Pitot flowmeter for high-temperature and high-pressure pipeline

Abstract

The utility model discloses a pitot flow meter for a high-temperature and high-pressure pipeline, which belongs to the technical field of industrial flow and flow velocity measurement and comprises a differential pressure transmitter, a connecting piece, a mounting piece, a cooling device, a mounting pipe, a pressure inlet pipeline, a first connecting pipe and an adjusting valve, a through hole is formed in the side wall of the mounting pipe, and the bottom end of the first connecting pipe is mounted in the through hole. The pressure inlet pipeline is inserted into the first connecting pipe, the cooling device is installed at the top end of the pressure inlet pipeline, the bottom end of the installation piece is inserted into the upper end of the cooling device, the top end of the installation piece is connected with the connecting piece, the connecting block is installed at the upper end of the connecting piece, and the adjusting valves are installed in the connecting piece. A wire is inserted into the bottom end of the differential pressure transmitter, and the other end of the wire is connected with a flow calculator. The problem that in the prior art, due to the fact that an existing flowmeter is damaged for a short time under the influence of high temperature and high pressure, potential safety hazards are likely to be caused is solved. The service life of the flowmeter is prolonged, and the detection neutral period is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial flow rate and velocity measurement, in particular to a pitot flowmeter used in high-temperature and high-pressure pipelines. Background Art

[0002] According to the ideal gas state equation, when the flow volume is the same, the gas volume and the amount of substance do not change. At this time, the gas pressure is proportional to the temperature. If the gas pressure is higher, the gas temperature will also be higher.

[0003] The working temperature of the vaporization cooling water in a steel plant is generally greater than 200°C, while the heat of the coal gas in the coke oven is generally around 170°C, and the high-temperature gas is generally accompanied by a high-pressure environment. Although this high-pressure environment is easy to detect, the existing flow meter will be damaged in a short time due to working in this high-temperature environment, and production is continuous. This means that if the flow meter is not replaced or the gas in the pipeline is not cooled, the gas flow cannot be detected, so it is impossible to determine whether the flow will exceed the standard, thereby causing safety hazards. However, if the flow meter is replaced, production must be stopped to prevent toxic gas leakage and pollution of the environment, and stopping production for a period of time will reduce the company's efficiency.

[0004] Therefore, how to provide a pitot flowmeter for high-temperature and high-pressure pipelines to solve the problem that existing flowmeters are prone to failure when detecting high-temperature and high-pressure gases is a technical problem that needs to be urgently solved by technical personnel in this field. Utility Model Content

[0005] To this end, the utility model provides a pitot flowmeter for high-temperature and high-pressure pipelines to solve the problem in the prior art that the existing flowmeters may be damaged in a short period of time under the influence of high temperature and high pressure, which may easily cause safety hazards.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model discloses a pitot flowmeter for high temperature and high pressure pipelines, comprising:

[0008] A mounting pipe, mounted in the steam pipeline, a through hole being opened on a side wall of the mounting pipe, and first flanges being mounted on left and right sides of the mounting pipe;

[0009] A first connecting pipe, the bottom end of which is installed in the through hole, and a second flange is provided on the top end of the first connecting pipe;

[0010] A pressure inlet pipe is inserted into the first connecting pipe, and a bottom end of the pressure inlet pipe is arranged inside the steam pipeline;

[0011] A cooling device installed at the top of the pressure inlet pipe;

[0012] A mounting member, the bottom end of which is inserted into the upper end of the cooling device, the top end of the mounting member is connected to a connecting member, and the upper end of the connecting member is installed with a connecting block;

[0013] A plurality of regulating valves installed in the connecting piece;

[0014] A differential pressure transmitter is inserted into the front end of the connection block;

[0015] Wherein, a wire is inserted into the bottom end of the differential pressure transmitter, and the other end of the wire is connected to a flow calculator.

[0016] In a possible implementation, the temperature reduction device includes:

[0017] A mounting block, the lower end of which is mounted on the upper part of the pressure inlet pipe;

[0018] A plurality of lifting blocks are arranged on the upper end of the mounting block, and a slide groove is provided inside the lifting blocks;

[0019] A moving block, arranged at the upper end of the lifting block, wherein the sliding groove is provided inside the moving block;

[0020] A transmission rod is fixed to the upper ends of the mounting block and the lifting block, and the transmission rod is transmission-connected in the slide groove;

[0021] A plurality of annular plates are mounted on the inner surfaces of the moving block and the lifting block.

