CN116381166A - VOCs on-line monitoring instrument - Google Patents
VOCs on-line monitoring instrument Download PDFInfo
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- CN116381166A CN116381166A CN202310657004.6A CN202310657004A CN116381166A CN 116381166 A CN116381166 A CN 116381166A CN 202310657004 A CN202310657004 A CN 202310657004A CN 116381166 A CN116381166 A CN 116381166A
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- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 20
- 238000012544 monitoring process Methods 0.000 title claims abstract description 18
- 238000004140 cleaning Methods 0.000 claims abstract description 110
- 239000007921 spray Substances 0.000 claims abstract description 83
- 239000001257 hydrogen Substances 0.000 claims abstract description 46
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 46
- 230000007246 mechanism Effects 0.000 claims abstract description 43
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 239000012159 carrier gas Substances 0.000 claims abstract description 21
- 239000003570 air Substances 0.000 claims abstract description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 43
- 238000007789 sealing Methods 0.000 claims description 26
- 239000000178 monomer Substances 0.000 claims description 25
- 238000007790 scraping Methods 0.000 claims description 16
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 150000002431 hydrogen Chemical class 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims 1
- 239000002912 waste gas Substances 0.000 abstract description 3
- 125000004435 hydrogen atom Chemical class [H]* 0.000 abstract 1
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 12
- 238000002485 combustion reaction Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000769 gas chromatography-flame ionisation detection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004452 microanalysis Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0047—Organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
- B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/62—Detectors specially adapted therefor
- G01N30/64—Electrical detectors
- G01N30/68—Flame ionisation detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
The invention relates to the field of waste gas detection, and discloses a VOCs on-line monitoring instrument which comprises a detection device, wherein the detection device comprises a mounting frame, an ion chamber in a cylindrical shape is mounted on the mounting frame, a spray pipe in lifting arrangement is coaxially arranged in the ion chamber, the upper end of the spray pipe is a spray nozzle in a conical shape, the detection device further comprises a pipeline group, a cleaning mechanism and a linear module, the pipeline group is used for dragging hydrogen, carrier gas and air to flow in the ion chamber, the linear module is used for dragging the spray pipe to perform lifting movement, the cleaning mechanism is arranged between a guiding state and a cleaning state for switching, when the detection device is in the guiding state, the cleaning mechanism is opened and used for guiding part of air to move and gather towards the axis of the spray pipe, when the detection device is in the cleaning state, the cleaning mechanism is folded and forms a closed cleaning area, the spray nozzle of the spray pipe is positioned in the cleaning area and is cleaned by the cleaning mechanism, and ash generated by cleaning is guided by the cleaning mechanism to be outwards output.
Description
Technical Field
The invention relates to the field of waste gas detection, in particular to an on-line monitoring instrument for VOCs.
Background
The gas chromatography-flame ionization detection method is one of the detection methods of VOCs, the hydrogen flame ionization detector used is a high-sensitivity detector, and is suitable for micro-analysis of organic matters, the organic matters are chemically ionized under the action of hydrogen flame to form ion flow, the detection is carried out by measuring the intensity of the ion flow, and the sensitivity influencing factors of the hydrogen flame ionization detector are as follows: for example, the smaller the inner diameter of the nozzle, the higher the sensitivity, but when not in use, the too small inner diameter easily causes the outside dust and the like to block the nozzle, and when in long-term use, the too small inner diameter easily causes ash to block the nozzle, so the nozzle needs to be cleaned regularly, and in the prior art, the nozzle is generally detached from the detector for cleaning, which is complicated, time-consuming and labor-consuming; for example, in the prior art, air generally enters the ion chamber from the side, and the entering mode includes an air pump, an air blower and the like, so that on one hand, the flow of the air fluctuates to influence flames, and on the other hand, the air enters the ion chamber from the side, which is equivalent to the air entering from one side of the flames, and the air is insufficient in contact with the flames to influence the combustion of the flames, so that the sensitivity of the detector is influenced.
Based on the above, the invention provides an online VOCs monitoring instrument.
Disclosure of Invention
In order to solve the problems mentioned in the background, the invention provides an on-line monitoring instrument for VOCs.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows.
The VOCs on-line monitoring instrument comprises a detection device, wherein the detection device comprises a mounting frame, an ion chamber in a cylindrical shape is mounted on the mounting frame, a spray pipe in lifting arrangement is coaxially arranged in the ion chamber, the upper end of the spray pipe is a spray nozzle, and the spray nozzle is in a conical shape;
the detection device also comprises a pipeline group, a cleaning mechanism and a linear module, wherein the pipeline group is used for dragging hydrogen, carrier gas and air to flow towards the ion chamber, and the linear module is used for dragging the spray pipe to perform lifting movement;
the cleaning mechanism is arranged between a guiding state and a cleaning state for switching, when the cleaning mechanism is in the guiding state, the cleaning mechanism is opened and used for guiding part of air to move towards the axis of the spray pipe to gather, when the cleaning mechanism is in the cleaning state, the cleaning mechanism is folded and forms a closed cleaning area, the nozzle of the spray pipe is positioned in the cleaning area and is cleaned by the cleaning mechanism, and ash generated by cleaning is guided by the cleaning mechanism to be output outwards.
