CN105300744B - A kind of system of coal steam-electric plant smoke NO and mercury sampling and detection simultaneously - Google Patents
A kind of system of coal steam-electric plant smoke NO and mercury sampling and detection simultaneously Download PDFInfo
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- CN105300744B CN105300744B CN201510769786.8A CN201510769786A CN105300744B CN 105300744 B CN105300744 B CN 105300744B CN 201510769786 A CN201510769786 A CN 201510769786A CN 105300744 B CN105300744 B CN 105300744B
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Abstract
A kind of system of coal steam-electric plant smoke NO and mercury sampling and detection simultaneously, including offline hg determining device and for stretching into the sampling detection gun in flue, the flue gas pipeline of sampling detection gun is several independently arranged quartzy pipelines, the outlet of quartzy pipeline is connected with flue gas ash removal, deacidification, dehumidification device, volume control device and NO detectors successively, and volume control device and NO detectors are connected with computer；It there also is provided the heating layer for making sampling detection gun maintain 120 DEG C or more in the inner walls of sampling detection gun, activated carbon adsorption pipe is installed on every quartzy pipeline, adsorbent is filled in activated carbon adsorption pipe, adsorbent is according to flue gas by being sequentially divided into the mercury oxide trapping layer that adsorbent is KCl and the Elemental Mercury adsorption layer that adsorbent is mercury control activated carbon.The present invention can be achieved at the same time in the sampling and detection of two kinds of pollutants of same sampled point NO and mercury in power-plant flue gas, and can also realize flow Parallel Sampling and Constant flow sample, and testing result is mutually calibrated.
Description
Technical field
The present invention relates to a kind of environment measuring sample devices, and in particular to a kind of coal steam-electric plant smoke NO and mercury sample simultaneously and
The system of detection.
Background technology
Coal fire discharged mercury is a kind of hypertoxic pollutant, in mercury emissions to air, will result in serious harm.Mercury is
A kind of neurotoxin can be accumulated in cerebral tissue, and human motion imbalance, aphasis etc. are caused.Coal steam-electric plant smoke is de-
While nitre, dedusting and desulfurization, the effect of cooperation-removal can be generated to mercury.European Union《The best practicable technology of large-scale burner
Reference paper》It is recommended that the technology path using high-effective dust-removing, flue gas desulfurization and denitration Collaborative Control is paid the utmost attention in the removing of mercury.
SCR technology (SCR techniques) has become the mainstream technology of Chinese thermal power plant's denitration.According to middle Electricity Federation
The annual coal steam-electric plant smoke Denitration Industry presentation of information in the 2012 of publication, newly puts into operation coal steam-electric plant smoke denitration unit capacity about in 2012
90000000 kilowatts, wherein the denitration machine that puts into operation for the year is accounted for using the denitration unit capacity of SCR technology (SCR techniques)
The 98% of group total capacity.By the end of the year 2012, the coal steam-electric plant smoke denitration unit total capacity that put into operation is more than 2.3 hundred million kilowatts, is accounted for complete
The 28% of state's active service fired power generating unit capacity, and according to the legal requirement of country, predict denitration on July 1 unit popularity rate in 2014
Reach 80% or more.
Existing SCR facilities are based oneself upon, seeks mercury efficient oxidation in SCR to remove, to be achieved at low cost mercury removal, is
The research direction of one suitable current national conditions in China.Under the premise of not influencing or improving denitration efficiency, filtering out can efficient oxygen
Change the SCR catalyst activity component and preparation method of mercury, while the cost of catalyst can be reduced.
From the point of view of a variety of materials in denitrating technique and the cost consumption of the energy, reducing agent accounts for about the 21% of totle drilling cost, catalysis
Agent accounts for the 40% of totle drilling cost, remaining is power consumption, water consume, maintenance of equipment and cost of labor etc..It can be seen that the exploitation of catalyst is
It reduces cost and improves the key of denitration efficiency.Although vanadia-based SCR catalysts have been carried out commercial Application, there are still some for it
Defect, for example specific surface area is relatively low, temperature window is relatively narrow, V2O5Have severe toxicity, rely on the oxidation efficiency of mercury HCl and by SOx and
NH3Inhibition etc..It is therefore desirable to study the Novel SCR catalyst for these disadvantages that can overcome business SCR catalyst.
