CN109883913A - Improve the filter paper belt driver and method of flue gas particles β ray detection precision - Google Patents
Improve the filter paper belt driver and method of flue gas particles β ray detection precision Download PDFInfo
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Abstract
The invention discloses the filter paper belt drivers and method that improve flue gas particles β ray detection precision, including a flue gas particles β ray on-line computing model, flue gas particles β ray on-line computing model includes a mounting plate, and mounting plate is equipped with sampling unit, detection unit, filter-paper-tape, filter paper belt driver, folding and unfolding mechanism of paper, paper-pressing mechanism；Sampling unit includes flow-control module and sampling pump；Detection unit includes β ray irradiation source and detector；Filter paper belt driver includes straight line slide unit, coding counter, directive wheel, paper tape Left Drive wheel, the right driving wheel of paper tape.The present invention guarantees that filter paper is persistently tightened in filter-paper-tape moving process, not broken, not damaged, reduces the blank filter paper error in measurement process.Due to that can realize automatic zero point correcting in each measurement period, to guarantee the repeatability of apparatus measures, flue gas particles β ray detection precision is improved.
Description
Technical field
The present invention relates to a kind of filter paper belt drivers and method for improving flue gas particles β ray detection precision.
Background technique
With the technologies such as wet electric precipitation, low temperature electric precipitation in the industries minimum discharge such as coal-burning power plant, steel, coking transformation
Extensive use, discharge outlet dust concentration largely has reached 10mg/m3 hereinafter, this proposes flue gas particles detection accuracy
Higher requirement.
Flue gas particles concentration measuring method based on scattered light method cannot fully meet the standard of minimum discharge monitoring data
True property and authenticity demand, in terms of being mainly reflected in following two: although (1) light scattering technique high sensitivity, can measure low
To the dust concentration of 0.1mg/m3, but the technology is easy to be influenced by steam, and vulnerable to particulate matter size, shape, color, ingredient etc.
Many factors influence, and are difficult to adapt to that minimum discharge generates that flue-gas temperature is low, the high operating condition of humidity.(2) based on the nothing of scattering principle
By being back-scatteringme thod or Forward scattering, measurement be all particulate matter optical characteristics, then obtained by algorithm inverting
The mass concentration of particulate matter, and indirectly measurement its mass concentration, so the mass concentration that cannot complete particulate matter well is traced back
Source work.
Flue gas particle concentration measuring techniques based on β attenuation sensors are heavy using sampling using extraction-type sample mode
Particulate matter of the product on filter paper measures Beta-ray decaying the mass concentration of particulate matter, not by particulate matter size, shape, face
Color is interfered at grading factors, even particle diameter distribution, refraction coefficient, particulate matter component etc. change, will not particulate matter it is dense
Measurement accuracy is spent, and can realize tracing to the source for mass concentration.Therefore, this method is more suitable for row mouth smoke moisture is big, temperature is low
Minimum discharge work condition environment can satisfy the high precision online measuring of 10mg/m3 or less particle concentration.Chinese patent
200710122913.0 disclose a kind of β ray fume concentration direct-reading monitor and its confirm the method for finite sample, are penetrated using β
Line absorption method measures flue gas particles concentration, by increasing filter paper area, reduces sampling resistance, confirms finite sample, mention
High measurement accuracy.Chinese patent 02238238.00 discloses a kind of β ray particulate matter soot emissions continuous monitor, is penetrated using β
Line absorption method measures flue gas particles concentration, sampling and the primary completion of test, realizes the direct-reading and continuous measurement of dust concentration.
