Detection device for measuring large-diameter flue gas flow
By designing a detection device for large-diameter flue, the combination of full pressure and static pressure mean chamber and measurement hole is used to achieve continuous and accurate monitoring of gas flow, solving the problem that existing single-hole pitot tube flowmeter cannot achieve continuous monitoring and inaccurate data.
Patent Information
- Application Number
- CN202421647068.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-07-12
AI Technical Summary
The single-hole pitot tube flowmeter used in existing online testing equipment can only measure a single point flow velocity and cannot achieve continuous monitoring. In the case where large-diameter flue and multiple equipment share one flue, the flow velocity distribution is chaotic, and the single point flow velocity cannot represent the overall flow velocity, resulting in inaccurate data.
A detection device for measuring the gas flow rate of a large diameter flue is designed, including a detection rod and a connecting flowmeter. The inner part of the detection rod is cut into a full-pressure mean chamber and a static pressure mean chamber. The pressure value is obtained through the full-pressure and static pressure measurement holes, and the stable average is performed in combination with the equal-ring area method to achieve continuous monitoring of the gas flow rate.
The detection device can achieve accurate and continuous monitoring of gas flow in large diameter flue, avoiding the inaccuracy of single-point pitot tube flowmeters, and has the advantages of simple structure, low price, good stability, less power consumption, easy installation, small maintenance, small pressure loss and high accuracy.
Smart Images
Figure CN222748061U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of flue gas emission, in particular to a detection device for measuring the gas flow of a large-caliber flue. Background Art
[0002] The flue gas emission continuous monitoring system is a monitoring system used to measure the concentration of various pollutants in industrial flue gas in real time and continuously. Through continuous sampling and analysis, the gas concentration, particulate matter concentration, flue gas temperature, flow rate, pressure, humidity, oxygen content, etc. in the flue gas are measured, and the concentration and total emission of pollutants are obtained by calculation. The detected concentration and emission will be uploaded to the Environmental Protection Bureau in real time, so the accuracy of the test data is particularly important.
[0003] The flow rate measuring device currently used in online detection equipment of various brands is a single-hole pitot tube velocity measuring device, which can only measure the flow rate at a single point and cannot achieve continuous monitoring. The flow rate distribution in the pipeline has a greater impact on it. At the same time, the pitot tube has high operation requirements and consumes a lot of man-hours. It is suitable for standard tests, but in large-diameter flues and when multiple devices share a flue, the flow field is more turbulent due to changes in the operating state. The flow rate obtained at a single point cannot represent the overall flow rate, and the data is not accurate enough. Utility Model Content
[0004] 1. Technical issues to be resolved
[0005] In view of the deficiencies of the prior art, the utility model provides a detection device for measuring the flow rate of large-caliber flue gas.
[0006] (II) Technical solution
[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a detection device for measuring the flow rate of large-diameter flue gas, comprising a detection rod and a connecting flow meter, the detection rod comprising a total pressure lead-in pipe, a static pressure lead-in pipe, a total pressure averaging cavity, a total pressure measuring hole, a static pressure averaging cavity and a static pressure measuring hole, the detection rod is a hollow tube, the interior of which is divided into a total pressure averaging cavity and a static pressure averaging cavity which are not connected to each other, the total pressure lead-in pipe is connected to the total pressure averaging cavity, the static pressure lead-in pipe is connected to the static pressure averaging cavity, the total pressure averaging cavity is provided with a plurality of groups of total pressure measuring holes at one end away from the static pressure averaging cavity, the static pressure averaging cavity is provided with the static pressure measuring hole at one end away from the total pressure averaging cavity, and the connecting flow meter is provided below the detection rod.
[0008] Preferably, the static pressure measuring holes are arranged as a group.
[0009] Preferably, a joint is provided above the connecting flow meter, and connecting ports adapted to the joint are provided below the connecting flow meter and below the detection rod.
[0010] Preferably, the detection rod is made of metal.
[0011] In order to facilitate the disassembly and assembly of the connecting flow meter and the detection rod, the connecting flow meter and the detection rod are detachably connected.
[0012] Preferably, the connection port is a threaded port, the joint is a threaded rod, and the threaded rod is threadedly connected to the threaded port.
[0013] (III) Beneficial effects
[0014] Compared with the prior art, the utility model provides a detection device for measuring the flow rate of large-caliber flue gas, which has the following beneficial effects:
[0015] The detection device for measuring the gas flow of large-diameter flue gas shares a flue production site, avoiding the situation that the single-point Pitot tube flowmeter used in the current online flue gas detection equipment detects inaccurate flow rate. At the same time, the detection equipment has a simple structure, low price, good stability, low power consumption, easy installation, low maintenance, small pressure loss, good accuracy, and is conducive to promotion. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the structure detection rod of the utility model;
[0017] Figure 2 This is a schematic diagram of the structure connection flow meter of the utility model;
[0018] Figure 3 It is a partial cross-sectional schematic diagram of the structure of the utility model;
[0019] Figure 4 This is a schematic diagram of the arrangement of the detection rod structure in the pipeline of the utility model;
[0020] Figure 5 It is a schematic diagram of the structural assembly of the utility model.
