CN108872124A - A kind of online carbonyl analyzer and Burning Control System of Heating Furnace - Google Patents
A kind of online carbonyl analyzer and Burning Control System of Heating Furnace Download PDFInfo
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- CN108872124A CN108872124A CN201710182095.7A CN201710182095A CN108872124A CN 108872124 A CN108872124 A CN 108872124A CN 201710182095 A CN201710182095 A CN 201710182095A CN 108872124 A CN108872124 A CN 108872124A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 65
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 title claims abstract description 57
- 239000007789 gas Substances 0.000 claims abstract description 94
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 59
- 239000003546 flue gas Substances 0.000 claims abstract description 39
- 238000001914 filtration Methods 0.000 claims abstract description 31
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 238000010926 purge Methods 0.000 claims abstract description 20
- 230000002000 scavenging effect Effects 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 41
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 31
- 239000001301 oxygen Substances 0.000 claims description 26
- 229910052760 oxygen Inorganic materials 0.000 claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 25
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 20
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 17
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 17
- 210000004907 gland Anatomy 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 239000000741 silica gel Substances 0.000 claims description 13
- 229910002027 silica gel Inorganic materials 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 8
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 238000004880 explosion Methods 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 229920002449 FKM Polymers 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims description 2
- 230000008676 import Effects 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 229960001866 silicon dioxide Drugs 0.000 claims 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims 2
- 229910052791 calcium Inorganic materials 0.000 claims 2
- 239000011575 calcium Substances 0.000 claims 2
- 238000003682 fluorination reaction Methods 0.000 claims 2
- 241000233855 Orchidaceae Species 0.000 claims 1
- 235000019504 cigarettes Nutrition 0.000 claims 1
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000004458 analytical method Methods 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000005070 sampling Methods 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000004313 potentiometry Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/02—Furnaces of a kind not covered by any preceding group specially designed for laboratory use
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
- F27D2019/0012—Monitoring the composition of the atmosphere or of one of their components
- F27D2019/0015—Monitoring the composition of the exhaust gases or of one of its components
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0031—Regulation through control of the flow of the exhaust gases
-
- 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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Pathology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Clinical Laboratory Science (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a kind of online carbonyl analyzers, including transmitting unit, receiving unit, purge unit and control unit；Transmitting unit includes infrared laser light source and chopper, and receiving unit is mounted on heating furnace chimney two sides by flange including filtering gas cell, optical filter, convex lens and detector, transmitting unit and receiving unit；On the same line, light transmissive wafer is arranged in transmitting unit optical line terminal to the optical path of transmitting unit and receiving unit, and light transmissive wafer is arranged in receiving unit optical path starting point；Purge unit setting scavenging pipeline and positive pressure pipeline, scavenging pipeline are separately connected between transmitting unit and the light transmissive wafer and flange of receiving unit, and positive pressure pipeline is separately connected transmitting unit and receiving unit；Control unit is separately connected by connecting cable and transmitting unit and receiving unit.The online carbonyl analyzer can be run steadily in the long term, can improve the thermal efficiency by carbonomonoxide concentration in monitoring flue gas for heating furnace and safe handling provides data and supports.
Description
Technical field
The present invention relates to petrochemical industry flue gas analysis field, in particular to an oxygen in flue gas of heating furnace in a kind of petrochemical industry
Change the carbonyl analyzer and Burning Control System of Heating Furnace of the online the real time measure of concentration of carbon.
Background technique
With the pay attention to day by day to energy-saving and emission-reduction, heating furnace management is constantly reinforced in petrochemical industry, at present furnace operation
Horizontal and energy-saving and emission-reduction level has greatly improved in the past relatively, but there are also rooms for promotion for heating furnace optimization operation.Pass through
The measurement that on-line analysis, especially carbonomonoxide concentration are carried out to the flue gas of heating furnace, can show that the burning of heating furnace
State, and then heating furnace operating parameters are adjusted, heating furnace can be made to operate at optimum state, to realize reheating furnace energy-saving, subtract
Row and safe handling.
