performance testing device for a rotary air preheater. The rotary air preheater includes a model heat exchanger capable of rotating around its axis. The model heat exchanger includes multiple fan-shaped heat storage elements distributed around its axis, each of which has a ventilation hole extending along the axial direction of the model heat exchanger. The flow performance testing device includes a light source and a light signal receiving and processing component. The light source is disposed on one side of the model heat exchanger and is used to emit light signals to the fan-shaped heat storage elements, enabling the light signals to transmit within the ventilation holes of the fan-shaped heat storage elements. The light signal receiving and processing component is disposed on the side of the model heat exchanger opposite to the light source and directly facing the light source. It is used to detect the intensity of the light signal passing through the fan-shaped heat storage elements, and calculates the flow performance of the fan-shaped heat storage elements by comparing the intensity of the light signal with a preset conductive light signal intensity, thereby obtaining the flow performance of the model heat exchanger.

[0007] In some embodiments, the optical signal receiving and processing component includes an optical signal receiving board and a signal processor. The optical signal receiving board is disposed on the side of the mode heat exchanger opposite to the light source and directly facing the light source. It is used to receive the optical signal emitted by the light source that passes through the fan-shaped heat storage element, and to convert the received optical signal into an electrical signal. The signal processor is electrically connected to the optical signal receiving board and is used to obtain the intensity of the optical signal based on the electrical signal, and to calculate the current-carrying capacity of the fan-shaped heat storage element by comparing the intensity of the optical signal with the intensity of the conductive optical signal.

[0008] In some embodiments, the light source is fan-shaped, and the shape of the light source is adapted to the shape and size of the fan-shaped heat storage element. The optical signal receiving board is fan-shaped, and the shape of the optical signal receiving board is adapted to the shape and size of the fan-shaped heat storage element.

[0009] In some embodiments, the minimum distance between the light source and the fan-shaped heat storage element is L1, where 10mm ≤ L1 ≤ 50mm. The minimum distance between the optical signal receiving board and the fan-shaped heat storage element is L2, where 10mm ≤ L2 ≤ 50mm.

[0010] In some embodiments, each of the fan-shaped heat storage components has a plurality of ventilation holes; the plurality of ventilation holes are arranged in M ​​rows along the circumference of the model heat exchanger and in N columns along the radial direction of the model heat exchanger, where M and N are both positive integers. The optical signal receiving board is provided with a plurality of photodiodes, the number and position of which are the same as the number and position of the plurality of ventilation holes. Each photodiode is electrically connected to the signal processor and is used to receive the optical signal emitted by the light source that passes through the fan-shaped heat storage component, and to convert the received optical signal into an electrical signal.

[0011] In some embodiments, the light source includes a light plate and a plurality of strip-shaped light-emitting devices disposed on the light plate. Each of the strip-shaped light-emitting devices extends radially along the mode heat exchanger, and the number and position of the plurality of strip-shaped light-emitting devices are the same as the number and position of the plurality of ventilation holes.

[0012] In some embodiments, the optical signal receiving board has a grid structure, wherein the number and position of the multiple grids in the grid structure are the same as the number and position of the multiple ventilation holes. Multiple photodiodes are arranged in a one-to-one correspondence with the multiple grids, and each photodiode is located at the vertex of its corresponding grid.

[0013] In some embodiments, the optical signal receiving and processing component further includes a display. The signal processor is also electrically connected to the display and is configured to, after obtaining the current-carrying performance of each of the sector-shaped heat storage elements, convert the current-carrying performance of the corresponding sector-shaped heat storage element into a display signal and transmit it to the display, so that the display displays the current-carrying performance of each of the sector-shaped heat storage elements.

[0014] In some embodiments, the optical signal receiving board is used to convert the received optical signal into a current signal. A current-to-voltage converter and a data acquisition unit are further disposed between the optical signal receiving board and the signal processor, with the optical signal receiving board electrically connected to the signal processor sequentially via the current-to-voltage converter and the data acquisition unit. The current-to-voltage converter is used to convert the current signal converted by the optical signal receiving board into a voltage signal, and the data acquisition unit is used to convert the voltage signal into a digital signal and transmit it to the signal processor. The signal processor is used to obtain the intensity of the optical signal based on the digital signal.

[0015] In some embodiments, the current-carrying performance testing device further includes a power supply and a DC-DC converter. The power supply is electrically connected to the light source and is used to provide a first operating power supply to the light source. The DC-DC converter is electrically connected to both the current-to-voltage converter and the power supply, and is used to adjust the power provided by the power supply before supplying it to the current-to-voltage converter to provide a second operating power supply for the current-to-voltage converter.

