CN109556928A - A kind of fly ash sampling device and its operating method and its calibration measuring method - Google Patents
A kind of fly ash sampling device and its operating method and its calibration measuring method Download PDFInfo
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Abstract
The invention discloses fly ash sampling device and its operating method and its calibration measuring methods, device includes air inlet pipe, air distributor, branch pipe, sampling gun, for the air inlet of air distributor by the compressed air gas source outside air inlet pipe connection, the gas outlet of air distributor connects sampling gun by branch pipe；Sampling gun is arranged at least two, sampling gun includes regulating valve, negative pressure generator, vacuum table, general pipeline, is in charge of, sampling head, filter cylinder, junction station, the air inlet of negative pressure generator passes through regulating valve connecting branch, the bleeding point of negative pressure generator connects general pipeline, vacuum table is provided on general pipeline, the end of general pipeline is provided with junction station, is in charge of setting at least two, and the one end being in charge of connects junction station, the other end and connects sampling head by filter cylinder.The device can be sampled accurately, and can be demarcated to existing fixed fly ash sampling device, reduced the error of existing apparatus, improved the accuracy of existing apparatus, provide reliable basis for the safe and economic operation of coal-burning boiler.
Description
Technical field
The present invention relates to fired coal combustion measurement of effectiveness technical field more particularly to a kind of fly ash sampling device and its operation sides
Method and its calibration measuring method.
Background technique
Unburned carbon in flue dust is the main indicator of fired coal combustion effect, is affected to the economical operation of coal unit, therefore
The enterprises such as thermal power plant need that the flying dust in flue gas is sampled and is chemically examined daily, in this, as detection device operational effect
Important indicator, and by optimization, by unburned carbon in flue dust control in a certain range.
The fixed fly ash sampling device in thermal power plant mainly has impact type fly ash sampler, self-priming flying dust to take at present
Two kinds of sampling device:
One, impact type fly ash sampler
It hits separation fly ash sampling device to be typically mounted on the horizontal flue of boiler tail, as shown in Figure 1, hitting separation
Fly ash sampling device includes groove, ash tube, deposits ash can.Working principle an are as follows: groove is made a call into one section of seamless light pipe one end, by slope
In horizontal flue at mouth end insertion coal-burning boiler air preheater outlet, groove is located at flue central location and in face of air-flow side
To.When the flue gas for carrying fly ash granule flows through groove, fly ash granule hits pipe groove inner surface, isolates from flue gas stream
Come, under gravity along pipe fall to lower section deposit ash can.
Two, self-priming fly ash sampling device
As shown in Fig. 2, self-priming fly ash sampling device includes elbow type Fly ash sampling rifle, connecting plate, cyclone separator, deposits
Ash can, adjusts nozzle, venturi ejector pipe at exhaust pipe.Its working principle is that: venturi ejector pipe is mounted in flue, due to
It is negative pressure in flue, air enters venturi ejector pipe from entrance, produces one than negative pressure in flue in the throat of ejector pipe
Bigger negative pressure.The throat that jet expansion is located at venturi ejector pipe is adjusted, there are a pressures with negative pressure in flue for negative pressure herein
Difference, under the action of pressure difference, the flue gas for carrying flying dust enters Fly ash sampling rifle, and gas solid separation occurs in cyclone separator, flies
Ash falls into the ash can of depositing of lower part, and flue gas enters exhaust pipe, is returned again again after mixing with air at adjusting nozzle by ejector pipe
Into flue.Elbow type Fly ash sampling rifle uses static balance sampling theorem, by adjusting cut-out governing aspiration, realizes constant speed
Sampling guarantees the accuracy of coal dust sampling.
For stable Dual-Phrase Distribution of Gas olid, to correctly take out solid particle from fluid, it is necessary to meet total cross-section sampling
And isokinetic sampling.
Thermal power plant back-end ductwork sectional area is all bigger, and width is generally in 10m or so, and depth is generally in 4m or so.
Since smoke canal elbow etc. influences, distribution of the size and concentration of fly ash granule in flue cross section is very uneven, therefore from flue
The taken flying dust sample in the certain point in section, can not represent the flying dust characteristic in whole cross section.To improve the representative of Fly ash sampling
Property and accuracy, it is necessary to using gridding method total cross-section sample, i.e., flue cross section is divided into the region of tens homalographics,
The central point in each region is sampled.
So-called isokinetic sampling is exactly that the speed that gas flows in the pumping velocity and two phase flow of sampler wants equal.It is false
If the two speed difference is too many, biggish sampling error will be caused, be shown in Table 1.
Sampling result under the different pumping velocities of table 1
According to the principle of total cross-section sampling and isokinetic sampling, the work that fixed fly ash sampling device is commonly used in two kinds of analysis is special
Property:
Impact type fly ash sampler can be only installed at since working principle is to hit separation and Gravity Separation
On horizontal flue, it cannot be mounted on vertical flue, and thermal power plant's back-end ductwork is mostly vertical flue, this is just greatly limited
Its range applied；It is only a little sampled in flue, is not carried out total cross-section sampling, sample representation is poor；And it is unable to satisfy
Fast sampling requirement.
For self-priming fly ash sampling device, since unit load changes frequent occurrence, in flue the flow velocity of flue gas also with
Change.It is only a little sampled in flue, is not carried out total cross-section sampling, sample representation is poor；Current most of rotations
Wind separation drawing-in type fly ash sampling device is all only able to achieve constant speed function when boiler is in rated load, but in boiler load
After changing, there is no regulating device de-regulation pumping velocity, application range limitation is larger.
By being analyzed above it can be found that being mounted on the various fixed Fly ash samplings of thermal power plant production scene now
Device, is all unsatisfactory for total cross-section sampling substantially and isokinetic sampling, especially total cross-section sample, and is even more difficult to realize.
Summary of the invention
The present invention is directed to the deficiency of existing fixed fly ash sampling device, develops a kind of fly ash sampling device and its operation side
Method and its calibration measuring method, the fly ash sampling device can be sampled accurately, and can to existing fixed fly ash sampling device into
Rower is fixed, reduces the error of existing fixed sampler, improves the accuracy of existing fly ash sampling device, for coal-fired pot
The safe and economic operation of furnace provides reliable basis.
The technical solution of present invention solution technical problem are as follows: on the one hand, the embodiment provides a kind of flying dusts to take
Sampling device is mounted on the side wall of flue, including air inlet pipe, air distributor, branch pipe, sampling gun, the air inlet of air distributor
For mouth by the compressed air gas source outside air inlet pipe connection, the gas outlet of air distributor connects sampling gun by branch pipe；Sampling
Rifle is arranged at least two, and sampling gun includes regulating valve, negative pressure generator, vacuum table, general pipeline, is in charge of, sampling head, filter cylinder, confluence
Device, by regulating valve connecting branch, the bleeding point of negative pressure generator connects general pipeline, is arranged on general pipeline the air inlet of negative pressure generator
There is vacuum table, the end of general pipeline is provided with junction station, is in charge of setting at least two, one end connection junction station, the other end being in charge of
Sampling head is connected by filter cylinder.
As optimization, it is additionally provided with master control valve in the air inlet pipe, is additionally provided with branch road control valve on the branch pipe.
As optimization, the exhaust outlet of the negative pressure generator is additionally provided with outlet valve.
As optimization, the filter cylinder includes filter cartridge base, filter cylinder gland, and filter cartridge base is tubular, one end connection point of filter cartridge base
Pipe, the other end connect filter cylinder gland, and filter cylinder gland connects sampling head.
As optimization, the filter cylinder is glass fiber filter cylinder.
As optimization, the sampling gun is arranged at least two, and two sampling heads, each sampling gun is at least arranged in the sampling gun
Equidistantly distributed, all sampling guns are arranged on the same cross section of flue, and flue cross section is divided into multiple homalographics
Region is sampled, the air inlet of sampling head is arranged on the central point in sampling region, the side that the air inlet of sampling head comes towards flue gas
To.
As optimization, it is all be in charge of caused by air drag it is identical.
On the other hand, the embodiment provides a kind of fly ash sampling device operating methods, comprising the following steps:
A, sampling gun mounting base is welded on flue in advance；
B, the suction properties under air condition are carried out to sampling gun to test, obtains the resistance coefficient ξ of every sampling gun；Then
By temperature adjustmemt, the relation formula of sampling gun inlet and outlet differential pressure and pumping velocity under smoke behavior is obtained:
In formula: sampling gun exports negative pressure, Pa when P- realizes isokinetic sampling；
PCigaretteNegative pressure at smoke sampling point, Pa；
The suction wind speed of V- sampling gun, m/s；
T- flue-gas temperature, DEG C；
C, respectively use wind speed, temperature, device for pressure measurement, measure flue gas flow rate at each mounting base position, flue-gas temperature t and
Flue gas negative pressure PCigarette, measuring device is taken out after measurement, the suction wind speed V of sampling gun is equal with flue gas flow rate, counts according to formula A
Calculate the flue gas negative pressure value P of sampling gun outlet when each sampling gun realizes isokinetic sampling；
D, fly ash sampling device is installed, master control valve and each branch road control valve is opened, closes each negative pressure generator outlet valve,
Compressed air carries out blowback to each sampling gun and cleans sampling gun；
E, each negative pressure generator outlet valve is opened, the regulating valve of each sampling gun is adjusted, the pressure at each vacuum table is rapid
It is adjusted to the sampling gun exiting flue gas negative pressure value P being calculated in step c, each sampling gun starts to carry out Fly ash sampling；
F, after sampling, sample is collected, each negative pressure generator outlet valve is closed, each sampling gun is carried out with compressed air
Blowback waits use next time.
In another aspect, the embodiment provides a kind of fly ash sampling device calibration measuring method, including following step
It is rapid:
A. Fly ash sampling is carried out using fly ash sampling device, and measures and obtains unburned carbon in flue dust Cbd；
B. Fly ash sampling is carried out using existing fixed fly ash sampling device simultaneously, and measures and obtains unburned carbon in flue dust Cgd；
C. according to formulaThe carbon containing measurement correction factor f of existing fixed fly ash sampling device is calculated；
D. in the measurement work after, pass through existing fixed fly ash sampling device and carry out what Fly ash sampling and measuring obtained
Unburned carbon in flue dust is all only more accurate unburned carbon in flue dust multiplied by the result that f is obtained.
The effect provided in summary of the invention is only the effect of embodiment, rather than invents all whole effects, above-mentioned
Technical solution have the following advantages that or the utility model has the advantages that
1. the fly ash sampling device can total cross-section, constant speed, sample simultaneously, sampling is accurate, and fixed can fly to existing
Grey sampler is demarcated, and is reduced the error of existing fixed sampler, is improved the standard of existing fly ash sampling device
True property provides reliable basis for the firing optimization of coal-burning boiler, the safe and economic operation.
2. can be purged with compressed air to sampling gun by closing outlet valve by setting outlet valve.
3. the air inlet of sampling head is arranged in sampling area by the sampling region that flue is longitudinally divided into multiple homalographics
On the center line in domain, according to the sample tap of gridding method design fly ash sampling device, guarantee each mesh point in flue cross section
Sample can be got, total cross-section sampling is realized；All sampling heads carry out suction sampling simultaneously, can obtain all grid element centers simultaneously
Flying dust sample on point position, realizes all sample points while sampling, improve the representativeness and accuracy of Fly ash sampling.
4. keeping air drag caused by all be in charge of identical by balanced to progress resistance is respectively in charge of, guaranteeing each takes
The suction wind speed of sample mouth is almost the same, realizes isokinetic sampling.
Detailed description of the invention
Fig. 1 hits the structure principle chart of separation fly ash sampling device.
The structure principle chart of the self-priming fly ash sampling device of Fig. 2.
Fig. 3 is the front view of fly ash sampling device working condition of the invention.
Fig. 4 is cross-sectional view of the Fig. 3 along the direction A-A.
Fig. 5 is cross-sectional view of the Fig. 4 along the direction B-B
Fig. 6 is the partial enlarged view of the a-quadrant Fig. 5.
Fig. 7 is the sample point distribution map of an embodiment of the present invention.
Wherein: 1.1, flue, 1.2, ash tube, 1.3, valve, 1.4, deposit ash can；
2.1, flue, 2.2, Wen Qiuli ejector pipe, 2.3, adjusting nozzle, 2.4, exhaust pipe, 2.5, connecting plate, 2.6, whirlwind
Separator, 2.7, deposit ash can, 2.8, elbow type Fly ash sampling rifle；
3.0, air inlet pipe, 3.1, master control valve, 3.2, air distributor, 3.3, branch road control valve, 3.4, branch pipe, 3.5, tune
Save valve, 3.6, negative pressure generator, 3.7, outlet valve, 3.8, vacuum table, 3.9, flue, 3.10, general pipeline, 3.11, be in charge of, 3.12,
Filter cartridge base, 3.13, filter cylinder gland, 3.14, sampling head, 3.15, filter cylinder, 3.16, junction station.
Specific embodiment
In order to clearly illustrate the technical characterstic of this programme, below by specific embodiment, and its attached drawing is combined, to this
Invention is described in detail.Following disclosure provides many different embodiments or example is used to realize different knots of the invention
Structure.In order to simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.In addition, the present invention can be with
Repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself is not indicated
Relationship between various embodiments and/or setting is discussed.It should be noted that illustrated component is not necessarily to scale in the accompanying drawings
It draws.Present invention omits the descriptions to known assemblies and treatment technology and process to avoid the present invention is unnecessarily limiting.Art
The orientation or positional relationship of the instructions such as language "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second ", " third " are used for description purposes only, and it should not be understood as instruction or dark
Show relative importance.In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.
In order to improve the accuracy of Fly ash sampling, it is necessary to meet the requirement of total cross-section sampling and isokinetic sampling.In addition to this,
When carrying out flying dust rating test, coal unit will receive the influence of external disturbance and internal disturbance.External disturbance is mainly thrown
Electric load variation after entering AGC, internal disturbance is mainly the variation of as-fired coal matter.It disturbs outside and has seriously affected boiler operatiopn with interior disturb
The stabilization of parameter causes the unburned carbon in flue dust in flue changing always.It is disturbed with interior to flying dust to eliminate to disturb outside unit
The influence of caliberating device sampling property accuracy, when carrying out total cross-section sampling, it is necessary to all sample points are sampled simultaneously, because
This flying dust caliberating device must satisfy three requirements: total cross-section sampling, isokinetic sampling, all sample points while sample.
Fig. 3 to Fig. 7 is a kind of embodiment of the invention, as shown, a kind of fly ash sampling device, is mounted on flue 3.9
Side wall on, including air inlet pipe 3.0, air distributor 3.2, branch pipe 3.4, sampling gun, the air inlet of air distributor 3.2 pass through
Air inlet pipe 3.0 connects external compressed air gas source, and the gas outlet of air distributor 3.2 connects sampling gun by branch pipe 3.4；It takes
Sample rifle is arranged seven, and sampling gun includes regulating valve 3.5, negative pressure generator 3.6, vacuum table 3.8, general pipeline 3.10, is in charge of 3.11, takes
Sample head 3.14, filter cylinder 3.15, junction station 3.16, the air inlet of negative pressure generator 3.6 are born by 3.5 connecting branch 3.4 of regulating valve
It presses the bleeding point of generator 3.6 to connect general pipeline 3.10, vacuum table 3.8, the end setting of general pipeline 3.10 is provided on general pipeline 3.10
There is junction station 3.16, be in charge of 3.11 setting three, is in charge of 3.11 one end connection junction station 3.16, the other end passes through filter cylinder 3.15
Connect sampling head 3.14.The fly ash sampling device can total cross-section, constant speed, sample simultaneously, sampling is accurate, and can be to existing fixation
Formula fly ash sampling device is demarcated, and is reduced the error of existing fixed sampler, is improved existing fly ash sampling device
Accuracy, provide reliable basis for the firing optimization of coal-burning boiler, the safe and economic operation.
It is additionally provided with master control valve 3.1 in the air inlet pipe 3.0, is additionally provided with branch road control valve on the branch pipe 3.4
3.3.The exhaust outlet of the negative pressure generator 3.6 is additionally provided with outlet valve 3.7.It, can be by closing out by the way that outlet valve 3.7 is arranged
Mouth valve 3.7, purges sampling gun with compressed air.
The filter cylinder 3.15 includes filter cartridge base 3.12, filter cylinder gland 3.13, and filter cartridge base 3.12 is tubular, filter cartridge base 3.12
3.11, other end connection filter cylinder gland 3.13 is in charge of in one end connection, and filter cylinder gland 3.13 connects sampling head 3.14.The filter cylinder is
Glass fiber filter cylinder.The effect of sampling gun is the flue gas extracted in flue and is isolated fly ash granule by glass fiber filter cylinder
Come.The effect of branch pipe 3.4 is that compressed air is sent to each sampling gun from air distributor 3.2.The effect of branch road control valve 3.3 is
The compressed air of each branch pipe 3.4 of on-off.The effect of air distributor 3.2 be compressed air is distributed to each branch pipe 3.4 carry out it is winged
Ash sampling.The effect of master control valve 3.1 is the compressed air that on-off gas source comes.For sampling gun, the effect of sampling head is to extract
Flue gas containing fly ash granule.The effect of filter cylinder gland is to be fixed on sampling head on filter cartridge base and compress filter cylinder.The effect of filter cylinder
It is to filter down the fly ash granule in flue gas when flue gas flows through.The effect of filter cartridge base is to place filter cylinder.It is in charge of 3.11 work
Be by each sampling head come flue gas lead to flue gas junction station.The effect of flue gas junction station be by multiple sampling heads come flue gas into
Row mixing.The effect of sampling gun general pipeline is to send mixed flue gas to negative pressure generator.The effect of vacuum table is measurement sampling
Rifle exiting flue gas negative pressure.The effect of negative pressure generator is to provide suction power.The effect of regulating valve 3.5 is to adjust negative pressure generator
Preceding compressed air pressure.
The sampling gun is arranged seven, and three sampling heads 3.14, each sampling gun equidistantly distributed, institute is arranged in the sampling gun
There is sampling gun to be arranged on the same cross section of flue 3.9,3.9 cross section of flue is divided into the sampling area of multiple homalographics
Domain, the air inlet of sampling head 3.14 are arranged on the central point in sampling region, what the air inlet of sampling head 3.14 came towards flue gas
Direction.By the way that the air inlet setting in the longitudinal sampling region for being divided into multiple homalographics of flue 3.9, sampling head 3.14 is being sampled
On the center line in region, according to the sample tap of gridding method design fly ash sampling device, guarantee each mesh point in flue cross section
Sample can be got, total cross-section sampling is realized；All sampling heads 3.14 carry out suction sampling simultaneously, can obtain all nets simultaneously
Flying dust sample in lattice center position realizes all sample points while sampling, and improves the representativeness and standard of Fly ash sampling
True property.As shown in figure 4, seven sampling guns are arranged on the same cross section of flue, every sampling gun is set there are three sampling head, as schemed
Shown in 7, the cross section of flue 3.9 is divided into the sampling region of 21 homalographics, the sampling area of 21 homalographics
Domain forms a grid, and the air inlet of 21 sampling heads 3.14 is separately positioned in net center of a lattice.
It is all be in charge of 3.11 caused by air drag it is identical.By making to own to 3.11 carry out resistances equilibriums are respectively in charge of
Air drag caused by being in charge of 3.11 is identical, guarantees that the suction wind speed of each sample tap is almost the same, realizes isokinetic sampling.
Specific way is: shorter for length is in charge of 3.11, can be in charge of in 3.11 that restricting element is arranged or reduces at this and is in charge of
3.11 local caliber, to increase the air drag for being in charge of 3.11.Sampling gun is subjected to the suction properties under air condition
Test, obtains the resistance coefficient of every sampling gun, then by temperature adjustmemt, obtains sampling gun under working condition and imports and exports differential pressure
With the relation formula of pumping velocity.Practical flue gas flow rate is measured using wind speed measuring device, reality is then calculated by formula
The outlet negative pressure value of sampling gun when existing isokinetic sampling adjusts vacuum table by regulating valve 3.5 when actually carrying out Fly ash sampling
Pressure at 3.8 maintains sampling gun outlet negative pressure on calculated value, so that it may realize isokinetic sampling.
A kind of fly ash sampling device operating method, comprising the following steps:
A, sampling gun mounting base is welded on flue 3.9 in advance；
B, the suction properties under air condition are carried out to sampling gun to test, obtains the resistance coefficient ξ of every sampling gun；Then
By temperature adjustmemt, the relation formula of sampling gun inlet and outlet differential pressure and pumping velocity under smoke behavior is obtained:
In formula: sampling gun exports negative pressure, Pa when P- realizes isokinetic sampling；
PCigaretteNegative pressure at smoke sampling point, Pa；
The suction wind speed of V- sampling gun, m/s；
T- flue-gas temperature, DEG C；
C, respectively use wind speed, temperature, device for pressure measurement, measure flue gas flow rate at each mounting base position, flue-gas temperature t and
Flue gas negative pressure PCigarette, measurement result is respectively V1、V2、V3、V4、V5、V6、V7、t1、t2、t3、t4、t5、t6、t7、PCigarette, taken after measurement
The suction wind speed V of measuring device out, sampling gun is equal with flue gas flow rate, calculates each sampling gun according to formula A and realizes constant speed.It takes
The flue gas negative pressure value that sampling gun exports when sample, calculated result are followed successively by P1、P2、P3、P4、P5、P6、P7。
D, fly ash sampling device is installed, master control valve 3.1 and each branch road control valve 3.3 is opened, closes each negative pressure generator
Outlet valve 3.7, compressed air carry out blowback to each sampling gun and clean sampling gun；
E, each negative pressure generator outlet valve 3.7 is opened, the regulating valve 3.5 of each sampling gun is adjusted, at each vacuum table 3.8
Pressure is adjusted to rapidly the sampling gun exiting flue gas negative pressure value P being calculated in step c1、P2、P3、P4、P5、P6、P7, each sampling gun
Start to carry out Fly ash sampling；
F, after sampling, sample is collected, each negative pressure generator outlet valve 3.7 is closed, with compressed air to each sampling gun
Blowback is carried out, waits use next time.
Requirement of the thermal power plant to fixed fly ash sampling device, whether mainly whether simple from structure, operation convenient,
Whether operation is reliable etc. to consider, the requirement to sampling accuracy is not high.If fully according to total cross-section sampling and constant speed
Fixed fly ash sampling device is installed in the requirement processing of sampling, and structure will be very complicated, is easy dust stratification blocking, operational reliability
It is very poor.In order to make up the deficiency for commonly using fixed fly ash sampling device sampling accuracy difference, therefore use Fly ash sampling with high accuracy
Device carries out calibration measurement.A kind of fly ash sampling device calibration measuring method, comprising the following steps:
A. Fly ash sampling is carried out using fly ash sampling device, and measures and obtains unburned carbon in flue dust Cbd；
B. Fly ash sampling is carried out using existing fixed fly ash sampling device simultaneously, and measures and obtains unburned carbon in flue dust Cgd；
C. according to formulaThe carbon containing measurement correction factor f of existing fixed fly ash sampling device is calculated；
D. in the measurement work after, pass through existing fixed fly ash sampling device and carry out what Fly ash sampling and measuring obtained
Unburned carbon in flue dust is all only more accurate unburned carbon in flue dust multiplied by the result that f is obtained.
In embodiment as shown in Figure 3, while carrying out Fly ash sampling using fly ash sampling device, existing fixation is carried out
The Fly ash sampling of formula fly ash sampling device.After the completion of sampling, takes out existing fixed fly ash sampling device and deposit the flying dust in ash can
Sample is labeled as fhgd.7 sampling guns are taken out from flue simultaneously, close master control valve (3.1) and each branch road control valve.It will be each
Flying dust sample in sampling gun filter cylinder takes out, and is put into sampling bag, marks, the flying dust in first sampling gun, three filter cylinders,
Successively fh11、fh12、fh13, and so on, last 7th three flying dusts are denoted as fh71、fh72、fh73, after flying dust all takes out,
Each flying dust sample is subjected to unburned carbon in flue dust measurement, the flying dust result of laboratory test of fixed fly ash sampling device is Cgd,
The unburned carbon in flue dust result of laboratory test of flying dust caliberating device is followed successively by C11、C12、C13、…C71、C72、C73, obtained by following formula
Fixed fly ash sampling device flying marking quantity correction coefficient,
C in formulapjThe average value of all flying dust sample unburned carbon in flue dust of flying dust calibration system, %；
CijThe taken flying dust sample phosphorus content of each filter cylinder of flying dust calibration system, %；
The fixed fly ash sampling device flying marking quantity correction coefficient of f-, %；
CgdFixed fly ash sampling device samples taken phosphorus content, %.
It, can be to solid in measurement work later after obtaining fixed fly ash sampling device flying marking quantity correction coefficient f
The phosphorus content result of fixed pattern fly ash sampling device samples taken is modified as the following formula, so that it may be obtained more accurate flying dust and be contained
Carbon content analysis result.
Cfh=f × Cgd
C in formulafhRevised fixed fly ash sampling device samples taken phosphorus content, %.
Although above-mentioned be described in conjunction with specific embodiment of the attached drawing to invention, not to the scope of the present invention
Limitation, based on the technical solutions of the present invention, those skilled in the art do not need to make the creative labor and can make
Various modifications or changes still within protection scope of the present invention.
Claims (9)
1. a kind of fly ash sampling device is mounted on the side wall of flue (3.9), it is characterized in that: including air inlet pipe (3.0), air
Distributor (3.2), branch pipe (3.4), sampling gun, the air inlet of air distributor (3.2) pass through outside air inlet pipe (3.0) connection
The gas outlet of compressed air gas source, air distributor (3.2) connects sampling gun by branch pipe (3.4)；Sampling gun setting at least two
Root, sampling gun include regulating valve (3.5), negative pressure generator (3.6), vacuum table (3.8), general pipeline (3.10), are in charge of (3.11), take
The air inlet of sample head (3.14), filter cylinder (3.15), junction station (3.16), negative pressure generator (3.6) is connected by regulating valve (3.5)
The bleeding point of branch pipe (3.4), negative pressure generator (3.6) connects general pipeline (3.10), and general pipeline is provided with vacuum table on (3.10)
(3.8), the end of general pipeline (3.10) is provided with junction station (3.16), is in charge of (3.11) and is arranged at least two, is in charge of (3.11)
One end connects junction station (3.16), the other end passes through filter cylinder (3.15) connection sampling head (3.14).
2. a kind of fly ash sampling device according to claim 1, characterized in that be additionally provided on the air inlet pipe (3.0)
Master control valve (3.1) is additionally provided with branch road control valve (3.3) on the branch pipe (3.4).
3. a kind of fly ash sampling device according to claim 1, characterized in that the exhaust of the negative pressure generator (3.6)
Mouth is additionally provided with outlet valve (3.7).
4. a kind of fly ash sampling device according to claim 1, characterized in that the filter cylinder (3.15) includes filter cartridge base
(3.12), filter cylinder gland (3.13), filter cartridge base (3.12) are tubular, and (3.11), another are in charge of in one end connection of filter cartridge base (3.12)
One end connects filter cylinder gland (3.13), and filter cylinder gland (3.13) connects sampling head (3.14).
5. a kind of fly ash sampling device according to claim 1, characterized in that the filter cylinder (3.15) is glass fibre filter
Cylinder.
6. a kind of fly ash sampling device according to claim 1, characterized in that the sampling gun is arranged at least two, institute
It states sampling gun and two sampling heads (3.14), each sampling gun equidistantly distributed is at least set, all sampling guns are arranged in flue (3.9)
Same cross section on, flue (3.9) cross section is divided into the sampling region of multiple homalographics, the air inlet of sampling head (3.14)
Mouth is arranged on the central point in sampling region, the direction that the air inlet of sampling head (3.14) comes towards flue gas.
7. a kind of fly ash sampling device according to claim 1, characterized in that all to be in charge of air caused by (3.11)
Resistance is identical.
8. a kind of fly ash sampling device operating method, applied to the fly ash sampling device described in claim 1 to 7, characterized in that
The following steps are included:
A, sampling gun mounting base is welded on flue (3.9) in advance；
B, the suction properties under air condition are carried out to sampling gun to test, obtains the resistance coefficient ξ of every sampling gun；Then pass through
Temperature adjustmemt obtains the relation formula of sampling gun inlet and outlet differential pressure and pumping velocity under smoke behavior:
In formula: sampling gun exports negative pressure, Pa when P- realizes isokinetic sampling；
PCigaretteNegative pressure at smoke sampling point, Pa；
The suction wind speed of V- sampling gun, m/s；
T- flue-gas temperature, DEG C；
C, wind speed, temperature, device for pressure measurement are used respectively, measure flue gas flow rate, flue-gas temperature t and flue gas at each mounting base position
Negative pressure PCigarette, measuring device is taken out after measurement, the suction wind speed V of sampling gun is equal with flue gas flow rate, calculates according to formula A
The flue gas negative pressure value P of sampling gun outlet when each sampling gun realizes isokinetic sampling；
D, fly ash sampling device is installed, master control valve (3.1) and each branch road control valve (3.3) is opened, closes each negative pressure generator
Outlet valve (3.7), compressed air carry out blowback to each sampling gun and clean sampling gun；
E, each negative pressure generator outlet valve (3.7) is opened, the regulating valve (3.5) of each sampling gun is adjusted, at each vacuum table (3.8)
Pressure be adjusted to the sampling gun exiting flue gas negative pressure value P being calculated in step c rapidly, each sampling gun starts to carry out flying dust to take
Sample；
F, after sampling, collect sample, close each negative pressure generator outlet valve (3.7), with compressed air to each sampling gun into
Row blowback waits use next time.
9. a kind of fly ash sampling device calibration measuring method, using the fly ash sampling device described in claim 1 to 7 to existing solid
Fixed pattern fly ash sampling device carries out calibration measurement, characterized in that the following steps are included:
A, Fly ash sampling is carried out using the fly ash sampling device described in claim 1 to 7, and measures and obtains unburned carbon in flue dust Cbd；
B, Fly ash sampling is carried out using existing fixed fly ash sampling device simultaneously, and measures and obtains unburned carbon in flue dust Cgd；
C, according to formulaThe carbon containing measurement correction factor f of existing fixed fly ash sampling device is calculated；
D, in measurement work later, Fly ash sampling is carried out by existing fixed fly ash sampling device and measures obtained flying dust
Phosphorus content is all only more accurate unburned carbon in flue dust multiplied by the result that f is obtained.
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