CN106289884B - A kind of SO3The method of on-line checking - Google Patents

A kind of SO3The method of on-line checking Download PDF

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Publication number
CN106289884B
CN106289884B CN201610804569.2A CN201610804569A CN106289884B CN 106289884 B CN106289884 B CN 106289884B CN 201610804569 A CN201610804569 A CN 201610804569A CN 106289884 B CN106289884 B CN 106289884B
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flue gas
connecting tube
salt
absorption plant
concentration
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CN106289884A (en
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董勇
张立强
李玉忠
崔琳
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Jinan tairuicheng Thermal Power Engineering Co., Ltd
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Shandong Energy Technology Co Ltd
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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
    • 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
    • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
    • G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode

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  • Chemical Kinetics & Catalysis (AREA)
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  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

The invention discloses a kind of SO3The method and device of on-line checking, method are to detect the initial concentration of original HCl in flue gas；By flue gas temperature control after acquisition to being higher than SO3Adiabatic condensation temperature, then the flue gas after temperature control is reacted with villaumite, and the temperature for controlling reaction is higher than SO3Adiabatic condensation temperature detects the concentration of HCl in flue gas after reacting, the concentration of the HCl of actual output is obtained according to the initial concentration of HCl original in the concentration of HCl and flue gas, obtains SO in flue gas according to the concentration calculation of the HCl of actual output3Concentration, wherein villaumite be can be with SO3Reaction generates the chloride of HCl or the mixture of several chloride.Smoke collecting component, reaction part and HCl detection part are sequentially connected, reaction part is blank component and salt absorption piece in parallel, smoke power component makes smoke collecting component acquire flue gas, and smoke power component can provide power to acquire the conveying of flue gas, temperature-controlled member control temperature is above SO3Adiabatic condensation temperature holds villaumite in salt absorption piece.

Description

A kind of SO3The method of on-line checking
Technical field
The present invention relates to the detection method of coal-fired flue-gas ingredient, in particular to a kind of SO3The method and device of on-line checking.
Background technique
The energy resource structure in China is based on coal, and in coal combustion process, element sulphur therein is most of with SO2Form exists In flue gas, fraction SO2It is converted into SO3, under normal circumstances, the about SO of 1-2% in burner hearth2It is oxidized to SO3.This Outside, with the promulgation of thermal power plant's Air Pollutant Emission new standard " GB-13223-2011 ", flue gas SCR denitration technique is in thermoelectricity Factory is widely applied.Commercial SCR catalyst can promote SO2Oxidation, improve SO in flue gas3Content, it is coal-fired at present SO2Contamination control has reached the level of minimum discharge, SO3Contamination control become current focus of attention.
SO3It is a kind of serious pollution gas of harm, harm is mainly reflected in following three aspect: (one) works as flue gas In SO3When crossing content and being more than 10ppm, atmospheric environment will be caused seriously to pollute, the SO in flue gas3It can be in conjunction with vapor Generation and its small sulfuric acid droplet, reduce the transparency of flue gas, lead to the generation of " Lan Yu " phenomenon.(2), SO in flue gas3Contain The increase of amount can increase substantially the acid dew point of flue gas, cause corrosion phenomenon to boiler system.(3), for SCR denitration process, SO3It can also be with excessive NH3Reaction generates ammonium nitrate and nitric acid hydrogen ammonium, the micropore on blocking catalyst surface shorten making for catalyst With the service life, SCR is reacted and generates adverse effect.SO3On-line checking be realize SO3Control the important prerequisite of supervision, it is therefore desirable to High-precision SO3Online detection instrument.