In order to study Novel SCR catalyst to the oxidation removal efficiency of mercury and to the reduction efficiency of NO, finally develop both
NO can efficiently be restored and the SCR catalyst of energy efficient oxidation mercury, to realize such goal in research, the sampling and detection of mercury and NO
It is an important underlying issue.A set of accurate, credible, inexpensive mercury and NO samplings and monitoring system are only established, to SCR
NO, mercury before and after denitrification apparatus in flue gas are sampled and are measured, and the distribution using NO, mercury when different SCR catalysts is found out
Rule can just illustrate the influence of different active components and preparation method to catalyst denitration performance, demercuration performance；Illustrate difference
Operation temperature, air speed ratio, HCl, O2、SO2、NH3Etc. influence of the factors to mercury oxidation and removing.Finally is not influencing or improving
Under the premise of denitration efficiency, filters out and remain to efficient oxidation mercury, the lower SCR catalyst activity group of cost in the presence of a harsh environment
Point and preparation method.
But the system that in the prior art, only NO in flue gas or mercury are individually sampled and detected, can there are no developing
It realizes the system that NO and mercury are sampled and detected simultaneously, causes sampling and testing cost high.Simultaneously because can not be taken to same
Sampling point detects NO and mercury simultaneously, and the mercury and NO concentration values caused is not same sampled point, this has seriously affected NO and mercury
Representativeness, repeatability and the efficiency of sampling and detection.In addition, the adsorbent for acquiring mercury in flue gas is activated carbon, and ability
Field technique personnel think that activated carbon has suction-operated to NO, this is also largely constrained to NO in flue gas and mercury simultaneously
The development of the system of sampling and detection.
Invention content
It is an object of the invention to propose the system of a kind of coal steam-electric plant smoke NO and mercury while sampling and detection, the system
The sampling and detection that can be achieved at the same time two kinds of pollutants of NO and mercury in power-plant flue gas, can be with division aspect when being sampled to mercury
Trapping, and can also realize flow Parallel Sampling and Constant flow sample, testing result is mutually calibrated.
In order to achieve the above object, the technical solution adopted by the present invention is：Including offline hg determining device and for stretching into
Sampling detection gun in flue, the flue gas pipeline of sampling detection gun are several independently arranged quartzy pipelines, every quartzy pipeline
Outlet is connected with flue gas ash removal, deacidification, dehumidification device, volume control device and NO detectors successively, volume control device
It is connected with for flow detection, data monitoring, record and the computer of processing with NO detectors；Wherein, the inner wall of sampling detection gun
On there also is provided the heating layer for making sampling detection gun maintain 120 DEG C or more, activated carbon adsorption pipe is installed on every quartzy pipeline,
Adsorbent is filled in activated carbon adsorption pipe, adsorbent is adsorbed according to flue gas by being sequentially divided into mercury oxide trapping layer and Elemental Mercury
The adsorbent of layer, mercury oxide trapping layer is KCl, and the adsorbent of Elemental Mercury adsorption layer is mercury control activated carbon.
It is additionally provided with mercury oxide penetrated bed, mercury oxide trapping layer between the mercury oxide trapping layer and Elemental Mercury adsorption layer
Front end is provided with sour gas removal layer, and the rear end of Elemental Mercury adsorption layer is provided with Elemental Mercury penetrated bed, and sour gas removes
Adsorbent in layer is Na2CO3, the adsorbent of mercury oxide penetrated bed is KCl, and the adsorbent of Elemental Mercury penetrated bed is that demercuration is lived
Property charcoal.
It is also equipped on the quartzy pipeline for filtering flue gas and collecting the filter of particle mercury, filter includes
Quartzy sand core and quartz fibre filter membrane, and filter and activated carbon adsorption pipe are sequentially arranged at along flue gas flow direction on quartzy pipeline.
The thermocouple of test sampling point temperature is added at the smoke inlet of the sampling detection gun, heating layer is outer layer
It is enclosed with the heater strip of Aluminium Radiator.
Pipeline between the flue gas ash removal, deacidification, dehumidification device, volume control device, NO detectors is using acidproof
Corrosive polytetrafluoroethylene material.
The outlet of described every quartzy pipeline be arranged with flue gas ash removal, deacidification, dehumidification device, volume control device with
NO detectors, and flue gas ash removal, deacidification, dehumidification device include removing demijohn with what quartzy pipeline outlet was connected, except the outlet of demijohn
It is connected successively with condenser, drying bottle and secondary filter, secondary filter is connected on volume control device, quartz ampoule
The outlet of line and except being connected to by heat traced pipeline between demijohn, heat traced pipeline include polytetrafluoroethylene (PTFE) inner tube and can make heating
Temperature adjustable resistance wire between 0-180 DEG C, resistance wire are wrapped in outside polytetrafluoroethylene (PTFE) inner tube.