Particle monitoring instrument measurement accuracy based on β attenuation sensors during the work time may be by factors
Restrict and influence, wherein especially with sample filter paper displacement affect it is most important.The existing particle based on β attenuation sensors
Object monitoring instrument, as shown in figure 4, equipment work when, sampling filter paper 88 need by blank counts (when not sampling, β ray irradiation
Source 84 radiates, and detector 81 records blank value), then to sampling point sampling (acquiring aerosol sample on filter paper 88), finally return to
Counting (after sampling, β ray irradiation source 84 is radiated, and detector 81 records measured value) is measured to acquisition sample to measurement point
The filter paper of a certain area is substantially carried out 2 β ray radiations, obtains Sampling particles object according to activity relationship by process
Mass concentration.Therefore, how to ensure that sampling filter paper 88, detector 81, the relative position between β ray irradiation source 84 are sampling
With do not change in measurement process, be guarantee particle monitoring instrument measurement accuracy key link.
As shown in figure 5, being measured using β attenuation sensors in the equipment of particle concentration, U.S. Thermo Fisher
The FH62-C14 and its modified 5014i Beta series particle monitoring instrument of Scientific company, Horiba company, Japan
The serial particle monitoring instrument of APDA 371 is all made of in-situ type detection method in apparatus structure.Although can solve filter-paper-tape 73
Mobile bring measurement error, due to particle sampling unit (including sample gas inlet 76, sample gas export 74, sampling pump 75) and inspection
Survey unit (including radioactive source 77, detector 71) integrated design structure limited, only be detected gas at room temperature
It just can guarantee the measurement accuracy for collecting deposited particles object 72 on filter-paper-tape 73, flue gas particles measured, since pollution is arranged
The smoke moisture put is high, and sampling process is easily adsorbed on sampling official road, and therefore, sample gas requires heat to flue gas acid dew point or more
Re-sampling afterwards, and larger interference can be then brought to detection accuracy in this way, so this detection mode is only applicable in measurement atmosphere
Particulate matter, be not suitable for flue gas particles measurement.
University Of Tianjin, University Of Nanhua etc. carry out stroke control using photoelectric encoder and stepper motor cooperation, can be effective
Filter paper displacement error is reduced, the positioning accuracy of filter paper is improved.But since retractable volume filter paper roller is measuring the mistake persistently carried out
Cheng Zhong, filter paper dish external diameter size constantly change, and the torque for causing the retractable volume mechanism of step motor control to provide also constantly changes,
Therefore, it is impossible to provide constant filter paper tension, and then it cannot be guaranteed that filter-paper-tape remains tensioned state in moving process, very
It is easy to cause filter-paper-tape to be broken or damage.
Summary of the invention
The technical problem to be solved by the present invention is to a kind of filter paper V belt translations for improving flue gas particles β ray detection precision
Apparatus and method, filter paper belt driver provide stable filter paper mobile linear velocity, and retractable volume mechanism torque remains unchanged, thus
Constant filter paper tension is provided, not only can guarantee that filter paper is persistently tightened in filter-paper-tape moving process, it is not broken, not damaged, it avoids
Particulate matter from filter-paper-tape is scattered and loses, and can ensure that filter-paper-tape is smooth by the requirement of sampling and measurement and accurately arrives
Up to target position, keep particle sampling, the filter paper position of measurement and former blank filter paper position completely overlapped, to reduce
Blank error.
The present invention is achieved through the following technical solutions: a kind of filter improving flue gas particles β ray detection precision
Paper tape transmission device, including a flue gas particles β ray on-line computing model, flue gas particles β ray on-line computing model include one
Mounting plate, mounting plate are equipped with sampling unit, detection unit, filter-paper-tape, filter paper belt driver, folding and unfolding mechanism of paper, nipper
Structure；Sampling unit includes flow-control module and sampling pump；Detection unit includes β ray irradiation source and detector；Filter-paper-tape passes
Dynamic device includes straight line slide unit, coding counter, directive wheel, paper tape Left Drive wheel, the right driving wheel of paper tape；Folding and unfolding mechanism of paper includes
Paper roller, paper feeding wheel, paper tray and put paper disc；The paper-pressing mechanism includes heat-insulated hoistable platform, platform lifting pilot hole, platform
Elevating control module, sampling platen upper module, detection platen upper module and platen lower module.
