CN105444833B - A kind of equal pressure chamber, its installation method and the section formula gas flow surveying instrument comprising it - Google Patents
A kind of equal pressure chamber, its installation method and the section formula gas flow surveying instrument comprising it Download PDFInfo
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- CN105444833B CN105444833B CN201510977227.6A CN201510977227A CN105444833B CN 105444833 B CN105444833 B CN 105444833B CN 201510977227 A CN201510977227 A CN 201510977227A CN 105444833 B CN105444833 B CN 105444833B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
- G01F15/04—Compensating or correcting for variations in pressure, density or temperature of gases to be measured
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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
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
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Abstract
The invention discloses a kind of equal pressure chamber, its installation method and the section formula gas flow surveying instruments of three dimensions multiple spot pressure comprising it.A kind of equal pressure chamber is isosceles triangle thin wall cavity structure, and two waist edges of isosceles triangle are continuously disposed with more than one pressure tappings, and all pressure tappings are connected to thin wall cavity.Using the section formula gas flow surveying instrument of three dimensions multiple spot pressure of the present invention, multiple pressure points are arranged in three dimensions difference streamlined position, by the pressure section that pressure section can be designed considerably beyond existing any type measuring technique, it is especially suitable for the occasion of big pipeline gas velocity flow profile unevenness；In addition, due to the special thin wall cavity structure of equal pressure chamber, it is not easy dust stratification, and further uses the design of deashing needle, has minimized fouling potential；The gas flow surveying instrument of the present invention has anti-blocking, abrasionproof, high temperature resistant, high certainty of measurement, measures the significant advantages such as value stabilization.
Description
Technical field
The present invention relates to a kind of equal pressure chamber, its installation method and the section formula gases of three dimensions multiple spot pressure comprising it
Flow measurement device belongs to gas flow measurement technical field.
Background technology
In modern enterprise production, boiler all needs to be sent into a large amount of wind, while a large amount of flue gas of output per hour.With me
State's economic system reform deeply, the subdivision of business accounting unit, carry out cost accounting and management, fully reduce energy consumption and have become hair
Exhibition trend, and the measurement of big pipeline dusty gas flow, meaning seem more and more great, also more and more by people it is of interest with
Pay attention to.
Industrial processes, temperature, pressure, flow, four big thermal parameter of liquid level measurement in, flow measurement will reach
Expected accuracy and reliability, ICS Engineer generally believe that difficulty maximum, especially big pipeline air quantity, flue gas flow are surveyed
Amount, it is more aobvious intractable, it traces it to its cause：First being measured fluid generally has the characteristics that temperature is high, dustiness is big, corrosivity is strong；Two
Then the pipeline section product of trandfer fluid is big, straight pipe is short, elbow is more, and changes in flow rate range is big, static pressure is small, flow velocity is low.Therefore,
Big pipeline air quantity, flue gas flow are accurately measured, should rationally design, select flow instrument, it is correct again to install, use flow
Instrument, only comprehensive management and control just can guarantee the accurate and reliable of measured value.
By taking thermal power plant as an example, the present situation that big pipeline air quantity, flue gas flow measure at present is further illustrated.
Station boiler primary and secondary air Boiler pressure control is directly related to Boiler Stable Combustion, economical operation, slagging prevention, drop
The serial important indicator such as low stain object discharge is thermal power plant's safety, economic, environmental protection operation working contents.First air, two
Secondary wind is preheated through rotary regenerative air preheater, not only absorbs amount of heat in flue gas, but also carry largely by heat exchange element
Soot particle has the characteristics that high temperature, dust-laden, and sizable challenge is brought to the work of apparatus for measuring air quantity long time stability.In addition,
The smoke evacuation measurement of station boiler is also particularly important, in SCR techniques, it is necessary to calculate ammonia spraying amount according to real-time flue gas flow；
Chimney entrance needs, it is also necessary to accurately measure amount of flue gas emission for environment monitoring；It is flat that flue gas flow measurement is also directly related to heat
The accuracy that weighing apparatus calculates, efficiency of combustion is evaluated.Flue gas not only has higher temperature and higher compared with First air, Secondary Air
Dust-laden, and also have the characteristics that humidity is big, corrosivity is strong in boiler back end ductwork, therefore the measurement difficulty of exhaust gas volumn can be more
Greatly.
