CN205192809U - System for flue gas NO of thermal power plant and mercury are sampled simultaneously and are detected - Google Patents
System for flue gas NO of thermal power plant and mercury are sampled simultaneously and are detected Download PDFInfo
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- CN205192809U CN205192809U CN201520897284.9U CN201520897284U CN205192809U CN 205192809 U CN205192809 U CN 205192809U CN 201520897284 U CN201520897284 U CN 201520897284U CN 205192809 U CN205192809 U CN 205192809U
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Abstract
The utility model provides a system for flue gas NO of thermal power plant and mercury are sampled simultaneously and are detected, includes that sample that the off -line was surveyed the mercury device and was arranged in stretching into the flue visits the rifle, and the flue gas pipeline that the rifle was visited in the sample be a plurality of independent setting's quartzy pipeline, and the export of quartzy pipeline is linked together with flue gas dust removal, deacidify, dehydrating unit, flow control device and NO detector in proper order, and flow control device and NO detector are all continuous with the computer, the sample arranges still that it maintains the zone of heating more than 120 DEG C to make the sample visit the rifle on visiting the shells inner wall of rifle, installs the active carbon adsorption pipe on every quartzy pipeline, and the intraductal packing of active carbon adsorption has an adsorbent, and the adsorbent is divided into the adsorbent according to the flue gas through the order and catches the simple substance mercury adsorption layer that layer and adsorbent are the demercuration active carbon for KCl's mercury oxide. The utility model discloses can realize simultaneously can also realizing the parallel sampling of flow and sampling the testing result mutual calibration with the constant current in the sampling and the detection of two kinds of pollutants of same sampling point NO and mercury in power plant's flue gas.
Description
Technical field
The utility model relates to a kind of environment measuring sample devices, is specifically related to the system that a kind of coal steam-electric plant smoke NO and mercury are sampled simultaneously and detected.
Background technology
Coal fire discharged mercury is a kind of hypertoxic pollutant, when mercury emissions is in air, will cause serious harm.Mercury is a kind of neurotoxin, can be accumulated in cerebral tissue, causes human motion imbalance, aphasis etc.Coal steam-electric plant smoke, while denitration, dedusting and desulfurization, can produce the effect of cooperation-removal to mercury.What mercury was advised by European Union's " best practicable technology reference paper of large-scale burner " removes the technology path paid the utmost attention to and adopt high-effective dust-removing, flue gas desulfurization and denitration Collaborative Control.
SCR technology (SCR technique) has become the mainstream technology of Chinese thermal power plant denitration.According to the 2012 annual coal steam-electric plant smoke Denitration Industry information displaying that middle Electricity Federation is issued, the coal steam-electric plant smoke denitration unit capacity that newly puts into operation for 2012 about 9,000 ten thousand kilowatts, wherein, the denitration unit capacity of SCR technology (SCR technique) is adopted to account for 98% of the denitration unit total volume that puts into operation then.By the end of the year 2012, the coal steam-electric plant smoke denitration unit total volume that put into operation, more than 2.3 hundred million kilowatts, will account for 28% of national active service fired power generating unit capacity, and according to the legal requiremnt of country, denitration unit popularity rate reaches more than 80% to predict on July 1st, 2014.
Basing oneself upon existing SCR facility, seek mercury efficient oxidation in SCR and remove, thus realize mercury removal at low cost, is the research direction of the current national conditions of applicable China.Under the prerequisite do not affected or improve denitration efficiency, filter out SCR catalyst active component and the preparation method of energy efficient oxidation mercury, the cost of catalyzer can be reduced simultaneously.
The cost consumption of various material and the energy from denitrating technique, reductive agent accounts for 21% of total cost, and catalyzer accounts for 40% of total cost, and all the other are power consumption, water consumption, maintenance of equipment and cost of labor etc.As can be seen here, the exploitation of catalyzer is the key reducing costs and improve denitration efficiency.Although vanadia-based SCR catalysts realizes commercial Application, still there are some defects in it, such as specific surface area is lower, temperature window is narrower, V
2o
5there is severe toxicity, the oxidation efficiency of mercury is relied on to HCl and is subject to SOx and NH
3suppression etc.Therefore be necessary to study the Novel SCR catalyzer that can overcome these shortcomings of business SCR catalyst.
