CN211927949U - Gas velocity measuring device for dust-containing gas pipeline - Google Patents
Gas velocity measuring device for dust-containing gas pipeline Download PDFInfo
- Publication number
- CN211927949U CN211927949U CN202020842334.4U CN202020842334U CN211927949U CN 211927949 U CN211927949 U CN 211927949U CN 202020842334 U CN202020842334 U CN 202020842334U CN 211927949 U CN211927949 U CN 211927949U
- Authority
- CN
- China
- Prior art keywords
- gas pipeline
- ball valve
- pipeline
- pressure
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model belongs to the technical field of the measuring equipment technique and specifically relates to a gas velocity measurement device for dirty gas pipeline is related to. The device comprises a cylindrical velocimeter, a first pressure measuring device and a second pressure measuring device, wherein the cylindrical velocimeter is perpendicular to a gas pipeline; the side wall of the velocimeter is provided with a through middle hole and a lateral hole; the middle hole and the lateral holes are positioned at the same height, and the axes of the two holes point to the axis of the velocimeter; the middle hole is opposite to the flowing direction of the airflow to be measured, and the first pressure measuring device is connected with the middle hole through a first gas pipeline; the second pressure measuring device is connected with the lateral hole through a second gas pipeline; the first gas pipeline and the second gas pipeline are connected in parallel; the device can be used for online measurement, has no response time, and does not need manual measurement by devices such as a pitot tube. Even if the impedance coefficient is changed due to the ash entering of the two throttling devices, the measurement result is not influenced because no gas flows through the judgment of the differential pressure, and the measurement accuracy is higher.
Description
Technical Field
The utility model belongs to the technical field of the measuring equipment technique and specifically relates to a gas velocity measurement device for dirty gas pipeline is related to.
Background
With the development of the industry in China, the flow velocity measurement of high-temperature dust-containing gas plays an important role in optimizing process operation, reducing energy consumption and reducing pollutant emission.
The measurement of the primary air quantity and the secondary air quantity of a blast furnace converter coke oven in the metallurgical industry, the thermal power generation industry and the tertiary air quantity in the cement industry all need to be carried out with accurate flow velocity measurement. The gas to be measured generally has the characteristics of high temperature (up to over 1000 ℃), high dust content and the like. Traditional measurement methods such as venturi tube, thermal flowmeter, hot wire anemometer, bar flowmeter, cylindrical velocimeter, pitot tube all are all seriously inadaptable to the operational environment of high dust, block up very easily.
SUMMERY OF THE UTILITY MODEL
The utility model provides a gas velocity measuring device for dust-containing gas pipeline for solving the technical problem existing in the prior art.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a gas velocity measuring device for a dusty gas pipeline comprises a cylindrical velocimeter, a first pressure measuring device and a second pressure measuring device, wherein the cylindrical velocimeter is perpendicular to the gas pipeline; the side wall of the velocimeter is provided with a through middle hole and a lateral hole; the middle hole and the lateral holes are positioned at the same height, and the axes of the two holes point to the axis of the velocimeter and intersect at a point O; the middle hole is over against the flowing direction of the airflow to be measured, and the included angle between the lateral hole and the airflow direction is equal to the included angle alpha between the lateral hole and the middle hole in the axial direction;
the first pressure measuring device is connected with the middle hole through a first gas pipeline; the second pressure measuring device is connected with the lateral hole through a second gas pipeline; the first gas pipeline and the second gas pipeline are connected in parallel;
the first pressure measuring device comprises a first compressed air tank and a first throttling device, wherein the first compressed air tank and the first throttling device are arranged on the first gas pipeline; a first ball valve is arranged at the inlet end of the first throttling device; a ball valve II is arranged at the inlet end of the compressed air tank I; a first pressure testing pipeline communicated with the first gas pipeline is arranged between the first throttling device and the first ball valve, and a third ball valve and the first pressure testing device are arranged on the first pressure testing pipeline; a pressure testing pipeline II communicated with the gas pipeline I is arranged at the inlet end of the ball valve II; a ball valve IV and a pressure testing device II are arranged on the pressure testing pipeline II; the first pressure measuring device further comprises a third gas pipeline, and the third gas pipeline is arranged between the inlet end of the first throttling device and the first compressed air tank; a ball valve V is arranged on the gas pipeline III;
the second pressure measuring device comprises a second compressed air tank and a second throttling device, wherein the second compressed air tank and the second throttling device are arranged on the second gas pipeline; a ball valve six is arranged at the inlet end of the throttling device II; a ball valve seventh is arranged at the inlet end of the compressed air tank II; a third pressure testing pipeline communicated with the second gas pipeline is arranged between the second throttling device and the sixth ball valve, and a eighth ball valve and a third pressure testing device are arranged on the third pressure testing pipeline; a pressure test pipeline IV communicated with the gas pipeline II is arranged at the inlet end of the ball valve VII; a ball valve nine and a pressure testing device IV are arranged on the pressure testing pipeline IV;
the second pressure measuring device further comprises a fourth gas pipeline, and the fourth gas pipeline is arranged between the inlet end of the second throttling device and the second compressed air tank; and a ball valve ten is arranged on the gas pipeline four.