The volume control device includes interconnected mass flow controller and intelligent vacuum pump, secondary filter
Outlet be connected with the entrance of intelligent vacuum pump, the outlet of mass flow controller is connected with NO detectors and computer respectively.
The sampling detection gun top is provided with the supporting mechanism for being fixed to sampling detection gun on walling of flue.
The supporting mechanism includes the support chain being fixed on walling of flue and supporting track, supporting track with for tensing
The support chain of supporting track is connected, and supporting track is connected on sampling detection gun.
Compared with prior art, the beneficial effects of the present invention are：
1, the present invention is provided with the activated carbon adsorption pipe on quartzy pipeline in sampling detection gun and sampling is made to visit
Rifle maintains 120 DEG C or more of heating layer, and at 120 DEG C or more, the activated carbon filled in activated carbon adsorption pipe does not inhale NO
Attached effect, therefore, flue gas is by only capturing the mercury in flue gas when activated carbon adsorption pipe, without adsorbing NO, the mercury of acquisition passes through
Measurement can be realized in offline hg determining device.In addition, since activated carbon at 120 DEG C or more does not have suction-operated to NO, in mercury
After sampling, the content of NO does not change in flue gas, mercury in flue gas and the separation of NO may be implemented, while flue gas enters NO detectors
The NO contents detected afterwards are impregnable.So the present invention for same flue sampled point timesharing multiple repairing weld or
When the multiple repairing weld of same flue difference sampled point, the sampling and detection of NO need not be additionally carried out.It is completed in same sampled point
While mercury samples, the concentration monitor of NO is realized, the mercury and NO concentration values ensured in this way is same sampled point, is improved
Representativeness, repeatability and the sampling efficiency of sampling.
2, several quartzy pipelines are provided in sampling detection gun of the present invention, therefore, the flue gas in every quartzy pipeline all comes
Derived from same sampled point, simultaneously because every quartzy pipeline is mounted on activated carbon adsorption pipe, and every quartzy pipeline goes out
Mouth is arranged with flue gas ash removal, deacidification, dehumidification device, volume control device, it is ensured that the consistency of sampled result.Additionally, due to
Volume control device and NO detectors are connected with for flow detection, data monitoring, record and the computer of processing, therefore, from
NO content detections can be compared in computer in the flue gas flow and flue gas of the outlet of every quartzy pipeline out, if
The error compared is more than set standard, then judgement this time samples invalid, realizes flow Parallel Sampling, testing result mutually school
It is accurate.
3, adsorbent is filled in activated carbon adsorption pipe of the present invention, adsorbent is caught according to flue gas by being sequentially divided into mercury oxide
Layer and Elemental Mercury adsorption layer are obtained, the adsorbent of mercury oxide trapping layer is KCl solid particles, for absorbing bivalent mercury；Elemental Mercury is inhaled
The adsorbent of attached layer is mercury control activated carbon, can absorb Elemental Mercury；Therefore, it when the present invention samples mercury, can realize to simple substance
Mercury and mercuric independent trapping.
Description of the drawings
Fig. 1 is the system structure diagram of the present invention；
Fig. 2 is activated carbon adsorption pipe structure chart；
Removal efficiency figure of Fig. 3 mercury control activated carbons to Elemental Mercury；Wherein, ordinate is removal efficiency, and abscissa is the time；
Fig. 4 is removal efficiency of the mercury control activated carbon to NO；Wherein, ordinate is removal efficiency, and abscissa is the time；
Wherein, 1, walling of flue, 2, support chain, 3, supporting track, 4, sampling detection gun, 5, filter, 6, active carbon adsorption pipe,
7, sealing flange, 8, heat traced pipeline, 9, remove demijohn, 10, condenser, 11, drying bottle, 12, secondary filter, 13, intelligent vacuum
Pump, 14, mass flow controller, 15, NO detectors, 16, laptop, 17, mercury vapourmeter, 18, sour gas remove layer,
19, mercury oxide trapping layer, 20, mercury oxide penetrated bed, 21, Elemental Mercury adsorption layer, 22, Elemental Mercury penetrated bed.
Specific implementation mode
The present invention is described in further details below in conjunction with the accompanying drawings.
