CN103472061A - Device and method for detecting sulfur trioxide in flue gas on line - Google Patents
Device and method for detecting sulfur trioxide in flue gas on line Download PDFInfo
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- CN103472061A CN103472061A CN2013103768795A CN201310376879A CN103472061A CN 103472061 A CN103472061 A CN 103472061A CN 2013103768795 A CN2013103768795 A CN 2013103768795A CN 201310376879 A CN201310376879 A CN 201310376879A CN 103472061 A CN103472061 A CN 103472061A
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- serpentine condenser
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- 239000003546 flue gas Substances 0.000 title claims abstract description 132
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 130
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005070 sampling Methods 0.000 claims abstract description 68
- 239000007788 liquid Substances 0.000 claims abstract description 58
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000007789 gas Substances 0.000 claims abstract description 39
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 239000007791 liquid phase Substances 0.000 claims abstract description 35
- 239000012071 phase Substances 0.000 claims abstract description 20
- 238000010521 absorption reaction Methods 0.000 claims abstract description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 150
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 74
- 239000000243 solution Substances 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 6
- 159000000009 barium salts Chemical class 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 238000003760 magnetic stirring Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 239000012266 salt solution Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000005191 phase separation Methods 0.000 claims description 2
- 238000010792 warming Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 10
- 239000000779 smoke Substances 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000002156 mixing Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 11
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 150000002500 ions Chemical class 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 210000002268 wool Anatomy 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000001117 sulphuric acid Substances 0.000 description 3
- 235000011149 sulphuric acid Nutrition 0.000 description 3
- XQVKLMRIZCRVPO-UHFFFAOYSA-N 4-[(2-arsonophenyl)diazenyl]-3-hydroxynaphthalene-2,7-disulfonic acid Chemical compound C12=CC=C(S(O)(=O)=O)C=C2C=C(S(O)(=O)=O)C(O)=C1N=NC1=CC=CC=C1[As](O)(O)=O XQVKLMRIZCRVPO-UHFFFAOYSA-N 0.000 description 2
- 241000679125 Thoron Species 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 1
- 229910001626 barium chloride Inorganic materials 0.000 description 1
- OOULUYZFLXDWDQ-UHFFFAOYSA-L barium perchlorate Chemical compound [Ba+2].[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O OOULUYZFLXDWDQ-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- IPPWILKGXFOXHO-UHFFFAOYSA-N chloranilic acid Chemical compound OC1=C(Cl)C(=O)C(O)=C(Cl)C1=O IPPWILKGXFOXHO-UHFFFAOYSA-N 0.000 description 1
- -1 chloranilic acid ion Chemical class 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000007792 gaseous phase Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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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
-
- 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—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0042—SO2 or SO3
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sampling And Sample Adjustment (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a device and a method for detecting sulfur trioxide (SO3) in flue gas on line. The device comprises a flue gas collecting unit, a gas liquid separator, a gas phase detection unit, a first solution tank, a liquid phase detection unit and a digital control unit, wherein the gas liquid separator is used for condensing SO3 in the flue gas from a flue gas sampling unit into sulfuric acid liquid drops and separating the sulfuric acid liquid dropsfrom gas phase; the gas phase detection unit is used for measuring the flow of the gas phase from the gas liquid separator; the first solution tank is used for providing an absorption liquid to the gas liquid separator and mixing the absorption liquid with the sulfuric acid liquid drops to form mixed liquid; the liquid phase detection unit is used for measuring the mass of the transformed SO3 in the mixed liquid from the gas liquid separator; and the digital control unit is used for calculating the SO3 concentration of the flue gas according to the detection results of the gas phase detection unit and the liquid phase detection unit. According to the device and the method, on-line measurement of the SO3 of the flue gas is realized, the SO3 of the flue gas is sampled and the SO3 content is analyzed, so that a coal-fired power plant can take corresponding measures conveniently, the SO3 content of the flue gas is controlled, the corrosion to a flue and equipment is reduced, and the heat loss due to exhaust smoke of a boiler is reduced to the maximum degree.