Furthermore, the included angle alpha between the lateral holes and the middle hole is 0-90 degrees.
Furthermore, the first pressure testing device and the second pressure testing device are one of a pressure gauge or a pressure transmitter.
Further, all the ball valves are one of manual valves, electric valves and pneumatic valves.
Furthermore, the first throttling device and the second throttling device are one of a venturi tube and a standard orifice plate.
The utility model has the advantages and positive effects that:
first, because increased compressed air and swept, can thoroughly solve cylindrical tachymeter and block up the inaccurate problem of measurement that leads to in the high dust environment.
Secondly, the device can be used for online measurement, has no response time, and does not need manual measurement by devices such as a pitot tube.
Thirdly, even if the impedance coefficient is changed due to the ash entering of the two throttling devices, the device does not influence the measurement result and improves the measurement accuracy because no gas flows through the differential pressure judgment.
Description of the drawings:
FIG. 1 is a schematic view of the gas velocity measuring apparatus of the present invention;
fig. 2 is a schematic diagram of the velocity measuring instrument of the present invention;
fig. 3 is a top view of fig. 2.
Wherein: 1. a velocimeter; 11. a middle hole; 12. a lateral aperture;
2. a first pressure measuring device; 21. a gas pipeline I; 22. a first compressed air tank; 23. a first throttling device; 24. a first ball valve; 25. A ball valve II; 26. a ball valve III; 27. a first pressure testing device; 28. a ball valve IV; 29. a second pressure testing device; 210. a gas pipeline III; 211. a ball valve V;
3. a second pressure measuring device; 31. a second gas pipeline; 32. a second compressed air tank; 33. a second throttling device; 34. a ball valve six; 35. A ball valve seventh; 36. a ball valve eight; 37. a third pressure testing device; 38. a ball valve nine; 39. a fourth pressure testing device; 310. a fourth gas pipeline; 311. and a ball valve ten.
Detailed Description
The drawings in the embodiments of the present invention will be combined; the technical scheme in the embodiment of the utility model is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the present invention; rather than all embodiments. Based on the embodiment of the utility model; all other embodiments obtained by a person skilled in the art without making any inventive step; all belong to the protection scope of the utility model.
As shown in fig. 1-3, the utility model provides a gas velocity measuring device for a dusty gas pipeline, which comprises a cylindrical velocimeter 1, a first pressure measuring device 2 and a second pressure measuring device 3, which are arranged perpendicular to the gas pipeline; the side wall of the velocimeter 1 is provided with a through middle hole 11 and a lateral hole 12; the middle hole 11 and the lateral hole 12 are positioned at the same height, and the axes of the two holes point to the axis of the velocimeter 1 and intersect at a point O; preferably, the middle hole 11 faces the flowing direction of the airflow to be measured, so that the included angle between the lateral hole 12 and the airflow direction is equal to the included angle alpha between the lateral hole 12 and the middle hole 11 in the axial direction; preferably, the included angle between the two holes is alpha between 0 and 90 degrees; the first pressure measuring device 2 is connected with the middle hole 11 through a first gas pipeline 21; the second pressure measuring device 3 is connected with the lateral hole 12 through a second gas pipeline 31; the first gas pipeline 21 and the second gas pipeline 31 are connected in parallel;
the pressure measuring device I2 comprises a compressed air tank I22 and a throttling device I23 which are arranged on a gas pipeline I21, and the throttling device I23 is arranged between the middle hole 11 and the compressed air tank I22; a first ball valve 24 is arranged at the inlet end of the first throttling device 23; a second ball valve 25 is arranged at the inlet end of the first compressed air tank 22; a first pressure testing pipeline communicated with the first gas pipeline 21 is arranged between the first throttling device 23 and the first ball valve 24, and a third ball valve 26 and a first pressure testing device 27 are arranged on the first pressure testing pipeline; a pressure test pipeline II communicated with the gas pipeline I21 is arranged at the inlet end of the ball valve II 25; a fourth ball valve 28 and a second pressure testing device 29 are arranged on the second pressure testing pipeline; the pressure measuring device I2 further comprises a gas pipeline III 210, and the gas pipeline III 210 is arranged between the inlet end of the throttling device I23 and the compressed air tank I22; and a ball valve five 211 is arranged on the gas pipeline three 210.