SO at present3The method of measurement is divided into two class of sampling analysis method and on_line detection method.Sampling analysis method mainly includes control Condensation method, spiral tube method and isopropanol absorption process processed.Control condensation method and spiral tube method be all by flue gas at a certain temperature It is condensed, makes the SO in flue gas3It is condensed in collector, then rinses collector with deionized water, by detection water Sulfate ion content obtains SO in flue gas3Content；It is to realize SO by isopropanol that isopropanol, which absorbs rule,3Absorption, most It is dissolved in the content of water detection sulfate ion afterwards.Control condensation method, spiral tube method and isopropanol absorption process cannot achieve SO3Height Precision on-line measurement, and smoke sampling and it is filtered into pyroprocess, and SO3Condensation and absorption be chilling process, therefore In the presence of the condensation segment from high temperature to low temperature, SO during being somebody's turn to do3It can be deposited in tube wall, and due to SO during low temperature absorption3By Gaseous state is converted into drop or aerosol, causes to absorb not exclusively, these all have adverse effect on the precision of measurement. SO3? Line detecting method mainly includes the online test method of Pentol company and the SO of Zhejiang University's exploitation3Online test method. The online detection instrument of Pentol company is able to achieve SO3On-line checking, but this method still uses isopropanol to SO3It is inhaled It receives, then absorbing liquid is detected again；The SO of Zhejiang University's (application number 201310376879.5) exploitation3Online detection instrument Absorbing liquid intermediate ion concentration is detected afterwards.The core of both online test methods is still that control condensation method and isopropanol absorb Method not can avoid SO in condensation process3Deposition and absorb incomplete problem, influence measurement accuracy；In addition, both are online The realization of detection method mainly uses spectrophotometer method, and there are problems for portability, the stability of instrument.
A variety of SO are had disclosed and developed in this field3Measuring technology, application No. is 201310376879.5 patents Disclose the on-line measuring device and method of sulfur trioxide in a kind of flue gas, device include smoke collecting unit, gas-liquid separator, Vapor detection unit, the first NaOH solution tank NaOH, liquid phase detection unit and digital control unit.The invention realizes SO in flue gas3? Line measurement, to the SO in flue gas3It is sampled, and analyzes SO3Content.This method realizes SO with cryogenic condensation3Separation, Then with the SO after isopropanol or water absorption and separation3And formed and precipitated with barium salt, liquid phase is carried out finally by spectrophotometer Detection obtains SO3Content, this method uses the method for sampling of cryogenic condensation, SO in sampling process3Deposition and absorb incomplete The problem of, measurement accuracy is influenced, and more complex, is not easy to on-site test.
Patent 201410125511.6 discloses a kind of Detection & Controling method of sulfur trioxide gas bulk concentration: using light source Light beam is issued, the one end for passing the beam through reaction cavity reaches the other end.By the resistance value size for measuring photo resistance Detect the concentration of sulfur trioxide gas in reaction cavity.This method is easy to operate, but by flying dust in flue gas, vapor and its The influence of his component, it is difficult to accurately measure SO3Content.
Application No. is 201510562239.2 inventions to provide a kind of sulfur trioxide analysis instrument and method, passes through sampling Rifle acquires flue gas, then mixes in drexel bottle with aqueous isopropanol, sulfur trioxide is absorbed as sulfate ion；By sample liquid It pumps to reactor, is chemically reacted with chloranilic acid barium, generate barium sulfate and release the chloranilic acid ion of equivalent；Benefit With the chloranilic acid ion concentration in spectrophotometer measurement reaction solution, so that the sulfate ion concentration in sample liquid is obtained, Calculate the sulfur trioxide concentration in flue gas.This method still falls within isopropanol absorption process, and instrument is various, complicated for operation, and nothing The shortcomings that method avoids low temperature absorption from bringing.
Application number 201520621768.0 discloses a kind of portable sulfur trioxide chemical absorbing automatic sampling apparatus, including Probe tube, filter, chemical absorption arrangement, control device.This method is using absorbing liquid to the SO in sampling flue gas3It is inhaled It receives, due to SO under low temperature3For sulfuric acid mist, sulfuric acid droplets state, exists and absorb incomplete problem, influence measurement accuracy.