[0016] Therefore, the flow performance testing device provided in this embodiment of the present invention can emit light signals to the fan-shaped heat storage element by setting a light source on one side of the model heat exchanger, so that the light signals can be transmitted in the ventilation holes of the fan-shaped heat storage element. By placing a light signal receiving and processing component on the side of the model heat exchanger opposite to the light source, and positioning the component directly opposite the light source, the intensity of the light signal emitted by the light source passing through the fan-shaped heat storage element can be detected. Since the flow performance of the fan-shaped heat storage element varies, the degree of obstruction of the light signal emitted by the light source differs, resulting in varying intensities of the light signal reaching the light signal receiving and processing component after passing through the element. Consequently, the ratio of the intensity of the light signal received by the component to the preset conduction light signal intensity also varies. By comparing and calculating the intensity of the received light signal with the preset conduction light signal intensity, the flow performance of the fan-shaped heat storage element can be obtained. This allows for the determination of the flow performance of each individual fan-shaped heat storage element, and thus the overall flow performance of the model heat exchanger. Furthermore, the blockage status of the model heat exchanger can be deduced from the overall flow performance, enabling automatic detection of blockage in the model heat exchanger. Furthermore, the optical signal receiving and processing components can automatically compare and calculate the flow performance of the fan-shaped heat storage component to quickly obtain the flow performance of the fan-shaped heat storage component. Compared with the manual inspection in the prior art, this helps to reduce the detection time of air preheater blockage. Attached Figure Description

[0017] Figure 1 : A structural diagram of a flow performance testing device provided in an embodiment of this utility model;

[0018] Figure 2 : A structural diagram of a rotary air preheater provided in an embodiment of this utility model;

[0019] Figure 3 : A structural diagram of a model heat exchanger provided in an embodiment of this utility model;

[0020] Figure 4 : A structural diagram of a fan-shaped heat storage component provided in an embodiment of this utility model;

[0021] Figure 5 : A structural diagram of an optical signal receiving board provided in an embodiment of this utility model;

[0022] Figure 6 : A structural diagram of a light source provided in an embodiment of this utility model. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] Example 1:

[0025] like Figure 1 As shown in the figure, this utility model embodiment provides a flow performance testing device, which is applied during the maintenance of a rotary air preheater to detect the blockage of the rotary air preheater.

[0026] like Figure 2 and Figure 3 As shown, Figure 2 This is a structural diagram of a rotary air preheater. Figure 3 This is a structural diagram of a rotary air preheater. The rotary air preheater includes: a hot-end primary air connecting flange 1, a hot-end primary air truss 2, a hot-end inner connecting ring 3, a sealing angle steel 4, a radial sealing plate 5, a grid 6, a rotor drive device 7, a guide bearing device 8, a hot-end central truss 9, a rotary air preheater (including multiple fan-shaped heat storage components 10), a primary air support frame 11, a main support frame and axial sealing plate 12, a cold-end central truss 13, a rotor housing guard plate 14, a hot-end outer connecting ring 15, a cold-end connecting ring 16, corner assemblies 17, sliding pads 18, side support frames 19, and a side support frame guard plate 20.

[0027] Combination Figure 3 and Figure 4 The model heat exchanger is capable of rotating around its axis. In the model heat exchanger, multiple sector-shaped heat storage elements 10 are distributed around the axis of the model heat exchanger, and each sector-shaped heat storage element 10 is provided with a ventilation hole 10A extending along the axis of the model heat exchanger.

[0028] When air passes through the ventilation hole 10A, it can exchange heat with the fan-shaped heat storage element 10 (absorb or release heat) and temporarily store the heat on the fan-shaped heat storage element 10. After the heat moves to the target position with the fan-shaped heat storage element 10, it exchanges heat with the air at the target position again (release or absorb heat).

[0029] For example, such as Figure 4 As shown, each fan-shaped heat storage element 10 has multiple ventilation holes 10A to increase the ventilation volume of the fan-shaped heat storage element 10 and enable the fan-shaped heat storage element 10 to exchange heat with the air better.

[0030] The working principle of a rotary air preheater is as follows: During operation, the mode heat exchanger rotates clockwise around its axis, thereby driving multiple fan-shaped heat storage elements 10 to rotate around the axis of the mode heat exchanger. For example... Figure 2 As shown, high-temperature (e.g., 340°C) flue gas along Figure 2 The A1 direction passes through the model heat exchanger from top to bottom, thereby heating a portion of the fan-shaped heat storage element 10 within the model heat exchanger. After heating, the fan-shaped heat storage element 10 rotates to the primary air inlet area, and the primary air flows along... Figure 2The primary air passes through the heat exchanger from bottom to top along direction A2, and the heated fan-shaped heat storage element 10 can heat the primary air (e.g., to 170°C). Afterward, the heated fan-shaped heat storage element 10 continues to rotate to the secondary air inlet area, and the secondary air flows along... Figure 2 The A3 direction passes through the mode heat exchanger from bottom to top, and the heated fan-shaped heat storage element 10 can continue to heat the secondary air (e.g., to 140°C). After heating the primary and secondary air, the temperature of the heated fan-shaped heat storage element 10 decreases, and it continues to rotate to the high-temperature flue gas inlet area. The high-temperature flue gas flows along... Figure 2 The A1 direction passes through the mode heat exchanger from top to bottom, reheating the fan-shaped heat storage element 10, and continues to circulate, so that the mode heat exchanger continuously heats the primary and secondary air.