Description
Technical field
The present invention relates to the smoke gas treatment technical field, be specifically related to on-line measuring device and the method for sulfuric anhydride in a kind of flue gas.
Background technology
The current SO of thermal power plant
3although discharge capacity seldom, due to SO
3very easily the water vapor in flue gas is combined and is formed sulfuric acid vapor, on the heating surface at wall temperature lower than acid dew point, condenses, and causes acid dew piont corrosion.SO in flue gas
3, the more, acid dew-point temperature is higher for content, and the corrosion scope is more serious.In recent years the increasing Installation in Plant of China wet process of FGD, because the humidity of clean flue gas after wet desulphurization is larger, remaining SO in flue gas
3very easily rapid conversion is the sulfuric acid droplet, and flue and upstream device are caused to heavy corrosion.SO in waste gas
3when concentration is low to moderate 5-10ppm, due to hot flue gases in atmosphere than cooling white, purple or the black feathering of producing in cold air.
Selective catalytic reduction reaction (selective catalytic reactor, SCR) is in order to control NO in power plant
xthe measure of discharging and adopting, adding NH
3situation under, SCR is by NO
xbe reduced to N
2, but also can cause a small amount of SO
2be converted into SO
3although, SO
3now concentration is not high, but when discharge can produce the secondary feathering of highly-visible.
For solving targetedly the acid dew piont corrosion problem, SO in flue gas need to understand in power plant
3concentration, not yet find that at present flue gas analyzer has mensuration SO
3this function of content, this is mainly due to SO
3can condense or stick on transmission pipeline with the form of sulfuric acid vapor or sulfuric acid mist in being transferred to the apparatus measures terminal procedures, cause sampling error and to the strong corrosion of instrument.
Proposed the measurement to solid particulate matter in flue gas in " in Concentration in Fixed Pollutants Source, particle is measured and the gaseous contaminant method of sampling ", and do not considered SO
3measurement Deng the liquid particles thing.In fact, SO
3in flue gas, concentration of emission can reach 10mg/m
3above, SO after the SCR denitration
3concentration can reach 30～80mg/m
3, become the subject matter of current coal-burning power plant fine particles pollution.
Developed in the art multiple for measuring flue gas SO
3the technology of concentration.The novel practical patent that the patent No. is 200620163937.1 discloses SO in a kind of flue gas
3sampling apparatus, comprise dedusting mechanism, sampling pipe, spiral collection tube and aspirating mechanism, wherein dedusting mechanism is arranged on the inlet end of sampling pipe, the endpiece of this sampling pipe is connected with the import of spiral collection tube by pipeline, the import and export of spiral collection tube all is positioned at spiral upper end, and its outlet communicates with described aspirating mechanism by silica gel hose.Without measure portion, and can't realize on-line measurement in patent.
The patent of invention that the patent No. is 20091021169.1 disclose a kind of for detection of, measure and control SO in flue gas
3with the method and apparatus of other condensables, can measure the concentration of multiple condensables, but the method is high for the material accuracy requirement, can't realize the measurement of on-line continuous.In the U.S., a kind of SO is disclosed in the patent No. 2011/0097809
3measuring method, precision is higher, but this device carries inconvenience, is applicable to laboratory operation.
Summary of the invention
The invention provides on-line measuring device and the method for sulfuric anhydride in a kind of flue gas, to analyze SO in flue gas
3content, realized SO in flue gas
3on-line measurement, have simple in structure, the characteristics such as be easy to carry.
