CN212228978U - Flow velocity measuring system - Google Patents
Flow velocity measuring system Download PDFInfo
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- CN212228978U CN212228978U CN202021199276.4U CN202021199276U CN212228978U CN 212228978 U CN212228978 U CN 212228978U CN 202021199276 U CN202021199276 U CN 202021199276U CN 212228978 U CN212228978 U CN 212228978U
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Abstract
The utility model discloses a flow velocity measuring system, which comprises three differential pressure transmitters and a pitot tube; the pitot tube comprises a positive pressure pipe, a negative pressure pipe, a mounting flange, two branch pipes and two positive pressure inlet pipes; a main pipe ash removal mechanism for removing ash in the pipe is arranged in each of the positive pressure leading pipe and the negative pressure leading pipe; the upper end and the lower end of each positive pressure inlet pipe are provided with a branch pipe ash removal mechanism for removing ash in the pipe. The flow velocity measurement system can perform rapping dust removal at the lower end pipe orifices of the positive pressure pipe and the negative pressure pipe by using the main pipe dust removal mechanism, so that the influence of soot extrusion on measurement is prevented; the pipe orifices at the upper end and the lower end of the positive pressure inlet pipe can be cleaned by vibration by using the pipe dividing and dust cleaning mechanism, so that the influence of the extrusion of the ash on the measurement is prevented; the upper end and the lower end of the two positive pressure inlet pipes and the lower end of the positive pressure leading pipe are both arranged to be oblique notches, so that five positive pressure collection points can be realized, and the reliability of positive pressure collection is ensured.
Description
Technical Field
The utility model relates to a boiler detecting system, especially a be used for boiler wind powder pipe velocity of flow measurement's velocity of flow measurement system.
Background
The primary air flow velocity is taken as an important parameter for combustion adjustment of the power station boiler, and plays an important role in safe and economic operation of the boiler; accurate flow rate measurement is beneficial to selecting the optimal combustion condition and really achieving energy conservation and emission reduction, and the safety and the economic benefit of the system are improved. For years, the combustion of the boiler is generally adjusted by traditional monitoring means such as visual observation, air duct static pressure display, air door baffle opening adjustment and the like, the methods are simple and visual, but the flow velocity of primary air of the boiler cannot be directly and accurately monitored, the combustion adjustment is still in a state of being dependent on feeling and experience, and the combustion working condition in a hearth cannot be really and effectively monitored and adjusted; therefore, the uneven air distribution of the boiler can be caused, the combustion efficiency is reduced, even the flame center is deflected, and the combustion is unstable, so that the flameout and blasting are caused, the local coking is caused, the residual torsion of the flue gas at the outlet of the hearth and the explosion and leakage of the furnace tube are aggravated, the heat efficiency of the boiler is reduced, and the potential safety hazard in production is caused; therefore, it is important to monitor the boiler flow rate reliably in real time.
Although a power plant tester can seriously test the boiler to level the air distribution before the newly built boiler is put into operation or after the boiler is overhauled every time, after the boiler runs for a period of time, the working condition set by initial debugging can be changed more or less, so that a means for monitoring the boiler in real time and adjusting the boiler at any time is required to be provided for maintaining a good running state of the boiler. Therefore, it is necessary to design a flow velocity measurement system, which can measure the flow velocity of the primary air of the boiler in real time, so as to ensure that the boiler can operate efficiently, safely and stably for a long time.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: provided is a flow velocity measurement system which can measure the flow velocity of primary air of a boiler in real time, thereby ensuring that the boiler can operate efficiently, safely and stably for a long time.
In order to realize the purpose of the utility model, the utility model discloses a flow velocity measuring system, which comprises three differential pressure transmitters and a pitot tube; the pitot tube comprises a positive pressure pipe, a negative pressure pipe, a mounting flange, two branch pipes and two positive pressure inlet pipes; the positive pressure pipe and the negative pressure pipe are vertically installed on the installation flange in a penetrating mode, and the positive pressure pipe is located on the windward side of the negative pressure pipe; the mounting flange is provided with a mounting hole; a positive pressure branch pipe is obliquely communicated with the left side edge and the right side edge of the upper end part of the positive pressure leading pipe; the left side and the right side of the upper end part of the negative pressure leading pipe are obliquely communicated with each other to form a negative pressure branch pipe; a threaded plug is screwed on the upper end pipe orifice of the positive pressure branch pipe, the upper end pipe orifices of the two positive pressure branch pipes, the upper end pipe orifice of the negative pressure branch pipe and the upper end pipe orifices of the two negative pressure branch pipes; a pressure guiding connecting pipe is arranged on each of the six threaded plugs in a penetrating manner; the upper ends of the two branch pipes are respectively obliquely communicated and installed on the left side and the right side of the middle part of the positive pressure branch pipe and are positioned below the installation flange; the middle parts of the two positive pressure inlet pipes are respectively communicated and installed on the lower ends of the two branch pipes, and the positive pressure inlet pipes are parallel to the positive pressure guiding pipe; the windward sides of the lower end of the positive pressure leading pipe and the windward sides of the upper end and the lower end of the two positive pressure inlet pipes are provided with inclined notches; a main pipe ash removal mechanism for removing ash in the pipe is arranged in each of the positive pressure leading pipe and the negative pressure leading pipe; the upper end and the lower end of each positive pressure inlet pipe are provided with a branch pipe ash removal mechanism for removing ash in the pipes;
the positive pressure connecting pipes of the three differential pressure transmitters are respectively connected to the pressure guiding connecting pipes at the upper ends of the positive pressure branch pipes and the upper ends of the two positive pressure branch pipes, and the negative pressure connecting pipes of the three differential pressure transmitters are respectively connected to the pressure guiding connecting pipes at the upper ends of the negative pressure branch pipes and the upper ends of the two negative pressure branch pipes.
Furthermore, the positive pressure guiding pipe is positioned on the outer wall of the mounting flange, the negative pressure guiding pipe is positioned on the outer wall of the mounting flange, the outer walls of the two branch pipes and the outer walls of the two positive pressure inlet pipes are respectively coated with a ceramic protecting sleeve.
Furthermore, a transverse connecting column is arranged between the upper end of the positive pressure guiding pipe and the upper end of the negative pressure guiding pipe.
Further, the main pipe ash removal mechanism comprises a V-shaped rod, an upper connecting rod, a lower connecting rod and a twisting spring; two ends of the upper side of the V-shaped rod are fixed on the lower end part of the threaded plug; the upper end of the upper connecting rod is fixedly connected to the lower tip end of the V-shaped rod; the upper end of the twisting spring is sleeved and fixed on the lower end part of the upper connecting rod; the lower end of the twisting spring is sleeved and fixed on the upper end part of the lower connecting rod; the lower end of the lower connecting rod extends downwards to a pipe orifice at the lower end, and a pipe orifice ceramic sleeve is fixedly sleeved on the lower end part of the lower connecting rod.
Furthermore, an upper side fixing convex ring is arranged on the lower end part of the upper connecting rod; a lower side fixing convex ring is arranged on the upper end part of the lower connecting rod; the upper end and the lower end of the twisting spring are respectively fixed on the upper side fixed convex ring and the lower side fixed convex ring.
Furthermore, the tube-dividing ash removal mechanism comprises a supporting convex strip, a thin rod section and a thick rod section; the supporting convex strips are fixedly arranged on the inner wall of the pipe of the positive pressure inlet pipe; the thin rod section is vertically and fixedly arranged on the end part of the supporting convex strip and is positioned on the central axis of the positive pressure inlet pipe; the thick rod section is vertically extended and installed on the end part of the thin rod section, and the diameter of the thick rod section is larger than that of the thin rod section.
Furthermore, a vibrating ceramic sleeve is fixedly sleeved on the end part of the thick rod section at the pipe orifice.
Furthermore, the thin rod section and the thick rod section are sleeved with auxiliary springs, and one ends of the auxiliary springs are fixed to the end portions of the supporting convex strips.
Furthermore, sealing convex rings are arranged on the outer pipe wall of the pressure guiding connecting pipe at intervals.
The beneficial effects of the utility model reside in that: the main pipe ash removal mechanism can be used for performing rapping ash removal on the lower end pipe orifices of the positive pressure pipe and the negative pressure pipe, so that the influence of soot extrusion on measurement is prevented; the pipe orifices at the upper end and the lower end of the positive pressure inlet pipe can be cleaned by vibration by using the pipe dividing and dust cleaning mechanism, so that the influence of the extrusion of the ash on the measurement is prevented; the upper end and the lower end of the two positive pressure inlet pipes and the lower end of the positive pressure leading pipe are both provided with inclined notches, so that five positive pressure acquisition points can be realized, and the reliability of positive pressure acquisition is ensured; the three differential pressure transmitters are used for calculating the differential pressure in real time, so that the flow velocity of primary air of the boiler is measured and calculated in real time, and the power station boiler can operate efficiently, safely and stably for a long time.
Drawings
Fig. 1 is a schematic view of the windward side structure of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view at B-B in FIG. 1.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.
Example 1:
as shown in fig. 1-3, the utility model discloses a velocity of flow measurement system includes: three differential pressure transmitters and a pitot tube; the pitot tube comprises a positive pressure guide tube 1, a negative pressure guide tube 11, a mounting flange 5, two branch tubes 7 and two positive pressure inlet tubes 9; the positive pressure pipe 1 and the negative pressure pipe 11 are vertically installed on the installation flange 5 in a penetrating mode, and the positive pressure pipe 1 is located on the windward side of the negative pressure pipe 11; the mounting flange 5 is provided with a mounting hole 12; the left side and the right side of the upper end part of the positive pressure guiding pipe 1 are obliquely communicated with a positive pressure branch pipe 2; the left side and the right side of the upper end part of the negative pressure leading pipe 11 are obliquely communicated with a negative pressure branch pipe 3; a threaded plug 6 is screwed on the upper end pipe orifice of the positive pressure branch pipe 1, the upper end pipe orifices of the two positive pressure branch pipes 2, the upper end pipe orifice of the negative pressure branch pipe 11 and the upper end pipe orifices of the two negative pressure branch pipes 3; a pressure guiding connecting pipe 4 is arranged on each of the six threaded plugs 6 in a penetrating manner; the upper ends of the two branch pipes 7 are respectively obliquely communicated and arranged at the left side and the right side of the middle part of the positive pressure branch pipe 2 and are positioned below the mounting flange 5; the middle parts of the two positive pressure inlet pipes 9 are respectively communicated and installed on the lower ends of the two branch pipes 7, and the positive pressure inlet pipes 9 are parallel to the positive pressure guiding pipe 1; the windward side of the lower end of the positive pressure leading pipe 1 and the windward sides of the upper and lower ends of the two positive pressure inlet pipes 9 are provided with inclined notches 23; a main pipe ash removal mechanism for removing ash in the pipe is arranged in the positive pressure pipe 1 and the negative pressure pipe 11; the upper end and the lower end of the two positive pressure inlet pipes 9 are respectively provided with a branch pipe ash removal mechanism for removing ash in the pipes;
the positive pressure connecting pipes of the three differential pressure transmitters are respectively connected to the pressure guiding connecting pipes 4 at the upper ends of the positive pressure branch pipes 2 and the upper ends of the two positive pressure branch pipes 2, and the negative pressure connecting pipes of the three differential pressure transmitters are respectively connected to the pressure guiding connecting pipes 4 at the upper ends of the negative pressure branch pipes 11 and the upper ends of the two negative pressure branch pipes 3.
The main pipe ash removal mechanism can be used for performing rapping ash removal on the lower end pipe orifices of the positive pressure pipe 1 and the negative pressure pipe 11, so that the influence of soot extrusion on measurement is prevented; the pipe orifices at the upper end and the lower end of the positive pressure inlet pipe 9 can be cleaned by vibration by using the pipe-dividing and ash-cleaning mechanism, so that the influence of ash extrusion on measurement is prevented; the upper end and the lower end of the two positive pressure inlet pipes 9 and the lower end of the positive pressure leading pipe 1 are both provided with the inclined notches 23, so that five positive pressure collection points can be realized, and the reliability of positive pressure collection is ensured; the three differential pressure transmitters are used for calculating the differential pressure in real time, so that the flow velocity of primary air of the boiler is measured and calculated in real time, and the power station boiler can operate efficiently, safely and stably for a long time.
Furthermore, the ceramic protective sleeves 8 are respectively coated and arranged on the outer walls of the mounting flange 5 of the positive pressure leading pipe 1, the mounting flange 5 of the negative pressure leading pipe 11, the two branch pipes 7 and the two positive pressure inlet pipes 9. The ceramic protective sleeve 8 can reduce wear of the positive pressure pipe 1, the negative pressure pipe 11, the branch pipe 7, and the positive pressure inlet pipe 9.
Further, a transverse connecting column 13 is arranged between the upper end of the positive pressure guiding pipe 1 and the upper end of the negative pressure guiding pipe 11. The structural strength of the positive pressure introduction pipe 1 and the negative pressure introduction pipe 11 can be enhanced by the transverse connection column 13.
Further, the main pipe ash removal mechanism comprises a V-shaped rod 15, an upper connecting rod 16, a lower connecting rod 17 and a twisting spring 18; the two ends of the upper side of the V-shaped rod 15 are fixed on the lower end part of the threaded plug 6; the upper end of the upper connecting rod 16 is fixedly connected to the lower tip end of the V-shaped rod 15; the upper end of the twisting spring 18 is sleeved and fixed on the lower end part of the upper connecting rod 16; the lower end of the twisting spring 18 is sleeved and fixed on the upper end part of the lower connecting rod 17; the lower end of the lower connecting rod 17 extends downwards to a lower end pipe orifice, and a pipe orifice ceramic sleeve 19 is sleeved and fixed on the lower end part of the lower connecting rod 17. The windward swing effect of the lower connecting rod 17 can be ensured by using the torsion spring 18; the pipe orifice ceramic bushing 19 can reduce the abrasion of the lower connecting rod 17 and enhance the rapping strength of the lower connecting rod 17.
Further, an upper fixed convex ring 14 is arranged on the lower end part of the upper connecting rod 16; a lower side fixing convex ring 20 is arranged on the upper end part of the lower connecting rod 17; the upper and lower ends of the torsion spring 18 are fixed to the upper and lower fixed collars 14 and 20, respectively. The fixing strength of the upper and lower ends of the torsion spring 18 can be enhanced by the upper and lower fixing beads 14 and 20.
Further, the tube-dividing ash-cleaning mechanism comprises a supporting convex strip 24, a thin rod section 25 and a thick rod section 10; the supporting convex strips 24 are fixedly arranged on the inner wall of the positive pressure inlet pipe 9; the thin rod section 25 is vertically and fixedly arranged on the end part of the supporting convex strip 24, and the thin rod section 25 is positioned on the central axis of the positive pressure inlet pipe 9; the thick rod section 10 is mounted on the end of the thin rod section 25 in a vertically extending manner, and the diameter of the thick rod section 10 is larger than that of the thin rod section 25. The thin rod section 25 and the thick rod section 10 are matched, so that the thick rod section 10 can conveniently shake against the wind, the inner wall of the pipe of the positive pressure inlet pipe 9 is knocked, and the effect of knocking and cleaning dust is achieved.
Furthermore, a rapping ceramic sleeve 26 is sleeved and fixed on the end part of the thick rod section 10 at the pipe orifice. The use of the rapping ceramic sheath 26 enables to reduce the wear of the thick bar segment 10, as well as to enhance the rapping strength of the thick bar segment 10.
Further, the auxiliary spring 22 is fitted over the thin rod section 25 and the thick rod section 10, and one end of the auxiliary spring 22 is fixed to an end of the support rib 24. The auxiliary spring 22 can enhance the resilience of the slender rod section 25 when swinging against the wind.
Furthermore, sealing convex rings 21 are arranged on the outer pipe wall of the pressure guiding connecting pipe 4 at intervals. The sealing convex ring 21 can be used for enhancing the connection sealing performance of the positive pressure connecting pipe and the negative pressure connecting pipe.
In the flow velocity measuring system disclosed by the utility model, the rapping ceramic sleeve 26, the pipe orifice ceramic sleeve 19 and the ceramic protecting sleeve 8 are all made of wear-resistant ceramic materials; the differential pressure transmitter adopts the existing differential pressure transmitter with the model number of 3051, and the specific calculation formula when the flow velocity calculation is carried out is as follows (the transmitter range is 1.5 Kpa):
in the formula: w is the flow velocity in the air duct, and the unit is m/s; delta P is the differential pressure output by the differential pressure transmitter, and the unit is Pa; k is the total coefficient of the flow velocity measurement system, the design value and the actual calibration result on site are comprehensively substituted into calculation, and after formal calibration, the value can be further corrected and is a conventional parameter in the field; t is the temperature in the primary air pipe at the outlet of the coal mill, and the unit is; PA is the local atmospheric compaction measurement in Pa; px is the pressure in the primary air pipe at the outlet of the coal mill and has the unit of Pa.
When (smoke) airflow flows in the pipe, the windward side is impacted by the (smoke) airflow, and the kinetic energy of the (smoke) airflow is converted into pressure energy at the position, so that the internal pressure of the positive pressure pipe 1 and the two positive pressure inlet pipes 9 at the windward side is higher, the pressure is called as 'full pressure', the negative pressure pipe 11 at the leeward side is not impacted by the (smoke) airflow, the pressure in the negative pressure pipe 11 is the static pressure in the air pipe, the pressure is called as 'static pressure', the difference between the full pressure and the static pressure is called as differential pressure, the magnitude of the differential pressure is related to the flow velocity in the pipe, and the larger the flow velocity is, the larger the; the flow velocity is small and the differential pressure is small.
The utility model discloses an innovation point lies in the improvement in the aspect of the pitot tube structure, and what data acquisition and processing in the aspect of the pressure differential transmitter adopted is prior art.
As mentioned above, although the present invention has been shown and described with reference to certain preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A flow rate measurement system, characterized by: comprises three differential pressure transmitters and a pitot tube; the pitot tube comprises a positive pressure guide tube (1), a negative pressure guide tube (11), a mounting flange (5), two branch tubes (7) and two positive pressure inlet tubes (9); the positive pressure pipe (1) and the negative pressure pipe (11) are vertically installed on the installation flange (5) in a penetrating mode, and the positive pressure pipe (1) is located on the windward side of the negative pressure pipe (11); a mounting hole (12) is arranged on the mounting flange (5); the left side and the right side of the upper end part of the positive pressure guiding pipe (1) are obliquely communicated with a positive pressure branch pipe (2); the left side and the right side of the upper end part of the negative pressure leading pipe (11) are obliquely communicated with a negative pressure branch pipe (3); a threaded plug (6) is screwed on the upper end pipe orifice of the positive pressure pipe (1), the upper end pipe orifices of the two positive pressure branch pipes (2), the upper end pipe orifice of the negative pressure pipe (11) and the upper end pipe orifices of the two negative pressure branch pipes (3); a pressure guiding connecting pipe (4) is arranged on each of the six threaded plugs (6) in a penetrating manner; the upper ends of the two branch pipes (7) are respectively obliquely communicated and installed on the left side and the right side of the middle part of the positive pressure branch pipe (2) and are positioned below the installation flange (5); the middle parts of the two positive pressure inlet pipes (9) are respectively communicated and installed on the lower ends of the two branch pipes (7), and the positive pressure inlet pipes (9) are parallel to the positive pressure guiding pipe (1); the windward side of the lower end of the positive pressure leading pipe (1) and the windward sides of the upper and lower ends of the two positive pressure inlet pipes (9) are both provided with inclined notches (23); a main pipe ash removal mechanism for removing ash in the pipe is arranged in the positive pressure guide pipe (1) and the negative pressure guide pipe (11); the upper end and the lower end of the two positive pressure inlet pipes (9) are respectively provided with a branch pipe ash removal mechanism for removing ash in the pipes;
the positive pressure connecting pipes of the three differential pressure transmitters are respectively connected to the pressure guiding connecting pipes (4) at the upper ends of the positive pressure branch pipes (2) and the upper ends of the two positive pressure branch pipes (2), and the negative pressure connecting pipes of the three differential pressure transmitters are respectively connected to the pressure guiding connecting pipes (4) at the upper ends of the negative pressure guiding pipes (11) and the upper ends of the two negative pressure branch pipes (3).
2. The flow rate measurement system according to claim 1, wherein: the positive pressure guiding pipe (1) is positioned on the outer wall of the mounting flange (5), the negative pressure guiding pipe (11) is positioned on the outer wall of the mounting flange (5), the outer walls of the two branch pipes (7) and the outer walls of the two positive pressure inlet pipes (9) are respectively coated with a ceramic protecting sleeve (8).
3. The flow rate measurement system according to claim 1, wherein: a transverse connecting column (13) is arranged between the upper end of the positive pressure guiding pipe (1) and the upper end of the negative pressure guiding pipe (11).
4. The flow rate measurement system according to claim 1, wherein: the main pipe ash removal mechanism comprises a V-shaped rod (15), an upper connecting rod (16), a lower connecting rod (17) and a twisting spring (18); two ends of the upper side of the V-shaped rod (15) are fixed on the lower end part of the threaded plug (6); the upper end of the upper connecting rod (16) is fixedly connected to the lower tip end of the V-shaped rod (15); the upper end of the twisting spring (18) is sleeved and fixed on the lower end part of the upper connecting rod (16); the lower end of the twisting spring (18) is sleeved and fixed on the upper end part of the lower connecting rod (17); the lower end of the lower connecting rod (17) extends downwards to a pipe orifice at the lower end, and a pipe orifice ceramic sleeve (19) is sleeved and fixed on the lower end part of the lower connecting rod (17).
5. The flow rate measurement system according to claim 4, wherein: an upper side fixing convex ring (14) is arranged on the lower end part of the upper connecting rod (16); a lower side fixing convex ring (20) is arranged on the upper end part of the lower connecting rod (17); the upper end and the lower end of the twisting spring (18) are respectively fixed on the upper side fixed convex ring (14) and the lower side fixed convex ring (20).
6. The flow rate measurement system according to claim 1, wherein: the tube-dividing ash removal mechanism comprises a supporting convex strip (24), a thin rod section (25) and a thick rod section (10); the supporting convex strips (24) are fixedly arranged on the inner wall of the positive pressure inlet pipe (9); the thin rod section (25) is vertically and fixedly arranged on the end part of the supporting convex strip (24), and the thin rod section (25) is positioned on the central axis of the positive pressure inlet pipe (9); the thick rod section (10) is vertically extended and installed on the end part of the thin rod section (25), and the diameter of the thick rod section (10) is larger than that of the thin rod section (25).
7. The flow rate measurement system according to claim 6, wherein: a vibrating ceramic sleeve (26) is sleeved and fixed on the end part of the thick rod section (10) at the pipe orifice.
8. The flow rate measurement system according to claim 6, wherein: the thin rod section (25) and the thick rod section (10) are sleeved with auxiliary springs (22), and one ends of the auxiliary springs (22) are fixed on the end portions of the supporting convex strips (24).
9. The flow rate measurement system according to claim 1, wherein: sealing convex rings (21) are arranged on the outer pipe wall of the pressure guiding connecting pipe (4) at intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021199276.4U CN212228978U (en) | 2020-06-25 | 2020-06-25 | Flow velocity measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021199276.4U CN212228978U (en) | 2020-06-25 | 2020-06-25 | Flow velocity measuring system |
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| Publication Number | Publication Date |
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| CN212228978U true CN212228978U (en) | 2020-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021199276.4U Active CN212228978U (en) | 2020-06-25 | 2020-06-25 | Flow velocity measuring system |
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| CN (1) | CN212228978U (en) |
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2020
- 2020-06-25 CN CN202021199276.4U patent/CN212228978U/en active Active
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