In order to study Novel SCR catalyzer to the oxidation removal efficiency of mercury and the reduction efficiency to NO, finally developing can efficiently reductive NO again can the SCR catalyst of efficient oxidation mercury, realize such goal in research, the sampling of mercury and NO and detection are important underlying issues.Only has the mercury and NO sampling and monitoring system of setting up a set of accurate, credible, low cost, NO in flue gas before and after SCR denitration device, mercury are sampled and measured, find out the regularity of distribution of NO, mercury when using different SCR catalyst, just can illustrate different active components and preparation method to the impact of catalyzer denitration performance, demercuration performance; Illustrate different operating temperature, air speed ratio, HCl, O
2, SO
2, NH
3etc. factor on mercury oxidation and the impact that removes.Final under the prerequisite do not affected or improve denitration efficiency, filter out in the presence of a harsh environment still can efficient oxidation mercury, SCR catalyst active component that cost is lower and preparation method.
But in prior art, only have the system that NO in flue gas or mercury are sampled separately and detected, also do not develop the system that can realize sampling simultaneously to NO and mercury and detecting, cause sampling and testing cost high.Simultaneously owing to cannot detect NO and mercury to same sampling spot simultaneously, cause the mercury that obtains and NO concentration value not to be same sampled points, this has had a strong impact on NO and mercury sampling and the representativeness detected, repeatability and efficiency.In addition, being used for gathering the adsorbent of mercury in flue gas is activated charcoal, and those skilled in the art think that activated charcoal is have adsorbing to NO, and this also constrains the development of the system sampled to NO in flue gas and mercury simultaneously and detect to a great extent.
Utility model content
The purpose of this utility model is to propose the system that a kind of coal steam-electric plant smoke NO and mercury are sampled simultaneously and detected, this system can realize sampling and the detection of NO and mercury two kinds of pollutants in power-plant flue gas simultaneously, can division aspect trap when sampling to mercury, and flow Parallel Sampling and Constant flow sample can also be realized, testing result is calibrated mutually.
In order to achieve the above object, the technical solution adopted in the utility model is: comprise off-line hg determining device and for stretching into the sampling detection gun in flue, the flue gas pipeline of sampling detection gun is some the independent quartzy pipelines arranged, the outlet of every bar quartz pipeline is connected with flue gas ash removal, deacidification, dehydrating unit, volume control device and NO detector successively, and volume control device and NO detector all with for flow detection, data monitoring, record are connected with the computer of process; Wherein, the inwall of sampling detection gun is also furnished with the zone of heating making sampling detection gun maintain more than 120 DEG C, every bar quartz pipeline is provided with charcoal absorption pipe, adsorbent is filled with in charcoal absorption pipe, adsorbent is divided into mercury oxide trapping layer and Elemental Mercury adsorbed layer according to flue gas by order, the adsorbent of mercury oxide trapping layer is KCl, and the adsorbent of Elemental Mercury adsorbed layer is mercury control activated carbon.
Mercury oxide penetrated bed is also provided with between described mercury oxide trapping layer and Elemental Mercury adsorbed layer, mercury oxide trapping layer front end is provided with sour gas removing layer, the rear end of Elemental Mercury adsorbed layer is provided with Elemental Mercury penetrated bed, and the adsorbent in sour gas removing layer is Na
2cO
3, the adsorbent of mercury oxide penetrated bed is KCl, and the adsorbent of Elemental Mercury penetrated bed is mercury control activated carbon.
Described quartzy pipeline is also provided with the filtrator for filtering flue gas and collecting granules state mercury, filtrator comprises quartzy core and quartz fibre filter membrane, and filtrator and charcoal absorption pipe are arranged on quartzy pipeline successively along flue gas flow direction.
The smoke inlet place of described sampling detection gun adds the thermopair of test sampling point temperature, and zone of heating is the heater strip that outer layer covers has Aluminium Radiator.
Pipeline between described flue gas ash removal, deacidification, dehydrating unit, volume control device, NO detector adopts the polytetrafluoroethylmaterial material of acid-resistant corrosion.
