CN212585953U - Accurate measurement system for complex flow field of large air duct of boiler - Google Patents
Accurate measurement system for complex flow field of large air duct of boiler Download PDFInfo
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- CN212585953U CN212585953U CN202020955477.6U CN202020955477U CN212585953U CN 212585953 U CN212585953 U CN 212585953U CN 202020955477 U CN202020955477 U CN 202020955477U CN 212585953 U CN212585953 U CN 212585953U
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Abstract
The utility model discloses a boiler large air duct complex flow field accurate measurement system, which comprises a micro differential pressure transmitter and a monitoring host machine which are connected by signals; the device also comprises at least one positive pressure device and at least one negative pressure device; the positive pressure taking device comprises a positive pressure equalizing main pipe and a positive pressure sensing device, wherein a pressure taking port of the positive pressure sensing device is opposite to the incoming flow direction, and a pressure stabilizing cavity of the positive pressure sensing device is hermetically connected with the inner cavity of the positive pressure equalizing main pipe; the negative pressure taking device comprises a negative pressure equalizing main pipe and a negative pressure sensing device, and the negative pressure sensing device is a double-venturi tube; the pressure guiding pipe in the double-venturi pipe is communicated with the inner cavity of the negative pressure equalizing main pipe, and the opening of the outer venturi pipe in the double-venturi pipe faces back to the incoming flow direction. The utility model discloses possess from the deashing and prevent blockking up the function, the device dependable performance, the amount of wind shows stably, can be used to the complicated flow field accurate measurement amount of wind in the big wind channel of boiler.
Description
Technical Field
The utility model relates to an amount of wind measuring device, concretely relates to complicated flow field measurement system of big wind channel of boiler.
Background
With the increase of the unit capacity of the thermal power plant and the improvement of the automatic control technology, the power station unit realizes on-line monitoring and automatic coordination control; the accurate measurement of the air quantity of the utility boiler is the basis for realizing the on-line monitoring and automatic coordination control of the load, the fuel quantity, the air distribution quantity and the like of the boiler.
At present, most of the differential pressure type flow meters commonly used for boiler pipeline measurement adopt a pitot tube principle, a probe is inserted into the center of a pipeline, a total pressure hole is aligned with the incoming flow direction of a fluid, a negative pressure hole is aligned with the outgoing flow direction of the fluid, the difference between the total pressure and the negative pressure is the actually measured differential pressure at the center of the pipeline, then a wind tunnel calibration curve of the probe is used for fitting the standard differential pressure at the point, and the flow of the fluid is calculated according to the standard differential pressure. Under the condition of reasonable arrangement, the measurement accuracy and the reliability of the prior art can generally meet the control requirement of a boiler unit. However, some boiler units are not arranged reasonably due to field conditions or other reasons, so that the deviation of air quantity measurement is too large, the air quantity, the fuel quantity and the boiler load cannot be matched, the reasonable optimal matching of air and coal cannot be kept, and the combustion working condition of the boiler and the safe, stable and economic operation of the whole unit are seriously influenced. Meanwhile, because the primary air, the secondary air and the powder making air are all dusty air flows, dust in the wind measuring device can not enter, the wind measuring device is easy to block, and the problem of blocking of a measuring element can not be solved all the time, so that the thermal maintenance workload is large, and the pressure loss of some wind measuring devices is also large.
Therefore, a precise measurement system for the complex flow field of the large air duct of the boiler, which has the advantages of pressure loss as small as possible, dust self-cleaning and anti-blocking functions and stable air quantity display, is needed.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a complicated flow field measurement system in big wind channel of boiler of simple structure, convenient to use.
