Through-flow performance detection device and through-flow performance detection method

Abstract

According to the through-flow performance detection device and the through-flow performance detection method disclosed by the invention, the through-flow performance of a fan-shaped heat storage piece can be automatically detected by using the through-flow performance detection device, 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] The invention belongs to the technical field of air preheater detection, and in particular relates to a flow performance detection device and a flow performance detection method. Background Art

[0002] At the tail of the boiler in a thermal power plant, the air preheater is a key heat exchange component. On the one hand, it can reduce the heat of the flue gas and reduce heat loss. On the other hand, it can heat the primary and secondary air temperatures required for combustion and improve combustion efficiency. Therefore, the efficient operation of the air preheater is an important part of ensuring the safe and stable operation of the thermal power unit.

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

[0004] The air preheater equipment is relatively large, including multiple fan-shaped heat storage elements. Due to the lack of equipment that can detect the blockage of the air preheater, the blockage of the ventilation holes in each fan-shaped heat storage element can only be detected manually. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a flow performance detection device and a flow performance detection method in view of the above-mentioned deficiencies in the prior art. By using the flow performance detection device, the flow performance of the fan-shaped heat storage element can be automatically detected, thereby detecting the blockage of the air preheater and avoiding manual detection.

[0006] In the first aspect, an embodiment of the present invention provides a flow performance detection device, which is used for a rotary air preheater. The rotary air preheater includes a mode heat exchanger, which can rotate around its axis, and the mode heat exchanger includes a plurality of fan-shaped heat storage parts distributed around its axis, and each of the fan-shaped heat storage parts is provided with a ventilation hole extending along the axis direction of the mode heat exchanger. The flow performance detection device includes a light source and an optical signal receiving and processing component. The light source is arranged on one side of the mode heat exchanger, and is used to emit an optical signal to the fan-shaped heat storage part, so that the optical signal can be transmitted in the ventilation hole of the fan-shaped heat storage part. The optical signal receiving and processing component is arranged on the side of the mode heat exchanger opposite to the light source, and is directly opposite to the light source, and is used to detect the intensity of the optical signal passing through the fan-shaped heat storage part, and the intensity of the optical signal is compared with the preset conduction optical signal intensity to calculate and obtain the flow performance of the fan-shaped heat storage part, so as to obtain the flow performance of the mode 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 arranged on the side of the mode heat exchanger opposite to the light source and directly opposite to the light source, and is used to receive the optical signal emitted by the light source and passing through the fan-shaped heat storage element, and 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 according to the electrical signal, and compare the intensity of the optical signal with the intensity of the conduction optical signal to obtain the flow performance of the fan-shaped heat storage element.

[0008] In some embodiments, the light source is fan-shaped, and the shape and size of the light source match the shape and size of the fan-shaped heat storage element. The light signal receiving board is fan-shaped, and the shape and size of the light signal receiving board match 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, 10 mm ≤ L1 ≤ 50 mm. The minimum distance between the optical signal receiving board and the fan-shaped heat storage element is L2, 10 mm ≤ L2 ≤ 50 mm.

[0010] In some embodiments, in each of the fan-shaped heat storage elements, the number of the ventilation holes is multiple; the multiple ventilation holes are arranged in M ​​rows along the circumference of the mode heat exchanger and in N columns along the radial direction of the mode heat exchanger, and M and N are both positive integers. A plurality of photodiodes are arranged on the optical signal receiving board, and the number and position of the plurality of photodiodes are the same as the number and position of the plurality of ventilation holes, and each photodiode is electrically connected to the signal processor to receive the optical signal emitted by the light source and passing through the fan-shaped heat storage element, and convert the received optical signal into an electrical signal.

[0011] In some embodiments, the light source includes a light board and a plurality of strip-shaped light emitting devices disposed on the light board. 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 and processing component further includes a display. The signal processor is also electrically connected to the display, and is used to convert the flow performance of the corresponding fan-shaped heat storage element into a display signal after obtaining the flow performance of each fan-shaped heat storage element, and transmit it to the display, so that the display displays the flow performance of each fan-shaped heat storage element.

[0013] Therefore, the flow performance detection device provided in the embodiment of the present invention can emit a light signal to the fan-shaped heat storage element by arranging a light source on one side of the mode heat exchanger, so that the light signal can be transmitted in the ventilation holes of the fan-shaped heat storage element. By arranging an optical signal receiving and processing component on the side of the mode heat exchanger opposite to the light source, and making the optical signal receiving and processing component face the light source, the intensity of the optical signal emitted by the light source and passing through the fan-shaped heat storage element can be detected; and the fan-shaped heat storage element has different flow performances, and the blocking conditions of the optical signal emitted by the light source are different. The intensity of the optical signal emitted to the optical signal receiving and processing component after passing through the fan-shaped heat storage element is also different. Therefore, the ratio of the intensity of the optical signal received by the optical signal receiving and processing component to the preset conduction optical signal intensity is also different. By making the optical signal receiving and processing component compare and calculate the intensity of the received optical signal with the preset conduction optical signal intensity, the flow performance of the fan-shaped heat storage element can be obtained, and thus the flow performance of each fan-shaped heat storage element can be obtained, and the overall flow performance of the mode heat exchanger can be obtained, and the blockage condition of the mode heat exchanger can be reversely deduced based on the overall flow performance of the mode heat exchanger, thereby realizing automatic detection of the blockage condition of the mode heat exchanger. In addition, the optical signal receiving and processing component 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 detection in the prior art, it is helpful to reduce the detection time of the air preheater blockage.