Phase the same side of mounting plate is arranged in coding counter and the right driving wheel of paper tape as a preferred technical solution,；It leads
Phase the same side of mounting plate is set to wheel and paper tape Left Drive wheel.
Straight line slide unit includes stepper motor, ball screw, linear guide, shaft coupling, approaches as a preferred technical solution,
Switch, guiding slide unit, movable block, link block, driving connecting rod, Left Drive wheel link block, right driving wheel link block, support base,
Bracing strut, Left-side support plate, Right side support plate；Left Drive wheel link block and right driving wheel link block, link block are fixed on transmission
Identical side in connecting rod: link block is connected with movable block；Ball-screw is installed on link block；Bracing strut and right side branch
Fagging is separately positioned on the both ends of ball-screw；Closed coupling on bracing strut, shaft coupling connect Left-side support plate, stepper motor
It is fixed on Left-side support plate；Support base is arranged between Left-side support plate and Right side support plate；Support base and movable block it
Between setting guiding slide unit；It is oriented to slide unit and is equipped with linear guide, linear guide is positioned proximate to switch in guide runner two sides.
Paper roller and paper feeding wheel are symmetrical arranged on a mounting board as a preferred technical solution,；Paper tray is fixed on roll paper
On wheel, puts paper disc and be fixed in paper feeding wheel.
Heat-insulated hoistable platform, platform elevating control module are fixed on a mounting board as a preferred technical solution, heat-insulated liter
The side of drop platform is symmetrically arranged with detection platen upper module, sampling platen upper module；Detect platen upper module, sampling platen upper mold
Block is equipped with multiple platforms and goes up and down pilot hole；Platen lower module is arranged far from detection platen upper module side in heat-insulated hoistable platform.
Sampling pump is equipped with a sample gas inlet as a preferred technical solution, and a connecting tube is fixed in insertion in sample gas inlet,
Flow-control module is arranged in connecting tube, and connecting tube pushes module with platen and is connected.
A kind of filter-paper-tape drive method improving flue gas particles β ray detection precision: including filter paper belt driver, make
Particle sampling, the filter paper position of measurement and former blank filter paper position can be completely overlapped, to reduce blank filter paper error, mention
The measurement accuracy of high particle concentration；
Step A: blank filter paper measurement opens downwards paper-pressing mechanism by platform elevating control module first, decontrols paper feeding wheel,
Paper roller is driven by stepper motor, by coding counter command displacement amount, blank filter paper is moved to β ray irradiation source and spy
The corresponding position of device is surveyed, paper-pressing mechanism is then closed, then opens detector, stablizes after a certain period of time, starts defeated to detector
Step-by-step counting out completes the counting I1 to blank filter paper by certain measurement period；
Step B: lockking paper feeding wheel and paper roller, opens paper-pressing mechanism downwards, stepper motor drives straight line slide unit, by paper tape
Left Drive wheel and the right driving wheel of paper tape drive filter-paper-tape to be moved to the left together, and filter paper is transmitted to the corresponding position of sample gas inlet；
Step C: filter-paper-tape Sampling particles object is closed paper-pressing mechanism, opens sampling pump sampling, is surveyed by flow-control module
Determine sample gas flow Q, the particulate matter in flue gas is deposited on filter paper, after extracting specific sampling time t, completes filter paper pair
The sampling of particulate matter；
Step D: filter-paper-tape moves to right, and locks paper feeding wheel and paper roller, opens paper-pressing mechanism downwards, is driven by stepper motor straight
Line slide unit drives filter-paper-tape right dynamic to moving together, filter paper is moved to β ray irradiation from band Left Drive wheel and the right driving wheel of paper tape
Source and the corresponding position of detector.At this point, the position of particle sampling filter paper is original blank filter paper position.
Step E: measuring concentration of granules in certain；It is closed paper-pressing mechanism, then opens detector, stablizes after a certain period of time, starts
Step-by-step counting to detector output completes the counting I2 to Sampling particles object filter paper by certain measurement period.