The characteristics of station boiler First air, Secondary Air and flue gas, is easy to after determining apparatus for measuring air quantity long-time use
Abrasion and blocking, wherein again particularly troublesome with blockage problem.Conventional differential pressure type flow meter total head mouth and static port is inserted
Enter in air-flow, the dust carried in air-flow is flowed due to being hit with measuring device, with air-flow and the effect of frictional static, is easy viscous
Knot is in pressure tappings and its connecting pipe.When gas temperature is less than acid dew point and water dew point, the viscosity of dust significantly increases, and leads
Dust agglomerations in measuring device are caused, the blockage problem of measuring device is more exacerbated.This blocking is happened at apparatus for measuring air quantity
Inside can only be solved with the method for compressed air timing purging, prodigious maintenance workload is brought to thermal technology's profession.
Thermal power plant air and flue system pipeline section product is big, and arrangement baffle adjusts the components such as door, supporting rod in pipeline, by cloth
It being limited between emptying, general straight pipe is shorter and elbow is more, causes pipeline flow field more disorderly, flow section VELOCITY DISTRIBUTION,
Temperature Distribution is seriously uneven, and the average dynamic pressure value that single-point or a few point measure cannot represent the total blast volume of entire flow section
Or the variation of total exhaust gas volumn.
In addition, existing air quantity or flue gas flow measuring device crushing are also larger, it is very uneconomical applied to thermal power plant,
As Venturi tube, airfoil type flowmeter increase the pressure difference signal of flow measurement device by the way of throttling to pipeline, but simultaneously
Air-flow flow resistance is increased, and then station service power consumption rate is caused to increase.
Invention content
The present invention provides a kind of equal pressure chamber, its installation method and the section formula gas of the three dimensions multiple spot pressure comprising it
Flow measurement device, to improve the stability and accuracy that air quantity and flue gas flow measure in industrial processes.
In order to solve the above technical problems, the technical solution adopted in the present invention is as follows：
A kind of equal pressure chamber, is isosceles triangle thin wall cavity structure, and equal pressure chamber is equipped with 6~60 pressure tappings, pressure tappings
It is symmetrically distributed in two waist edges of isosceles triangle, and all pressure tappings are connected to thin wall cavity；The apex angle of isosceles triangle
It it is 90~150 °, corresponding two base angles are 15~45 °.
Above-mentioned equal pressure chamber is suitable for the measurement of various pipeline flows, includes the measurement of big pipeline air quantity, flue gas flow, in utilization
When stating equal pressure chamber pressure, air-flow is met at the vertex position of isosceles triangle.
Above-mentioned equal pressure chamber can provide stable average total head and average static pressure, measure the stream corresponding to isosceles triangle bottom edge
The average flow rate in dynamic section, to represent the total flow of entire flow section.It should be noted that above-mentioned pressure section is approximately equal to
The flow section that triangle base is covered, i.e. equal pressure chamber fluoran stream surface almost both provide flow measurement signal, with traditional air quantity
Measuring device is compared, and pressure area is much greater, therefore can provide more stable and accurate flow signal.
Stable total head and static pressure are formed in order to ensure, it is preferable that do not retain the apex angle sharp parts of isosceles triangle, isosceles
The bottom edge of triangle is equipped with extension section, partition board is equipped between extension section and the bottom of isosceles triangle, the end for the section that extends is spacious
The end of mouth structure, the section that extends refers to one end far from isoceles triangle apex angle.
Aforementioned barriers are completely separated by extension section and isosceles triangle section.
The above-mentioned apex angle sharp parts for not retaining isosceles triangle may be the shapes such as isosceles trapezoid.Extension section by
Isosceles triangle bottom edge extends gained, when the apex angle sharp parts for not retaining isosceles triangle and has extension section, then
Pressure chamber is the thin wall cavity structure of isosceles trapezoid and rectangle laminated structure, and by partition board that extension section and isosceles triangle section is complete
It separates entirely.
It should be noted that the above-mentioned practical static pressure of static pressure ratio fluid measured in equal pressure chamber extension section is lower, mainly
Since the flowing of peripheral fluid forms swabbing action, extension section is caused to be formed opposite " vacuum area ", peripheral fluid flow velocity is higher, " true
Reciprocal of duty cycle " is bigger.Above-mentioned swabbing action is formed by differential pressure and is formed by the differential pressure signal after dynamic pressure is superimposed with flowing stagnation, meets
Bernoulli equation principle can really reflect the size of actual flow.Just because of this, utilizes the flow of equal pressure chamber pressure of the present invention
The surveyed dynamic pressure signal of measuring device is larger than theoretical dynamic pressure signal, has pressure difference signal amplification, this is beneficial to wind
The accurate and reliable measurement of amount.