[0014] In the second aspect, the embodiment of the present invention further provides a flow performance detection method, which is used to detect a rotary air preheater, and uses the flow performance detection device in the first aspect. The flow performance detection method includes: steps S100-S700. S100, install a light source on one side of the mode heat exchanger of the rotary air preheater; install an optical signal receiving and processing component on the side of the mode heat exchanger opposite to the light source and facing the light source. S200, start the light source, so that the light source emits an optical signal to the fan-shaped heat storage element, so that the optical signal can be transmitted in the ventilation hole of the fan-shaped heat storage element. S300, rotate the mode heat exchanger so that the light source faces one of the fan-shaped heat storage elements. S400, detect the intensity of the optical signal passing through the fan-shaped heat storage element through the optical signal receiving and processing component, and compare the intensity of the optical signal with the intensity of the conduction optical signal to obtain the flow performance of the fan-shaped heat storage element. S500, continue to rotate the mode heat exchanger so that the light source is directly opposite to the next fan-shaped heat storage element. S600, repeat the above steps S400-S500 until the flow performance of each fan-shaped heat storage element is obtained. S700, obtain the flow performance of the mode heat exchanger according to the flow performance of each fan-shaped heat storage element.

[0015] In some embodiments, the intensity of the optical signal is compared with the intensity of the conduction optical signal to obtain the flow performance of the fan-shaped heat storage element, specifically: the percentage obtained by dividing the intensity of the optical signal by the intensity of the conduction optical signal is used as the flow performance of the fan-shaped heat storage element.

[0016] In some embodiments, after step S700, the flow performance detection method further includes: displaying the flow performance of the mode heat exchanger through a display.

[0017] The flow performance detection method provided in the embodiment of the present invention has the same beneficial effects as the flow performance detection device described above, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 : A structural diagram of a flow performance detection device provided by an embodiment of the present invention;

[0019] Figure 2 : A structural diagram of a rotary air preheater provided in an embodiment of the present invention;

[0020] Figure 3 : A structural diagram of a model heat exchanger provided in an embodiment of the present invention;

[0021] Figure 4 : A structural diagram of a fan-shaped heat storage element provided in an embodiment of the present invention;

[0022] Figure 5 : A structural diagram of an optical signal receiving board provided in an embodiment of the present invention;

[0023] Figure 6 : A structural diagram of a light source provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0025] Embodiment 1:

[0026] like Figure 1 As shown, an embodiment of the present invention provides a flow performance detection device, which is applied in the maintenance process of a rotary air preheater to detect the blockage of the rotary air preheater.

[0027] like Figure 2 and Figure 3 As shown, Figure 2 This is a structural diagram of a rotary air preheater. Figure 3 The rotary air preheater includes a hot end primary air connection flange plate 1, a hot end primary air truss 2, a hot end inner connection ring 3, a sealing angle steel 4, a radial sealing sheet 5, a grid frame 6, a rotor transmission device 7, a guide bearing device 8, a hot end center truss 9, a mode heat exchanger (including a plurality of fan-shaped heat storage parts 10), a primary air seat frame 11, a main seat frame and an axial sealing plate 12, a cold end center truss 13, a rotor housing guard plate 14, a hot end outer connection ring 15, a cold end connection ring 16, a corner assembly 17, a sliding pad 18, a side seat frame 19, and a side seat frame guard plate 20.

[0028] Combination Figure 3 and Figure 4 The mode heat exchanger can rotate around its axis. In the mode heat exchanger, a plurality of fan-shaped heat storage elements 10 are distributed around the axis of the mode heat exchanger, and each fan-shaped heat storage element 10 is provided with a ventilation hole 10A extending along the axis direction of the mode heat exchanger.

[0029] When the air passes through the ventilation hole 10A, it can exchange heat with the fan-shaped heat storage component 10 (absorb heat or release heat) and temporarily store the heat on the fan-shaped heat storage component 10. After the fan-shaped heat storage component 10 moves to the target position, the heat is exchanged with the air at the target position again (release heat or absorb heat).

[0030] For example, Figure 4 As shown, there are multiple ventilation holes 10A on each fan-shaped heat storage element 10 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.