The on-line measuring device of sulfuric anhydride in a kind of flue gas, comprise the flue gas sampling unit, also comprises:
Gas-liquid separator, for will be from the SO of the flue gas of flue gas sampling unit
3be condensed into sulfuric acid droplets with gas phase separation;
The vapor detection unit, the gas phase flow rate for metering from described gas-liquid separator;
The first NaOH solution tank NaOH, form mixed liquor for absorption liquid is provided to described gas-liquid separator to mix described sulfuric acid droplets;
The liquid phase detecting unit, the SO transformed from the mixed liquor of described gas-liquid separator for metering
3quality;
Digital control unit, calculate flue gas SO for the testing result according to described vapor detection unit and liquid phase detecting unit
3concentration.
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 entrance of this serpentine condenser is connected with described flue gas sampling unit and the first NaOH solution tank NaOH by corresponding pipeline and valve, and the outlet of this serpentine condenser is connected with vapor detection unit and liquid phase detecting unit by corresponding pipeline and valve.
For convenience of the separation of gas phase, further preferably, be provided with air pump between the outlet of described vapor detection unit and corresponding serpentine condenser, in the gas suction vapor detection unit by described serpentine condenser.The negative pressure produced by this air pump is separated the gas in corresponding serpentine condenser and is passed through the metering of vapor detection unit.
Serpentine condenser, the first NaOH solution tank NaOH, vapor detection unit, corresponding valve and liquid phase detecting unit form SO
3detecting unit, flue gas sampling unit continuous acquisition flue gas to be measured, then enter serpentine condenser, due to temperature in condenser pipe, lower than sulphuric acid dew point, forms sulfuric acid droplets in coiled pipe, thereby by SO
3with flue gas, separated, sampling finishes to add absorption liquid in backward coiled pipe, forms sulfuric acid droplets (SO
4 2-), the solution in coiled pipe is sent into the liquid phase detecting unit and is detected, and at first adds barium salt solution, forms precipitation after stirring, by optical system detection SO
4 2-concentration, SO
3detecting unit sends to digital control unit by the detection information of gas-liquid two-phase, by digital control unit, receives and calculate SO in flue gas to be measured
3content.
Further preferably, also be provided with one for the constant temperature enclosure of described serpentine condenser is installed.Controlling this constant temperature enclosure temperature is 60-80 ℃.
Further preferably, the diameter of described serpentine condenser is 8-15cm.
At SO
3in detecting unit, in constant temperature enclosure, serpentine condenser will carry out condensation from the flue gas of flue gas sampling unit, isolate the SO in flue gas
3, its flue gas flow is by the vapor detection unit inspection.
Described gas-liquid separator can be several serpentine condensers parallel with one another, alternation mutually between serpentine condenser, and as a preferred technical solution of the present invention, described gas-liquid separator is two serpentine condensers parallel with one another.
Be provided with in device and two corresponding by-pass valve controls of serpentine condenser, replaced after finishing a serpentine condenser sampling.One of them serpentine condenser collection adds absorption liquid, the SO in flue gas to be measured after finishing in this coiled pipe
3the final SO that forms
4 2-be present in the liquid phase mixed liquor, by the liquid phase detecting unit, detect SO
4 2-amount.
The vapor detection unit comprises flowmeter, thermometer and barometer, records the temperature and pressure information of gas phase simultaneously.
The liquid phase detecting unit is for detection of SO in flue gas
3content, a kind of preferred technical scheme, described liquid phase detecting unit comprises:
The reactor be communicated with the outlet of described serpentine condenser;
The second air pump be connected with the entrance of described serpentine condenser, be pressed into reactor for the mixed liquor by described serpentine condenser;
For detect the light source of light to described reactor emission;
For receiving the photometer of the transmitted light that sees through described reactor, this photometer and digital control unit communication connection.
Further preferably, also be provided with the second NaOH solution tank NaOH be connected with described reactor by liquid pump, described reactor is with magnetic stirring apparatus.
In NaOH solution tank NaOH, splendid attire is by energy and SO
4 2-react and generate the material of coloured ion or precipitation, for example, it can be barium salt, from the liquid phase in gas-liquid separator and the substance reaction in reactor, then launch detection light in reactor, after seeing through the liquid in reactor, by photometer, received, photometer sends to digital control unit by the information of reception, by digital control unit, calculates SO
3amount.