Mainly there are infrared analysis, potentiometry and gas chromatography etc. to the analysis method of carbonomonoxide concentration now,
Middle realization mainly uses infrared analysis to flue gas inspection.Traditional non-dispersive infrared detector uses two infrared light supplies, infrared
Light respectively enters reference gas chamber and measurement gas chamber after ovennodulation, is changed by the intensity of light source and calculates gas concentration.This method lacks
Point is to use two cost of light source height, and the infrared light that two light sources issue can have difference, and work long hours the intensity of light source
Variation tendency difference will lead to measurement sensitivity reduction.
Existing carbonyl analyzer mainly passes through sampling pipe when being measured, and a small amount of flue gas is acquired from flue gas,
It is imported into the measurement gas chamber of instrument internal and is measured by air pump, since gas will just can enter for a period of time in the duct
Instrument, state when measurement result is sampling, is not the result of the real time measure.Since furnace flue is larger, adopted from a certain
Sampling point, which acquires a small amount of sample, cannot represent carbonomonoxide concentration in entire flue gas, this method there are measurement results cannot complete generation
Carbonomonoxide concentration situation in table flue.Meanwhile for the Real Time Monitoring of flue gas, due to flue gas is large-minded, in flue gas
Containing impurity such as dust, need to continuously run for a long time in outdoor, general analysis instrument is unable to complete.
Summary of the invention
The purpose of the present invention is to overcome the shortcomings of the existing technology, provides a kind of reliable, quick and real-time Accurate Determining and adds
The analyzer of carbonomonoxide concentration in heating furnace flue, the online carbonyl analyzer can run steadily in the long term, can pass through
Carbonomonoxide concentration improves the thermal efficiency for heating furnace in monitoring flue gas and safe handling provides data and supports.
Online carbonyl analyzer of the invention, including transmitting unit, receiving unit, purge unit and control unit；
Wherein transmitting unit includes infrared laser light source and chopper, and receiving unit includes filtering gas cell, optical filter, convex lens and spy
Survey device, transmitting unit and receiving unit are mounted on heating furnace chimney two sides by flange；The optical path of transmitting unit and receiving unit
On the same line, transmitting unit optical line terminal setting light transmissive wafer is sealed, and light transmission is arranged in receiving unit optical path starting point
Chip is sealed；Scavenging pipeline and positive pressure pipeline is arranged in purge unit, and scavenging pipeline is separately connected transmitting unit and receives single
Between the light transmissive wafer and flange of member, positive pressure pipeline is separately connected transmitting unit and receiving unit；Control unit passes through connection electricity
Cable is separately connected with transmitting unit and receiving unit.
The infrared laser light source uses quantum cascade laser.The light transmissive wafer, optical filter and convex lens
Material is all made of in middle infrared band（Wave band near 4.65 microns）The good monocrystal calcium fluoride material of light transmission.
The filtering gas cell, including gas cell gland screw, gland, silica gel pad, calcium fluoride windows, sealing ring,
Pond body, separates crossbeam, nitrogen gas pond and CO gas pond at inlet seal screw；Filtering gas cell pond body is cylinder knot
Structure is divided axially into two parts along cylinder by separating crossbeam, and side is nitrogen gas pond, and the other side is CO gas pond；
The axial ends in nitrogen gas pond and CO gas pond is equipped with o-ring groove, and sealing ring is placed in o-ring groove,
Calcium fluoride windows are placed on sealing ring, and silica gel pad is placed on calcium fluoride windows, and silica gel pad corresponds to the portion inside gas cell
Divide and use hollow design, gland, silica gel pad and calcium fluoride windows are mounted in gas cell pond body by gland screw；Nitrogen
The side wall centers in gas cell and CO gas pond are equipped with air inlet, and nitrogen gas pond and CO gas pond charge phase
Air inlet is sealed using inlet seal screw and sealing ring after answering gas.
For the filtering gas cell pond body using aluminum alloy materials light-weight and with high hardness, the material internal structure is tight
It is close, it cannot be with the presence of any small stomata.
The calcium fluoride windows of the filtering gas cell are used in middle infrared band（Wave band near 4.65 microns）Light transmission is good
Good monocrystal calcium fluoride crystal.
The sealing ring is all made of high temperature resistant and the excellent O-shaped viton seal ring of sealing performance.
Axial one end of the filtering gas cell is encased in ball bearing, and the other end needs to load onto skin motor-driven
Band enables with filtering gas cell fast free along axis rotation, and gas cell can be with 4~12 revolutions per seconds of revolving speed quick rotation.
