Internal and external barrel circulating air cooling device of flue gas ultrasonic current meter

Abstract

The utility model relates to the technical field of stationary pollution source flue gas ultrasonic velocimeters, and discloses an inner and outer barrel circulating air cooling device of a flue gas ultrasonic velocimeter, which comprises a sampling inner pipe body, a mounting seat is connected inside the lower end of the sampling inner pipe body, and an ultrasonic transducer is embedded in the middle of the lower end of the mounting seat. An air inlet is connected to one side of the upper part of the sampling inner pipe body, an electric control box is connected to the upper end of the sampling inner pipe body, a first flange plate is welded to one side of the outer end of the sampling inner pipe body, and a sampling outer pipe body is welded to the lower end of the first flange plate; by arranging the inner layer and the outer layer, installation and sealing of the ultrasonic transducer can be guaranteed, circulating air cooling of the inner barrel and the outer barrel can be formed, circulating air cooling can be achieved by controlling the air inlet amount of the draught fan, the requirement for the normal working temperature of the ultrasonic transducer is met, and measurement accuracy is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of ultrasonic flowmeters for flue gas with fixed pollution sources, in particular to an inner and outer barrel circulating air cooling device for a flue gas ultrasonic flowmeter. Background Art

[0002] my country's requirements for environmental protection are becoming increasingly stringent, and the environmental protection department has very strict requirements for the continuous monitoring system of flue gas emissions from fixed pollution sources. Flue gas emission flow is an important parameter monitored by the environmental protection department and is used to calculate the total amount of pollutant emissions. Due to the turbulent characteristics of the flue gas flow field in the flue, the accuracy of traditional flow measurement (such as the Pitot tube method) cannot meet the regulatory requirements, and the online ultrasonic flue gas flow meter that uses advanced ultrasonic flow measurement technology combined with the ultrasonic time difference measurement principle is more suitable for flue gas emission flow measurement.

[0003] The online ultrasonic flue gas velocity meter is an instrument that uses the ultrasonic time difference method to measure the flue gas velocity. The ultrasonic transceiver is installed on both sides of the measuring flue at a certain angle to the gas flow direction. There is a certain time difference when the ultrasonic wave propagates in the gas flow direction and the reverse flow direction. The flow rate of the gas in the flue is calculated by the propagation time difference of the ultrasonic wave, and the volume flow rate of the flue gas is calculated in combination with the cross-sectional area of ​​the flue. The flue gas velocity meter using this method is suitable for the field of low-velocity exhaust gas monitoring. Compared with the Pitot tube method for measuring flue gas velocity, its advantage is that it can still accurately measure in the low velocity range, which can better meet the needs of environmental monitoring at this stage.

[0004] However, the ambient temperature of the flue at the fixed pollution source site is generally below 150℃-200℃. For example, the exhaust temperature is stipulated in the GB / T 15317-2009 "Energy-saving Monitoring of Coal-fired Industrial Boilers" standard, 2.5≤D (evaporation capacity) <5, exhaust temperature ≤230℃, D≥50 exhaust temperature ≤150℃. The normal working temperature of the ultrasonic transducer is generally below 70-80℃. Therefore, it is particularly important to design a reasonable cooling system to make the transducer installed on the flue work normally. For this purpose, an inner and outer barrel circulating air cooling device of a flue gas ultrasonic flowmeter is designed. Utility Model Content

[0005] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides an inner and outer barrel circulating air cooling device for a flue gas ultrasonic flowmeter, which effectively solves the problems raised in the above background.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an inner and outer barrel circulating air cooling device for a flue gas ultrasonic flowmeter, comprising a sampling inner tube body, a mounting seat is connected to the interior of the lower end of the sampling inner tube body, an ultrasonic transducer is embedded in the middle of the lower end of the mounting seat, a pressure ring is sleeved on the outer end of the lower part of the ultrasonic transducer, the pressure ring is connected to the mounting seat through the ultrasonic transducer through a first connecting bolt, an air inlet is connected to one side of the upper part of the sampling inner tube body, an electric control box is connected to the upper end of the sampling inner tube body, a first flange is welded to one side of the outer end of the sampling inner tube body, a sampling outer tube body is welded to the lower end of the first flange, a gap is formed between the sampling outer tube body and the sampling inner tube body, a vent hole is opened at the upper end of the first flange to facilitate the air outlet of the gap, a seat sleeve is sleeved on the outer part of the sampling outer tube body, a second flange is welded on the upper end of the seat sleeve, the second flange is connected to the first flange by fixing bolts, a fixing ring is welded on the outer wall of the sampling inner tube body, a rain cap is connected to the outside of the fixing ring, and the rain cap is sleeved on the outside of the first flange and the second flange;