The outlet of described every bar quartz pipeline is all furnished with flue gas ash removal, deacidification, dehydrating unit, volume control device and NO detector, and flue gas ash removal, deacidification, dehydrating unit comprise be connected with quartzy pipeline outlet except demijohn, except demijohn outlet successively with condenser, drying bottle and secondary filter are connected, secondary filter is connected on volume control device, the outlet of quartz pipeline and except being communicated with by heat tracing pipe between demijohn, heat tracing pipe comprises in teflon the resistance wire of managing and heating-up temperature can be made adjustable between 0-180 DEG C, it is outside that resistance wire is wrapped in pipe in teflon.
Described volume control device comprises the mass flow controller and intelligent vacuum pump that are interconnected, and the outlet of secondary filter is connected with the entrance of intelligent vacuum pump, and the outlet of mass flow controller is connected with computer with NO detector respectively.
Described sampling detection gun top is provided with the supporting mechanism for being fixed to by sampling detection gun on walling of flue.
Described supporting mechanism comprises and is fixed on support chain on walling of flue and supporting track, and supporting track is connected with the support chain for straining supporting track, and supporting track is connected on sampling detection gun.
Compared with prior art, the beneficial effects of the utility model are:
1, the utility model is provided with the charcoal absorption pipe that is arranged on quartzy pipeline and makes sampling detection gun maintain the zone of heating of more than 120 DEG C in sampling detection gun, time more than 120 DEG C, the activated charcoal of filling in charcoal absorption pipe does not have suction-operated to NO, therefore, flue gas is by only catching the mercury in flue gas during charcoal absorption pipe, and NO can not be adsorbed, the mercury of collection can realize measuring by off-line hg determining device.In addition, because activated charcoal does not have suction-operated to NO more than 120 DEG C, therefore after mercury sampling, in flue gas, the content of NO does not change, and can realize being separated of mercury in flue gas and NO, and the NO content detected after flue gas enters NO detector is simultaneously impregnable.So the utility model, when the multiple repairing weld for the timesharing multiple repairing weld of same flue sampled point or the different sampled point of same flue, does not need sampling and the detection of additionally carrying out NO.While same sampled point completes mercury sampling, achieve the concentration monitor of NO, guarantee that the mercury that obtains and NO concentration value are same sampled points like this, improve the representativeness of sampling, repeatability and sampling efficiency.
2, some quartzy pipelines are provided with in the utility model sampling detection gun, therefore, flue gas in every bar quartz pipeline all derives from same sampled point, simultaneously because every bar quartz pipeline is all provided with charcoal absorption pipe, and the outlet of every bar quartz pipeline is all furnished with flue gas ash removal, deacidification, dehydrating unit, volume control device, ensure that the consistance of sampled result.In addition because volume control device and NO detector all with for flow detection, data monitoring, record are connected with the computer of process, therefore, from the outlet of every bar quartz pipeline flue gas flow out and flue gas, NO content detection can compare in computer, if the error compared exceedes set standard, then judge that this time sampling is invalid, realize flow Parallel Sampling, testing result is calibrated mutually.
3, be filled with adsorbent in the utility model charcoal absorption pipe, adsorbent is divided into mercury oxide trapping layer and Elemental Mercury adsorbed layer according to flue gas by order, and the adsorbent of mercury oxide trapping layer is KCl solid particle, for absorbing bivalent mercury; The adsorbent of Elemental Mercury adsorbed layer is mercury control activated carbon, can absorb Elemental Mercury; Therefore, when the utility model is sampled to mercury, can realize Elemental Mercury and mercuric independent trapping.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present utility model;
Fig. 2 is charcoal absorption duct ligation composition;
Fig. 3 mercury control activated carbon is to the removal efficiency figure of Elemental Mercury; Wherein, ordinate is removal efficiency, and horizontal ordinate is the time;
Fig. 4 is the removal efficiency of mercury control activated carbon to NO; Wherein, ordinate is removal efficiency, and horizontal ordinate is the time;
Wherein, 1, walling of flue, 2, support chain, 3, supporting track, 4, sampling detection gun, 5, filtrator, 6, active carbon adsorption pipe, 7, seal flange, 8, heat tracing pipe, 9, except demijohn, 10, condenser, 11, drying bottle, 12, secondary filter, 13, intelligent vacuum pump, 14, mass flow controller, 15, NO detector, 16, notebook computer, 17, mercury vapor analyzer, 18, sour gas removing layer, 19, mercury oxide trapping layer, 20, mercury oxide penetrated bed, 21, Elemental Mercury adsorbed layer, 22, Elemental Mercury penetrated bed.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further details.
