CN103472061B - The on-line measuring device of sulfur trioxide and method in a kind of flue gas - Google Patents
The on-line measuring device of sulfur trioxide and method in a kind of flue gas Download PDFInfo
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- CN103472061B CN103472061B CN201310376879.5A CN201310376879A CN103472061B CN 103472061 B CN103472061 B CN 103472061B CN 201310376879 A CN201310376879 A CN 201310376879A CN 103472061 B CN103472061 B CN 103472061B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
- G01N33/0013—Sample conditioning by a chemical reaction
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—Specially adapted to detect a particular component
- G01N33/0042—Specially adapted to detect a particular component for SO2, SO3
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Abstract
The on-line measuring device and the method that the invention discloses sulfur trioxide in a kind of flue gas, device comprises smoke collecting unit; Gas-liquid separator, for by the SO of the flue gas from flue gas sampling unit3Be condensed into sulfuric acid droplets with gas phase separation; Vapor detection unit, for measuring the gas phase flow rate from described gas-liquid separator; The first NaOH solution tank NaOH, for providing absorption liquid to form mixed liquor to mix described sulfuric acid droplets to described gas-liquid separator; Liquid phase detecting unit, for measuring the SO having transformed from the mixed liquor of described gas-liquid separator3Quality; Digital control unit, for calculating flue gas SO according to the testing result of described vapor detection unit and liquid phase detecting unit3Concentration. The present invention has realized SO in flue gas3On-line measurement, to the SO in flue gas3Sample, and analyze SO3Content, be convenient to coal-burning power plant and take corresponding measure, control SO in flue gas3Content, reduces the corrosion to flue and equipment thereof, reduces to greatest extent boiler exhaust gas heat loss simultaneously.
Description
Technical field
The present invention relates to smoke gas treatment technical field, be specifically related to the online of sulfur trioxide in a kind of flue gasCheckout gear and method.
Background technology
The SO of thermal power plant at present3Although discharge capacity little, due to SO3Very easily with flue gas in water steamThe depressed formation sulfuric acid vapor that closes, condenses on the heating surface at wall temperature lower than acid dew point, causes acid dew point corruptionErosion. SO in flue gas3, the more, acid dew-point temperature is higher for content, and corrosion scope is more serious.In recent years the increasing Installation in Plant of China wet process of FGD, due to clean flue gas after wet desulphurizationHumidity larger, remaining SO in flue gas3Very easily rapid conversion is sulfuric acid droplet, to flue and downstreamEquipment causes heavy corrosion. SO in waste gas3When concentration is low to moderate 5-10ppm, because hot flue gases existsIn atmosphere compared with cooling in cold air and produce white, purple or black feathering.
Selective catalytic reduction reaction (selectivecatalyticreactor, SCR) be in power plant forControl NOxThe measure of discharging and adopt, is adding NH3Situation under, SCR is by NOxBe reduced toN2, but also can cause a small amount of SO2Be converted into SO3Although, SO3Now concentration is not high, but dischargeTime can produce the secondary feathering of highly-visible.
For solving targetedly acid dew piont corrosion problem, SO in flue gas need to understand in power plant3Concentration,Not yet find that at present flue gas analyzer has mensuration SO3This function of content, this is mainly due to SO3Being transferred in apparatus measures terminal procedures and can condensing or adhere to the form of sulfuric acid vapor or sulfuric acid mistOn transmission pipeline, cause sampling error and the strong corrosion to instrument.
It is right in " in Concentration in Fixed Pollutants Source, particle is measured and the gaseous contaminant method of sampling ", to have proposedThe measurement of solid particulate matter in flue gas, and do not consider SO3Deng the measurement of liquid particles thing. In fact,SO3In flue gas, concentration of emission can reach 10mg/m3Above, SO after SCR denitration3Concentration can reach30～80mg/m3, become the subject matter of current coal-burning power plant fine particles pollution.
Develop in the art multiple for measuring flue gas SO3The technology of concentration. The patent No.Be that 200620163937.1 novel practical patent discloses SO in a kind of flue gas3Sampling apparatus, bagDraw together dedusting mechanism, sampling pipe, spiral collecting pipe and aspirating mechanism, wherein dedusting mechanism is arranged on samplingThe arrival end of pipe, the port of export of this sampling pipe is connected with the import of spiral collecting pipe by pipeline, spiralThe import and export of collecting pipe is all positioned at spiral upper end, and it exports by silica gel hose and described suctionMechanism communicates. In patent, without measure portion, and cannot realize on-line measurement.