[0031] The working principle of the rotary air preheater is as follows: during the operation of the rotary air preheater, the mode heat exchanger can rotate clockwise around its axis, thereby driving the plurality of fan-shaped heat storage elements 10 to rotate around the axis of the mode heat exchanger. Figure 2 As shown, high temperature (e.g. 340°C) flue gas flows along Figure 2 The A1 direction in the figure passes through the mode heat exchanger from top to bottom, thereby heating up the fan-shaped heat storage element 10 in the mode heat exchanger. The heated fan-shaped heat storage element 10 rotates to the primary air inlet area, and the primary air flows along Figure 2 The fan-shaped heat storage element 10 after heating can heat the primary air (for example, to 170°C). Then, the fan-shaped heat storage element 10 after heating continues to rotate to the secondary air inlet area, and the secondary air flows along Figure 2 The fan-shaped heat storage element 10 passes through the mode heat exchanger from bottom to top in the A3 direction in the figure. The heated fan-shaped heat storage element 10 can continue to heat the secondary air (for example, to 140°C). The heated fan-shaped heat storage element 10 lowers its temperature after heating the primary and secondary air, and continues to rotate to the high-temperature flue gas inlet area. The high-temperature flue gas flows along the fan-shaped heat storage element 10. Figure 2 The A1 direction passes through the mode heat exchanger from top to bottom to heat the fan-shaped heat storage element 10 again, and the cycle continues so that the mode heat exchanger continues to heat the primary air and the secondary air.

[0032] like Figure 1 As shown, the flow performance detection device includes a light source 21 and a light signal receiving and processing component. The light source 21 is arranged on one side of the mode heat exchanger, and is used to emit a light signal to the fan-shaped heat storage member 10, so that the light signal can be transmitted in the ventilation hole 10A of the fan-shaped heat storage member 10. The light signal receiving and processing component is arranged on the side of the mode heat exchanger opposite to the light source 21, and is directly opposite to the light source 21, and is used to detect the intensity of the light signal passing through the fan-shaped heat storage member 10, and compare the intensity of the light signal with the preset conduction light signal intensity to calculate and obtain the flow performance of the fan-shaped heat storage member 10, so as to obtain the flow performance of the mode heat exchanger.

[0033] Exemplarily, the type of the light source 21 may be a fluorescent lamp, an LED lamp, etc. The intensity of the light signal emitted by the light source 21 can 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 .

[0034] Exemplarily, the light source 21 is disposed above the mode heat exchanger (e.g., at the top of the hot end of the rotary air preheater), and the optical signal receiving and processing component is disposed below the mode heat exchanger (e.g., at the bottom of the cold end of the rotary air preheater). The optical signal emitted by the light source 21 passes through the ventilation hole 10A of the fan-shaped heat storage element 10 from top to bottom and then is emitted to the optical signal receiving and processing component.

[0035] Exemplarily, the preset conduction optical signal strength is the strength of the optical signal passing through the fan-shaped heat storage element 10 detected by the optical signal receiving and processing component when the fan-shaped heat storage element 10 is fully turned on.

[0036] Exemplarily, the flow performance of the fan-shaped heat storage element 10 may be a percentage of the ratio of an actual flow area of ​​the fan-shaped heat storage element 10 to a flow area when not blocked.

[0037] It can be understood that the fan-shaped heat storage element 10 has different flow performances and blocks the light signal emitted by the light source 21 in different conditions, so that the intensity of the light signal received by the light signal receiving and processing component is also different.

[0038] Exemplarily, when the fan-shaped heat storage component 10 is not blocked, the flow performance of the fan-shaped heat storage component 10 is good (the flow performance is 100%), and the ventilation hole 10A in the fan-shaped heat storage component 10 does not block the optical signal emitted by the light source 21. The optical signal can all pass through the fan-shaped heat storage component 10 to the optical signal receiving and processing component. The intensity of the optical signal received by the optical signal receiving and processing component is the strongest, which is equal to the above-mentioned preset conduction optical signal intensity.

[0039] Exemplarily, when the fan-shaped heat storage component 10 is partially blocked, for example, the degree of blockage is 40%, the actual flow area of ​​the fan-shaped heat storage component 10 becomes 60% of the flow area of ​​the fan-shaped heat storage component 10 when it is not blocked (the flow performance is 60%), and the flow performance of the fan-shaped heat storage component 10 will decrease. The blocking material in the ventilation hole 10A in the fan-shaped heat storage component 10 will produce a certain obstruction to the light signal emitted by the light source 21. Among all the light signals emitted by the light source 21, only 60% can pass through the fan-shaped heat storage component 10 to the light signal receiving and processing component, and the intensity of the light signal received by the light signal receiving and processing component also becomes weaker accordingly, becoming 60% of the above-mentioned preset conduction light signal intensity.

[0040] Exemplarily, when the fan-shaped heat storage element 10 is completely blocked, the flow performance 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.

[0041] From the above examples, it can be seen that the ratio between the intensity of the optical signal received by the optical signal receiving and processing component and the preset intensity of the conduction optical signal is equal to the value of the flow performance of the fan-shaped thermal storage component 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 conduction optical signal, the value of the flow performance of the fan-shaped thermal storage component 10 can be obtained.

[0042] Therefore, the process in which the optical signal receiving and processing component compares the intensity of the optical signal with the preset on-light signal intensity to calculate the flow performance of the fan-shaped heat storage element 10 can be exemplified as follows:

[0043] For example, if the intensity of the conduction 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 flow performance of the fan-shaped heat storage element 10 is: 3000 Lux ÷ 10000 Lux = 30%.

[0044] Therefore, the optical signal receiving and processing component can calculate the comparison result of the intensity of the detected optical signal and the preset conduction optical signal intensity (i.e. the above-mentioned percentage relationship) by detecting the intensity of the optical signal passing through the fan-shaped heat storage element 10, thereby obtaining the flow performance of the fan-shaped heat storage element 10. After obtaining the flow performance of each fan-shaped heat storage element 10 in turn, the flow performance of the entire mode heat exchanger can be obtained. According to the flow performance of the mode heat exchanger, the blockage condition of the mode heat exchanger can be reversely deduced, and the blockage condition of the mode heat exchanger can be detected, so as to provide the staff with reliable data as a reference, which is beneficial for the staff to find the blockage position and blockage degree of the rotary air preheater in time on site and handle it, so as to ensure the maintenance quality of the rotary air preheater and improve the operating efficiency of the rotary air preheater.

[0045] Furthermore, the optical signal receiving and processing component 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 is beneficial to reducing the detection time of the blockage of the air preheater.

[0046] Therefore, the flow performance detection device provided in the embodiment of the present invention can emit a light signal to the fan-shaped heat storage component 10 by setting a light source 21 on one side of the mode heat exchanger, so that the light signal can be transmitted in the ventilation hole 10A of the fan-shaped heat storage component 10. By setting an optical signal receiving and processing component on the side of the mode heat exchanger opposite to the light source 21, and making the optical signal receiving and processing component face the light source 21, the intensity of the optical signal emitted by the light source 21 and passing through the fan-shaped heat storage component 10 can be detected; and the fan-shaped heat storage component 10 has different flow performances, and the blocking conditions of the optical signal emitted by the light source 21 are different. The intensity of the optical signal emitted to the optical signal receiving and processing component after passing through the fan-shaped heat storage component 10 is also different. Therefore, the ratio of the intensity of the optical signal received by the optical signal receiving and processing component to the preset conduction optical signal intensity is also different. By making the optical signal receiving and processing component compare and calculate the intensity of the received optical signal with the preset conduction optical signal intensity, the flow performance of the fan-shaped heat storage component 10 can be obtained, and thus the flow performance of each fan-shaped heat storage component 10 can be obtained, and the overall flow performance of the mode heat exchanger can be obtained, and the blockage condition of the mode heat exchanger can be reversely deduced based on the overall flow performance of the mode heat exchanger, thereby realizing the detection of the blockage condition of the mode heat exchanger. In addition, the optical signal receiving and processing component can automatically compare and calculate the flow performance of the fan-shaped heat storage component 10 to quickly obtain the flow performance of the fan-shaped heat storage component 10. Compared with the manual detection in the prior art, it is helpful to reduce the detection time of the air preheater blockage.

[0047] In some embodiments, Figure 1 As 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 arranged on the side of the mode heat exchanger opposite to the light source 21 and directly opposite to the light source 21, and is used to receive the optical signal emitted by the light source 21 and passing through the fan-shaped heat storage member 10, and convert 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 according to the electrical signal, and compare the intensity of the optical signal with the intensity of the conduction optical signal to obtain the flow performance of the fan-shaped heat storage member 10.

[0048] Exemplarily, a photoelectric conversion element is disposed on the optical signal receiving board 22 for converting the optical signal into a corresponding electrical signal.

[0049] It can be understood that the greater the intensity of the optical signal, the greater the intensity of the corresponding electrical signal after conversion.

[0050] Exemplarily, the optical signal receiving board 22 is connected to the signal processor via a data line, and the electrical signal is transmitted to the signal processor via the data line.

[0051] Exemplarily, the signal processor includes a microprocessor, which can perform comparative calculations on input data and obtain calculation results.

[0052] For example, 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 calculates the received electrical signal to obtain the flow performance of the fan-shaped heat storage element 10.

[0053] Through the above arrangement, it is convenient to install the optical signal receiving board 22 on site and to flexibly set the position of the signal processor.

[0054] In some embodiments, Figure 1 As shown, the light source 21 is fan-shaped, and the shape and size of the light source 21 are adapted to the shape and size of the fan-shaped heat storage member 10. The light signal receiving plate 22 is fan-shaped, and the shape and size of the light signal receiving plate 22 are adapted to the shape and size of the fan-shaped heat storage member 10.

[0055] Through the above-mentioned arrangement, the light source 21 can be completely covered on the fan-shaped heat storage component 10, so that the light signal emitted by the light source 21 can be emitted to all the ventilation holes 10A of the fan-shaped heat storage component 10; the shape of the light signal receiving board 22 can also be completely covered on the fan-shaped heat storage component 10, so that the light signal receiving board 22 can completely receive the light signal emitted from each ventilation hole 10A, so that the blockage condition of each ventilation hole 10A can affect the intensity of the light signal finally received by the light signal receiving board 22, and finally the intensity of the light signal received by the light signal receiving board 22 can reflect the blockage condition of all the ventilation holes 10A in the fan-shaped heat storage component 10, thereby improving the accuracy of the flow performance of the fan-shaped heat storage component 10.

[0056] In some embodiments, the minimum distance between the light source 21 and the fan-shaped heat storage element 10 is L1, and 10 mm≤L1≤50 mm.

[0057] Exemplarily, L1 may be 10 mm, 30 mm, or 50 mm, etc.

[0058] Through the above arrangement, the light source 21 can be arranged close to the fan-shaped heat storage element 10, which is beneficial for most of the light signals emitted by the light source 21 to be directed to the fan-shaped heat storage element 10, reducing the amount of light directed to the outside of the fan-shaped heat storage element 10, and improving the utilization rate of the light source 21.

[0059] In some embodiments, the minimum distance between the optical signal receiving plate 22 and the fan-shaped heat storage element 10 is L2, and 10 mm≤L2≤50 mm.

[0060] Exemplarily, L2 may be 10 mm, 30 mm, or 50 mm, etc.

[0061] Through the above arrangement, the optical signal receiving board 22 can be arranged close to the fan-shaped heat storage member 10, which is conducive to reducing the scattering of the optical signal passing through the fan-shaped heat storage member 10 when being transmitted to the optical signal receiving board 22, so that more optical signals can be transmitted to the optical signal receiving board 22, thereby increasing the intensity of the optical signal transmitted to the optical signal receiving board 22 and improving the detection sensitivity of the optical signal receiving board 22. In addition, the above arrangement can also prevent the external optical signal from affecting the detection result of the optical signal receiving board 22 after being emitted to the optical signal receiving board 22.

[0062] In some embodiments, Figure 4 As shown, in each fan-shaped heat storage element 10, the number of ventilation holes 10A is multiple; the multiple ventilation holes 10A are arranged in M ​​rows along the circumference of the mode heat exchanger and arranged in N columns along the radial direction of the mode heat exchanger, and M and N are both positive integers. Figure 5 As shown, a plurality of photodiodes 23 are arranged on the optical signal receiving board 22, and the number and position of the plurality of photodiodes 23 are the same as the number and position of the plurality of ventilation holes 10A. Each photodiode 23 is electrically connected to the signal processor for receiving the optical signal emitted by the light source 21 and passing through the fan-shaped heat storage element 10, and converting the received optical signal into an electrical signal.

[0063] The multiple ventilation holes 10A in each fan-shaped heat storage element 10 can sort out the air flowing through.

[0064] For example, the value of M may be 1, 3, 5, etc., and the value of N may be 1, 6, 12, etc.

[0065] 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 corresponding to the multiple ventilation holes 10A, that is, when the fan-shaped heat storage element 10 moves to face the optical signal receiving board 22, each photodiode 23 faces a ventilation hole 10A.

[0066] Exemplarily, the optical signal receiving board 22 is designed in a grid format, a photodiode 23 is installed at each grid vertex, and multiple photodiodes 23 are also arranged into a grid optical signal receiving device of M rows × N columns, so that the optical signal passing through each ventilation hole 10A can be received accordingly.

[0067] Through the above-mentioned arrangement, the optical signal of each ventilation hole 10A can be received by multiple photodiodes 23, which can improve the accuracy of the electrical signal finally converted by the multiple photodiodes 23. Ultimately, the intensity of the optical signal received by the optical signal receiving board 22 can accurately reflect the blockage status of all the ventilation holes 10A in the fan-shaped heat storage component 10, thereby improving the accuracy of the flow performance of the fan-shaped heat storage component 10.

[0068] Exemplarily, the photodiode 23 is used to convert an optical signal into a current signal.

[0069] In some examples, such as Figure 1 As shown, a current-voltage converter 24 and a data collector 27 are further 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 via the current-voltage converter 24 and the data collector 27 in sequence.

[0070] The current-to-voltage converter 24 is used to amplify the current signal converted by the photodiode 23 and convert it into a voltage signal. The data acquisition device 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 above digital signal is transmitted to the signal processor (such as a computer 28) via a USB signal transmission line.

[0071] In some examples, the current flow performance detection device further includes a power supply 25 and a DC conversion power supply 26 (for example, a bipolar power supply). The power supply 25 is electrically connected to the light source 21, and is used to provide a first working power supply to the light source 21. The DC conversion power supply 26 is electrically connected to the current-voltage converter 24 and the power supply 25, respectively, and is used to transfer the power provided by the power supply 25 to the current-voltage converter 24 after adjustment (for example, adjusted to ±5V DC), so as to provide a second working power supply to the current-voltage converter 24.