Step F: it by measuring Sampling particles object filter paper I2 and blank filter paper count value I1, is calculated according to lower section formula
The mass concentration value C of particulate matter quality namely flue gas particles in unit volume；
The mass concentration value (mg/m3) of C in formula --- flue gas particles；
I1 --- β ray passes through the particle counting value (dimensionless) of blank filter paper；
I2 --- β ray passes through the particle counting value (dimensionless) that deposited particulate matter filter paper；
S --- the efficiently sampling area (cm2) detected on filter paper；
T --- the sample gas sampling time (min)；
Q --- flue gas sampling flow (L/min)；
μm--- flue gas particles mass-absorption coefficient (cm2/mg)
The beneficial effects of the present invention are: guarantee that filter paper is persistently tightened in filter-paper-tape moving process, it is not broken, damaged,
Reduce the blank filter paper error in measurement process.Due to that can realize automatic zero point correcting in each measurement period, to guarantee
The repeatability of apparatus measures improves flue gas particles β ray detection precision.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is with filter paper belt driver based on β attenuation sensors flue gas particles monitor structural schematic diagram；
Fig. 2 is the filter-paper-tape transmission structures schematic diagram based on β attenuation sensors flue gas particles monitor；
Fig. 3 is the detection method and step schematic diagram of β attenuation sensors flue gas particles monitor；
Fig. 4 is the β attenuation sensors particle monitoring instrument measurement structure and filter paper V belt translation schematic diagram of the prior art；
Fig. 5 is the in-situ method particulate matter detection structure schematic diagram of the prior art.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification (including any accessory claim, abstract and attached drawing), except non-specifically chatting
It states, can be replaced by other alternative features that are equivalent or have similar purpose.That is, unless specifically stated, each feature is only
It is an example in a series of equivalent or similar characteristics.
In the description of the present invention, it is to be understood that, term " one end ", " other end ", " outside ", "upper", " inside ",
The orientation or positional relationship of the instructions such as "horizontal", " coaxial ", " center ", " end ", " length ", " outer end " is based on shown in attached drawing
Orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, rather than the device of indication or suggestion meaning
Or element must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, in the description of the present invention, the meaning of " plurality " is at least two, such as two, three etc., unless otherwise
Clear specific restriction.
The term for the representation space relative position such as "upper", " top ", "lower", " lower section " that the present invention uses be for
A unit as shown in the drawings or feature are described relative to another unit or the relationship of feature convenient for the purpose of explanation.
The term of relative space position can be intended to include not Tongfang of the equipment in use or work other than orientation as shown in the figure
Position.For example, being described as being located at the unit of other units or feature " below " or " under " if the equipment in figure overturn
Other units or feature " top " will be located at.Therefore, exemplary term " lower section " can include above and below both orientation.
Equipment can otherwise be directed (be rotated by 90 ° or other directions), and used herein and space correlation is interpreted accordingly
Description language
In the present invention unless specifically defined or limited otherwise, term " setting ", " socket ", " connection ", " running through ",
Terms such as " grafting " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be with
It is mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary
The interaction relationship of connection or two elements inside a element, unless otherwise restricted clearly.For the common of this field
For technical staff, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
As shown in Figure 1-Figure 3, including a flue gas particles β ray on-line computing model, flue gas particles β ray are monitored on-line
Instrument includes a mounting plate 22, and mounting plate 22 is equipped with sampling unit, detection unit, filter-paper-tape 11, filter paper belt driver, folding and unfolding
Mechanism of paper, paper-pressing mechanism；Sampling unit includes flow-control module 7 and sampling pump 8；Detection unit includes 4 He of β ray irradiation source
Detector 1；Filter paper belt driver includes straight line slide unit, coding counter 3, directive wheel 10, paper tape Left Drive wheel 15, the paper tape right side
Driving wheel 14；Folding and unfolding mechanism of paper includes paper roller 5, paper feeding wheel 9, paper tray 20 and puts paper disc 21；The paper-pressing mechanism include every
Hot hoistable platform 2, platform lifting pilot hole 25, platform elevating control module 66, sampling platen upper module 16, detection platen upper mold
Block 13 and platen lower module 19.
