CN106525172B - A kind of power station wind and smoke road flow measurement device - Google Patents
A kind of power station wind and smoke road flow measurement device Download PDFInfo
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- CN106525172B CN106525172B CN201611022234.1A CN201611022234A CN106525172B CN 106525172 B CN106525172 B CN 106525172B CN 201611022234 A CN201611022234 A CN 201611022234A CN 106525172 B CN106525172 B CN 106525172B
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- smoke
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
- G01F1/88—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure with differential-pressure measurement to determine the volume flow
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- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a kind of power station wind and smoke road flow measurement devices, including access road, total pressure region, static pressure field, pressure difference transmitter and DCS system, and the device is set in wind and smoke road.Access road and total pressure region are the rectangular channel arranged vertically along wind and smoke flow direction, and the two fits along the direction perpendicular to wind and smoke flowing；It is opened between access road and total pressure region by barrier partitions, and there are one section of connected regions at the tail end of access road；Static pressure field is a rectangular channel and is set on the outside of access road and the tail end in total pressure region that the tail end of static pressure field is opening；Connect on pressure difference transmitter there are two test tube is pressed, is arranged in the front center of total pressure region and static pressure field, and stable pressure difference is exported to DCS system and converted by pressure difference transmitter.The configuration of the present invention is simple and cost is relatively low, effectively increases the stability and accuracy of wind and smoke road flow measurement device, ensure that the safety and economy of generating set operation.
Description
Technical field
The present invention relates to a kind of power station wind and smoke road flow measurement devices, belong to Power Plant Thermal field of measuring technique.
Background technique
With the progress of control technology, the load of station boiler, fuel quantity and on-line monitoring is realized with air quantity, but by
In apparatus for measuring air quantity type selecting or the air duct arrangement reasons such as unreasonable, cause air measuring inaccurate, so as to cause fuel quantity with
And load control and actual air volume there are biggish deviation, a series of problems, such as causing unstable combustion, boiler efficiency decline, because
The accurate measurement of this air quantity just seems even more important.
Theory and practice proves, when apparatus for measuring air quantity is in steady flow condition, passes through the flow of sectional area where it
In a linear relationship with the square root of its pressure difference provided, apparatus for measuring air quantity is exactly to converse reality according to the pressure difference of its offer
Air quantity.Measuring cell used in boiler draft measurement is nonstandard element, and the calibration by standardization is needed before use, is determined
Its discharge coefficient.
Air measuring is carried out using above-mentioned principle, apparatus for measuring air quantity is required to and is in metastable flow field, and is flowed
The stabilization of field has inseparable relationship with the arrangement in air duct, and conventional technique scheme is stayed in the upstream of apparatus for measuring air quantity
There are enough straight pipes, wind tends to opposite stabilization by straight pipe flow field.
Currently, power boiler air capacity measuring apparatus mainly has venturi, wing, flute type pipe, more larynx diameter venturi etc., these
The difference of measuring condition required by measuring device, but have a common ground, that is, require locating flow field stable as far as possible.But
It is that since air duct of thermal power plant sectional dimension is larger, and arrangement is limited by space, and there are more corner, support rods etc., cause air duct
Interior flow field extremely disorder, therefore apparatus above is difficult to realize accurately measure.
A series of the problem of above-mentioned puzzlement air measurings, equally exists in flue gas flow fields of measurement, and due to flue gas
Dust-laden, flue gas flow measuring device are also contemplated that the problem of anti-blocking ash.
Just because of above-mentioned various reasons, the flow measurement device reliability in thermal power plant many places wind and smoke road is lower at present, cannot
The requirement for meeting boiler automatic control system influences the safety and economy of generating set operation.Therefore, those skilled in the art
Member is dedicated to developing a kind of power station wind and smoke road flow measurement device, realizes the reliability and accuracy of wind and smoke road flow measurement device
Deng requirement.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of survey of power station wind and smoke road flow
Device is measured, has the characteristics that structure is simple, cost is relatively low, easy to operate, and wind and smoke road flow measurement device can be effectively improved
Stability and accuracy, thus ensure that generating set operation safety and economy.
Technical solution: to achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of power station wind and smoke road flow measurement device, including access road, total pressure region, static pressure field, pressure difference transmitter
And DCS system (Distributed Control System), and the device is set in wind and smoke road；
Wherein, the access road and total pressure region are the rectangular channel arranged vertically along wind and smoke flow direction, the two
It fits along the direction perpendicular to wind and smoke flowing；Access road is opening towards the side of wind and smoke direction of flow, and the other side is
It tail end and is at the same level with the tail end in total pressure region；It is opened between access road and total pressure region by barrier partitions, and logical in entrance
There are one section of connected regions at the tail end in road.