See Fig. 1, the utility model comprises off-line hg determining device and for stretching into the sampling detection gun 4 in flue, sampling detection gun 4 comprises housing and to be arranged in housing and for gather flue gas two independently quartzy pipelines, every bar quartz pipeline to be provided with filtrator 5 successively along flue gas flow direction and to be filled with the charcoal absorption pipe 6 of adsorbent; The smoke inlet place of sampling detection gun 4 adds the thermopair of test sampling point temperature, the inner walls of sampling detection gun 4 is also furnished with the zone of heating making sampling detection gun 4 maintain 120 ~ 180 DEG C, zone of heating is the heater strip that outer layer covers has Aluminium Radiator, when thermopair record flue-gas temperature lower time can ensure that the temperature of sampling detection gun 4 is at 120 ~ 180 DEG C, preferable temperature is 140 DEG C, prevents the water vapour condensation in flue gas from causing the mercury in flue gas not enter the sample collection system of mercury completely.
The filtrator 5 that the utility model is arranged can filter flue gas, and collecting granules state mercury can also be used for, filtrator 5 comprises quartzy core and quartz fibre filter membrane, and the particle mercury in flue gas is collected on quartz fibre filter membrane, and each sampling terminates filter membrane sealing to preserve etc. to be analyzed.The charcoal absorption pipe 6 that the utility model is arranged adopts high temperature resistant and not breakable quartz material to make, adsorbent in charcoal absorption pipe 6 is divided into five sections (see Fig. 2), and every section is separated by silica wool, and these five sections are arranged by order successively according to flue gas: first paragraph is sour gas removing layer, the adsorbent of this layer is for analyzing pure Na
2cO
3, in order to remove portion sour corrosion gas; Second segment is mercury oxide trapping layer, and the adsorbent of this layer is the pure KCl of analysis, for catching bivalent mercury; 3rd section is mercury oxide penetrated bed, and the adsorbent of this layer, for analyzing pure KCl, catches bivalent mercury further; 4th section is Elemental Mercury adsorbed layer, and the adsorbent of this layer is mercury control activated carbon, for catching Elemental Mercury; 5th section is Elemental Mercury penetrated bed, and the adsorbent of this layer is mercury control activated carbon, catches Elemental Mercury further.When flue gas is by after activated carbon adsorption layer, can Elemental Mercury be completed, bivalent mercury traps separately.Therefore, the utility model by arranging filtrator 5 and charcoal absorption pipe 6 division aspect can go arrested particles state mercury, Elemental Mercury, bivalent mercury on quartzy pipeline.
And the utility model also arranges identifier to every root adsorption tube, so that follow-up analysis and tracing to the source.Experimentally find, under power-plant flue gas component, when temperature is 120 DEG C ~ 180 DEG C, mercury control activated carbon is to the adsorption efficiency of mercury very high (can reach 100%), but does not almost have adsorption effect to NO.Therefore, after charcoal absorption pipe 6, in flue gas, the content of NO is do not have vicissitudinous compared with the content of NO in the flue gas just entering sampling detection gun 4, achieves being separated of mercury in flue gas and NO; Simultaneously, because the utility model is when the multiple repairing weld for the timesharing multiple repairing weld of same flue sampled point or the different sampled point of same flue, do not need sampling and the detection of additionally carrying out NO, the concentration monitor of NO is achieved while making same sampled point complete mercury sampling, guarantee that the mercury that obtains and NO concentration value are same sampled points, which enhance the representativeness of sampling, repeatability and sampling efficiency, reduce execute-in-place step, reduce sampling and testing cost.In addition, because in actual samples process, sampled point may exist high temperature, the utility model sampling detection gun 4 adopts copper packing ring to ensure pipeline sealing, eliminates because of the measuring error caused of leaking gas.