The patent No. be 20091021169.1 patent of invention disclose a kind of for detection of, measure and controlSO in flue gas processed3With the method and apparatus of other condensables, can measure multiple condensablesConcentration, but the method is high for material required precision, cannot realize the measurement of on-line continuous. In U.S.State, discloses a kind of SO in the patent No. 2011/00978093Measuring method, precision is higher, but shouldDevice carries inconvenience, is applicable to laboratory operation.
Summary of the invention
The invention provides on-line measuring device and the method for sulfur trioxide in a kind of flue gas, to analyze cigaretteSO in gas3Content, realized SO in flue gas3On-line measurement, have simple in structure, be convenient to takeThe features such as band.
An on-line measuring device for sulfur trioxide in flue gas, comprises flue gas sampling unit, also comprises:
Gas-liquid separator, for by the SO of the flue gas from flue gas sampling unit3Be condensed into sulfuric acid liquidDrip with gas phase separation;
Vapor detection unit, for measuring the gas phase flow rate from described gas-liquid separator;
The first NaOH solution tank NaOH, for providing absorption liquid to mix described sulfuric acid liquid to described gas-liquid separatorDrip and form mixed liquor;
Liquid phase detecting unit, has transformed from the mixed liquor of described gas-liquid separator for measuringSO3Quality;
Digital control unit, for tying according to the detection of described vapor detection unit and liquid phase detecting unitFruit is calculated SO in flue gas3Concentration.
Described gas-liquid separator can adopt multiple implementation, in the present invention, and as preferably,
Described gas-liquid separator is several serpentine condensers parallel with one another, the entering of this serpentine condenserMouth is connected with described flue gas sampling unit and the first NaOH solution tank NaOH by corresponding pipeline and valve, this snakeThe outlet of shape condenser pipe is by corresponding pipeline and valve and vapor detection unit and liquid phase detecting unitBe connected.
For convenience of the separation of gas phase, further preferred, described vapor detection unit and corresponding snakelike condensationBetween the outlet of pipe, be provided with air pump, for by the gas suction vapor detection list of described serpentine condenserIn unit. The negative pressure producing by this air pump makes the gas in corresponding serpentine condenser separate and pass through gas phaseDetecting unit metering.
Serpentine condenser, the first NaOH solution tank NaOH, vapor detection unit, corresponding valve and liquid phase detecting unitForm SO3Detecting unit, flue gas sampling unit continuous acquisition flue gas to be measured, then enters snakelike condensationPipe because temperature in condenser pipe is lower than sulphuric acid dew point, forms sulfuric acid droplets in coiled pipe, thereby willSO3Separate with flue gas, sampling finishes to add absorption liquid in backward coiled pipe, forms sulfuric acid droplets（SO4 2-), the solution in coiled pipe is sent into liquid phase detecting unit and is detected, and first adds barium salt solution,After stirring, form precipitation, by optical system detection SO4 2-Concentration, SO3Detecting unit is by gas-liquid two-phaseDetection information sends to digital control unit, receives and calculates in flue gas to be measured by digital control unitSO3Content.
Further preferably, be also provided with one for the thermostatic chamber of described serpentine condenser is installed. Controlling shouldThermostatic chamber temperature is 60-80 DEG C.
Further preferably, the diameter of described serpentine condenser is 8-15cm.
At SO3In detecting unit, in thermostatic chamber, serpentine condenser is by the flue gas from flue gas sampling unitCarry out condensation, isolate the SO in flue gas3, its flue gas flow is by vapor detection unit inspection.
Described gas-liquid separator can be several serpentine condensers parallel with one another, serpentine condenser itBetween mutually alternation, as a preferred technical solution of the present invention, described gas-liquid separator is twoIndividual serpentine condenser parallel with one another.
In device, be provided with and two corresponding by-pass valve controls of serpentine condenser, for a snakelike condensationAfter finishing, pipe sampling replaces. After one of them serpentine condenser collection finishes, in this coiled pipeAdd absorption liquid, the SO in flue gas to be measured3The final SO that forms4 2-Be present in liquid phase mixed liquor, by liquidPhase detecting unit detects SO4 2-Amount.
Vapor detection unit comprises flowmeter, thermometer and barometer, record simultaneously gas phase temperature andPressure information.
Liquid phase detecting unit is for detection of SO in flue gas3Content, a kind of preferred technical scheme, described inLiquid phase detecting unit comprises:
The reactor being communicated with the outlet of described serpentine condenser;
The second air pump being connected with the entrance of described serpentine condenser, for by described serpentine condenserMixed liquor be pressed into reactor;
For detect the light source of light to described reactor transmitting;
For receiving photometer, this photometer and the digital control list of the transmitted light that sees through described reactorUnit's communication connection.
Further preferably, be also provided with the second NaOH solution tank NaOH being connected with described reactor by liquid pump, instituteState reactor with magnetic stirring apparatus.
In NaOH solution tank NaOH, splendid attire is by energy and SO4 2-React and generate coloured ion or precipitationMaterial, for example, can be barium salt, from the material in liquid phase and reactor in gas-liquid separatorReaction is then launched detection light in reactor, through being received by photometer after the liquid in reactor,The information of reception is sent to digital control unit by photometer, calculates SO by digital control unit3'sAmount.
Preferably, the barium salt in described liquid phase detecting unit NaOH solution tank NaOH be barium chloride, chloranilic acid barium orBarium perchlorate.
Flue gas sampling unit contains SO in order to continuous acquisition3Flue gas, send into SO3In detecting unit,With regard to sampling unit itself, can be existing sampling mechanism, in the present invention, preferred as oneTechnical scheme, described flue gas sampling unit comprise successively the gas sampling gun head that is communicated with, filter chamber andFlue gas sampling pipe, the tail end of described flue gas sampling pipe is connected with described gas-liquid separator, described filtrationThe indoor filter that is provided with.
In order to ensure the temperature of flue gas to be measured, make the SO in flue gas3All exist with gaseous state, excellentSelection of land, described flue gas sampling pipe peripheral hardware is useful on the heater that keeps temperature in flue gas sampling pipe, instituteState heater and be provided with insulation skin outward.
Described heater is preferably the electric heater unit of winding outside flue gas sampling pipe, in order to heatingFlue gas to be measured in flue gas sampling pipe.
Flue gas sampling pipe is the steel pipe that rush-resisting material is made, and the outer winding electric heater unit of steel pipe, in order to addHot steel pipe temperature, makes the flue-gas temperature in steel pipe remain on 300～400 DEG C, outside electric heater unit aroundPut the insulation skin of being made by insulation material.
In order to facilitate collection and the control of flue-gas temperature, as preferably, described flue gas sampling pipe is also established outwardHave temperature collecting device, this temperature collecting device communication connection is to described digital control unit.
Preferably, described digital control unit comprises shell and is positioned at the central processing unit of shell, instituteState shell and be provided with control button and display screen.
Shell, for placing control button and display screen, control button is used for controlling whole sampling processRelevant parameter, display screen is used for showing Gas phase Smoke related parameter and test result.
Central processing unit, for receiving, control and store the data that each measurement mechanism returns, withShi Zidong calculates SO in flue gas3Concentration. This central processing unit preferably can adopt PLC controller.
The present invention also provides the on-line monitoring method of sulfur trioxide in a kind of flue gas, comprising:
(1) by flue gas sampling unit continuous acquisition flue gas to be measured, flue gas is heated up;
(2) flue gas to be measured is warming up to after 300～400 DEG C, and it is snakelike that air pump provides negative pressure that flue gas is enteredIn condenser pipe, the SO in serpentine condenser in flue gas3Be condensed into sulfuric acid droplets, remove SO3AfterFlue gas enters vapor detection unit record gas phase flow rate;
(3) condensation finishes to pass into absorption liquid in backward described serpentine condenser, with described sulfuric acid dropletsMix, form liquid phase mixed liquor, liquid phase mixed liquor enters in liquid phase detecting unit and reacts with barium salt solution,Detect the SO having transformed in liquid phase3Quality;
(4) receive the detection knot of vapor detection unit and liquid phase detecting unit by digital control unitReally, and calculate SO in flue gas3Concentration.
As preferably, the temperature of described serpentine condenser is 60-80 DEG C. This temperature is lower than sulphuric acid dew point,SO in flue gas3Be condensed into sulfuric acid droplets, separate with flue gas.
As preferably, the aqueous solution that described absorption liquid is isopropyl alcohol or water.
Beneficial effect of the present invention:
The present invention has realized SO in flue gas3On-line measurement, have simple in structure, the spy such as be easy to carryPoint, it can be to the SO in flue gas3Sample, and analyze SO3Content, be convenient to coal-burning power plantTake corresponding measure, control SO in flue gas3Content, reduces the corrosion to flue and equipment thereof, simultaneouslyReduce to greatest extent boiler exhaust gas heat loss, there is Measuring Time short, the advantage of full process automatization.
Brief description of the drawings
Fig. 1 is overall structure schematic diagram of the present invention;
Fig. 2 is smoke collecting cellular construction schematic diagram of the present invention;
Fig. 3 is SO of the present invention3The schematic diagram of detecting unit;
Fig. 4 is the structural representation of digital control unit of the present invention;
Fig. 5 is the scheme of installation of checkout gear of the present invention in smoke processing system.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described:
As shown in Figure 1, in figure, 100 is smoke collecting unit, and 200 is SO3Detecting unit, 300For digital control unit, system is made up of these three parts.
As shown in Figure 2, smoke collecting unit 100 comprise successively the gas sampling gun head 105 that is communicated with,Filter chamber 101 and sampling gun.
Sampling gun is interior outer double-layer structure, and internal layer is flue gas sampling pipe 102, for being made up of rush-resisting materialSteel pipe, at the outer heater 103 that arranges of flue gas sampling pipe 102, in present embodiment, this heatingDevice is the electric heater unit outside flue gas sampling pipe 102 around the home, guarantor is set being positioned at heater outwardTemperature skin 104, insulation outer 104 is made up of insulation material. Heater 103 and insulation outer 104Acting in conjunction, makes the flue-gas temperature in flue gas sampling pipe 102 remain on 300～400 DEG C. Flue gas samplingManage 102 afterbodys and SO3Detecting unit is communicated with.
Flue gas sampling pipe 102, detachably, is filled with in filter chamber for being threaded with filter chamber 101Silica wool, silica wool is replaceable, for filtering the soot particle of flue gas.
The exit of flue gas sampling pipe 102 arranges a temperature collecting device, for example, can be that temperature passesSensor, in order to detect exit gas temperature, and is transferred to digital control unit.
As shown in Figure 3, smoke collecting unit 100 is by pipeline and SO3Detecting unit 200 connects,The SO of present embodiment3Gas-liquid separator in detecting unit 200 be two parallel with one another snakelike coldSolidifying pipe (the first serpentine condenser 202 and the second serpentine condenser 201), two serpentine condensers are installedIn thermostatic chamber 215, the entrance of two serpentine condensers is by three-way pipeline and corresponding valve and flue gasThe afterbody outlet of sampling pipe 102 is connected with the first NaOH solution tank NaOH 212, and the outlet of two serpentine condensers is logicalCross three-way pipeline and connect gas phase pipeline and liquid phase pipeline with corresponding valve, when adopting serpentine condenser to beWhen gas-liquid separator, the outlet of serpentine condenser is not only gaseous phase outlet but also be liquid-phase outlet, by correspondenceValve control.
For the first serpentine condenser 202, control entrance and flue gas is adopted by valve V6 and valve V3Connection between sample pipe 102 and the first NaOH solution tank NaOH 212, controls outlet by valve V8 and valve V9With being connected of gas phase pipeline and liquid phase pipeline; For the second serpentine condenser 201, by valve V5 andValve V4 controls being connected between entrance and flue gas sampling pipe 102 and the first NaOH solution tank NaOH 212, by valveDoor V11 and valve V10 control outlet are connected with gas phase pipeline and liquid phase pipeline.
Between gas phase pipeline and flue gas sampling pipe 102, a pipeline also in parallel, arranges on this pipelineValve V7, for before sampling to the detection of bleeding of gas phase pipeline.
In order to facilitate the eliminating of liquid phase in serpentine condenser, second air pump 214 is also set, this is years oldTwo air pumps 214 are connected to respectively the entrance of two serpentine condensers by three-way pipeline and valve, whereinControl being connected between the second air pump 214 and the first serpentine condenser 202 entrances, valve by valve V1Door V2 controls being connected between the second air pump 214 and the second serpentine condenser 201.
Along setting gradually the first air pump 203, control valve V13 and gas phase detecting unit on gas phase pipeline204, vapor detection unit 204 comprises flowmeter, thermometer and barometer; Export along liquid phase pipelineCoupled reaction device 206, reactor 206 also has an entrance to connect successively liquid pump 210, the second solutionTank 211, reactor 206 bottoms are magnetic stirring apparatus 207, have stirrer 208 in reactor 206,A side at reactor 206 arranges light source 205, at the opposite side of reactor, photometer 209 is set,Seeing through the light of reactor 206 is absorbed by this photometer 209 and is sent to digital control unit 300. InsteadAnswer device 206 bottoms that discharge pipe is set, valve V12 is set on this discharge pipe.
SO3Detecting unit 200 also comprises that first NaOH solution tank NaOH 212, the first NaOH solution tank NaOHs 212 pass throughThree-way pipeline and valve with the entrance of a serpentine condenser is connected, at the first NaOH solution tank NaOH 212 with rightAnswer on the pipeline between serpentine condenser water pump 213 is set, water pump 213 is by the first NaOH solution tank NaOH 212Absorption liquid pump in corresponding serpentine condenser; At corresponding serpentine condenser and the first NaOH solution tank NaOH 212Pipeline is provided with the second air pump 214 and corresponding control valve thereof.
All to be connected by pipeline between upper-part.
As shown in Figure 4, digital control unit 300 is made up of shell and central processing unit 304, shellComprise display screen 302, control button 303, outer container 301. Wherein display screen 302 is for display measurementGo out SO3Result, control button 303 is for beginning and end and some parameters of control survey; InCentral processor 304, for controlling the switch of liquid pump, two air pumps and a series of valves, accepts to gather dressThe parameter of putting, central processing unit 304 and each device (temperature collecting device; In vapor detection unitFlowmeter, thermometer and barometer; Photometer; And each road valve) connect with line traffic. InSO in central processor 304 receiver gases flows and liquid4 2-Signal, draws SO in flue gas by processing3Reading, and be shown on digital display.
The course of work of apparatus of the present invention is as follows:
All valve closings before sampling. While starting to sample, open valve V7, sampling gun add hot chargingPut start heating, be heated to after 300～400 DEG C until temperature, valve-off V7, open valve V6 andValve V8, in gatherer process, keeping the flue-gas temperature to be measured in sampling gun is 300～400 DEG C, cigarette to be measuredGas enters flue gas sampling pipe 102 after filter chamber 101 filters.
Flue gas enters in thermostatic chamber (thermostatic chamber temperature is 60～80 DEG C) out from flue gas sampling pipeThe first serpentine condenser 202, the SO in flue gas3Condensation becomes sulfuric acid droplets. The first serpentine condenserThe first air pump 203 after 202, for negative pressure is provided, takes out gas from the first serpentine condenser 202Go out, control valve V13 is used for controlling gas flow, and the flowmeter in vapor detection unit 204 is for meterAmount gas flow, the flow information of its metering is fed back to digital control unit 300 by flowmeter, prepares againstCalculate SO in flue gas3Content.
The sampling time of a general coiled pipe is 5min, and the sampling time must be more than 3min, streamAmount is 1-3L/min, and after the first serpentine condenser 202 samplings finish, valve V6 and valve V8 closeClose, valve V5 and valve V11 open simultaneously, switch to the second serpentine condenser 201, now streamThe reading of amount meter feeds back to digital control unit 300. The second serpentine condenser 201 and below pipelineWork identical with the first serpentine condenser 202, this serpentine condenser start sampling.
Switch to after the second serpentine condenser 201, valve V3 and valve V9 open, water pump 213Absorption liquid in the first NaOH solution tank NaOH 212 is pumped into the first serpentine condenser 202, and water pump 213 flows canArrange, be generally 1-2ml/s, water pump 213 opening times are 30s, add the first serpentine condenser 202In liquid can control, this flow feeds back to digital control unit, in order to calculate SO3Concentration.
