CN109632408A - SO in a kind of flue gas3Self-operated measuring unit and method - Google Patents
SO in a kind of flue gas3Self-operated measuring unit and method Download PDFInfo
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- CN109632408A CN109632408A CN201910129357.2A CN201910129357A CN109632408A CN 109632408 A CN109632408 A CN 109632408A CN 201910129357 A CN201910129357 A CN 201910129357A CN 109632408 A CN109632408 A CN 109632408A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
- G01N21/79—Photometric titration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N2001/2282—Devices for withdrawing samples in the gaseous state with cooling means
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Abstract
The present invention relates to Contaminant measurement field, in particular to SO in a kind of flue gas3Self-operated measuring unit and method.Device in the present invention includes sampling system, collection system, analysis system and control system, flue gas enters in sampling system, sampling system therein, collection system, analysis system are sequentially connected through pipeline, and the equal signal of the sampling system, collection system, analysis system is connected to control system.Sampling system includes sampling gun, filter and compressed air system, and one end of sampling gun is equipped with filter, is also connected with compressed air system through pipeline above the end of sampling gun.The present invention is based on SO in control condensation method trapping flue gas3, acid ion measurement is carried out based on acid base titration, calculates SO in flue gas in conjunction with flue gas sampling volume3Concentration can reduce exhaust gas dust to SO3Measurement influences, improves measurement accuracy and reliability, high degree of automation, easy to operate, the SO suitable for flue gas3Automatic measurement.
Description
Technical field
The present invention relates to Contaminant measurement field, in particular to SO in a kind of flue gas3Self-operated measuring unit and method.
Background technique
SO3It is the important pollutant in coal-burning power plant, harm are as follows: (1) improve acid dew point, accelerate equipment corrosion, to coal-fired electricity
Factory's safety and economy threaten；(2) increase smoke evacuation opacity or generate blue smoke, the Yi Yinfa masses are to pollution situation
Worry；(3) important precursor that fine particulates are formed aggravates air pollution；(4) ear nose larynx and respiratory system, danger are stimulated
Evil health；(5) with the adsorption potential of mercury competition active carbon, the removal effect of gas mercury is influenced.In view of the foregoing, carry out combustion
Coal-fired plant SO3Administer most important, key is SO in flue gas3Measurement.
SO3Detection technique be always difficult point, SO first3Chemical property is active, easily reacts with the generation of other substances；In cigarette
SO in gas3Concentration relative to SO2Concentration is smaller, and SO2To SO3Measurement have a huge impact, so measurement be also easy to produce mistake
Difference；SO3Sulfuric acid is generated in conjunction with vapor in flue gas, sulfuric acid generates azeotropic mixture in 500 DEG C or less Shi Huiyu water；At a temperature of
When drop, sulfuric acid is easily condensed, and condensed sulfuric acid can be reacted with flue and measurement pipeline generation, causes measurement result relatively low.So that
In in the prior art, SO3Low measurement accuracy, poor reliability, the degree of automation it is not strong.
Summary of the invention
The object of the present invention is to provide SO in a kind of flue gas3Self-operated measuring unit additionally provides SO in a kind of flue gas3From
Dynamic measurement method, to solve the above problems.
In order to solve the above technical problems, the present invention adopts the following technical scheme that:
SO in a kind of flue gas3Self-operated measuring unit includes sampling system, collection system, analysis system and control system, cigarette
Gas 1 enters in sampling system, and sampling system therein, collection system, analysis system are sequentially connected through pipeline, and the sampling is
The equal signal of system, collection system, analysis system is connected to control system；Wherein sampling system includes sampling gun, filter and compression
Air system, one end of the sampling gun are equipped with filter, are also connected with compression through pipeline above the end of the sampling gun
Air system；Sampling system further includes through the sequentially connected non-return valve of pipeline, flowmeter, aspiration pump, and the non-return valve is far from stream
One end of meter is connected to sample collection bottle through pipeline；Collection system includes condenser, sintered glass filter, thermostatic water-circulator bath
Pot, elution liquid container and sample collection bottle, the elution liquid container, condenser, sintered glass filter, sample collection bottle are through pipeline
It is sequentially connected with, and sintered glass filter is built in the bottom of condenser, one end of the thermostatic water-circulator bath pot is connected through pipeline
Above the side of condenser, the other end of the thermostatic water-circulator bath pot is connected to below the side of condenser through pipeline, institute
The top for stating condenser is also connected to the end of sampling gun through pipeline；Analysis system includes colorimetric device, blender, indicator appearance
Device and alkali liquor container, the sample collection bottle, marker container, alkali liquor container are connect with colorimetric device by the road respectively, described
Blender is additionally provided with below colorimetric device.
Sampling system is made of sampling gun, filter, compressed air system etc., flue gas heat temperature raising in sampling gun, warp
Filter removes chalk dust removing；After sampling, starting compressed air system backwashes sampling gun and filter；Sampling system
In aspiration pump for extracting flue gas；Flowmeter extracts exhaust gas volumn for calculating；Sampling flue need to be returned in view of exhaust gas, is also set up
Non-return valve prevents the flue gas from playing a reversed role.Collection system by condenser, sintered glass filter, thermostatic water-circulator bath pot, elution liquid container,
Sample collection bottle etc. forms, SO in flue gas3It is trapped by condenser and sintered glass filter, the elution through being flowed out in elution liquid container
Enter sample collection bottle after liquid washing；Wherein, thermostatic water-circulator bath pot is connected with condenser, and condenser is by glass tube and inside
Helix tube composition, glass tube and helix tube exterior space water-filling, are provided by thermostatic water-circulator bath pot, so that condenser is protected
65 DEG C -80 DEG C of constant temperature is held, if temperature is too low, moisture can be condensed, and influence measurement result；If temperature is excessively high, sulfur trioxide
It cannot all trap, influence measurement accuracy.Analysis system is by groups such as colorimetric device, blender, marker container, alkali liquor containers
At extracting a certain amount of leacheate from sample collection bottle and enter colorimetric device and the indicator in marker container is added, starting is stirred
Device is mixed, the lye in alkali liquor container is then added until solution colour is in order setting with given pace.Control system
Logic built module, control sampling system, collection system, analysis system according to each measuring process sequence and acquire movement letter respectively
It number is calculated.
SO in flue gas above-mentioned3Self-operated measuring unit further includes than color light source, and control system is built-in with controller, the ratio
Color light source is electrically connected at controller.The absorbance of wherein colorimetric optical source wavelength 530nm, different colours are different, feedback to control
The signal of device is different, judges titration end-point whereby；Controller is a part of control system, feedbacks and controls titration for signal
Terminal.
SO in flue gas above-mentioned3Self-operated measuring unit further includes valve, is pacified on the sampling gun close to one end of filter
Equipped with valve；Valve is also installed in connecting pipe between the sampling gun and condenser；The condenser and leacheate hold
Connecting pipe between device is also equipped with valve.
SO in flue gas above-mentioned3Self-operated measuring unit further includes peristaltic pump a, peristaltic pump b, peristaltic pump c, peristaltic pump d, described
Connecting pipe between condenser and elution liquid container is equipped with peristaltic pump a, between the sample collection bottle and colorimetric device
Connecting pipe also installs peristaltic pump b, and the connecting pipe between the marker container and colorimetric device is equipped with peristaltic pump c, institute
It states the connecting pipe between alkali liquor container and colorimetric device and peristaltic pump d is installed.
SO in flue gas above-mentioned3Self-operated measuring unit, the sampling gun are heat tracing sampling gun, and the filter is ceramic mistake
Filter, the colorimetric device are cuvette, and the blender is magnetic stirring apparatus.
SO in a kind of flue gas3Method for automatic measurement, using SO in flue gas above-mentioned3Self-operated measuring unit, including following mistake
Journey:
After device starting, sampling gun and thermostatic water-circulator bath pot are begun to warm up, after design temperature to be achieved, starting pumping
Pump；
Sampling gun carries out heat temperature raising to the flue gas of extraction, and flue gas is after filter removes dust, into condenser, cold
Under the action of condenser and sintered glass filter, SO in flue gas3It is captured；
Peristaltic pump a on starting elution liquid container and condenser connecting pipe extracts leacheate in 100ml elution liquid container
Enter sample collection bottle after being rinsed to condenser and sintered glass filter, be captured SO3The flue gas discharged afterwards is through non-return valve
Return to former flue；
The instruction that 10ml leacheate enters colorimetric device, and is added in 0.25ml marker container is extracted from sample collection bottle
Agent starts blender；
It is then titrated with the lye that the rate of 5ml/min is added in alkali liquor container, (is than color light source according to absorbance
530nm light source, different colours liquid absorbance is different, and control system feedback signal is different, and then judges titration end-point) determine drop
Determine terminal；
According to fume extraction amount and alkali lye consumption amount, control system calculates SO in flue gas automatically3Concentration；
Every time after measurement, starting compressed air system backwashes sampling gun and filter.
Further, SO in flue gas above-mentioned3Method for automatic measurement, according to fume extraction amount and alkali lye consumption amount, control
System calculates SO in flue gas automatically3Concentration；Specific calculation formula are as follows:
Wherein:For sulfur trioxide concentration, mg/m in flue gas3；CNaOHFor Concentration of Sodium Hydroxide Solution Standard, mol/L；
VNaOHStandard solution of sodium hydroxide volume, mL are consumed for titration；Vgas is to extract flue gas volume, m3。
SO in flue gas above-mentioned3Method for automatic measurement, the design temperature of sampling gun are 260 DEG C；Thermostatic water-circulator bath pot
Design temperature is 65 DEG C~80 DEG C.
SO in flue gas above-mentioned3Method for automatic measurement, the lye in alkali liquor container is standard solution of sodium hydroxide, and concentration is
0.1mol/L；Indicator A in marker container is bromophenol blue indicator；Eluting the leacheate A in liquid container is with bromophenol blue
5% neutral aqueous isopropanol is adjusted to for indicator.
SO in flue gas above-mentioned3Method for automatic measurement, the lye in alkali liquor container is standard solution of sodium hydroxide, and concentration is
0.5mol/L；Indicator B in marker container is the mixed indicator of bromocresol green and methyl red, wherein bromocresol green and first
The red mass ratio of base is 1:1；Leacheate B in elution liquid container is to be adjusted to neutrality using bromocresol green and methyl red as indicator
5% aqueous isopropanol, wherein bromocresol green and methyl red mass ratio are also 1:1.According to SO in flue gas3The difference of concentration, it is optional
Selecting the lye, two kinds of indicator and two kinds of leacheates of various concentration is all applicable, configuration method establishing criteria DL/T 998-
2016 " wet desulfurization of flue gas by limestone-gypsum method device performance acceptance test specifications ".
Compared with prior art, the invention has the beneficial effects that:
(1) back purge system of sampling gun and filter, i.e. compressed air system are increased, SO is improved3Measurement essence
Degree；
(2) using SO in control condensation method trapping flue gas3, improve the reliability of measurement；
(3) SO is calculated by test acid ion content3Concentration；
(4) acid ion concentration is measured using acid-base titration.
Comprehensive, the present invention is based on SO in control condensation method trapping flue gas3, acid ion measurement is carried out based on acid base titration,
SO in flue gas is calculated in conjunction with flue gas sampling volume3Concentration can reduce exhaust gas dust to SO3Measurement influence, improve measurement accuracy and
Reliability, high degree of automation, easy to operate, the SO suitable for flue gas3Automatic measurement.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is control logic flow chart of the present invention in practical application.
The meaning of appended drawing reference: 1- flue gas, 2- sampling gun, 3- filter, 4- compressed air system, 5- valve, 6- condensation
Device, 7- sintered glass filter, 8- thermostatic water-circulator bath pot, 9- elute liquid container, 10a- peristaltic pump a, 10b- peristaltic pump b, 10c-
Peristaltic pump c, 10d- peristaltic pump d, 11- sample collection bottle, 12- colorimetric device, 13- blender, 14- marker container, 15- lye
Container, 16- is than color light source, 17- controller, 18- non-return valve, 19- flowmeter, 20- aspiration pump.