In order to improve the accuracy of measurement, pressure tappings are symmetrically distributed in two waist edges of isosceles triangle.
Above-mentioned equal pressure chamber preferably uses stainless sheet steel to make, and for the ease of preparing, while ensureing the accuracy of pressure, excellent
Choosing, equal pressure chamber, including two blocks of isosceles triangle side plates and one piece or more meet stream partition board, two blocks of isosceles triangle side plates it is parallel and
It is oppositely arranged；One piece or more of stream partition board of meeting is located between two blocks of isosceles triangle side plates and by two blocks of isosceles triangle side plates
It is linked together, two waist edges of isosceles triangle are divided into two parts or more by one piece or more of stream partition board of meeting, and a pressure is formed per a
Mouthful.
In order to improve the stability of measurement, stream partition board and isosceles triangle side plate vertical connection are met, stream septum plane is met and meets
Air-flow and, pressure tappings rectangular cross-section parallel with the bottom edge of isosceles triangle side plate.
In order to further ensure the accuracy of measurement, it is preferable that the spacing of two blocks of isosceles triangle side plates is 30~80mm.And
With a line approximately equal for meeting stream partition board.
In order to further decrease in equal pressure chamber and the possibility of pressure tappings dust stratification, in equal pressure chamber suspention have one or more deashing
Pressure tappings are stretched out at needle, deashing needle both ends.
Above-mentioned deashing needle can utilize the kinetic energy for measuring fluid to realize automatic ash removing.
Since pressure tappings are continuously arranged, it is preferable that arrange that a deashing needle, one group of pressure tappings refer to isosceles every one group of pressure tappings
Two symmetrical pressure tappings are stretched out at two symmetrical pressure tappings of two waist edge of triangle, deashing needle both ends.
It can guarantee that deashing needle can beat every piece and meet stream partition board in this way, and then ensure that pressure tappings do not block, beat caused
Vibration all play the role of apparent deashing to entire equal pressure chamber.
In order to reduce the abrasion of equal pressure chamber under high temperature, dust atmosphere, in the outer surface of equal pressure chamber and fluoran stream surface spraying abrasion-proof
Material.
Stream partition board is met directly by airflow scouring due to above-mentioned, is the component that the present invention is most easily worn, as reduction
Another preferred embodiment of abrasion is met stream partition board and is made of wear-resistant material, such as high temperature alloy or potsherd.
The installation method of above-mentioned equal pressure chamber arranges one or more equal pressure chamber in pipeline, when arrangement two with
When upper, the average total head pressure regional peace equal static pressure pressure region of each equal pressure chamber is respectively connected to communicating pipe, and respectively
Pick out an at least overall average total head pressure guiding pipe and an overall average static pressure pressure guiding pipe.
Total head is that (average total head pressure region) measures in isosceles triangle thin wall cavity, and static pressure is in isoceles triangle
Shape thin wall cavity outer (average static pressure pressure region) measures, and specific location is exactly thin wall cavity back (namely isosceles triangle bottom
Part outside portion's thin wall cavity), when equipped with extension section, average static pressure pressure region position preferably among extension section.
Dust stratification in order to prevent, any section of communicating pipe and the angle of horizontal plane are both less than 30 °.
The nozzle of calming the anger that throttles is provided in order to ensure the voltage equalizing of multiple equal pressure chambers, in communicating pipe.
Above-mentioned throttling is calmed the anger the main function of nozzle：It prevents due to leading to communicating pipe there are apparent pressure difference between each equal pressure chamber
Interior gas flow rate is higher, in turn results in that differential pressure between above-mentioned overall average total head and overall average static pressure is unstable or distortion.It is above-mentioned
Throttling is calmed the anger, and nozzle is practical to play throttle orifice, and single throttle hole area (minimum cross-section for referring to air nozzle in Figure 13) is less than connection
The principle of the 30% of cross-sectional area in pipe, installation site and design structure is to avoid dust stratification in communicating pipe, specific constructive form
It is not construed as limiting.
Above-mentioned equal pressure chamber is installed in circular pipe or rectangular duct；When being installed in circular pipe, preferably one is pressed
Room is inserted perpendicularly into pipeline and passes through center location；When being installed on rectangular duct, preferably more than two equal pressure chambers are inserted perpendicularly into pipe
In road, and it is spaced uniform.Namely when it is mixing to be installed in circular pipe, equal pressure chamber is preferably one, when being installed on rectangle
When pipeline, equal pressure chamber is preferably two or more.