Referring to Fig. 1, the present invention includes offline hg determining device and for stretching into the sampling detection gun 4 in flue, sampling detection gun 4
Including shell and it is arranged in shell and for acquiring two of flue gas independent quartzy pipelines, every quartzy pipeline upper edge cigarette
Activated carbon adsorption pipe 6 of the air-flow to filter 5 is sequentially installed with and filled with adsorbent；Add at the smoke inlet of sampling detection gun 4
Equipped with the thermocouple for testing sampling point temperature, there also is provided in the inner walls of sampling detection gun 4 makes sampling detection gun 4 maintain
120~180 DEG C of heating layer, heating layer is the heater strip that outer layer covers have Aluminium Radiator, when thermocouple measures flue-gas temperature
The temperature of sampling detection gun 4 be can guarantee when relatively low at 120~180 DEG C, preferable temperature is 140 DEG C, prevents the water vapour in flue gas cold
It is solidifying to cause the mercury in flue gas not completely into the sample collection system of mercury.
The filter 5 that the present invention is arranged can be filtered flue gas, and can be used for collecting particle mercury, filter
5 include quartzy sand core and quartz fibre filter membrane, and the particle mercury in flue gas is collected on quartz fibre filter membrane, and sampling every time terminates
Filter membrane is sealed etc. to be analyzed.The activated carbon adsorption pipe 6 that the present invention is arranged uses high temperature resistant and non-breakable quartzy material
Material is made, and the adsorbent in activated carbon adsorption pipe 6 is divided into five sections (referring to Fig. 2), and every section is separated by silica wool, and this five sections
According to flue gas by sequentially arranging successively：First segment is that sour gas removes layer, and the adsorbent of this layer is that analysis is pure
Na2CO3, to remove part sour corrosion gas；Second segment is mercury oxide trapping layer, and the adsorbent of this layer is to analyze pure KCl,
For capturing bivalent mercury；Third section is mercury oxide penetrated bed, and the adsorbent of this layer is to analyze pure KCl, further captures bivalent mercury；
4th section is Elemental Mercury adsorption layer, and the adsorbent of this layer is mercury control activated carbon, for capturing Elemental Mercury；5th section is worn for Elemental Mercury
The adsorbent of permeable layers, this layer is mercury control activated carbon, further captures Elemental Mercury.It, can after flue gas is by activated carbon adsorption layer
Complete Elemental Mercury, bivalent mercury individually traps.Therefore, the present invention on quartz ampoule road by being arranged filter 5 and activated carbon adsorption
Pipe 6 can division aspect go arrested particles state mercury, Elemental Mercury, bivalent mercury.
Moreover, also identifier is arranged to every adsorption tube in the present invention, so as to subsequent analysis and trace to the source.It is sent out according to experiment
Existing, under power-plant flue gas component, mercury control activated carbon is very high to the adsorption efficiency of mercury when temperature is 120 DEG C~180 DEG C (can reach
100%), but to NO almost without adsorption effect.Therefore, after activated carbon adsorption pipe 6 in flue gas the content of NO with have just enter into
The content of NO realizes mercury in flue gas and the separation of NO compared to not changing in the flue gas of sampling detection gun 4；Simultaneously as
The present invention is not required in the multiple repairing weld of timesharing multiple repairing weld or same flue difference sampled point for same flue sampled point
Additionally to carry out the sampling and detection of NO so that same sampled point is completed to realize the concentration monitor of NO while mercury sampling, really
It is same sampled point to protect obtained mercury and NO concentration values, improves the representativeness, repeatability and sampling efficiency of sampling in this way, subtracts
Few execute-in-place step, reduces sampling and testing cost.In addition, due to during actual samples sampled point there may be high temperature,
Sampling detection gun 4 of the present invention ensures pipeline sealing using copper washer, eliminates the measurement error caused by gas leakage.
The shell of sampling detection gun 4 is made of stainless steel, and 4 length of entire sampling detection gun is 3 meters.For the ease of sampling operation
With the accuracy for improving sampling, 4 top of sampling detection gun of the invention is provided with for sampling detection gun 4 to be fixed to walling of flue 1
Supporting mechanism, supporting mechanism includes the support chain 2 being fixed on walling of flue 1 and supporting track 3, supporting track 3 with for drawing
The support chain 2 of compact schemes track 3 is connected, and supporting track 3 is connected on the shell of sampling detection gun 4, and therefore, sampling of the invention is visited
Rifle 4 is fixed on walling of flue 1 by support chain 2 and supporting track 3, and after sampling detection gun 4 is put into flue, the present invention also uses
Sealing flange 7 seals sampling detection gun 4 and floss hole.
