Ultrasonic flowmeter device for smoke in large flue

Abstract

The utility model provides a large flue gas ultrasonic flowmeter device, which is characterized in that a detection flange opening is arranged on the pipe wall of a flue, the device comprises a first fixed cylinder, a second fixed cylinder and a third fixed cylinder, and the first fixed cylinder and the third fixed cylinder are respectively connected with the detection flange opening; the second fixing cylinder is arranged between the first fixing cylinder and the third fixing cylinder and is connected with the first fixing cylinder and the third fixing cylinder through connecting rods; the device further comprises two ultrasonic probe assemblies, one end of one ultrasonic probe assembly is connected with the first fixing cylinder, and the other end of the ultrasonic probe assembly is connected with the second fixing cylinder. One end of the other ultrasonic probe assembly is connected with the second fixing cylinder, the other end of the other ultrasonic probe assembly is connected with the third fixing cylinder, and a signal isolation plate is arranged in the second fixing cylinder. The propagation distance of ultrasonic waves between the transmitting end and the receiving end is reduced by arranging the multiple groups of ultrasonic probe assemblies, the influence of ultrasonic attenuation on ultrasonic wave receiving is weakened, and the detection precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of measuring equipment technology, and in particular to an ultrasonic flow meter device for large flue gas. Background Technology

[0002] Currently, there are two main methods for calculating greenhouse gas emissions internationally: the accounting method and the measurement method. The accounting method primarily calculates greenhouse gas emissions by measuring the amount of fuel burned, while the measurement method directly measures emissions using a CEMS (Continuous Electromagnetic Monitoring System). The CEMS method directly measures parameters such as flue gas velocity, CO2 concentration, and humidity to obtain greenhouse gas emissions, with flue gas velocity directly affecting the carbon emission measurement results. As my country's carbon trading market enters its full implementation phase, data measured using the CEMS system is expected to become an effective reference for carbon emission monitoring. Therefore, accurate measurement of flue gas velocity is of great significance for carbon emission monitoring and carbon emission trading.

[0003] Flue gas velocity testing typically employs methods such as Pitot tube flow meters, matrix flow meters, thermal flow meters, and ultrasonic flow meters. Among these, ultrasonic flow meters measure gas velocity by exploiting the time difference in ultrasonic pulse delay. The transmitting and receiving devices are installed on opposite sides of the measuring pipe, at a specific angle to the gas flow direction. Due to the gas velocity, there is a time difference in the propagation of ultrasonic waves in the forward and reverse directions. Therefore, based on this time difference, the pipe diameter, and the installation location, the gas velocity can be calculated, and consequently, the gas flow rate.

[0004] Ultrasonic signals attenuate during propagation. If the flue is too large (diameter greater than 6m), the ultrasonic signal may be weak, and the receiving device may not receive a signal, leading to problems such as inability to detect or inaccurate measurement. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a large flue gas ultrasonic flow meter device, which reduces the propagation distance of ultrasonic waves between the transmitting and receiving ends by setting multiple sets of probes, weakens the impact of ultrasonic wave attenuation and flue vibration on ultrasonic wave reception, and improves detection accuracy.

[0006] This utility model is implemented as follows:

[0007] This utility model provides an ultrasonic flow meter device for flue gas in a large flue. Two detection flange ports are provided on the pipe wall of the flue. The device includes a first fixed cylinder, a second fixed cylinder and a third fixed cylinder, and the first fixed cylinder and the third fixed cylinder are respectively connected to the two detection flange ports.

[0008] The second fixed cylinder is disposed between the first fixed cylinder and the third fixed cylinder, and is connected to the first fixed cylinder and the third fixed cylinder via a connecting rod;

[0009] The device also includes two sets of ultrasonic probe assemblies, one end of which is connected to the first fixed cylinder and the other end of which is connected to the second fixed cylinder;

[0010] One end of the other set of ultrasonic probe assemblies is connected to the second fixed cylinder, and the other end is connected to the third fixed cylinder. The second fixed cylinder is provided with a signal isolation plate for isolating the two sets of ultrasonic probe assemblies.

[0011] Furthermore, the two sets of ultrasonic probe assemblies are divided into a first ultrasonic probe assembly and a second ultrasonic probe assembly. The first ultrasonic probe assembly includes a first receiving probe and a first transmitting probe. The first receiving probe is connected to a first fixed cylinder, and the first transmitting probe is connected to a second fixed cylinder.