Preferably, the barium salt in described liquid phase detecting unit NaOH solution tank NaOH is barium chloride, chloranilic acid barium or barium perchlorate.
The flue gas sampling unit contains SO in order to continuous acquisition
3flue gas, send into SO
3in detecting unit, with regard to sampling unit itself, it can be existing sampling mechanism, in the present invention, as a kind of preferred technical scheme, described flue gas sampling unit comprises gas sampling gun head, filter chamber and the flue gas sampling pipe be communicated with successively, and the tail end of described flue gas sampling pipe is connected with described gas-liquid separator, in described filter chamber, is provided with filtration unit.
In order to guarantee the temperature of flue gas to be measured, make the SO in flue gas
3all with gaseous state, exist, preferably, described flue gas sampling pipe peripheral hardware is useful on the heating arrangement that keeps temperature in the flue gas sampling pipe, and it is outer that described heating arrangement is provided with insulation outward.
Described heating arrangement is preferably the electric heater unit of winding outside the flue gas sampling pipe, in order to heat the flue gas to be measured in the flue gas sampling pipe.
The 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 heat the steel pipe temperature, makes the flue-gas temperature in steel pipe remain on 300～400 ℃, the insulation skin of being made by insulation material around the home outside electric heater unit.
For collection and the control that facilitates flue-gas temperature, as preferably, described flue gas sampling pipe also is provided with temperature collecting device outward, and this temperature collecting device communication connection is to described digital control unit.
Preferably, described digital control unit comprises shell and the central processing unit that is positioned at shell, and described shell is provided with control knob and display screen.
Shell, for placing control knob and display screen, control knob is for controlling whole sampling process correlation parameter, and display screen is 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, calculates SO in flue gas simultaneously automatically
3concentration.This central processing unit preferably can adopt the PLC controller.
The present invention also provides the on-line monitoring method of sulfuric anhydride 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), after flue gas to be measured is warming up to 300～400 ℃, air pump provides negative pressure that flue gas is entered in serpentine condenser, the SO in serpentine condenser in flue gas
3be condensed into sulfuric acid droplets, remove SO
3after flue gas enter 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 droplets, mixes, and forms the liquid phase mixed liquor, and the liquid phase mixed liquor enters in the liquid phase detecting unit and reacts with barium salt solution, detects the SO transformed in liquid phase
3quality;
(4) receive the testing result of vapor detection unit and liquid phase detecting unit by digital control unit, and calculate SO in flue gas
3concentration.
As preferably, the temperature of described serpentine condenser is 60-80 ℃.This temperature is lower than sulphuric acid dew point, the SO in flue gas
3be 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 gas
3on-line measurement, there are simple in structure, the characteristics such as be easy to carry, it can be to the SO in flue gas
3sampled, and analyzed SO
3content, be convenient to coal-burning power plant and take corresponding measure, control SO in flue gas
3content, reduce the corrosion to flue and equipment thereof, reduces to greatest extent the boiler exhaust gas thermal loss, has Measuring Time short, the advantage of full process automatization simultaneously.
The accompanying drawing explanation
Fig. 1 is one-piece construction 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 invention
3the 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 pick-up unit of the present invention in smoke processing system.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
As shown in Figure 1, in figure, 100 is the smoke collecting unit, and 200 is SO
3detecting unit, 300 is digital control unit, system consists of these three parts.
As shown in Figure 2, smoke collecting unit 100 comprises gas sampling gun head 105, filter chamber 101 and the sampling gun be communicated with successively.
