CN106153827A - Online sulfur trioxide apparatus for measuring concentration based on liquid absorption method and method - Google Patents
Online sulfur trioxide apparatus for measuring concentration based on liquid absorption method and method Download PDFInfo
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- CN106153827A CN106153827A CN201610631261.2A CN201610631261A CN106153827A CN 106153827 A CN106153827 A CN 106153827A CN 201610631261 A CN201610631261 A CN 201610631261A CN 106153827 A CN106153827 A CN 106153827A
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- absorbing liquid
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- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 title claims abstract description 144
- 239000007788 liquid Substances 0.000 title claims abstract description 143
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000005070 sampling Methods 0.000 claims abstract description 43
- 238000012546 transfer Methods 0.000 claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 238000003860 storage Methods 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 39
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 27
- 239000003546 flue gas Substances 0.000 claims description 27
- 238000012360 testing method Methods 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 2
- 108010063955 thrombin receptor peptide (42-47) Proteins 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 235000010269 sulphur dioxide Nutrition 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- WWILHZQYNPQALT-UHFFFAOYSA-N 2-methyl-2-morpholin-4-ylpropanal Chemical compound O=CC(C)(C)N1CCOCC1 WWILHZQYNPQALT-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 239000004291 sulphur dioxide Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
Classifications
-
- 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
- G01N33/0044—Sulphides, e.g. H2S
-
- 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
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display
- G01N33/0067—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display by measuring the rate of variation of the concentration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/00584—Control arrangements for automatic analysers
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The present invention relates to a kind of online sulfur trioxide apparatus for measuring concentration based on liquid absorption method and method.Airway one end of this device is connected with sampling tube by airway electromagnetic valve, and the other end is connected with snakelike absorption tube；Absorbing liquid tube at one end is positioned at absorbing liquid storage, and the other end is connected with airway electromagnetic valve, and absorbing liquid conduit is additionally provided with absorbing liquid transfer pump；Liquid trap connects snakelike absorption tube and sample liquid conveying pipe respectively, and sample liquid conveying pipe is also connected with analyser；Exhaust tube one end is connected with liquid trap by exhaust tube electromagnetic valve, and the other end is connected with electronic flowmeter；Single-chip microcomputer linking parsing instrument, electronic flowmeter, absorbing liquid transfer pump, airway electromagnetic valve and exhaust tube electromagnetic valve respectively connect.Automaticity of the present invention is high, certainty of measurement is high.
Description
Technical field
The present invention relates to environmental protection test field, a kind of online sulfur trioxide measurement of concetration based on liquid absorption method
Device and method.
Background technology
Current coal accounts for China's primary energy proportion and is about 70%, and wherein about half directly burns for heat supply and generating,
Creating substantial amounts of pollutant in this process, the pollutant enjoying society and industry to pay close attention at present have sulfur dioxide, nitrogen oxygen
Compound, dust etc., sulfur trioxide is brought in recent years direct, indirect hazard are gradually paid attention to by insider.Abroad put into effect
Relevant sulfur trioxide discharge standard.
The constructive ways of coal-burning power plant's sulfur trioxide mainly has combustion process oxidation to generate and SCR denitration device catalyst will
Sulphur Dioxide becomes sulfur trioxide.Flue-gas temperature is deposited less than the form with gaseous sulfuric acid of sulfur trioxide in flue gas after 350 DEG C
?.
In flue gas, the main harm of sulfur trioxide has: 1, forms " Lan Yu " phenomenon, increase smoke evacuation opacity.2, sulfur is generated
Acid hydrogen ammonium blocks catalyst pores, causes catalysqt deactivation, and catalyst uses cycle time to increase production cost, running on the lower load
SCR denitration device entrance flue gas temperature is less than the minimum continuous running temperature requirement of catalyst, causes SCR denitration device out of service
Produced huge environmental protection pressure.3, generate ammonium hydrogen sulfate corrosion and block air preheater, causing exhaust gas temperature rising, boiler
The thermal efficiency reduces, air-introduced machine exert oneself increases, operating cost rising, even affect unit high load capacity stable operation.4, shape in flue gas
Become H2SO4Steam causes cold end corrosion, causes air and gas system air-tightness to reduce.Sulfur trioxide discharge and control the most gradually obtain weight
Depending on, it is therefore desirable to a kind of sulfur trioxide accurate, efficient test device.