Flue gas by sampling pump continuous drawing containing particulate matter, particulate matter are collected by filter paper, and flow-control module passes through measurement
With control sample throughput, it can be tested the flue flow velocity of flue gas by tracking, realize the isokinetic sampling of flue gas.Particulate matter detection unit
In detector 1 and β ray irradiation source 4 be attached separately to filter paper two sides, the mass concentration of detection unit measured value and measured matter
At certain linear relationship.It is complete according to specific process by the filter paper belt driver, folding and unfolding mechanism of paper and paper-pressing mechanism
At 3 blank filter paper measurement, particulate matter filter paper and measuring concentration of granules in certain processes, and blank is recorded by detector 1 respectively
Filter paper and the output umber of pulse that deposited particulate matter filter paper obtain the mass concentration of tested flue gas particles according to related algorithm.
Wherein, phase the same side of mounting plate is arranged in coding counter 3 and the right driving wheel 14 of paper tape；Directive wheel 10 and paper tape
Phase the same side of mounting plate is arranged in Left Drive wheel 15.
Wherein, straight line slide unit includes stepper motor 28, ball screw 39, linear guide 36, shaft coupling 30, close switch
32, slide unit 34, movable block 35, link block 40, driving connecting rod 27, Left Drive wheel link block 26, right driving wheel link block are oriented to
23, support base 33, bracing strut 31, Left-side support plate 29, Right side support plate 38；Left Drive wheel link block is connected with right driving wheel
Block, link block are fixed on identical side on driving connecting rod 27: link block is connected with movable block；Ball-screw is installed on company
It connects on block；Bracing strut and Right side support plate are separately positioned on the both ends of ball-screw；Closed coupling 30, shaft coupling on bracing strut 31
Device 30 connects Left-side support plate, and stepper motor 28 is fixed on Left-side support plate；Left-side support plate and the right side is arranged in support base
Between side support plate；Setting guiding slide unit between support base and movable block；It is oriented to slide unit and is equipped with linear guide, linear guide exists
Guide runner two sides are positioned proximate to switch.
Wherein, paper roller 5 and paper feeding wheel 9 are symmetrical arranged on a mounting board；Paper tray 20 is fixed on paper roller 5, puts paper
Disk 21 is fixed in paper feeding wheel 9.
Wherein, heat-insulated hoistable platform 2, platform elevating control module 6 are fixed on a mounting board, and the one of heat-insulated hoistable platform 2
Side is symmetrically arranged with detection platen upper module, sampling platen upper module；Platen upper module, sampling platen upper module are detected equipped with more
A platform goes up and down pilot hole；Platen lower module is arranged far from detection platen upper module side in heat-insulated hoistable platform 2.
Wherein, sampling pump 8 is equipped with a sample gas inlet, and a connecting tube, flow-control module 7 are fixed in insertion in sample gas inlet
It is arranged in connecting tube, connecting tube pushes module with platen and is connected.
Working principle: 1, stepper motor 28 drives ball screw to make rotating motion by shaft coupling, and then pushes movable block
It moves in a straight line.The effect of ball screw 39 is that rotary motion is converted to straight reciprocating motion, the frictional resistance with very little,
High-precision linear motion can be realized in high-load situations, this.The connection guiding slide unit 34 of one side movable block 35, is oriented to slide unit
It is moved in a straight line along linear guide, guarantees line of motion precision.Linear guide 36 is positioned proximate to switch 32 in guide runner two sides,
Effect is to limit the moving distance of movable block.