[0072] In some embodiments, Figure 6 As shown, the light source 21 includes a light board and a plurality of strip-shaped light emitting devices arranged on the light board. 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.

[0073] Exemplarily, the light board is used to fix a plurality of strip-shaped light-emitting devices.

[0074] 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 corresponding to the multiple ventilation holes 10A, that is, when the fan-shaped heat storage element 10 is moved to face the light panel, each strip-shaped light-emitting device faces a ventilation hole 10A.

[0075] Through the above-mentioned settings, compared with point-shaped light-emitting devices, strip-shaped light-emitting devices can improve the uniformity and collimation of light signals emitted to the corresponding ventilation holes 10A, and improve the overall intensity of light signals emitted to the corresponding ventilation holes 10A, thereby increasing the intensity of light signals after passing through each ventilation hole 10A, and avoiding the situation where the intensity of light signals after passing through the ventilation holes 10A is too small to be detected by the optical signal receiving board 22.

[0076] In some embodiments, Figure 1As 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 flow performance of the corresponding fan-shaped heat storage member 10 into a display signal and transmit it to the display after obtaining the flow performance of each fan-shaped heat storage member 10, so that the display can display the flow performance of each fan-shaped heat storage member 10.

[0077] Exemplarily, when the signal processor is a computer 28, the data acquisition software 29 in the computer 28, after obtaining the flow performance of each fan-shaped heat storage component 10, displays the flow performance of the fan-shaped heat storage component 10 in a three-dimensional stereogram of the model heat exchanger, thereby graphically displaying the flow performance of each fan-shaped heat storage component 10.

[0078] Exemplarily, the display may be integrated with the signal processor, for example, the display and the signal processor may be integrated together to form a portable computer, which can greatly reduce the difficulty of laying optical signal receiving and processing components and data lines.

[0079] Through the above arrangement, the staff can intuitively obtain the flow performance of each fan-shaped heat storage element 10 from the display, and then quickly obtain the blockage condition of the mode heat exchanger.

[0080] The steps for using the flow performance detection device provided in the embodiment of the present invention are as follows:

[0081] Step 1: Install a light source 21 of a size equivalent to that of the fan-shaped heat storage element 10 on the top of the hot end of the rotary air preheater and turn on the power.

[0082] Step 2, install an optical signal receiving board 22 of the same size as the fan-shaped heat storage element 10 at the bottom of the cold section of the rotary air preheater, and arrange photodiodes 23 at the vertices of the grid surface of the optical signal receiving board 22.

[0083] Step 3, turn on the power supply 25 to supply power to the DC conversion power supply 26 (±5V).

[0084] Step 4: Connect the DC conversion power supply 26 and the current-voltage converter 24 to supply power to the current-voltage converter 24 .

[0085] Step 5: Connect the computer 28 and the data collector 27 with a USB signal transmission line to check whether the system communication is normal.

[0086] Step 6, start the detection system, start collecting data, start the rotary air preheater cranking, rotate the rotary air preheater rotor at a low speed, detect the fluidity in the fan-shaped heat storage element 10, and determine whether the fan-shaped bin is blocked and the blocked area based on the strength of the detected light signal.

[0087] Beneficial effects of the flow performance detection device provided by the embodiment of the present invention: Compared with the prior art, the flow performance detection device of the present invention can detect the mode heat exchanger by installing the flow performance detection device after the power plant unit is shut down for maintenance, so as to analyze and judge the flow performance inside the rotary air preheater through the intensity of the collected optical signal, thereby realizing the blockage performance inspection of the rotary air preheater, with high measurement accuracy, so as to provide reliable data for the staff as a reference, which is conducive to timely finding the location and degree of blockage of the rotary air preheater on site. The flow performance detection device is easy to install and requires fewer staff on site.

[0088] Embodiment 2:

[0089] The embodiment of the present invention further provides a flow performance detection method for detecting a rotary air preheater, using the flow performance detection device in Embodiment 1. The flow performance detection method includes steps S100-S700.

[0090] S100, installing the light source 21 on one side of the mode heat exchanger of the rotary air preheater; installing the optical signal receiving and processing component on the side of the mode heat exchanger opposite to the light source 21 and facing the light source 21.

[0091] 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.

[0092] S200 , start the light source 21 to enable the light source 21 to emit a light signal to the fan-shaped heat storage component 10 , so that the light signal can be transmitted in the ventilation hole 10A of the fan-shaped heat storage component 10 .

[0093] S300 , rotating the mode heat exchanger so that the light source 21 is directly opposite to a fan-shaped heat storage element 10 .