The measuring method of domestic and foreign current mainly has: control condensation method and liquid absorption method.Controlling its principle of condensation method is
The sulphuric acid of droplet shape is attached to by centrifugal force that sample gas produces in flowing through constant temperature coil or serpentine pipe under the influence of centrifugal force
The wall of serpentine pipe, dissolves, by absorbing liquid, the sample liquid measure dissolved in sample liquid in condensing tube, and then analysis absorbing liquid and obtains flue gas
Middle sulfur trioxide concentration.Its principle of liquid absorption method is that sample gas passes through directly to absorb with absorbent three oxygen in flue gas in ice bath
Changing sulfur, absorbent can effectively prevent sulfur dioxide oxidized, and the sample gas after absorption enters it by after hydrogen peroxide Drexel bottle
His equipment.
Liquid absorption method is widely applied, but exposes some shortcomings in application process, affects its test essence
Degree, liquid absorption method shortcoming is summarized as follows.
(1) manual operation is loaded down with trivial details, high to personnel and instrument requirements.
(2) off-line measurement cannot obtain concentration value in real time.
Summary of the invention
It is dense that one of the technical problem to be solved is to provide a kind of online sulfur trioxide based on liquid absorption method
Degree measurement apparatus.
It is as follows that the present invention solves the technical scheme that above-mentioned technical problem used:
Online sulfur trioxide apparatus for measuring concentration based on liquid absorption method, including sampling tube, airway, airway electromagnetism
Valve, absorbing liquid storage, absorbing liquid transfer pump, absorbing liquid conduit, snakelike absorption tube, liquid trap, sample liquid conveying pipe, analyser,
Exhaust tube electromagnetic valve, exhaust tube, electronic flowmeter and single-chip microcomputer；Airway one end is by airway electromagnetic valve with sampling tube even
Connecing, the other end is connected with snakelike absorption tube；Absorbing liquid tube at one end is positioned at absorbing liquid storage, the other end and airway electromagnetism
Valve connects, and absorbing liquid conduit is additionally provided with absorbing liquid transfer pump；Liquid trap connects snakelike absorption tube and sample liquid conveying pipe, sample respectively
Liquid conveying pipe is also connected with analyser；Exhaust tube one end is connected with liquid trap by exhaust tube electromagnetic valve, the other end and electronic flow
Meter connects；Single-chip microcomputer linking parsing instrument, electronic flowmeter, absorbing liquid transfer pump, airway electromagnetic valve and exhaust tube electromagnetism respectively
Valve connects.
This device by arrange Single-chip Controlling analyser, electronic flowmeter, absorbing liquid transfer pump, airway electromagnetic valve and
Exhaust tube electromagnetic valve, so that the absorption of sulfur trioxide gas and measurement of concetration process realize automatization, it is to avoid artificial behaviour
That makees is loaded down with trivial details, improves the precision of measurement.
As preferably, sampling tube is heat tracing sampling tube, and sampling tube is provided with ceramic filtering device.Have an advantage in that, energy
Enough high temperature resistant, and the sample gas of cleaning can be provided for measurement apparatus.
As preferably, snakelike absorption tube is vertically arranged.Have an advantage in that, it is simple to the enrichment of condensed sample liquid, and favorably
In absorbing liquid flushing process, absorbing liquid from up to down flows.
It is dense that the two of the technical problem to be solved are to provide a kind of online sulfur trioxide based on liquid absorption method
Degree measuring method.