Fluid flows into access road along wind and smoke road and hits wall in the access road end, thus extrusion fluid, it will
Pressure is transferred to total pressure region；Since the height of access road is consistent with wind flue height, and total pressure channel is deposited with access road
In 180 ° of corners, even if fluid is also at no flow regime in total pressure region, therefore in total pressure region in the flow field of disorder
The available stable pressure value in portion.
The static pressure field is a rectangular channel, and is set on the outside of access road and the tail end in total pressure region；Static pressure area
Domain is separated by wall and access road and total pressure region, and this side of the tail end of static pressure field is to be open and connect with wind and smoke road
It is logical；The height of access road, total pressure region and static pressure field is identical as the height in wind and smoke road.Since fluid is deposited along duct flows
In Involving velocity, it will lead to the pressure value at this and be lower than the static pressure of fluid flow region, thus realize the amplification of measurement pressure difference,
Reduce measurement error.
Connect the front end top that total pressure region and static pressure field are arranged in there are two test tube is pressed on the pressure difference transmitter
Middle face, and stable pressure difference is exported to DCS system and is converted by pressure difference transmitter.
Total pressure numerical value obtained by above-mentioned measurement and the difference of static pressure field gained static pressure and fluid mean flow rate square are directlyed proportional
Example relationship determines conversion coefficient, finally shows on the computer of DCS system by the way that the pressure difference is demarcated and converted
Show the fluid flow of measurement, to realize the accurate measurement of power station wind and smoke road flow.
Preferably, length of the total pressure region along wind and smoke flow direction is shorter than the length of access road, and total pressure region
Front end be provided with Delta Region, the Delta Region close without flowing.Caused by preventing due to the mutation there are flow area
Wind and smoke road fluid directly hits the wall of measuring device, to reduce the influence and reduction to access road import section flow field
The pressure loss.
Preferably, the connected region length and access road in the access road and total pressure region is of same size, to protect
The flow area of card measuring device internal flow remains unchanged.
Preferably, due to generally existing flying dust in thermal power plant's large size wind and smoke road, the tail end bottom of the access road and complete
The front bottom end of intermediate pressure section is provided with ash-hole so that dust stratification is discharged with fluid along ash-hole, prevent because of inlet conduits and
Measurement result is distorted caused by occurring dust stratification inside total pressure region.
Preferably, the height of the ash-hole is 30mm.Since ash-hole relative measurement device is smaller, inside is pressed
The distribution of power influences very little.
Preferably, described two pressure test tubes are band tubing, and cost is relatively low.
The utility model has the advantages that a kind of power station wind and smoke road provided by the invention flow measurement device, compared with the existing technology, have with
Lower advantage: 1, structure is simple, lower production costs, easy to operate and reliable operation；2, it can be measured in the flow field of disorder steady
Fixed pressure difference, while the amplification of pressure difference signal is realized, measurement error is reduced, so that wind and smoke road flow be greatly improved
The stability and accuracy of measuring system ensure that the safety and economy of generating set operation, energy saving.
Detailed description of the invention
Fig. 1 is a kind of main view of power station wind and smoke of the invention road flow measurement device；
Fig. 2 is a kind of top view of power station wind and smoke of the invention road flow measurement device；
Fig. 3 is a kind of side view of power station wind and smoke of the invention road flow measurement device；
Fig. 4 is a kind of perspective view of power station wind and smoke of the invention road flow measurement device；
Fig. 5 is grinding into the relational graph that mouth shows air quantity to resistance and dial plate between mouth is grinding into for certain power plant's hot wind main pipe；
It include: 1, wind and smoke road in figure, 2, access road, 3, total pressure region, 4, static pressure field, 5, ash-hole, 6, pressure test tube,
7, Delta Region, 8, connected region, 9, baffle, 10, wall, the length of A, connected region, the width of B, access road.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawings and embodiments.
Embodiment 1:
As shown in Figure 1,2,3, 4 be a kind of power station wind and smoke road flow measurement device, including access road 2, total pressure region 3,
Static pressure field 4, pressure difference transmitter and DCS system, and the device is set in wind and smoke road 1；
Wherein, the access road 2 and total pressure region 3 are the rectangular channel arranged vertically along wind and smoke flow direction, and two
Person fits along the direction perpendicular to wind and smoke flowing；Access road 2 is to be open towards the side of wind and smoke direction of flow, the other side
It is at the same level for tail end and with the tail end in total pressure region 3；It is separated between access road 2 and total pressure region 3 by baffle 9, and
There are one section of connected regions 8 at the tail end of access road 2；
The static pressure field 4 is a rectangular channel, and is set on the outside of access road 2 and the tail end in total pressure region 3；Static pressure
Region 4 is separated with access road 2 and total pressure region 3 by wall 10, and the tail end side of static pressure field 4 be open and and wind
Flue 1 is connected to；The height of access road 2, total pressure region 3 and static pressure field 4 is identical as the height in wind and smoke road 1；
Connect on the pressure difference transmitter there are two press test tube 6, be band tubing and be arranged in total pressure region 3 and
In the middle part of the front end top surface of static pressure field 4；The pressure difference that two are pressed between test tube 6 is exported to DCS system and is carried out by pressure difference transmitter
Conversion.