The offline hg determining device of the present invention is right using the mercury vapourmeter 22 based on electric heating solution-high frequency modulated zeeman atomic absorption
The mercury for collecting the different shape in quartz fibre filter membrane and activated carbon adsorption pipe is analyzed respectively.Assay method is：First
Sample to be tested is placed in quartzy spoon simultaneously precise weighing, is sent to the first part of atomizer, non-volatile mercuration closes
Object can decomposed directly, and the mercury compound and volatile mercury compound for not being reduced into Elemental Mercury completely bring atom by carrier gas
Change the second part of device, all remaining mercury compounds, which are heated again, herein is completely broken down, and enters quartz point with carrier gas
Analyse the measurement that pond carries out mercury content.
The outlet of every quartzy pipeline is arranged with except demijohn 9, condenser 10, drying bottle 11, secondary filter 12, intelligence
Vacuum pump 13, mass flow controller 14 and NO detectors 15, and except demijohn 9, condenser 10, drying bottle 11, final dusting
Device 12, intelligent vacuum pump 13, mass flow controller 14 and NO detectors 15 are sequentially communicated, mass flow controller 14 and NO
Detector 15 is connected with laptop 16, and NO detectors 15 of the present invention are using based on the NO analyses using chemoluminescence method
Instrument is controlled by laptop 16, can set sampling flow, online data monitoring and record, the processing etc. of data one
Series of tasks, the accurate credible, convenient data processing of whole system high degree of automation, data.Due to going out for every quartzy pipeline
Mouth is arranged with except demijohn 9, condenser 10, drying bottle 11, secondary filter 12, intelligent vacuum pump 13, mass flow controller
14 and NO detectors 15 can ensure that the flue gas for entering every quartzy pipeline is all independently handled from beginning to end, and two
Group gas flow path is without intersection, and this guarantees each gas circuits independent flow control system, it is ensured that the consistency of flow
With the consistency of sampled result.Meanwhile mass flow controller 14 of the invention and NO detectors 15 with laptop 16
Both it is connected, data processing is carried out by laptop 16, can make to be mutually authenticated between two samples of same sampled point, such as
Error is above standard, then judgement this time samples invalid, realizes flow Parallel Sampling, as a result mutually calibration.
Mercury in flue gas of the present invention is to carry out absorption acquisition by filter 5 and active carbon adsorption pipe 6, and mercury is all inhaled
It is attached, therefore corrosive gas such as SO is contained only in the flue gas of back segment gas circuit2、NO、NO2, HCl etc., pipe in line is rotten in order to prevent
Erosion, with except demijohn 9 is connected by heat traced pipeline 8, heat traced pipeline 8 includes in polytetrafluoroethylene (PTFE) for the outlet of present invention quartz pipeline
It manages and heating temperature adjustable resistance wire, resistance wire between 0-180 DEG C can be made to be wrapped in outside polyfluortetraethylene pipe, heat
Polytetrafluoroethylene (PTFE) inner tube, this ensures that in the case that the lower corrosive gas made in flue gas of temperature will not with it is therein
The mixed liquefied corrosion for causing pipeline of vapor；Polytetrafluoroethylene (PTFE) inner tube is set as withdrawable simultaneously, convenient for cleaning or more
It changes.In addition, the present invention is except demijohn 9, condenser 10, drying bottle 11, secondary filter 12, intelligent vacuum pump 13, mass flow control
Pipeline between device 14 and NO detectors 15 processed uses the polytetrafluoroethylene material of acid-resistant corrosion.
Contain SO surveying2Or when the higher sample of HCl concentration, acid gas can cause pipeline and subsequent flowmeter, pump
Corrosion, causes device longevity to shorten, and therefore, the present invention is used removes demijohn 9 to SO equipped with NaOH solution2With the sour gas such as HCl
Body is handled, while flue gas has a degree of cooling after NaOH solution absorption bottle.To ensure to effectively remove moisture,
The 10 preferred compressed machine formula two-stage condensation device of condenser of the present invention to the flue gas of acquisition uniformly, rapidly dehumidify, to avoid
Apparatus measures and control section are impacted；In addition, the present invention is also provided with the drying bottle 11 of built-in silica-gel desiccant, in this way
Reached to the dual dehumidifying of flue gas and drying effect by condenser and drying bottle.The secondary filter 12 of the present invention includes quartz sand
Core and quartz fibre filter membrane, flue gas can be controlled effectively by secondary filter 12 into the dust in the flue gas of flow below
Amount, to extend the accuracy of the service life and measurement result of instrument.Therefore, the present invention by it is above-mentioned except demijohn, it is condenser, dry
Dry bottle and secondary filter deacidify to flue gas, dehumidify and dedusting can not only extend the service life of each instrument, and
And the precision of measurement can be improved.