The housing of sampling detection gun 4 is that stainless steel is made, and whole sampling detection gun 4 length is 3 meters.For the ease of sampling operation and the accuracy improving sampling, sampling detection gun 4 top of the present utility model is provided with the supporting mechanism for being fixed to by sampling detection gun 4 on walling of flue 1, supporting mechanism comprises and is fixed on support chain 2 on walling of flue 1 and supporting track 3, supporting track 3 is connected with the support chain 2 for straining supporting track 3, supporting track 3 is connected on the housing of sampling detection gun 4, therefore, sampling detection gun 4 of the present utility model is fixed on walling of flue 1 by support chain 2 and supporting track 3, after sampling detection gun 4 puts into flue, the utility model also adopts seal flange 7 sampling detection gun 4 and floss hole to be sealed.
Off-line hg determining device of the present utility model uses and analyzes respectively based on the mercury of mercury vapor analyzer 22 to the different shape be collected in quartz fibre filter membrane and charcoal absorption pipe of electric heating solution-high frequency modulated zeeman atomic absorption.Assay method is: first testing sample is placed in quartzy spoon and precise weighing, be sent to the Part I of atomizer, non-volatile mercury compound is at meeting Direct Resolution, the mercury compound and the volatile mercury compound that are not reduced into Elemental Mercury are completely brought into the Part II of atomizer by carrier gas, here all remaining mercury compounds by again heating be completely broken down, enter with carrier gas the mensuration that quartzy analysis cell carries out mercury content.
The outlet of every bar quartz pipeline is all furnished with deacidification bottle 9, condenser 10, drying bottle 11, secondary filter 12, intelligent vacuum pump 13, mass flow controller 14 and NO detector 15, and except demijohn 9, condenser 10, drying bottle 11, secondary filter 12, intelligent vacuum pump 13, mass flow controller 14 and NO detector 15 are communicated with successively, mass flow controller 14 is all connected with notebook computer 16 with NO detector 15, the utility model NO detector 15 adopts the NO analyser based on adopting chemoluminescence method, controlled by notebook computer 16, sampling flow can be set, the record of online data monitoring and data, the a series of activities such as process, whole system automaticity is high, data are accurately credible, convenient data processing.Outlet due to every bar quartz pipeline is all furnished with deacidification bottle 9, condenser 10, drying bottle 11, secondary filter 12, intelligent vacuum pump 13, mass flow controller 14 and NO detector 15 can ensure that the flue gas entering every bar quartz pipeline all independently processes from start to finish, and two groups of gas flow paths are without intersection, this guarantees each gas circuit and all have independently flow control system, guarantee the consistance of flow and the consistance of sampled result.Simultaneously, mass flow controller 14 of the present utility model is all connected with notebook computer 16 with NO detector 15, data processing is carried out by notebook computer 16, just can make mutually to verify between same sampled point two samples, as both errors are above standard, then judge that this time sampling is invalid, realize flow Parallel Sampling, result is calibrated mutually.
Mercury in the utility model flue gas carries out absorption collection by filtrator 5 and active carbon adsorption pipe 6, and mercury is all adsorbed, in the flue gas of therefore back segment gas circuit only containing corrosive gas as SO
2, NO, NO
2, HCl etc., corrode to prevent pipe in line, the outlet of the utility model quartz pipeline is connected by heat tracing pipe 8 with except demijohn 9, heat tracing pipe 8 comprises in teflon the resistance wire of managing and heating-up temperature can be made adjustable between 0-180 DEG C, resistance wire is wrapped in outside polyfluortetraethylene pipe, pipe in heating teflon, so just can ensure to make when temperature is lower corrosive gas in flue gas can not the mixed liquefied corrosion causing pipeline with water vapor wherein; In teflon, pipe is set to withdrawable simultaneously, is convenient to cleaning or changes.In addition, the utility model is except the polytetrafluoroethylmaterial material of the pipeline employing acid-resistant corrosion between demijohn 9, condenser 10, drying bottle 11, secondary filter 12, intelligent vacuum pump 13, mass flow controller 14 and NO detector 15.