In the present embodiment, length of the access road 2 along wind and smoke flow direction is 500mm, width 30mm；Total pressure region 3
Length along wind and smoke flow direction is 300mm, width 30mm；Length of the static pressure field 4 along wind and smoke flow direction is 50mm, width
Degree is 60mm.
In order to reduce crushing, the wall that fluid orthogonal hits measuring device, the front end and total pressure region of access road 2 are reduced
3 front end is connected on the outside by inclined plate, constitutes Delta Region 7 of the closing without flowing；The length of Delta Region 7 is 200mm, wide
Degree is 30mm.
As shown in Fig. 2, A indicates 8 length of connected region in access road 2 and total pressure region 3 in figure, B indicates access road 2
Width, and A=B=30mm.
In the present embodiment, the tail end bottom of the access road 2 and the front bottom end in total pressure region 3 are provided with ash-hole
5, the height of the ash-hole 5 is 30mm.
According to square pass in direct ratio of the difference of static pressure obtained by gained total pressure numerical value and static pressure field and fluid mean flow rate
System determines conversion coefficient, finally in DCS system by pressing the pressure difference between test tube 6 to be demarcated and converted to two
The fluid flow of measurement is shown on computer, to realize the accurate measurement of power station wind and smoke road flow.
Comparative example 1:
Multi point measuring apparatus is used to carry out the measurement of the hot and cold First air mixed air volume of coal pulverizer inlet before certain power plant, but
Since there are vertical direction toward impact effects for hot and cold First air, lead to interior flow field extremely disorder, therefore cannot achieve accurate air quantity and survey
Amount, so as to cause being difficult to realize to the automatic control of coal, influence boiler stablizes burning and reduction efficiency of combustion.
(as described in above-mentioned comparative example 1) is not allowed in certain power plant coal entrance primary air measuring, using above-described embodiment 1
After measuring system, the stability and accuracy of air measuring are increased substantially.In order to examine correctional effect, it is primary to carry out heat
The test of air door air quantity characteristic: keeping that cold main air intake aperture is constant and coal-supplying amount is constant, and heat primary air door takes 8 apertures, point
Not Wei 100%, 90%, 80%, 70%, 60%, 55%, 50%, 45%, and record heat primary air main pipe to coal pulverizer inlet it
Between resistance and dial plate be grinding into mouth show air quantity.According to Hydrodynamics Theory, should be between above-mentioned resistance and actual air volume
Preferable linear relationship, due to can with the above-mentioned resistance of precise measurement (heat primary air main pipe static pressure and grind input static pressure difference, static pressure
Measurement is not influenced by flowing field stability), therefore the linearity deviation between above-mentioned resistance and display air quantity is able to reflect air quantity survey
The precision of amount system itself
According to above-mentioned principle, heat primary air door under 8 apertures (100%~45%) heat primary air main pipe to coal pulverizer
Resistance between entrance is grinding into the relationship between mouth display air quantity as shown in figure 5, the straight line being fitted by 8 operating points with dial plate
Are as follows: y=-0.0241x+108.37.Wherein, x is hot wind main pipe to being grinding into a mouthful crushing, unit Pa；Y is that dial plate is grinding into mouth display wind
Amount, unit t/h.
| Heat primary air door aperture | % | 100 | 90 | 80 | 70 | 60 | 55 | 50 | 45 |
| Hot wind main pipe is to being grinding into a mouthful crushing | Pa | 399 | 412 | 427 | 489 | 629 | 737 | 869 | 1043 |
| Dial plate is grinding into mouth and shows air quantity | t/h | 98.86 | 98.67 | 98.06 | 96.85 | 92.89 | 90.30 | 87.11 | 83.78 |
| Dial plate is grinding into mouth fitting air quantity | t/h | 98.75 | 98.45 | 98.09 | 96.59 | 93.21 | 90.60 | 87.42 | 83.23 |
| Air measuring system precision | % | 0.11 | 0.23 | -0.03 | 0.28 | -0.35 | -0.32 | -0.36 | 0.65 |
By upper table analysis it is found that precision to the deviation that power station wind and smoke road Flow Measuring System can be improved in the present invention is less than
± 1%.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of power station wind and smoke road flow measurement device, which is characterized in that including access road (2), total pressure region (3), static pressure
Region (4), pressure difference transmitter and DCS system, and the device is set in wind and smoke road (1)；
Wherein, the access road (2) and total pressure region (3) are the rectangular channel arranged vertically along wind and smoke flow direction, and two
Person fits along the direction perpendicular to wind and smoke flowing；Access road (2) is to be open towards the side of wind and smoke direction of flow, another
Side is tail end and is at the same level with the tail end of total pressure region (3)；Pass through baffle (9) point between access road (2) and total pressure region (3)
It separates, and there are one section of connected regions (8) at the tail end of access road (2)；
The static pressure field (4) is a rectangular channel, and is set on the outside of access road (2) and the tail end of total pressure region (3)；It is quiet
Intermediate pressure section (4) is separated by wall (10) with access road (2) and total pressure region (3), and the tail end of static pressure field (4) is to open
Mouthful；The height of access road (2), total pressure region (3) and static pressure field (4) is identical as the height of wind and smoke road (1)；
Connect on the pressure difference transmitter there are two test tube (6) are pressed, is arranged in total pressure region (3) and static pressure field (4)
In the middle part of the top surface of front end, and stable pressure difference is exported to DCS system and is converted by pressure difference transmitter.
2. a kind of power station wind and smoke road according to claim 1 flow measurement device, which is characterized in that the total pressure region
(3) length along wind and smoke flow direction is shorter than the length of access road (2), and the front end outer side of total pressure region (3) is provided with three
Angular zone (7), the Delta Region (7) are closed without flowing.
3. a kind of power station wind and smoke road according to claim 1 flow measurement device, which is characterized in that the connected region
(8) along wind and smoke flow direction length and access road (2) it is of same size.
4. a kind of power station wind and smoke road according to claim 1 flow measurement device, which is characterized in that the access road
(2) front bottom end of tail end bottom and total pressure region (3) is provided with ash-hole (5).
5. a kind of power station wind and smoke road according to claim 4 flow measurement device, which is characterized in that the ash-hole (5)
Height be 30mm.
6. a kind of power station wind and smoke road according to claim 1 flow measurement device, which is characterized in that described two pressure test tubes
It (6) is band tubing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611022234.1A CN106525172B (en) | 2016-11-16 | 2016-11-16 | A kind of power station wind and smoke road flow measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611022234.1A CN106525172B (en) | 2016-11-16 | 2016-11-16 | A kind of power station wind and smoke road flow measurement device |
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| Publication Number | Publication Date |
|---|---|
| CN106525172A CN106525172A (en) | 2017-03-22 |
| CN106525172B true CN106525172B (en) | 2019-04-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7597009B1 (en) * | 2008-07-23 | 2009-10-06 | Venturedyne, Ltd. | Airflow sensor apparatus |
| CN202126281U (en) * | 2011-06-02 | 2012-01-25 | 福建省电力有限公司电力科学研究院 | Anti-clogging pressure equalizing air flow measuring device |
| CN203241088U (en) * | 2013-05-24 | 2013-10-16 | 广东大唐国际潮州发电有限责任公司 | Flow measuring device in air flue |
| CN204832238U (en) * | 2015-08-14 | 2015-12-02 | 南京益彩环境工程配套有限公司 | Integration air speed measuring device |
| CN204854835U (en) * | 2015-08-07 | 2015-12-09 | 南京益彩环境工程配套有限公司 | A flue gas velocity flow measuring device for under abominable operating mode |
-
2016
- 2016-11-16 CN CN201611022234.1A patent/CN106525172B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7597009B1 (en) * | 2008-07-23 | 2009-10-06 | Venturedyne, Ltd. | Airflow sensor apparatus |
| CN202126281U (en) * | 2011-06-02 | 2012-01-25 | 福建省电力有限公司电力科学研究院 | Anti-clogging pressure equalizing air flow measuring device |
| CN203241088U (en) * | 2013-05-24 | 2013-10-16 | 广东大唐国际潮州发电有限责任公司 | Flow measuring device in air flue |
| CN204854835U (en) * | 2015-08-07 | 2015-12-09 | 南京益彩环境工程配套有限公司 | A flue gas velocity flow measuring device for under abominable operating mode |
| CN204832238U (en) * | 2015-08-14 | 2015-12-02 | 南京益彩环境工程配套有限公司 | Integration air speed measuring device |
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| Publication number | Publication date |
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| CN106525172A (en) | 2017-03-22 |
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