Sampling gun is interior outer double-layer structure, internal layer is flue gas sampling pipe 102, for the steel pipe of being made by rush-resisting material, at the outer heating arrangement 103 that arranges of flue gas sampling pipe 102, in present embodiment, this heating arrangement is the electric heater unit outside flue gas sampling pipe 102 around the home, insulation is set outside being positioned at heating arrangement outer 104, and insulation outer 104 is made by insulation material.Heating arrangement 103 and outer 104 actings in conjunction of insulation, make the flue-gas temperature in flue gas sampling pipe 102 remain on 300～400 ℃.Flue gas sampling pipe 102 afterbodys and SO
3detecting unit is communicated with.
Flue gas sampling pipe 102 for being threaded, detachably, is filled with silica wool with filter chamber 101 in filter chamber, 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, can be for example temperature sensor, 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 SO
3detecting unit 200 connects, the SO of present embodiment
3gas-liquid separator in detecting unit 200 is two serpentine condensers parallel with one another (the first serpentine condenser 202 and the second serpentine condensers 201), two serpentine condensers are arranged in constant temperature enclosure 215, the entrance of two serpentine condensers is connected with the first NaOH solution tank NaOH 212 with the afterbody outlet of flue gas sampling pipe 102 by three-way pipeline and corresponding valve, the outlet of two serpentine condensers connects gas phase pipeline and liquid phase pipeline by three-way pipeline with corresponding valve, when adopting serpentine condenser to be gas-liquid separator, the outlet of serpentine condenser not only is gaseous phase outlet but also be liquid-phase outlet, by corresponding valve, control.
For the first serpentine condenser 202, control being connected between entrance and flue gas sampling pipe 102 and the first NaOH solution tank NaOH 212 by valve V6 and valve V3, control and export and being connected of gas phase pipeline and liquid phase pipeline by valve V8 and valve V9; For the second serpentine condenser 201, control being connected between entrance and flue gas sampling pipe 102 and the first NaOH solution tank NaOH 212 by valve V5 and valve V4, control and export and being connected of gas phase pipeline and liquid phase pipeline by valve V11 and valve V10.
Between gas phase pipeline and flue gas sampling pipe 102, a pipeline also in parallel, arrange valve V7 on this pipeline, for before sampling to the detection of being bled of gas phase pipeline.
In order to facilitate the eliminating of liquid phase in serpentine condenser, second air pump 214 also is set, this second air pump 214 is connected to respectively the entrance of two serpentine condensers by three-way pipeline and valve, wherein by valve V1, control being connected between the second air pump 214 and the first serpentine condenser 202 entrances, valve V2 controls being connected between the second air pump 214 and the second serpentine condenser 201.
Along setting gradually the first air pump 203, operation valve V13 and gas phase detecting unit 204 on the gas phase pipeline, vapor detection unit 204 comprises flowmeter, thermometer and barometer; Along liquid phase pipeline outlet coupled reaction device 206, reactor 206 also has an entrance to connect successively liquid pump 210, the second NaOH solution tank NaOH 211, reactor 206 bottoms are magnetic stirring apparatus 207, stirrer 208 is arranged in reactor 206, a side at reactor 206 arranges light source 205, opposite side at reactor arranges photometer 209, and the light that sees through reactor 206 is absorbed by this photometer 209 and is sent to digital control unit 300.Reactor 206 bottoms arrange discharge pipe, and valve V12 is set on this discharge pipe.
SO
3detecting unit 200 also comprises first NaOH solution tank NaOH 212, the first NaOH solution tank NaOH 212 is connected with the entrance to a serpentine condenser by three-way pipeline and valve, on the pipeline between the first NaOH solution tank NaOH 212 and corresponding serpentine condenser, water pump 213 is set, water pump 213 pumps into the absorption liquid in the first NaOH solution tank NaOH 212 in corresponding serpentine condenser; Be provided with the second air pump 214 and corresponding operation valve thereof on the pipeline of corresponding serpentine condenser and the first NaOH solution tank NaOH 212.
All to be connected by pipeline between upper-part.