Summary of the invention
To overcome the shortcomings of existing technologies, the present invention provides a kind of SO3The method and device of on-line checking has measurement The advantages that precision is high, stable, easy to operate, not by the interference of human factor.
A kind of SO3The method of on-line checking, by flue gas temperature control after acquisition to being higher than SO3Adiabatic condensation temperature, then by the cigarette after temperature control Gas is reacted with villaumite, and the temperature for controlling reaction is higher than SO3Adiabatic condensation temperature detects the concentration of HCl in flue gas after reacting, root The concentration that the HCl of actual output is obtained according to the initial concentration of original HCl in the concentration and flue gas, according to the HCl's of actual output Concentration calculation obtains SO in flue gas3Concentration, wherein the villaumite be can be with SO3Reaction generates the chloride or several of HCl The mixture of kind chloride.
The SO3Adiabatic condensation temperature is gaseous state SO3In conjunction with vapor and the maximum temperature of liquid can be converted into.
Preferably, the flue gas not contacted with villaumite and the initial concentration for detecting original HCl in flue gas are acquired；Then detection with The concentration of HCl in flue gas after villaumite contact, reaction, the concentration of HCl subtracts the initial concentration of original HCl in the flue gas after reaction The concentration for obtaining the HCl of actual output obtains SO in flue gas according to the concentration calculation of the HCl of actual output3Concentration.
It can the step of the concentration of HCl in flue gas after the step of detecting the initial concentration of original HCl in flue gas is reacted with detection To exchange.
It is further preferred that the acquisition method of flue gas is isokinetic sampling's method.Gas production flow velocity is more than or less than sampled point flue gas Flow velocity all will lead to measurement error, and the present invention can be improved SO in detection flue gas using isokinetic sampling's method3Content precision.
It is further preferred that will be carried out after flue gas removing flying dust with salt when being reacted the flue gas after temperature control with salt Reaction；When detecting the initial concentration of original HCl in flue gas, the concentration of original HCl in flue gas will be detected after flue gas removing flying dust. The advantages of removing flying dust is: avoiding flying dust deposition blocking sampling exhaust gases passes, the presence of flying dust is avoided to influence the measurement essence of HCl Degree.
Preferably, the chloride is calcium chloride, potassium chloride, copper chloride, barium chloride or sodium chloride.
Preferably, the temperature of flue gas is controlled to 200 DEG C or more.
It is further preferred that the temperature of flue gas is controlled to 260 DEG C or more.
Preferably, the detection method of HCl is electrochemical process detection, on-line mass spectroscopy detection or infrared detection.
A kind of SO3The device of on-line checking, including smoke collecting component, smoke power component, temperature-controlled member, reacting part Part, control unit and HCl detection part, the smoke collecting component, reaction part and HCl detection part are sequentially connected, described Reaction part is blank component and salt absorption piece in parallel, and the smoke power component makes the smoke collecting component acquisition cigarette Gas, and the smoke power component can provide power, the flue gas of the temperature-controlled member control acquisition to acquire the conveying of flue gas Temperature, flue gas is delivered to the temperature of salt absorption piece process and the temperature of salt absorption piece is above SO3Adiabatic condensation temperature, it is described Villaumite is held in salt absorption piece, the control unit control flue gas flows through blank component or salt absorption piece.
A kind of SO3The device of on-line checking, including salt absorb branch, blank branch, smoke power component, temperature-controlled member, Control unit and HCl detection part, the salt absorb branch and connect with HCl detection part, and the blank branch and salt absorb branch Road is in parallel, and it includes the first smoke collecting component and salt absorption piece that the salt, which absorbs branch, and the first smoke collecting component is adopted The flue gas of collection enters HCl detection part through salt absorption piece, and the blank branch includes the second smoke collecting component and gutter Part, the second smoke collecting component enter HCl detection part through blank component, and the smoke power component adopts the flue gas Collect component and acquire flue gas, and the smoke power component can provide power, the temperature-controlled member control to acquire the conveying of flue gas The temperature of the flue gas of system acquisition, flue gas is delivered to the temperature of salt absorption piece process and the temperature of salt absorption piece is above SO3 Adiabatic condensation temperature, villaumite is held in the salt absorption piece, and the control unit control flue gas flows through blank component or salt absorption portion Part.
Wherein, temperature-controlled member can be supreme in SO to the branch circuit temperature-controlling where blank component3Adiabatic condensation temperature, can not also be right Branch where blank component carries out temperature control.
Preferably, the smoke collecting component, the first smoke collecting component, the second smoke collecting component be can be by cigarette Flue gas is delivered to the conduit component in apparatus of the present invention in road.Such as sampling head, sampling pipe etc..
Preferably, the smoke power component is the power that gas in flue gas in flue can be sucked into apparatus of the present invention Component.Such as sampling pump or aspiration pump of controllable gas flow for can control gas flow etc..
Preferably, the temperature-controlled member be according to the temperature of detection control heating device by temperature control to set temperature with On.
It is further preferred that the set temperature is 200 DEG C.
It is further preferred that the set temperature is 260 DEG C.
Wherein, the blank component is the component for not holding villaumite.As do not held the salt absorption piece of villaumite, not having It holds the connecting tube of villaumite or does not hold the container etc. of villaumite.
Preferably, the control unit is switch block or triple valve.
It is further preferred that the valve member includes switch A and switch B, switch A is arranged in where salt absorption piece Branch road, switch B are arranged on the branch road where blank component.
Preferably, salt in filter element or the reaction part is equipped between smoke collecting component and reaction part to inhale Branch road is equipped with filter element where the upstream of receiving apparatus and the blank component.
Preferably, the first filter element is set between the first smoke collecting component and salt absorption piece；The blank The second filter element is arranged in the downstream of second smoke collecting component of branch road.
Wherein, filter element, the first filter element and the second filter element can remove the flying dust in flue gas.
It is further preferred that the material that the filter core of the filter element uses is sintering metal, ceramics, silica wool or fibre Dimension.
Preferably, the smoke collecting component is connected with salt absorption piece by connecting tube, and the temperature-controlled member control connects The temperature of adapter tube is higher than SO3Adiabatic condensation temperature；The blank component is the second connecting tube.
It is further preferred that the salt absorption piece is removably mounted in connecting tube.
It is further preferred that the salt absorption piece is the hollow tubular device that two sides are reticular structure.
Preferably, the smoke collecting component is carbon steel pipe, stainless steel tube, polyfluortetraethylene pipe or fluorine sebific duct.
Preferably, the air inlet diameter of the smoke collecting component is 2mm-16mm.
Preferably, the smoke power component is mounted on after HCl detection part.
Preferably, the HCl detection part is electrochemical detection device, on-line mass spectroscopy detection device or infrared detection dress It sets.
The invention has the benefit that
1. of the invention by flue gas to SO3On adiabatic condensation temperature, SO is avoided3Condensation, later with chloride to SO3It carries out Absorbing reaction generates hydrogen chloride, avoids SO in control condensation method and isopropanol absorption process3It is endless in the condensation and absorption of tube wall Cause to measure inaccurate drawback entirely.
2. the present invention extracts flue gas by the way of isokinetic sampling, then by flue gas to SO3On adiabatic condensation temperature, keep away Exempt from SO3Condensation, by filter device remove flue gas in flying dust, later with chloride to SO3It carries out absorbing reaction and generates chlorination The content analysis of hydrogen, the hydrogen chloride generated finally by detection reaction obtains SO3Content, have it is easy to operate, precision is high, people For the small advantage of operating error, application prospect is boundless.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention 1；
Fig. 2 is the structural schematic diagram of salt absorption plant；
Fig. 3 is the structural schematic diagram of the embodiment of the present invention 6；
Wherein, 1. sampling head, 2. connecting tubes, 3. heating devices, 4. filter devices, 5. valve A, 6. valve B, 7. salt absorb Device, 8. temperature control devices, 9. bridge pieces, 10. hydrogen chloride detection devices, 11. sampling pumps, 12. second connecting tubes, 13. tubulars Device, 14. reticular structures, 15. hooks, 16. second sampling heads, 17. second filter devices.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the invention will be further described.
Embodiment 1
As shown in Figure 1, a kind of SO3The device of on-line checking, including sampling head 1, connecting tube 2, heating device 3, filtering dress 4, valve A5, valve B6, salt absorption plant 7, temperature control device 8, hydrogen chloride detection device 10 and sampling pump 11 are set, sampling head 1 connects It connects in one end of connecting tube 2, for carrying out isokinetic sampling to flue gas, the setting of heating device 3 is in 2 outside of connecting tube, for cigarette Gas is heated, and filter device 4 is set to the front of connecting tube 2, and for removing the flying dust in flue gas, salt absorption plant 7 is arranged In the rear portion of connecting tube 2, for absorbing the SO in flue gas3, the other end of connecting tube 2 passes through bridge piece 9 and hydrogen chloride detects Device 10 connects, and the bridge piece 9 is equipped with valve B6, and hydrogen chloride detection device 10 is used to detect the content of hydrogen chloride, temperature Control device 8 is located at heating device end, and for being adjusted and controlling to heating temperature, sampling pump 11 is located at hydrogen chloride detection dress Downstream is set, for controlling sampling flow.
Second connecting tube 12 is set after filter device 4, and the second connecting tube 12 is in parallel with salt absorption plant 7, the second connecting tube 12 import is arranged in the connecting tube 2 between filter device 4 and salt absorption plant 7, and the second connecting tube 12 is equipped with valve A5,12 rear end of the second connecting tube are connected to hydrogen chloride detection device 10.
1 diameter of sampling head is 7mm (flue gas flow rate 15m/s).
Connecting tube 2 is carbon steel pipe.
Filter device 4 is the filter core of sintering metal.Filter core is Round Porous column structure, and filter core can match just with connecting tube 2 It closes.
As shown in Fig. 2, salt absorption plant 7 is the hollow tubular device 13 that two sides are reticular structure 14, tubular device 13 Can cooperate just with connecting tube 2, sealing ring is equipped on the drum outer wall of salt absorption plant 7, and the outer diameter of sealing ring is slightly larger than Bore is connected, be mounted on salt absorption plant 7 can in connecting tube 2 just, while guaranteeing salt absorption plant 7 and connecting tube 2 Seamless installation, the side reticular structure 14 of tubular device 13 is equipped with hook 15, salt absorption plant 7 easy to disassemble and install.
Salt in salt absorption plant 7 is sodium chloride.
Hydrogen chloride detection device 10 is electrochemical detection device.
(simulated flue gas, simulated flue gas temperature are 300 DEG C to flue gas, SO in simulated flue gas3Content be 12.0ppm) with constant speed By sampling head 1, into connecting tube 2, (sampling head 1 should be put into a period of time in flue gas to the mode of sampling, it is ensured that itself and flue-gas temperature Just start to sample after identical), connecting tube 2 arranges that heating device 3, to 240 DEG C, avoids SO to flue gas outside3Condensation；Then The flying dust in flue gas is removed by filter device 4, flue gas is divided into two-way later, can switch over by valve, pass through valve all the way Door A5 (valve B6 is closed at this time), is directly entered electrochemical detection device by the second connecting tube 12, measures HCl in raw flue gas Initial concentration, another way enters salt absorption plant 7 (valve B6 is opened at this time, and valve A5 is closed), after detection reaction in flue gas Concentration (its principle are as follows: the SO in flue gas of hydrogen chloride3It is reacted with villaumite and generates sulfate, while generating hydrogen chloride, then flue gas Into electrochemical detection device), the difference of hydrogen cloride concentration is that reaction generates the concentration of hydrogen chloride and is in two-way flue gas SO in flue gas is calculated in 23.7ppm3Content be 11.85ppm, sampled 11 discharge of pump of last flue gas.