[0094] At this time, the optical signal emitted by the light source 21 can be emitted toward the fan-shaped heat storage element 10 , and then emitted toward the optical signal receiving and processing component after passing through the fan-shaped heat storage element 10 .

[0095] When the fan-shaped heat storage element 10 is blocked, light directed toward the fan-shaped heat storage element 10 will be blocked, thereby reducing the intensity of the light signal passing through the fan-shaped heat storage element 10 .

[0096] S400, detecting the intensity of the optical signal passing through the fan-shaped heat storage element 10 through the optical signal receiving and processing component, and comparing the intensity of the optical signal with the intensity of the conduction optical signal to obtain the flow performance of the fan-shaped heat storage element 10 through calculation.

[0097] The on-light signal intensity is the intensity of the light signal passing through the fan-shaped heat storage element 10 detected by the light signal receiving and processing component when the fan-shaped heat storage element 10 is fully on (the flow performance at this time is 100%).

[0098] The flow performance of the fan-shaped heat storage member 10 can affect the intensity of the optical signal passing through the fan-shaped heat storage member 10, so that the flow performance of the fan-shaped heat storage member 10 can be obtained by comparing and calculating the intensity of the detected optical signal with the intensity of the conduction optical signal. And the flow performance of the fan-shaped heat storage member 10 can be automatically detected and calculated through the optical signal receiving and processing component.

[0099] S500 , continue to rotate the mode heat exchanger so that the light source 21 is directly opposite to the next fan-shaped heat storage element 10 .

[0100] S600, repeat the above steps S400-S500 until the flow performance of each fan-shaped heat storage element 10 is obtained.

[0101] That is, by rotating the mode heat exchanger, the light source 21 and the optical signal receiving and processing components detect the intensity of the optical signal passing through each fan-shaped heat storage element 10, and obtain the flow performance of each fan-shaped heat storage element 10 after comparing and calculating with the intensity of the conductive optical signal.

[0102] S700 , obtaining the flow performance of the model heat exchanger according to the flow performance of each fan-shaped heat storage element 10 .

[0103] The better the flow performance of the mode heat exchanger is, the less blocked the mode heat exchanger is; the worse the flow performance of the mode heat exchanger is, the more seriously blocked the mode heat exchanger is.

[0104] Therefore, the blockage condition of the mode heat exchanger can be obtained according to the flow performance of the mode heat exchanger, thereby realizing the detection of the blockage condition of the mode heat exchanger.

[0105] Thus, the intensity of the light signal passing through each fan-shaped heat storage element 10 can be detected by the light source 21 and the light signal receiving and processing component, and the flow performance of each fan-shaped heat storage element 10 can be obtained by comparing and calculating with the intensity of the conduction light signal, and then the flow performance of the mode heat exchanger can be obtained, and the blockage condition of the mode heat exchanger can be reversely deduced, so as to realize automatic detection of the blockage condition of the mode heat exchanger. Compared with the manual detection in the prior art, the flow performance detection device can reduce the time for detecting the blockage condition of the mode heat exchanger.

[0106] In some embodiments, in step S400, the intensity of the optical signal is compared with the intensity of the conduction optical signal to obtain the flow performance of the fan-shaped heat storage element 10, which is specifically:

[0107] The percentage obtained by dividing the intensity of the light signal by the intensity of the conduction light signal is used as the flow performance of the fan-shaped heat storage element 10.

[0108] As described above, the ratio between the intensity of the optical signal received by the optical signal receiving and processing component and the preset intensity of the conduction optical signal is equal to the value of the flow performance of the fan-shaped heat storage element 10.

[0109] For example, the intensity of the conduction 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 flow performance of the fan-shaped heat storage element 10 is: 3000 Lux ÷ 10000 Lux = 30%.

[0110] It can be understood that, in this case, the flow performance of the fan-shaped heat storage element 10 is 100% at the highest and 0 at the lowest.

[0111] In this way, the comparative relationship between the flow performance of each fan-shaped heat storage element 10 and the flow performance when not blocked can be quickly obtained, so that the blockage condition of the heat exchanger in the current mode can be quickly obtained.

[0112] In some embodiments, after step S700, the flow performance detection method further includes: displaying the flow performance of the mode heat exchanger through a display.

[0113] Exemplarily, the display may display the flow performance of the mode heat exchanger in a three-dimensional stereogram of the mode heat exchanger.

[0114] Through the above arrangement, the staff can intuitively obtain the blockage condition and blockage position of the mode heat exchanger, so as to facilitate the subsequent cleaning of the mode heat exchanger according to the blockage condition and blockage position of the mode heat exchanger.