[0022] In a possible implementation, a telescopic kit is disposed inside the plurality of circular plates.

[0023] In a possible implementation, the pressure inlet pipeline includes:

[0024] The tube body is provided with a baffle plate inside, a positive pressure passage and a negative pressure passage are formed between the baffle plate and the tube body, and a rectifying groove is provided on the outer surface of the tube body;

[0025] A V-shaped pressure-taking head is installed at the bottom end of the tube body, and pressure-taking holes are respectively opened on two surfaces of the V-shaped pressure-taking head, and the two pressure-taking holes are respectively connected to the positive pressure passage and the negative pressure passage;

[0026] The third flange is sleeved on the outer side of the tube body. A plurality of bolt holes are formed on the third flange, and adjusting bolts are inserted into the bolt holes.

[0027] In a possible implementation, the regulating valve includes:

[0028] A second connecting pipe is installed on the surface of the connecting piece, and the interior of the second connecting pipe is a hollow structure;

[0029] A switch knob is transmission-connected in the second connecting pipe, and one end of the switch knob is arranged in the connecting piece.

[0030] In a possible implementation, a positive pressure pipeline and a negative pressure pipeline are provided in the mounting member, and the positive pressure pipeline and the negative pressure pipeline pass through the connecting member and the connecting block in sequence and are provided at the differential pressure transmitter.

[0031] The utility model installs the first connecting pipe at the hole of the side wall of the installation pipe or the side wall of the steam pipeline, and then installs the pressure inlet pipe in the first connecting pipe through a flange connection. The advantage of using the flange connection is that the setting depth of the pressure inlet pipe in the steam pipeline can be adjusted, so that data acquisition and collection are more precise. Since it is used in a high-temperature and high-pressure pipeline, a cooling device is provided to cool the high-temperature gas to a certain extent, ensuring that the temperature entering the differential pressure transmitter will not damage the differential pressure transmitter, thereby extending the service life of the flow meter and effectively preventing the need to disassemble the flow meter to cause production suspension, while also avoiding the need to replace the flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0033] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0034] Figure 1 A three-dimensional diagram of a pitot flowmeter for high-temperature and high-pressure pipelines provided by the utility model;

[0035] Figure 2 A cross-sectional view of a cooling device provided by the utility model;

[0036] Figure 3 A three-dimensional diagram of the telescopic kit provided by the utility model;

[0037] Figure 4 A three-dimensional diagram of the pressure inlet pipeline provided by the utility model;

[0038] Figure 5A three-dimensional diagram of the regulating valve provided by the utility model;

[0039] In the figure: 1 differential pressure transmitter; 2 connecting piece; 3 mounting piece; 4 cooling device; 41 annular plate; 42 mounting block; 43 transmission rod; 44 lifting block; 45 moving block; 46 telescopic kit; 5 mounting pipe; 6 pressure inlet pipe; 61 baffle; 62 adjusting bolt; 63 pipe body; 64 V-shaped pressure tap; 65 pressure tapping hole; 66 third flange; 7 first connecting pipe; 8 regulating valve; 81 switch knob; 82 second connecting pipe. DETAILED DESCRIPTION

[0040] The following is a specific embodiment of the present invention. People familiar with the technology can easily understand the other advantages and functions of the present invention from the contents disclosed in this specification. Obviously, the described embodiment is a part of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Please refer to Figure 1-Figure 5 Now, a pitot flowmeter for high temperature and high pressure pipeline disclosed in the utility model is described. The utility model is composed of eight parts, such as Figure 1 , including a differential pressure transmitter 1, a connecting piece 2, a mounting piece 3, a cooling device 4, a mounting pipe 5, a pressure inlet pipe 6, a first connecting pipe 7 and a regulating valve 8, the mounting pipe 5 is installed in the steam pipeline, a through hole is opened on the side wall of the mounting pipe 5, first flanges are installed on the left and right sides of the mounting pipe 5, the bottom end of the first connecting pipe 7 is installed in the through hole, a second flange is arranged on the top of the first connecting pipe 7, the pressure inlet pipe 6 is inserted in the first connecting pipe 7, the bottom end of the pressure inlet pipe 6 is arranged inside the steam pipeline, the cooling device 4 is installed on the top of the pressure inlet pipe 6, the bottom end of the mounting piece 3 is inserted in the upper end of the cooling device 4, the top of the mounting piece 3 is connected to the connecting piece 2, the upper end of the connecting piece 2 is installed with a connecting block, a number of regulating valves 8 are installed in the connecting piece 2, the differential pressure transmitter 1 is inserted at the front end of the connecting block, a wire is inserted at the bottom end of the differential pressure transmitter 1, and the other end of the wire is connected to a flow calculator.