In order to solve the technical problem, the utility model provides a boiler large air duct complex flow field accurate measurement system, which comprises a micro differential pressure transmitter and a monitoring host machine which are connected by signals, wherein a positive pressure device and a negative pressure device are respectively connected with the micro differential pressure transmitter;
the positive pressure taking device comprises a positive pressure equalizing main pipe and a positive pressure sensing device; the positive pressure equalizing main pipe is a slender hollow pipe, the head end of the positive pressure equalizing main pipe is closed, the tail end of the positive pressure equalizing main pipe is provided with a drain pipe, one end of the drain pipe is communicated with the inner cavity of the positive pressure equalizing main pipe, and the other end of the drain pipe is provided with a drain pipe choke plug; a positive pressure signal output port is arranged on the pipe wall of the positive pressure equalizing main pipe; the inner cavity of the positive pressure equalizing main pipe is hermetically connected with the micro differential pressure transmitter sequentially through the positive pressure signal output port and the pressure guide pipe I;
at least two positive pressure sensing devices are uniformly arranged on the outer pipe wall of the positive pressure equalizing main pipe at intervals; the positive pressure sensing device is an L-shaped pipe and consists of a vertical side, a connecting piece and a transverse side which are sequentially connected in a sealing manner; the vertical side, the connecting piece and the transverse side are square tubes with hollow interiors, the vertical side and the transverse side are mutually vertical, and the connecting piece forms included angles with the vertical side and the transverse side; the upper opening of the vertical side is a pressure taking opening made of wear-resistant materials, the right opening of the transverse side is an outlet, and the pressure taking opening and the outlet are vertical to each other; a V-shaped baffle is arranged right opposite to the outlet; the V-shaped baffle keeps a distance with the outlet; a pressure stabilizing cavity opening is arranged on the vertical side, one end of the pressure stabilizing cavity is hermetically connected with the inner cavity of the vertical side through the pressure stabilizing cavity opening, and the other end of the pressure stabilizing cavity is hermetically connected with the inner cavity of the positive pressure equalizing main pipe; the pressure stabilizing cavity and the outlet are respectively positioned at two sides of the vertical side;
the negative pressure taking device comprises a negative pressure equalizing main pipe and a negative pressure sensing device, the negative pressure equalizing main pipe is a slender hollow pipe, the head end of the negative pressure equalizing main pipe is closed, and the tail end of the negative pressure equalizing main pipe is provided with a drain outlet choke plug;
a negative pressure signal output port is arranged on the pipe wall of the negative pressure equalizing main pipe; the inner cavity of the negative pressure equalizing main pipe is hermetically connected with the micro differential pressure transmitter sequentially through a negative pressure signal output port and a pressure guide pipe II;
at least two negative pressure sensing devices are uniformly arranged on the outer pipe wall of the negative pressure equalizing main pipe at intervals; the negative pressure sensing device is a double-venturi tube (double-throat-diameter venturi tube); the pressure guiding pipe in the double-venturi pipe is communicated with the inner cavity of the negative pressure equalizing main pipe in a sealing way.
As the utility model discloses a complicated flow field accurate measurement system's of big wind channel of boiler improvement:
the pipe diameter of the blow-off pipe is smaller than that of the positive pressure equalizing main pipe.
As the utility model discloses a complicated flow field accurate measurement system's of big wind channel of boiler further improvement:
the pressure stabilizing cavity opening is close to the pressure taking opening.
As the utility model discloses a complicated flow field accurate measurement system's of big wind channel of boiler further improvement:
and the outer pipe wall of the negative pressure equalizing main pipe is provided with a mounting flange II.
The boiler large air duct complex flow field accurate measurement system is further improved:
the negative pressure sampling device also comprises an L-shaped fixed support connected with the negative pressure equalizing main pipe, and the long edge of the L-shaped fixed support is parallel to the negative pressure equalizing main pipe; each negative pressure sensing device is fixedly connected with the long edge of the L-shaped fixed support.