[0031] like Figure 1 As shown, the flow performance testing device includes a light source 21 and a light signal receiving and processing component. The light source 21 is positioned on one side of the model heat exchanger and is used to emit light signals into the fan-shaped heat storage element 10, enabling the light signals to transmit within the ventilation holes 10A of the fan-shaped heat storage element 10. The light signal receiving and processing component is positioned on the side of the model heat exchanger opposite to the light source 21 and directly facing it. It is used to detect the intensity of the light signal passing through the fan-shaped heat storage element 10, and calculates the flow performance of the fan-shaped heat storage element 10 by comparing the intensity of the light signal with a preset conductive light signal intensity, thereby obtaining the flow performance of the model heat exchanger.

[0032] For example, the light source 21 can be a fluorescent lamp, an LED lamp, etc. The intensity of the light signal emitted by the light source 21 is sufficient to ensure that the light signal can be detected by the light signal receiving and processing component after passing through the fan-shaped heat storage element 10.

[0033] For example, the light source 21 is positioned above the model heat exchanger (e.g., at the top of the hot end of a rotary air preheater), and the optical signal receiving and processing component is positioned below the model heat exchanger (e.g., at the bottom of the cold end of a rotary air preheater). The optical signal emitted by the light source 21 passes from top to bottom through the ventilation hole 10A of the fan-shaped heat storage element 10 and is then directed towards the optical signal receiving and processing component.

[0034] For example, the preset conduction optical signal intensity is the intensity of the optical signal passing through the fan-shaped heat storage element 10 when the fan-shaped heat storage element 10 is fully turned on.

[0035] For example, the flow performance of the fan-shaped heat storage element 10 can be a percentage of the ratio of the actual flow area of ​​the fan-shaped heat storage element 10 to the flow area when it is not blocked.

[0036] Understandably, the different flow performance of the fan-shaped heat storage element 10 results in different levels of obstruction of the light signal emitted by the light source 21, which in turn leads to different intensities of the light signal received by the light signal receiving and processing components.

[0037] For example, when the fan-shaped heat storage element 10 is not blocked, the flow performance of the fan-shaped heat storage element 10 is good (flow performance is 100%), the ventilation hole 10A in the fan-shaped heat storage element 10 does not obstruct the light signal emitted by the light source 21, and the light signal can pass through the fan-shaped heat storage element 10 and be emitted to the light signal receiving and processing component. The intensity of the light signal received by the light signal receiving and processing component is the strongest, which is equal to the preset conduction light signal intensity mentioned above.

[0038] For example, when the fan-shaped heat storage element 10 is partially blocked, for example, the blockage degree is 40%, then the actual flow area of ​​the fan-shaped heat storage element 10 becomes 60% of the flow area of ​​the fan-shaped heat storage element 10 when it is not blocked (the flow performance is 60%). The flow performance of the fan-shaped heat storage element 10 will decrease. The blocking material in the ventilation hole 10A in the fan-shaped heat storage element 10 will block the light signal emitted by the light source 21 to a certain extent. Of all the light signals emitted by the light source 21, only 60% can pass through the fan-shaped heat storage element 10 and reach the light signal receiving and processing component. The intensity of the light signal received by the light signal receiving and processing component will also weaken accordingly, becoming 60% of the preset conduction light signal intensity.

[0039] For example, when the fan-shaped heat storage element 10 is completely blocked, the current carrying capacity of the fan-shaped heat storage element 10 is 0, the light signal emitted by the light source 21 cannot pass through the fan-shaped heat storage element 10 at all, and the intensity of the light signal received by the light signal receiving and processing component is 0.

[0040] As can be seen from the above examples, the ratio between the intensity of the optical signal received by the optical signal receiving and processing component and the preset intensity of the conductive optical signal is equal to the current-carrying performance value of the fan-shaped heat storage element 10. By calculating the ratio between the intensity of the optical signal received by the optical signal receiving and processing component and the preset intensity of the conductive optical signal, the current-carrying performance value of the fan-shaped heat storage element 10 can be obtained.

[0041] Therefore, the process by which the optical signal receiving and processing components compare the intensity of the optical signal with the preset conduction optical signal intensity to calculate the current-carrying performance of the fan-shaped heat storage element 10 can be exemplified as follows:

[0042] For example, if the intensity of the conductive optical signal is 10000 Lux, and the intensity of the optical signal detected by the optical signal receiving and processing component passing through a fan-shaped heat storage element 10 is 3000 Lux, then the current carrying capacity of the fan-shaped heat storage element 10 is: 3000 Lux ÷ 10000 Lux = 30%.

[0043] Therefore, the optical signal receiving and processing component can calculate the comparison result (i.e., the percentage relationship mentioned above) between the intensity of the detected optical signal and the preset conduction optical signal intensity by detecting the intensity of the optical signal passing through the fan-shaped heat storage element 10. This allows the flow performance of the fan-shaped heat storage element 10 to be obtained. After obtaining the flow performance of each fan-shaped heat storage element 10 in sequence, the flow performance of the entire model heat exchanger can be obtained. Based on the flow performance of the model heat exchanger, the blockage status of the model heat exchanger can also be deduced, enabling the detection of blockage status of the model heat exchanger. This provides reliable data for staff to use as a reference, which is beneficial for staff to find the location and degree of blockage in the rotary air preheater on-site in a timely manner and to handle it, thereby ensuring the maintenance quality of the rotary air preheater and improving its operating efficiency.

