CN206848241U - A kind of on-line monitoring system of coal fired thermal power plant mercury emissions thing - Google Patents

Abstract

The utility model discloses a kind of on-line monitoring system of coal fired thermal power plant mercury emissions thing, it is characterised in that including：Flue, the sampling gun for being arranged at the flue front end, and it is successively set on adsorbent equipment, dehydrating unit, mass flowmenter, barometer, sampling pump and the sample analyser of flue rear end, wherein, sampling gun is suitable to the flue gas of collection coal fired thermal power plant；Flue is suitable to conveying flue gas, and compressed air inlet is provided with flue, so that compressed air blowback enters flue；Adsorbent equipment is suitable to the sulfide in absorption flue gas, and it is activated carbon fiber absorber, and has metal ion by the solution dipping back loading containing metal ion；Mass flowmenter and air pressure meter are suitable to flow and air pressure in monitoring flue respectively；Sampling pump is suitable to flow velocity of the control flue gas in flue；And sample analyser is suitable to test and analyze the mercury content in flue gas.

Description

A kind of on-line monitoring system of coal fired thermal power plant mercury emissions thing

Technical field

The flue gas inspection field of coal-fired flue-gas is the utility model is related to, more particularly to a kind of coal fired thermal power plant mercury emissions thing On-line monitoring system.

Background technology

At present, growing with Chinese society's economy, problem of environmental pollution is increasingly severe, ring caused by mercury emissions Border pollution is also gradually more and more paid attention to.Mercury can pass through air and river and ocean current two media long range in the environment Transmission, and there is remote settling characteristics, make the local discharge of mercury to cause transboundary to pollute, turn into matter of regional significance, even Whole global environment is impacted, causes global contact scar.Mercury is very volatile, and is easily absorbed by skin, aoxidizes in vivo Into toxic compounds, so as to influence health.

According to statistics, the mercury total amount that the whole world is discharged into air every year is about 5000t, wherein mercury caused by artificial is about 4000t, and because the discharge capacity of mercury caused by coal burning accounts for more than 30%.China is coal consumption maximum in the world State, coal-fired industry account for the 75% of domestic production of energy total amount, and compared with other countries, the low halogen of the high mercury of coal in China, technology water Flat also not perfect enough, coal-fired industry is the mercury emissions source of Largest In China, accounts for more than the 50% of In The Atmosphere Over China mercury emissions total amount.And with The increase of coal-burning power plant of China quantity, mercury emission is in ascendant trend year by year.China's power plant soot amount in 2005 is 1,000,000,000 tons, The mercury discharged into air is 150t.Coal consumption total value is 3,000,000,000 tons within 2009, wherein 50% coal is used for coal-burning power plant.

The discharge of mercury comes from two parts of natural source and artificial source, and wherein artificial source is the main source of mercury in air, Constitute about the 75% of total release.Mercury emissions in air are mostly derived from the burning of combustion of fossil fuel, especially coal, and fire Coal-fired plant is the maximum source of global mercury emissions in air.Research shows that the mercury of whole world coal-burning power plant discharge accounts for mercury emissions The 26% of total amount.And power plants mercury emissions monitoring technology is still not mature enough at present, it is therefore desirable to a kind of more effective mercury Discharge object detecting method.

Utility model content

Therefore, the utility model provides a kind of on-line monitoring system of coal fired thermal power plant mercury emissions thing, to try hard to solve or Person at least alleviates the problem of existing above.

According to one side of the present utility model, there is provided a kind of on-line monitoring system of coal fired thermal power plant mercury emissions thing, its It is characterised by, including：Flue, the sampling gun for being arranged at the flue front end, and it is successively set on the fume pipe Adsorbent equipment, dehydrating unit, mass flowmenter, barometer, sampling pump and the sample analyser of road rear end, wherein, sampling gun is fitted In the flue gas of collection coal fired thermal power plant；Flue is suitable to conveying flue gas, and is provided with compressed air on the flue and enters Mouthful, so that compressed air blowback enters flue；Adsorbent equipment is suitable to the sulfide in absorption flue gas, and it inhales for NACF Adsorption device, and have metal ion by the solution dipping back loading containing metal ion；Mass flowmenter and air pressure meter are fitted respectively Flow and air pressure in monitoring flue；Sampling pump is suitable to flow velocity of the control flue gas in flue；And sample point Analyzer is suitable to test and analyze the mercury content in flue gas.

Alternatively, according in on-line monitoring system of the present utility model, in addition to compressed air piping, it is arranged on compression At air intake, flue includes the first flue and the second flue, first and second flue and compressed air hose Road is connected at compressed air inlet by triple valve.

Alternatively, according in on-line monitoring system of the present utility model, in addition to：It is arranged on compressed air piping First magnetic valve, opening and closing suitable for control compressed air piping；And it is arranged on the second electromagnetism before adsorbent equipment Valve and the 3rd magnetic valve being arranged between sampling pump and sample analyser, opening and closing suitable for control flue.

Alternatively, according in on-line monitoring system of the present utility model, the first magnetic valve is closed type, second and the 3rd Magnetic valve is open type.

Alternatively, also include according in on-line monitoring system of the present utility model：Temperature monitor and humidity detection instrument, It is respectively adapted to monitor the temperature and humidity of flue gas by multiple monitoring points on flue.

Alternatively, according in on-line monitoring system of the present utility model, multiple monitoring points on flue include position In the first temperature measuring point before compressed air inlet, the second temperature measuring point and the first hygrometric between adsorbent equipment and dehydrating unit Point, and the 3rd temperature measuring point and the second hygrometric point between dehydrating unit and mass flowmenter.

Alternatively, according in on-line monitoring system of the present utility model, in addition to control system, mass flowmenter, gas Pressure meter, temperature monitor, data transmission interface is provided with humidity detection instrument, for the data detected to be transferred into control System.

Alternatively, according in on-line monitoring system of the present utility model, the inside of sampling gun is network structure, and is installed additional There is replaceable filter core；Flue uses compound heat tracing spool；Adsorbent equipment includes wind inlet section, carbon fiber filter section and air-out Section, carbon fiber filter section include multiple filter vats；Dehydrating unit uses double-channel gas condenser, and it has two identicals only It is vertical to remove wet channel, suitable for smoke moisture is controlled in the range of 5%-20%；And sampling pump is suitable in control flue Flue gas flow be 1.5~2.0L/min.

Alternatively, according in on-line monitoring system of the present utility model, sampling gun extend into the flue of coal fired thermal power plant In, the interface of the flue and flue is provided with sealing flange, suitable for fixed flue and seals the interface.

Alternatively, according in on-line monitoring system of the present utility model, the solution containing metal ion is MgCl₂、 MnCl₂、CoCl₂、CuCl₂And NiCl₂At least one of.

Brief description of the drawings

In order to realize above-mentioned and related purpose, some illustrative sides are described herein in conjunction with following description and accompanying drawing Face, these aspects indicate the various modes that can put into practice principles disclosed herein, and all aspects and its equivalent aspect It is intended to fall under in the range of theme claimed.Read following detailed description in conjunction with the accompanying drawings, the disclosure it is above-mentioned And other purposes, feature and advantage will be apparent.Throughout the disclosure, identical reference generally refers to identical Part or element.

Fig. 1 shows the on-line monitoring system of the coal fired thermal power plant mercury emissions thing according to the utility model one embodiment 100 schematic diagram；And

Fig. 2 shows the schematic diagram of the sample analyser 180 according to the utility model one embodiment.

Embodiment

The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although the disclosure is shown in accompanying drawing Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here Limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure Completely it is communicated to those skilled in the art.

Fig. 1 shows the on-line monitoring of the coal fired thermal power plant mercury emissions thing according to one exemplary embodiment of the utility model The schematic diagram of system 100.As shown in figure 1, on-line monitoring system 100 includes flue 110, is arranged at the flue 110 The sampling gun 120 of front end, and it is successively set on the adsorbent equipment 130, dehydrating unit 140, quality stream of the rear end of flue 120 Gauge 150, barometer 160, sampling pump 170 and sample analyser 180.

Sampling gun 120 is suitable to the flue gas of collection coal fired thermal power plant, and it passes through the walling of flue 117 of coal fired thermal power plant and extend into In the flue of coal fired thermal power plant.

According to one embodiment, sampling gun 120 can use Nanhua NHA-506 sampling guns, so as to effectively collect Flue gas.During sampling, due to containing flyash ingredient in flue gas, plus the network structure set by the inside of sampling gun 120, Easily cause to block during flue gas sampling.In order to avoid such situation, can install one additional in sampling gun 120 can Filter core is replaced, for filtering out the flying dust that may cause to block.

Flue 110 is suitable to conveying flue gas, and is provided with compressed air inlet on flue 110, so that compression is empty Gas blowback enters flue.Further, flue 110 includes the first flue 111 and the second flue 112, and And the two flues are connected by triple valve 113, the three-terminal link compressed air piping 190 of triple valve 113, such three Port valve is regarded as compressed air inlet in the breach of the cambered surface of flue 110.

In order to reduce the maintenance cost of system as far as possible, add air compressor can effectively anti-locking system obstruction, if going out Congestion situations are showed, compressed air inlet can be opened, blowback cleaning is carried out to whole flow process.Wherein, compressed air is by power plant The air compressor carried provides, therefore can effectively reduce the cost of manual maintenance, reduces unnecessary specific responsibility personnel Set.

According to one embodiment, can also include in system 100：The first electromagnetism being arranged on compressed air piping 190 Valve 114, opening and closing suitable for control compressed air piping 190；The second solenoid valve being arranged on before adsorbent equipment 130 115 and the 3rd magnetic valve 116 that is arranged between sampling pump 170 and sample analyser 180, suitable for controlling flue 110 Open and close.Wherein, the first magnetic valve 114 is closed type, second and the 3rd magnetic valve be open type.

Magnetic valve is arranged on before sample analyser 180, can prevent sample air pressure unexpected abnormality feelings in preprocessing process Condition, cause high pressure rush in sample analyser 180 and analysis on damage instrument.Here it is possible to from 3V308NCB closed type models Magnetic valve uses in blowback entrance, and two 3V308NOB normal-open electromagnetic valves are separately positioned on ACF devices and sample analyser 180 Overvoltage is prevented before.The first magnetic valve 114 is controlled to realize time opening and closing using the time relay of control system PLC Function, regularly blowback is carried out to flue 110, so as to avoid its interior dust wall built-up or even block.

In addition, being provided with sealing flange 118 in the walling of flue 117 of coal fired thermal power plant and the interface of flue 110, fit In fixed flue 110 and seal the interface.

According to one embodiment, flue 110 can use compound heat traced pipeline, such as use the compound companion of KVB-FE2 types Hot pipeline.Heat tracing sampling multiple tube is the important component in environmentally friendly flue gas on-line monitoring monitoring system, and it is high by one group of corrosion resistant Performance tetrafluoroethene conduit is aided with high-temperature constant-power ribbon heater or self-temperature-limiting heating strip and compensation cable composition inner core, adds outside Mouth raw material heat-insulation layer, is finally coated with polyethylene (PE) or polyvinyl chloride (PVC) protection overcoat is combined.

Adsorbent equipment 130 is suitable to the sulfide in absorption flue gas, and it is NACF ACF adsorbent equipments, and by containing The solution dipping back loading for having metal ion has metal ion, namely processing is modified to ACF.ACF is modified and changed Become the degree of roughness on ACF surfaces and the diameter in hole, and carry corresponding functional group, using carrying metal ion in system 100 Method is modified to ACF.

Loaded metal ion makes adsorbate adsorb on ACF surfaces, and using ACF reproducibility, metal ion is reduced into list The ion of matter or lower valency, by the metal ion adhesion stronger to adsorbate, so as to increase ACF absorption property.It is different Metal its activity it is different, the metal favourable to desulfurization mainly has：Mg²⁺、Zn²⁺、Cu²⁺、Ag⁺、Ni⁺Deng.With the side of metal impregnation Method prepares a series of adsorbents, and the active of ACF is sequentially after dipping：Cu>N>Co>Cr.After gas ions modified ACFs, ACF surfaces Oxygen-containing functional group significantly increases.

With metal chloride solutions such as MgCl₂、MnCl₂、CoCl₂、CuCl₂And NiCl₂Modified ACFs carry out desulfurization, gold-supported ACF desulfurized effects after category ion are all improved, Co²⁺Modified ACF desulfurized effects are best, due to modified active site concentration Increase, in stable state, desulfuration efficiency is up to 89%, but the position about active sites does not determine also.SO₂Absorption on ACF Mechanism, it is believed that be ACF at normal temperatures SO₂It is oxidized to SO₃, then it is hydrated into H₂SO₄, H₂SO₄Overflowed from ACF surfaces, it is complete Into ACF to SO₂Absorption.

The main purpose of adsorbent equipment 130 is to reduce the content of sulfur dioxide in fume sample, while mercury during guarantee Content it is constant.Its less reason of influence degree to mercury concentration mainly has following three points：(1) ACF desulfurization belongs to dry method and taken off Sulphur, traditional wet desulphurization can dissolve more than 90% dimercurion, and compared to conventional method, ACF contained humidities are less, because This largely reduces the loss of mercury；(2) due to the method for modifying using carrying metal ion, according to the reaction machine of mercury The loss that mercury can not be reduced with the metal ion of mercury reaction is carried in reason, selection；(3) because catalytic activity is higher, cause main Sulfuric acid is converted into quickly with the inferior sulfate radical of dimercurion reaction, is reduced mercury and the probability of inferior sulfate radical reaction, is reduced The loss of mercury.

According to one embodiment, wind inlet section, carbon fiber filter section and wind outlet section are divided in the absorption tower of adsorbent equipment 130.Filtering Section is made up of several to dozens of cartridge filters, and organic exhaust gas enters casing from wind inlet section, via filter cylinder adsorption cleaning, after purification Air is discharged into air by ventilation blower, and the carbon fiber filter cylinder after saturation takes out regeneration, and the cartridge filter after regeneration still can be after after installing It is continuous to use.Active carbon fiber felt is a kind of new and effective sorbing material, has higher suction-operated to toxic and harmful gas, is inhaled It is fast to echo desorption rate, carbon fiber felt preferably uses (105 DEG C) of hot-air to be desorbed and can recycle, with more the corrosion resistant for not being afraid of carbon alkali Corrosion energy, to containing the organic exhaust gas such as benzene homologues, sulfur dioxide, carbon monoxide, nitrogen oxides, hydrogen sulfide and oil gas, stench, All there is obvious clean-up effect.

Dehydrating unit 140 can use what ECM type double-channel gas condensers have two identical independence remove wet channel, this Device can effectively control the humidity of sample, by the humid control of sample in 5%-20% required scope.

Mass flowmenter 150 and barometer 160 are respectively adapted to monitor the flow and air pressure in flue.Wherein, quality Flowmeter 150 can use EL-FLOW select series mass flowmeters, possess the designed PC plate of specialized laboratories application Modular construction.Control valve can be integral or split, be provided convenience for operation and maintenance.

Sampling pump 170 is suitable to flow velocity of the control flue gas in flue 110.Sample flow designed by system 100 is 1.5~2.0L/min, from sampling gun 120 to about 70 meters of sampling pipes sample analyser 180, therefore miniature adopt can be obtained from extra large Air pump HDP12-WZ05, external 220V power supplys, optional no load discharge 3.0L/min, 5.0L/min, 7.0L/min fully meet and are The traffic demand of system.

Sample analyser 180 is suitable to test and analyze the mercury content in flue gas, and detection data can be directly transferred to Record stocking system.Sample analyser 180 can use 30A system analysers.30A methods can realize continuous monitoring, both may be used Hg is determined respectively⁰With Hg²⁺, also can be by Hg²⁺It is converted into Hg0 and determines total amount together.Measurement result is more accurate, and can be real-time Output result, the time for obtaining data is substantially reduced, is easy to environmental administration to monitor pollution sources in real time.But what is measured is The concentration of total gaseous mercury is discharged in flue gas, it is impossible to collect particle mercury.Analyzer in the world can only analyze Hg0 at present, therefore The analysis object of all analysis methods is all Hg0, the Hg in flue gas²⁺And it is converted into Hg0 and is analyzed.30A can be surveyed directly Target contaminant mercury is measured, online result is provided in time, and tracks variation of valence of the mercury in flue, and can be also used for optimizing Power plant's mercury pollution control technology system, it is convenient to control mercury emissions.

Fig. 2 shows the schematic diagram of the sample analyser 180 according to the utility model one embodiment, as shown in Fig. 2 sample Product analyzer 180 includes hot filtration apparatus 181, heating sample transfer line 182, converter 183 along flue gas transmission direction successively With mercury analyzer 184.

Hot filtration apparatus 181 is located at the end of the second flue 112, suitable for carrying out heating and filtering to fume sample.Add Hot sample transfer line 182, is connected with hot filtration apparatus 181, suitable for the sample after transmission heating and filtering.Converter 183 and heating Sample transfer line 182 connects, suitable for the Hg in sample²⁺Converted.Mercury analyzer 184 is connected with converter 183, suitable for pair The mercury content in sample after conversion is tested and analyzed.

According to one embodiment, mercury analyzer 184 can be that the cold vapor atoms absorption spectrometry mercury of high sensitivity divides online Analyzer, and the method for application dual-beam measurement excludes the interference of other gas components as far as possible, and ensure that in SO₂Concentration is small In 500mg/m³When measurement result greatly improved compared to single beam measuring accuracy.Its sampling probe carried can be periodically anti- Blow, significantly reduce the maintenance cost of sample analysis unit.

In addition, according to on-line monitoring system 100 of the present utility model, temperature monitor and humidity detection instrument can also be included (being to show in figure), it is respectively adapted to monitor the temperature and humidity of flue gas by multiple monitoring points on flue 110.Figure Represent humidity detection point with grey round dot in 1, black round dot represents temperature monitoring point, specifically include before compressed air inlet One temperature measuring point, the second temperature measuring point and the first hygrometric point between adsorbent equipment 130 and dehydrating unit 140, and positioned at except The 3rd temperature measuring point and the second hygrometric point between wet device 140 and mass flowmenter 150.

According to one embodiment, temperature monitor can use Omron E5CD, and use and be equipped with " suitable solution skill The E5CD series of art ", the technology can perform adjust automatically, to ensure that temperature control is at one's best all the time.Humidity detection Instrument can select SSD-100 type smoke moisture monitors, built-in high-accuracy capacitor type digital hygro sensor, there is feeler lever at present A kind of structure type of the independently installed formula of formula.

In addition, system 100 can also include control system (not shown), control system can use SIEMENS PLC Control system, programmable controller is employed according to the needs of modern production, with reference to the specimen preprocessing of our designed, designeds The demand of unit is managed, selects small PLC, cost is low, cost-effective.Concrete model is CPU221 types, SIEMENS PLC autgmentability It is good, the later stage can be facilitated to extend.Moreover, the most CEMS systems that use of power plant also all use SIEMENS PLC at present, facilitate with The integration of system afterwards.

Data transfer is may be provided with mass flowmenter 150, barometer 160, temperature monitor and humidity detection instrument to connect Mouthful, for the data detected to be transferred into control system.Data can be realized by the EM231 expansion modules of SIEMENS PLC Real-time monitoring record, the data of the measuring points such as temperature, humidity, air pressure, flow are uploaded in database, it is real-time by operation screen Numerical value is shown, and historical data can be checked in historical data picture, facilitates PLC Collaborative Controls.For example, in order to prevent pipe Hypertonia Failure analysis instrument, PLC pass through pressure-measuring-point in sampling line caused by maloperation or other reasonses when road purges Pressure value in monitoring sampling line in real time, when pressure value is more than 0.1MP, overpressure protection magnetic valve energized action, cut-out sampling Pipeline, hypertonia Failure analysis instrument is avoided, when dropping to below 0.09MP etc. pressure value, overpressure protection magnetic valve dead electricity, system Recover normal operation.Moreover, temperature and flow measuring point are only used as monitoring point and upload to PLC in system, PLC controls are not involved in, are subtracted Lack the use of PLC expansion modules, greatly save cost.

According to the technical solution of the utility model, by set flue 110, sampling gun 120, compressed air inlet, Modified ACFs adsorbent equipment, dehydrating unit 140, mass flowmenter 150, barometer 160 and 30A testing and analysis systems, can be accurate And quickly realize the mercury emissions analyte detection of coal fired thermal power plant.Moreover, modified ACF adsorbent equipments use dry desulfurization, both The content of sulfur dioxide in fume sample can be reduced, the content of mercury is constant during and can ensures；And due to golden using carrying Belong to the method for modifying of ion, according to the reaction mechanism of mercury, the damage that mercury can not be reduced with the metal ion of mercury reaction is carried in selection Lose；Further, since catalytic activity is higher, therefore mainly the inferior sulfate radical with dimercurion reaction is converted into sulfuric acid quickly, subtracts Mercury and the probability of inferior sulfate radical reaction are lacked, so as to reduce the loss of mercury.It was verified that the system can realize the annual moment Monitoring to the mercury of coal fired thermal power plant, and it is simple to operate, operation maintenance is simple, reduce later maintenance expense and labour cost Input.Authentic data is provided for the monitoring of mercury, is taken measures so as to be advantageous to the relevant personnel, lifts environmental quality, is protected Hinder the health of people.

Further, the mercury emissions thing of thermal power plant after accurate measurements, can be effectively improved environmental consciousness and the society of enterprise Can the sense of duty, on the other hand also contribute to country improve environmental quality assessment work scientific level, put into effect corresponding standard with Policy, strengthen the monitoring to power industry mercury emissions, strengthen the protection to environmental quality, and also help thermal power plant for certainly The improvement of the production equipment and the mode of production of body provides valid data.

In the specification that this place provides, numerous specific details are set forth.It is it is to be appreciated, however, that of the present utility model Embodiment can be put into practice in the case of these no details.In some instances, known side is not been shown in detail Method, structure and technology, so as not to obscure the understanding of this description.

Similarly, it will be appreciated that in order to simplify the disclosure and help to understand one or more in each utility model aspect Individual, in the description to exemplary embodiment of the present utility model above, each feature of the present utility model is divided together sometimes Group is into single embodiment, figure or descriptions thereof.However, the method for the disclosure should be construed to reflect following meaning Figure：The requires of the utility model i.e. claimed is than the feature more features that is expressly recited in each claim.More Exactly, as the following claims reflect, it is to be less than single reality disclosed above in terms of utility model Apply all features of example.Therefore, it then follows thus claims of embodiment are expressly incorporated in the embodiment, Wherein each claim is used as separate embodiments of the present utility model in itself.

Those skilled in the art should be understood the module or unit or group of the equipment in example disclosed herein Part can be arranged in equipment as depicted in this embodiment, or alternatively can be positioned at and the equipment in the example In different one or more equipment.Module in aforementioned exemplary can be combined as a module or be segmented into addition multiple Submodule.

Those skilled in the art, which are appreciated that, to be carried out adaptively to the module in the equipment in embodiment Change and they are arranged in one or more equipment different from the embodiment.Can be the module or list in embodiment Member or component be combined into a module or unit or component, and can be divided into addition multiple submodule or subelement or Sub-component.In addition at least some in such feature and/or process or unit exclude each other, it can use any Combination is disclosed to all features disclosed in this specification (including adjoint claim, summary and accompanying drawing) and so to appoint Where all processes or unit of method or equipment are combined.Unless expressly stated otherwise, this specification (including adjoint power Profit requires, summary and accompanying drawing) disclosed in each feature can be by providing the alternative features of identical, equivalent or similar purpose come generation Replace.

In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments In included some features rather than further feature, but the combination of the feature of different embodiments means in this practicality newly Within the scope of type and form different embodiments.For example, in the following claims, embodiment claimed One of any mode can use in any combination.

In addition, be described as herein can be by the processor of computer system or by performing for some in the embodiment The method or the combination of method element that other devices of the function are implemented.Therefore, have and be used to implement methods described or method The processor of the necessary instruction of element forms the device for implementing this method or method element.In addition, device embodiment Element described in this is the example of following device：The device is used to implement by order to implement the element of the purpose of utility model institute The function of execution.

As used in this, unless specifically stated so, come using ordinal number " first ", " second ", " the 3rd " etc. Description plain objects are merely representative of the different instances for being related to similar object, and are not intended to imply that the object being so described must Must have the time it is upper, spatially, in terms of sequence or given order in any other manner.

Although describing the utility model according to the embodiment of limited quantity, above description, this technology are benefited from It is in field it is clear for the skilled person that in the scope of the utility model thus described, it can be envisaged that other embodiments.In addition, It should be noted that the language used in this specification primarily to readable and teaching purpose and select, rather than in order to Explain or limit theme of the present utility model and select.Therefore, without departing from the scope and spirit of the appended claims In the case of, many modifications and changes will be apparent from for those skilled in the art.For this The scope of utility model, the disclosure done to the utility model are illustrative and not restrictive, the scope of the utility model It is defined by the appended claims.

Claims (10)

1. A kind of 1. on-line monitoring system of coal fired thermal power plant mercury emissions thing, it is characterised in that including：Flue, it is arranged at this The sampling gun of flue front end, and it is successively set on the adsorbent equipment, dehydrating unit, quality stream of the flue rear end Gauge, barometer, sampling pump and sample analyser, wherein,

   The sampling gun is suitable to the flue gas of collection coal fired thermal power plant；

   The flue is suitable to conveying flue gas, and is provided with compressed air inlet on the flue, for compressed air Blowback enters the flue；

   The adsorbent equipment is suitable to the sulfide in absorption flue gas, and it is activated carbon fiber absorber, and by containing metal The solution dipping back loading of ion has metal ion；

   Mass flowmenter and the air pressure meter is suitable to flow and air pressure in monitoring flue respectively；

   The sampling pump is suitable to flow velocity of the control flue gas in flue；And

   The sample analyser is suitable to test and analyze the mercury content in flue gas.
2. 2. on-line monitoring system as claimed in claim 1, it is characterised in that also including compressed air piping, be arranged on described At compressed air inlet, the flue includes the first flue and the second flue, first and second flue Connected with the compressed air piping at compressed air inlet by triple valve.
3. 3. on-line monitoring system as claimed in claim 2, it is characterised in that also include：

   The first magnetic valve being arranged on the compressed air piping, suitable for controlling opening and closing for the compressed air piping Close；And

   Second solenoid valve before being arranged on the adsorbent equipment and it is arranged between the sampling pump and sample analyser 3rd magnetic valve, suitable for controlling opening and closing for the flue.
4. 4. on-line monitoring system as claimed in claim 3, it is characterised in that first magnetic valve is closed type, described Two and the 3rd magnetic valve is open type.
5. 5. on-line monitoring system as claimed in claim 1, it is characterised in that also include：

   Temperature monitor and humidity detection instrument, it is respectively adapted to monitor the temperature of flue gas by multiple monitoring points on flue And humidity.
6. 6. on-line monitoring system as claimed in claim 5, it is characterised in that

   Multiple monitoring points on the flue include the first temperature measuring point before compressed air inlet, positioned at the absorption The second temperature measuring point and the first hygrometric point between device and dehydrating unit, and positioned at the dehydrating unit and mass flowmenter it Between the 3rd temperature measuring point and the second hygrometric point.
7. 7. on-line monitoring system as claimed in claim 5, it is characterised in that also including control system, the mass flowmenter, Barometer, temperature monitor, data transmission interface is provided with humidity detection instrument, for the data detected to be transferred into institute State control system.
8. 8. on-line monitoring system as claimed in claim 1, it is characterised in that

   The inside of the sampling gun is network structure, and adds replaceable filter core；

   The flue uses compound heat tracing spool；

   The adsorbent equipment includes wind inlet section, carbon fiber filter section and wind outlet section, and the carbon fiber filter section includes multiple filterings Bucket；

   The dehydrating unit uses double-channel gas condenser, and it has two identical independent humidity control passages, suitable for by flue gas Humid control is in the range of 5%-20%；And

   It is 1.5~2.0L/min that the sampling pump, which is suitable to control the flue gas flow in the flue,.
9. 9. on-line monitoring system as claimed in claim 1, it is characterised in that the sampling gun extend into the cigarette of coal fired thermal power plant In road, the interface of the flue and the flue is provided with sealing flange, suitable for the fixation flue and sealed The interface.
10. 10. on-line monitoring system as claimed in claim 1, it is characterised in that

    The solution containing metal ion is MgCl₂、MnCl₂、CoCl₂、CuCl₂And NiCl₂At least one of.