The infrared laser spot diameter of the infrared laser light source transmitting is about three points of the most narrow width of each gas cell
One of, in gas cell rotation process, infrared laser hot spot once can only be by a gas cell, and infrared laser hot spot is constantly
Pass through in turn in two gas cells.
The purge unit uses instrument wind, through inflow-rate of water turbine and pressure setting by just to transmitting unit and connecing in pipeline
It receives and is purged inside unit, its internal pressure is made to reach design requirement（100Pa）, internal pressure shape is indicated by pressure difference switch
State, and control the operating condition of instrument；It is purged, is prevented with clean gas between light transmissive wafer and interface flange by scavenging pipeline
Only light transmissive wafer pollutes.
Present invention simultaneously provides a kind of installation methods of online carbonyl analyzer, including following content：
（1）It is punched in the chimney radially opposite sides of cylinder-shaped tubular heater, punching diameter is greater than 100mm, two sides welding online one
Carbon analyzer mounting flange is aoxidized, transmitting unit and receiving unit are passed through into flange respectively and are mounted on chimney；
（2）By adjusting the laser angle emitted from light source, the infrared laser light letter for receiving high-speed photodetector
It is number most strong；
（3）The positive pressure pipeline and scavenging pipeline of transmitting unit and receiving unit are connected in purge unit, connected for purge unit
Pressure-air is connect, air pressure inside transmitting unit and receiving unit is made to be higher than external pressure 200Pa or more, preferably 200Pa ~
1000Pa meets requirement of explosion proof；
（4）Transmitting unit and receiving unit are connected to by signal cable and are mounted in the indoor control unit of control, control
Real-time display, which goes out, on unit measures accurate carbonomonoxide concentration in flue gas of heating furnace.
Present invention simultaneously provides a kind of Burning Control System of Heating Furnace, including above-mentioned online carbonyl analyzer, oxygen
Sensor, heating furnace and heater control system（DCS）；The heating furnace is from top to bottom followed successively by flue, damper, right
Flow chamber, radiation chamber and damper；Online carbonyl analyzer, oxygen sensor and heater control system（DCS）Mutually
Connection, online carbonyl analyzer are mounted on furnace flue, and oxygen sensor is mounted on the top of heating furnace convection cell,
Carbon monoxide content and oxygen content are monitored respectively；Heater control system（DCS）With oxygen sensor, damper and air door
Baffle interconnects, real-time monitoring inside heating furnace oxygen content, heater control system（DCS）Damper is monitored and controlled
With the state of damper.
The online carbonyl analyzer sends control signal according to carbon monoxide and oxygen content and gives heating furnace control
System processed（DCS）, then heater control system adjusts the aperture of damper and damper.
When the online carbonyl analyzer monitors that carbon monoxide or oxygen occur abnormal, which is automatically exited from
To Heating Furnace Control, restore air excess combustion state, it is ensured that heating furnace safe operation.
The online carbonyl analyzer can still pass through tune in the state that heating furnace is bad because of sealing performance
Damper aperture is saved, makes heating furnace work in optimum state.
The online carbonyl analyzer automatic running is not required to staff's operation, when working condition occurs abnormal
Issue sound-light alarm.
Carbon monoxide needs chronically to continuously run in outdoor in on-line determination flue gas of heating furnace, and gas is fast in flue
Speed flowing, large-minded, temperature is high, and a small amount of impurity or dust, existing room stringent to sensing equipment requirement of explosion proof are contained in flue gas
Interior analysis instrument cannot work with this condition, can not in Accurate Determining flue gas carbon monoxide concentration.
The present invention meets requirement of explosion proof using instrument internal barotropic gas purging and internal structure design and scene is harsh
Operating condition, the present invention is using highly reliable and high-power quantum cascade laser as infrared light supply, and performance is stablized, major diameter
Infrared light by furnace flue, sampling quantity is big, and measurement accuracy is high, accuracy is good, performance is stable, high sensitivity, representativeness
The advantages that strong and finding speed is fast, and be not required to the processing such as be dusted flue gas and be dehydrated.The present invention directly measures heating furnace
Radially the carbon monoxide in all flue gases, the volume of the flue gas of measurement are bigger for chimney；Determination of carbon monoxide result of the invention
It is not influenced by the intensity of light source and external vibration, improves carbonyl analyzer to the measurement sensitivity of light concentration gas and accurate
Degree；Gas cell in analyzer of the present invention is compact-sized, light-weight and stable and reliable for performance, can longtime running, be not in
Leakage phenomenon；The window of gas cell uses monocrystal calcium fluoride material, has many advantages, such as that hardness is high, it is cheap to be not easy burn into；Gas
Body pond is easy to operate, and inflation and installation are very easy to, and are facilitated and detected internal gas state using infrared spectrometer.The present invention point
Analyzer is structurally reasonable, automatic running, and real-time monitoring heating furnace combustion state provides for reheating furnace energy-saving, emission reduction and safe operation
Foundation.
Burning Control System of Heating Furnace of the invention has the following advantages that：（1）The present invention directly monitors an oxidation in flue gas
Carbon and oxygen content make heating furnace safe handling；（2）Burning Control System of Heating Furnace can be by the oxidation in flue gas of heating furnace
Carbon content control makes the oxygen content in flue gas be in 0.5~0.9%, burning is in completely burned and not in 100~150ppm
The critical point of completely burned, it is ensured that flue gas loss is minimum, and the production quantity of nitrogen oxides is minimum；（3）Improve thermal efficiency of heating furnace 0.6
~1.0%, nitrogen oxides emission reduction 25~45%.
Detailed description of the invention
Fig. 1 is the light path schematic diagram of online carbonyl analyzer of the invention.
Fig. 2 is the structural schematic diagram of online carbonyl analyzer of the invention.
Fig. 3 is online carbonyl analyzer filtering gas cell structural schematic diagram of the invention.
Fig. 4 is online carbonyl analyzer filtering gas cell sectional view of the invention.
Fig. 5 is online carbonyl analyzer filtering gas cell gland structure schematic diagram of the invention.
Fig. 6 is online carbonyl analyzer operation result of the invention.
Fig. 7 is carbonyl analyzer operation result in laboratory in comparative example.
Fig. 8 is Burning Control System of Heating Furnace of the invention.
Wherein, 1- infrared laser light source, 2- chopper, 3- heating furnace chimney, 4- filtering gas cell, 5- optical filter, 6- are convex
Lens, 7- detector, 8- infrared light path, 9- light transmissive wafer, 10- connecting flange, 11 be pressure difference switch, 12- transmitting unit, 13-
Receiving unit, 14- control unit, 15- connecting cable, 16- purge unit, 17- instrument wind inlet, 18- scavenging pipeline, 19- is just
Pressure pipe road；
4-1 is gland screw, and 4-2 is gland, and 4-3 is silica gel pad, and 4-4 is calcium fluoride windows, and 4-5 is gland screw hole, 4-6
It is sealing ring, 4-7 pond body, 4-8 inlet seal screw, 4-9 separation crossbeam, 4-10 belt pulley installation position, 4-11 is nitrogen gas
Pond, 4-12 are CO gas ponds, and 4-13 is bearing installation position, and 4-14 is infrared laser hot spot；
The online carbonyl analyzer controller of 20-, 21- heater control system（DCS）, 22- flue, the online oxidation of 23-
Carbon analyzer, 24- damper, 25- oxygen sensor, 26- convection cell, 27- radiation chamber, 28- heating furnace, 29- damper.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings, and embodiments of the present invention are not limited thereto.
The specific structure of the online carbonyl analyzer of the present invention is as depicted in figs. 1 and 2.Online carbonyl analyzer light
Road includes infrared laser light source 1, chopper 2, furnace flue 3, filtering gas cell 4, optical filter 5, convex lens 6 and detector 7；
Measuring mid-infrared laser is continuously emitted from infrared light supply 1, in the continuous infrared light after high-speed rotating chopper 2
It is modulated into pulsed light by way of according to-chopping off-, then passes through the flue gas in heating furnace chimney 3, infrared luminous intensity
The remitted its fury after carbon monoxide in flue gas absorbs, the degree of decrease is directly related with carbonomonoxide concentration, and then circulation is logical
Cross two parts of filtering gas cell 4（That is high pure nitrogen gas cell and CO gas pond）Optically and electrically noise is filtered out,
Then infrared light allows the infrared light of carbon monoxide absorption band near 4.65 microns by narrow bandpass filters 5, narrow bandpass filters 5
It can pass through, the infrared light of other bands of a spectrum ranges is blocked, to improve the sensitivity that detector 7 changes carbonomonoxide concentration,
Last infrared light focuses on the photosurface of detector 7 after the focusing of convex lens 6, will be loaded with the light of carbonomonoxide concentration variation
Signal is converted into electric signal.