In survey containing SO
2or during the higher sample of HCl concentration, acid gas can cause corrosion to pipeline and flowmeter below, pump, causes device longevity to shorten, therefore, the utility model adopt be equipped with NaOH solution except demijohn 9 couples of SO
2process with the sour gas such as HCl, flue gas has cooling to a certain degree after NaOH solution absorption bottle simultaneously.For guaranteeing effectively to remove moisture, condenser 10 preferred compressed machine formula two-stage condensation device of the present utility model, carries out evenly, rapidly dehumidifying, to avoid impacting apparatus measures and control section to the flue gas gathered; In addition, the utility model is also provided with the drying bottle 11 of built-in silica-gel desiccant, is reached the dual dehumidifying of flue gas and drying effect like this by condenser and drying bottle.Secondary filter 12 of the present utility model comprises quartzy core and quartz fibre filter membrane, and flue gas can effectively control to enter the Dust Capacity in the flue gas of flow process below by secondary filter 12, with the accuracy in the serviceable life and measurement result that extend instrument.Therefore, the utility model deacidifies to flue gas through above-mentioned, to dehumidify and dedusting not only can extend serviceable life of each instrument except demijohn, condenser, drying bottle and secondary filter, and can improve the precision of measurement.
The utility model adopts intelligent vacuum pump to come 13 for intelligent vacuum pump can realize intellectuality, automatically adjust flux and vacuum tightness, and has liquid crystal panel display vacuum, and can avoid wastes time and energy adds valve, control circuit carrys out adjust flux and vacuum tightness.Intelligent vacuum pump carrys out the highly sensitive inlet sensor of 13 outfits simultaneously, and high-quality flow control valve and precise control circuit can complete flow automatic regulation function.The utility model setting intelligent vacuum pump 13 is run under timing mode, by setting working time of pump, reaches the object of the out of service and sampling automatically of pump after setting duration.The utility model be also provided with not only there is mass flowmeter function, but also automatically can control the mass flow controller (MFC) of gas flow, the material of mass flow controller contact working gas adopts 316L stainless steel, adopts metal (as resistant materials such as stainless steel, gold or nickel) sealing for control corrosion rate gas and special gas.In addition, MFC is directly connected with notebook computer by the utility model, completes setting sampling flow, online data monitoring and a series of activities such as record, process of data by notebook computer 16.Therefore, the utility model controls flue gas flow by intelligent vacuum pump 13 and MFC, not only can ensure the sampling of constant rate, and the flow of sampling can come dual accurate control and calibration mutually by intelligent vacuum pump and MFC.In addition, it is flow under mark state butt that intelligent vacuum pump 13 and MFC record sample gas flow, and the mercury content finally calculated and NO concentration value meet the standard of mark state butt.
The utility model is described the course of work of coal steam-electric plant smoke sampling and detection system further.
The utility model sampling detection gun 4 stretches into flue, and sealed by seal flange 6, simultaneously, the housing of sampling detection gun is connected with supporting track 3, then MFC is directly connected with notebook computer 16, setting sampling flue gas flow is completed by notebook computer 16, then intelligent vacuum pump 13 is opened, MFC and NO detector 15, and the parameter of intelligent vacuum pump 13 and MFC is set, then sampling detection gun 4 starts sampling, the temperature of the thermocouple measurement sampled point flue gas at the housing smoke inlet place of sampling detection gun 4, if when temperature is lower than 120 ~ 180 DEG C, heater strip in zone of heating is energized, temperature in guarantee sampling detection gun 4 is at 120 ~ 180 DEG C, when flue gas enters quartzy pipeline respectively, first prevent heat tracing pipe below from blocking through filtrator 5 dedusting, protection condensing unit below, and particle mercury is collected on quartz fibre filter membrane, and then enter in charcoal absorption pipe, division aspect catches bivalent mercury and Elemental Mercury, out heat tracing pipe 8 is entered afterwards from quartzy pipeline by the flue gas of charcoal absorption pipe, Resistant heating flue gas on heat tracing pipe, prevent the sour corrosion gas attack pipeline in flue gas, flue gas enters except demijohn 9 from heat tracing pipe 8, except the NaOH in demijohn 9 absorbs sour gas, flue gas through deacidification dehumidifies through condenser 10 successively, the further removal moisture drying of silica-gel desiccant in drying bottle 11, intelligent vacuum pump 13 is entered after secondary filter 12 dedusting, carry out flow according to the parameter of intelligent vacuum pump 13 setting automatically to regulate, flue gas enters MFC after flow regulates automatically, flue gas through MFC flow control finally enters instantaneous concentration and the total emission volumn that NO detector measures NO, the flow information that MFC measures, the data that NO detector measures pass to notebook computer 16, notebook computer 16 is built-in with control software design, setting sampling flow can be completed, the record of online data monitoring and data, the a series of activities such as process, therefore, through notebook computer on-line monitoring, the process of record and data, monitoring result contrasts the most at last, calculate relative error, if relative error is in setting range (as 3%), then think that measurement result is correct.After having sampled, close intelligent vacuum pump 13 and sampling detection gun 4 is taken out from flue, whole system is hunted leak.Hunt leak by after adsorption tube 6 is taken out from sampling detection gun 4, adopt the mercury vapor analyzer based on electric heating solution-high frequency modulated zeeman atomic absorption to analyze the mercury in stopple coupon.