[0044] Furthermore, the optical signal receiving and processing components can automatically compare and calculate the flow performance of the fan-shaped heat storage element 10 to quickly obtain the flow performance of the fan-shaped heat storage element 10, which helps to reduce the detection time of blockage in the air preheater.

[0045] Therefore, the flow performance testing device provided in this embodiment of the present invention can emit light signals to the fan-shaped heat storage element 10 by setting a light source 21 on one side of the mode heat exchanger, so that the light signals can be transmitted in the ventilation hole 10A of the fan-shaped heat storage element 10. By setting a light signal receiving and processing component on the side of the model heat exchanger opposite to the light source 21, and making the light signal receiving and processing component face the light source 21, the intensity of the light signal emitted by the light source 21 passing through the fan-shaped heat storage element 10 can be detected. Since the flow performance of the fan-shaped heat storage element 10 is different, the degree of obstruction of the light signal emitted by the light source 21 is different, and the intensity of the light signal that passes through the fan-shaped heat storage element 10 and is emitted to the light signal receiving and processing component is also different. Therefore, the ratio of the intensity of the light signal received by the light signal receiving and processing component to the preset conduction light signal intensity is also different. By having the light signal receiving and processing component compare and calculate the intensity of the received light signal with the preset conduction light signal intensity, the flow performance of the fan-shaped heat storage element 10 can be obtained. Thus, the flow performance of each fan-shaped heat storage element 10 can be obtained, and the overall flow performance of the model heat exchanger can be obtained. Based on the overall flow performance of the model heat exchanger, the blockage status of the model heat exchanger can be deduced, thereby realizing the detection of the blockage status of the model heat exchanger. Furthermore, the optical signal receiving and processing components can automatically compare and calculate the flow performance of the fan-shaped heat storage element 10 to quickly obtain the flow performance of the fan-shaped heat storage element 10. Compared with the manual inspection in the prior art, this helps to reduce the detection time of air preheater blockage.

[0046] In some embodiments, such as Figure 1As shown, the optical signal receiving and processing component includes an optical signal receiving board 22 and a signal processor. The optical signal receiving board 22 is positioned on the side of the mode heat exchanger opposite to the light source 21 and directly facing the light source 21. It receives the optical signal emitted by the light source 21 that passes through the fan-shaped heat storage element 10 and converts the received optical signal into an electrical signal. The signal processor is electrically connected to the optical signal receiving board 22 and is used to obtain the intensity of the optical signal based on the electrical signal. It then compares the intensity of the optical signal with the intensity of the conductive optical signal to calculate the current-carrying capacity of the fan-shaped heat storage element 10.

[0047] For example, the optical signal receiving board 22 is provided with a photoelectric conversion element for converting the optical signal into a corresponding electrical signal.

[0048] It is understandable that the greater the intensity of the optical signal, the greater the intensity of the corresponding electrical signal after conversion.

[0049] For example, the optical signal receiving board 22 is connected to the signal processor via a data cable, and the electrical signal is transmitted to the signal processor via the data cable.

[0050] For example, the signal processor includes a microprocessor that is capable of comparing and calculating input data and obtaining calculation results.

[0051] For example, such as Figure 1 As shown, the signal processor is a computer 28, and the computer 28 runs corresponding data acquisition software 29. The electrical signal converted by the optical signal receiving board 22 is transmitted to the computer, and the data acquisition software 29 compares and processes the received electrical signal to obtain the current carrying capacity of the fan-shaped heat storage element 10.

[0052] The above settings facilitate the on-site installation of the optical signal receiver board 22 and allow for flexible configuration of the signal processor's location.

[0053] In some embodiments, such as Figure 1 As shown, the light source 21 is fan-shaped, and its shape and size are adapted to the fan-shaped heat storage component 10. The optical signal receiving board 22 is also fan-shaped, and its shape and size are adapted to the fan-shaped heat storage component 10.

[0054] With the above configuration, the light source 21 can completely cover the fan-shaped heat storage component 10, allowing the light signal emitted by the light source 21 to be directed towards all the ventilation holes 10A of the fan-shaped heat storage component 10. Furthermore, the shape of the light signal receiving plate 22 can completely cover the fan-shaped heat storage component 10, enabling the light signal receiving plate 22 to completely receive the light signal emitted from each ventilation hole 10A. Therefore, the blockage status of each ventilation hole 10A can affect the intensity of the light signal ultimately received by the light signal receiving plate 22. Ultimately, the intensity of the light signal received by the light signal receiving plate 22 can reflect the blockage status of all ventilation holes 10A in the fan-shaped heat storage component 10, improving the accuracy of the final flow performance of the fan-shaped heat storage component 10.

[0055] In some embodiments, the minimum distance between the light source 21 and the fan-shaped heat storage element 10 is L1, where 10mm≤L1≤50mm.