The course of work of online carbonyl analyzer of the invention is as follows：
1, transmitting unit 12：Infrared light supply 1 continuously launches mid-infrared laser, using continuous after high-speed rotating chopper 2
Infrared light is modulated into pulsed light according to-chopping off-by way of, infrared then by the flue gas in heating furnace chimney 3
Luminous intensity remitted its fury after carbon monoxide in flue gas absorbs；
2, receiving unit 13：Filtering gas cell 4, optical filter 5, convex is passed sequentially through from heating furnace chimney 3 transmitted through the infrared light come
The optical path 8 of lens 6 and detector 7, optical path and transmitting unit 12 is on the same axis；
3, control unit 14：It is connected on transmitting unit 12 and receiving unit 13 by connecting cable 15, monitors infrared laser light
1 operating amperage of source, 2 revolution of chopper, filtering 4 revolution of gas cell and 7 output voltage signal intensity of detector, conversion filtering
The nitrogen gas pond of gas cell 4 and the laser intensity in CO gas pond, then calculate the carbonomonoxide concentration in flue gas,
The current signal output of measurement result can be exported, in real time in order to the monitoring and adjustment of heating furnace combustion state；
4, purge unit 16：Instrument wind is introduced from import 17, after adjusted pressure, purges light transmissive wafer 9 by scavenging pipeline 18
Surface reaches anti-pollution purpose, is that transmitting unit 12 and receiving unit 13 realize positive pressure purpose by positive pressure pipeline 19.
The specific structure of filtering gas cell of the invention is as shown in Fig. 3, Fig. 4 and Fig. 5.
Filtering gas cell of the invention, including gas cell gland screw 4-1, gland 4-2, silica gel pad 4-3, calcirm-fluoride window
Mouth 4-4, sealing ring 4-6, pond body 4-7, inlet seal screw 4-8, separate crossbeam 4-9, nitrogen gas pond 4-11 and carbon monoxide
Gas cell 4-12；Filtering gas cell pond body 4-7 is cylindrical structure, is divided axially into two parts along cylinder by separating crossbeam 4-9, one
Side is nitrogen gas pond 4-11, and the other side is CO gas pond 4-12；Nitrogen gas pond 4-11 and CO gas pond
The axial ends of 4-12 is equipped with o-ring groove, and sealing ring 4-6 is placed in o-ring groove, and calcium fluoride windows 4-4 is placed in close
On seal 4-6, silica gel pad 4-3 is placed on calcium fluoride windows 4-4, and the part that silica gel pad 4-3 corresponds to inside gas cell is adopted
With hollow design, gland 4-2, silica gel pad 4-3 and calcium fluoride windows 4-4 are mounted on by gas cell pond by gland screw 4-1
On body 4-7；The side wall centers of nitrogen gas pond 4-11 and CO gas pond 4-12 are equipped with air inlet, nitrogen gas pond 4-
11 and CO gas pond 4-12 uses inlet seal screw 4-8 and sealing ring 4-6 that air inlet is close after charging corresponding gas
Envelope.
When the filtering gas cell operates, the bearing installation position 4-13 of one end is assembled in ball bearing, in the other end
Belt pulley installation position 4-10 load onto driving belt motor-driven, driven by motor, make gas cell along its axle center with
4-12 revolutions per seconds of revolving speed quick rotation.
Both in nitrogen gas pond 4-11 inflation, the inlet seal screw 4-8 on the 4-11 of nitrogen gas pond is removed,
It is put into togerther in the glove box that atmosphere is nitrogen, thoroughly removes air in the 4-11 of nitrogen gas pond by vacuumizing mode, so
Make then to connect inlet seal screw 4-8 full of nitrogen inside the 4-11 of nitrogen gas pond under set temperature and air pressure conditions afterwards
It is packed into together with sealing ring on the air inlet of nitrogen gas pond 4-11, nitrogen gas pond 4-11 is fully sealed；Carbon monoxide gas
The inflation method of body pond 4-12 is identical with the inflation method of nitrogen gas pond 4-11, and nitrogen is only changed to carbon monoxide gas
Body.
Burning Control System of Heating Furnace of the invention is as shown in figure 8, including online carbonyl analyzer controller 20, adding
Hot stove control system（DCS）21, online carbonyl analyzer 23, oxygen sensor 25 and heating furnace 28；The heating furnace
28 include flue 22, damper 24, convection cell 26, radiation chamber 27, heating furnace 28 and damper 29；Online carbon monoxide point
Analyzer controller 20 by communication cable directly and heater control system（DCS）21, online carbonyl analyzer 23 and oxygen
Gas sensor 25 is connected, and online carbonyl analyzer 23 is mounted on the flue 22 of heating furnace 28, and is mounted on damper
24 top, the carbon monoxide content in online 23 the real time measure flue gas of carbonyl analyzer, oxygen sensor 25 are mounted on
The top of 28 convection cell 26 of heating furnace, oxygen content in the real time measure flue gas；Heater control system（DCS）With oxygen sensor
25, damper 24 and damper 29 interconnect, oxygen content in 9 flue gas of real-time monitoring heating furnace, heater control system
（DCS）20 are monitored and controlled the state of damper 24 and damper 29.When online carbonyl analyzer 23 and oxygen pass
When sensor 25 is detected into the air excess of heating furnace 28, that is, when being more than setting value, online carbonyl analyzer controller
20 send control signal to heater control system（DCS）21, the latter reduces 29 aperture of damper, while adjusting damper
24 apertures are in carbonomonoxide concentration and oxygen concentration in 28 flue gas of heating furnace in setting range；Add when detecting to enter
Then increase 29 aperture of damper when 28 oxygen deficiency of hot stove, and adjusts 24 aperture of damper.Online carbonyl analyzer
Controller 20 can automatically control heating furnace work under optimal combustion state, when detecting carbon monoxide and oxygen content exception
Heating Furnace Control is automatically exited from, air excess combustion state is restored to, realizes that heating furnace improves the thermal efficiency, reduces discharge and safety
The purpose of operation.
Embodiment
In two side perforating of chimney of cylinder-shaped tubular heater, online carbonyl analyzer mounting flange is welded, is punched
Diameter is greater than 100mm, and the axis of two flanges must be on the same straight line by chimney central point.By transmitting unit and receive single
Member is mounted on chimney by flange respectively.By adjusting the laser angle emitted from light source, make high-speed photodetector
The infrared laser optical signal received is most strong.
The positive pressure pipeline and scavenging pipeline of transmitting unit and receiving unit are connected in purge unit, connected for purge unit
Pressure-air is connect, so that the air pressure inside transmitting unit and receiving unit is higher than external pressure 200Pa or more, meets requirement of explosion proof.
Transmitting unit and receiving unit are connected to by signal cable and are mounted in the indoor control unit of control, control
Real-time display goes out to measure accurate carbonomonoxide concentration in flue gas of heating furnace on unit, and online carbon monoxide point is given in Fig. 6
Operation result of the analyzer on tubular heater can be reserved for the mistake that carbonomonoxide concentration changes over time on its connection computer
Journey, to analyze and research to heating furnace combustion state.
Comparative example
8mm diameter aperture is beaten in the chimney side of cylinder-shaped tubular heater, and welds 8mm stainless steel tube, chimney is goed deep into one end
400mm, the other end connect dedusting and dehydration device, after reconnecting gas pump, are connected to the indoor carbonyl analyzer of control
On, the gas measured is discharged to outdoor suitable position by exhaust pump and stainless steel pipes.Due to gas sampling amount is few and
A fixed position sampling, eudiometry result precision and representativeness be not high.
Carbonyl analyzer operation result in laboratory is as shown in fig. 7, it is 7.75% that it, which measures relative error, and this hair
The relative error of bright Fig. 6 is only 3.48%, and measurement result of the present invention is more accurate.
Flue gas will be by 100 meters or longer air delivering pipeline when carbonyl analyzer measures in laboratory, and instrument
Internal gas wants new and old exchange, needs 10 minutes or more time, so measurement result is the smoke behavior before 15 minutes,
Measurement result obviously lags；And the present invention is not required to sample, and directly measures the flue gas quickly through flue, the present invention only needs about 0.1
Second just obtains as a result, finding speed is significantly faster than carbonyl analyzer in laboratory.In addition, carbon monoxide is analyzed in laboratory
The dedusting of instrument and dehydration device need periodic maintenance, increase operation element amount, and tested flue gas will enter instrument internal, be easy
Optical element is constituted and is polluted, to influence the performance of instrument, problems are not present in the present invention.
Claims (14)
1. a kind of online carbonyl analyzer, it is characterised in that：Including transmitting unit, receiving unit, purge unit and control
Unit；Wherein transmitting unit includes infrared laser light source and chopper, and receiving unit includes filtering gas cell, optical filter, convex lens
Mirror and detector, transmitting unit and receiving unit are mounted on heating furnace chimney two sides by flange；Transmitting unit and receiving unit
Optical path on the same line, transmitting unit optical line terminal setting light transmissive wafer be sealed, receiving unit optical path starting point is set
Light transmissive wafer is set to be sealed；Purge unit is arranged scavenging pipeline and positive pressure pipeline, scavenging pipeline be separately connected transmitting unit and
Between the light transmissive wafer and flange of receiving unit, positive pressure pipeline is separately connected transmitting unit and receiving unit；Control unit passes through
Connecting cable is separately connected with transmitting unit and receiving unit.
2. online carbonyl analyzer described in accordance with the claim 1, it is characterised in that：The infrared laser light source uses
Quantum cascade laser.
3. online carbonyl analyzer described in accordance with the claim 1, it is characterised in that：The light transmissive wafer, optical filter
The good monocrystal calcium fluoride material of the light transmission near middle infrared band is all made of with the material of convex lens.
4. online carbonyl analyzer described in accordance with the claim 1, it is characterised in that：Filtering gas cell includes gas cell pressure
Lid screw, silica gel pad, calcium fluoride windows, sealing ring, pond body, inlet seal screw, separates crossbeam, nitrogen gas pond at gland
With CO gas pond；Filtering gas cell pond body is cylindrical structure, is divided axially into two parts along cylinder by separating crossbeam, one
Side is nitrogen gas pond, and the other side is CO gas pond；The axial ends in nitrogen gas pond and CO gas pond is equal
Equipped with o-ring groove, sealing ring is placed in o-ring groove, and calcium fluoride windows are placed on sealing ring, and silica gel pad is placed in fluorination
On calcium window, the part that silica gel pad corresponds to inside gas cell uses hollow design, by gland screw by gland, silicagel pad
Piece and calcium fluoride windows are mounted in gas cell pond body；The side wall centers in nitrogen gas pond and CO gas pond be equipped with into
Port, nitrogen gas pond and CO gas pond use inlet seal screw and sealing ring by air inlet after charging corresponding gas
Sealing.
5. online carbonyl analyzer according to claim 4, it is characterised in that：The filtering gas cell pond body is adopted
With aluminum alloy materials light-weight and with high hardness.
6. online carbonyl analyzer according to claim 4, it is characterised in that：The fluorination of the filtering gas cell
Calcium window is used in 4.65 microns of good monocrystal calcium fluoride crystal of wave band light transmission nearby.
7. online carbonyl analyzer according to claim 4, it is characterised in that：The sealing ring is all made of resistance to height
The excellent O-shaped viton seal ring of mild sealing performance.
8. online carbonyl analyzer according to claim 4, it is characterised in that：The axial direction of the filtering gas cell
One end is encased in ball bearing, and the other end needs to load onto belt motor-driven, enables with filtering gas cell fast free
Along axis rotation, gas cell can be with 4~12 revolutions per seconds of revolving speed quick rotation.
9. online carbonyl analyzer described in accordance with the claim 1, it is characterised in that：The infrared laser light source transmitting
Infrared laser spot diameter be about the most narrow width of each gas cell one third, in gas cell rotation process, it is infrared swash
Light hot spot once can only constantly be passed through in turn in two gas cells by a gas cell, infrared laser hot spot.