2, another aspect movable block is right by link block 40 and 27 connecting paper band Left Drive wheel 15 of driving connecting rod and paper tape
Driving wheel 14 realizes filter-paper-tape and links with movable block.By controlling the left and right linear reciprocating motion of movable block, filter-paper-tape is driven
Hole is moved left in the driving wheel of mounting plate and driving wheel moves left and does equidistant linear reciprocating motion between hole, and then guarantees blank
Filter paper measurement, the filter paper position in 3 stages of filter paper particulate matter and measuring concentration of granules in certain can be completely overlapped, reduce
Blank filter paper error.By the point-to-point speed for controlling straight line slide unit, it is ensured that filter-paper-tape generates smoothly mobile linear speed
Degree, avoids particulate matter and is scattered and loses from filter-paper-tape, further reduce the measurement error of flue gas particles.Pass through control
The mobile accuracy of straight line slide unit completes the accurate positionin of filter-paper-tape position, the automatic zero point school of each measurement period may be implemented
Standard improves flue gas particles β ray detection precision.
3, when filter paper belt driver drives filter-paper-tape to do left and right linear reciprocating motion, paper feeding wheel 9 and paper roller 5 are located
In lock state, and constant torque is maintained, in moving process, the filter paper strip length between paper feeding wheel 9 and paper roller 5 is kept not
Become, ensure that filter paper tension remains unchanged, remain filter-paper-tape and tighten, and is not broken, not damaged.Directive wheel 10 is used to protect
Demonstrate,prove linearity and repeatability of the filter-paper-tape in reciprocatory movement.Coding counter 3 is used to feed back next measurement period paper
With mobile precise displacement amount, to guarantee the consistency of each measurement period filter paper moving distance.
4, it samples platen upper module and detects the module that platen upper module is separate from, heat-insulated hoistable platform 2 is located at him
Centre with platen lower module, pass through the airtightness guaranteed after paper-pressing mechanism is closed, it is possible to reduce sour gas in flue gas sampling
Corrosion of the body to detection unit.In addition, heat-insulated hoistable platform 2 and mounting plate 22 are equipped with thermal insulation board 24, it is single that sampling can be cut off
Member, detection unit and the mutual heat transfer of the left and right driving wheel of paper tape that is installed on mounting plate, guarantee sample gas high temperature not
The detection accuracy of detection unit is influenced, meanwhile, also avoid moisture in the sample gas for leading to smoke collecting because temperature gradient changes
Condensation causes filter-paper-tape fracture or damaged.Platform goes up and down pilot hole and embeds Teflon guide shoe, it is ensured that heat-insulated hoistable platform 2
The smooth and stationarity for moving up and down process, avoid platen it is open and close during Caton phenomenon, also avoid mechanism
The mechanical shock caused by filter-paper-tape when closing, and then damage filter-paper-tape.
It improves the filter-paper-tape drive method of flue gas particles β ray detection precision: including filter paper belt driver, making particle
Object sampling, the filter paper position of measurement and former blank filter paper position can be completely overlapped, thus reduce blank filter paper error, raising
The measurement accuracy of grain object concentration；
Step A: blank filter paper measurement opens downwards paper-pressing mechanism by platform elevating control module 6 first, decontrols paper feeding wheel
9, blank filter paper is moved to by β ray irradiation source by 3 command displacement amount of coding counter by stepper motor driving paper roller 5
Position corresponding with detector, is then closed paper-pressing mechanism, then opens detector, stablizes after a certain period of time, starts to detection
The step-by-step counting of device output completes the counting I1 to blank filter paper by certain measurement period；
Step B: lockking paper feeding wheel 9 and paper roller 5, opens paper-pressing mechanism downwards, stepper motor drives straight line slide unit, by paper
Band Left Drive wheel 15 and the right driving wheel 14 of paper tape drive filter-paper-tape to be moved to the left together, and it is corresponding that filter paper is transmitted to sample gas inlet
Position；
Step C: filter-paper-tape Sampling particles object is closed paper-pressing mechanism, opens sampling pump sampling, is surveyed by flow-control module
Determine sample gas flow Q, the particulate matter in flue gas is deposited on filter paper, after extracting specific sampling time t, completes filter paper pair
The sampling of particulate matter；
Step D: filter-paper-tape moves to right, and locks paper feeding wheel 9 and paper roller 5, opens paper-pressing mechanism downwards, driven by stepper motor
Straight line slide unit drives filter-paper-tape right dynamic to moving together, filter paper is moved to β ray from band Left Drive wheel and the right driving wheel 14 of paper tape
Radioactive source and the corresponding position of detector.At this point, the position of particle sampling filter paper is original blank filter paper position.