It is as follows that the present invention solves the technical scheme that above-mentioned technical problem used:
Online sulfur trioxide concentration measuring method based on liquid absorption method, comprises the steps:
S1. instrument POST；
S2. in absorbing liquid storage, add the absorbing liquid of enough sulfur trioxide, start absorbing liquid transfer pump, use absorbing liquid
Rinsing instrument, and absorbing liquid is carried out sulfur trioxide content mensuration, the test zero point as sulfur trioxide content feeds back to monolithic
Machine；
S3. start electronic flowmeter and absorbing liquid transfer pump, after making sample gas contact with absorbing liquid, enter Serpentis through airway
Shape absorption tube, and condense in snakelike absorption tube, sample liquid enters in liquid trap, and sample gas enters electron stream by exhaust tube electromagnetic valve
In gauge, electronic flowmeter by sample gas flow Real-time Feedback to single-chip microcomputer；
S4. sample liquid is entered in analyser, calculate the sulfur trioxide content in sample liquid, and result of calculation is fed back to monolithic
Machine；
S5. after test terminates, close airway electromagnetic valve and exhaust tube electromagnetic valve, open absorbing liquid transfer pump and pipeline is entered
Row rinses.
As preferably, in step S3, in sample gas, the calculation of sulfur trioxide content is:
Wherein, C is sulfur trioxide concentration, unit mg/m in sampling flue gas3, M is sulfur trioxide content in sampling flue gas, by
Analyser analysis obtains, unit mg, and Q is sampling flue gas volume, electronic flowmeter measurement obtain, unit m3。
As preferably, in step S1, self-inspection project includes that electrically valve opening the most short-circuit, each closes the most normal, pump
Exert oneself and whether meet the requirements, electronic flowmeter and analyser are demarcated, and check device air-tightness and the work of each equipment
Fill the most normal.Have an advantage in that, it is to avoid be short-circuited in sampling process, the problem such as leakage, it is ensured that sampling process suitable
Profit is carried out, and improves the accuracy of sampling.
This method is capable of automatically sampling sulfur trioxide and measurement of concetration, it is to avoid manually-operated numerous
Trivial, reduce the requirement to personnel and instrument, reduce cost；Measurement to sulfur trioxide concentration the most online.
The present invention compared with the existing technology has the following advantages and effect:
1, sampling tube, airway and absorbing liquid conduit are connected due to the present invention by airway electromagnetic valve such that it is able to will
Isopropanol in absorbing liquid storage being injected tangentially in sample gas along sample gas flow direction, makes absorbing liquid be fully contacted with sample gas,
The sulfur trioxide made in flue gas can be absorbed rapidly, it is to avoid during the transfer of follow-up sample liquid and analysis, sulfur trioxide loss causes
Error, and then improve the degree of accuracy of sulfur trioxide measurement of concetration.
2, it is placed in outside flue due to assembly of the invention, it is simple to keep in repair, maintain；Meanwhile, the equipment that the present invention uses is domestic
Change degree is high, effectively reduces equipment and maintenance cost.
3, chip microcontroller is passed through to sampling and the automatization of measurement of concetration process due to the present invention, it is not necessary to Zhuan Rencao
Making, it is to avoid manually-operated loaded down with trivial details, certainty of measurement is high.
4, using smart electronics effusion meter due to the present invention, internally provided with vacuum pump provides sampling required subnormal ambient.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the present invention.
Label declaration:
1, sampling tube 2, airway electromagnetic valve
3, absorbing liquid storage 4, absorbing liquid transfer pump
5, snakelike absorption tube 6, liquid trap
7, analyser 8, exhaust tube electromagnetic valve
9, electronic flowmeter 10, single-chip microcomputer
11, absorbing liquid conduit 12, airway
13, the conveying of sample liquid pipe 14, exhaust tube
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, following example be explanation of the invention and
The invention is not limited in following example.
Embodiment 1:
As it is shown in figure 1, based on liquid absorption method the online sulfur trioxide apparatus for measuring concentration of the present embodiment includes inducing QI
Pipe electromagnetic valve 2, absorbing liquid storage 3, absorbing liquid transfer pump 4, snakelike absorption tube 5, liquid trap 6, analyser 7, exhaust tube electromagnetism
Valve 8, be provided with the electronic flowmeter 9 of vacuum pump, single-chip microcomputer 10, absorbing liquid conduit 11, airway 12, sample liquid conveying pipe 13, take out
Trachea 14 and for sampling gas and sample gas is directed in flue the sampling tube 1 flue in flue.