Further, the cleaning mechanism comprises a fixed seat arranged at the lower opening of the ion chamber, the upper end surface of the fixed seat is provided with a mounting hole in a penetrating way, the lower end surface of the fixed seat is provided with an annular groove in an annular shape, the mounting hole, the annular groove and the ion chamber are coaxial, and the notch of the annular groove is provided with a ring cover;
the cleaning mechanism further comprises a fixing body, the fixing body comprises a fixing pipe coaxially and fixedly arranged in the mounting hole, an external step coaxially extends out of the fixing pipe and is fixedly attached to the upper end face of the fixing seat, a first middle hole is formed in the external step, a second middle hole used for realizing communication between the annular groove and the middle hole is formed in the upper end face of the fixing seat, an annular wall coaxially and upwardly extends from the outer circular face of the external step, and an annular seat in an annular shape is arranged at the upper end of the annular wall.
Further, a joint is arranged at the lower pipe orifice of the fixed pipe, the upper end of the spray pipe sequentially penetrates through the joint and the fixed pipe and then is positioned in the ion chamber, a gap a is formed between the outer wall of the spray pipe and the inner wall of the fixed pipe, and the gap a is communicated with the joint.
Further, the upper end face of the ring seat radially penetrates through the guide grooves, a plurality of guide grooves are formed in the circumferential direction of the ring seat, a group of cleaning monomers are installed in each guide groove, and a driving assembly for driving the cleaning monomers to move in the guide grooves is further arranged on the upper end face of the ring seat.
Further, the cleaning monomers comprise sliding blocks which are arranged in the guide grooves in a sliding manner, sealing blocks extend from the upper end faces of the sliding blocks, the surfaces of the sealing blocks facing the axial lead of the ring seat are in a cambered surface shape coaxial with the ring seat, when the sealing blocks in all the cleaning monomers are folded and mutually contacted, all the sealing blocks can be matched to seal the upper opening of the ring seat, and the cambered surface of all the sealing blocks are matched to form a cleaning area in a conical shape;
the cambered surface of the sealing block is also provided with a jack in a penetrating way along the radial direction, a scraping plate is inserted into the jack, and the surface of the scraping plate facing the axial line of the ring seat is in a cambered surface shape coaxial with the ring seat.
Further, one side of the scraping plate, which is away from the axial lead of the ring seat, is provided with an inclined plane III, and the distance between the inclined plane III and the axial lead of the ring seat is increased from bottom to top;
the upper end face of the sliding block is vertically upwards provided with a fixed rod, the upper end of the fixed rod is provided with a limiting ring, an upper pushing block is slidably arranged outside the fixed rod, a second spring positioned between the sliding block and the upper pushing block is sleeved outside the fixed rod, one side of the upper pushing block, facing the axial lead of the ring seat, of the upper pushing block is provided with a fourth inclined plane, the fourth inclined plane is parallel to the third inclined plane and is attached to the third inclined plane, and the second spring is in a compressed state in an initial state.
Further, the drive assembly includes the coaxial expansion ring that is located ring seat top, and the interior round surface of expansion ring extends has to push away the piece, pushes away in the piece slip inserts the guide slot, pushes away one side that the piece was towards ring seat axial lead and is provided with inclined plane one, and the distance between inclined plane one and the ring seat axial lead is decreasingly by down, and one side that the slider deviates from ring seat axial lead is provided with inclined plane two, and inclined plane two is parallel and both laminating each other with inclined plane one, and the top coaxial of expansion ring is provided with the annular slab, is provided with spring one between annular slab and the expansion ring.
Further, the linear module comprises a mounting seat which is arranged in a lifting manner, a second motor is mounted on the mounting seat, and an output shaft of the second motor is in a hollow shaft shape and is coaxially sleeved outside the spray pipe.
Further, the pipeline group comprises a hydrogen pipe, a gas carrying pipe, an air pipe and an ash discharging pipe, wherein the ash discharging pipe is communicated with the connector, and the air pipe is communicated with the annular groove;
the outer part of the spray pipe is provided with a fixed sleeve close to the lower pipe orifice of the spray pipe, and the outer circular surface of the spray pipe is provided with a connecting hole communicated with the inner cavity of the fixed sleeve;
the hydrogen pipe is communicated with the lower pipe orifice of the spray pipe, and the gas carrying pipe is communicated with the fixed sleeve.
Further, it further comprises air intake means for continuously supplying a fixed amount of air toward the detection means and the flow rate of the air can be adjusted.