[0115] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A flow performance detection device for a rotary air preheater, characterized in that: The rotary air preheater comprises a mode heat exchanger, the mode heat exchanger is capable of rotating around its axis, the mode heat exchanger comprises a plurality of fan-shaped heat storage elements (10) distributed around its axis, each of the fan-shaped heat storage elements (10) is provided with a ventilation hole extending along the axis direction of the mode heat exchanger; The flow performance detection device comprises: A light source (21) is arranged on one side of the mode heat exchanger and is used to emit a light signal to the fan-shaped heat storage element (10), so that the light signal can be transmitted in the ventilation hole of the fan-shaped heat storage element (10); and, An optical signal receiving and processing component is arranged on a side of the mode heat exchanger opposite to the light source (21) and directly facing the light source (21), and is used to detect the intensity of the optical signal passing through the fan-shaped heat storage element (10), and compare the intensity of the optical signal with a preset conduction optical signal intensity to obtain the flow performance of the fan-shaped heat storage element (10) after calculation, so as to obtain the flow performance of the mode heat exchanger.

2. The flow performance detection device according to claim 1, characterized in that: The optical signal receiving and processing component comprises: an optical signal receiving plate (22), arranged on a side of the mode heat exchanger opposite to the light source (21) and directly facing the light source (21), for receiving an optical signal emitted by the light source (21) and passing through the fan-shaped heat storage element (10), and converting the received optical signal into an electrical signal; and, A signal processor is electrically connected to the optical signal receiving board (22) and is used to obtain the intensity of the optical signal according to the electrical signal, and to obtain the flow performance of the fan-shaped heat storage element (10) by comparing and calculating the intensity of the optical signal with the intensity of the conduction optical signal.

3. The flow performance detection device according to claim 2, characterized in that: The light source (21) is in the shape of a sector, and the shape of the light source (21) matches the shape and size of the sector-shaped heat storage element (10); The shape of the optical signal receiving plate (22) is fan-shaped, and the shape of the optical signal receiving plate (22) is compatible with the shape and size of the fan-shaped heat storage component (10).

4. The flow performance detection 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, 10 mm ≤ L1 ≤ 50 mm; The minimum distance between the optical signal receiving plate (22) and the fan-shaped heat storage element (10) is L2, 10 mm ≤ L2 ≤ 50 mm.

5. The flow performance detection device according to claim 3, characterized in that: In each of the fan-shaped heat storage elements (10), the number of the ventilation holes is multiple; the multiple ventilation holes are arranged in M ​​rows along the circumference of the mode heat exchanger, and are arranged in N columns along the radial direction of the mode heat exchanger, and M and N are both positive integers; A plurality of photodiodes (23) are arranged on the optical signal receiving board (22); 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 for receiving the optical signal emitted by the light source (21) and passing through the fan-shaped heat storage element (10), and converting the received optical signal into an electrical signal.

6. The flow performance detection device according to claim 5, characterized in that: The light source (21) comprises a light panel and a plurality of strip-shaped light-emitting devices arranged on the light panel; Each of the strip-shaped light-emitting devices extends in the radial direction of 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 detection device according to claim 2, characterized in that: The optical signal receiving and processing assembly also includes a display; The signal processor is also electrically connected to the display and is used for, after obtaining the flow performance of each of the fan-shaped heat storage components (10), converting the flow performance of the corresponding fan-shaped heat storage component (10) into a display signal and transmitting it to the display, so that the display displays the flow performance of each of the fan-shaped heat storage components (10).

8. A method for detecting flow performance, for detecting a rotary air preheater, using the flow performance detection device according to any one of claims 1 to 7, characterized in that: include: Steps S100-S700; S100, installing a light source (21) on one side of a mode heat exchanger of a rotary air preheater; installing an optical signal receiving and processing component on a side of the mode heat exchanger opposite to the light source (21) and directly facing the light source (21); S200, starting the light source (21) so that the light source (21) emits a light signal to the fan-shaped heat storage element (10), so that the light signal can be transmitted in the ventilation hole of the fan-shaped heat storage element (10); S300, rotating the mode heat exchanger so that the light source (21) is directly opposite to one of the fan-shaped heat storage elements (10); S400, detecting the intensity of the optical signal passing through the fan-shaped heat storage element (10) by means of the optical signal receiving and processing component, and comparing and calculating the intensity of the optical signal with the intensity of the conduction optical signal to obtain the flow performance of the fan-shaped heat storage element (10); S500, continue to rotate the mode heat exchanger so that the light source (21) is directly opposite to the next fan-shaped heat storage element (10); S600, repeating the above steps S400-S500 until the flow performance of each of the fan-shaped heat storage elements (10) is obtained; S700, obtaining the flow performance of the model heat exchanger according to the flow performance of each of the fan-shaped heat storage elements (10).

9. The method for detecting flow performance according to claim 8, characterized in that: The flow performance of the fan-shaped heat storage element (10) is obtained by comparing and calculating the intensity of the light signal with the intensity of the conduction light signal, specifically: The percentage obtained by dividing the intensity of the light signal by the intensity of the conduction light signal is used as the flow performance of the fan-shaped heat storage element (10).

10. The flow performance detection method according to claim 8, characterized in that: After step S700, the flow performance detection method further includes: The flow performance of the mode heat exchanger is displayed via a display.

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