CN104697911A - Device and method for continuous online measurement of concentration of wet flue gas particles in coal-fired power plant - Google Patents
Device and method for continuous online measurement of concentration of wet flue gas particles in coal-fired power plant Download PDFInfo
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Abstract
The invention discloses a device for continuous online measurement of concentration of wet flue gas particles in a coal-fired power plant. The device comprises a heating cavity which is arranged in a flue, wherein a heating group is also arranged in the heating cavity; an air inlet and an air outlet are formed in the heating cavity; the air outlet is communicated with a diversion pipe; the diversion pipe is communicated with a measurement chamber; and a laser smokemeter is arranged in the measurement chamber and is also communicated with a wind sweeping unit through a pipeline. The heating cavity and the measurement chamber are directly arranged in the flue, so that the power of a draught fan in a flue gas duct of a power station is fully utilized; the flue gas directly enters the heating cavity to be heated and pretreated and then is measured in an unpowered in-situ heating manner; no extraction mode is adopted; high-power cyclone fan and jet pump and a corresponding control circuit in a traditional measurement device are omitted; the structure of the device is effectively simplified; equipment maintenance is facilitated; the flue gas flow rate in the flue is relatively large; and the measurement error caused by small sampling flow can be effectively reduced.
Description
Technical field
The present invention relates to a kind of coal-fired power plant flue gas measurement mechanism, in particular, the present invention relates generally to the device and method of the continuous on-line measurement of a kind of coal-fired power plant's wet flue gas particle concentration.
Background technology
In the recent period, along with the execution of " fossil-fuel power plant atmospheric pollutant emission standard GB13223-2011 ", on July 1st, 2014 rises, and all coal-fired boiler in thermal power plant soot emissions limit values all reach 30mg/m
3below, key area heat power plant boiler soot emissions limit value all reaches 20mg/m
3below.In September, 2014, National Development and Reform Committee, Bureau of Energy, Chinese Ministry of Environmental Protection's combined paper [2014] No. 2093 literary compositions are about printing and distributing " coal electricity energy-saving and emission-reduction upgrading and transformation action plan " (2014-2020) according to notice, and in the year two thousand twenty active service Thermal generation unit atmosphere pollution, soot emissions limit value will lower than 10mg/m
3.
Dust concentration technology measured by traditional generating plant is on flue, install laser optics smokemeter (also known as flue dust turbidimeter), the occasion that this technology mainly uses is dry flue gas, that is, in flue gas, water vapor to get off measurement in the operating mode of undersaturated condition (relative humidity is less than 100%), but under tackling current minimum discharge background be rich in slurry droplet, there is the problem that numerical fluctuations is large, error is large in the supersaturation flue gas measurement of water droplet, cause using.For the measuring technique of above-mentioned operating mode, in the world, several producers are had to provide particle concentration line Measurement Technique for wet flue gas.The well-known product having three companies, be respectively the special dust instrument of D-R820F wet flue gas of German Durag company, the STACK 181WS wet flue gas smokemeter of PCME company of Britain, the FWE200 high-humidity gas fume smokemeter of Germany SICK|MAHAK (Xi Kemai Haake), be described as follows: German Durag company (Chinese Du draws leather) product type D-R820F, name of product is the special dust instrument of wet flue gas, its ultimate principle for extracting flue gas with constant speed tracking mode insulation companion heat from flue, by flue gas, reduce relative humidity, then equal proportion dilution (its dilution ratio is 1:1) is carried out with part heat drying dry air, reduce moisture in flue gas, thus reduction flue gas dew point, then carry out measurement dust concentration by scattering method before laser, finally calculate the concentration of emission of actual particle in flue gas in conjunction with mixed gas dilution ratio.Its system consists of: sampling head and measuring chamber, ejector and rotational flow fan, dilution air, power supply and display unit, mounting flange and related accessories.
The product STACK 181WS of Britain PCME, its fundamental measurement principle is the inserting tube of a use resistant material, flue gas to be measured is extracted from flue, then enter a cartridge heater, flue gas is heated up, improve flue gas relative humidity, dry flue gas after heating, enter measuring chamber, measuring chamber is equipped with the laser analysis instrument of front scattering method, measures.Gas after measurement enters ejector, is back to again and extracts flue gas recurrent canal on the same flange of feeler lever.Complete the measuring process of flue gas particle substrate concentration like this.