The present invention using intelligent vacuum pump come 13 for intelligent vacuum pump can realize it is intelligent, automatically adjust flow and
Vacuum degree, and there is liquid crystal display panel to show vacuum, valve, control circuit can be added to adjust flow and vacuum to avoid time-consuming and laborious
Degree.Intelligent vacuum pump comes the highly sensitive inlet sensor of 13 outfits, high-quality flow control valve and accurate control electricity simultaneously
Road can complete flow automatic regulation function.The present invention sets intelligent vacuum pump 13 and is run under timing mode, by setting
Surely the working time pumped achievees the purpose that pump is automatically stopped operation and sampling after setting duration.The present invention, which is also provided with, both to be had
The function of mass flowmenter and the mass flow controller (MFC) that gas flow can be automatically controlled, mass flow controller contact
The material of working gas use 316L stainless steels, using metal (such as stainless steel, gold or nickel resistant material) seal for
Control corrosion rate gas and special gas.In addition, MFC and laptop are connected directly by the present invention, pass through laptop
16 complete setting sampling flow, online data monitors and a series of activities such as record, the processing of data.Therefore, the present invention passes through
Intelligent vacuum pump 13 and MFC control flue gas flow, can not only ensure the sampling of constant flow rate, but also the flow sampled can lead to
Intelligent vacuum pump and MFC is crossed dual to accurately control and mutually calibrate.In addition, intelligent vacuum pump 13 and MFC measure sample gas
Flow is the flow under standard state butt, and finally calculated mercury content and NO concentration values meet the standard of standard state butt.
The present invention further illustrates the course of work of coal steam-electric plant smoke sampling and detecting system.
Sampling detection gun 4 of the present invention stretches into flue, and is sealed by sealing flange 6, meanwhile, by the shell and branch of sampling detection gun
It supports track 3 to connect, is then connected directly MFC and laptop 16, setting sampling flue gas is completed by laptop 16
Then flow opens intelligent vacuum pump 13, MFC and NO detectors 15, and intelligent vacuum pump 13 and the parameter of MFC is arranged,
Then sampling detection gun 4 starts to sample, and the thermocouple at the shell smoke inlet of sampling detection gun 4 measures the temperature of sampled point flue gas,
If temperature is less than 120~180 DEG C, the heater strip in heating layer is made to be powered, the temperature in guarantee sampling detection gun 4 120~
180 DEG C, when flue gas respectively enters quartzy pipeline, first passing around 5 dedusting of filter prevents subsequent heat traced pipeline from blocking, after protection
The condensing unit in face, and particle mercury is collected on quartz fibre filter membrane, it then enters back into activated carbon adsorption pipe, division aspect
Bivalent mercury and Elemental Mercury are captured, enters heat traced pipeline 8, heat tracing pipe after being come out from quartzy pipeline by the flue gas of activated carbon adsorption pipe
Resistant heating flue gas on line prevents the sour corrosion gas attack pipeline in flue gas, and flue gas enters from heat traced pipeline 8 to deacidify
Bottle 9, except the NaOH in demijohn 9 absorbs sour gas, the flue gas by deacidification is successively in the dehumidifying of condensed device 10, drying bottle 11
Enter intelligent vacuum pump 13 after the further removal moisture drying of silica-gel desiccant, 12 dedusting of secondary filter, according to intelligent vacuum pump 13
The parameter of setting carries out flow automatic adjustment, and flue gas enters MFC after flow automatically adjusts, by the flue gas of MFC flow controls
Instantaneous concentration and total emission volumn that NO detectors measure NO are eventually entered into, the number of flow information, NO detectors measurement that MFC is measured
According to laptop 16 is passed to, laptop 16 is built-in with control software, can complete setting sampling flow, online data
The a series of activities such as monitoring and record, the processing of data, therefore, the processing through laptop on-line monitoring, record and data,
Finally monitoring result is compared, calculates relative error, if relative error is in setting range (such as 3%), then it is assumed that survey
It is correct to determine result.After the completion of sampling, close intelligent vacuum pump 13 simultaneously sampling detection gun 4 is taken out from flue, to whole system into
Row leak detection.Leak detection takes out adsorption tube 6 after passing through from sampling detection gun 4, is inhaled using based on electric heating solution-high frequency modulated Zeeman atomic
The mercury vapourmeter of receipts method analyzes the mercury in probe tube.