[0012] The second ultrasonic probe assembly includes a second receiving probe and a second transmitting probe. The second receiving probe is connected to a second fixed cylinder, and the second transmitting probe is connected to a third fixed cylinder.

[0013] Furthermore, the signal isolation plate is disposed between the first transmitting probe and the second receiving probe.

[0014] Furthermore, each of the three fixed cylinders has a circular hole at its center, through which the first transmitting probe and the second transmitting probe transmit pulses to the corresponding receiving probe.

[0015] Furthermore, the two detection flange ports are divided into a first detection flange port and a second detection flange port. The first fixed cylinder is installed in the first detection flange port through a first connecting assembly, and the third fixed cylinder is installed in the second detection flange port through a second connecting assembly.

[0016] Furthermore, the first connecting assembly includes a first fixing flange connected to the first fixing cylinder, a screw is connected to the side of the first fixing flange away from the first fixing cylinder, the end of the screw extends to the outside of the first detection flange opening and is connected to a fixing nut for locking the first fixing flange.

[0017] The screw is also fitted with a cylindrical sealing sleeve. The outer wall of the sealing sleeve is in contact with the first detection flange. The sealing sleeve also has a flange portion. When the first fixed flange is fixed, the flange portion is located between the first fixed flange and the inner wall of the flue.

[0018] The second connecting assembly includes a second fixed flange connected to the third fixed cylinder. The second fixed flange is fixedly installed at the second detection flange opening by bolts. A sealing gasket for sealing the gap between the second fixed flange and the second detection flange opening is provided on the inner side of the second fixed flange.

[0019] Furthermore, each of the connecting rods has a threaded section at its end, and the three fixing cylinders are provided with countersunk holes. The threaded section extends through the countersunk holes into the corresponding fixing cylinder and is fixed by a lock nut.

[0020] Furthermore, each of the connecting rods is provided with a central hole for the data transmission cable of the ultrasonic probe assembly to pass through, and the central hole extends through the connecting rod along the axial direction of the connecting rod.

[0021] A wire hole is provided at the center of the second fixed flange. The data transmission cable of the ultrasonic probe assembly is passed through the wire hole to the outside of the flue and connected to the main unit of the ultrasonic flow meter.

[0022] The advantages of this utility model are:

[0023] 1. By setting up multiple sets of ultrasonic probe components, the propagation distance of ultrasonic waves between the transmitting and receiving ends is reduced, the impact of ultrasonic wave attenuation on ultrasonic wave reception is weakened, and the detection accuracy is improved.

[0024] 2. By connecting the three fixed cylinders into one unit through the connecting rod, when the flue vibrates due to the blower, the transmitting and receiving ends in the same ultrasonic probe assembly move as a whole without relative displacement, thereby reducing the impact of flue vibration on the transmission and reception of ultrasonic pulses by the probe and further improving the detection accuracy. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a schematic diagram of the structure of an ultrasonic flow meter device for large flue gas in a flue according to the present invention.

[0027] Figure 2 This is a schematic diagram of the connection structure between the connecting rod and the fixed cylinder of this utility model.

[0028] Figure 3 This is a schematic diagram of the connection structure of the second fixed cylinder, the first transmitting probe, and the second receiving probe of this utility model.

[0029] Explanation of the labels in the diagram:

[0030] 1. Flue; 101. First inspection flange; 102. Second inspection flange; 2. First fixed cylinder; 3. Second fixed cylinder; 31. Cylinder body; 32. First flange; 33. Second flange; 4. Third fixed cylinder; 5. Connecting rod; 51. Threaded section; 52. Center hole; 6. Ultrasonic probe assembly; 61. First ultrasonic probe assembly; 611. First receiving probe; 612. First transmitting probe; 62. Second ultrasonic probe assembly; 621. Second receiving probe; 622. Second transmitting probe; 7. Signal isolation plate; 8. Round hole; 9. First connecting assembly; 91. First fixed flange; 92. Screw; 93. Fixing nut; 94. Sealing sleeve; 941. Flange; 10. Second connecting assembly; 1001. Second fixed flange; 1002. Sealing gasket; 11. Countersunk hole; 12. Locking nut; 13. Wire hole; 14. Main unit. Detailed Implementation

[0031] Please see Figures 1 to 3 This utility model provides an ultrasonic flow meter device for flue gas in a large flue. Two detection flange ports are provided on the pipe wall of the flue 1. The device includes a first fixed cylinder 2, a second fixed cylinder 3 and a third fixed cylinder 4. The first fixed cylinder 2 and the third fixed cylinder 4 are respectively connected to the two detection flange ports.