[0056] For example, L1 can be 10mm, 30mm or 50mm, etc.

[0057] With the above arrangement, the light source 21 can be placed close to the fan-shaped heat storage device 10, which is beneficial to direct most of the light signal emitted by the light source 21 toward the fan-shaped heat storage device 10, reduce the amount of light directed toward the outside of the fan-shaped heat storage device 10, and improve the utilization rate of the light source 21.

[0058] In some embodiments, the minimum distance between the optical signal receiving board 22 and the fan-shaped heat storage element 10 is L2, where 10mm≤L2≤50mm.

[0059] For example, L2 can be 10mm, 30mm or 50mm, etc.

[0060] By configuring the optical signal receiving plate 22 closer to the fan-shaped heat storage element 10, it is beneficial to reduce the scattering of the optical signal passing through the fan-shaped heat storage element 10 before it reaches the optical signal receiving plate 22. This allows more optical signal to be transmitted to the optical signal receiving plate 22, thereby increasing the intensity of the optical signal transmitted to the optical signal receiving plate 22 and improving its detection sensitivity. Furthermore, this configuration also prevents external optical signals from affecting the detection results of the optical signal receiving plate 22.

[0061] In some embodiments, such as Figure 4 As shown, each sector-shaped heat storage element 10 has multiple ventilation holes 10A; these multiple ventilation holes 10A are arranged in M ​​rows along the circumference of the model heat exchanger and in N columns along the radial direction of the model heat exchanger, where M and N are both positive integers. Figure 5As shown, the optical signal receiving board 22 is provided with multiple photodiodes 23. The number and position of the multiple photodiodes 23 are the same as the number and position of the multiple ventilation holes 10A. Each photodiode 23 is electrically connected to the signal processor and is used to receive the optical signal emitted by the light source 21 and passing through the fan-shaped heat storage component 10, and convert the received optical signal into an electrical signal.

[0062] Multiple ventilation holes 10A in each fan-shaped heat storage element 10 can circulate the flowing air.

[0063] For example, the value of M can be 1, 3, or 5, etc., and the value of N can be 1, 6, or 12, etc.

[0064] The number and position of the multiple photodiodes 23 are the same as the number and position of the multiple ventilation holes 10A, indicating that the multiple photodiodes 23 are arranged correspondingly to the multiple ventilation holes 10A. That is, when the fan-shaped heat storage component 10 moves to face the optical signal receiving board 22, each photodiode 23 is facing one ventilation hole 10A.

[0065] In some embodiments, the optical signal receiving board 22 has a grid structure, where the number and position of the multiple grids are the same as the number and position of the multiple ventilation holes. Multiple photodiodes 23 are arranged in a one-to-one correspondence with the multiple grids, with each photodiode 23 positioned at the vertex of its corresponding grid.

[0066] The number and position of multiple grids in the grid structure are the same as the number and position of multiple ventilation holes, indicating that multiple grids are set to correspond to multiple ventilation holes 10A. That is, when the fan-shaped heat storage component 10 moves to face the optical signal receiving board 22, each grid is facing a ventilation hole 10A.

[0067] For example, the optical signal receiving board 22 is designed in a grid pattern, with a photodiode 23 installed at each grid vertex. Multiple photodiodes 23 are also arranged in an M-row × N-column grid optical signal receiving device, so as to receive the optical signal 10A passing through each ventilation hole.

[0068] With the above settings, the optical signal of each ventilation hole 10A can be received by multiple photodiodes 23, which can improve the accuracy of the final electrical signal converted by multiple photodiodes 23. Ultimately, the intensity of the optical signal received by the optical signal receiving board 22 can accurately reflect the blockage of all ventilation holes 10A in the fan-shaped heat storage device 10, thereby improving the accuracy of the flow performance of the final fan-shaped heat storage device 10.

[0069] In some embodiments, the optical signal receiving board 22 is used to convert the received optical signal into an electrical signal.

[0070] For example, photodiode 23 is used to convert optical signals into electrical signals.

[0071] In some examples, such as Figure 1 As shown, a current-to-voltage converter 24 and a data acquisition unit 27 are also provided between the optical signal receiving board 22 and the signal processor. The optical signal receiving board 22 is electrically connected to the signal processor in sequence through the current-to-voltage converter 24 and the data acquisition unit 27.

[0072] The current-to-voltage converter 24 converts the current signal from the optical signal receiver 22 into a voltage signal, and the data acquisition unit 27 converts the voltage signal into a digital signal and transmits it to the signal processor. The signal processor then determines the intensity of the optical signal based on the digital signal.

[0073] For example, the current-to-voltage converter 24 is used to amplify the current signal obtained by the photodiode 23 and convert it into a voltage signal. The data acquisition unit 27 is used to receive the voltage signal and convert it into a digital signal that can be recognized and processed by the signal processor. The digital signal is transmitted to the signal processor (e.g., computer 28) via a USB signal transmission line.

[0074] With the above settings, the electrical signal converted by the optical signal receiving board 22 can be converted so that the signal processor can receive it.