[0007] A probe partition is welded to the lower end of the sampling outer tube body, a probe rod is installed at one end of the probe partition, a temperature sensor is installed at the lower end of the probe rod, a sealing pressure plate is connected to the lower end of the probe rod and below the probe partition, the sealing pressure plate is connected to the probe partition by a second connecting bolt, and a sealing ring is provided between the sealing pressure plate and the probe partition.

[0008] Preferably, a first heat-resistant rubber pad is provided between the contact surface between the upper end of the ultrasonic transducer and the lower end of the mounting seat, and between the contact surface between the lower end of the ultrasonic transducer and the upper end of the pressure ring.

[0009] Preferably, a second heat-resistant rubber pad is provided between the contact surface between the lower end of the electric control box and the upper end of the sampling inner tube body.

[0010] Preferably, the outer wall of the seat sleeve is circumferentially connected with a locking bolt fixed to the inspected pipe.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model can ensure the installation and sealing of the ultrasonic transducer by setting the inner and outer layers, and can also form circulating air cooling of the inner and outer barrels. By controlling the air intake volume of the fan, circulating air cooling can be achieved to meet the normal working temperature of the ultrasonic transducer and ensure the accuracy of measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0014] In the attached picture:

[0015] Figure 1It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a cross-sectional view of the utility model;

[0017] Figure 3 For this utility model Figure 2 A schematic diagram of a local enlarged structure;

[0018] In the figure: 1. sampling inner tube body; 2. mounting seat; 3. ultrasonic transducer; 4. pressure ring; 5. first connecting bolt; 6. air inlet; 7. electric control box; 8. first flange; 9. sampling outer tube body; 10. gap; 11. seat cover; 12. second flange; 13. fixing bolt; 14. fixing ring; 15. rain cap; 16. probe partition; 17. probe rod; 18. temperature sensor; 19. sealing pressure plate; 20. second connecting bolt; 21. sealing ring; 22. first heat-resistant rubber pad; 23. second heat-resistant rubber pad; 24. locking bolt. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0020] Embodiment 1, by Figure 1-Figure 3 The utility model includes a sampling inner tube body 1, a mounting seat 2 is connected to the inside of the lower end of the sampling inner tube body 1, an ultrasonic transducer 3 is embedded in the middle of the lower end of the mounting seat 2, a pressure ring 4 is sleeved on the outer end of the lower part of the ultrasonic transducer 3, and the pressure ring 4 is connected to the mounting seat 2 through the first connecting bolt 5 through the ultrasonic transducer 3, an air inlet 6 is connected to one side of the upper part of the sampling inner tube body 1, an electric control box 7 is connected to the upper end of the sampling inner tube body 1, a first flange 8 is welded to one side of the outer end of the sampling inner tube body 1, and a sampling outer Tube body 9, a gap 10 is formed between the sampling outer tube body 9 and the sampling inner tube body 1, a vent hole is opened at the upper end of the first flange 8 to facilitate the air out of the gap 10, a seat sleeve 11 is sleeved on the outside of the sampling outer tube body 9, a second flange 12 is welded on the upper end of the seat sleeve 11, the second flange 12 is connected to the first flange 8 by a fixing bolt 13, a fixing ring 14 is welded on the outer wall of the sampling inner tube body 1, a rain cap 15 is connected to the outside of the fixing ring 14, and the rain cap 15 is sleeved on the outside of the first flange 8 and the second flange 12;

[0021] A probe diaphragm 16 is welded to the lower end of the sampling outer tube 9, a probe rod 17 is installed at one end of the probe diaphragm 16, a temperature sensor 18 is installed at the lower end of the probe rod 17, which is used to detect the temperature of the ultrasonic transducer 3, and a sealing plate 19 is connected to the lower end of the probe rod 17 and below the probe diaphragm 16. The sealing plate 19 is connected to the probe diaphragm 16 through a second connecting bolt 20, and a sealing ring 21 is provided between the sealing plate 19 and the probe diaphragm 16;