In order to ensure the stability and accuracy of flow measurements, the length of equal pressure chamber should be close to circular pipe internal diameter or square
Shape pipeline direction of insertion is to edge lengths.
When being installed in the gaseous environment containing dust, to prevent bottom dust stratification, it is preferable that the length of equal pressure chamber is less than round tube
Road 50~200mm of internal diameter or less than rectangular duct direction of insertion to 50~200mm of edge lengths, equal pressure chamber length refers to isoceles triangle
The length on shape bottom edge.
When installation, the easy dust stratification area in fluid in equal pressure chamber bottom should be made unobstructed.Rectangular duct direction of insertion is to edge lengths
Refer to equal pressure chamber length direction both ends to rectangular duct two side between spacing.
Above-mentioned average total head and the difference of average static pressure are average dynamic pressure, and from technical principle, above-mentioned equal pressure chamber is taken
Differential pressure signal can represent it and meet the size of flow section flow completely, even if velocity flow profile is seriously uneven along its length, shadow
Sound will not be too big.Therefore, to obtain accurate total cross-section flow, preferably equal pressure chamber length direction and change in flow gradient is larger
Direction it is consistent.Preferably make equal pressure chamber length direction and baffle when upstream, which is equipped with baffle, adjusts door according to above-mentioned optimum principle
Pivot center is vertical；When upstream is equipped with 90 ° of elbows, preferably make equal pressure chamber length direction horizontal with elbow upstream line.When upper
When stating optimum principle and mutually conflicting with aforementioned optimum principle, installation method should be determined by aforementioned optimum principle, and take other measures
Ensure measurement accuracy, such as increases deflector.
Include the section formula gas flow surveying instrument of the three dimensions multiple spot pressure of above-mentioned equal pressure chamber, including dynamic pressure measurement
Unit, static pressure measurement unit, temperature measurement unit and flow rate calculation display module；
Dynamic pressure measurement unit includes equal pressure chamber, total head pressure pipe, static pressure pressure pipe and pressure difference transmitter, and total head pressure pipe is stretched
It is connected to equal pressure chamber isosceles triangle bottom edge midpoint position with the thin wall cavity of equal pressure chamber, measures average total head, static pressure pressure pipe
It extends to position among equal pressure chamber isosceles triangle bottom edge to be connected to thin wall cavity back, measures average static pressure；Total head pressure pipe and
Static pressure pressure pipe is connect with pressure difference transmitter；
Pressure difference transmitter, static pressure measurement unit and temperature measurement unit are respectively connect with flow rate calculation display module.
Above-mentioned average total head and the difference of average static pressure are average dynamic pressure, are converted to electric signal through pressure difference transmitter, transmit
To flow rate calculation display module, the static pressure electric signal provided in conjunction with static pressure measurement unit and temperature measurement unit and temperature telecommunications
Number, surveyed gas flow is calculated in real time, it is specific to calculate with reference to the prior art.
The section formula gas flow surveying instrument of three dimensions multiple spot pressure of the present invention is in use, be inserted into corresponding pipe
In road, it is mainly equal pressure chamber to be inserted into pipeline and generate the component of resistance, and fluoran stream surface almost provides flow measurement signal,
And traditional flow measurement device (such as multipoint mode apparatus for measuring air quantity, wing wind measuring device) cannot achieve this point and
Gap is apparent, therefore the present invention is to obtain flow measurement signal the most reliable with minimum cost, and power savings advantages are particularly
Obviously.
When the flow measurement device of the present invention is in non-dusting gaseous environment, installation site is unrestricted；But it is in
In gaseous environment containing dust, in order to avoid dust stratification, installation site should be selected in horizontal pipe or be not more than with the angle of horizontal plane
On 60 ° of tilted tube.When being but unsatisfactory for above-mentioned condition in the gaseous environment containing dust, such as measuring device of the present invention is pacified
Ensure that not dust stratification, such as increasing match compressed air timing purge system loaded on additional technical measures in vertical pipeline, must be taken.
Connect with thin wall cavity back it is preferred that static pressure pressure pipe extends to position among equal pressure chamber isosceles triangle bottom edge extension section
It is logical.
The structure and arrangement of above-mentioned equal pressure chamber are core of the invention contents, and other composition measuring devices are essential
Component part refer to the prior art.
The unmentioned technology of the present invention is with reference to the prior art.