Embodiment 2
The present embodiment is same as Example 1, the difference is that:
1 diameter of sampling head is 12mm (flue gas flow rate 5m/s).
Connecting tube 2 is stainless steel tube.
Filter device 4 is the filter core of ceramics.
Salt in salt absorption plant 7 is potassium chloride.
Hydrogen chloride detection device 10 is infrared detecting device.
Arrange heating device 3 to flue gas to 260 DEG C outside connecting tube 2.
Flue gas uses SO3Content is the simulated flue gas of 70.1ppm.
Detecting obtained reaction and generating the concentration of hydrogen chloride is 134.7ppm, obtains SO in flue gas3Concentration be 67.35ppm。
Embodiment 3
The present embodiment is same as Example 1, the difference is that:
1 diameter of sampling head is 9mm (flue gas flow rate 10m/s).
Connecting tube 2 is polyfluortetraethylene pipe.
Filter device 4 is the filter core of silica wool.
Salt in salt absorption plant 7 is copper chloride.
Hydrogen chloride detection device 10 is on-line mass spectroscopy detection device.
Arrange heating device 3 to flue gas to 300 DEG C outside connecting tube 2.
Flue gas uses SO3Content is the simulated flue gas of 12.3ppm.
Detecting obtained reaction and generating the concentration of hydrogen chloride is 25.3ppm, obtains SO in flue gas3Content be 12.65ppm。
Embodiment 4
The present embodiment is same as Example 1, the difference is that:
1 diameter of sampling head is 8mm (flue gas flow rate 12m/s).
Connecting tube 2 is fluorine sebific duct.
Filter device 4 is the filter core of fiber.
Salt in salt absorption plant 7 is the mixture of calcium chloride and potassium chloride.
Arrange heating device 3 to flue gas to 400 DEG C outside connecting tube 2.
Flue gas uses SO3Content is the simulated flue gas of 30.6ppm.
Detecting obtained reaction and generating the concentration of hydrogen chloride is 62.4ppm, obtains SO in flue gas3Content be 31.2ppm.
Embodiment 5
The present embodiment is same as Example 1, the difference is that:
1 diameter of sampling head is 6mm (flue gas flow rate 15m/s),
Connecting tube 2 is polyfluortetraethylene pipe.
Filter device 4 is the filter core of ceramics.
Salt in salt absorption plant 7 is the mixture of barium chloride and sodium chloride.
Arrange heating device 3 to flue gas to 260 DEG C outside connecting tube 2.
Flue gas uses SO3Content is the simulated flue gas of 7.2ppm.
Detecting obtained reaction and generating the concentration of hydrogen chloride is 15.0ppm, obtains SO in flue gas3Content be 7.5ppm.
Embodiment 6
The present embodiment is same as Example 1, the difference is that: as shown in figure 3, the import connection the of the second connecting tube 12 Two sampling heads 16, the second connecting tube is interior to be equipped with the second filter device 17, the specification phase of the second filter device 17 and filter device 4 Together.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not to invention protection scope Limitation, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not required to It is still within the scope of the present invention to make the creative labor the various modifications or changes that can be made.