As shown in Figure 4, digital control unit 300 is comprised of shell and central processing unit 304, and shell comprises display screen 302, control knob 303, outer container 301.Wherein display screen 302 goes out SO for display measurement
3result, control knob 303 is for beginning and end and some parameters of control survey; Central processing unit 304, for controlling the switch of liquid pump, two air pumps and a series of valves, is accepted the parameter of harvester, central processing unit 304 and each device (temperature collecting device; Flowmeter in the vapor detection unit, thermometer and barometer; Photometer; And each road valve) with line traffic, connect.SO in central processing unit 304 receiver gases flows and liquid
4 2-signal, draw SO in flue gas by processing
3reading, and be shown on digital indicator.
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, the heating arrangement of sampling gun starts heating, after temperature is heated to 300～400 ℃, valve-off V7, open valve V6 and valve V8, keeping the flue-gas temperature to be measured in sampling gun in gatherer process is 300～400 ℃, and flue gas to be measured enters flue gas sampling pipe 102 after filter chamber 101 filters.
Flue gas enters the first serpentine condenser 202 in constant temperature enclosure (the constant temperature enclosure temperature is 60～80 ℃), the SO in flue gas from the flue gas sampling pipe out
3condensation becomes sulfuric acid droplets.The first air pump 203 after the first serpentine condenser 202 is for providing negative pressure, gas is extracted out from the first serpentine condenser 202, operation valve V13 is for controlling gas flow, flowmeter in vapor detection unit 204 is for measuring gas flow, flowmeter feeds back to digital control unit 300 by the flow information of its metering, in order to calculating SO in flue gas
3content.
The sampling time of a general coiled pipe is 5min, sampling time must be more than 3min, flow is 1-3L/min, after the first serpentine condenser 202 samplings finish, valve V6 and valve V8 close, valve V5 and valve V11 open simultaneously, switch to the second serpentine condenser 201, and now the reading of flowmeter feeds back to digital control unit 300.The work of the second serpentine condenser 201 and back pipeline thereof is identical with the first serpentine condenser 202, and this serpentine condenser starts sampling.
After switching to the second serpentine condenser 201, valve V3 and valve V9 open, water pump 213 pumps into the first serpentine condenser 202 by the absorption liquid in the first NaOH solution tank NaOH 212, water pump 213 flows can arrange, be generally 1-2ml/s, water pump 213 opening times are 30s, add the liquid in the first serpentine condenser 202 to control, this flow feeds back to digital control unit, in order to calculating SO
3concentration.
The liquid pump opening time is closed after finishing, valve V1 opens, the second air pump 214 is started working, utilize pressure-air that all liq in the first serpentine condenser 202 is pressed into to the reactor 206 in liquid-phase detection device, the second air pump 214 opening times are generally 30s, valve-off V1 and valve V9 after finishing, liquid pump 210 is started working, liquid in the second NaOH solution tank NaOH 211 is pressed into to reactor 206, liquid pump 210 flows can arrange, be generally 1-2ml/s, liquid pump 210 opening times are 30s, add the liquid in reactor 206 to control, this flow feeds back to digital control unit in order to calculating SO
3concentration.
When liquid pump 210 is started working, magnetic stirring apparatus starts to stir, mixing time is 40s, after stirring end, light source 205 sends the light wave that light wave is 500-600nm, after reactor 206 absorbs, the light seen through is received and measured light intensity by photometer 209, and this light intensity is fed back to digital control unit 300.After obtaining light intensity signal, reactor 206 bottom valve V12 open, effluent discharge, and valve V12 closes after opening 10s.
The central processing unit 304 of digital control unit 300 receives liquid pump 210, water pump 213, photometer 209, flow meter parameter, by processing, draws SO in flue gas
3reading, and be shown on digital indicator.
One-shot measurement leaves it at that, after being measured as the second serpentine condenser 201 sampling times end next time, valve V5 and valve V11 close, valve V6 and valve V8 open, switch to the first serpentine condenser 202 samplings, the measuring method of the second serpentine condenser 201 interior sulfuric acid droplets is identical with the first serpentine condenser 202, and difference is that by-pass valve control is different, and corresponding valve is valve V2, valve V4 and valve V10.