Compared with the prior art, the invention has the beneficial effects that:
the cleaning mechanism in the invention is arranged between a guiding state and a cleaning state to switch:
1. when the detection device detects waste gas, the cleaning mechanism is in a guide state, at the moment, hydrogen enters the spray pipe through the hydrogen pipe and is discharged from the spray nozzle, the hydrogen is ignited by the igniter c, carrier gas enters the spray pipe through the carrier gas pipe and is discharged from the spray nozzle along with VOCs, and enters the burning hydrogen flame, meanwhile, air flows upwards after passing through the air pipe, the annular groove, the middle hole II, the middle hole I and the annular wall, in the flowing process, a part of air flows upwards along the gaps of the opened cleaning monomer, the part of air wraps the hydrogen flame, the other part of air contacts with the cambered surface of the sealing block, and is guided to gather at the outer circular surface of the spray pipe along the cambered surface, and then disperses to two sides and flows upwards through the gaps, and because the part of air is gathered close to the spray pipe, the part of air finally flows towards the flame core and inner flame of the hydrogen flame, namely, under the guide of the detection device, a part of air wraps the hydrogen flame, a part of air flows towards the core of the hydrogen flame, so that the hydrogen flame contacts with the air, and the burning of the hydrogen flame is more sufficient;
in the prior art, air enters from the side of the ion chamber, that is, the air enters from the side of the hydrogen flame and contacts the hydrogen flame, the contact is insufficient, and a person skilled in the art can easily think that the air is supplied from bottom to top, but compared with the invention, the air is lack of gathering, so that the amount of air flowing towards the flame core and inner flame of the hydrogen flame is less than that of the invention, and the flame combustion firstly occurs at the flame core of the hydrogen flame, so that the combustion is insufficient compared with the invention;
2. when the nozzle of the spray pipe needs to be cleaned, the cleaning mechanism is in a cleaning state, so that the nozzle is positioned in a closed cleaning area, meanwhile, air enters a gap b after passing through an air pipe, an annular groove, a middle hole II, a middle hole I and an annular wall, and carrier gas enters the spray pipe through the air pipe and is sprayed out from the nozzle, and the carrier gas flows towards a small pressure part based on the air, so that the air and the carrier gas are finally discharged outwards through a fixed pipe, a connector and an ash discharge pipe, the scraped ash is carried out together in the discharging process, and the ash is mainly carried out by the aid of the air in the process, and the carrier gas is arranged in such a way that the nozzle is blocked for preventing the ash from entering the nozzle, and the carrier gas is generally nitrogen and the like, so that the manufacturing cost is high;
3. when the invention is not used, the spray pipe can be driven to move downwards, so that the spray nozzle of the spray pipe is positioned in a closed cleaning area, and the spray nozzle is protected.
4. In addition, in the invention, the cleaning mechanism is of a purely mechanical structure, and the meaning is that the temperature of the hydrogen flame combustion chamber is required to be higher than 100 ℃ and is generally 150 ℃, the purely mechanical structure is not affected by high temperature, and in the ash cleaning structure which is driven by a power source such as a motor and is easily thought by a person skilled in the art, related circuits are easily affected by high temperature, high temperature resistant treatment is required to be carried out on the related circuits, such as coating of high temperature resistant materials and the like, so that the cost is high, and the use and maintenance are inconvenient.
5. In addition, the air inlet device is arranged, so that quantitative air without fluctuation can be continuously supplied to the detection device, the air flow is adjustable, the hydrogen flame combustion process is not influenced by the air fluctuation, and the detection sensitivity is further improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an internal schematic diagram of the present invention;
FIG. 3 is a schematic illustration of the detection device in use;
FIG. 4 is an internal schematic view of the detection device in use;
FIG. 5 is an internal schematic view of the detection device when not in use or when deashing;
FIG. 6 is a cross-sectional view of the detection device in use;
FIG. 7 is a cross-sectional view of the detection device when not in use or when deashing;
FIG. 8 is a partial cross-sectional view of a cleaning mechanism;
FIG. 9 is a partial schematic view of a cleaning mechanism;
FIG. 10 is a schematic view of a ring seat and a movable ring;
FIG. 11 is a cross-sectional view of a cleaning monomer;
FIG. 12 is a schematic view of an air intake device;
FIG. 13 is a partial schematic view of an air intake device;
FIG. 14 is a partial schematic view of a trigger valve, an inlet main pipe, and an outlet main pipe;
fig. 15 is a cross-sectional view of the trigger valve.
The reference numerals in the drawings are:
100. an air intake device; 101. a tank body; 102. a guide rod; 103. a second screw rod; 104. a third motor; 105. a movable bracket; 106. an air inlet main pipe; 107. a main air outlet pipe; 108. a side pipe I; 109. a second side pipe; 110. a first branch pipe; 111. a second branch pipe; 112. pushing a frame; 113. a connecting rod; 114. a rack; 115. a gear; 116. a valve housing; 117. a valve core; 118. a valve rod.
200. A gas storage tank;
300. a detection device; 301. a mounting frame; 302. an ion chamber; 303. a hydrogen pipe; 304. a gas carrying tube; 305. an air tube; 306. a reserve tube; 307. an ash discharge pipe; 308. a first motor; 309. a first screw rod; 310. a mounting base; 311. a second motor;
400. a cleaning mechanism; 401. a fixing seat; 402. a ring groove; 403. a fixed body; 404. a joint; 405. a ring seat; 4051. a guide groove; 406. a movable ring; 4061. the pushing block; 407. a first spring; 408. cleaning the monomers; 4081. sealing blocks; 4082. a slide block; 4083. a second inclined plane; 4084. a scraper; 4085. a fixed rod; 4086. a push-up block; 4087. a second spring;
500. a spray pipe; 501. and (5) fixing the sleeve.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present invention with reference to the accompanying drawings and preferred embodiments.
In fig. 3 to 5 of the present invention, a refers to an emitter; b refers to a collector, c refers to an igniter, which can be realized in the prior art and will not be described in detail.
Example 1
As shown in fig. 1-11, a VOCs on-line monitoring apparatus comprises a detection device 300, wherein the detection device 300 comprises a mounting frame 301, an ion chamber 302 in a cylindrical shape is mounted on the mounting frame 301, a spray pipe 500 in lifting arrangement is coaxially arranged in the ion chamber 302, and the upper end of the spray pipe 500 is in a nozzle shape.
The detection apparatus 300 further includes a tube set for pulling the hydrogen, carrier gas, and air to flow into the ion chamber 302, a cleaning mechanism 400, and a linear module for pulling the nozzle 500 to perform a lifting motion.
The cleaning mechanism 400 is arranged between a guiding state and a cleaning state to switch, when the cleaning mechanism 400 is in the guiding state, the cleaning mechanism 400 is opened and is used for guiding part of air to move towards the axis of the spray pipe 500, compared with the prior art, part of air gathers around the flame and flows towards the flame core and the inner flame of the flame, the other part of air wraps the outer flame of the flame, so that the hydrogen is combusted more fully, the combustion is fully favorable for improving the accuracy of a detection result, when the cleaning mechanism 400 is in the cleaning state, the cleaning mechanism 400 is folded and forms a closed cleaning area, the nozzle of the spray pipe 500 is positioned in the cleaning area, and ash generated by cleaning and cleaned by the cleaning mechanism 400 is guided to be output outwards.
Specifically, the cleaning mechanism 400 is as follows:
as shown in fig. 8, the cleaning mechanism 400 includes a fixing seat 401 disposed at a lower opening of the ion chamber 302, an installation hole is formed in an upper end surface of the fixing seat 401 in a penetrating manner, an annular groove 402 in an annular shape is formed in a lower end surface of the fixing seat 401, the annular groove 402 is located at an outer side of the installation hole, the annular groove 402 and the ion chamber 302 are coaxial, and a ring cover is disposed at a notch of the annular groove 402.
The cleaning mechanism 400 further comprises a fixing body 403, the fixing body 403 comprises a fixing tube coaxially and fixedly arranged in the mounting hole, an external step coaxially extends out of the fixing tube and is fixedly attached to the upper end face of the fixing seat 401, a first middle hole is formed in the external step, and a second middle hole for communicating the annular groove 402 with the first middle hole is formed in the upper end face of the fixing seat 401.
The outer circle surface of the external step extends upwards coaxially to form a ring wall, the upper end of the ring wall is provided with a mounting step, and the mounting step is provided with a ring seat 405 in a ring shape.
The lower pipe orifice of the fixed pipe is provided with a joint 404, and the upper end of the spray pipe 500 sequentially passes through the joint 404 and the fixed pipe and then is positioned in the ion chamber 302, wherein a gap a is formed between the outer wall of the spray pipe 500 and the inner wall of the fixed pipe, and the gap a is communicated with the joint 404.
As shown in fig. 9 and 10, the upper end surface of the ring seat 405 is provided with a plurality of guide grooves 4051 along the radial direction, the guide grooves 4051 are provided with a plurality of guide grooves 4051 along the circumferential direction of the ring seat 405, and each guide groove 4051 is internally provided with a group of cleaning monomers 408.
The upper end surface of the ring seat 405 is further provided with a driving component for driving the cleaning monomers 408 to move in the guide groove 4051, and all the cleaning monomers 408 cooperate in the moving process of the cleaning monomers 408 to form a closed cleaning area, as shown in fig. 5 and 7, and can be opened to open the cleaning area, as shown in fig. 4 and 6.
As shown in fig. 6, 7 and 11, the cleaning unit 408 includes a sliding block 4082 slidably disposed in the guide groove 4051, the upper end surface of the sliding block 4082 extends to form a sealing block 4081, and when the sealing blocks 4081 in all the cleaning units 408 are folded and contact with each other, all the sealing blocks 4081 cooperate to seal the upper opening of the ring seat 405, and in addition, the surface of the sealing block 4081 facing the axis of the ring seat 405 is in a cambered surface shape coaxial with the ring seat 405, so when all the sealing blocks 4081 cooperate to seal the upper opening of the ring seat 405, all the sealing blocks 4081 cooperate to form a conical area, which is a cleaning area.
The cambered surface of the sealing block 4081 is also provided with a jack in a penetrating way along the radial direction, a scraping plate 4084 is inserted into the jack, the surface of the scraping plate 4084 facing the axial lead of the ring seat 405 is in a cambered surface shape coaxial with the ring seat 405, one side of the scraping plate 4084 facing away from the axial lead of the ring seat 405 is provided with a third inclined surface, and the distance between the third inclined surface and the axial lead of the ring seat 405 is increased from bottom to top.
The up end of slider 4082 still is provided with dead lever 4085 up vertically, and the upper end of dead lever 4085 is provided with the spacing ring, and the outside slidable mounting of dead lever 4085 has push up piece 4086, and the outside of dead lever 4085 still overlaps and is equipped with the spring second 4087 that is located between slider 4082 and push up piece 4086, and one side of push up piece 4086 towards the axis of ring seat 405 is provided with inclined plane fourth, and inclined plane fourth is parallel to inclined plane third and both laminating.