[0032] The second fixing cylinder 3 is disposed between the first fixing cylinder 2 and the third fixing cylinder 4, and is connected to the first fixing cylinder 2 and the third fixing cylinder 4 via a connecting rod 5; the three fixing cylinders (first fixing cylinder 2, second fixing cylinder 3 and third fixing cylinder 4) are connected as a whole via the connecting rod 5;

[0033] The device also includes two sets of ultrasonic probe assemblies 6, one end of which is connected to the first fixed cylinder 2 and the other end is connected to the second fixed cylinder 3.

[0034] One end of the other set of ultrasonic probe assemblies 6 is connected to the second fixed cylinder 3, and the other end is connected to the third fixed cylinder 4. The second fixed cylinder 3 is provided with a signal isolation plate 7 for isolating the two sets of ultrasonic probe assemblies 6.

[0035] It is worth mentioning that the large flue in this utility model refers to a flue with a diameter of 6m-10m. When this device is fixed inside the flue 1, the second fixing cylinder 3 is located in the middle of the flue 1. In use, the two sets of ultrasonic probe assemblies 6 measure the local flue gas velocity respectively. The data is transmitted to the host 14 of the ultrasonic flow meter for processing to obtain the overall flue gas velocity.

[0036] Specifically, the two sets of ultrasonic probe assemblies 6 are divided into a first ultrasonic probe assembly 61 and a second ultrasonic probe assembly 62. The first ultrasonic probe assembly 61 includes a first receiving probe 611 and a first transmitting probe 612. The first receiving probe 611 is connected to the first fixed cylinder 2, and the first transmitting probe 612 is connected to the second fixed cylinder 3.

[0037] The second ultrasonic probe assembly 62 includes a second receiving probe 621 and a second transmitting probe 622. The second receiving probe 621 is connected to the second fixed cylinder 3, and the second transmitting probe 622 is connected to the third fixed cylinder 4.

[0038] The first receiving probe 611 is fixed inside the first fixed cylinder 2 by screws; the first transmitting probe 612 and the second receiving probe 621 are respectively fixed inside the second fixed cylinder 3 by two sets of screws, and a signal isolation plate 7 is provided between the first transmitting probe 612 and the second receiving probe 621; the second transmitting probe 622 is fixed inside the third fixed cylinder 4 by screws.

[0039] like Figure 3 As shown, the second fixed cylinder 3 includes a cylindrical body 31 with open ends. A signal isolation plate 7 is disposed in the middle of the cylindrical body 31. The two ends of the cylindrical body 31 are detachably connected to a first flange 32 and a second flange 33, respectively. A first transmitting probe 612 is installed inside the first flange 32 by screws, and a second receiving probe 621 is installed inside the second flange 33 by screws. One end of several connecting rods 5 is divided into two groups, and the two groups of connecting rods 5 are respectively connected to the first flange 32 and the second flange 33.

[0040] Specifically, the signal isolation plate 7 is disposed between the first transmitting probe 612 and the second receiving probe 621.

[0041] Specifically, a round hole 8 is provided at the center of each of the three fixing cylinders. More specifically, a round hole 8 is provided at each end of the second fixing cylinder 3, a round hole 8 is also provided on the side of the first fixing cylinder 2 facing the second fixing cylinder 3, and another round hole 8 is also provided on the side of the third fixing cylinder 4 facing the second fixing cylinder 3.

[0042] The first transmitting probe 612 and the second transmitting probe 622 transmit pulses through the circular hole 8 to the corresponding receiving probe. The ultrasonic wave emitted by the first transmitting probe 612 is received by the first receiving probe 611, and the ultrasonic wave emitted by the second transmitting probe 622 is received by the second receiving probe 621.

[0043] Specifically, the two detection flange ports are divided into a first detection flange port 101 and a second detection flange port 102. The first fixing cylinder 2 is installed in the first detection flange port 101 through a first connecting assembly 9, and the third fixing cylinder 4 is installed in the second detection flange port 102 through a second connecting assembly 10. The diameter of the first detection flange port 101 is smaller than that of the second detection flange port 102.