The utility model carries out dual accurate control by intelligent vacuum pump and mass flow controller to flow and mutually calibrates to realize Parallel Sampling and Constant flow sample.Realized the division aspect trapping of mercury by charcoal absorption pipe and filtrator, while same sampled point completes mercury sampling, realize the concentration monitor of NO, and NO concentration and sampling flow can carry out automatic monitoring by notebook computer and data are preserved and process.Whole system can effectively dedusting, deacidification, dehumidifying, available protecting instrument and equipment, improves the precision of measurement.
In order to prove that mercury control activated carbon does not almost have adsorption effect at 120 DEG C ~ 180 DEG C to NO, the utility model has also carried out following test:
The utility model determines the demercuration efficiency of mercury control activated carbon respectively 20 DEG C, 140 DEG C, 180 DEG C time, the CO containing 12% volume in experiment flue gas
2, 3% volume oxygen, and containing the Elemental Mercury of 50 μ g in every cubic metre of flue gas.As shown in Figure 3, as seen from Figure 3, mercury control activated carbon is 100% to the adsorption rate of Elemental Mercury to test result.
The utility model also measured weres the efficiency of the de-NO of mercury control activated carbon respectively 20 DEG C, 140 DEG C, 180 DEG C time, the CO containing 12% volume in experiment flue gas
2, the oxygen of 3% volume and 500 μ g/m
3nO, as shown in Figure 4, when can find 20 DEG C by Fig. 4, along with the prolongation of time, the efficiency that mercury control activated carbon removes NO reduces test result gradually; When temperature of reaction brings up to 140 DEG C, 180 DEG C, mercury control activated carbon does not almost have removal effect to NO.
Claims (9)
1. coal steam-electric plant smoke NO and the mercury system of sampling simultaneously and detecting, is characterized in that: comprise off-line hg determining device and for stretching into the sampling detection gun (4) in flue;
Sampling detection gun (4) comprises the flue gas pipeline be made up of some the independent quartzy pipelines arranged; The outlet of every bar quartz pipeline by the charcoal absorption pipe (6) that arranges successively with flue gas ash removal, deacidification, dehydrating unit, volume control device and NO detector (15) are connected; Volume control device all with for flow detection, data monitoring, record is connected with the computer of process with NO detector (15); The inwall of sampling detection gun (4) is also furnished with the zone of heating making sampling detection gun (4) maintain more than 120 DEG C;
Charcoal absorption pipe is filled with adsorbent in (6), adsorbent is divided into mercury oxide trapping layer (19) and Elemental Mercury adsorbed layer (21) according to flue gas by order, the adsorbent of mercury oxide trapping layer (19) is KCl, and the adsorbent of Elemental Mercury adsorbed layer (21) is mercury control activated carbon;
Off-line hg determining device is used for the mercury content detecting absorption in charcoal absorption pipe (6).
2. coal steam-electric plant smoke NO according to claim 1 and the mercury system of sampling simultaneously and detecting, it is characterized in that: between described mercury oxide trapping layer (19) and Elemental Mercury adsorbed layer (21), be also provided with mercury oxide penetrated bed (20), mercury oxide trapping layer (19) front end is provided with sour gas removing layer (18), the rear end of Elemental Mercury adsorbed layer (21) is provided with Elemental Mercury penetrated bed (22), and the adsorbent in sour gas removing layer is Na
2cO
3, the adsorbent of mercury oxide penetrated bed is KCl, and the adsorbent of Elemental Mercury penetrated bed is mercury control activated carbon.