The present invention to flow dual accurately control and mutually calibrate by intelligent vacuum pump and mass flow controller
To realize Parallel Sampling and Constant flow sample.The division aspect trapping that mercury is realized by activated carbon adsorption pipe and filter, is adopted same
Sampling point is completed to realize the concentration monitor of NO while mercury sampling, and NO concentration and sampling flow can come by laptop
Automatic monitoring and data preserve and processing.Whole system can effectively dedusting, deacidification, dehumidifying, effective protection instrument and equipment carries
The high precision measured.
In order to prove mercury control activated carbon 120 DEG C~180 DEG C to NO almost without adsorption effect, the present invention also carried out as
Lower experiment：
The present invention determines demercuration efficiency of the mercury control activated carbon respectively at 20 DEG C, 140 DEG C, 180 DEG C, tests and contains in flue gas
There is the CO of 12% volume2, 3% volume oxygen, and the Elemental Mercury containing 50 μ g in every cubic metre of flue gas.Test result such as Fig. 3
Shown, as seen from Figure 3, mercury control activated carbon is 100% to the adsorption rate of Elemental Mercury.
The present invention also measured were the efficiency of de- NO of the mercury control activated carbon respectively at 20 DEG C, 140 DEG C, 180 DEG C, tests flue gas
In the CO containing 12% volume2, 3% volume oxygen and 500 μ g/m3NO, test results are shown in figure 4, can be with by Fig. 4
It was found that at 20 DEG C, with the extension of time, the efficiency of mercury control activated carbon removing NO continuously decreases；When reaction temperature is increased to 140
DEG C, 180 DEG C when, mercury control activated carbon is to NO almost without removal effect.
Claims (7)
1. a kind of coal steam-electric plant smoke NO and mercury sample simultaneously and the system of detection, it is characterised in that：Including offline hg determining device with
And for stretching into the sampling detection gun in flue (4)；
Sampling detection gun (4) includes the flue gas pipeline being made of several independently arranged quartzy pipelines；Every quartzy pipeline goes out
Mouth is examined with flue gas deacidification, dehumidifying, dust-extraction unit, volume control device and NO successively by the activated carbon adsorption pipe (6) of setting
Instrument (15) is surveyed to be connected；Volume control device and NO detectors (15) with for flow detection, data monitoring, record and processing
Computer be connected；It there also is provided the heating layer for making sampling detection gun (4) maintain 120 DEG C or more on the inner wall of sampling detection gun (4)；
Adsorbent is filled in activated carbon adsorption pipe (6), adsorbent is according to flue gas by being sequentially divided into mercury oxide trapping layer (19)
Adsorbent with Elemental Mercury adsorption layer (21), mercury oxide trapping layer (19) is KCl, and the adsorbent of Elemental Mercury adsorption layer (21) is de-
Mercury activated carbon；It is additionally provided with mercury oxide penetrated bed between the mercury oxide trapping layer (19) and Elemental Mercury adsorption layer (21)
(20), mercury oxide trapping layer (19) front end is provided with sour gas removal layer (18), the rear end setting of Elemental Mercury adsorption layer (21)
There is Elemental Mercury penetrated bed (22), and the adsorbent in sour gas removal layer is Na2CO3, the adsorbent of mercury oxide penetrated bed is
The adsorbent of KCl, Elemental Mercury penetrated bed are mercury control activated carbon；
Offline hg determining device is used to detect the mercury content adsorbed in activated carbon adsorption pipe (6)；
It is also equipped on the quartzy pipeline for filtering flue gas and collecting the filter (5) of particle mercury, filter (5) packet
Quartzy sand core and quartz fibre filter membrane are included, and filter (5) and activated carbon adsorption pipe (6) are sequentially arranged at quartz along flue gas flow direction
On pipeline.
2. coal steam-electric plant smoke NO according to claim 1 and mercury sample simultaneously and the system of detection, it is characterised in that：It is described
Sampling detection gun smoke inlet at add test sampling point temperature thermocouple, heating layer be outer layer covers have aluminum dissipate
The heater strip of hot device.
3. coal steam-electric plant smoke NO according to claim 1 and mercury sample simultaneously and the system of detection, it is characterised in that：It is described
Flue gas deacidification, dehumidifying, dust-extraction unit, volume control device, the pipeline between NO detectors (15) uses polytetrafluoroethylene (PTFE) material
Material is made.