The principle of work of apparatus of the present invention is as follows:
Flue gas enters corresponding serpentine condenser through flue gas sampling pipe 102 after removing dust wherein by filter chamber 101.The temperature of serpentine condenser is 60-80 ℃, lower than sulphuric acid dew point, and therefore condensation in serpentine condenser.After being mixed, the absorption liquid that sulfuric acid droplets in serpentine condenser transports with water pump 213 enters reactor.After liquid enters reactor, with the reactant in the second NaOH solution tank NaOH, react, generate precipitation or coloured ion, and this precipitation or coloured ion and sulfate ion concentration are equal to or are proportional, with the concentration of sulfuric anhydride, be equal to or proportional, measure this ion concentration, can measure SO
3content.Coloured ion have light wave the specific absorption peak (as the chloranilic acid ion can absorbing wavelength the light wave that is 535nm), can measure ion concentration by optical method, thereby draw the concentration of sulfuric anhydride in the sampling 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 denitration
3concentration.Certain the denitration SCR of power plant system measuring point is arranged as shown in Figure 5, SCR system entry measuring point, and apparatus of the present invention are arranged on the horizontal flue of economizer 400 entrances (401 places, position), and gaging hole is uniformly distributed.Change silica wool in filter chamber 101 before test, the aqueous solution that the isopropyl alcohol concentration of packing in the first NaOH solution tank NaOH 212 is 80%, thoron and BaCl pack in the second NaOH solution tank NaOH 211
2solution, optical source wavelength is 530nm, detects this position SO of power plant
3under this operating mode, mean concentration is 14.6mg/m
3, by method in " coal-fired flue gas desulfurization equipment performance method of testing-GB/T21508-2008 ", measure SO in flue gas
3concentration is 14.4mg/m
3.
Embodiment 2
Utilize apparatus of the present invention and measuring method to detect after certain power plant's denitration SO in flue gas
3concentration.Certain the denitration SCR of power plant system measuring point is arranged as shown in Figure 5, SCR system outlet measuring point, and Plant arrangement of the present invention is on the horizontal flue of economizer 400 outlets (402 places, position), and gaging hole is uniformly distributed.Change silica wool in filter chamber 101 before test.The aqueous solution that the isopropyl alcohol concentration of packing in the first NaOH solution tank NaOH 212 is 80%, thoron and BaCl pack in the second NaOH solution tank NaOH 211
2solution, optical source wavelength is 530nm, detects this position SO of power plant
3under this operating mode, mean concentration is 42.1mg/m
3, by method in " coal-fired flue gas desulfurization equipment performance method of testing-GB/T21508-2008 ", measure SO in flue gas
3concentration is 42.2mg/m
3.
Claims (10)
1. the on-line measuring device of sulfuric anhydride in a flue gas, comprise the flue gas sampling unit, it is characterized in that, also comprises:
Gas-liquid separator, for will be from the SO of the flue gas of flue gas sampling unit
3be condensed into sulfuric acid droplets with gas phase separation;
The vapor detection unit, the gas phase flow rate for metering from described gas-liquid separator;
The first NaOH solution tank NaOH, form mixed liquor for absorption liquid is provided to described gas-liquid separator to mix described sulfuric acid droplets;
The liquid phase detecting unit, the SO transformed from the mixed liquor of described gas-liquid separator for metering
3quality;
Digital control unit, calculate flue gas SO for the testing result according to described vapor detection unit and liquid phase detecting unit
3concentration.
2. the on-line measuring device of sulfuric anhydride in flue gas according to claim 1, it is characterized in that, described gas-liquid separator is several serpentine condensers parallel with one another, the entrance of this serpentine condenser is connected with described flue gas sampling unit and the first NaOH solution tank NaOH by corresponding pipeline and valve, and the outlet of this serpentine condenser is connected with vapor detection unit and liquid phase detecting unit by corresponding pipeline and valve.