The present invention is further illustrated with reference to the accompanying drawings and detailed description.
Specific embodiment
The embodiment of the present invention 1: as depicted in figs. 1 and 2, SO in a kind of flue gas3Self-operated measuring unit include sampling system,
Collection system, analysis system and control system, flue gas 1 enter in sampling system, sampling system therein, collection system, analysis
System is sequentially connected through pipeline, and the equal signal of the sampling system, collection system, analysis system is connected to control system；Wherein adopt
Sample system includes sampling gun 2, filter 3 and compressed air system 4, and one end of the sampling gun 2 is equipped with filter 3, described
Compressed air system 4 also is connected with through pipeline above the end of sampling gun 2；Sampling system further includes sequentially connected inverse through pipeline
Only valve 18, flowmeter 19, aspiration pump 20, the non-return valve 18 are connected to sample collection bottle through pipeline far from one end of flowmeter 19
11；Collection system includes condenser 6, sintered glass filter 7, thermostatic water-circulator bath pot 8, elution liquid container 9 and sample collection bottle
11, the elution liquid container 9, condenser 6, sintered glass filter 7, sample collection bottle 11 are sequentially connected with through pipeline, and are sintered glass
Glass filter 7 is built in the bottom of condenser 6, and one end of the thermostatic water-circulator bath pot 8 is connected to the side of condenser 6 through pipeline
The other end of top, the thermostatic water-circulator bath pot 8 is connected to below the side of condenser 6 through pipeline, the top of the condenser 6
Portion is also connected to the end of sampling gun 2 through pipeline；Analysis system includes colorimetric device 12, blender 13,14 and of marker container
Alkali liquor container 15, the sample collection bottle 11, marker container 14, alkali liquor container 15 connect with colorimetric device 12 by the road respectively
It connects, is additionally provided with blender 13 below the colorimetric device 12.
Sampling system is made of sampling gun 2, filter 3, compressed air system 4 etc., and flue gas 1 heats in sampling gun 2 to be risen
Temperature removes chalk dust removing through filter 3；After sampling, starting compressed air system 4 recoils to sampling gun 2 and filter 3
It washes；Aspiration pump 20 in sampling system is for extracting flue gas；Flowmeter 19 extracts exhaust gas volumn for calculating；It needs to return in view of exhaust gas
Flue is sampled, being also provided with non-return valve 18 prevents flue gas from playing a reversed role.Collection system is by condenser 6, sintered glass filter 7, super perseverance
Warm water bath 8, elution liquid container 9, sample collection bottle 11 etc. form, SO in flue gas 13It is caught by condenser 6 and sintered glass filter 7
Collection enters sample collection bottle 11 after the leacheate washing through flowing out in elution liquid container 9；Wherein, thermostatic water-circulator bath pot 8 and cold
Condenser 6 is connected, and condenser 6 is made of glass tube and internal helix tube, glass tube and helix tube exterior space water-filling,
It is provided by thermostatic water-circulator bath pot 8, so that condenser 6 keeps 65 DEG C -80 DEG C of constant temperature, if temperature is too low, moisture can be condensed,
Influence measurement result；If temperature is excessively high, sulfur trioxide cannot be trapped all, influence measurement accuracy.Analysis system is filled by colorimetric
Set 12, blender 13, marker container 14, alkali liquor container 15 etc. composition, from sample collection bottle 11 extract a certain amount of leacheate into
The indicator for entering colorimetric device 12 and being added in marker container 14 starts blender 13, and lye then is added with given pace
Lye in container 15 is until solution colour is in order setting.Control system logic built module, control sampling system,
Collection system, analysis system according to each measuring process sequence and acquire action signal and are calculated respectively.Control system is market
Upper conventional use of system, such as PLC controller etc..
Embodiment 2: as depicted in figs. 1 and 2, SO in a kind of flue gas3Self-operated measuring unit includes sampling system, collects system
System, analysis system and control system, flue gas 1 enter in sampling system, sampling system therein, collection system, analysis system warp
Pipeline is sequentially connected, and the equal signal of the sampling system, collection system, analysis system is connected to control system；Wherein sampling system
Including sampling gun 2, filter 3 and compressed air system 4, one end of the sampling gun 2 is equipped with filter 3, the sampling gun 2
End above be also connected with compressed air system 4 through pipeline；Sampling system further include through the sequentially connected non-return valve 18 of pipeline,
Flowmeter 19, aspiration pump 20, the described one end of non-return valve 18 far from flowmeter 19 are connected to sample collection bottle 11 through pipeline；It collects
System includes condenser 6, sintered glass filter 7, thermostatic water-circulator bath pot 8, elutes liquid container 9 and sample collection bottle 11, described
Elution liquid container 9, condenser 6, sintered glass filter 7, sample collection bottle 11 are sequentially connected with through pipeline, and sintered glass filter 7
It is built in the bottom of condenser 6, one end of the thermostatic water-circulator bath pot 8 is connected to above the side of condenser 6 through pipeline, institute
The other end for stating thermostatic water-circulator bath pot 8 is connected to below the side of condenser 6 through pipeline, and the top of the condenser 6 also passes through
Pipeline is connected to the end of sampling gun 2；Analysis system includes that colorimetric device 12, blender 13, marker container 14 and lye hold
Device 15, the sample collection bottle 11, marker container 14, alkali liquor container 15 are connect with colorimetric device 12 by the road respectively, described
Blender 13 is additionally provided with below colorimetric device 12.Sampling system is made of sampling gun 2, filter 3, compressed air system 4 etc., cigarette
The heat temperature raising in sampling gun 2 of gas 1 removes chalk dust removing through filter 3；After sampling, start compressed air system 4 to sampling gun
2 and filter 3 backwashed；Aspiration pump 20 in sampling system is for extracting flue gas；Flowmeter 19 extracts cigarette for calculating
Tolerance；Sampling flue need to be returned in view of exhaust gas, being also provided with non-return valve 18 prevents flue gas from playing a reversed role.Collection system is by condenser 6, burning
Tie the compositions such as glass filter 7, thermostatic water-circulator bath pot 8, elution liquid container 9, sample collection bottle 11, SO in flue gas 13By condenser
6 and sintered glass filter 7 trap, through elution liquid container 9 in flow out leacheate washing after enter sample collection bottle 11；Wherein,
Thermostatic water-circulator bath pot 8 is connected with condenser 6, and condenser 6 is made of glass tube and internal helix tube, glass tube and spiral shell
Coil exterior space water-filling, is provided by thermostatic water-circulator bath pot 8, so that condenser 6 keeps 65 DEG C -80 DEG C of constant temperature, if
Temperature is too low, and moisture can condense, and influences measurement result；If temperature is excessively high, sulfur trioxide cannot be trapped all, influence measurement essence
Degree.Analysis system is made of colorimetric device 12, blender 13, marker container 14, alkali liquor container 15 etc., from sample collection bottle 11
The indicator that a certain amount of leacheate enters colorimetric device 12 and is added in marker container 14 is extracted, starts blender 13, then
The lye in alkali liquor container 15 is added until solution colour is in order setting with given pace.Control system logic built
Module, control sampling system, collection system, analysis system according to each measuring process sequence and acquire action signal and are counted respectively
It calculates.Control system is conventional use of system, such as PLC controller etc. on the market.
SO in flue gas3Self-operated measuring unit further includes than color light source 16, and control system is built-in with controller 17, the colorimetric
Light source 16 is electrically connected at controller 17.Wherein than 16 wavelength 530nm of color light source, the absorbance of different colours is different, and feedback arrives
The signal of controller 17 is different, judges titration end-point whereby；Controller 17 is a part of control system, simultaneously for signal feedback
Control titration end-point.SO in flue gas3Self-operated measuring unit further includes valve 5, close to one end of filter 3 on the sampling gun 2
Valve 5 is installed；Valve 5 is also installed in connecting pipe between the sampling gun 2 and condenser 6；The condenser 6 and leaching
Connecting pipe between wash liquor vessel 9 is also equipped with valve 5.SO in flue gas3Self-operated measuring unit further includes peristaltic pump a10a, compacted
Dynamic pump b10b, peristaltic pump c10c, peristaltic pump d10d, the connecting pipe between the condenser 6 and elution liquid container 9 are equipped with compacted
Dynamic pump a10a, the connecting pipe between the sample collection bottle 11 and colorimetric device 12 are equipped with peristaltic pump b10b, the instruction
Connecting pipe between agent container 14 and colorimetric device 12 is equipped with peristaltic pump c10c, the alkali liquor container 15 and colorimetric device 12
Between connecting pipe peristaltic pump d10d is installed.
Specifically, the sampling gun 2 is heat tracing sampling gun, the filter 3 is ceramic filter, the colorimetric device 12
For cuvette, the blender 13 is magnetic stirring apparatus.
Embodiment 3: as depicted in figs. 1 and 2, SO in a kind of flue gas3Method for automatic measurement, using SO in flue gas above-mentioned3From
Dynamic measuring device, including following procedure:
After device starting, sampling gun 2 and thermostatic water-circulator bath pot 8 are begun to warm up, after design temperature to be achieved, starting pumping
Pump 20；
The flue gases 1 of 2 pairs of sampling gun extractions carry out heat temperature raisings, and flue gas is after filter 3 removes chalk dust removing, into condenser 6,
Under the action of condenser 6 and sintered glass filter 7, SO in flue gas3It is captured；
Peristaltic pump a10a on starting elution liquid container 9 and 6 connecting pipe of condenser is extracted in 100ml elution liquid container 9
Leacheate enters sample collection bottle 11 after being rinsed to condenser 6 and sintered glass filter 7, and be captured SO3The cigarette discharged afterwards
Gas returns to former flue through non-return valve 18；
10ml leacheate is extracted from sample collection bottle 11 and enters colorimetric device 12, and is added in 0.25ml marker container 14
Indicator, start blender 13；
It is then titrated with the lye that the rate of 5ml/min is added in alkali liquor container 15, color light source (is compared according to absorbance
16 be 530nm light source, and different colours liquid absorbance is different, and control system feedback signal is different, and then judges titration end-point) really
Determine titration end-point；
According to fume extraction amount and alkali lye consumption amount, control system calculates SO in flue gas automatically3Concentration；
Every time after measurement, starting compressed air system 4 backwashes sampling gun 2 and filter 3.
Further, according to fume extraction amount and alkali lye consumption amount, control system calculates SO in flue gas automatically3Concentration；Tool
The calculation formula of body are as follows:
Wherein:For sulfur trioxide concentration, mg/m in flue gas3；CNaOHFor Concentration of Sodium Hydroxide Solution Standard, mol/L；
VNaOHStandard solution of sodium hydroxide volume, mL are consumed for titration；Vgas is to extract flue gas volume, m3。
Specifically, the design temperature of sampling gun 2 is 260 DEG C；The design temperature of thermostatic water-circulator bath pot 8 is 65 DEG C~80
℃。
Further, the lye in alkali liquor container 15 is standard solution of sodium hydroxide, concentration 0.1mol/L；Indicator holds
Indicator A in device 14 is bromophenol blue indicator；Leacheate A in elution liquid container 9 is in being adjusted to by indicator of bromophenol blue
5% aqueous isopropanol of property.
Further, the lye in alkali liquor container 15 is standard solution of sodium hydroxide, concentration 0.5mol/L；Indicator holds
Indicator B in device 14 is the mixed indicator of bromocresol green and methyl red, and wherein bromocresol green and methyl red mass ratio are 1:
1；Leacheate B in elution liquid container 9 is that 5% neutral aqueous isopropanol is adjusted to as indicator using bromocresol green and methyl red,
Wherein bromocresol green and methyl red mass ratio are also 1:1.According to SO in flue gas3The alkali of various concentration may be selected in the difference of concentration
Liquid, two kinds of indicator and two kinds of leacheates are all applicable, configuration method establishing criteria DL/T 998-2016 " limestone-gypsums
Wet flue gas desulfurizer performances acceptance test specification ".
The working principle of the invention: after the device starting in the present invention, sampling gun 2 and thermostatic water-circulator bath pot 8 start to add
Heat after design temperature to be achieved, starts aspiration pump 20；Flue gas is after filter 3 removes chalk dust removing, into condenser 6, SO3Cold
It is trapped in condenser 6 and sintered glass filter 7；Peristaltic pump a10a on starting elution liquid container 9 and 6 connecting pipe of condenser, takes out
Enter sample collection bottle 11, exhaust gas (trapping SO after taking 100ml leacheate to be rinsed condenser 6 and sintered glass filter 73
The flue gas of equipment exhausting afterwards) through non-return valve 18 return to former flue；10ml leacheate is extracted from sample collection bottle 11,0.25ml is added
Indicator in marker container 14, start blender 13, extract alkali liquor container 15 in lye and with the rate of 5ml/min into
Row titration；It (is 530nm light source than color light source 16, different colours liquid absorbance is different, control system feedback letter according to absorbance
Number difference, and then judge titration end-point) determine titration end-point, acid ion concentration in solution is calculated, in conjunction with pumping volume, is calculated
SO in flue gas3Concentration.Formula:WhereinFor sulfur trioxide concentration, mg/m in flue gas3；
CNaOHFor Concentration of Sodium Hydroxide Solution Standard, mol/L；VNaOHStandard solution of sodium hydroxide volume, mL are consumed for titration；Vgas is
Extract flue gas volume, m3。
Claims (10)
1. SO in a kind of flue gas3Self-operated measuring unit, which is characterized in that including sampling system, collection system, analysis system and control
System processed, flue gas (1) enter in sampling system, and sampling system therein, collection system, analysis system are sequentially connected through pipeline,
The equal signal of the sampling system, collection system, analysis system is connected to control system；
Wherein sampling system includes sampling gun (2), filter (3) and compressed air system (4), one end of the sampling gun (2)
It is equipped with filter (3), is also connected with compressed air system (4) through pipeline above the end of the sampling gun (2)；
Sampling system further includes through the sequentially connected non-return valve of pipeline (18), flowmeter (19), aspiration pump (20), the non-return valve
(18) one end far from flowmeter (19) is connected to sample collection bottle (11) through pipeline；
Collection system includes condenser (6), sintered glass filter (7), thermostatic water-circulator bath pot (8), elution liquid container (9) and sample
Product receiving flask (11), the elution liquid container (9), condenser (6), sintered glass filter (7), sample collection bottle (11) are through pipeline
It is sequentially connected with, and sintered glass filter (7) is built in the bottom of condenser (6), one end warp of the thermostatic water-circulator bath pot (8)
Pipeline is connected to above the side of condenser (6), and the other end of the thermostatic water-circulator bath pot (8) is connected to condenser through pipeline
(6) below side, the top of the condenser (6) is also connected to the end of sampling gun (2) through pipeline；
Analysis system includes colorimetric device (12), blender (13), marker container (14) and alkali liquor container (15), the sample
Receiving flask (11), marker container (14), alkali liquor container (15) are connect with colorimetric device (12) by the road respectively, the colorimetric dress
It sets and is additionally provided with blender (13) below (12).
2. SO in flue gas according to claim 13Self-operated measuring unit, which is characterized in that further include than color light source (16),
Control system is built-in with controller (17), described to be electrically connected at controller (17) than color light source (16).
3. SO in flue gas according to claim 13Self-operated measuring unit, which is characterized in that it further include valve (5), it is described to adopt
One end on sample rifle (2) close to filter (3) is equipped with valve (5)；Connection between the sampling gun (2) and condenser (6)
Valve (5) are also installed on pipeline；Connecting pipe between the condenser (6) and elution liquid container (9) is also equipped with valve
(5)。
4. SO in flue gas according to claim 13Self-operated measuring unit, which is characterized in that further include peristaltic pump a (10a),
Peristaltic pump b (10b), peristaltic pump c (10c), peristaltic pump d (10d), the connection between the condenser (6) and elution liquid container (9)
Pipe installing has peristaltic pump a (10a), and the connecting pipe between the sample collection bottle (11) and colorimetric device (12) is equipped with compacted
Dynamic pump b (10b), the connecting pipe between the marker container (14) and colorimetric device (12) are equipped with peristaltic pump c (10c),
Connecting pipe between the alkali liquor container (15) and colorimetric device (12) is equipped with peristaltic pump d (10d).
5. SO in flue gas according to claim 13Self-operated measuring unit, which is characterized in that the sampling gun (2) is heat tracing
Sampling gun, the filter (3) are ceramic filter, and the colorimetric device (12) is cuvette, and the blender (13) is magnetic
Power blender.
6. SO in a kind of flue gas3Method for automatic measurement, using SO in any flue gas of claim 1-53Automatic measurement dress
It sets, which is characterized in that including following procedure:
After device starting, sampling gun (2) and thermostatic water-circulator bath pot (8) are begun to warm up, after design temperature to be achieved, starting pumping
It pumps (20)；
Sampling gun (2) carries out heat temperature raising to the flue gas (1) of extraction, and flue gas is after filter (3) removes chalk dust removing, into condenser
(6), under the action of condenser (6) and sintered glass filter (7), SO in flue gas3It is captured；
Peristaltic pump a (10a) in starting elution liquid container (9) and condenser (6) connecting pipe extracts 100ml and elutes liquid container
(9) enter sample collection bottle (11) after leacheate is rinsed condenser (6) and sintered glass filter (7) in, be captured SO3
The flue gas discharged afterwards returns to former flue through non-return valve (18)；
10ml leacheate is extracted from sample collection bottle (11) and enters colorimetric device (12), and 0.25ml marker container (14) are added
In indicator, start blender (13)；
It is then titrated with the lye that the rate of 5ml/min is added in alkali liquor container (15), determines titration eventually according to absorbance
Point；
According to fume extraction amount and alkali lye consumption amount, control system calculates SO in flue gas automatically3Concentration；
Every time after measurement, starting compressed air system (4) backwashes sampling gun (2) and filter (3).
7. SO in flue gas according to claim 63Method for automatic measurement, which is characterized in that according to fume extraction amount and lye
Consumption, control system calculate SO in flue gas automatically3Concentration；Specific calculation formula are as follows:
Wherein:For sulfur trioxide concentration, mg/m in flue gas3；CNaOHFor Concentration of Sodium Hydroxide Solution Standard, mol/L；VNaOHFor
Titration consumption standard solution of sodium hydroxide volume, mL；Vgas is to extract flue gas volume, m3。
8. SO in flue gas according to claim 63Method for automatic measurement, which is characterized in that the design temperature of sampling gun (2)
It is 260 DEG C；The design temperature of thermostatic water-circulator bath pot (8) is 65 DEG C~80 DEG C.
9. SO in flue gas according to claim 73Method for automatic measurement, which is characterized in that the lye in alkali liquor container (15)
For standard solution of sodium hydroxide, concentration 0.1mol/L；Indicator A in marker container (14) is bromophenol blue indicator；Leaching
Leacheate A in wash liquor vessel (9) is that 5% neutral aqueous isopropanol is adjusted to by indicator of bromophenol blue.
10. SO in flue gas according to claim 73Method for automatic measurement, which is characterized in that the alkali in alkali liquor container (15)
Liquid is standard solution of sodium hydroxide, concentration 0.5mol/L；Indicator B in marker container (14) is bromocresol green and methyl
Red mixed indicator, wherein bromocresol green and methyl red mass ratio are 1:1；Eluting the leacheate B in liquid container (9) is with bromine
Cresols is green and methyl red is that indicator is adjusted to 5% neutral aqueous isopropanol, and wherein bromocresol green and methyl red mass ratio are also
1:1。
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| CN111487094A (en) * | 2020-05-25 | 2020-08-04 | 中煤科工集团重庆研究院有限公司 | SO in the exhaust gas3Detection preprocessing system and using method thereof |
| CN114768291A (en) * | 2022-03-01 | 2022-07-22 | 大唐国际发电股份有限公司张家口发电厂 | SO3 quick sampling device in flue gas |
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