3. coal steam-electric plant smoke NO according to claim 1 and the mercury system of sampling simultaneously and detecting, it is characterized in that: described quartzy pipeline is also provided with the filtrator (5) for filtering flue gas and collecting granules state mercury, filtrator (5) comprises quartzy core and quartz fibre filter membrane, and filtrator (5) and charcoal absorption pipe (6) are arranged on quartzy pipeline successively along flue gas flow direction.
4. coal steam-electric plant smoke NO according to claim 1 and the mercury system of sampling simultaneously and detecting, it is characterized in that: the smoke inlet place of described sampling detection gun adds the thermopair of test sampling point temperature, and zone of heating is the heater strip that outer layer covers has Aluminium Radiator.
5. coal steam-electric plant smoke NO according to claim 1 and the mercury system of sampling simultaneously and detecting, it is characterized in that: described flue gas ash removal, deacidification, dehydrating unit, volume control device, the pipeline between NO detector (15) adopts polytetrafluoroethylmaterial material to make.
6. coal steam-electric plant smoke NO and the mercury system of sampling simultaneously and detecting according to claim 1 or 5, is characterized in that: described flue gas ash removal, deacidification, dehydrating unit comprise be connected successively with quartzy pipeline outlet except demijohn (9), condenser (10), drying bottle (11) and secondary filter (12); Secondary filter (12) is connected on volume control device, the outlet of quartz pipeline and being communicated with by heat tracing pipe (8) except between demijohn (9), heat tracing pipe (8) comprises in teflon the resistance wire of managing and heating-up temperature can be made adjustable between 0-180 DEG C, and it is outside that resistance wire is wrapped in pipe in teflon.
7. coal steam-electric plant smoke NO according to claim 6 and the mercury system of sampling simultaneously and detecting, it is characterized in that: described volume control device comprises the mass flow controller (14) and intelligent vacuum pump (13) that are interconnected, the outlet of secondary filter (12) is connected with the entrance of intelligent vacuum pump (13), and the outlet of mass flow controller (14) is connected with computer with NO detector (15) respectively.
8. coal steam-electric plant smoke NO according to claim 1 and the mercury system of sampling simultaneously and detecting, is characterized in that: described sampling detection gun (4) top is provided with the supporting mechanism for being fixed to by sampling detection gun (4) on walling of flue (1).
9. coal steam-electric plant smoke NO according to claim 8 and the mercury system of sampling simultaneously and detecting, it is characterized in that: described supporting mechanism comprises and is fixed on support chain (2) on walling of flue (1) and supporting track (3), supporting track (3) is connected with the support chain (2) for straining supporting track (3), and sampling detection gun (4) is connected on supporting track (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520897284.9U CN205192809U (en) | 2015-11-11 | 2015-11-11 | System for flue gas NO of thermal power plant and mercury are sampled simultaneously and are detected |
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|---|---|---|---|
| CN201520897284.9U CN205192809U (en) | 2015-11-11 | 2015-11-11 | System for flue gas NO of thermal power plant and mercury are sampled simultaneously and are detected |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105300744A (en) * | 2015-11-11 | 2016-02-03 | 华能国际电力股份有限公司 | System for simultaneously sampling and detecting flue gas NO and mercury |
| CN107462532A (en) * | 2017-08-02 | 2017-12-12 | 东南大学 | A kind of method for carrying out gas mercury measurement of concetration using modified high sulfur petroleum coke |
| CN107655727A (en) * | 2017-10-25 | 2018-02-02 | 天津大学 | Mercury species device and its method for sampling in integral collecting measure air |
-
2015
- 2015-11-11 CN CN201520897284.9U patent/CN205192809U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105300744A (en) * | 2015-11-11 | 2016-02-03 | 华能国际电力股份有限公司 | System for simultaneously sampling and detecting flue gas NO and mercury |
| CN105300744B (en) * | 2015-11-11 | 2018-07-31 | 华能国际电力股份有限公司 | A kind of system of coal steam-electric plant smoke NO and mercury sampling and detection simultaneously |
| CN107462532A (en) * | 2017-08-02 | 2017-12-12 | 东南大学 | A kind of method for carrying out gas mercury measurement of concetration using modified high sulfur petroleum coke |
| CN107655727A (en) * | 2017-10-25 | 2018-02-02 | 天津大学 | Mercury species device and its method for sampling in integral collecting measure air |
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