Using the section formula gas flow surveying instrument of three dimensions multiple spot pressure of the present invention, in three dimensions difference streamline
The multiple pressure points of location arrangements, since pressure section is cut considerably beyond the pressure that existing any type measuring technique can design
Face, therefore it is especially suitable for the occasion of big pipeline gas velocity flow profile unevenness；In addition, due to the special thin wall cavity knot of equal pressure chamber
Structure is not easy dust stratification, and further uses the design of deashing needle, has minimized fouling potential；The gas flow of the present invention
Measuring device has anti-blocking, abrasionproof, high temperature resistant, high certainty of measurement, measures the significant advantages such as value stabilization.
Description of the drawings
Fig. 1 is the basic principle of air flow rate measuring device of the present invention.
Fig. 2 is the sectional view of gas flow surveying instrument equal pressure chamber of the present invention.
Fig. 3 is view of the gas flow surveying instrument equal pressure chamber of the present invention along airflow direction.
Fig. 4 is arrangement schematic diagram of the equal pressure chamber in cold primary air piping in embodiment 1.
Fig. 5 is Section A-A schematic diagram (being rotated by 90 ° counterclockwise) in Fig. 4.
Fig. 6 is arrangement schematic diagram of the equal pressure chamber in heat primary air pipe in embodiment 2.
Fig. 7 is section B-B schematic diagram in Fig. 6.
Fig. 8 is arrangement schematic diagram of the equal pressure chamber in hot secondary air channel in embodiment 3.
Fig. 9 is C-C schematic cross-sections in Fig. 8.
Figure 10 is the equal pressure chamber arrangement schematic diagram in SCR reactor inlets and outlet conduit respectively in embodiment 4.
Figure 11 is the structural representation after the equal pressure chamber optimization being arranged in embodiment 4 in SCR reactor inlet vertical pipes
Figure.
Figure 12 is D-D schematic cross-sections in Figure 10.
Figure 13 is that the throttling that is installed in pressure pipe is calmed the anger the front view of nozzle in embodiment 4.
Figure 14 is the vertical view of Figure 13；
Figure 15 is arrangement schematic diagram of the equal pressure chamber in chimney inlet duct in embodiment 5.
Figure 16 is E-E schematic cross-sections in Figure 15.
In figure, 1 is isosceles triangle side plate, and 2 is meet stream partition board, and 3 be deashing needle, and 10 be equal pressure chamber, and 11 be extension section, 12
It is average static pressure pressure region for average total head pressure region, 13,14 be pressure guiding pipe, and 15 be total head pressure pipe, and 16 take for static pressure
Pressure pipe, 17 be the nozzle of calming the anger that throttles, and 21 be cold First air pitch, and 22 be heat primary air pitch, and 23 is curved logical for 90 ° of hot Secondary Air,
24 be SCR reactors, and 25 be baffle assembly, and 26 be chimney, and 31 flow to for cold First air, and 32 flow to for heat primary air, and 33 are
Hot Secondary Air flow direction, 34 be denitration import flue gas flow direction, and 35 flow to for denitration exiting flue gas, and 36 flow to for neat stress.
Specific implementation mode
For a better understanding of the present invention, with reference to the embodiment content that the present invention is furture elucidated, but the present invention
Content is not limited solely to the following examples.
Embodiment 1
300MW coal units use unit pulverized-coal system, match 6 medium-speed pulverizers, every coal pulverizer inlet using it is cold,
The mode of heat primary air mixing adjusts disintegrating outlet temperature.Above-mentioned cold a wind pipe from top to bottom vertically accesses heat primary air pipe
Road leads to installation formula gas flow surveying instrument in section of the present invention on the straight pipe between cold First air pitch in quarter bend.It is complete
Whole measuring device includes dynamic pressure measurement unit, static pressure measurement unit, temperature measurement unit and flow rate calculation display module, is such as schemed
Shown in 1.Dynamic pressure measurement unit is made of equal pressure chamber, total head pressure pipe, static pressure pressure pipe and pressure difference transmitter, and the equal pressure chamber is in
Air-flow is met at the vertex position of isosceles triangle thin wall cavity structure, isosceles triangle, and two waist edges continuously arrange multiple pressure tappings, and
It is connected to thin wall cavity, total head pressure pipe extends to isosceles triangle bottom edge midpoint position by pressure tappings and connects with thin wall cavity
It is logical, average total head is measured, static pressure pressure pipe extends to position and thin-walled sky among isosceles triangle bottom edge extension section by pressure tappings
Chamber back is connected to, and measures average static pressure, as shown in Figure 2,3.Above-mentioned average total head and the difference of average static pressure are average dynamic pressure, warp
Pressure difference transmitter is converted to 4-20mA electric signals, is transmitted to flow rate calculation display module in DCS system, in conjunction with static pressure measurement unit
The static pressure electric signal and temperature signal provided with temperature measurement unit calculates survey cold primary air flow in real time.