[0021] In the figure: 1. Full-pressure pressure pipe; 2. Static pressure pressure pipe; 3. Full-pressure averaging chamber; 4. Full-pressure measuring hole; 5. Static pressure averaging chamber; 6. Static pressure measuring hole; 7. Detection rod; 8. Connector. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] See also Figure 1-5 A detection device for measuring the flow rate of large-diameter flue gas comprises a detection rod 7 and a connecting flow meter 8, wherein the detection rod 7 comprises a total-pressure pressure-guiding pipe 1, a static-pressure pressure-guiding pipe 2, a total-pressure averaging cavity 3, a total-pressure measuring hole 4, a static-pressure averaging cavity 5 and a static-pressure measuring hole 6, wherein the detection rod 7 is a hollow tube, the interior of which is divided into a total-pressure averaging cavity 3 and a static-pressure averaging cavity 5 which are not connected to each other, the total-pressure pressure-guiding pipe 1 is connected to the total-pressure averaging cavity 3, the static-pressure pressure-guiding pipe 2 is connected to the static-pressure averaging cavity 5, a plurality of groups of total-pressure measuring holes 4 are arranged at one end of the total-pressure averaging cavity 3 away from the static-pressure averaging cavity 5, the static-pressure averaging cavity 5 is arranged at one end away from the total-pressure averaging cavity 3, and the connecting flow meter 8 is arranged below the detection rod 7.
[0024] In actual use, the total pressure lead pipe 1 is connected to the total pressure averaging chamber 3, and the measured pressure average is uploaded to the positive pressure of the differential pressure transmitter. The side static pressure lead pipe 2 is connected to the static pressure averaging chamber 5 to transmit the measured pressure to the negative pressure side of the differential pressure transmitter. The side of the detection rod 7 facing the flue gas flow direction is the total pressure averaging chamber 3, which is connected to all the total pressure measuring holes 4, and the pressure values obtained by the total pressure measuring holes 4 are stabilized and averaged. The total pressure hole mainly measures the pressure value related to the flow velocity of the flue gas flow as the total pressure. This detection rod 7 and the connecting flow meter 8 select a total of 8 total pressure holes according to the equal annular area method, and they are drilled symmetrically along the central axis of the measured pipeline on the windward side of the metal detection rod 7. The other side of the detection rod 7 is the static pressure averaging chamber 5, and the pressure values obtained by the static pressure measuring holes 6 are stabilized and averaged.
[0025] In this embodiment, the static pressure measuring holes 6 are arranged as a group. During the measurement process of the flow meter, the pressure on the back flow side is basically the same and there is no lateral flow, so only one static pressure hole is used.
[0026] According to needs, a connector 9 is provided above the connecting flow meter 8, and threaded openings matching the connector 9 are provided below the connecting flow meter 8 and below the detection rod 7. The corresponding connecting flow meter 8 can be connected to the corresponding connecting flow meter 8 or detection rod 7.
[0027] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.
[0028] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.
[0029] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.
[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A detection device for measuring the flow rate of large-caliber flue gas, comprising a detection rod (7) and a connecting flow meter (8), characterized in that: The detection rod (7) comprises a total pressure guiding pipe (1), a static pressure guiding pipe (2), a total pressure averaging cavity (3), a total pressure measuring hole (4), a static pressure averaging cavity (5) and a static pressure measuring hole (6). The detection rod (7) is a hollow tube, the interior of which is divided into a total pressure averaging cavity (3) and a static pressure averaging cavity (5) which are not connected to each other. The total pressure guiding pipe (1) is connected to the total pressure averaging cavity (3), the static pressure guiding pipe (2) is connected to the static pressure averaging cavity (5), a plurality of groups of total pressure measuring holes (4) are arranged at one end of the total pressure averaging cavity (3) away from the static pressure averaging cavity (5), the static pressure averaging cavity (5) is arranged at one end of the static pressure averaging cavity (5) away from the total pressure averaging cavity (3), and the connecting flow meter (8) is arranged below the detection rod (7).
2. A detection device for measuring large-caliber flue gas flow according to claim 1, characterized in that: The static pressure measuring holes (6) are arranged as a group.
3. A detection device for measuring large-caliber flue gas flow according to claim 2, characterized in that: A joint (9) is arranged above the connecting flow meter (8), and a connecting port adapted to the joint (9) is arranged below the connecting flow meter (8) and below the detection rod (7).
4. A detection device for measuring large-caliber flue gas flow according to claim 3, characterized in that: The detection rod (7) is made of metal.
5. A detection device for measuring large-caliber flue gas flow according to claim 4, characterized in that: The connecting flow meter (8) and the detecting rod (7) are detachably connected.
6. A detection device for measuring large-caliber flue gas flow according to claim 5, characterized in that: The connection port is a threaded port, and the joint (9) is a threaded rod, which is threadedly connected to the threaded port.