[0042] The utility model has two usage modes, one is pipe section type, the other is on-site pipeline opening type. The pipe section type is the same as Figure 1As shown in the figure, before the steam pipeline is used, a section of the steam pipeline is cut out at an appropriate position, and then the installation pipe 5 is connected by a flange and fixed at the position of the cut steam pipeline. In this case, the installation pipe 5 and the first connecting pipe 7 are already connected before the installation of the installation pipe 5, and then the flange connection is used to change the insertion depth of the pressure inlet pipe 6 and fix it. Another on-site pipeline opening method is to directly drill a hole in the steam pipeline, then install the first connecting pipe 7 into the hole, and then install the pressure inlet pipe 6 in place. After installation, start production, high-temperature and high-pressure gas will enter through the pressure inlet pipe 6, and then pass through the cooling device 4 for a certain cooling treatment. The pressure of this high-pressure gas is generally at the MPa level, and the cooling is generally heat exchange with the air, and the degree of cooling is generally not high, so the high pressure can still be maintained, so that the differential pressure can be measured without damaging the differential pressure transmitter 1. After the gas pressure reaches the differential pressure transmitter 1, it is collected by the differential pressure transmitter 1 and converted into a digital signal. The digital signal is transmitted to the flow calculator through a wire for flow measurement.

[0043] In a specific embodiment, Figure 2 The cooling device 4 includes a circular ring plate 41, a mounting block 42, a transmission rod 43, a lifting block 44 and a moving block 45. The lower end of the mounting block 42 is mounted on the upper part of the pressure inlet pipe 6, and a plurality of lifting blocks 44 are arranged on the upper end of the mounting block 42. A slide groove is opened inside the lifting block 44. The moving block 45 is arranged on the upper end of the lifting block 44. A slide groove is opened inside the moving block 45. The transmission rod 43 is fixed on the upper ends of the mounting block 42 and the lifting block 44. The transmission rod 43 is connected in the slide groove. A plurality of circular ring plates 41 are installed on the inner surfaces of the moving block 45 and the lifting block 44. Since the temperature of the gas generated at each time during the production process is not necessarily the same, when setting the cooling device 4, the heat exchange area must be changed according to the pressure generated by each temperature. When the gas temperature is not high, the pressure generated is not enough to push the annular plate 41 upward, so that the heat exchange area is at the minimum. When the temperature is too high, the gas pressure will push the annular plate 41 upward and drive the lifting block 44 upward, revealing the transmission rod 43 hidden in the lifting block 44, thereby increasing the heat exchange area between the gas and the outside world and improving the heat exchange efficiency. The lifting block 44 is multi-stage, so that the greater the gas pressure, the larger the heat exchange area. In addition, the multi-stage setting allows each level of the lifting block 44 to descend in turn when the gas pressure decreases, thereby avoiding damage.

[0044] In a specific embodiment, Figure 3 , a telescopic set 46 is arranged inside the plurality of circular plates 41. Because the flow meter is to take pressure with two holes, two pressures are generated, and the telescopic set 46 not only effectively separates the two pressures through the sleeve plate design, but also can cooperate with the lifting block 44 to rise and fall.

[0045] In a specific embodiment, Figure 4 The pressure inlet pipe 6 includes a baffle 61, an adjusting bolt 62, a pipe body 63, a V-shaped pressure head 64, a pressure hole 65 and a third flange 66. The pipe body 63 is provided with a baffle 61 inside, a positive pressure passage and a negative pressure passage are formed between the baffle 61 and the pipe body 63, a rectifying groove is provided on the outer surface of the pipe body 63, the V-shaped pressure head 64 is installed at the bottom end of the pipe body 63, and pressure holes 65 are respectively opened on the two surfaces of the V-shaped pressure head 64. The two pressure holes 65 are respectively connected to the positive pressure passage and the negative pressure passage. The third flange 66 is sleeved on the outer side of the pipe body 63, and a plurality of bolt holes are opened on the third flange 66, and the adjusting bolts 62 are inserted into the bolt holes. The two pressures enter from the pressure holes 65 respectively, and then enter the two passages. The pressure taking position of the V-shaped pressure head 64 can be adjusted by setting the third flange 66 and the second flange.