Claims (1)

1. SO in a kind of coal-fired flue-gas3The method of on-line checking, characterized in that the device of use includes sampling head, the first connection Pipe, heating device, filter device, valve A, valve B, salt absorption plant, temperature control device, hydrogen chloride detection device and sampling pump, Sampling head is connected to one end of the first connecting tube, and for carrying out isokinetic sampling to flue gas, heating device is arranged in the first connecting tube Outside, for heating to flue gas, filter device is set to the front of the first connecting tube, for removing the flying dust in flue gas, Salt absorption plant is set to the rear portion of the first connecting tube, for absorbing the SO in flue gas3, the other end of the first connecting tube passes through company It connects bend pipe to connect with hydrogen chloride detection device, the bridge piece is equipped with valve, and hydrogen chloride detection device is for detecting chlorination The content of hydrogen, temperature control device is located at heating device end, and for being adjusted and controlling to heating temperature, sampling pump is located at chlorination Hydrogen detection device downstream, for controlling sampling flow；
Second connecting tube is set after filter device, and the second connecting tube is in parallel with salt absorption plant, the import setting of the second connecting tube In the first connecting tube between filter device and salt absorption plant, the second connecting tube is equipped with valve A, the second connecting tube rear end It is connected to hydrogen chloride detection device；
Filter device is filter core, and filter core is Round Porous column structure, and filter core can cooperate just with the first connecting tube；
Salt absorption plant is the hollow tubular device that two sides are reticular structure, and tubular device can match just with the first connecting tube It closes, sealing ring is equipped on the drum outer wall of salt absorption plant, and the outer diameter of sealing ring inhales salt slightly larger than the first connection bore Receiving apparatus can be mounted in the first connecting tube just, while guarantee the seamless installation of salt absorption plant and the first connecting tube, cylinder The side reticular structure of shape device is equipped with hook, salt absorption plant easy to disassemble and install；
Flue gas enters the first connecting tube by sampling head in a manner of isokinetic sampling, and sampling head should be put into a period of time in flue gas, Ensure just to start to sample after it is identical as flue-gas temperature, arranges that heating device to flue gas, avoids SO outside the first connecting tube3's Condensation；The flying dust being then act through in filter device removal flue gas, flue gas is divided into two-way later, can be switched over by valve, one Road is closed by valve A, valve B, is directly entered hydrogen chloride detection device by the second connecting tube, measures HCl in raw flue gas Initial concentration, another way enter salt absorption plant, and valve B is opened at this time, and valve A is closed, hydrogen chloride in flue gas after detection reaction Concentration, the difference of hydrogen cloride concentration is the concentration that reaction generates hydrogen chloride in two-way flue gas, according to the concentration calculation of hydrogen chloride SO3Content；
When sampling head diameter is 7mm, and flue gas flow rate is 15m/s；
First connecting tube is carbon steel pipe；
Filter device is the filter core of sintering metal；
Salt in salt absorption plant is sodium chloride；
Hydrogen chloride detection device is electrochemical detection device；
Heating device is to flue gas to 240 DEG C；
When sampling head diameter is 12mm, and flue gas flow rate is 5m/s；
First connecting tube is stainless steel tube；
Filter device is the filter core of ceramics；
Salt in salt absorption plant is potassium chloride；
Hydrogen chloride detection device is infrared detecting device；
Heating device is to flue gas to 260 DEG C；
When sampling head diameter is 9mm, and flue gas flow rate is 10m/s；
First connecting tube is polyfluortetraethylene pipe；
Filter device is the filter core of silica wool；
Salt in salt absorption plant is copper chloride；
Hydrogen chloride detection device is on-line mass spectroscopy detection device；
Heating device is to flue gas to 300 DEG C；
When sampling head diameter is 8mm, and flue gas flow rate is 12m/s；
First connecting tube is fluorine sebific duct；
Filter device is the filter core of fiber；
Salt in salt absorption plant is the mixture of calcium chloride and potassium chloride；
Hydrogen chloride detection device is electrochemical detection device；
Heating device is to flue gas to 400 DEG C；
When sampling head diameter is 6mm, and flue gas flow rate is 15m/s；
First connecting tube is polyfluortetraethylene pipe；
Filter device is the filter core of ceramics；
Salt in salt absorption plant is the mixture of barium chloride and sodium chloride；
Hydrogen chloride detection device is electrochemical detection device；
Heating device is to flue gas to 260 DEG C.
CN201610804569.2A 2016-09-06 2016-09-06 A kind of SO3The method of on-line checking Active CN106289884B (en)

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