The second pressure measuring device 3 comprises a second compressed air tank 32 and a second throttling device 33 which are arranged on the second gas pipeline 31, and the second throttling device 33 is arranged between the lateral hole 12 and the second compressed air tank 32; a ball valve six 34 is arranged at the inlet end of the second throttling device 33; a ball valve seventh 35 is arranged at the inlet end of the second compressed air tank 32; a third pressure testing pipeline communicated with the second gas pipeline 31 is arranged between the second throttling device 33 and the sixth ball valve 34, and an eighth ball valve 36 and a third pressure testing device 37 are arranged on the third pressure testing pipeline; a pressure test pipeline IV communicated with the gas pipeline II 31 is arranged at the inlet end of the ball valve seventh 35; a ball valve nine 38 and a pressure testing device four 39 are arranged on the pressure testing pipeline four; all pressure measurement devices in this patent can be pressure gauges or pressure transmitters.
The second pressure measuring device 3 further comprises a fourth gas pipeline 310, and the fourth gas pipeline 310 is arranged between the inlet end of the second throttling device 33 and the second compressed air tank 32; and a ball valve ten 311 is arranged on the gas pipeline four 310. All ball valves in this patent can be manual valves and also can be electric, pneumatic valve.
Preferably, the first compressed air tank 22 and the second compressed air tank 32 can be two separate compressed air tanks, or can be combined into one compressed air tank; the inlet of the compressed air tank is connected with a compressed air source. Preferably, all of the restriction means may be one of venturi, standard orifice and the like.
The utility model discloses the application method of device, including following step:
firstly, assembling the device on site according to requirements;
secondly, vertically inserting the cylindrical velocimeter 1 into a gas pipeline to be measured, so that the middle hole 11 faces the flow direction of the gas to be measured, and the angle between the lateral hole 12 and the gas flow direction is equal to the included angle between the lateral hole 12 and the middle hole 11;
step three, closing the ball valve five 211 and the ball valve ten 311, and opening all the other ball valves 2;
step four, adjusting the opening of the second ball valve 25 to enable the indication value of the first pressure testing device to be equal to the indication value of the second pressure measuring device, wherein no gas flows in the first pressure measuring device 2, the indication value of the second pressure measuring device is the pressure of the middle hole 11, and the displayed pressure value is read;
step five, adjusting the opening of the ball valve seven 35 to enable the indication value of the pressure measuring device three to be equal to the indication value of the pressure measuring device four, wherein no gas flows in the pressure measuring device two 3 at the moment, the indication value of the pressure measuring device four is the pressure of the lateral hole 12, and reading the displayed pressure value;
step six, calculating:
firstly, obtaining the temperature and the density rho of gas to be measured through other measurements, and taking alpha as 30 degrees;
secondly, according to the formula of the flow velocity distribution on the surface of the column: vVelocity of gas to be measured＝-2*VLateral hole*sinα；
And then according to an energy equation between the middle hole 11 and the lateral hole 12: pMiddle hole/(ρ*g)＝PLateral hole/(ρ*g)+VLateral hole/2g；
After finishing, the method comprises the following steps:
the speed of the gas to be measured can be obtained;
substituting alpha to 30 deg. to obtain
When (P)Middle hole-PLateral hole) When rho is 0.294, V is-0.767 m/s;
the negative sign indicates the direction of the gas to be measured, and is opposite to the direction in which the point O points to the middle hole 11;
seventhly, clearing the blockage: all the ball valves can be opened periodically and at any time, and the whole pipeline is cleaned by compressed air in the compressed air tank.
After the measuring device is used on a dust-containing gas pipeline, the response time is obviously shortened, and the accuracy is improved; when the whole apparatus was taken out from the dusty gas pipe, it was observed that the inner pipe surface was very smooth and no dust adhered.
The embodiments of the present invention have been described in detail, but the above description is only for the preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.