After liquid pump opening time finishes, close, valve V1 opens, and the second air pump 214 is started working,Utilize pressure-air that all liq in the first serpentine condenser 202 is pressed into anti-in liquid-phase detection deviceAnswer device 206, the second air pump 214 opening times to be generally 30s, finish rear valve-off V1 and valveV9, liquid pump 210 is started working, and the liquid in the second NaOH solution tank NaOH 211 is pressed into reactor 206, liquidPump 210 flows can arrange, and are generally 1-2ml/s, and liquid pump 210 opening times are 30s, add reactionLiquid in device 206 can be controlled, and this flow feeds back to digital control unit in order to calculating SO3Concentration.
When liquid pump 210 is started working, magnetic stirring apparatus starts to stir, and mixing time is 40s,After stirring finishes, light source 205 sends the light wave that light wave is 500-600nm, absorbs through reactor 206After, the light seeing through is received and measured light intensity by photometer 209, and this luminous intensity is fed back toDigital control unit 300. Obtain after light intensity signal, reactor 206 bottom valve V12 open,Effluent discharge, valve V12 closes after opening 10s.
The central processing unit 304 of digital control unit 300 receives liquid pump 210, water pump 213, luminosityMeter 209, flow meter parameter, draw SO in flue gas by processing3Reading, and be shown to numeral demonstrationOn device.
One-shot measurement leaves it at that, and is measured as for the second 201 sampling times of serpentine condenser to finish next timeAfter, valve V5 and valve V11 close, and valve V6 and valve V8 open, and switch to the first snakeShape condenser pipe 202 is sampled, the measuring method of the second serpentine condenser 201 interior sulfuric acid droplets and the first snakeShape condenser pipe 202 is identical, and difference is that by-pass valve control is different, and corresponding valve is valve V2, valveDoor V4 and valve V10.
The operation principle of apparatus of the present invention is as follows:
Flue gas enters corresponding snake through flue gas sampling pipe 102 after removing dust wherein by filter chamber 101Shape condenser pipe. The temperature of serpentine condenser is 60-80 DEG C, lower than sulphuric acid dew point, therefore snakelike coldCondensation in solidifying pipe. The absorption liquid that sulfuric acid droplets in serpentine condenser and water pump 213 transport mixesAfter closing, enter reactor. Liquid enters after reactor, reacts with the reactant in the second NaOH solution tank NaOH,Generate precipitation or coloured ion, and this precipitation or coloured ion and sulfate ion concentration etc.With or proportional, be equal to the concentration of sulfur trioxide or proportional, measure this ion concentration,Can measure SO3Content. Coloured ion has the specific absorption peak of light wave (as chloranilic acid ion energyThe light wave that enough absorbing wavelength are 535nm), can measure ion concentration by optical method, thereby draw and adoptThe concentration of sulfur trioxide in sample flue gas.
Embodiment 1
Utilize apparatus of the present invention and measuring method to detect SO in the front flue gas of certain power plant's denitration3Concentration. Certain electricityThe denitration SCR of factory system measuring point is arranged as shown in Figure 5, SCR system entry measuring point, apparatus of the present inventionBe arranged on the horizontal flue of economizer 400 entrances (401 places, position), gaging hole is uniformly distributed. SurveyBefore examination, change silica wool in filter chamber 101, in the first NaOH solution tank NaOH 212, pack isopropyl alcohol concentration into and be80% the aqueous solution, packs thoron and BaCl in the second NaOH solution tank NaOH 2112Solution, optical source wavelengthFor 530nm, detect this position SO of power plant3Under this operating mode, mean concentration is 14.6mg/m3, with " combustionFlue-gas desulphurization plant performance test methods-GB/T21508-2008 " in method measure SO in flue gas3Concentration is 14.4mg/m3。
Embodiment 2
Utilize apparatus of the present invention and measuring method to detect after certain power plant's denitration SO in flue gas3Concentration. Certain electricityThe denitration SCR of factory system measuring point is arranged as shown in Figure 5, SCR system outlet measuring point, dress of the present inventionPut and be arranged on the horizontal flue that economizer 400 exports (402 places, position), gaging hole is uniformly distributed.Before test, change silica wool in filter chamber 101. In the first NaOH solution tank NaOH 212, packing isopropyl alcohol concentration into is80% the aqueous solution, packs thoron and BaCl in the second NaOH solution tank NaOH 2112Solution, optical source wavelengthFor 530nm, detect this position SO of power plant3Under this operating mode, mean concentration is 42.1mg/m3, with " combustionFlue-gas desulphurization plant performance test methods-GB/T21508-2008 " in method measure SO in flue gas3Concentration is 42.2mg/m3。