Above-mentioned equal pressure chamber is made of 304 stainless steel plates of 2mm thickness, is in isosceles triangle shape, and apex angle is 120 °, two base angles
It it is 30 °, two pieces of isosceles triangle side sheet rooms are away from for 30mm；The apex angle sharp parts of equal pressure chamber isosceles triangle, isosceles are not retained
The bottom edge of triangle is equipped with extension section, is equipped between two blocks of isosceles triangle side plates and meets stream partition board and form pressure on two waists
Mouthful, pressure tappings longitudinal section is rectangle.Above-mentioned cold a wind pipe section is circle, internal diameter 500mm.
Since, substantially without dust, there is no need to consider dust stratification problem in cold First air.Above-mentioned equal pressure chamber length with it is cold primary
Wind pipeline internal diameter is substantially suitable, is inserted perpendicularly into pipeline and by center location, diametrically continuously arranges 8 pressure tappings,
Pressure tappings are symmetrically distributed on the both sides of isosceles triangle two-by-two.
Since equal pressure chamber upstream is there are a quarter bend is logical, the maximum direction of change in flow gradient should substantially with curved logical upstream
Pipeline is parallel, therefore, for the flow signal for obtaining representative, ensures that equal pressure chamber length direction is flat with curved logical upstream line
Row.
To improve the measurement accuracy of formula apparatus for measuring air quantity in section of the present invention, must not only be carried out in laboratory standard wind-tunnel
Flow calibration, but also Wind Coverage Calculation model should be modified in conjunction with the result of live flow calibration.
Embodiment 2
300MW coal units use unit pulverized-coal system, match 6 medium-speed pulverizers, every coal pulverizer inlet using it is cold,
The mode of heat primary air mixing adjusts disintegrating outlet temperature.Above-mentioned heat primary air pipe is horizontally disposed, since site space limits, only exists
Heat primary air pitch downstream can install formula apparatus for measuring air quantity in section of the present invention, as shown in Figure 6.
The structure of equal pressure chamber is similar to Example 1 in the present embodiment, different sizes and mounting means.It is hot primary
The rectangular cross-section of wind pipeline, width 900mm are highly 1200mm.Above-mentioned equal pressure chamber length is 1000mm or so, along height
Direction is inserted perpendicularly into heat primary air pipeline, and single equal pressure chamber from top to bottom totally 16 pressure tappings are symmetrically distributed in isosceles three two-by-two
On angular both sides；3 equal pressure chambers, spacing 300mm are arranged along heat primary air duct width direction.Above-mentioned measurement section is total to cloth
Set 48 pressure tappings, the stability and accuracy of common guarantee measuring signal, as shown in Figure 7.
Since heat primary air carries a small amount of dust from rotary regenerative air preheater, it is therefore desirable to consider dust to surveying
Measure the influence of device.When installation, the space of 100mm or so is reserved between equal pressure chamber bottom and heat primary air road bottom surface, ensures wind
Road lower flow is unobstructed, you can formula apparatus for measuring air quantity in section of the present invention is avoided to block.
Due to the influence of heat primary air pitch, on heat primary air road flow section, velocity flow profile is more equal in the width direction
It is even, and it is seriously uneven along short transverse velocity flow profile.But formula apparatus for measuring air quantity in section of the present invention is several in the short transverse of air duct
Average dynamic pressure is got completely, therefore measuring signal can really reflect the size of actual air volume.In air duct width direction, arrangement
3 equal pressure chambers, and the average total head pressure region of each equal pressure chamber and each average static pressure pressure region is made to be respectively communicated to a bit, survey
Take overall average total head and overall average static pressure.Since width direction velocity flow profile is more uniform, arranges that 3 equal pressure chambers can guarantee and survey
The precision of amount.
Embodiment 3
The hot secondary air duct sectional dimension of 600MW coal units is up to 4500 × 4800mm, since sectional dimension is larger, straight tube
Section is shorter, and flow velocity is relatively low and distribution is serious uneven, and conventional air measuring technology, which is difficult to meet unit cooperative control, to be required.Using this
Section formula apparatus for measuring air quantity is invented, 4 × 2 equal pressure chambers are arranged in hot secondary air duct, as shown in Figure 8,9.It hangs down along equal pressure chamber
Straight direction of insertion arrangement is multiple, can reduce the size of single equal pressure chamber, and then reduce manufacturing cost, and convenience in transport also allows for existing
Field installation.The structure of above-mentioned single equal pressure chamber is similar to Example 2, repeats no more.