3. the on-line measuring device of sulfuric anhydride in flue gas according to claim 2, is characterized in that, is provided with air pump between the outlet of described vapor detection unit and corresponding serpentine condenser, in the gas suction vapor detection unit by described serpentine condenser.
4. the on-line measuring device of sulfuric anhydride in flue gas according to claim 3, is characterized in that, described liquid phase detecting unit comprises:
The reactor be communicated with the outlet of described serpentine condenser;
The second air pump be connected with the entrance of described serpentine condenser, be pressed into reactor for the mixed liquor by described serpentine condenser;
For detect the light source of light to described reactor emission;
For receiving the photometer of the transmitted light that sees through described reactor, this photometer and digital control unit communication connection.
5. the on-line measuring device of sulfuric anhydride in flue gas according to claim 4, is characterized in that, also be provided with the second NaOH solution tank NaOH be connected with described reactor by liquid pump, described reactor is with magnetic stirring apparatus.
6. according to the on-line measuring device of sulfuric anhydride in the described flue gas of the arbitrary claim of claim 1～5, it is characterized in that, described flue gas sampling unit comprises gas sampling gun head, filter chamber and the flue gas sampling pipe be communicated with successively, the tail end of described flue gas sampling pipe is connected with described gas-liquid separator, in described filter chamber, is provided with filtration unit.
7. the on-line measuring device of sulfuric anhydride in flue gas according to claim 6, is characterized in that, described flue gas sampling pipe peripheral hardware is useful on the heating arrangement that keeps temperature in the flue gas sampling pipe, and it is outer that described heating arrangement is provided with insulation outward.
8. the on-line measuring device of sulfuric anhydride in flue gas according to claim 6, is characterized in that, described flue gas sampling pipe also is provided with temperature collecting device outward, and this temperature collecting device communication connection is to described digital control unit.
9. the on-line monitoring method of sulfuric anhydride in a flue gas, is characterized in that, comprising:
(1) by flue gas sampling unit continuous acquisition flue gas to be measured, flue gas is heated up;
(2), after flue gas to be measured is warming up to 300～400 ℃, air pump provides negative pressure that flue gas is entered in serpentine condenser, the SO in serpentine condenser in flue gas
3be condensed into sulfuric acid droplets, remove SO
3after flue gas enter 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 droplets, mixes, and forms the liquid phase mixed liquor, and the liquid phase mixed liquor enters in the liquid phase detecting unit and reacts with barium salt solution, detects the SO transformed in liquid phase
3quality;
(4) receive the testing result of vapor detection unit and liquid phase detecting unit by digital control unit, and calculate SO in flue gas
3concentration.
10. method according to claim 9, is characterized in that, the temperature of described serpentine condenser is 60-80 ℃.
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| 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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| 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 |
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| CN111122564B (en) * | 2019-12-31 | 2020-10-02 | 深圳市华域环保科技有限公司 | A dregs detection device for preparing sintering class regeneration product |
| CN111122564A (en) * | 2019-12-31 | 2020-05-08 | 深圳市华域环保科技有限公司 | A dregs detection device for preparing sintering class regeneration product |
| CN111624060A (en) * | 2020-06-23 | 2020-09-04 | 西安热工研究院有限公司 | Flue gas sulfur trioxide sampling equipment and method |
| CN113804515A (en) * | 2021-09-13 | 2021-12-17 | 浙江天地环保科技股份有限公司 | Chimney exhaust port SO of coal-fired power plant3Continuous sampling device and method |
| WO2024192870A1 (en) * | 2023-03-22 | 2024-09-26 | 华电电力科学研究院有限公司 | Online monitoring device and monitoring method for sulfur trioxide in flue gas |
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| CN103472061B (en) | 2016-05-04 |
| WO2015027546A1 (en) | 2015-03-05 |
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