The rear end of airway electromagnetic valve 2 and sampling tube 1 connects.One end and the airway electromagnetic valve 2 of airway 12 connect, separately
One end and snakelike absorption tube 5 connect.
Bottom snakelike absorption tube 5, liquid trap 6 is set.One end of sample liquid conveying pipe 13 and the bottom of liquid trap 6 connect, another
End and analyser 7 connect.
Exhaust tube electromagnetic valve 8 and electronic flowmeter 9 are arranged on exhaust tube 14, and exhaust tube electromagnetic valve 8 is with liquid trap 6 even
Connect.
One end of absorbing liquid conduit 11 is positioned at absorbing liquid storage 3, the other end and airway electromagnetic valve 2 and connects, and absorbs
Liquid transfer pump 4 is arranged on absorbing liquid conduit 11.
Analyser 7, electronic flowmeter 9, airway electromagnetic valve 2, exhaust tube electromagnetic valve 8 and absorbing liquid transfer pump 4 are all with single
Sheet machine 10 connects.
Under normal circumstances, the sulfur trioxide absorbed liquid during snakelike absorption tube 5 length ensures sample gas fully absorbs；Electron stream
Gauge 9 arranges and adjusts vacuum pump and exerts oneself, and automatically records, transmits sample information to the electronic flowmeter 9 of analyser 7；Sampling
Pipe 1 is inserted in flue, and the rear end of this sampling tube 1 is exposed at outside flue.、
In the present embodiment, sampling tube 1 is heat tracing sampling tube, and sampling tube 1 front portion is provided with ceramic filtering device, filtration etc.
Level is 2 μm.
The absorbing liquid that the sample gas being extracted tangentially adds with streamwise rapidly after leaving sampling tube 1 contacts, in flue gas
Sulfur trioxide be quickly soluble in absorbing liquid and stable existence.For ensureing that sample gas and absorbing liquid cool down rapidly, it is to avoid part three
Sulfur oxide is discharged with sample gas, and sample liquid enters analyser 7 after entering liquid trap 6.Analyser 7 is sulfur trioxide chemical analyzer, energy
Enough Accurate Analysis concentration is at 0.5mg/m3To 300mg/m3Containing sulfur trioxide liquid.Single-chip microcomputer 10 is the core of control unit
Part, connects each pump and valve and analyser 7 etc. by wire, according to the automatic control of the work-based logic programming realization system of instrument
System.
In the enforcement of the present invention, read sample gas flow Q and three oxygen of analyser 7 analysis of electronic flowmeter 9 transmission at any time
Change sulfur content M, obtain sulfur trioxide concentration can show that in flue gas, sulfur trioxide is dense by metering sample gas volume and assay office
Degree C.This device achieves automatically, high-acruracy survey, and whole device is placed in outside flue, it is simple to safeguards and overhauls.
Based on liquid absorption method online sulfur trioxide concentration measuring method in the present embodiment, comprises the steps:
S1. instrument POST.Self-inspection project generally includes electrical system, each valve opening closes pump the most normal, each
Exert oneself and whether meet the requirements, electronic flowmeter 9 and analyser 7 are carried out demarcation etc., finally check device air-tightness, and will sampling
Pipe 1 inserts in flue.
S2. fill in absorbing liquid storage 3 and can quickly absorb the absorbing liquid of sulfur trioxide in sample gas, start absorbing liquid
Transfer pump 4, first uses absorbing liquid flushing line, and absorbing liquid is carried out sulfur trioxide content mensuration, contain in this, as sulfur trioxide
The test zero point of amount feeds back to single-chip microcomputer 10.
S3. start electronic flowmeter 9 and absorbing liquid transfer pump 4, open airway electromagnetic valve 2 and exhaust tube electromagnetic valve 8, sample
Gas is fully contacted with absorbing liquid after being drawn out of sampling tube 1, enters snakelike absorption tube 5 through airway 12, and at snakelike absorption tube 5
Middle condensation, sample liquid enters in liquid trap 6, and the sample gas fully absorbing sulfur trioxide through snakelike absorption tube 5 passes through after flowing through liquid trap 6
Electromagnetic valve 8 flows in electronic flowmeter 9, electronic flowmeter 9 by sample gas flow Real-time Feedback to single-chip microcomputer 10.
S4. the sample liquid collected in liquid trap 6 enters analyser 7, the sulfur trioxide content in analyzing liquid sample, and will chemical examination
Result feeds back to single-chip microcomputer 10.
S5. after online sulfur trioxide apparatus for measuring concentration runs to the setting time, airway electromagnetic valve 2 and exhaust tube electromagnetism
Valve 8 cuts out, and absorbing liquid transfer pump 4 is opened and is rinsed absorption, analysis of pipeline.
Wherein, in sample gas, the concentration C calculation of sulfur trioxide is
C is sulfur trioxide concentration, unit mg/m in sampling flue gas3, M is sulfur trioxide content in sampling flue gas, by analyzing
Instrument 7 is analyzed and is obtained, unit mg, and Q is sampling flue gas volume, electronic flowmeter 9 measure and obtain, unit m3。
Under normal circumstances, absorbing liquid transfer pump 4 is by tangential along sample gas flow direction of the dilute sulfuric acid in absorbing liquid storage 3
Injecting in sample gas, absorbing liquid and sample gas are fully contacted tailing edge airway 12 and enter snakelike absorption tube 5, after sampling sample liquid enrichment
In liquid trap 6, flow to analyser 7.
Sulfur trioxide in flue gas is completely converted into stable ionic state sulfur trioxide by solution absorption method by the present invention,
Thus accurately analyze sulfur trioxide content in flue gas.Equipped with ceramic filtering device, (filtration grade is 2 μ in flue gas sampling pipe 1 front portion
M), sampling tube 1 is provided that the heat tracing temperature of 260 DEG C, this device are capable of withstanding high temperature, and can provide clean sample for measurement apparatus
Gas.Can quickly absorb sulfur trioxide in sample gas.After the sample gas extracted at this device leaves sampling tube 1, three oxidations in sample gas
Sulfur absorbed liquid is dissolved.Absorbing the sample liquid after sulfur trioxide to enter in snakelike absorption tube 5 with flue gas, snakelike absorption tube 5 ensures cigarette
Sulfur trioxide in gas is fully absorbed.Use single-chip microcomputer 10 technology without manpower intervention, it is only necessary to periodic maintenance, be greatly improved
The automatic operating degree of this device, in combination with lcd technology timely read test result.
The present invention absorbs rapidly sulfur trioxide in flue gas based on liquid absorption method, dissolves the sample liquid after sulfur trioxide and finally enters
Enter analyser 7, it is achieved the real-time measurement of sulfur trioxide in flue gas.Instant invention overcomes traditional method system structure complicated, can not
Measure drawback continuously, it is achieved that sulfur trioxide concentration continuous monitoring in flue gas, to sulfur trioxide in the flue gas of studying coal-fired equipment
Concentration has the directive significance of reality.
Furthermore, it is necessary to explanation, the specific embodiment described in this specification, the shape of its parts and components, it is named
Titles etc. can be different.All equivalences done according to structure, feature and the principle described in inventional idea of the present invention or simple change, all wrap
Include in the protection domain of patent of the present invention.Described can be embodied as by those skilled in the art
Example is made various amendment or supplements or use similar mode to substitute, without departing from the structure of the present invention or surmount this
Scope as defined in the claims, all should belong to protection scope of the present invention.