In the initial state, the second spring 4087 is in a compressed state, as shown in fig. 6, at this time, one side of the cleaning monomer 408 facing the axis of the ring seat 405 contacts with the outer circular surface of the pipe body of the nozzle 500;
when cleaning is needed, the spray pipe 500 moves downwards, the spray nozzle of the spray pipe 500 is in a conical shape, in the process that the spray nozzle is gradually located in a cleaning area, the driving assembly drives all cleaning monomers 408 to fold synchronously, when the spray nozzle is completely located in the cleaning area, the outer circular surface of the spray nozzle contacts with the cambered surface of the sealing block 4081 after the cleaning monomers 408 are folded, then, the spray pipe 500 continues to move downwards by a small extent for a preset distance, a gap b is formed between the spray nozzle and the cambered surface of the sealing block 4081, at the same time, the spring II 4087 releases elasticity to enable the upper pushing block 4086 to move upwards, under the cooperation of the inclined plane III and the inclined plane IV, the upper pushing block 4086 moves upwards to push the scraping plate 4084 to move close to the spray nozzle, finally, the cambered surface of the scraping plate 4084 contacts with the outer circular surface of the spray pipe 500 rotates, and ash scraping cleaning is carried out on the outer circular surface of the spray nozzle through the scraping plate 4084.
Further, as shown in fig. 9-11, the driving assembly includes a movable ring 406 coaxially located above the ring seat 405, an inner circular surface of the movable ring 406 extends to form a pushing block 4061, the pushing block 4061 is slidably inserted into the guide groove 4051, a first inclined surface is disposed on a side of the pushing block 4061 facing the axial line of the ring seat 405, a distance between the first inclined surface and the axial line of the ring seat 405 decreases from bottom to top, a second inclined surface 4083 is disposed on a side of the sliding block 4082 facing away from the axial line of the ring seat 405, and the second inclined surface 4083 is parallel to the first inclined surface and is mutually attached to the first inclined surface.
A ring plate is coaxially arranged above the movable ring 406, and a first spring 407 is arranged between the ring plate and the movable ring 406.
When the spray pipe 500 moves upwards to push the cleaning monomer 408 to retreat, under the cooperation of the first inclined plane and the second inclined plane 4083, the movable ring 406 is pushed by the cleaning monomer 408 to move upwards, and the first spring 407 is compressed; when the nozzle 500 moves down, the first spring 407 releases the elastic force, and the cleaning unit 408 moves toward the axis of the ring seat 405 under the cooperation of the first inclined surface and the second inclined surface 4083.
Specifically, the straight line module:
as shown in fig. 4 and fig. 5, the linear module comprises a first screw rod 309 vertically arranged on the mounting frame 301, wherein the first screw rod 309 is provided with at least two groups and is driven to synchronously rotate by a first motor 308 arranged on the mounting frame 301, a mounting seat 310 is arranged outside the first screw rod 309, and the first screw rod 309 can lift and move with the mounting seat 310 when rotating.
The second motor 311 is installed on the installation seat 310, the output shaft of the second motor 311 is in a hollow shaft shape and is coaxially sleeved outside the spray pipe 500, when the installation seat 310 moves in a lifting manner, the second motor 311 is moved together with the spray pipe 500, and the second motor 311 operates to drive the spray pipe 500 to rotate.
Specifically, the pipe group:
as shown in fig. 4 to 6, the pipe group includes a hydrogen pipe 303, a carrier gas pipe 304, an air pipe 305, an ash discharge pipe 307, and a reserve pipe 306.
Wherein the ash discharge pipe 307 communicates with the joint 404, and the air pipe 305 communicates with the ring groove 402.
The outside of spray pipe 500 is provided with the fixed cover 501 that is close to the mouth of pipe under oneself, and the connecting hole with fixed cover 501 inner chamber intercommunication has been seted up to the outer disc of spray pipe 500.
The hydrogen pipe 303 is communicated with the lower pipe orifice of the spray pipe 500, and the carrier gas pipe 304 is communicated with the fixed sleeve 501.
The working principle of the first embodiment is as follows:
during detection, the spray pipe 500 stretches out, hydrogen enters the spray pipe 500 through the hydrogen pipe 303 and is discharged from the spray nozzle and is ignited by the igniter c, meanwhile, carrier gas enters the spray pipe 500 through the carrier pipe 304 and is discharged from the spray nozzle, and enters the burning hydrogen flame, meanwhile, air flows upwards after passing through the air pipe 305, the annular groove 402, the middle hole II, the middle hole I and the annular wall, in the flowing process, a part of air flows upwards along the gaps of the opened cleaning monomers 408, the part of air wraps the hydrogen flame, the other part of air contacts with the cambered surface of the sealing block 4081 and is guided to gather at the outer circular surface of the spray pipe 500 along the cambered surface, and then disperses to two sides and flows upwards through the gaps, and as the part of air is gathered close to the spray pipe 500, the part of air finally flows towards the flame center and the inner flame of the hydrogen flame, that is, under the guidance of the detection device 300, the part of air wraps the hydrogen flame, the part of air flows towards the flame center of the hydrogen flame, the hydrogen flame contacts with the air more fully, and the burning of the hydrogen flame is more fully;
in the prior art, air generally enters from the side of the ion chamber 302, that is, air generally enters from the side of the hydrogen flame and contacts the hydrogen flame, the contact is insufficient, and as one skilled in the art will readily appreciate, air is supplied from bottom to top, but in comparison with the present invention, the amount of air flowing toward the flame core of the hydrogen flame, the inner flame, is less than in the present invention, and flame combustion occurs first at the flame core of the hydrogen flame, so that combustion is insufficient in comparison with the present invention.
