CN202420572U - Multipoint cross section type air quantity measuring device - Google Patents

Multipoint cross section type air quantity measuring device Download PDF

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Publication number
CN202420572U
CN202420572U CN2011205401170U CN201120540117U CN202420572U CN 202420572 U CN202420572 U CN 202420572U CN 2011205401170 U CN2011205401170 U CN 2011205401170U CN 201120540117 U CN201120540117 U CN 201120540117U CN 202420572 U CN202420572 U CN 202420572U
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CN
China
Prior art keywords
pressure
section
air quantity
differential pressure
measuring
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2011205401170U
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Chinese (zh)
Inventor
晏远刚
封柯
余奉海
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CHONGQING WEIBA INSTRUMENT CO LTD
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CHONGQING WEIBA INSTRUMENT CO LTD
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Priority to CN2011205401170U priority Critical patent/CN202420572U/en
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Publication of CN202420572U publication Critical patent/CN202420572U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses a multipoint cross section type air quantity measuring device, which comprises a plurality of single-point measuring devices, connecting pipes and a differential pressure transmitter. Each single-point measuring device comprises a differential pressure pressure-measuring probe arranged inside a to-be-measured pipeline and including a windward section pressure-measuring opening and a leeward section pressure-measuring opening. When the air quantity measuring device is used for measurement, the single-point pressure-measuring probes are arranged on the same cross section inside the to-be-measured pipeline according to measurement requirements, each windward faces an air inlet of the pipeline, the positive pressure sides and the negative pressure sides of the single-point differential pressure pressure-measuring probes are connected together respectively through the connecting pipes, and main pressure guide pipes are led out of the positive pressure sides and the negative pressure sides respectively, extend out of the to-be-detected pipeline and are connected with the positive end and the negative end of the differential pressure transmitter respectively, so that average speed of air in the cross section is measured, and further air quantity is computed. The multipoint cross section type air quantity measuring device can ensure accuracy of long-term measurement, so that automatic operation ratio of a boiler is greatly increased, air quantity inside each air pipe can be reflected timely, and the boiler can be constantly in operation under the economical working condition.