[0044] Specifically, the first connecting assembly 9 includes a first fixing flange 91 connected to the first fixing cylinder 2. The first fixing flange 91 is connected to the first fixing cylinder 2 by a set of bolts. A screw 92 is connected to the side of the first fixing flange 91 away from the first fixing cylinder 2. The end of the screw 92 extends to the outside of the first detection flange port 101 and is connected to a fixing nut 93 for locking the first fixing flange 91.

[0045] The screw 92 is also fitted with a cylindrical sealing sleeve 94. The outer wall of the sealing sleeve 94 is in contact with the first detection flange port 101. The sealing sleeve 94 also has a flange portion 941. When the first fixed flange 91 is fixed, the flange portion 941 is located between the first fixed flange 91 and the inner wall of the flue 1.

[0046] The second connecting assembly 10 includes a second fixing flange 1001 connected to the third fixing cylinder 4. The second fixing flange 1001 is connected to the third fixing cylinder 4 by another set of bolts. The second fixing flange 1001 is fixedly installed at the second detection flange port 102 by another set of bolts. A sealing gasket 1002 for sealing the gap between the second fixing flange 1001 and the second detection flange port 102 is provided on the inner side of the second fixing flange 1001.

[0047] Specifically, each of the connecting rods 5 has a threaded section 51 at its end, and the three fixed cylinders are provided with countersunk holes 11. The threaded section 51 extends through the countersunk holes 11 into the corresponding fixed cylinder and is fixed by a lock nut 12.

[0048] Specifically, each of the connecting rods 5 is provided with a central hole 52 for the data transmission cable of the ultrasonic probe assembly 6 to pass through, and the central hole 52 extends through the connecting rod 5 along the axial direction of the connecting rod 5;

[0049] A wire hole 13 is provided at the center of the second fixed flange 1001. The data transmission cable of the ultrasonic probe assembly 6 is passed through the wire hole 13 to the outside of the flue 1 and connected to the main unit 14 of the ultrasonic flow meter.

[0050] The data transmission cable of the first receiving end passes through the central hole 52 into the second fixed cylinder 3, then through the signal isolation plate 7, and through the central hole 52 on another connecting rod 5 into the third fixed cylinder 4;

[0051] The data transmission cable of the first transmitting probe 612 passes through the signal isolation plate 7, and then enters the third fixed cylinder 4 through the center hole 52 on the connecting rod 5;

[0052] The data transmission cable of the second receiving end passes through the central hole 52 and enters the interior of the third fixed cylinder 4;

[0053] The three data transmission cables mentioned above, together with the data transmission cable of the second transmitting probe 622, extend through the wire hole 13 to the outside of the flue 1 and are connected to the main unit 14 of the ultrasonic flow meter.

[0054] One specific application of this utility model is:

[0055] The first receiving probe 611 is fixed inside the first fixed cylinder 2 with screws; the first transmitting probe 612 and the second receiving probe 621 are respectively fixed inside the second fixed cylinder 3 with two sets of screws, and a signal isolation plate 7 is provided between the first transmitting probe 612 and the second receiving probe 621; the second transmitting probe 622 is fixed inside the third fixed cylinder 4 with screws. At the same time, the first fixed cylinder 2, the second fixed cylinder 3 and the third fixed cylinder 4 are connected into one unit by several connecting rods 5.

[0056] A first fixing flange 91 is installed at the end of the first fixing cylinder 2, and a sealing sleeve 94 is installed on the outside of the screw 92. The third fixing cylinder 4 is connected to the second fixing flange 1001, and a sealing gasket 1002 is installed on the inside of the second fixing flange 1001.

[0057] Subsequently, the device is inserted into the flue 1 through the second detection flange port 102, and the screw 92 is passed through the first detection flange port 101. The second fixing flange 1001 is fixed at the second detection flange port 102 using several bolts to secure one end of the device; the other end of the device is secured by tightening the locking nut 93. This ensures the entire device is securely installed inside the flue 1.

[0058] When this device is fixed inside the flue 1, the second fixing cylinder 3 is located in the middle of the flue 1. In use, the two sets of ultrasonic probe assemblies 6 measure the local flue gas velocity respectively, and the data is transmitted to the main unit 14 of the ultrasonic flow meter for processing to obtain the overall flue gas velocity.