When the utility model is used in practice, the positive pressure device and the negative pressure device are separately arranged in the air pipe of the air duct to be measured, and the pressure tapping of the positive pressure device is opposite to the incoming flow direction; the opening of an outer Venturi tube of the negative pressure taking device faces back to the incoming flow direction;
the utility model discloses the technical advantage who compares with present traditional differential pressure formula flowmeter does:
1. blocking prevention: in the pressure tapping process, the inlet of the positive pressure tapping device can generate high-speed vortex to separate dust, so that the dust basically does not enter the measuring device, the dust blocking phenomenon can not occur in the operation to influence the measurement, and the positive pressure tapping device becomes a long-term maintenance-free product;
2. stable performance and accurate measurement: the utility model adopts multi-point pressure measurement on the cross section of the pipeline, evenly distributes each pressure measurement point according to the size of the pipeline, ensures the stability and accuracy of measurement, and truly reflects the air volume condition;
3. signal amplification: the negative pressure measuring device of the utility model adopts double Venturi tubes (double throat diameter Venturi tubes), the air flow is compressed for two times inside and outside, so that larger negative pressure appears in the Venturi tubes, the signal of the measuring device is amplified in multiple ways, and larger differential pressure can be obtained at the minimum flow velocity, so as to ensure the sensitivity of measurement;
4. the method is suitable for various field installation environments: the positive pressure device and the negative pressure device of the utility model can be separately arranged, and can be provided with a positive pressure device and a negative pressure device, and also can be provided with a plurality of positive pressure devices and matched negative pressure devices; the mode is flexible, and the straight pipe section of the air duct only needs to be longer than the equivalent diameter of the pipeline;
5. energy conservation: the plug-in arrangement is adopted, and for the whole large air duct, the wind shielding areas of the positive pressure taking device and the negative pressure taking device can be almost ignored, so that the pressure loss of the whole air duct fluid is almost zero, the energy-saving effect is very remarkable, and the installation is convenient.
To sum up, the utility model discloses a big wind channel of boiler complicated flow field accurate measurement system does not have the pressure loss almost, possesses from the deashing and prevents blockking up the function, and the device dependable performance, amount of wind show stably, are the non-maintaining product that is fit for large-scale production and application.
Drawings
The following describes the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic view of the complex flow field accurate measurement system of the large air duct of the boiler of the present invention;
fig. 2 is a schematic structural diagram of the positive pressure measurement device 100 in fig. 1;
in fig. 2, the upper view is a plan view and the lower view is a front view;
fig. 3 is a schematic structural view of the positive pressure sensing device 2 in fig. 2;
in fig. 3, the upper left is a front view; the upper right is a left view; the lower is a top view.
Fig. 4 is a schematic structural diagram of the negative pressure extracting device 200 in fig. 1.
Detailed Description
The positive pressure sampling device 100 comprises a positive pressure equalizing main pipe 1 and a positive pressure sensing device 2; the female pipe of malleation pressure-sharing 1 is long and thin hollow tube, and the head end of the female pipe of malleation pressure-sharing 1 is sealed, and the tail end of the female pipe of malleation pressure-sharing 1 is provided with the drain pipe 12 that a diameter ratio malleation pressure-sharing 1 is little, and the one end and the female pipe 1 inner chamber of malleation pressure-sharing of drain pipe 12 communicate, and the other end is provided with drain pipe bulkhead 13, and drain pipe bulkhead 13 is in the encapsulated situation usually, opens when necessary and is used for the accumulated dust discharge of the female pipe 1 inner chamber of malleation pressure-sharing, drain. Therefore, the positive pressure equalizing main pipe 1, the sewage discharge pipe 12 and the sewage discharge pipe choke plug 13 form a hollow pipe with two closed ends.
At least two positive pressure sensing devices 2 are uniformly arranged on the outer pipe wall of the positive pressure equalizing main pipe 1 at intervals; a positive pressure signal output port 11 is arranged on the pipe wall close to the head end of the positive pressure equalizing main pipe 1, one end of the positive pressure signal output port 11 is communicated with the inner cavity of the positive pressure equalizing main pipe 1, and the other end of the positive pressure signal output port is connected with the micro differential pressure transmitter 300 through a pressure guide pipe I101 in a sealing mode.
And the mounting flange I14 is arranged on the outer pipe wall of the positive pressure equalizing main pipe 1 and is used for mounting the positive pressure equalizing main pipe 1 on the pipe wall of a boiler pipeline to be measured.
The positive pressure sensing device 2 is of an L-shaped tubular structure and consists of a vertical side 2-1, a transverse side 2-2 and a connecting piece 21 as shown in figure 3; the vertical side 2-1, the transverse side 2-2 and the connecting piece 21 are all of a square tubular structure with a hollow interior; two ends of the connecting piece 21 are respectively connected with the vertical side 2-1 and the transverse side 2-2 in a sealing way. The connecting piece 21 forms an angle with both the vertical side 2-1 and the lateral side 2-2, for example an angle of 45 °.