Claims (4)
1. an on-line measuring device for sulfur trioxide in flue gas, comprises flue gas sampling unit, its spyLevy and be, also comprise:
Gas-liquid separator, for by the SO of the flue gas from flue gas sampling unit3Be condensed into sulfuric acid liquidDrip with gas phase separation;
Vapor detection unit, for measuring the gas phase flow rate from described gas-liquid separator;
The first NaOH solution tank NaOH, for providing absorption liquid to mix described sulfuric acid liquid to described gas-liquid separatorDrip and form mixed liquor;
Liquid phase detecting unit, has transformed from the mixed liquor of described gas-liquid separator for measuringSO3Quality;
Digital control unit, for tying according to the detection of described vapor detection unit and liquid phase detecting unitFruit is calculated SO in flue gas3Concentration;
Described gas-liquid separator is two serpentine condensers parallel with one another, the entrance of this serpentine condenserBe connected with described flue gas sampling unit and the first NaOH solution tank NaOH by corresponding pipeline and valve, this is snakelikeThe outlet of condenser pipe is by corresponding pipeline and valve and vapor detection unit and liquid phase detecting unit phaseBe communicated with;
Described flue gas sampling unit comprises the gas sampling gun head, filter chamber and the flue gas sampling that are communicated with successivelyPipe, the tail end of described flue gas sampling pipe is connected with described gas-liquid separator, in described filter chamber, is provided withFilter;
Described liquid phase detecting unit comprises:
The reactor being communicated with the outlet of described serpentine condenser;
The second air pump being connected with the entrance of described serpentine condenser, for by described serpentine condenserMixed liquor be pressed into reactor;
For detect the light source of light to described reactor transmitting;
For receiving photometer, this photometer and the digital control list of the transmitted light that sees through described reactorUnit's communication connection;
Also be provided with the second NaOH solution tank NaOH being connected with described reactor by liquid pump, described reactor withMagnetic stirring apparatus;
Described flue gas sampling pipe peripheral hardware is useful on the heater that keeps temperature in flue gas sampling pipe, described inIt is outer that heater is provided with insulation outward;
Described flue gas sampling pipe is also provided with temperature collecting device outward, and this temperature collecting device communicates to connect extremelyDescribed digital control unit.
2. the on-line measuring device of sulfur trioxide in flue gas according to claim 1, its feature existsIn, between described vapor detection unit and the outlet of corresponding serpentine condenser, be provided with air pump, for by instituteState in the gas suction vapor detection unit in serpentine condenser.
One kind utilize on-line measuring device described in claim 1 carry out sulfur trioxide in flue gasLine monitoring method, is characterized in that, comprising:
(1) by flue gas sampling unit continuous acquisition flue gas to be measured, flue gas is heated up;
(2) flue gas to be measured is warming up to after 300～400 DEG C, and it is snakelike that air pump provides negative pressure that flue gas is enteredIn condenser pipe, the SO in serpentine condenser in flue gas3Be condensed into sulfuric acid droplets, remove SO3AfterFlue gas enters vapor detection unit record gas phase flow rate;
(3) condensation finishes to pass into absorption liquid in backward described serpentine condenser, with described sulfuric acid dropletsMix, form liquid phase mixed liquor, liquid phase mixed liquor enters in liquid phase detecting unit and reacts with barium salt solution,Detect the SO having transformed in liquid phase3Quality;
(4) receive the detection knot of vapor detection unit and liquid phase detecting unit by digital control unitReally, and calculate SO in flue gas3Concentration.
4. method according to claim 3, is characterized in that, the temperature of described serpentine condenserDegree is 60-80 DEG C.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310376879.5A CN103472061B (en) | 2013-08-27 | 2013-08-27 | The on-line measuring device of sulfur trioxide and method in a kind of flue gas |
| PCT/CN2013/084460 WO2015027546A1 (en) | 2013-08-27 | 2013-09-27 | Online detection device and method for sulfur trioxide contained in flue gas |
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| CN103472061A (en) | 2013-12-25 |
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