[0046] In a specific embodiment, Figure 5 The regulating valve 8 includes a switch knob 81 and a second connecting pipe 82. The second connecting pipe 82 is mounted on the surface of the connecting member 2. The second connecting pipe 82 is a hollow structure. The switch knob 81 is transmission-connected in the second connecting pipe 82. One end of the switch knob 81 is disposed in the connecting member 2. By disposing the switch knob 81, the pressure channel can be blocked to prevent the gas from flowing to the differential pressure transmitter 1, so that the replacement of the differential pressure transmitter 1 is facilitated.

[0047] In a specific embodiment, a positive pressure pipeline and a negative pressure pipeline are arranged in the mounting member 3, and the positive pressure pipeline and the negative pressure pipeline pass through the connector 2 and the connecting block in sequence and are arranged at the differential pressure transmitter 1. The arrangement of the two pipelines can not only better display the real-time pressure, but also make it easier for the flow calculator to analyze and calculate the data.

[0048] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A pitot flowmeter for high temperature and high pressure pipelines, characterized in that: include: A mounting pipe (5) is mounted in the steam pipeline, a through hole is opened on the side wall of the mounting pipe (5), and first flanges are mounted on the left and right sides of the mounting pipe (5); A first connecting pipe (7), the bottom end of which is installed in the through hole, and a second flange is provided on the top end of the first connecting pipe (7); A pressure inlet pipe (6) is inserted into the first connecting pipe (7), and the bottom end of the pressure inlet pipe (6) is arranged inside the steam pipeline; A cooling device (4) is installed at the top of the pressure inlet pipe (6); A mounting member (3), the bottom end of which is inserted into the upper end of the cooling device (4); the top end of the mounting member (3) is connected to a connecting member (2); and the upper end of the connecting member (2) is provided with a connecting block; A plurality of regulating valves (8) installed in the connecting member (2); A differential pressure transmitter (1) is inserted at the front end of the connection block; A wire is inserted into the bottom end of the differential pressure transmitter (1), and the other end of the wire is connected to a flow calculator.

2. The pitot flowmeter for high temperature and high pressure pipeline according to claim 1, characterized in that: The temperature reduction device (4) comprises: A mounting block (42), the lower end of which is mounted on the upper portion of the pressure inlet pipe (6); A plurality of lifting blocks (44) are arranged on the upper end of the mounting block (42), and a sliding groove is formed inside the lifting blocks (44); A moving block (45) is arranged on the upper end of the lifting block (44), and the sliding groove is formed inside the moving block (45); A transmission rod (43) is fixed to the upper ends of the mounting block (42) and the lifting block (44), and the transmission rod (43) is transmission-connected in the slide groove; A plurality of annular plates (41) are mounted on the inner surfaces of the moving block (45) and the lifting block (44).

3. The pitot flowmeter for high temperature and high pressure pipeline according to claim 2, characterized in that: A telescopic sleeve (46) is arranged inside the plurality of circular plates (41).

4. The pitot flowmeter for high temperature and high pressure pipeline according to claim 1, characterized in that: The pressure inlet pipeline (6) comprises: The tube body (63) is provided with a baffle (61) inside, a positive pressure passage and a negative pressure passage are formed between the baffle (61) and the tube body (63), and a rectifying groove is provided on the outer surface of the tube body (63); A V-shaped pressure-taking head (64) is installed at the bottom end of the tube body (63), and pressure-taking holes (65) are respectively opened on two surfaces of the V-shaped pressure-taking head (64), and the two pressure-taking holes (65) are respectively connected to the positive pressure passage and the negative pressure passage; The third flange (66) is sleeved on the outer side of the tube body (63). The third flange (66) is provided with a plurality of bolt holes, and the adjusting bolts (62) are inserted into the bolt holes.

5. The pitot flowmeter for high temperature and high pressure pipeline according to claim 1, characterized in that: The regulating valve (8) comprises: A second connecting pipe (82) is installed on the surface of the connecting piece (2), and the interior of the second connecting pipe (82) is a hollow structure; A switch knob (81) is transmission-connected in the second connecting tube (82), and one end of the switch knob (81) is arranged in the connecting member (2).

6. The pitot flowmeter for high temperature and high pressure pipeline according to claim 1, characterized in that: A positive pressure pipeline and a negative pressure pipeline are arranged in the mounting member (3), and the positive pressure pipeline and the negative pressure pipeline pass through the connecting member (2) and the connecting block in sequence and are arranged at the differential pressure transmitter (1).

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