10. online carbonyl analyzer described in accordance with the claim 1, it is characterised in that：The purge unit uses instrument
Table wind, through inflow-rate of water turbine and pressure setting by making inside it just in pipeline to being purged inside transmitting unit and receiving unit
Pressure reaches design requirement（100Pa）, internal pressure conditions are indicated by pressure difference switch, and control the operating condition of instrument；It is logical
It crosses scavenging pipeline to be purged between light transmissive wafer and interface flange with clean gas, prevents light transmissive wafer from polluting.
11. online carbonyl analyzer according to claim 4, it is characterised in that：It, will when nitrogen gas pond is inflated
Inlet seal screw on nitrogen gas pond removes, and the two is put into togerther in the glove box that atmosphere is nitrogen, by vacuumizing
Mode thoroughly removes the air in nitrogen gas pond, then makes to be full of inside nitrogen gas pond under set temperature and air pressure conditions
Then inlet seal screw is packed on the air inlet in nitrogen gas pond together with sealing ring, keeps nitrogen gas pond complete by nitrogen
It is hermetically sealed.
12. a kind of installation method of online carbonyl analyzer described in claim 1, it is characterised in that in following
Hold：（1）It is punched in the chimney radially opposite sides of cylinder-shaped tubular heater, online carbonyl analyzer Method for Installation is welded in two sides
Transmitting unit and receiving unit are passed through flange respectively and are mounted on chimney by orchid；（2）Swashed by what adjusting was emitted from light source
Angular, the infrared laser optical signal for receiving high-speed photodetector are most strong；（3）Just by transmitting unit and receiving unit
Pressure pipe road and scavenging pipeline are connected in purge unit, are connected pressure-air for purge unit, are made transmitting unit and receiving unit
Internal air pressure is higher than external pressure 200Pa or more, meets requirement of explosion proof；（4）By signal cable by transmitting unit and reception
Unit, which is connected to, to be mounted in the indoor control unit of control.
13. a kind of course of work of online carbonyl analyzer described in claim 1, it is characterised in that as follows：1, emit
Unit（12）：Infrared light supply（1）Continuously launch mid-infrared laser, using high-speed rotating chopper（2）It is continuous infrared afterwards
Light is modulated into pulsed light according to-chopping off-by way of, then passes through heating furnace chimney（3）In flue gas, infrared light
Intensity remitted its fury after carbon monoxide in flue gas absorbs；
2, receiving unit（13）：Filtering gas cell is passed sequentially through from heating furnace chimney 3 transmitted through the infrared light come（4）, optical filter
（5）, convex lens（6）And detector（7）, optical path and transmitting unit（12）Optical path（8）On the same axis；
3, control unit（14）：Pass through connecting cable（15）It is connected to transmitting unit（12）And receiving unit（13）On, it monitors red
Outer light source（1）Operating amperage, chopper（2）Revolution, filtering gas cell（4）Revolution and detector（7）Output voltage signal
Intensity, conversion filtering gas cell（4）Nitrogen gas pond and CO gas pond laser intensity, then calculate in flue gas
Carbonomonoxide concentration, can export in real time measurement result current signal output, in order to the monitoring of heating furnace combustion state
And adjustment；
4, purge unit（16）：Instrument wind is from import（17）It introduces, after adjusted pressure, passes through scavenging pipeline（18）Purge light transmission
Chip（9）Surface passes through positive pressure pipeline（19）For transmitting unit（12）And receiving unit（13）Realize positive pressure.
14. a kind of Burning Control System of Heating Furnace, including online carbon monoxide described in claim 1 ~ 11 any claim
Analyzer, oxygen sensor, heating furnace and heater control system（DCS）；The heating furnace be from top to bottom followed successively by flue,
Damper, convection cell, radiation chamber and damper；Online carbonyl analyzer, oxygen sensor and Heating Furnace Control system
System（DCS）It interconnects, online carbonyl analyzer is mounted on furnace flue, and oxygen sensor is mounted on heating furnace pair
The top of flow chamber monitors carbon monoxide content and oxygen content respectively；Heater control system（DCS）With oxygen sensor, cigarette
Road baffle and damper interconnect, real-time monitoring inside heating furnace oxygen content, heater control system（DCS）Monitoring and
Control the state of damper and damper.
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| CN201710182095.7A CN108872124B (en) | 2017-05-12 | 2017-05-12 | Online carbon monoxide analyzer and heating furnace combustion control system |
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| CN108872124B (en) | 2020-12-08 |
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