The upper end opening of the vertical side 2-1 is a pressure taking opening 22 made of wear-resistant materials, the right side opening of the transverse side 2-2 is an outlet 26, and the pressure taking opening 22 and the outlet 26 are vertical to each other; a V-shaped baffle 25 is arranged right opposite to the outlet 26; the tip of the V-shaped baffle 25 faces the outlet 26 and coincides with the center line of the outlet 26. The V-shaped baffle 25 is spaced from the outlet 26.
A pressure stabilizing cavity opening 23 is arranged on the vertical side 2-1 near the pressure taking opening 22, one end of the pressure stabilizing cavity 24 is connected with the inner cavity of the vertical side 2-1 in a sealing way through the pressure stabilizing cavity opening 23, and the other end of the pressure stabilizing cavity 24 is connected with the inner cavity of the positive pressure equalizing main pipe 1 in a sealing way; plenum 24 and outlet 26 are located on either side of vertical side 2-1.
The negative pressure taking device 200 comprises a negative pressure equalizing main pipe 3, a fixed bracket 3-1 and a negative pressure sensing device 4; the negative pressure equalizing main pipe 3 is a slender hollow pipe, the head end of the negative pressure equalizing main pipe 3 is closed, the tail end of the negative pressure equalizing main pipe 3 is provided with a drain port choke plug 32, the drain port choke plug 32 is normally closed, and the drain port choke plug 32 is opened when necessary to discharge the accumulated dust in the inner cavity of the negative pressure equalizing main pipe 3; therefore, the negative pressure equalizing main pipe 3 and the sewage discharge port choke plug 32 form a hollow pipe with two closed ends.
A negative pressure signal output port 31 is arranged on the pipe wall of the negative pressure equalizing main pipe 3 close to the head end, one end of the negative pressure signal output port 31 is communicated with the inner cavity of the negative pressure equalizing main pipe 3, and the other end of the negative pressure signal output port 31 is connected with the micro differential pressure transmitter 300 through a pressure guide pipe II 201 in a sealing mode.
And the mounting flange II34 is arranged on the outer pipe wall of the negative pressure equalizing main pipe 3 and is used for mounting the negative pressure equalizing main pipe 3 on the pipe wall of the boiler pipeline to be measured.
The fixing support 3-1 is L-shaped, one end of the fixing support is fixed on the negative pressure equalizing main pipe 3, the other end of the fixing support is fixedly connected with the mounting flange II34, and the long edge of the fixing support 3-1 is parallel to the negative pressure equalizing main pipe 3.
At least two negative pressure sensing devices 4 are uniformly arranged on the outer pipe wall of the negative pressure equalizing main pipe 3 at intervals; the negative pressure sensing device 4 is a conventional double venturi tube; comprises a pressure guide pipe, an outer Venturi tube and an inner Venturi tube; the pressure guiding pipe in the double-venturi pipe is communicated with the inner cavity of the negative pressure equalizing main pipe 3 in a sealing way. Each negative pressure sensing device 4 is fixedly connected with the long edge of the L-shaped fixed support 3-1. Therefore, the L-shaped fixing bracket 3-1 plays a role in fixing the negative pressure sensing device 4;
it should be noted that the dual venturi tube, micro differential pressure transmitter 300 and monitoring host 400 are prior art, and the internal structure and implementation principle thereof will not be described in detail herein.
The application method of the boiler large air duct complex flow field accurate measurement system comprises the following steps:
1. the positive pressure device 100 and the negative pressure device 200 are arranged in an air pipe of an air duct to be measured, the positive pressure device 100 and the negative pressure device 200 can be arranged separately and should be arranged on a straight pipe section of the air pipe as much as possible, and a pressure port 22 of the positive pressure device 100 should be aligned to the incoming flow direction, so that dust-containing air flows in; the opening of the outer venturi tube in the double venturi tube of the negative pressure taking device 200 faces back to the incoming flow direction, so as to obtain a negative pressure signal; when the section of the measured air duct is large and the flow velocity is not uniformly distributed on the section, in order to ensure the measurement accuracy, a plurality of positive pressure devices 100 and negative pressure devices 200 can be arranged at multiple points with equal sections, then the pressure pipes i 101 are collected and connected with the micro differential pressure transmitter 300, and similarly, the pressure pipes ii 201 are collected and connected with the micro differential pressure transmitter 300. The number of the positive pressure devices 100 and the negative pressure devices 200 should be equal.