It should be added that the part of total head pressure pipe and static pressure pressure pipe in air duct is in the present embodiment
X-shaped, this structure can ensure the voltage equalizing between each equal pressure chamber.
Embodiment 4
After certain 600MW coal unit denitration transformation, spray ammonia automatic control system need to calculate ammonia spraying amount according to flue gas flow, because
This must install flue gas flow measuring device.Since site space is more compact, at alternative installation site only two：Spray ammonia
Grid is to the vertical ascent section of SCR reactor inlets and the tilting section (about 30 ° of angle with horizontal plane) of SCR reactor outlets, such as
Shown in Figure 10.
If selecting the vertical ascent section in ammonia-spraying grid to SCR reactor inlets to install formula flue gas flow in section of the present invention to survey
Device is measured, must not dust stratification in pressure pipe be ensured using optimization design.Concrete measure is：It is different from embodiment 1-3, equal pressure chamber at this
It is not provided with extension section, to avoid dust stratification at extension section, and total head pressure pipe angle with horizontal plane is made to be 45 ° or so of updip, static pressure
Pressure pipe is directly in the back pressure of total head pressure pipe, as shown in figure 11.
If the tilting section of SCR reactor outlets is selected to install formula flue gas flow measuring device in section of the present invention, equal pressure chamber
Structure is similar with embodiment 1-3.The outlets SCR size is 3000 × 12000mm, and width direction is far longer than short transverse,
Therefore up to 12 equal pressure chambers are arranged, each average total head pressure regional peace equal static pressure pressure region is connected with communicating pipe respectively
It is logical, and an overall average total head pressure guiding pipe and an overall average static pressure pressure guiding pipe are picked out respectively, as shown in figure 12.It is each in order to ensure
The voltage equalizing of equal pressure chamber installs the nozzle of calming the anger that throttles additional at communicating pipe and each pressure regional connectivity, and as shown in figure 12, throttling is equal
Calm the anger nozzle longitudinal section be bow-tie shape, cross section be circle, concrete structure is referring to Figure 13,14.
Further, since SCR is arranged in high dirt section, in order to avoid measuring device blocks, installed additional inside each equal pressure chamber
Two symmetrical pressure tappings are stretched out at more deashing needles, deashing needle both ends.
Embodiment 5
Certain 1000MW coal unit installs flue gas flow measuring device, access by the requirement of local Environmental Protection Agency, in chimney entrance
Desulfurization CEMS, as the foundation for calculating power plant's charges for disposing pollutants.The cross-sectional dimension of chimney gas approach is larger, almost without straight pipe,
Neat stress humidity after desulfurization is again larger, corrosivity is stronger.In view of above-mentioned factor, using 4mm's when equal pressure chamber makes
The spacing of two pieces of triangular side panels to slow down relatively corrosive rate, and is enlarged to 80mm, improves pressure tappings by 316L stainless steel plates
With the size of internal cavities, it is made to be not easy to plug, be separately assembled from deashing needle, ensures that flue gas flow measuring device of the present invention for a long time may be used
By steady operation, as shown in figure 16.
In addition, for the shorter measurement occasion of straight pipe, the design of perfect deflector is necessary, also body in Figure 15
It is existing.
Claims (11)
1. a kind of equal pressure chamber, it is characterised in that：For isosceles triangle thin wall cavity structure, equal pressure chamber is equipped with 6~60 pressures
Mouthful, pressure tappings are symmetrically distributed in two waist edges of isosceles triangle, and all pressure tappings are connected to thin wall cavity；Isoceles triangle
The apex angle of shape is 90~150 °, and corresponding two base angles are 15~45 °；
Equal pressure chamber includes that two blocks of isosceles triangle side plates and one piece or more meet stream partition board, two blocks of isosceles triangle side plates it is parallel and
It is oppositely arranged；One piece or more of stream partition board of meeting is located between two blocks of isosceles triangle side plates and by two blocks of isosceles triangle side plates
It is linked together, two waist edges of isosceles triangle are divided into two parts or more by one piece or more of stream partition board of meeting, and a pressure is formed per a
Mouthful.