Description

Multiple spot cross section type apparatus for measuring air quantity
Technical field
The utility model relates to a kind of multiple spot cross section type apparatus for measuring air quantity.
Background technology
The boiler combustion situation in power plant, power station affects the economy and the security of boiler plant and whole power-plant operation to a great extent.The adjustment of combustion conditions is suitable, i.e. fuel combustion fully, fire box temperature field and thermal load evenly distribute etc. is the necessary condition that guarantees boiler safety, stable, economical operation.And the accuracy of boiler air measuring directly has influence on the normal running of operations staff to boiler operating state.Along with the automaticity in power plant, power station is increasingly high, the engineering staff is also increasingly high to the stability requirement of air measuring.
All kinds of power plant in current market, station boiler apparatus for measuring air quantity mainly adopt the flowmeter of two kinds of principles: the one, and caloic formula, the 2nd, differential pressure type.Wherein differential pressure type is used the most ripely and is general, but existing various differential pressure type flow meters existence are prone to bottleneck problems such as stifled, not wear-resisting, can not fully satisfy the measurement needs.
Summary of the invention
In view of this, the purpose of the utility model provides a kind of multiple spot cross section type apparatus for measuring air quantity.The reasonable wind distribution that can help boiler can reduce the machinery and the heat loss due to unburned gas of exhaust gas temperature, reduction unburned carbon in flue dust, reduction coal dust effectively, improves boiler efficiency.
The purpose of the utility model realizes through following technical scheme:
This kind multiple spot cross section type apparatus for measuring air quantity comprises a plurality of spot measurement devices, connecting pipe and differential pressure transmitter;
Said spot measurement device comprises that being arranged on the inner differential pressure pressure of pipe under test pops one's head in; Said differential pressure pressure probe comprises windward side section pressure tappings and lee face section pressure tappings; The two ends of differential pressure pressure probe are respectively arranged with laterally zygomorphic oblique groove, and the groove face is the pressure position of windward side, during installation; A plurality of single-point pressure probes are arranged on the inner same xsect of pipe under test according to measurement requirement; Its windward side links together and mutual UNICOM through the windward side pressure tappings of connecting pipe with all differential pressure pressure probes towards the air inlet of pipeline, and the malleation side that is about to differential pressure pressure probe links together; Also link together and mutual UNICOM through the lee face pressure tappings of connecting pipe with all differential pressure pressure probes simultaneously, the suction side that is about to differential pressure pressure probe links together; The positive and negative pressure side is respectively drawn a total pressure guiding pipe, and said total pressure guiding pipe stretches out the pipe under test outside, links to each other with the positive and negative end of differential pressure transmitter respectively, thereby records the average velocity in cross section, and then calculate air quantity.
Further, the two ends of said differential pressure pressure probe are respectively arranged with the oblique groove of upper and lower symmetry, and the groove face is the pressure position of windward side;
Further, the adjacent underneath annular of said oblique groove is provided with one section ceramic wear-resisting paster;
Further, the set inside of said oblique groove has from deashing device;
Further, said is the automatic ash removing rod from deashing device.
The beneficial effect of the utility model is:
The utility model since itself possess from deashing and anti-clogging function; Can guarantee the long-term accuracy of measuring, improve the automatic operational percentage of boiler greatly, can reflect the size of air quantity in each airduct in time; At any time adjust boiler operatiopn; Let boiler under the operating mode of less expensive, move all the time, particularly, have the advantage of following several respects:
1. make boiler wind speed adjustment reasonable, it is more stable to burn, and can reduce the machinery and the heat loss due to unburned gas of exhaust gas temperature, reduction unburned carbon in flue dust, reduction coal dust effectively, improves boiler efficiency;
2. can guarantee the long-term accuracy of measuring, improve the automatic operational percentage of boiler greatly.The fireman can make right judgement according to the variation of air quantity, helps the safety and the economical operation of boiler;
3. can control the boiler combustion flame kernel effectively, prevent the local coking of boiler, also can prevent eccentricity of fire effectively simultaneously, reduce the deviation of stove hall outlet both sides cigarette temperature, prevent water-cooling wall and superheater booster;
4. help in the use adjustment,, can reflect the size of coal output indirectly through measuring the size that gets into each coal pulverizer air quantity to coal pulverizer wind, coal ratio;
5. adopt plug-in type to arrange, for whole wind trunk, the area that keeps out the wind of combination measuring wind speed, multipoint mode apparatus for measuring air quantity almost can be ignored; Therefore; Its pressure loss to whole air channel fluid does not almost have, and energy-saving effect is very remarkable, and easy for installation.
Other advantages, target and the characteristic of the utility model will be set forth in instructions subsequently to a certain extent; And to a certain extent; Based on being conspicuous to those skilled in the art, perhaps can from the practice of the utility model, obtain instruction to investigating of hereinafter.The target of the utility model and other advantages can realize and obtain through following instructions and claims.
Description of drawings
For the purpose, technical scheme and the advantage that make the utility model is clearer, will combine accompanying drawing that the utility model is done further to describe in detail below, wherein:
Fig. 1 is the scheme of installation of the utility model in the circular pipe cross section;
Fig. 2 is the scheme of installation of the utility model in the rectangular duct cross section.
Embodiment
Below will be with reference to accompanying drawing, the preferred embodiment of the utility model is carried out detailed description.Should be appreciated that preferred embodiment has been merely explanation the utility model, rather than in order to limit the protection domain of the utility model.
The measurement mechanism of the utility model is based on that measuring principle back-to-back develops:
When measurement mechanism is installed on the pipeline, in its probe tubular stinger, when in the pipe air current flow being arranged, the windward side receives gas shock; Herein the kinetic energy of air-flow convert to pressure can, thereby it is higher head-on to manage internal pressure, its pressure is called " total head ", leeward side is not owing to receive the air-flow punching press; Pressure in its pipe is the static pressure in the airduct, and its pressure is called " static pressure ", and the difference of total head and static pressure is called differential pressure; Its size is relevant with the interior wind speed (amount) of pipe, and wind speed (amount) is big more, and differential pressure is big more; Wind speed (amount) is little, and differential pressure is also little, therefore, as long as measure the size of differential pressure, finds out the corresponding relation of differential pressure and wind speed (amount) again, just can correctly measure air quantity in the pipe.Its computing formula is following:
Q=?K*A*f(△P,T)?(m3/h)
K---be the overall coefficient of the mathematical operation model of Wind Coverage Calculation;
A---the area of apparatus for measuring air quantity installation place;
F (△ P, T)---be function, differential pressure (△ P) Pa of unit, wind-warm syndrome (T) unit ℃ about differential pressure (△ P) and wind-warm syndrome (T);
Because the duct cross-section of first and second air quantity and powder process ventilation is bigger; Air measuring for wind trunk; It is not enough that a measurement point is only arranged; In order to measure boiler first and second air quantity and powder process ventilation exactly, therefore, the utility model is employed in and adopts the measuring principle of uniform cross section multimetering to develop on the wind trunk cross section.
As shown in the figure, the measurement mechanism of the utility model comprises a plurality of spot measurement devices, connecting pipe 2 and differential pressure transmitter 3; Wherein each spot measurement device comprises that being arranged on the inner differential pressure pressure of pipe under test pops one's head in 1; Differential pressure pressure probe 1 comprises windward side section pressure tappings and lee face section pressure tappings; During installation; A plurality of single-point pressure probes are arranged on the inner same xsect of pipe under test according to measurement requirement; Its windward side links together and mutual UNICOM through the windward side section pressure tappings of connecting pipe 2 with all differential pressure pressure probes towards the air inlet of pipeline, and the malleation side that is about to differential pressure pressure probe links together; Also link together and mutual UNICOM through the lee face section pressure tappings of connecting pipe 2 with all differential pressure pressure probes simultaneously, the suction side that is about to differential pressure pressure probe links together; The positive and negative pressure side is respectively drawn a total pressure guiding pipe 4, and said total pressure guiding pipe 4 stretches out the pipe under test outside, links to each other with the positive and negative end of differential pressure transmitter 3 respectively, thereby records the average velocity in cross section, and then calculate air quantity.
In practical application, can confirm measure dot number according to each factor such as size, straight length length of measuring sectional dimension, thereby a plurality of spot measurement device uniform cross sections are organically fitted together.
As shown in Figure 1, the two ends of differential pressure pressure probe are respectively arranged with laterally zygomorphic oblique groove 5, and the groove face is the pressure position of windward side.
As further improvement, be provided with one section ceramic wear-resisting paster 6 in the adjacent underneath annular of oblique groove.Avoid the high speed erosion corrosion of pulverized coal particle or dust, thoroughly solved the wear-resisting problem of equipment.
As further improvement, the set inside of oblique groove has from deashing device 7, is the automatic ash removing rod from deashing device.At first in each pressure pipe, hung the automatic ash removing rod; Do random swing under the impact of this rod air-flow in pipe; Play from the deashing effect; The deadweight of rod and thickness are to confirm through the experiment before dispatching from the factory, and the scope experiment according to design wind speed (amount) in first and second airduct or the powder process siphunculus on experiment table draws, and rod is too heavy too gently or too slightly too carefully all can not to meet the requirements.Secondly, apparatus for measuring air quantity itself has the fluid dynamic energy of utilization to carry out from the anticlogging function of deashing, need add any pressure gas anything but and purge, and no matter the gas dust content is much, can accomplish that fully long-time running is non-maintaining.
In general, the utlity model has following advantage:
1, can't satisfy in many occasions owing to station boiler one, two wind house steward straight length mounting conditions; And duct cross-section is big, and flow velocity is easy skewness on the cross section, in order to ensure measuring accuracy; Can a plurality of air measuring probes be carried out the uniform cross section multiple spot arranges; Malleation and malleation, negative pressure and negative pressure with each measurement mechanism interconnects then, finally draws one group of signal to transmitter, and such combination apparatus for measuring air quantity does not have too many requirement to the straight length in air channel.
2, thoroughly solved the signal blockage problem of dust-contained airflow apparatus for measuring air quantity; Apparatus for measuring air quantity itself has the fluid dynamic energy of utilization to carry out from the anticlogging function of deashing; Need add any pressure gas anything but purges; No matter the gas dust content is much, can accomplish that fully long-time running is non-maintaining.
3, apparatus for measuring air quantity stable performance, linear adjustment is good.
4, adopt plug-in type to arrange, for whole wind trunk, the area that keeps out the wind of combination apparatus for measuring air quantity almost can be ignored, and therefore, its pressure loss to whole air channel fluid does not almost have, and energy-saving effect is very remarkable, and easy for installation.
Explanation is at last; Above embodiment is only unrestricted in order to the technical scheme of explanation the utility model; Although with reference to preferred embodiment the utility model is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement the technical scheme of the utility model; And not breaking away from the aim and the scope of present technique scheme, it all should be encompassed in the middle of the claim scope of the utility model.