[0075] In some examples, the current-carrying capacity detection device also includes a power supply 25 and a DC-DC converter 26 (e.g., a bipolar power supply). The power supply 25 is electrically connected to the light source 21 and provides a first operating power supply to the light source 21. The DC-DC converter 26 is electrically connected to both the current-to-voltage converter 24 and the power supply 25, and provides a second operating power supply to the current-to-voltage converter 24 by adjusting the power supplied by the power supply 25 (e.g., adjusting it to ±5V DC).

[0076] In some embodiments, such as Figure 6 As shown, the light source 21 includes a light plate and a plurality of strip-shaped light-emitting devices disposed on the light plate. Each strip-shaped light-emitting device extends radially along the mode heat exchanger, and the number and position of the plurality of strip-shaped light-emitting devices are the same as the number and position of the plurality of ventilation holes 10A.

[0077] For example, a light plate is used to fix multiple strip-shaped light-emitting devices.

[0078] The number and position of the multiple strip-shaped light-emitting devices are the same as the number and position of the multiple ventilation holes 10A, indicating that the multiple strip-shaped light-emitting devices are arranged in correspondence with the multiple ventilation holes 10A. That is, when the fan-shaped heat storage component 10 moves to face the light plate, each strip-shaped light-emitting device is facing a ventilation hole 10A.

[0079] With the above settings, compared with dot-shaped light-emitting devices, strip-shaped light-emitting devices can improve the uniformity and collimation of the light signal directed towards the corresponding ventilation hole 10A, and improve the overall intensity of the light signal directed towards the corresponding ventilation hole 10A, thereby improving the intensity of the light signal after passing through each ventilation hole 10A, and preventing the light signal from being too weak to be detected by the light signal receiving board 22 after passing through the ventilation hole 10A.

[0080] In some embodiments, such as Figure 1 As shown, the optical signal receiving and processing component also includes a display. The signal processor is also electrically connected to the display and is used to convert the current-carrying performance of each sector heat storage element 10 into a display signal after obtaining the current-carrying performance of each sector heat storage element 10, and transmit it to the display so that the display can display the current-carrying performance of each sector heat storage element 10.

[0081] For example, when the signal processor is a computer 28, the data acquisition software 29 in the computer 28, after obtaining the flow performance of each sector heat storage element 10, displays the flow performance of the sector heat storage element 10 in a three-dimensional stereoscopic view of the model heat exchanger, thereby graphically displaying the flow performance of each sector heat storage element 10.

[0082] For example, such as Figure 1 As shown, the display can be integrated with the signal processor, for example, the display and the signal processor can be integrated to form a portable computer (such as a laptop, tablet, etc.), which can greatly reduce the difficulty of laying optical signal receiving and processing components and data cables.

[0083] With the above settings, staff can intuitively obtain the flow performance of each sector heat storage element 10 from the display, and thus quickly obtain the blockage status of the model heat exchanger.

[0084] The steps for using the flow performance testing device provided in this embodiment of the utility model are as follows:

[0085] Step 1: Install a light source 21, which is the same size as the fan-shaped heat storage element 10, on the top of the hot end of the rotary air preheater and connect the power supply.

[0086] Step 2: Install a light signal receiving board 22, which is the same size as the fan-shaped heat storage component 10, at the bottom of the cold section of the rotary air preheater, and arrange photodiodes 23 at the apex of the grid surface of the light signal receiving board 22.

[0087] Step 3: Connect the power supply 25 to supply power to the DC-DC converter 26 (±5V).

[0088] Step 4: Connect the DC power supply 26 and the current-to-voltage converter 24 to supply power to the current-to-voltage converter 24.

[0089] Step 5: Connect the computer 28 to the data acquisition unit 27 using a USB signal transmission cable. Check if the system communication is normal.

[0090] Step 6: Start the detection system and begin collecting data. At the same time, start the rotary air preheater rotating wheel and rotate the rotary air preheater rotor at low speed to detect the flow within the fan-shaped heat storage element 10. Determine whether the fan-shaped compartment is blocked and the area of ​​blockage based on the strength of the detected light signal.

[0091] The beneficial effects of the flow performance testing device provided in this embodiment of the invention are as follows: Compared with the prior art, the flow performance testing device of this invention can be used to test the model heat exchanger after the power plant unit is shut down for maintenance. By analyzing the intensity of the collected light signal, the flow performance inside the rotary air preheater can be determined, thereby enabling the inspection of the blockage performance of the rotary air preheater. The measurement accuracy is high, providing reliable data for reference and facilitating timely on-site location and extent of blockage in the rotary air preheater. This flow performance testing device is easy to install and requires few on-site personnel.

[0092] Example 2:

[0093] This utility model embodiment also provides a flow performance testing method for testing a rotary air preheater, using the flow performance testing device in embodiment 1. The flow performance testing method includes steps S100-S700.

[0094] S100, Install the light source 21 on one side of the mode heat exchanger of the rotary air preheater; Install the optical signal receiving and processing component on the side of the mode heat exchanger opposite to the light source 21 and directly facing the light source 21.