Germany SICK | the FWE200 of MAHAK (Xi Kemai Haake), wet flue gas emission measurement instrument, its principle of work is extracted away from flue (or chimney) by wet flue gas, enter circular cartridge heater, flue gas is heated up after heating atomization, flue-gas temperature exceeds more than dew point, then enters measuring chamber and measures.Flue gas after measurement is back in flue.In order to prevent the water droplet blocking pipe after flue gas condensing or flow into rear portion heating chamber, system adopts high-order layout, smoke sampling flange lower disposed, and slightly to having a down dip, makes flue gas condensing water from flowing to flue.In FWE200 extraction process, flue gas after sampling is not diluted.
By the end of so far, in the world, known wet flue gas measuring concentration of granules in certain online technique is all that extraction-type adds thermal measurement method substantially.If segmented further again, be respectively dilution heating extraction method and non-diluted heating extraction method.The common cardinal principle of two kinds of methods is by fume extraction smoke outlet flue, then flue gas is warming up to more than dew point, generally at 100 degree to about 120 degree, then measure.Its shortcoming is as follows: one is that equipment is huge and clumsy, is not easy very much high-altitude and installs.Because be furnished with huge extracting device and firing equipment, make measuring system bulky and weight is large, because this equipment is arranged in chimney absolute altitude more than 60 meters or flue absolute altitude more than 20 meters, be not easy very much installation more.For the D-R820F of Du Lage, the weight of its sampling unit is 40kg, the weight of measuring unit is the weight 30kg of the sampling head unit of the Stack 181WS of 90kg. PCME, measurement and control module weight are the FEW200 sampling head weight 20kg of 120kg. SICKMAHAK, control weight at about 80kg.Two is that sample flow is little, and low particle concentration is difficult to measure or measuring process instability.Extraction-type, owing to receiving ejector power limit, extracts flow general less, extracts and easily occurs that sampling is uneven, thus cause larger measuring error at low concentration.Wherein Du draws the extraction speed of the D-R820F of leather to be 100l/min (liter/min) to 150l/min (liter/min), the Stack 181ws of PCME extracts speed in 100l/min (liter/min) left and right, and the extraction speed of the FEW200 of SickMAHAK is at about 100l/min.Because under current generating plant operating mode, the absolute value of dust concentration is very low, substantially at 10mg/m
3left and right, this kind of extraction flow, in the unit interval, sample drawn gas absolute magnitude is less than normal, and sample gas representativeness is bad, easily causes measuring error.Three is that plant maintenance workload is large, slewing and opertaing device more, need two high-power rotational flow fan long periods and continuously run, equipment failure and maintenance larger.Four is that non-probe heating means carry out sampling (FWE200 as STACK 181WS and SICK of PCME), condensate water is there is at sampling pipe, condensate water has suction-operated to soot dust granule thing, simultaneously condensate water when condensing more containing flue dust condensate water directly flow automatically and be back to flue, the loss of the measured particle caused, thus cause measuring error.Thus be necessary to carry out studying and improving for the structure of the flue gas particles apparatus for measuring concentration of coal-fired power plant.
Summary of the invention
An object of the present invention is for above-mentioned deficiency, the device of the continuous on-line measurement of a kind of coal-fired power plant's wet flue gas particle concentration is provided, large to expect to solve the little measuring error caused of sample flow in prior art, huge being not easy to of equipment volume is installed, complex structure maintenance cost is high, and easily producing condensate water absorption soot dust granule thing at sampling passage affects the technical matterss such as measuring accuracy.
For solving above-mentioned technical matters, the present invention by the following technical solutions:
One aspect of the present invention provides the device of the continuous on-line measurement of a kind of coal-fired power plant's wet flue gas particle concentration, and described device comprises the heating cavity for being arranged in flue, and the inside of described heating cavity is also provided with heating group; Described heating cavity is provided with air intake opening and gas outlet, described gas outlet is connected with mozzle, described mozzle is connected with measuring chamber, laser smokemeter is installed in described measuring chamber, described laser smokemeter also by pipeline with sweep wind unit and be connected, for be sent into laser smokemeter by pipeline purge wind by sweeping wind unit.
As preferably, further technical scheme is: the inside of described heating cavity is also provided with thermometric bar, described thermometric bar and heating group access electric cabinet in the lump, for being controlled the Current Temperatures of heating group by electric cabinet, and by measuring the temperature of flue gas to be measured in heating cavity.
Further technical scheme is: described heating group is the separate heater of at least three groups with fin, and described well heater is arranged on the bottom of heating cavity by flange.
Further technical scheme is: described heating cavity is the structure of double layer hollow, and the inwall of described heating cavity is equipped with polytetrafluorethylecoatings coatings.
Further technical scheme is: described heating cavity entirety is in vertical drum-shaped, and the side of drum-shaped heating cavity is all located in described air intake opening and gas outlet, and described air intake opening and gas outlet the installation direction of heating cavity side and the axis of flue consistent, described air intake opening is near the top of heating cavity, and described gas outlet is near the bottom of heating cavity.
Further technical scheme is: described air intake opening and gas outlet are all arranged on heating cavity by external thread, and described air intake opening is also provided with regulating device, for regulating the caliber size of air intake opening; The bore of described air intake opening is greater than gas outlet.
Further technical scheme is: described laser smokemeter is also provided with heating arrangement with sweeping on pipeline that wind unit is connected.
Further technical scheme is: also comprise the pitot tube for being arranged in flue in described device, described pitot tube is placed in the rear end of measuring chamber, and keeps gap between described pitot tube and measuring chamber; Described pitot tube access host cabinet, for measuring the flue gas flow rate in current flue; Described mainframe also by sweeping wind unit access laser smokemeter, for completing measurement data acquisition, is preserved and the inquiry of historical data.
The present invention provides the method for the continuous on-line measurement of a kind of coal-fired power plant's wet flue gas particle concentration on the other hand, described method adopts above-mentioned device, and comprise the steps: that the flue gas flowed in flue is entered the inside of heating cavity by the air intake opening of heating cavity, discharged by gas outlet by the flue gas after the heating of heating group; The heat smoke that adds of being discharged by gas outlet enters measuring chamber by mozzle, adds heat smoke in mozzle, is guided to advection state; The smoke signal added in heat smoke is converted into current signal transfer to mainframe by the laser smokemeter in measuring chamber, and mainframe completes measurement data acquisition, preserves and the inquiry of historical data; Sweep wind unit to continue to send into laser smokemeter to purge wind, make laser probe and receiving unit keep clean.
As preferably, further technical scheme is: the temperature of the flue gas after described heating cavity heating is greater than 120 degrees Celsius, described in sweep wind unit and send into laser smokemeter the temperature purging wind and be greater than 100 degrees Celsius; Flue gas in described flue flows under power plant boiler carries the dynamic action of induced draft fan in flue.
Compared with prior art, one of beneficial effect of the present invention is: by being directly arranged in flue by heating cavity and measuring chamber, make full use of the power of induced draft fan in cigarette air channel, generating plant, adopt unpowered, In Situ Heating mode that flue gas is directly entered in heating cavity to measure after heating pretreatment, do not adopt extraction-type mode, eliminate the control circuit of powerful rotational flow fan in typical measuring arrangements and ejector and correspondence, effectively simplify the structure of device, facilitate plant maintenance; And flue gas flow in flue is comparatively large, also can effectively reduce because the little measuring error brought of sample flow; The structure of the device of the simultaneously continuous on-line measurement of a kind of coal-fired power plant's wet flue gas particle concentration provided by the present invention is simple, and measuring method is easy, is suitable for being arranged in the flue of all kinds of coal-fired power plant and similar site using, and range of application is wide.
Accompanying drawing explanation
Fig. 1 is the structural representation for illustration of one embodiment of the invention;
Fig. 2 is for illustration of the heating cavity structural representation in another embodiment of the present invention;
Fig. 3 is that the A of Fig. 2 is to schematic diagram;
Fig. 4 is for illustration of the heating group structural representation in another embodiment of the present invention;
Fig. 5 is for illustration of the draft tube structure schematic diagram in another embodiment of the present invention;
Fig. 6 is for illustration of the first stage wind speed match curve in another embodiment of the present invention;
Fig. 7 is for illustration of the subordinate phase wind speed match curve in another embodiment of the present invention;
In figure, 1 being flue, 2 being heating cavity, 21 be air intake opening, 22 be gas outlet, 3 be heating group, 31 be fin, 32 be well heater, 33 be flange, 4 be mozzle, 5 be measuring chamber, 6 be laser smokemeter, 7 being thermometric bar for sweeping wind unit, 8,9 be electric cabinet, 10 be mainframe, 11 be base plate, 12 for pitot tube.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further elaborated.
Shown in figure 1, one embodiment of the present of invention are devices of the continuous on-line measurement of a kind of coal-fired power plant's wet flue gas particle concentration, and this device comprises the heating cavity 2 for being arranged in flue 1, and the inside of heating cavity 2 is also provided with heating group 3; This heating cavity 2 is provided with air intake opening 21 and gas outlet 22, and gas outlet 22 is connected with mozzle 4, mozzle 4 is then connected with measuring chamber 5, also in measuring chamber 5, laser smokemeter 6 need be installed simultaneously, this laser smokemeter 6 also by pipeline with sweep wind unit 7 and be connected, for sending into purging wind by pipeline to laser smokemeter 6 by sweeping wind unit 7; Prevent glass mirror to be stained with dust, impact is measured, and therefore will purge from a small amount of air at laser probe and receiving unit, keeps eyeglass to clean.
Above-mentioned laser smokemeter 6 can adopt front scattering method laser smokemeter, refer to that laser instrument sends light particle in flue gas, light wave is scattered, diffuse lightwave direction is divided into three directions, first direction is light wave scattering backward, second direction is to diagonally forward scattering, and the 3rd part is to both sides scattering.Wherein, to detect analyser that forward scattering light wave is receiving end front scattering method laser smokemeter, front scattering method laser dust monitor is also.Front scattering method laser dust monitor is generally used for and measures dry flue gas, humidity is low and dust concentration is low (can measure 0 to 5mg/m
3) place, simultaneously measure light path extremely short.The front scattering method laser smokemeter adopted in the present invention is buying parts, market can be selected front scattering method dust instrument all can use.
In the present embodiment, by directly heating cavity 2 and measuring chamber 5 being arranged in flue, make full use of the power of induced draft fan in cigarette air channel, generating plant, adopt In Situ Heating mode that flue gas is directly entered in heating cavity 2 to measure after heating pretreatment, do not adopt extraction-type mode, eliminate the control circuit of powerful rotational flow fan in typical measuring arrangements and ejector and correspondence, effectively simplify the structure of device, facilitate plant maintenance; And flue gas flow in flue is comparatively large, also can effectively reduce the measuring error brought because sample flow is little;
Go out as shown in Figure 1, in another embodiment of the invention, for effectively measuring the temperature in above-mentioned heating chamber, also in the inside of heating cavity 2, thermometric bar 8 can be installed, and this thermometric bar 8 is accessed electric cabinet 9 in the lump with heating group 3, for being controlled the Current Temperatures of heating group 3 by electric cabinet 9, and by measuring the temperature of flue gas to be measured in heating cavity 2; The thermometric bar 8 adopted in the present embodiment can adopt long rod type thermopair.
Shown in figure 2, according to another embodiment of the present invention, for promoting the heat insulation effect of heating cavity 2, above-mentioned heating cavity 2 can be arranged the structure of double layer hollow, by air heat insulation between the two-ply of hollow, preventing internal heat to scatter and disappear; Simultaneously also for preventing particle from adhering to and dust stratification, promoting corrosion resistance, also can be equipped with Teflon on the inwall of heating cavity 2, i.e. polytetrafluorethylecoatings coatings.
Shown in composition graphs 3, further, above-mentioned heating cavity 2 is preferably overall in vertical drum-shaped, preferred employing 316L stainless steel is processed into, and be arranged on base plate 11, thus make air intake opening 21 and gas outlet 22 all be located at the side of drum-shaped heating cavity 2, what is more important, air intake opening 21 and gas outlet 22 the installation direction of heating cavity 2 side and the axis of flue 1 consistent, and, air intake opening 21 can near the top of heating cavity 2, gas outlet 22 is near the bottom of heating cavity 2, and then can to ensure in flue 1 that the air of flowing can enter in heating cavity 1 smoothly and heat.More preferably, aforementioned air intake opening 21 is all arranged on heating cavity 2 by external thread with gas outlet 22, also can set up regulating device on air intake opening 21, is regulated the caliber size of air intake opening 21 by this regulating device; Make the bore of air intake opening 21 be greater than gas outlet 22, and then ensure the flow velocity of flue gas after heating in mozzle 4; Air intake opening 21 can be processed into a trumpet-shaped structure simultaneously.
As shown in Figure 5, it preferably adopts internal diameter 50mm to the structure of above-mentioned mozzle 4, and the material of external diameter 60mm is the straight hollow steel pipe of 316L, and centre position is provided with flue-gas temperature measuring point to be measured.Main Function is by gas flow guiding to advection state, reduces turbulent flow and flow-disturbing; The inside surface of mozzle 4 also can spray teflon coatings.
Shown in figure 4, for promoting the efficiency of heating in heating chamber 2, and promote the thermal diffusivity of heating group 3, meet flue gas to stagnate at heating cavity and namely completed heating to 1.5 seconds in 0.5 second, can at least three groups adopted with the separate heater 32 of fin 31 as above-mentioned heating group 3, and well heater 32 is being arranged on the bottom of heating cavity 2 by flange 33.Fin 31 on well heater 32 can increase the surface of contact of well heater and flue gas, helps heat to distribute; And each well heater 32 is all relatively independent, under normal conditions, can put into operation by two well heaters 32, a well heater 32 is for subsequent use, and these 3 groups can also put into operation separately according to concrete operating mode.In addition, aforesaid fin 31 and well heater 32 outside surface also can spray teflon coatings.
Shown in Fig. 1, on the other hand, inventor also finds in test, because what sweep that wind unit 7 sends into laser smokemeter 6 is normal temperature air, if run into high-temperature flue gas, mix, gas can be lowered the temperature, meeting condensation again, forms water smoke or fog, and impact is measured; Therefore be used in an embodiment being more preferably of technical solution problem in the present invention, also can set up heating arrangement 8 at laser smokemeter 6 with sweeping on pipeline that wind unit 7 is connected, by this heating arrangement 8, purging air is heated to more than 100 degrees Celsius, thus avoids the formation of water smoke or fog.
Above-mentioned sweep in wind unit 7 to comprise sweep blower fan and control module, ensure that sweeping blower fan normally runs by control module, and running status can be controlled.
Still with reference to shown in figure 1, for measuring the flow velocity of current flue gas in flue, also can set up the pitot tube 12 for being arranged in flue 1 in device in the above-described embodiments, and pitot tube 12 is placed in the rear end of measuring chamber 5, and make to keep gap between pitot tube 12 and measuring chamber 5; Again by pitot tube 12 access host cabinet 10, for measuring the flue gas flow rate in current flue 1; More specifically, above-mentioned mainframe 10 also accesses laser smokemeter 6 by sweeping wind unit 7, for completing measurement data acquisition, preserves and the inquiry of historical data.
Shown in figure 1, an alternative embodiment of the invention is the method for the continuous on-line measurement of a kind of coal-fired power plant's wet flue gas particle concentration, and the method adopts the device in any one embodiment above-mentioned, comprises and be preferably as follows step performing:
In step 1, flue 1, the flue gas of flowing is entered the inside of heating cavity 2 by the air intake opening 21 of heating cavity 2, is discharged by gas outlet 22 by the flue gas after heating group 3 heats;
Step 2, the heat smoke that adds of being discharged by gas outlet 22 enter measuring chamber 5 by mozzle 4, add heat smoke and be guided to advection state in mozzle 4;
The smoke signal added in heat smoke is converted into current signal transfer to mainframe 10 by the laser smokemeter 6 in step 3, measuring chamber 5, and mainframe 10 completes measurement data acquisition, preserves and the inquiry of historical data;
Step 4, sweep wind unit 7 and continue to send into laser smokemeter 6 to purge wind, make laser probe and receiving unit keep clean.
As mentioned here above, group method of the present invention is summarized as scattering flue dust On-line Measuring Method after original position installation, non-extraction, heated type, laser.
In the methods described above, preferably parameter is: the temperature of the flue gas after described heating cavity 2 heats is greater than 120 degrees Celsius, sweeps wind unit 7 and sends into laser smokemeter 6 temperature purging wind and be greater than 100 degrees Celsius; And the flue gas in flue 1 flows carry the dynamic action of induced draft fan at power plant boiler under in flue 1.
Device according to the above embodiments, inventor has carried out wind tunnel test to it, specific as follows:
Test objective: the inlet flue gas flow velocity of test smoke sampling pretreatment unit (comprising air intake opening, heating cavity, well heater, mozzle) and Data Matching between exiting flue gas flow velocity and wind-tunnel gas flow rate and comformity relation, determine whether isokinetic sampling.Concrete test method is as follows:
At smoke sampling pretreatment unit entrance, an air speed measuring apparatus (pitot tube differential pressure type) is installed, in an outlet installation air speed measuring apparatus (pitot tube differential pressure type).Smoke sampling pretreatment unit gas diversion tube arranges a temperature point (PT100), measures Outlet Gas Temperature.
After performance of wind tunnel verification, model machine is mounted to wind-tunnel mouth, then by the speed progressively raising speed of wind tunnel speed by about 2 meters, is first measurement point with 4 meter per seconds, observes inlet velocity and air outlet velocity, after wind speed readout stablizes 2 minutes, reading.Then carry out progressively raising speed with the ladder increasing by 2 meter per seconds, and record related data.
Two stages are divided to test:
First stage: normal room temperature (about 25 degrees Celsius) situation entrance, air outlet velocity match test
Subordinate phase: under heated condition, entrance, air outlet velocity match test
First stage result data is shown in form 1
First stage wind speed match curve is shown in Fig. 6, and subordinate phase wind speed match curve is shown in Fig. 7.
Experiment results proved: this PM prototype model in normal temperature situation, wind tunnel speed 4 meters within the scope of 30 meters, diversion chamber's air outlet velocity and flue airspeed deviation ratio maximum-0.3%, minimum-0.01%.In gas-heated to 150 degree Celsius situation, its diversion chamber's outlet gas velocity wind-tunnel flow velocity its velocity deviation rate that is consistent can be less than 0.4%, minimum-0.01%.Overall sample rate deviation ratio control 0.5%. meets isokinetic sampling's requirement completely.
Than that described above, also it should be noted that spoken of in this manual " embodiment ", " another embodiment ", " embodiment " etc., refer to the specific features, structure or the feature that describe in conjunction with this embodiment and be included at least one embodiment of the application's generality description.Multiple place occurs that statement of the same race is not necessarily refer to same embodiment in the description.Furthermore, when describing specific features, structure or a feature in conjunction with any embodiment, what advocate is also fall within the scope of the invention to realize this feature, structure or feature in conjunction with other embodiments.
Although with reference to multiple explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and embodiment, these amendments and embodiment will drop within spirit disclosed in the present application and spirit.More particularly, in the scope of, accompanying drawing open in the application and claim, multiple modification and improvement can be carried out to the building block of subject combination layout and/or layout.Except the modification of carrying out building block and/or layout is with except improvement, to those skilled in the art, other purposes also will be obvious.
Claims (10)
1. a device for the continuous on-line measurement of coal-fired power plant's wet flue gas particle concentration, is characterized in that: described device comprises the heating cavity (2) for being arranged in flue (1), and the inside of described heating cavity (2) is also provided with heating group (3); Described heating cavity (2) is provided with air intake opening (21) and gas outlet (22), described gas outlet (22) is connected with mozzle (4), described mozzle (4) is connected with measuring chamber (5), laser smokemeter (6) is installed in described measuring chamber (5), described laser smokemeter (6) also by pipeline with sweep wind unit (7) and be connected, for be sent into laser smokemeter (6) by pipeline purge wind by sweeping wind unit (7).
2. the device of the continuous on-line measurement of coal-fired power plant's wet flue gas particle concentration according to claim 1, it is characterized in that: the inside of described heating cavity (2) is also provided with thermometric bar (8), described thermometric bar (8) and heating group (3) access electric cabinet (9) in the lump, for being controlled the Current Temperatures of heating group (3) by electric cabinet (9), and by measuring the temperature of flue gas to be measured in heating cavity (2).
3. the device of the continuous on-line measurement of coal-fired power plant's wet flue gas particle concentration according to claim 1 and 2, it is characterized in that: described heating group (3) is the separate heater (32) of at least three groups with fin (31), and described well heater (32) is arranged on the bottom of heating cavity (2) by flange (33).
4. the device of the continuous on-line measurement of coal-fired power plant's wet flue gas particle concentration according to claim 1, it is characterized in that: the structure that described heating cavity (2) is double layer hollow, and the inwall of described heating cavity (2) is equipped with polytetrafluorethylecoatings coatings.
5. the device of the continuous on-line measurement of coal-fired power plant's wet flue gas particle concentration according to claim 1 or 4, it is characterized in that: described heating cavity (2) entirety is in vertical drum-shaped, and the side of drum-shaped heating cavity (2) is all located in described air intake opening (21) and gas outlet (22), and the axis of installation direction in heating cavity (2) side of described air intake opening (21) and gas outlet (22) and flue (1) is consistent, described air intake opening (21) is near the top of heating cavity (2), described gas outlet (22) is near the bottom of heating cavity (2).
6. the device of the continuous on-line measurement of coal-fired power plant's wet flue gas particle concentration according to claim 1, it is characterized in that: described air intake opening (21) and gas outlet (22) are all arranged on heating cavity (2) by external thread, and described air intake opening (21) is also provided with regulating device, for regulating the caliber size of air intake opening (21); The bore of described air intake opening (21) is greater than gas outlet (22).
7. the device of the continuous on-line measurement of coal-fired power plant's wet flue gas particle concentration according to claim 1, is characterized in that: described laser smokemeter (6) is also provided with heating arrangement (8) with sweeping on pipeline that wind unit (7) is connected.
8. the device of the continuous on-line measurement of coal-fired power plant's wet flue gas particle concentration according to claim 1, it is characterized in that: in described device, also comprise the pitot tube (12) for being arranged in flue (1), described pitot tube (12) is placed in the rear end of measuring chamber (5), and keeps gap between described pitot tube (12) and measuring chamber (5); Described pitot tube (12) access host cabinet (10), for measuring the flue gas flow rate in current flue (1); Described mainframe (10), also by sweeping wind unit (7) access laser smokemeter (6), for completing measurement data acquisition, is preserved and the inquiry of historical data.
9. a method for the continuous on-line measurement of coal-fired power plant's wet flue gas particle concentration, is characterized in that described method adopts the device described in claim 1 to 8 any one, comprises the steps:
In flue (1), the flue gas of flowing is entered the inside of heating cavity (2) by the air intake opening (21) of heating cavity (2), is discharged by gas outlet (22) by the flue gas after heating group (3) heating;
The heat smoke that adds of being discharged by gas outlet (22) enters measuring chamber (5) by mozzle (4), adds heat smoke and be guided to advection state in mozzle (4);
The smoke signal added in heat smoke is converted into current signal transfer to mainframe (10) by the laser smokemeter (6) in measuring chamber (5), and mainframe (10) completes measurement data acquisition, preserves and the inquiry of historical data;
Sweep wind unit (7) to continue to send into laser smokemeter (6) to purge wind, make laser probe and receiving unit keep clean.
10. the method for the continuous on-line measurement of coal-fired power plant's wet flue gas particle concentration according to claim 1, it is characterized in that: the temperature of flue gas after described heating cavity (2) heating is greater than 120 degrees Celsius, described in sweep wind unit (7) and send into laser smokemeter (6) temperature purging wind and be greater than 100 degrees Celsius; Flue gas in described flue (1) flows carry the dynamic action of induced draft fan at power plant boiler under in flue (1).
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| CN105606410A (en) * | 2016-01-25 | 2016-05-25 | 徐海慧 | Novel sampling detection type thermal power generation boiler |
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| CN106018002A (en) * | 2016-05-17 | 2016-10-12 | 南京友智科技有限公司 | Matrix type mixed constant-speed sampling device |
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