In addition, the working processes of the emitter a, the collector b and the like of the hydrogen flame ionization detector are the prior art, and are not repeated.
When cleaning of the nozzle of the spout 500 is required:
firstly, the straight line module drives the spray pipe 500 to move downwards, in the process that the spray pipe starts to be gradually positioned in a cleaning area, the spring I407 releases elastic force, under the cooperation of the inclined plane I and the inclined plane II 4083, the cleaning monomers 408 move towards the axial line of the ring seat 405, all the cleaning monomers 408 are synchronously folded, when the spray pipe is completely positioned in the cleaning area, the cleaning monomers 408 are completely folded, the outer circular surface of the spray pipe contacts with the cambered surface of the sealing block 4081, then the spray pipe 500 continuously moves downwards by a preset distance by a small margin, a gap b is formed between the spray pipe and the cambered surface of the sealing block 4081, meanwhile, the spring II 4087 releases elastic force to enable the push-up block 4086 to move upwards, and under the cooperation of the inclined plane III and the inclined plane IV, the push-up block 4086 moves upwards to push the scraping plate 4084 to move close to the spray pipe, and finally the cambered surface of the scraping plate 4084 contacts with the outer circular surface of the spray pipe;
then, the second motor 311 operates to drive the nozzle 500 to rotate, and the scraping blade 4084 scrapes ash on the outer surface of the nozzle, and at the same time, air enters the gap b through the air pipe 305, the ring groove 402, the second middle hole, the first middle hole and the ring wall, and carrier gas enters the nozzle 500 through the air pipe 304 and is sprayed out from the nozzle, so that the air and the carrier gas are finally discharged outwards through the fixed pipe, the joint 404 and the ash discharge pipe 307 based on the gas flowing towards the small pressure, and the scraped ash is discharged together in the discharging process, and it is noted that the ash is mainly discharged by the air in the discharging process, and the carrier gas is arranged to prevent the ash from entering the nozzle and blocking the nozzle, so that the carrier gas is generally nitrogen and the like, and the manufacturing cost is high.
In addition, when the present invention is not in use, the nozzle 500 may be driven to move downward, and the nozzle of the nozzle 500 is located in a closed area (referred to as a cleaning area) by the detection device 300, so as to protect the nozzle.
Further, as shown in fig. 3, the backup tube 306 communicates with the interior chamber of the ion chamber 302, and air can be supplied toward the ion chamber 302 through the backup tube 306, so that the air in the ion chamber 302 is more abundant and the hydrogen flame burns more fully.
In addition, the hydrogen gas and the carrier gas may be supplied through the gas tank 200, or may be supplied through other means.
Example two
As shown in fig. 2, the air enters the ion chamber by means of an air pump or a blower, etc., and the flow rate of the air fluctuates to affect the flame, so that it is necessary to supply continuous and quantitative air to the duct group, and thus the present invention further includes the air inlet device 100.
As shown in fig. 12 to 15, the air intake device 100 includes a support frame, a tank 101 is mounted on the support frame, and a piston is mounted in the tank 101.
The support frame is provided with a second screw rod 103 and a guide rod 102 which are parallel to the tank body 101, the second screw rod 103 is driven to rotate by a third motor 104 arranged on the support frame, a movable support 105 is arranged outside the second screw rod 103, the movable support 105 is in sliding connection with the guide rod 102, when the third motor 104 drives the second screw rod 103 to rotate, the movable support 105 moves along the guiding direction of the guide rod 102, the movable support 105 is in an annular support shape coaxially encircling the outside of the tank body 101, a strong magnet a is arranged on the movable support 105, a strong magnet b is inlaid on a piston, and the movable support 105 moves along with the piston through magnetic coupling between the strong magnets a and b.
As shown in fig. 13, a first side pipe 108 is provided at one end of the tank 101, a second side pipe 109 is provided at the other end, an inlet main pipe 106, an outlet main pipe 107 and trigger valves are provided on the support frame, and the trigger valves are provided in two groups and are respectively located at two sides of the tank 101.
Specifically, as shown in fig. 15, the trigger valve includes a valve housing 116 and a valve core 117 rotatably disposed in the valve housing 116, a valve rod 118 extending out of the valve housing 116 extends from an end surface of the valve core 117, a first nozzle and a second nozzle are disposed on a side surface of the valve housing 116, a third nozzle is disposed at an end portion of the valve housing, a first valve groove communicated with the third nozzle is disposed on the valve core 117, a second valve groove communicated with the first valve groove is disposed on a side surface of the valve core 117, and in a rotating process of the valve core 117, the second valve groove can be communicated with the first nozzle or the second nozzle, and the first valve groove and the second valve groove jointly form a valve hole.
As shown in fig. 13-15, a rack 114 parallel to the can 101 is provided on the support frame, the rack 114 is meshed with a gear 115 provided on a valve rod 118, two groups of racks 114 are correspondingly provided, the two groups of racks 114 are connected through a connecting rod 113, a step is provided at the joint of the connecting rod 113 and the rack 114, a pushing frame 112 is provided on the movable support 105, and the pushing frame 112 contacts with the step in the process of following the movement of the movable support 105, so that the racks 114 move, and the states of the two groups of trigger valves change.
As shown in fig. 13 and 14, the two sets of trigger valves are named as a first trigger valve and a second trigger valve, respectively, and the states of the two trigger valves are always opposite.
The tail end of the side pipe I108 is communicated with the third nozzle of the trigger valve I, and the tail end of the side pipe II 109 is communicated with the third nozzle of the trigger valve;
one end of the air inlet main pipe 106 is provided with a filter, the other end of the air inlet main pipe 106 is communicated with a second nozzle of the trigger valve II, and the air inlet main pipe 106 is communicated with the second nozzle of the trigger valve I through a first branch pipe 110.
One end of the main air outlet pipe 107 is communicated with an air pipe 305 and a standby pipe 306 in the detection device 300, air is induced towards the detection device 300, the other end of the main air outlet pipe 107 is communicated with a first connector of the trigger valve I, and the main air outlet pipe 107 is communicated with the second trigger valve through a second branch pipe 111.
The operation of the air intake device 100 is as follows:
when the first valve groove is communicated with the first joint mouth, the trigger valve is in an air outlet state, and when the first valve groove is communicated with the second joint mouth, the trigger valve is in an air inlet state;
taking the perspective in fig. 12 as an example:
the first trigger valve is positioned at the left side and is in an air inlet state, the second trigger valve is positioned at the right side and is in an air outlet state, when the piston moves rightwards, air positioned at the right side of the piston is pushed to flow towards the detection device 300 sequentially through the second side pipe 109, the second trigger valve, the second branch pipe 111 and the air outlet main pipe 107, and clean air filtered by the filter sequentially enters the tank body 101 through the air inlet main pipe 106, the first branch pipe 110, the first trigger valve and the first side pipe 108 and is positioned at the left side of the piston;
when the piston moves to be in contact with the right end of the tank body 101, the pushing frame 112 pushes the racks 114 to move, the two racks 114 move together through the connecting rod 113, so that the state of the trigger valve is changed, the first trigger valve is switched to an air outlet state, and the second trigger valve is switched to an air inlet state;
then, the piston moves leftwards, air at the left side of the piston is pushed against and flows towards the detection device 300 sequentially through the first side pipe 108, the first trigger valve and the first air outlet main pipe 107, and clean air filtered by the filter sequentially enters the tank body 101 through the first air inlet main pipe 106, the second trigger valve and the second side pipe 109 and is positioned at the right side of the piston;
thus, the air is sensed towards the detecting device 300, and the speed of the piston is controlled, so that continuous, quantitative and wave-free air can be supplied to the detecting device 300 by controlling the speed of the piston, and the flow rate of the air is adjustable.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (10)
1. The utility model provides a VOCs on-line monitoring instrument, includes detection device (300), and detection device (300) include mounting bracket (301), install ion room (302) that are the cylinder shape on mounting bracket (301), its characterized in that: a spray pipe (500) which is arranged in a lifting way is coaxially arranged in the ion chamber (302), the upper end of the spray pipe (500) is provided with a spray nozzle, and the spray nozzle is in a conical shape; the detection device (300) further comprises a pipeline group, a cleaning mechanism (400) and a linear module, wherein the pipeline group is used for pulling hydrogen, carrier gas and air to flow towards the inside of the ion chamber (302), the linear module is used for pulling the spray pipe (500) to perform lifting movement, the cleaning mechanism (400) is arranged between a guiding state and a cleaning state to switch, when the cleaning mechanism (400) is in the guiding state, the cleaning mechanism (400) is opened and is used for guiding part of air to move towards the axis of the spray pipe (500) to gather, when the cleaning mechanism is in the cleaning state, the cleaning mechanism (400) is folded to form a closed cleaning area, the nozzle of the spray pipe (500) is positioned in the cleaning area and is cleaned by the cleaning mechanism (400), and ash generated by cleaning is guided by the cleaning mechanism (400) to be output outwards.
2. The on-line monitoring instrument for VOCs according to claim 1, wherein: the cleaning mechanism (400) comprises a fixing seat (401) arranged at the lower opening of the ion chamber (302), a mounting hole is formed in the upper end face of the fixing seat (401) in a penetrating mode, an annular groove (402) in an annular shape is formed in the lower end face of the fixing seat (401), the mounting hole, the annular groove (402) and the ion chamber (302) are coaxial, and a ring cover is arranged at the notch of the annular groove (402); the cleaning mechanism (400) further comprises a fixing body (403), the fixing body (403) comprises a fixing pipe coaxially and fixedly arranged in the mounting hole, an external step coaxially extends out of the fixing pipe, the external step is fixedly attached to the upper end face of the fixing seat (401), a first middle hole is formed in the external step, a second middle hole used for enabling the annular groove (402) to be communicated with the first middle hole is formed in the upper end face of the fixing seat (401), an annular wall coaxially extends upwards from the outer circular face of the external step, and an annular seat (405) in an annular shape is arranged at the upper end of the annular wall.