The method comprises the following specific steps:
the pressure taking port 22 is opposite to the direction of the air flow, the air flow enters the inner cavity of the positive pressure sensing device 2 from the pressure taking port 22 and is blocked by the inclined connecting piece 21 to generate a high-speed vortex, dust is separated, the air flow vortex containing a small amount of dust enters the inner cavity of the positive pressure equalizing main pipe 1 after passing through the pressure stabilizing port 23 and the pressure stabilizing cavity 24, and the dust in the air flow moves to the outlet 26 of the transverse side 2-2 and is discharged and is blocked by the V-shaped baffle 25 to turn 90 degrees; therefore, dust is separated during measurement, the possibility that dust is flushed into the inner cavity of the positive pressure equalizing main pipe 1 by inertia is avoided, and the defects that in the measurement process of the existing differential pressure type flowmeter, the impurity content is high, and a pressure tapping hole is easy to block are fundamentally solved.
Each positive pressure sensing device 2 gathers the air current (air current with pressure) that each got to the pressure equalizing main pipe 1 of malleation, then carries the pressure equalizing main pipe 1 of malleation through pressure pipe I101 in the pressure guide pipe I101 that seals from the signal output port 11 of malleation together and carries the micro differential pressure transmitter 300. When a plurality of positive pressure devices 100 are provided, the air flows of the pressure guide pipes I101 are collected and then are transmitted to the micro differential pressure transmitter 300.
The opening of the outer Venturi tube of the negative pressure sensing device 4 (double Venturi tubes) is back to the direction of air flow, the air flow of the collected negative pressure signal is converged into the negative pressure equalizing main pipe 3 through the pressure guiding pipe in the double Venturi tubes, and then the air flow is conveyed into the micro differential pressure transmitter 300 through the pressure guiding pipe II 201 sealed from the negative pressure signal output port 31. When a plurality of negative pressure sampling devices 200 are arranged, the air flows of the pressure guide pipes II 201 are collected and then are transmitted to the micro differential pressure transmitter 300.
2. According to the conventional technology, the micro differential pressure transmitter 300 converts the pressure signal into an electric signal and transmits the electric signal to the monitoring host 400; the monitoring host 400 calculates the air volume value in the pipeline according to the electric signal of the pressure, the temperature and humidity environmental data in the pipeline and other information.
Finally, it is also noted that the above-mentioned list is only a few specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and many modifications are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the invention should be considered as within the scope of the invention.