Claims (6)
1. an online sulfur trioxide apparatus for measuring concentration based on liquid absorption method, is characterized in that: include sampling tube, inducing QI
Pipe, airway electromagnetic valve, absorbing liquid storage, absorbing liquid transfer pump, absorbing liquid conduit, snakelike absorption tube, liquid trap, sample liquid are defeated
Send pipe, analyser, exhaust tube electromagnetic valve, exhaust tube, electronic flowmeter and single-chip microcomputer；Airway is passed through in described airway one end
Electromagnetic valve is connected with sampling tube, and the other end is connected with snakelike absorption tube；Described absorbing liquid tube at one end is positioned at absorbing liquid storage
In device, the other end is connected with airway electromagnetic valve, and absorbing liquid conduit is additionally provided with absorbing liquid transfer pump；Described liquid trap is respectively
Connecting snakelike absorption tube and sample liquid conveying pipe, sample liquid conveying pipe is also connected with analyser；Exhaust tube is passed through in described exhaust tube one end
Electromagnetic valve is connected with liquid trap, and the other end is connected with electronic flowmeter；Described single-chip microcomputer respectively with analyser, electronic flow
Meter, absorbing liquid transfer pump, airway electromagnetic valve and exhaust tube electromagnetic valve connect.
Online sulfur trioxide apparatus for measuring concentration based on liquid absorption method the most according to claim 1, is characterized in that: institute
The sampling tube stated is heat tracing sampling tube, and sampling tube is provided with ceramic filtering device.
Online sulfur trioxide apparatus for measuring concentration based on liquid absorption method the most according to claim 1, is characterized in that: institute
The snakelike absorption tube stated is vertically arranged.
4. an online sulfur trioxide concentration measuring method based on liquid absorption method, is characterized in that: based on claims 1 to 3
Based on liquid absorption method online sulfur trioxide apparatus for measuring concentration described in any one, comprises the steps:
S1. instrument POST；
S2. in absorbing liquid storage, add the absorbing liquid of enough sulfur trioxide, start absorbing liquid transfer pump, rinse by absorbing liquid
Instrument, and absorbing liquid is carried out sulfur trioxide content mensuration, the test zero point as sulfur trioxide content feeds back to single-chip microcomputer；
S3. start electronic flowmeter and absorbing liquid transfer pump, after making sample gas contact with absorbing liquid, enter snakelike suction through airway
Closed tube, and condense in snakelike absorption tube, sample liquid enters in liquid trap, and sample gas enters electronic flowmeter by exhaust tube electromagnetic valve
In, electronic flowmeter by sample gas flow Real-time Feedback to single-chip microcomputer；
S4. sample liquid is entered in analyser, calculate the sulfur trioxide content in sample liquid, and result of calculation is fed back to single-chip microcomputer；
S5. after test terminates, close airway electromagnetic valve and exhaust tube electromagnetic valve, open absorbing liquid transfer pump and pipeline is rushed
Wash.
Online sulfur trioxide concentration measuring method based on liquid absorption method the most according to claim 4, is characterized in that: institute
In step S3 stated, in sample gas, the calculation of sulfur trioxide content is:
Wherein, C is sulfur trioxide concentration, unit mg/m in sampling flue gas3, M is sulfur trioxide content in sampling flue gas, by analyzing
Instrument analysis obtains, unit mg, and Q is sampling flue gas volume, electronic flowmeter measurement obtain, unit m3。
Online sulfur trioxide concentration measuring method based on liquid absorption method the most according to claim 4, is characterized in that: institute
In step S1 stated, self-inspection project includes that electrically valve opening the most short-circuit, each Guan Bi is the most normal, pump out whether power conforms to
Ask, electronic flowmeter and analyser are demarcated, check that device air-tightness and each device are the most properly functioning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610631261.2A CN106153827A (en) | 2016-08-02 | 2016-08-02 | Online sulfur trioxide apparatus for measuring concentration based on liquid absorption method and method |
Applications Claiming Priority (1)
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| CN106596427A (en) * | 2016-12-15 | 2017-04-26 | 东南大学 | Device and method for measuring SO3 in industrial waste gas online |
| CN109632408A (en) * | 2019-02-21 | 2019-04-16 | 中国华电科工集团有限公司 | SO in a kind of flue gas3Self-operated measuring unit and method |
| CN110987839A (en) * | 2019-12-27 | 2020-04-10 | 西安热工研究院有限公司 | Intermittent sulfur trioxide online measuring equipment and method |
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