3. The VOCs on-line monitoring instrument of claim 2, wherein: the lower pipe orifice of the fixed pipe is provided with a joint (404), the upper end of the spray pipe (500) passes through the joint (404) and the fixed pipe and then is positioned in the ion chamber (302), and a gap a is formed between the outer wall of the spray pipe (500) and the inner wall of the fixed pipe.
4. A VOCs on-line monitoring instrument according to claim 3, characterized in that: the upper end face of the ring seat (405) radially penetrates through the guide groove (4051), the guide groove (4051) is provided with a plurality of cleaning monomers (408) along the circumferential direction of the ring seat (405), each guide groove (4051) is internally provided with a cleaning monomer (408), and the upper end face of the ring seat (405) is further provided with a driving assembly for driving the cleaning monomers (408) to move in the guide groove (4051).
5. The on-line monitoring instrument for VOCs of claim 4, wherein: the cleaning monomers (408) comprise sliding blocks (4082) which are slidably arranged in the guide grooves (4051), sealing blocks (4081) are extended from the upper end surfaces of the sliding blocks (4082), the surfaces of the sealing blocks (4081) facing the axial line of the ring seat (405) are in cambered surface shapes coaxial with the ring seat (405), when the sealing blocks (4081) in all the cleaning monomers (408) are folded and mutually contacted, the upper openings of the ring seat (405) can be sealed by the cooperation of all the sealing blocks (4081), and a cleaning area in a conical shape is formed by the cambered surface cooperation of all the sealing blocks (4081); the cambered surface of the sealing block (4081) is also provided with a jack in a penetrating way along the radial direction, a scraping plate (4084) is inserted into the jack, and the surface of the scraping plate (4084) facing the axial lead of the ring seat (405) is in a cambered surface shape coaxial with the ring seat (405).
6. The on-line monitoring instrument for VOCs according to claim 5, wherein: one side of the scraping plate (4084) away from the axial lead of the ring seat (405) is provided with a third inclined plane, and the distance between the third inclined plane and the axial lead of the ring seat (405) increases from bottom to top; the upper end face of the sliding block (4082) is vertically upwards provided with a fixed rod (4085), the upper end of the fixed rod (4085) is provided with a limiting ring, an upper pushing block (4086) is slidably arranged outside the fixed rod (4085), a second spring (4087) positioned between the sliding block (4082) and the upper pushing block (4086) is further sleeved outside the fixed rod (4085), one side, facing the axial lead of the ring seat (405), of the upper pushing block (4086) is provided with a fourth inclined plane, the fourth inclined plane is parallel to the third inclined plane and is attached to the third inclined plane, and the second spring (4087) is in a compressed state in an initial state.
7. The on-line monitoring instrument for VOCs according to claim 5, wherein: the driving assembly comprises a movable ring (406) coaxially arranged above a ring seat (405), a pushing block (4061) is extended from the inner circular surface of the movable ring (406), the pushing block (4061) is inserted into the guide groove (4051) in a sliding mode, one side, facing towards the axis of the ring seat (405), of the pushing block (4061) is provided with a first inclined surface, the distance between the first inclined surface and the axis of the ring seat (405) is decreased downwards from bottom to top, one side, facing away from the axis of the ring seat (405), of the sliding block (4082) is provided with a second inclined surface (4083), the second inclined surface (4083) is parallel to the first inclined surface and is mutually attached to the first inclined surface, a ring plate is coaxially arranged above the movable ring (406), and a first spring (407) is arranged between the ring plate and the movable ring (406).
8. The on-line monitoring instrument for VOCs according to claim 1 or 6, wherein: the linear module comprises a mounting seat (310) which is arranged in a lifting manner, a motor II (311) is mounted on the mounting seat (310), and an output shaft of the motor II (311) is in a hollow shaft shape and is coaxially sleeved outside the spray pipe (500).
9. The on-line monitoring instrument for VOCs of claim 6, wherein: the pipeline group comprises a hydrogen pipe (303), a carrier gas pipe (304), an air pipe (305) and an ash discharge pipe (307), wherein the ash discharge pipe (307) is communicated with a joint (404), the air pipe (305) is communicated with an annular groove (402), a fixed sleeve (501) close to a lower pipe opening of the nozzle (500) is arranged outside the nozzle (500), a connecting hole communicated with an inner cavity of the fixed sleeve (501) is formed in the outer circular surface of the nozzle (500), the hydrogen pipe (303) is communicated with the lower pipe opening of the nozzle (500), and the carrier gas pipe (304) is communicated with the fixed sleeve (501).
10. The on-line monitoring instrument for VOCs according to claim 1, wherein: it further comprises an air inlet device (100), the air inlet device (100) being adapted to continuously supply a quantity of air towards the detection device (300) and the flow of air being adjustable.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116858741A (en) * | 2023-09-04 | 2023-10-10 | 天津华泰清源环境技术有限公司 | Raise dust on-line monitoring system |
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| JPH1038851A (en) * | 1996-07-26 | 1998-02-13 | Shimadzu Corp | Hydrogen flame ionization detector |
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| CN116381166B (en) | 2023-08-01 |
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