[0095] For example, the light source 21 is installed at the top of the hot end of the mode heat exchanger of the rotary air preheater, and the optical signal receiving and processing component is installed at the bottom of the cold end of the mode heat exchanger of the rotary air preheater.

[0096] S200, Start the light source 21, so that the light source 21 emits a light signal to the fan-shaped heat storage device 10, so that the light signal can be transmitted in the ventilation hole 10A of the fan-shaped heat storage device 10.

[0097] S300, Rotation mode heat exchanger, so that the light source 21 is directly opposite a fan-shaped heat storage element 10.

[0098] At this time, the light signal emitted by the light source 21 can be directed toward the fan-shaped heat storage element 10, and after passing through the fan-shaped heat storage element 10, it can be directed toward the light signal receiving and processing component.

[0099] When the fan-shaped heat storage element 10 is blocked, it will obstruct the light signal directed towards the fan-shaped heat storage element 10, thereby reducing the intensity of the light signal passing through the fan-shaped heat storage element 10.

[0100] S400: The intensity of the optical signal passing through the fan-shaped heat storage element 10 is detected by the optical signal receiving and processing component, and the current carrying capacity of the fan-shaped heat storage element 10 is obtained by comparing the intensity of the optical signal with the intensity of the conduction optical signal.

[0101] The intensity of the conductive optical signal is the intensity of the optical signal passing through the fan-shaped heat storage element 10 when the fan-shaped heat storage element 10 is fully conductive (the current carrying capacity is 100%).

[0102] The current-carrying performance of the fan-shaped heat storage element 10 can affect the intensity of the optical signal passing through it. Therefore, the current-carrying performance of the fan-shaped heat storage element 10 can be calculated by comparing the intensity of the detected optical signal with the intensity of the conducted optical signal. Furthermore, the current-carrying performance of the fan-shaped heat storage element 10 can be automatically detected and calculated using an optical signal receiving and processing component.

[0103] S500, continue rotating the mode heat exchanger so that the light source 21 is directly facing the next fan-shaped heat storage element 10.

[0104] S600. Repeat steps S400-S500 until the flow performance of each sector-shaped heat storage element 10 is obtained.

[0105] That is, by rotating the heat exchanger, the light source 21 and the light signal receiving and processing components detect the intensity of the light signal passing through each sector heat storage element 10, and calculate the flow performance of each sector heat storage element 10 by comparing it with the intensity of the conductive light signal.

[0106] S700. The flow performance of the model heat exchanger is obtained based on the flow performance of each sector heat storage element 10.

[0107] The better the flow performance of the model heat exchanger, the less severe the blockage; the worse the flow performance, the more severe the blockage.

[0108] Therefore, the blockage status of the model heat exchanger can be obtained based on its flow performance, thus enabling the detection of blockage in the model heat exchanger.

[0109] Therefore, the intensity of the light signal passing through each sector-shaped heat storage element 10 can be detected by the light source 21 and the light signal receiving and processing components. The flow performance of each sector-shaped heat storage element 10 can be calculated by comparing it with the intensity of the conductive light signal, thereby obtaining the flow performance of the model heat exchanger. This allows for the inverse deduction of the blockage status of the model heat exchanger, enabling automatic detection of blockage. Compared to manual detection in existing technologies, the flow performance detection device can reduce the time required to detect blockage in the model heat exchanger.

[0110] In some embodiments, in step S400, the current-carrying performance of the fan-shaped heat storage element 10 is obtained by comparing and calculating the intensity of the optical signal with the intensity of the conduction optical signal, specifically as follows:

[0111] The percentage obtained by dividing the intensity of the optical signal by the intensity of the conductive optical signal is used as the current-carrying performance of the fan-shaped heat storage element 10.

[0112] As described above, the ratio between the intensity of the optical signal received by the optical signal receiving and processing component and the preset conduction optical signal intensity is equal to the current-carrying performance value of the fan-shaped heat storage component 10.

[0113] For example, if the intensity of the conducting optical signal is 10000 Lux, and the intensity of the optical signal passing through a fan-shaped heat storage element 10 detected by the optical signal receiving and processing component is 3000 Lux, then the current carrying capacity of the fan-shaped heat storage element 10 is: 3000 Lux ÷ 10000 Lux = 30%.

[0114] Understandably, under these conditions, the flow rate of the fan-shaped heat storage element 10 is at most 100% and at least 0%.

[0115] This allows for a quick comparison of the flow performance of each sector-shaped heat storage element 10 with its unblocked flow performance, thus enabling a rapid assessment of the current blockage status of the heat exchanger.

[0116] In some embodiments, after step S700, the flow performance detection method further includes: displaying the flow performance of the mode heat exchanger on a display.

[0117] For example, the display can show the flow performance of the model heat exchanger in a three-dimensional perspective view of the model heat exchanger.

[0118] With the above settings, staff can intuitively see the blockage status and location of the mode heat exchanger, which facilitates subsequent cleaning of the mode heat exchanger based on the blockage status and location.