Step E: measuring concentration of granules in certain；It is closed paper-pressing mechanism, then opens detector, stablizes after a certain period of time, starts
Step-by-step counting to detector output completes the counting I2 to Sampling particles object filter paper by certain measurement period.
Step F: it by measuring Sampling particles object filter paper I2 and blank filter paper count value I1, is calculated according to lower section formula
The mass concentration value C of particulate matter quality namely flue gas particles in unit volume；
The mass concentration value (mg/m3) of C in formula --- flue gas particles；
I1 --- β ray passes through the particle counting value (dimensionless) of blank filter paper；
I2 --- β ray passes through the particle counting value (dimensionless) that deposited particulate matter filter paper；
S --- the efficiently sampling area (cm2) detected on filter paper；
T --- the sample gas sampling time (min)；
Q --- flue gas sampling flow (L/min)；
μm--- flue gas particles mass-absorption coefficient (cm2/mg).
The beneficial effects of the present invention are: guarantee that filter paper is persistently tightened in filter-paper-tape moving process, it is not broken, damaged,
Reduce the blank filter paper error in measurement process.Due to that can realize automatic zero point correcting in each measurement period, to guarantee
The repeatability of apparatus measures improves flue gas particles β ray detection precision.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
The change or replacement expected without creative work, should be covered by the protection scope of the present invention.Therefore, of the invention
Protection scope should be determined by the scope of protection defined in the claims.
Claims (7)
1. a kind of filter paper belt driver for improving flue gas particles β ray detection precision, it is characterised in that: including a flue gas
Grain object β ray on-line computing model, flue gas particles β ray on-line computing model include a mounting plate, and it is single that mounting plate is equipped with sampling
Member, detection unit, filter-paper-tape, filter paper belt driver, folding and unfolding mechanism of paper, paper-pressing mechanism；Sampling unit includes flow control mould
Block and sampling pump；Detection unit includes β ray irradiation source and detector；Filter paper belt driver includes straight line slide unit, coding meter
Number device, directive wheel, paper tape Left Drive wheel, the right driving wheel of paper tape；Folding and unfolding mechanism of paper includes paper roller, paper feeding wheel, paper tray and puts
Paper disc；The paper-pressing mechanism includes heat-insulated hoistable platform, platform lifting pilot hole, platform elevating control module, samples on platen
Module, detection platen upper module and platen lower module.
2. the filter paper belt driver according to claim 1 for improving flue gas particles β ray detection precision, feature exist
In: coding counter and paper tape right driving wheel, phase the same side of mounting plate is set；Directive wheel and the setting of paper tape Left Drive wheel exist
Phase the same side of mounting plate.
3. the filter paper belt driver according to claim 1 for improving flue gas particles β ray detection precision, feature exist
In: straight line slide unit includes stepper motor, ball screw, linear guide, shaft coupling, close switch, guiding slide unit, movable block, company
Connect block, driving connecting rod, Left Drive wheel link block, right driving wheel link block, support base, bracing strut, Left-side support plate, right side branch
Fagging；Left Drive wheel link block and right driving wheel link block, link block are fixed on identical side on driving connecting rod: link block
It is connected with movable block；Ball-screw is installed on link block；Bracing strut and Right side support plate are separately positioned on ball-screw
Both ends；Closed coupling on bracing strut, shaft coupling connect Left-side support plate, and stepper motor is fixed on Left-side support plate；
Support base is arranged between Left-side support plate and Right side support plate；Setting guiding slide unit between support base and movable block；It is oriented to slide unit
It is equipped with linear guide, linear guide is positioned proximate to switch in guide runner two sides.
