CN207502430U - It is a kind of can on-line proving bypass sampling type micro-wave survey unburned carbon in flue dust equipment - Google Patents
It is a kind of can on-line proving bypass sampling type micro-wave survey unburned carbon in flue dust equipment Download PDFInfo
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- CN207502430U CN207502430U CN201720828569.6U CN201720828569U CN207502430U CN 207502430 U CN207502430 U CN 207502430U CN 201720828569 U CN201720828569 U CN 201720828569U CN 207502430 U CN207502430 U CN 207502430U
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Abstract
The utility model discloses belong to coal steam-electric plant smoke microwave measuring equipment range it is a kind of can on-line proving bypass sampling type micro-wave survey unburned carbon in flue dust equipment.The equipment is using bypass sampling, and the on-line checking of unburned carbon in flue dust and the equipment of calibration in thermal power plant's flue are measured with Microwave Measurement Technique.It is made of MMU microwave measurement unit, sampler, caliberating device；Wherein bypass sample cell connects isolating valve, calibration valve and blow down valve by four-way pipe respectively；Isolating valve, connect by pipeline through upper mounting flange with sampling mouth, demarcate valve and standard gray sample bottle connect and compose can on-line proving bypass sampling device.Compared with previous measurement method, previous measurement method usually only characterizes unburned carbon in flue dust with power attenuation, and measurement accuracy is not high；Unburned carbon in flue dust is characterized with double parameter functions, some disturbing factors is effectively eliminated, higher measuring accuracy can be obtained.
Description
Technical field
The utility model belongs to coal steam-electric plant smoke microwave measuring equipment range；More particularly to it is a kind of can on-line proving bypass
It samples type micro-wave and surveys unburned carbon in flue dust equipment.Specifically using bypass sampling, measured in thermal power plant's flue with Microwave Measurement Technique
The on-line checking of unburned carbon in flue dust and the equipment of calibration.
Background technology
In existing technology, using the equipment of microwave progress fume duct fly ash carbon content detection, it is broadly divided into two kinds:Resonance
Cell method, chimney flue type attenuation measurement method.
Using microwave resonance cell method measure unburned carbon in flue dust Chinese patent 00240532, by measure resonator quality because
It counts to determine unburned carbon in flue dust.And the load of resonator can influence Q values, load is bigger, and Q values are lower, and ash sample pipe is also to load, institute
Must limit the diameter of ash sample pipe in order to which the load of ash sample pipe is made to become smaller, the maximum inner diameter which has selected is 8mm, minimum
4mm.Ash sample pipe is very thin, will be easy to stifled ash, and fly ash granule is tiny, and quality is low, easily adheres to tube wall, get deeper to be formed it is stifled
Ash.
Unburned carbon in flue dust is measured using microwave attenuation, is typically employed in flue both sides installation microwave transmitting antenna and microwave
Reception antenna emits signal by absorption of the flying dust to microwave energy in flue so that in other end reception antenna by measurement
The signal power attenuation received, then this decay is scaled the value of unburned carbon in flue dust by detection device.Such as Chinese patent
ZL01210622.4. although this kind of patent avoids stifled grey problem, but there are a lot of other serious problems again：
1) reflection problems.Flue inner wall is all metal material, incidence wave is all reflected, in the signal that receiving terminal receives
Interference signal containing multiple reflections can lead to larger measurement error.
2) it can not be demarcated.The pass needed between unburned carbon in flue dust and microwave power attenuation is measured in the actual environment
Be that curve is demarcated, but due to measurement space be exactly flue in itself, this mode is difficult to demarcate.And measurement process
In, it can not also be re-scaled online after coal type change.The accuracy of measurement can not ensure.
Utility model content
The purpose of this utility model be provide in view of the deficiencies of the prior art it is a kind of can on-line proving bypass sampling decline
Wave surveys unburned carbon in flue dust equipment；The equipment is made of MMU microwave measurement unit, sampler, caliberating device；Wherein microwave measurement fills
It puts and is made of microwave source, directional coupler, transmitting antenna, reception antenna, width phase detection module and unburned carbon in flue dust processing module；
And transmitting antenna and reception antenna are opposite mounted on sample both sides；It is characterized in that, the equipment is sampled using bypass, use is micro-
Wave measurement technology measures the on-line checking of unburned carbon in flue dust and the equipment of calibration in thermal power plant's flue；Wherein directional coupler is distinguished
It is connected with transmitting antenna, width phase detection module；Reception antenna is connect with width phase detection module；And transmitting antenna 3 and reception day
Line 5 is opposite to be mounted on 4 both sides of bypass sample cell；Bypass sample cell 4 connects isolating valve, 12,13 and of calibration valve by four-way pipe respectively
Blow down valve 14；Isolating valve, 12 is connect by pipeline 17 through upper mounting flange 11 with sampling mouth 9, and calibration valve 13 connects with standard gray sample bottle 8
Connect form can on-line proving bypass sampling device.
The upper mounting flange 11 is fixed on mouth 9 is sampled in flue inner wall.
The blow down valve 14 connects compressed air valve 15 and fluid valve 16 by three-way pipe respectively, and fluid valve 16 passes through threeway
Pipe connects bypass sample cell 4 respectively and ejector 19, ejector 19 are connect with lower mounting flange 18, and lower mounting flange 18 is by ash discharge
Mouth 10 is fixed in flue inner wall.
The bypass sample cell selects the quartz glass tube of wave transparent, and dielectric loss is 0.005 hereinafter, suction to microwave signal
Very little is received, while the cross-sectional area of sample cell should be more than the three times of Antenna aperture area.
Before the bypass sampling device need to be mounted on air preheater, bypass sampling device bypasses sample cell by sampler
It is formed with fluidic device；Sampler takes out ash sample by fluidic device drainage from flue.
The caliberating device is the core design for realizing on-line proving, the pipeline mainly after sampler to bypass sample
Between quality control, there is provided a four-way pipelines and three valves：Isolating valve, demarcates valve and blow down valve；Isolating valve, is opened, is closed in addition
Two, system is in measuring state at this time, once closing isolating valve, system stops real-time sampling.Blow down valve is being opened, is utilizing pressure
Contracting air purges remaining flying dust in the duct, prevents its pollution norms ash sample, influences calibration result,
The utility model advantageous effect is：
First bypass sample cell is effectively reduced the reflection problems during chimney flue type measures, is avoided survey using electromagnetic wave transparent material
The problem of amount signal is flooded by reflection signal improves the accuracy of measuring signal.
Second sampler is mounted on the top of air preheater, and the temperature of flue gas is higher, and using bypass sampling, ensures high temperature
Flue gas in bypass in flow regime, self-heating pipeline, so will not condense.In addition the size ratio Resonant-cavity Method of sample cell
Big is more, reduces the small caused stifled grey problem of caliber.
The mode that two kinds of parameters of third measure simultaneously obtains power attenuation and the phase change of microwave signal, is sent into and flies
Unburned carbon in flue dust is calculated in grey phosphorus content computing unit, can obtain better linear calibration's curve in this way.
4th uses bypass duct, by closing isolating valve, opens calibration valve, can carry out staking-out work online, demarcate
Cheng Hou can open isolating valve, at any time, close calibration valve, convert to measuring state.Bypass sampling can solve flue and directly survey
Measure the staking-out work that can not be completed.
Description of the drawings
Fig. 1 be can on-line proving bypass sample type micro-wave carbon testing device schematic diagram.
Fig. 2 (a) is unburned carbon in flue dust and microwave power attenuation relation figure.
Fig. 2 (b) is unburned carbon in flue dust and attenuation, the relational graph of the double parameter function f of phase shift.
Fig. 3 is sample cell and Antenna aperture size relationship figure.
Specific embodiment
The utility model provide it is a kind of can on-line proving bypass sampling type micro-wave survey unburned carbon in flue dust equipment, the equipment by
MMU microwave measurement unit, sampler, caliberating device composition.The utility model is made with reference to the accompanying drawings and examples apparent
Explanation and illustration.
As shown in Figure 1 for can on-line proving bypass sample type micro-wave carbon testing device schematic diagram.The equipment is by microwave measurement
Device, sampler, caliberating device composition.In figure, microwave source 1, directional coupler 2 and transmitting antenna 3 are connected, directional coupler
2 connect again with width phase detection module 6, reception antenna 5；And transmitting antenna 3 and opposite be mounted on of reception antenna 5 bypass sample cell
4 both sides；Unburned carbon in flue dust processing module 7 connect composition MMU microwave measurement unit with width phase detection module 6；Bypass sample cell 4 passes through
Four-way pipe connects isolating valve, 12, calibration valve 13 and blow down valve 14 respectively；Isolating valve, 12 is by pipeline 17 through upper mounting flange 11 with taking
Sample mouth 9 connects, calibration valve 13 and standard gray sample bottle 8 connect and compose can on-line proving bypass sampling device.Wherein upper Method for Installation
Sampling mouth 9 is fixed in flue inner wall by orchid 11.Blow down valve 14 connects compressed air valve 15 and fluid valve by three-way pipe respectively
16, fluid valve 16 connects bypass sample cell 4 respectively by three-way pipe and ejector 19, ejector 19 connect with lower mounting flange 18
It connects, ash discharging hole 10 is fixed in flue inner wall by lower mounting flange 18.
The blow down valve 14 connects compressed air valve 15 and fluid valve 16 by three-way pipe respectively, and fluid valve 16 passes through threeway
Pipe connects bypass sample cell 4 respectively and ejector 19, ejector 19 are connect with lower mounting flange 18, and lower mounting flange 18 is by ash discharge
Mouth 10 is fixed in flue inner wall.Wherein bypass sample cell select wave transparent quartz glass tube, dielectric loss 0.005 hereinafter,
To the absorption very little of microwave signal, while the cross-sectional area of sample cell should be more than the three times of Antenna aperture area (such as Fig. 3 institutes
Show).
The bypass sampling device is by sampler, sample cell and fluidic device composition；Sampler is drained by fluidic device
Ash sample is taken out in effect from flue, i.e. Venturi effect is utilized in fluidic device, and negative pressure is formed in sample cell, in the work of negative pressure
Under, ash sample is inhaled into sample cell, is further continued for coming back to flue by suction function arrival ash discharging hole later；Bypass sampling dress
It puts before need to being mounted on air preheater, flue-gas temperature is higher herein, and generally at 300 DEG C or more, the flying dust flue gas of extraction is entire
Moment flowing update, can also install thermal insulation material additional, further keep fume high-temperature, heat outside in pipeline and bypass sample cell 4
Pipeline, this just establishes a small bypass sample cell outside flue collector, and flying dust therein keeps the flow velocity identical with flue collector
And concentration, and because flue gas constantly flows, bypass can keep certain temperature, can effectively overcome similar resonance in this way
Chamber measurement method medium temperature blocks up ash caused by spending low moisture condensation.
The caliberating device is the core design for realizing on-line proving, the pipeline mainly after sampler to bypass sample
Between quality control, there is provided a four-way pipelines and three valves：Isolating valve, demarcates valve and blow down valve.Isolating valve, is usually opened, is closed
Other two is closed, system is in measuring state at this time, once closing isolating valve, system stops real-time sampling.Blow down valve is being opened,
Remaining flying dust in the duct is purged using compressed air, its pollution norms ash sample is prevented, influences calibration result, purge
Time is about 3min, and purging is completed to open calibration valve again, and standard ash sample is drained by calibration valve by drainage unit, by sample cell
On-line proving is carried out, is further continued for coming back to flue by suction function arrival ash discharging hole later；Replace the standard of different phosphorus content
Ash sample, you can obtain complete calibration result, when coal changes, need replacing standard ash sample, re-scale.Described
The flying dust that standard ash sample is obtained for practical place power plant, the carbon-free ash sample and purity that calcination generates in Muffle furnace
99.99% graphite is matched to obtain.
Can on-line proving bypass sampling type micro-wave survey unburned carbon in flue dust equipment operation principle：Microwave source 1 generates fixation
The microwave of frequency is divided into two paths of signals by directional coupler 2, and measuring signal is sent in transmitting antenna 3 all the way, another way
Width phase detection module 6 is sent directly into as reference signal；The electromagnetic wave of leading is converted to plane wave in space by transmitting antenna 3,
By the bypass sample cell 4 for thering is flying dust to flow；Uncombusted carbon granules in its flying dust is converted into graphite state, there is good suction to microwave
Adduction leads to power attenuation and the phase offset of microwave；After signal passes through flying dust and sample cell, radiation signal is received antenna
5 receive, and are converted to guided wave, and the comparison of amplitude and phase is carried out into width phase detection module 6 and reference signal, obtains power
Two signals are finally sent to signal processing module 7 by attenuation and phase shift, calculate double parameter function f (attenuation, phase shift),
Further according to the relationship of f (attenuation, phase shift) and unburned carbon in flue dust obtain unburned carbon in flue dust (unburned carbon in flue dust as shown in Fig. 2 (b) with
Attenuation, the relational graph of the double parameter function f of phase shift)；Detection (the flying marking as shown in Fig. 2 (a) of single parameter different from the past
Amount and microwave power attenuation relation figure), this width phase detection module need acquisition is received by reception antenna simultaneously measuring signal with
The reference signal that directional coupler separates employs two parameters of attenuation and phase shift to calculate unburned carbon in flue dust；Previous measurement
Mode usually only characterizes unburned carbon in flue dust with power attenuation, and measurement accuracy is not high；Unburned carbon in flue dust is characterized with double parameter functions, is had
Some disturbing factors of the elimination of effect, can obtain higher measuring accuracy.
On-line checking and calibration main working process are as follows：In on-line checking, isolating valve, 12, compressed air valve are opened
15th, fluid valve 16, close calibration valve 13 and blow down valve 14, and compressed air reaches jet stream by compressed air valve 15, fluid valve 16
Device 19 generates negative pressure and causes negative pressure occur at sampling mouth 9, so as to which fly ash granule can enter sampling mouth 9, is flowed by isolating valve, 12
Through bypassing sample cell 4, ash discharging hole 10 is reached by 19 sucking action of ejector and is flow back in flue.When needing to be switched to calibration state,
It excludes firstly the need of by the test ash sample in pipeline, first to be purged.Purging state is switched to by detection state, need to close every
Disconnected valve 12, opens blow down valve 14, other remain unchanged, and at this moment endlessly compressed air enters bypass sample by blow down valve 14
Remaining flying dust in entire pipeline is all rejected in flue by quality control 4.After purging a period of time, it is possible to switching calibration shape
State needs to close blow down valve 14 at this time, opens calibration valve 13, other remain unchanged.At this moment compressed air is through 16 shape of fluid valve
Into negative pressure, and standard ash sample 8 is attracted due to suction function and is flowed through bypass sample cell 4 using ejector 19, most Zhongdao ash discharge
Mouth 10 enters flue.The standard ash sample from 0% to 20% is demarcated successively, demarcates a kind of ash sample of phosphorus content every time, it is primary to demarcate
It after complete, needs to back switch to purging state purging, excludes to remain in the influence of the former standard ash sample in pipeline.Then again
It switches to calibration state to continue to demarcate, is so repeated up to calibration and completes.This calibration process can be completed with direct-on-line, be solved
Flue directly measures the problem of formula can not demarcate.And when coal type change, standard ash sample can be replaced in real time, calibrates difference
The phosphorus content curve of coal ensures the accuracy measured.
The antenna and and measure pipeline and encapsulated with black box, black box inner wall patch absorbing material, the electromagnetic wave for reducing surrounding does
It disturbs and other reflection interferences., between valve and pipeline, bypass junction between sample cell 4 and pipeline 17 and apply fluid sealant, prevent thin
Small flying dust overflows into measuring apparatus.
Claims (5)
1. it is a kind of can on-line proving bypass sampling type micro-wave survey unburned carbon in flue dust equipment, wherein MMU microwave measurement unit is by microwave
Source, directional coupler, transmitting antenna, reception antenna, width phase detection module and unburned carbon in flue dust processing module composition；And emit
Antenna and reception antenna are opposite mounted on sample both sides；It is characterized in that, the equipment is using bypass sampling, with microwave measurement skill
Art measures the on-line checking of unburned carbon in flue dust and the equipment of calibration in thermal power plant's flue；Wherein directional coupler respectively with transmitting day
Line, the connection of width phase detection module；Reception antenna is connect with width phase detection module；And transmitting antenna and the opposite installation of reception antenna
On bypass sample cell both sides；Bypass sample cell connects isolating valve, calibration valve and blow down valve by four-way pipe respectively；Isolating valve, is by pipe
Road connect through upper mounting flange with sampling mouth, calibration valve and standard gray sample bottle connect and compose can on-line proving bypass sampling dress
It puts.
2. according to claim 1 can on-line proving bypass sampling type micro-wave survey unburned carbon in flue dust equipment, which is characterized in that
The upper mounting flange is fixed on mouth is sampled in flue inner wall.
3. according to claim 1 can on-line proving bypass sampling type micro-wave survey unburned carbon in flue dust equipment, which is characterized in that
The blow down valve connects compressed air valve and fluid valve respectively by three-way pipe, and fluid valve connects bypass sample by three-way pipe respectively
Quality control and ejector；Ejector is connect with lower mounting flange, and ash discharging hole is fixed in flue inner wall by lower mounting flange.
4. according to claim 1 can on-line proving bypass sampling type micro-wave survey unburned carbon in flue dust equipment, which is characterized in that
The bypass sample cell selects the quartz glass tube of wave transparent, dielectric loss 0.005 hereinafter, absorption very little to microwave signal,
The cross-sectional area of the quality control of sample bypass simultaneously should be more than the three times of Antenna aperture area.
5. according to claim 1 can on-line proving bypass sampling type micro-wave survey unburned carbon in flue dust equipment, which is characterized in that
Before the bypass sampling device need to be mounted on air preheater, bypass sampling device bypasses sample cell and fluidic cartridge by sampler
Put composition；Sampler takes out ash sample by fluidic device drainage from flue.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720828569.6U CN207502430U (en) | 2017-07-10 | 2017-07-10 | It is a kind of can on-line proving bypass sampling type micro-wave survey unburned carbon in flue dust equipment |
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| CN201720828569.6U CN207502430U (en) | 2017-07-10 | 2017-07-10 | It is a kind of can on-line proving bypass sampling type micro-wave survey unburned carbon in flue dust equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356612A (en) * | 2017-07-10 | 2017-11-17 | 华北电力大学 | Can on-line proving bypass sampling type micro-wave survey unburned carbon in flue dust device and method |
| CN112229823A (en) * | 2020-09-09 | 2021-01-15 | 昆明醋酸纤维有限公司 | Online real-time detection device and method for fly waste of tow production line |
| CN112461864A (en) * | 2020-10-16 | 2021-03-09 | 合肥联宝信息技术有限公司 | Microwave frequency signal penetration rate measuring system |
-
2017
- 2017-07-10 CN CN201720828569.6U patent/CN207502430U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356612A (en) * | 2017-07-10 | 2017-11-17 | 华北电力大学 | Can on-line proving bypass sampling type micro-wave survey unburned carbon in flue dust device and method |
| CN112229823A (en) * | 2020-09-09 | 2021-01-15 | 昆明醋酸纤维有限公司 | Online real-time detection device and method for fly waste of tow production line |
| CN112461864A (en) * | 2020-10-16 | 2021-03-09 | 合肥联宝信息技术有限公司 | Microwave frequency signal penetration rate measuring system |
| CN112461864B (en) * | 2020-10-16 | 2022-11-04 | 合肥联宝信息技术有限公司 | Microwave frequency signal penetration rate measuring system |
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