[0059] The advantages of this invention are as follows: By setting multiple sets of ultrasonic probe assemblies, the propagation distance of ultrasonic waves between the transmitting and receiving ends is reduced, thus weakening the impact of ultrasonic wave attenuation on ultrasonic wave reception and improving detection accuracy. By connecting the three fixed cylinders into a single unit with connecting rods, when the flue vibrates due to the blower's airflow, the transmitting and receiving ends within the same set of ultrasonic probe assemblies move as a whole without relative displacement, thereby reducing the impact of flue vibration on the probe's transmission and reception of ultrasonic pulses, further improving detection accuracy.

[0060] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A large flue gas ultrasonic flow meter device, characterized in that: Two detection flange ports are provided on the pipe wall of the flue. The device includes a first fixed cylinder, a second fixed cylinder and a third fixed cylinder, and the first fixed cylinder and the third fixed cylinder are respectively connected to the two detection flange ports. The second fixed cylinder is disposed between the first fixed cylinder and the third fixed cylinder, and is connected to the first fixed cylinder and the third fixed cylinder via a connecting rod; The device also includes two sets of ultrasonic probe assemblies, one end of which is connected to the first fixed cylinder and the other end of which is connected to the second fixed cylinder; One end of the other set of ultrasonic probe assemblies is connected to the second fixed cylinder, and the other end is connected to the third fixed cylinder. The second fixed cylinder is provided with a signal isolation plate for isolating the two sets of ultrasonic probe assemblies.

2. The ultrasonic flow meter device for large flue gas as described in claim 1, characterized in that: The two sets of ultrasonic probe assemblies are divided into a first ultrasonic probe assembly and a second ultrasonic probe assembly. The first ultrasonic probe assembly includes a first receiving probe and a first transmitting probe. The first receiving probe is connected to a first fixed cylinder, and the first transmitting probe is connected to a second fixed cylinder. The second ultrasonic probe assembly includes a second receiving probe and a second transmitting probe. The second receiving probe is connected to a second fixed cylinder, and the second transmitting probe is connected to a third fixed cylinder.

3. The ultrasonic flow meter device for large flue gas as described in claim 2, characterized in that: The signal isolation plate is positioned between the first transmitting probe and the second receiving probe.

4. The ultrasonic flow meter device for large flue gas as described in claim 2, characterized in that: Each of the three fixed cylinders has a circular hole at its center, through which the first transmitting probe and the second transmitting probe transmit pulses to the corresponding receiving probe.

5. The ultrasonic flow meter device for large flue gas as described in any one of claims 1 to 4, characterized in that: The two detection flange ports are divided into a first detection flange port and a second detection flange port. The first fixed cylinder is installed in the first detection flange port through a first connecting assembly, and the third fixed cylinder is installed in the second detection flange port through a second connecting assembly.

6. The ultrasonic flow meter device for large flue gas as described in claim 5, characterized in that: The first connecting assembly includes a first fixing flange connected to a first fixing cylinder. A screw is connected to the side of the first fixing flange away from the first fixing cylinder. The end of the screw extends to the outside of the first detection flange opening and is connected to a fixing nut for locking the first fixing flange. The screw is also fitted with a cylindrical sealing sleeve. The outer wall of the sealing sleeve is in contact with the first detection flange. The sealing sleeve also has a flange portion. When the first fixed flange is fixed, the flange portion is located between the first fixed flange and the inner wall of the flue. The second connecting assembly includes a second fixed flange connected to the third fixed cylinder. The second fixed flange is fixedly installed at the second detection flange opening by bolts. A sealing gasket for sealing the gap between the second fixed flange and the second detection flange opening is provided on the inner side of the second fixed flange.

7. The ultrasonic flow meter device for large flue gas as described in claim 6, characterized in that: Each of the connecting rods has a threaded section at its end, and the three fixed cylinders are provided with countersunk holes. The threaded section extends through the countersunk holes into the corresponding fixed cylinder and is fixed by a lock nut.

8. The ultrasonic flow meter device for large flue gas as described in claim 7, characterized in that: Each of the connecting rods has a central hole for the transmission cable of the ultrasonic probe assembly, and the central hole extends through the connecting rod along the axial direction of the connecting rod. A wire hole is provided at the center of the second fixed flange. The data transmission cable of the ultrasonic probe assembly is passed through the wire hole to the outside of the flue and connected to the main unit of the ultrasonic flow meter.

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