Claims (5)
1. A gas velocity measuring device for a dirty gas duct, characterized by: the device comprises a cylindrical velocimeter, a first pressure measuring device and a second pressure measuring device, wherein the cylindrical velocimeter is perpendicular to a gas pipeline; the side wall of the velocimeter is provided with a through middle hole and a lateral hole; the middle hole and the lateral holes are positioned at the same height, and the axes of the two holes point to the axis of the velocimeter; the middle hole is over against the flowing direction of the airflow to be measured, and the included angle between the lateral hole and the airflow direction is equal to the included angle alpha between the lateral hole and the middle hole in the axial direction;
the first pressure measuring device is connected with the middle hole through a first gas pipeline; the second pressure measuring device is connected with the lateral hole through a second gas pipeline; the first gas pipeline and the second gas pipeline are connected in parallel;
the first pressure measuring device comprises a first compressed air tank and a first throttling device, wherein the first compressed air tank and the first throttling device are arranged on the first gas pipeline; a first ball valve is arranged at the inlet end of the first throttling device; a ball valve II is arranged at the inlet end of the compressed air tank I; a first pressure testing pipeline communicated with the first gas pipeline is arranged between the first throttling device and the first ball valve, and a third ball valve and the first pressure testing device are arranged on the first pressure testing pipeline; a pressure testing pipeline II communicated with the gas pipeline I is arranged at the inlet end of the ball valve II; a ball valve IV and a pressure testing device II are arranged on the pressure testing pipeline II; the first pressure measuring device further comprises a third gas pipeline, and the third gas pipeline is arranged between the inlet end of the first throttling device and the first compressed air tank; a ball valve V is arranged on the gas pipeline III;
the second pressure measuring device comprises a second compressed air tank and a second throttling device, wherein the second compressed air tank and the second throttling device are arranged on the second gas pipeline; a ball valve six is arranged at the inlet end of the throttling device II; a ball valve seventh is arranged at the inlet end of the compressed air tank II; a third pressure testing pipeline communicated with the second gas pipeline is arranged between the second throttling device and the sixth ball valve, and a eighth ball valve and a third pressure testing device are arranged on the third pressure testing pipeline; a pressure test pipeline IV communicated with the gas pipeline II is arranged at the inlet end of the ball valve VII; a ball valve nine and a pressure testing device IV are arranged on the pressure testing pipeline IV;
the second pressure measuring device further comprises a fourth gas pipeline, and the fourth gas pipeline is arranged between the inlet end of the second throttling device and the second compressed air tank; and a ball valve ten is arranged on the gas pipeline four.
2. The gas velocity measuring apparatus according to claim 1, wherein: the included angle between the lateral hole and the middle hole is alpha between 0 and 90 degrees.
3. The gas velocity measuring apparatus according to claim 1, wherein: the first pressure testing device and the second pressure testing device are one of a pressure gauge or a pressure transmitter.
4. The gas velocity measuring apparatus according to claim 1, wherein: all ball valves are one of manual valves, electric valves and pneumatic valves.
5. The gas velocity measuring apparatus according to claim 1, wherein: the first throttling device and the second throttling device are one of a venturi tube and a standard orifice plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020842334.4U CN211927949U (en) | 2020-05-19 | 2020-05-19 | Gas velocity measuring device for dust-containing gas pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020842334.4U CN211927949U (en) | 2020-05-19 | 2020-05-19 | Gas velocity measuring device for dust-containing gas pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211927949U true CN211927949U (en) | 2020-11-13 |
Family
ID=73320725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020842334.4U Active CN211927949U (en) | 2020-05-19 | 2020-05-19 | Gas velocity measuring device for dust-containing gas pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211927949U (en) |
-
2020
- 2020-05-19 CN CN202020842334.4U patent/CN211927949U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107270982B (en) | A kind of gas flow measurement experimental provision that measuring device is mobile | |
| CN111853851B (en) | Primary air speed correction and leveling method for coal-fired thermal power generating unit boiler | |
| CN105865587A (en) | Calibration method of engine flowmeter | |
| CN206695848U (en) | Continuous purging block-resistant type apparatus for measuring air quantity | |
| CN106442857A (en) | Detection method and detection device for carbon dioxide emission based on oxygen content determination | |
| CN109211372A (en) | Low pressure critical flow venturi nozzle calibrating installation | |
| CN201955111U (en) | Pitot tube flow meter | |
| CN108490219B (en) | Device and method for correcting flow velocity calculation of matrix speed measuring equipment | |
| CN211927949U (en) | Gas velocity measuring device for dust-containing gas pipeline | |
| CN207991654U (en) | A kind of portable gas table calibrating installation | |
| CN108444555A (en) | A kind of novel Venturi tube-type spreader flowmeter | |
| CN209639805U (en) | A kind of aerospace automatic calibration unit for gas flowmeters | |
| CN208043727U (en) | A kind of online dew-point detecting device of iron and steel enterprise's air compression system | |
| CN211121383U (en) | Air flow measuring device that array was arranged | |
| CN206291942U (en) | A kind of blowing type liquid level meter | |
| CN206788201U (en) | A kind of Pitot tube component and the Flow speed measurer using the Pitot tube component | |
| CN208984180U (en) | Low pressure critical flow venturi nozzle calibrating installation | |
| CN112547294B (en) | Method for acquiring inlet air volume of medium-speed coal mill under thermal state | |
| CN203350154U (en) | Density detector | |
| CN207248254U (en) | A kind of apparatus for measuring air quantity | |
| Baker et al. | The measurement of gas flow part i | |
| CN206291940U (en) | A kind of blowing type liquid level meter | |
| CN208026664U (en) | A kind of finned tube testing device for heat transferring performance based on Real-Time Atmospheric humidity and pressure | |
| CN206788085U (en) | A kind of online dew-point detecting device | |
| CN207123306U (en) | A kind of moisture orifice flowmeter for flux of moisture metering |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |