CN207096046U - A kind of low concentrations of particulates thing measuring instrument suitable for wet flue gas - Google Patents

A kind of low concentrations of particulates thing measuring instrument suitable for wet flue gas Download PDF

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Publication number
CN207096046U
CN207096046U CN201720923855.0U CN201720923855U CN207096046U CN 207096046 U CN207096046 U CN 207096046U CN 201720923855 U CN201720923855 U CN 201720923855U CN 207096046 U CN207096046 U CN 207096046U
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China
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test chamber
flue gas
sampling probe
blower fan
measuring instrument
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CN201720923855.0U
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张利军
吕子啸
闫兴钰
白慧宾
唐艳平
郭旭
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SINOGREEN ENVIRONMENTAL PROTECTION SCIENCE & TECHNOLOGY Co Ltd
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SINOGREEN ENVIRONMENTAL PROTECTION SCIENCE & TECHNOLOGY Co Ltd
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Abstract

The utility model overcomes the shortcomings of the prior art, there is provided a kind of low concentrations of particulates thing measuring instrument suitable for wet flue gas, measurement accuracy are high;In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model is:A kind of low concentrations of particulates thing measuring instrument suitable for wet flue gas, including rack, band heating sampling probe, test chamber, low concentration dust instrument sensor and jet pump, the band heating sampling probe is arranged in flue, and the band heating sampling probe is connected in the test chamber in rack by heat traced pipeline, heating module is provided with the test chamber, the low concentration dust instrument sensor is arranged on test chamber, for measuring the flue gas particles concentration gathered in test chamber, the jet pump is arranged on the bottom side of interior of equipment cabinet, for the flue gas with heating sampling probe collection to be pumped into test chamber;The utility model can be widely applied to particulate matter on-line monitoring field.

Description

A kind of low concentrations of particulates thing measuring instrument suitable for wet flue gas
Technical field
A kind of low concentrations of particulates thing measuring instrument suitable for wet flue gas of the utility model, belong to particulate matter on-line monitoring skill Art field.
Background technology
Scattering method smokemeter is conventional smoke detector device after conventional laser, and scattering method smokemeter measures after conventional laser Principle is using infrared laser as transmitting light source, when laser is radiated on dust, produces light scattering.In optical system and powder Under conditions of dirt property is certain, scattered light intensity is proportional to dust concentration, and then measurement is completed after calculating.
From engineering practice, arching pushing smokemeter is when smoke dust discharge concentration is higher after laser(More than 50mg/m3), it is Relatively good selection.But it is directed to domestic 30mg/m3Hereinafter, or even 5mg/m3Dust emission technical requirements, surveyed as online dust Device is measured, far can not reach technical requirements.Reason is as follows:
(1)The particle diameter and concentration of dust synchronously have dropped a lot, therefore laser reflection and the chance of refraction have dropped a lot, Appearance does not measure not come out, and does not have phenomena such as reflected light signal.
(2)Flue gas water content increases, and typically to account for more than 10%, even more high, laser is exposed on Mini-type water drop, can be produced Raw reflection and refraction, thus it is big by moisture interference factor, cause measurement inaccurate.
Utility model content
The utility model overcomes the shortcomings of the prior art, there is provided a kind of low concentration suitable for wet flue gas Grain thing measuring instrument, measurement accuracy are high.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model is:It is a kind of suitable for wet flue gas Low concentrations of particulates thing measuring instrument, including rack, band heating sampling probe, test chamber, low concentration dust instrument sensor and jet pump, The band heating sampling probe is arranged in flue, and band heating sampling probe is connected in rack by heat traced pipeline In test chamber, heating module is provided with the test chamber, the low concentration dust instrument sensor is arranged on test chamber, is used for The flue gas particles concentration of collection in test chamber is measured, the jet pump is arranged on the bottom side of interior of equipment cabinet, for will be with heating The flue gas of sampling probe collection is pumped into test chamber.
The inside bottom side of the rack is provided with blower fan, and the blower fan is located at below jet pump, and the blower fan is used to drive Dynamic jet pump work, air-breathing and exhaust in test chamber are realized by the blower fan rotating.
Frequency converter is provided with the interior of equipment cabinet side wall, the frequency converter electrically connects with blower fan, for controlling blower fan Rotating speed.
Magnetic valve is provided with the heat traced pipeline, the magnetic valve is used to control gas path on-off.
The test chamber with being provided with micro-pressure sensor with heating sampling probe junction, the micro-pressure sensor with Electrically connected between frequency converter, the rotating speed of control blower fan is coordinated with frequency converter, it is ensured that band heating sampling probe isokinetic sampling.
Flue adpting flange is provided with the band heating sampling probe, the flue adpting flange is used to adopt with heating Sample probe is fixed in flue.
The heating module of the test chamber maintains temperature >=100 DEG C of test chamber.
Be provided with blowback air interface on the outside of the laser lens of the low concentration dust instrument sensor, the blowback air interface with Fan outlet provides blowback for laser lens and protects gas by pipeline communication.
The utility model has an advantageous effect in that compared with prior art:The utility model is measured using extraction-type, is kept away Exempt from flue flow velocity fluctuation to have a negative impact to measurement, and using whole heating, eliminate vapor to caused by measurement not Profit influences, while uses forward scattering technology, realizes ultralow range particulate matter measurement.
Brief description of the drawings
The utility model is described further below in conjunction with the accompanying drawings.
Fig. 1 is structural representation of the present utility model.
Fig. 2 is schematic perspective view of the present utility model.
In figure:1 it is rack, 2 be band heating sampling probe, 3 be test chamber, 4 is low concentration dust instrument sensor, 5 to penetrate Stream pump, 6 be heat traced pipeline, 7 be blower fan, 8 be frequency converter, 9 be magnetic valve, 10 be micro-pressure sensor, 11 be flue connection method It is blue.
Embodiment
As shown in Figure 1 and Figure 2, a kind of low concentrations of particulates thing measuring instrument suitable for wet flue gas of the utility model, including machine Cabinet 1, band heating sampling probe 2, test chamber 3, low concentration dust instrument sensor 4 and jet pump 5, the band heat sampling probe 2 It is arranged in flue, and band heating sampling probe 2 is connected in the test chamber 3 in rack 1 by heat traced pipeline 6, it is described Heating module is provided with test chamber 3, the low concentration dust instrument sensor 4 is arranged on test chamber 3, for measuring test chamber The flue gas particles concentration of collection, the jet pump 5 are arranged on bottom side rack 1 inside in 3, for will be with heating sampling probe The flue gas of 2 collections is pumped into test chamber 3.
The inside bottom side of the rack 1 is provided with blower fan 7, and the blower fan 7 is located at the lower section of jet pump 5, and the blower fan 7 is used Worked in driving jet pump 5, air-breathing and exhaust in test chamber 3 are realized by the rotating of blower fan 7.
Frequency converter 8 is provided with the internal side wall of rack 1, the frequency converter 8 electrically connects with blower fan 7, for controlling wind The rotating speed of machine 7.
Magnetic valve 9 is provided with the heat traced pipeline 6, the magnetic valve 9 is used to control gas path on-off.
The test chamber 3 with heating sampling probe 2 junction with being provided with micro-pressure sensor 10, the micro-pressure-difference sensing Electrically connected between device 10 and frequency converter 8, the rotating speed of control blower fan 7 is coordinated with frequency converter 8, it is ensured that the band heating constant speed of sampling probe 2 Sampling.
Flue adpting flange 11 is provided with the band heating sampling probe 2, the flue adpting flange 11 is used for band Heating sampling probe 2 is fixed in flue.
The heating module of the test chamber 3 maintains the temperature of test chamber 3 to be set to 100 DEG C or 110 DEG C or 120 DEG C.
Blowback air interface, the blowback air interface are provided with the outside of the laser lens of the low concentration dust instrument sensor 4 With the air outlet of blower fan 7 by pipeline communication, provide blowback for laser lens and protect gas.
The utility model is monitored on-line using extraction-type particulate matter, for minimum discharge unit, the small-range of exploitation Low concentration wet flue gas smokemeter, cold aqueous or drop flue gas are subjected in situ extract and heated, by improving flue-gas temperature, is entered Row emission measurement, at the same it is relatively low in view of the dust concentration of minimum discharge unit, so selection small-range measuring unit, general quantity Journey is less than 50mg/m3
Operation principle of the present utility model is:Water droplet will be contained or droplet wet flue gas is extracted using jet pump, adopted Sample is popped one's head in and measuring chamber has heating function, and flue gas is warming up to more than dew-point temperature, is then dissipated before measuring chamber installs laser Method flue gas analysis unit is penetrated, is measured, flue gas is directly discharged into flue after sampling, that is, completes whole measurement process.
The course of work of the present utility model:The heating module of upper electric post-sampling probe and test chamber is begun to warm up, due to firm Upper electrical heating temperature is not up to the temperature sampled, and blower fan first purges to system pipeline, and system monitoring reaches to heating-up temperature After design temperature, electromagnetism valve events, flue gas sampling state being entered, sample aspiration is entered sampling feeler lever by negative pressure caused by jet pump, Finally arrive the measurement that measuring unit carries out dust concentration.From above establishing by cable the beginning, blower fan provides the protection gas of optical glass window always. Pressure, temperature and flow velocity of the system while sampling in monitoring process pipeline, to ensure that the measurement of system is accurate and stability. Default automatic back blow function, it is ensured that stopping state will not occur in the case of long-play for pipeline.System is also equipped with Full scale calibration function, daily measurement is facilitated to safeguard.
The utility model is to further adapt to new national standard GB13223-2011《Thermal power plant's Air Pollutant Emission mark It is accurate》And the technology upgrading carried out works with product renewal, scattering dust instrument is due to flue dust humidity, particulate matter grain after solving at present Measurement accuracy caused by the factors such as footpath is low, the big technological difficulties of measurement error.
The utility model uses integrated design, is only made up of band heating sampling probe and rack two parts, install convenient.
Each critical piece function of the utility model is as follows:
Band heating sampling probe:Stretch into flue, length can be customized according to flue diameter, carries heating function, will adopt into Gas heats, and using Stainless steel 316 material, improves antiseptic property of the probe under flue adverse circumstances.
Flue adpting flange:It will be fixed on heating sampling probe on flue, brick flue is fixed using expansion bolt mode, Metal flue is fixed using the method for welding.
Rack:Fan assembly, master reference, electric component and pipeline portions are placed, possess rainproof function, suitable for outdoor peace Dress.
Heat traced pipeline:Sample gas transmission is carried out, prevents sample gas from condensing to the cold, influences measurement result.
Magnetic valve:Gas path on-off is controlled, carries out the switching of sample states and blowback state.
Micro-pressure sensor:The micro-pressure-difference in pipeline is measured, and then calculates sample gas velocity.
Test chamber:For closed circular wall, heating function is carried, flange-interface can fix low concentration dust instrument sensor.
Low concentration dust instrument sensor:For core measuring unit, LASER Light Source launches diameter projected about 5mm laser beam, Dust granules produce scattering light when passing through laser beam, photodiode receives scattered light signal, is transformed into voltage signal, then pass through Series of computation, draw the concentration value of dust particle.
Frequency converter:Blower fan frequency of supply is controlled, jet pump is produced the suction that pressure does not wait, realizes isokinetic sampling.
Jet pump:Sampling apparatus, supplied by blower fan, produce suction after Venturi effect occurs, dust in flue is carried out Sampling.
Blower fan:Supplied to jet pump, there is provided blowback source of the gas, there is provided optical mirror slip protection air curtain source of the gas, power 1.75Kw, most Big flow 3.6m3/min.
Dust measurement sensor is core measuring unit in the utility model, and the wet flue gas containing water droplet or mist is utilized Jet pump is evacuated to test chamber, and by flue gas to more than 120 degree, i.e., flue-gas temperature is promoted to more than dew point, is installed in measuring chamber There is scattering method flue gas analysis unit before laser, LASER Light Source launches diameter projected about 5mm laser beam, and dust granules pass through laser Scattering light is produced during beam, photodiode receives scattered light signal, is transformed into voltage signal, then by series of computation, draw The concentration value of dust particle, the flue gas after sampling are directly discharged into flue, that is, complete whole measurement process.
Each critical piece function is as follows in dust measurement sensor:
Laser lens blowback air interface:6mm polytetrafluoroethylene (PTFE) tracheaes are connect, UNICOM's blower fan gas outlet, are provided for laser lens Gas is protected in blowback.
Protective cover:Protect coupling mirror optical fiber and two 4mm polytetrafluoroethylene (PTFE) tracheaes, while reserved light trapping mounting hole.
Tracheae and optical-fibre channel:304 stainless steel tubes, inside are two 4mm polytetrafluoroethylene (PTFE) tracheaes and the passage of optical fiber.
Laser channeling:Two elongated holes are provided with supporting plate component, make laser by the way that finally go directly light trapping.
Full scale calibration block:Inside there are two into 90 jiaos of speculum, change laser emission path, realize full scale calibration.
Electrical box:Gather equipped with parameter version, power panel, digiboard, analog board, laser module, photodiode module, 4mm Tetrafluoroethene tracheae adapter.
Circuit board:Power panel, digiboard, analog board composition, photodiode are welded on top center, complete from scattering light Series of computation process of the signal to particle concentration value.
Fibre-coupled mirrors:Laser light scattering signal is collected, focuses to optical fiber head.
Blowback air joint:It is arranged symmetrically, connects two 4mm polytetrafluoroethylene (PTFE) tracheaes, the biconvex eyeglass in coupling mirror is entered Row protection.
Photodiode:Complete conversion of the optical signal to voltage signal.
Electric interfaces:24V direct currents are provided for power panel, and transmits and calculates data to PLC control unit.
Original system has two blower fans, and big blower fan supplies for jet pump, and provides the protection gas of optical glass window, small blower fan Offer system blowback air, the scheme of small blower fan blowback, in addition to increasing cost, programme controlled complexity increase, complete machine goes out The probability of existing failure is also uprised, and by verifying repeatedly, blowback work can also be completed simultaneously by being found to be the big blower fan of jet pump supply Make, then change big fan connector design, cancel small blower fan.
Remaining each component function of the utility model is as follows:
Blower fan gas outlet:Connecting fan adapter,
Fan air inlet:Filter is connected, ensures the cleannes of blowback air.
System pipeline blowback air interface:12mmpu pipes are connected, blowback air is provided for system.
Blower fan adapter:Bottom is 2 cun of screw threads, connecting fan, and three mounting holes are arranged at top, respectively with jet pump, system Pipeline blowback air interface, optical mirror slip blowback air orifice.
Optical mirror slip blowback air interface:6mm polyfluortetraethylene pipes are connected, blowback is provided for laser lens and coupling mirror eyeglass Gas.
Band heating sampling probe mainly has two functions, flue gas sampling function and flue gas pre-add hot merit in the utility model Energy.Common sampling probe only has flue gas sampling function, is measured for the particulate matter of minimum discharge, low temperature wet flue gas, and cigarette temperature is more Vapor is hypersaturated state in 50 degrees centigrades, flue gas, contains a large amount of drops.Its drop composition contains substantial amounts of calcium and magnesium Ion and sulfate ion and calcium oxide solid content.
The concentration for the particulate matter that the utility model is related to is low, typically in 20mg/m3Hereinafter, many units are in 10mg/m3With Under.The composition and property of particulate matter are complicated, for liquid aerosol and solid aerosol and state are deposited, according to the newest revision in China Particulate matter measurement standard, it is desirable to which particulate matter measurement must just may be used in the solid particulate matter that more than 105 degree operating modes of flue gas are formed Think discharged particle, and then measure.
Band heating sampling probe is made up of three parts in the utility model, outer tube, band heating inner tube and air inlet pipe.Material is equal For 316 stainless steels, to improve corrosion resistance.
Air inlet pipe:It is fixed on outer tube, flue gas enters heating chamber by air inlet pipe, and the air inlet direction of air inlet pipe is adjustable, can It is arranged to 0 °, 90 °, 180 °, 270 °.
Band heating inner tube:Tube wall does infrared coating processing, to improve the efficiency of heating surface of the heat conducting pipe to inside smoke.Add Hot 200 DEG C of temperature, from normal temperature to about 10 minutes 200 DEG C of heat times, internal pre-buried temperature sensor, enter the monitoring of trip temperature And regulation and control.
Outer tube:One is welded with ring flange, is docked with mounting flange.Other end is installed by air inlet pipe.Band heating inner tube installation In in outer tube, outer tube serves protective effect.
Embodiment of the present utility model is explained in detail above in conjunction with accompanying drawing, but the utility model is not limited to Embodiment is stated, in those of ordinary skill in the art's possessed knowledge, the utility model aims can also not departed from On the premise of various changes can be made.

Claims (8)

  1. A kind of 1. low concentrations of particulates thing measuring instrument suitable for wet flue gas, it is characterised in that:Including rack(1), band heating adopt Sample is popped one's head in(2), test chamber(3), low concentration dust instrument sensor(4)And jet pump(5), the band heating sampling probe(2)If Put in flue, and band heating sampling probe(2)Pass through heat traced pipeline(6)It is connected to rack(1)Interior test chamber(3) It is interior, the test chamber(3)On be provided with heating module, the low concentration dust instrument sensor(4)It is arranged on test chamber(3)On, For measuring test chamber(3)The flue gas particles concentration of interior collection, the jet pump(5)It is arranged on rack(1)Internal bottom side, For will with heating sampling probe(2)The flue gas of collection is pumped into test chamber(3)It is interior.
  2. A kind of 2. low concentrations of particulates thing measuring instrument suitable for wet flue gas according to claim 1, it is characterised in that:Institute State rack(1)Inside bottom side be provided with blower fan(7), the blower fan(7)Positioned at jet pump(5)Lower section, and the blower fan(7)With In driving jet pump(5)Work, passes through the blower fan(7)Test chamber is realized in rotating(3)Interior air-breathing and exhaust.
  3. A kind of 3. low concentrations of particulates thing measuring instrument suitable for wet flue gas according to claim 2, it is characterised in that:Institute State rack(1)Frequency converter is provided with internal side wall(8), the frequency converter(8)With blower fan(7)Electrical connection, for controlling blower fan (7)Rotating speed.
  4. A kind of 4. low concentrations of particulates thing measuring instrument suitable for wet flue gas according to claim 3, it is characterised in that:Institute State heat traced pipeline(6)On be provided with magnetic valve(9), the magnetic valve(9)For controlling gas path on-off.
  5. A kind of 5. low concentrations of particulates thing measuring instrument suitable for wet flue gas according to claim 4, it is characterised in that:Institute State test chamber(3)Sampling probe is heated with band(2)Junction is provided with micro-pressure sensor(10), the micro-pressure sensor (10)With frequency converter(8)Between electrically connect, with frequency converter(8)Coordinate control blower fan(7)Rotating speed, it is ensured that band heating sampling probe (2)Isokinetic sampling.
  6. A kind of 6. low concentrations of particulates thing measuring instrument suitable for wet flue gas according to claim 5, it is characterised in that:Institute State band heating sampling probe(2)On be provided with flue adpting flange(11), the flue adpting flange(11)For will be with heating Sampling probe(2)It is fixed in flue.
  7. A kind of 7. low concentrations of particulates thing measuring instrument suitable for wet flue gas according to claim 6, it is characterised in that:Institute State test chamber(3)Heating module maintain test chamber(3)Temperature >=100 DEG C.
  8. A kind of 8. low concentrations of particulates thing measuring instrument suitable for wet flue gas according to claim 7, it is characterised in that:Institute State low concentration dust instrument sensor(4)Laser lens on the outside of be provided with blowback air interface, the blowback air interface and blower fan(7) Air outlet provides blowback for laser lens and protects gas by pipeline communication.
CN201720923855.0U 2017-07-27 2017-07-27 A kind of low concentrations of particulates thing measuring instrument suitable for wet flue gas Active CN207096046U (en)

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CN201720923855.0U CN207096046U (en) 2017-07-27 2017-07-27 A kind of low concentrations of particulates thing measuring instrument suitable for wet flue gas

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Application Number Priority Date Filing Date Title
CN201720923855.0U CN207096046U (en) 2017-07-27 2017-07-27 A kind of low concentrations of particulates thing measuring instrument suitable for wet flue gas

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113008749A (en) * 2021-03-17 2021-06-22 南京传积兴自动化科技有限公司 Ultra-low temperature formula smoke detection system of breathing in

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113008749A (en) * 2021-03-17 2021-06-22 南京传积兴自动化科技有限公司 Ultra-low temperature formula smoke detection system of breathing in

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