2. equal pressure chamber as described in claim 1, it is characterised in that：Stream partition board and isosceles triangle side plate vertical connection are met, is met
Stream septum plane meets air-flow and parallel with the bottom edge of isosceles triangle side plate, and pressure tappings longitudinal section is rectangle；Two pieces of isoceles triangles
The spacing of shape side plate is 30~80mm.
3. equal pressure chamber as claimed in claim 1 or 2, it is characterised in that：Suspention has one or more deashing needle in equal pressure chamber, clearly
Pressure tappings are stretched out at grey needle both ends.
4. equal pressure chamber as claimed in claim 3, it is characterised in that：A deashing needle is arranged every one group of pressure tappings, and one group takes
Pressure mouth refers to two symmetrical pressure tappings of two waist edge of isosceles triangle, and two symmetrical pressures are stretched out at deashing needle both ends
Mouthful.
5. equal pressure chamber as claimed in claim 1 or 2, it is characterised in that：The apex angle sharp parts for not retaining isosceles triangle, etc.
The bottom edge of lumbar triangle shape is equipped with extension section, partition board is equipped between extension section and the bottom of isosceles triangle, the end for the section that extends is
The end of uncovered structure, the section that extends refers to one end far from isoceles triangle apex angle.
6. the installation method of the equal pressure chamber described in claim 1-5 any one, it is characterised in that：In pipeline arrange one or
More than two equal pressure chambers, when arranging more than two, the equal static pressure pressure of average total head pressure regional peace of each equal pressure chamber
Region is respectively connected to communicating pipe, and picks out an at least overall average total head pressure guiding pipe and an overall average static pressure impulse respectively
Pipe.
7. installation method as claimed in claim 6, it is characterised in that：Any section of communicating pipe and the angle of horizontal plane are both less than
30°。
8. installation method as claimed in claims 6 or 7, it is characterised in that：The nozzle of calming the anger that throttles is provided in communicating pipe.
9. installation method as claimed in claims 6 or 7, it is characterised in that：Equal pressure chamber is installed on circular pipe or rectangular duct
It is interior；When being installed in circular pipe, an equal pressure chamber is inserted perpendicularly into pipeline and passes through center location；When being installed on rectangular tube
Road, more than two equal pressure chambers are inserted perpendicularly into pipeline, and are spaced uniform.
10. installation method as claimed in claims 6 or 7, it is characterised in that：The length of equal pressure chamber is less than circular pipe internal diameter 50
~200mm or less than rectangular duct direction of insertion to 50~200mm of edge lengths, equal pressure chamber length refers to isosceles triangle bottom edge
Length.
11. the section formula gas flow of the three dimensions multiple spot pressure comprising the equal pressure chamber described in claim 1-5 any one
Measuring device, it is characterised in that：It is shown including dynamic pressure measurement unit, static pressure measurement unit, temperature measurement unit and flow rate calculation
Module；
Dynamic pressure measurement unit includes equal pressure chamber, total head pressure pipe, static pressure pressure pipe and pressure difference transmitter, and total head pressure pipe is by taking
Pressure mouth extends to equal pressure chamber isosceles triangle bottom edge midpoint position and is connected to the thin wall cavity of equal pressure chamber, measures average total head, static pressure
Pressure pipe extends to position among equal pressure chamber isosceles triangle bottom edge and is connected to thin wall cavity back, measures average static pressure；Total head takes
Pressure pipe and static pressure pressure pipe are connect with pressure difference transmitter；
Pressure difference transmitter, static pressure measurement unit and temperature measurement unit are respectively connect with flow rate calculation display module.
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| CN201510977227.6A CN105444833B (en) | 2015-12-22 | 2015-12-22 | A kind of equal pressure chamber, its installation method and the section formula gas flow surveying instrument comprising it |
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| CN201510977227.6A CN105444833B (en) | 2015-12-22 | 2015-12-22 | A kind of equal pressure chamber, its installation method and the section formula gas flow surveying instrument comprising it |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105953855A (en) * | 2016-06-22 | 2016-09-21 | 武金玉 | Anti-blockage differential pressure flowmeter |
| CN107389133A (en) * | 2017-08-08 | 2017-11-24 | 张晨 | Exhaust measurement, sampling apparatus and methods and applications |
| CN109505829B (en) * | 2018-11-28 | 2021-12-03 | 中国核电工程有限公司 | Passive modularized fluid resistance element |
| CN109696270B (en) * | 2018-12-27 | 2024-03-05 | 上海理工大学 | Pressure taking device, pressure measuring equipment and pressure difference measuring equipment |
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| CN105444833A (en) | 2016-03-30 |
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