[0022] A first heat-resistant rubber pad 22 is provided between the upper end of the ultrasonic transducer 3 and the contact surface of the lower end of the mounting seat 2, and between the lower end of the ultrasonic transducer 3 and the contact surface of the upper end of the pressure ring 4; a second heat-resistant rubber pad 23 is provided between the lower end of the electric control box 7 and the contact surface of the upper end of the sampling inner tube 1;

[0023] The outer wall circumference of the seat sleeve 11 is connected with a locking bolt 24 fixed to the detected pipeline.

[0024] Working principle: When in use, the device is embedded and installed at the end of the detected pipeline so that the seat sleeve 11 extends into the interior of the detected pipeline and is locked and fixed with the detected pipeline by the locking bolt 24. During the detection process, the air volume of the sampling fan enters the device from the air inlet 6, and the high-temperature gas is replaced inside the device. One end of the high-temperature gas sampling inner tube body 1 enters the gap 10 formed between the sampling inner tube body 1 and the sampling outer tube body 9, and then flows from the vent hole connected to the upper end of the gap 10, thereby cooling the high-temperature gas to reach the normal working temperature of the ultrasonic transducer 3 and ensure the accuracy of the measurement.

Claims

1. An inner and outer barrel circulating air cooling device for a flue gas ultrasonic flowmeter, comprising a sampling inner tube body (1), characterized in that: The lower end of the sampling inner tube body (1) is internally connected to a mounting seat (2), an ultrasonic transducer (3) is embedded in the middle of the lower end of the mounting seat (2), a pressure ring (4) is sleeved on the outer end of the lower part of the ultrasonic transducer (3), the pressure ring (4) passes through the ultrasonic transducer (3) and is connected to the mounting seat (2) via a first connecting bolt (5), an air inlet (6) is connected to one side of the upper part of the sampling inner tube body (1), an electric control box (7) is connected to the upper end of the sampling inner tube body (1), a first flange (8) is welded to one side of the outer end of the sampling inner tube body (1), a sampling outer tube body (9) is welded to the lower end of the first flange (8), and the sampling outer tube body (9) is welded to the lower end of the first flange (8). A gap (10) is formed between the body (9) and the sampling inner tube body (1); a vent hole is provided at the upper end of the first flange (8) to facilitate the venting of air through the gap (10); a seat sleeve (11) is sleeved on the outside of the sampling outer tube body (9); a second flange (12) is welded to the upper end of the seat sleeve (11); the second flange (12) and the first flange (8) are connected via fixing bolts (13); a fixing ring (14) is welded to the outer wall of the sampling inner tube body (1); a rain cap (15) is connected to the outside of the fixing ring (14); and the rain cap (15) is sleeved on the outside of the first flange (8) and the second flange (12); A probe baffle (16) is welded to the lower end of the sampling outer tube (9), a probe rod (17) is mounted on one end of the probe baffle (16), a temperature sensor (18) is mounted on the lower end of the probe rod (17), a sealing pressure plate (19) is connected to the lower end of the probe rod (17) and below the probe baffle (16), the sealing pressure plate (19) is connected to the probe baffle (16) via a second connecting bolt (20), and a sealing ring (21) is provided between the sealing pressure plate (19) and the probe baffle (16).

2. The inner and outer barrel circulating air cooling device of a flue gas ultrasonic flowmeter according to claim 1 is characterized in that: A first heat-resistant rubber pad (22) is provided between the contact surface of the upper end of the ultrasonic transducer (3) and the lower end of the mounting seat (2), and between the contact surface of the lower end of the ultrasonic transducer (3) and the upper end of the pressure ring (4).

3. The inner and outer barrel circulating air cooling device of a flue gas ultrasonic flowmeter according to claim 1 is characterized in that: A second heat-resistant rubber pad (23) is provided between the lower end of the electric control box (7) and the contact surface of the upper end of the sampling inner tube body (1).

4. The inner and outer barrel circulating air cooling device of a flue gas ultrasonic flowmeter according to claim 1 is characterized in that: The outer wall of the seat sleeve (11) is circumferentially connected with a locking bolt (24) that is fixed to the pipeline to be inspected.

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