[0119] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A flow performance testing device for a rotary air preheater, characterized in that, The rotary air preheater includes a mode heat exchanger, which is rotatable about its axis. The mode heat exchanger includes a plurality of fan-shaped heat storage elements (10) distributed about its axis. Each fan-shaped heat storage element (10) has a ventilation hole extending along the axial direction of the mode heat exchanger. The flow performance testing device includes: A light source (21) is disposed on one side of the mode heat exchanger and is used to emit light signals to the fan-shaped heat storage element (10) so that the light signals can be transmitted in the ventilation holes of the fan-shaped heat storage element (10); and, An optical signal receiving and processing component is disposed on the side of the mode heat exchanger opposite to the light source (21) and directly facing the light source (21). It is used to detect the intensity of the optical signal passing through the fan-shaped heat storage element (10), and calculate the flow performance of the fan-shaped heat storage element (10) by comparing the intensity of the optical signal with the preset conduction optical signal intensity, so as to obtain the flow performance of the mode heat exchanger.

2. The flow performance testing device according to claim 1, characterized in that, The optical signal receiving and processing component includes: A light signal receiving board (22) is disposed on the side of the mode heat exchanger opposite to the light source (21) and directly facing the light source (21). It is used to receive the light signal emitted by the light source (21) that passes through the fan-shaped heat storage element (10), and to convert the received light signal into an electrical signal; and, The signal processor is electrically connected to the optical signal receiving board (22) and is used to obtain the intensity of the optical signal based on the electrical signal, and to calculate the current carrying capacity of the fan-shaped heat storage component (10) by comparing the intensity of the optical signal with the intensity of the conduction optical signal.

3. The flow performance testing device according to claim 2, characterized in that, The light source (21) is fan-shaped, and the shape of the light source (21) is adapted to the shape and size of the fan-shaped heat storage component (10); The optical signal receiving board (22) is fan-shaped, and the shape of the optical signal receiving board (22) is adapted to the shape and size of the fan-shaped heat storage component (10).

4. The flow performance testing device according to claim 3, characterized in that, The minimum distance between the light source (21) and the fan-shaped heat storage element (10) is L1, 10mm≤L1≤50mm; The minimum distance between the optical signal receiving board (22) and the fan-shaped heat storage component (10) is L2, 10mm≤L2≤50mm.

5. The flow performance testing device according to claim 3, characterized in that, In each of the fan-shaped heat storage elements (10), there are multiple ventilation holes; the multiple ventilation holes are arranged in M ​​rows along the circumference of the model heat exchanger and in N columns along the radial direction of the model heat exchanger, where M and N are both positive integers; The optical signal receiving board (22) is provided with a plurality of photodiodes (23). The number and position of the plurality of photodiodes (23) are the same as the number and position of the plurality of ventilation holes. Each photodiode (23) is electrically connected to the signal processor and is used to receive the optical signal emitted by the light source (21) and passing through the fan-shaped heat storage component (10) and convert the received optical signal into an electrical signal.

6. The flow performance testing device according to claim 5, characterized in that, The light source (21) includes a light plate and a plurality of strip-shaped light-emitting devices disposed on the light plate; Each of the strip-shaped light-emitting devices extends radially along the mode heat exchanger, and the number and position of the plurality of strip-shaped light-emitting devices are the same as the number and position of the plurality of ventilation holes.

7. The flow performance testing device according to claim 5, characterized in that, The optical signal receiving board (22) has a grid structure, and the number and position of the multiple grids in the grid structure are the same as the number and position of the multiple ventilation holes; Multiple photodiodes (23) are arranged in a one-to-one correspondence with multiple grids, and each photodiode (23) is located at the vertex of the corresponding grid.

8. The flow performance testing device according to claim 2, characterized in that, The optical signal receiving and processing component also includes a display; The signal processor is also electrically connected to the display and is used to convert the current-carrying performance of each of the fan-shaped heat storage elements (10) into a display signal and transmit it to the display after obtaining the current-carrying performance of each of the fan-shaped heat storage elements (10), so that the display can display the current-carrying performance of each of the fan-shaped heat storage elements (10).

9. The flow performance testing device according to claim 2, characterized in that, The optical signal receiving board (22) is used to convert the received optical signal into an electrical signal; A current-to-voltage converter (24) and a data acquisition unit (27) are also provided between the optical signal receiving board (22) and the signal processor. The optical signal receiving board (22) is electrically connected to the signal processor in sequence through the current-to-voltage converter (24) and the data acquisition unit (27). The current-to-voltage converter (24) is used to convert the current signal converted by the optical signal receiving board (22) into a voltage signal, and the data acquisition unit (27) is used to convert the voltage signal into a digital signal and transmit it to the signal processor; The signal processor is used to obtain the intensity of the optical signal based on the digital signal.

10. The flow performance testing device according to claim 9, characterized in that, It also includes a power supply (25) and a DC-DC converter (26); The power supply (25) is electrically connected to the light source (21) and is used to provide the light source (21) with a first working power supply; the DC-DC converter (26) is electrically connected to the current-to-voltage converter (24) and the power supply (25) respectively, and is used to adjust the power provided by the power supply (25) and send it to the current-to-voltage converter (24) to provide the current-to-voltage converter (24) with a second working power supply.

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