Claims (5)
1. The accurate measurement system of the complicated flow field of the large air duct of the boiler, including the little differential pressure transmitter (300) and monitoring host computer (400) that the signal links up; the method is characterized in that: the device also comprises at least one positive pressure device (100) and at least one negative pressure device (200);
the positive pressure sampling device (100) comprises a positive pressure equalizing main pipe (1) and a positive pressure sensing device (2); the positive pressure equalizing main pipe (1) is a slender hollow pipe, the head end of the positive pressure equalizing main pipe (1) is closed, the tail end of the positive pressure equalizing main pipe (1) is provided with a sewage discharge pipe (12), one end of the sewage discharge pipe (12) is communicated with the inner cavity of the positive pressure equalizing main pipe (1), and the other end of the sewage discharge pipe is provided with a sewage discharge pipe choke plug (13); a positive pressure signal output port (11) is arranged on the pipe wall of the positive pressure equalizing main pipe (1); the inner cavity of the positive pressure equalizing main pipe (1) is connected with the micro differential pressure transmitter (300) in a sealing way through a positive pressure signal output port (11) and a pressure guide pipe I (101) in sequence;
at least two positive pressure sensing devices (2) are uniformly arranged on the outer pipe wall of the positive pressure equalizing main pipe (1) at intervals; the positive pressure sensing device (2) is an L-shaped pipe and consists of a vertical side (2-1), a connecting piece (21) and a transverse side (2-2) which are sequentially connected in a sealing manner; the vertical side (2-1), the connecting piece (21) and the transverse side (2-2) are square tubes with hollow interiors, the vertical side (2-1) and the transverse side (2-2) are mutually vertical, and the connecting piece (21) forms included angles with the vertical side (2-1) and the transverse side (2-2); the upper end opening of the vertical side (2-1) is a pressure taking opening (22) made of wear-resistant material, the right side opening of the transverse side (2-2) is an outlet (26), and the pressure taking opening (22) and the outlet (26) are mutually vertical; a V-shaped baffle (25) is arranged at the position opposite to the outlet (26); the V-shaped baffle (25) keeps a distance with the outlet (26); a pressure stabilizing cavity opening (23) is arranged on the vertical side (2-1), one end of the pressure stabilizing cavity (24) is hermetically connected with the inner cavity of the vertical side (2-1) through the pressure stabilizing cavity opening (23), and the other end of the pressure stabilizing cavity (24) is hermetically connected with the inner cavity of the positive pressure equalizing main pipe (1); the pressure stabilizing cavity (24) and the outlet (26) are respectively positioned at two sides of the vertical side (2-1);
the negative pressure taking device (200) comprises a negative pressure equalizing main pipe (3) and a negative pressure sensing device (4), the negative pressure equalizing main pipe (3) is a slender hollow pipe, the head end of the negative pressure equalizing main pipe (3) is closed, and the tail end of the negative pressure equalizing main pipe (3) is provided with a drain choke plug (32);
a negative pressure signal output port (31) is arranged on the pipe wall of the negative pressure equalizing main pipe (3); the inner cavity of the negative pressure equalizing main pipe (3) is connected with the micro differential pressure transmitter (300) in a sealing way through the negative pressure signal output port (31) and the pressure guide pipe II (201) in sequence;
at least two negative pressure sensing devices (4) are uniformly arranged on the outer pipe wall of the negative pressure equalizing main pipe (3) at intervals; the negative pressure sensing device (4) is a double venturi tube; the pressure guiding pipe in the double-venturi pipe is communicated with the inner cavity of the negative pressure equalizing main pipe (3) in a sealing way.
2. The precise measurement system for the complex flow field of the large air duct of the boiler according to claim 1, characterized in that:
the pipe diameter of the sewage discharge pipe (12) is smaller than that of the positive pressure equalizing main pipe (1).
3. The precise measurement system for the complex flow field of the large air duct of the boiler according to claim 2, characterized in that:
the pressure stabilizing cavity opening (23) is close to the pressure taking opening (22).
4. The boiler large air duct complex flow field accurate measurement system according to any one of claims 1 to 3, characterized in that:
an installation flange I (14) is arranged on the outer pipe wall of the positive pressure equalizing main pipe (1), and an installation flange II (34) is arranged on the outer pipe wall of the negative pressure equalizing main pipe (3).
5. The precise measurement system for the complex flow field of the large air duct of the boiler according to claim 4, characterized in that:
the negative pressure sampling device (200) further comprises an L-shaped fixed support (3-1) connected with the negative pressure equalizing main pipe (3), and the long edge of the L-shaped fixed support (3-1) is parallel to the negative pressure equalizing main pipe (3); each negative pressure sensing device (4) is fixedly connected with the long side of the L-shaped fixed support (3-1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020955477.6U CN212585953U (en) | 2020-05-30 | 2020-05-30 | Accurate measurement system for complex flow field of large air duct of boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020955477.6U CN212585953U (en) | 2020-05-30 | 2020-05-30 | Accurate measurement system for complex flow field of large air duct of boiler |
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| CN212585953U true CN212585953U (en) | 2021-02-23 |
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| CN202020955477.6U Expired - Fee Related CN212585953U (en) | 2020-05-30 | 2020-05-30 | Accurate measurement system for complex flow field of large air duct of boiler |
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2020
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