Claims (4)

1. multiple spot cross section type apparatus for measuring air quantity, it is characterized in that: said device comprises a plurality of spot measurement devices, connecting pipe and differential pressure transmitter;
Said spot measurement device comprises that being arranged on the inner differential pressure pressure of pipe under test pops one's head in; Said differential pressure pressure probe comprises windward side section pressure tappings and lee face section pressure tappings; The two ends of differential pressure pressure probe are respectively arranged with laterally zygomorphic oblique groove, and the groove face is the pressure position of windward side, during installation; A plurality of single-point pressure probes are arranged on the inner same xsect of pipe under test according to measurement requirement; Its windward side links together and mutual UNICOM through the windward side section pressure tappings of connecting pipe with all differential pressure pressure probes towards the air inlet of pipeline, and the malleation side that is about to differential pressure pressure probe links together; Also link together and mutual UNICOM through the lee face section pressure tappings of connecting pipe with all differential pressure pressure probes simultaneously, the suction side that is about to differential pressure pressure probe links together; The positive and negative pressure side is respectively drawn a total pressure guiding pipe, and said total pressure guiding pipe stretches out the pipe under test outside, links to each other with the positive and negative end of differential pressure transmitter respectively, thereby records the average velocity in cross section, and then calculate air quantity.
2. multiple spot cross section type apparatus for measuring air quantity according to claim 1 is characterized in that: the adjacent underneath annular of said oblique groove is provided with one section ceramic wear-resisting paster.
3. multiple spot cross section type apparatus for measuring air quantity according to claim 1, it is characterized in that: the set inside of said oblique groove has from deashing device.
4. multiple spot cross section type apparatus for measuring air quantity according to claim 3 is characterized in that: said is the automatic ash removing rod from deashing device.
CN2011205401170U 2011-12-21 2011-12-21 Multipoint cross section type air quantity measuring device Expired - Fee Related CN202420572U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011205401170U CN202420572U (en) 2011-12-21 2011-12-21 Multipoint cross section type air quantity measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011205401170U CN202420572U (en) 2011-12-21 2011-12-21 Multipoint cross section type air quantity measuring device

Publications (1)

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CN202420572U true CN202420572U (en) 2012-09-05

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104949717A (en) * 2015-06-29 2015-09-30 南京博沃科技发展有限公司 Primary air flow measuring system for entrance of coal mill
CN105444833A (en) * 2015-12-22 2016-03-30 南京天臣恒科技有限公司 Pressure equalizing chamber, mounting method thereof and three-dimension space multi-point pressure measuring and cross section type gas flow measuring device containing pressure equalizing chamber
CN105953832A (en) * 2016-04-27 2016-09-21 东南大学 Coal mill inlet primary air pipeline and air quantity and air temperature in pipeline measuring method
CN106017580A (en) * 2016-07-01 2016-10-12 浙江大唐乌沙山发电有限责任公司 Multi-point type anti-blocking wind flow measurement system
CN107289170A (en) * 2016-03-31 2017-10-24 倚世节能科技(上海)有限公司 Ventilation valve

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104949717A (en) * 2015-06-29 2015-09-30 南京博沃科技发展有限公司 Primary air flow measuring system for entrance of coal mill
CN105444833A (en) * 2015-12-22 2016-03-30 南京天臣恒科技有限公司 Pressure equalizing chamber, mounting method thereof and three-dimension space multi-point pressure measuring and cross section type gas flow measuring device containing pressure equalizing chamber
CN105444833B (en) * 2015-12-22 2018-10-19 南京铂锐能源科技有限公司 A kind of equal pressure chamber, its installation method and the section formula gas flow surveying instrument comprising it
CN107289170A (en) * 2016-03-31 2017-10-24 倚世节能科技(上海)有限公司 Ventilation valve
CN105953832A (en) * 2016-04-27 2016-09-21 东南大学 Coal mill inlet primary air pipeline and air quantity and air temperature in pipeline measuring method
CN105953832B (en) * 2016-04-27 2018-06-15 东南大学 Air quantity wind-warm syndrome measuring method in a kind of coal pulverizer inlet primary air duct and pipeline
CN106017580A (en) * 2016-07-01 2016-10-12 浙江大唐乌沙山发电有限责任公司 Multi-point type anti-blocking wind flow measurement system

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GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120905

Termination date: 20121221