4. the filter paper belt driver according to claim 1 for improving flue gas particles β ray detection precision, feature exist
In: paper roller and paper feeding wheel are symmetrical arranged on a mounting board；Paper tray is fixed on paper roller, is put paper disc and is fixed on paper feeding wheel
On.
5. the filter paper belt driver according to claim 1 for improving flue gas particles β ray detection precision, feature exist
In: heat-insulated hoistable platform, platform elevating control module are fixed on a mounting board, and the side of heat-insulated hoistable platform is symmetrically arranged with detection
Platen upper module, sampling platen upper module；Detect platen upper module, sampling platen upper module is equipped with multiple platforms lifting guiding
Hole；Platen lower module is arranged far from detection platen upper module side in heat-insulated hoistable platform.
6. the filter paper belt driver according to claim 1 for improving flue gas particles β ray detection precision, feature exist
In: sampling pump is equipped with a sample gas inlet, and a connecting tube is fixed in insertion in sample gas inlet, and flow-control module is arranged in connecting tube
On, connecting tube pushes module with platen and is connected.
7. a kind of filter-paper-tape drive method for improving flue gas particles β ray detection precision, it is characterised in that: passed including filter-paper-tape
Dynamic device keeps particle sampling, the filter paper position of measurement and former blank filter paper position completely overlapped, the specific steps are as follows:
Step A: blank filter paper measurement opens downwards paper-pressing mechanism by platform elevating control module first, paper feeding wheel is decontroled, by step
Into motor driven paper roller, by coding counter command displacement amount, blank filter paper is moved to β ray irradiation source and detector
Then corresponding position is closed paper-pressing mechanism, then open detector, stablizes after a certain period of time, starts to detector output
Step-by-step counting completes the counting I1 to blank filter paper by certain measurement period；
Step B: lockking paper feeding wheel and paper roller, opens paper-pressing mechanism downwards, stepper motor drives straight line slide unit, by the left biography of paper tape
Driving wheel and the right driving wheel of paper tape drive filter-paper-tape to be moved to the left together, and filter paper is transmitted to the corresponding position of sample gas inlet；
Step C: filter-paper-tape Sampling particles object is closed paper-pressing mechanism, opens sampling pump sampling, is adopted by flow-control module measurement
Sample gas flow Q, the particulate matter in flue gas is deposited on filter paper, after extracting specific sampling time t, completes filter paper to particle
The sampling of object；
Step D: filter-paper-tape moves to right, and locks paper feeding wheel and paper roller, opens paper-pressing mechanism downwards, sliding by stepper motor driving straight line
Platform drives filter-paper-tape right dynamic to moving together from band Left Drive wheel and the right driving wheel of paper tape, by filter paper be moved to β ray irradiation source and
The corresponding position of detector.At this point, the position of particle sampling filter paper is original blank filter paper position；
Step E: measuring concentration of granules in certain；It is closed paper-pressing mechanism, then opens detector, stablizes after a certain period of time, starts to spy
The step-by-step counting for surveying device output completes the counting I2 to Sampling particles object filter paper by certain measurement period；
Step F: by measuring Sampling particles object filter paper I2 and blank filter paper count value I1, unit is calculated according to lower section formula
The mass concentration value C of particulate matter quality namely flue gas particles in volume；
The mass concentration value (mg/m3) of C in formula --- flue gas particles；
I1 --- β ray passes through the particle counting value (dimensionless) of blank filter paper；
I2 --- β ray passes through the particle counting value (dimensionless) that deposited particulate matter filter paper；
S --- the efficiently sampling area (cm2) detected on filter paper；
T --- the sample gas sampling time (min)；
Q --- flue gas sampling flow (L/min)；
μm--- flue gas particles mass-absorption coefficient (cm2/mg).
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