4. coal steam-electric plant smoke NO according to claim 1 or 3 and mercury sample simultaneously and the system of detection, it is characterised in that：
The described flue gas deacidification, dehumidifying, dust-extraction unit include with quartzy pipeline outlet be sequentially connected except demijohn (9), condenser (10),
Drying bottle (11) and secondary filter (12)；Secondary filter (12) is connected on volume control device, and quartzy pipeline goes out
Mouthful and except being connected to by heat traced pipeline (8) between demijohn (9), heat traced pipeline (8) includes polytetrafluoroethylene (PTFE) inner tube and can make
Heating temperature adjustable resistance wire between 0-180 DEG C, resistance wire are wrapped in outside polytetrafluoroethylene (PTFE) inner tube.
5. coal steam-electric plant smoke NO according to claim 4 and mercury sample simultaneously and the system of detection, it is characterised in that：It is described
Volume control device include interconnected mass flow controller (14) and intelligent vacuum pump (13), secondary filter (12)
Outlet be connected with the entrance of intelligent vacuum pump (13), the outlet of mass flow controller (14) respectively with NO detectors (15)
It is connected with computer.
6. coal steam-electric plant smoke sampling according to claim 1 and detecting system, it is characterised in that：The sampling detection gun
(4) top is provided with the supporting mechanism for being fixed to sampling detection gun (4) on walling of flue (1).
7. coal steam-electric plant smoke NO according to claim 6 and mercury sample simultaneously and the system of detection, it is characterised in that：It is described
Supporting mechanism include being fixed on support chain (2) and supporting track (3) on walling of flue (1), supporting track (3) be used to tense
The support chain (2) of supporting track (3) is connected, and sampling detection gun (4) is connected on supporting track (3).
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| CN201510769786.8A CN105300744B (en) | 2015-11-11 | 2015-11-11 | A kind of system of coal steam-electric plant smoke NO and mercury sampling and detection simultaneously |
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| CN106918682A (en) * | 2017-05-08 | 2017-07-04 | 秦皇岛海涛万福环保设备股份有限公司 | A kind of flue gas real time on-line monitoring system in the smoke eliminator for Cremation Machine |
| CN107462447A (en) * | 2017-08-02 | 2017-12-12 | 东南大学 | A kind of device that gas mercury measurement of concetration is carried out using modified flying dust |
| CN107655728B (en) * | 2017-11-09 | 2024-05-07 | 中国华能集团清洁能源技术研究院有限公司 | Device and method suitable for sampling and monitoring low-volatility trace elements in flue gas |
| CN107991144A (en) * | 2017-11-30 | 2018-05-04 | 宁夏大学 | A kind of coal pyrolysis gas Elemental Mercury sampling system |
| CN109173706A (en) * | 2018-09-07 | 2019-01-11 | 西安热工研究院有限公司 | A kind of temperature of the big section flue of denitration, nitric oxide, oxygen multiple spot real-time measurement system |
| CN109323895B (en) * | 2018-10-23 | 2021-09-14 | 攀钢集团攀枝花钢铁研究院有限公司 | On-line sampling system for measuring total S content of coke oven gas |
| CN109556927B (en) * | 2018-12-26 | 2024-05-17 | 南京理工大学 | Sampling device and method for mercury in high-temperature flue gas |
| CN112730546B (en) * | 2020-12-28 | 2022-09-13 | 武汉理工大学 | Portable flue gas analysis device |
| CN113325133A (en) * | 2021-05-19 | 2021-08-31 | 福建省锅炉压力容器检验研究院 | Method and device for detecting mercury in waste incineration flue gas |
| CN113640068A (en) * | 2021-08-31 | 2021-11-12 | 苏州西热节能环保技术有限公司 | Multipurpose flue gas sampling system |
| CN115112587A (en) * | 2022-07-22 | 2022-09-27 | 北京清新环境技术股份有限公司 | Method for detecting mercury content in industrial flue gas and dry adsorption sampling device |
| CN115672288B (en) * | 2022-10-12 | 2024-01-23 | 浙大宁波理工学院 | Modified nylon membrane for selectively separating bivalent mercury and zero-valent mercury in atmosphere and preparation method thereof |
| CN117705517A (en) * | 2023-12-08 | 2024-03-15 | 河北易高生物燃料有限公司 | Temperature-adjustable sampling system for measuring heavy metal content of flue gas and control method thereof |
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