CN107238518A - A kind of constant speed flue gas sampling detection means - Google Patents
A kind of constant speed flue gas sampling detection means Download PDFInfo
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- CN107238518A CN107238518A CN201610190320.7A CN201610190320A CN107238518A CN 107238518 A CN107238518 A CN 107238518A CN 201610190320 A CN201610190320 A CN 201610190320A CN 107238518 A CN107238518 A CN 107238518A
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- 238000001514 detection method Methods 0.000 title claims abstract description 148
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 239000003546 flue gas Substances 0.000 title claims abstract description 112
- 238000005070 sampling Methods 0.000 title claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 442
- 239000000523 sample Substances 0.000 claims abstract description 223
- 239000012159 carrier gas Substances 0.000 claims abstract description 145
- 238000002156 mixing Methods 0.000 claims abstract description 97
- 230000001105 regulatory effect Effects 0.000 claims abstract description 42
- 230000007246 mechanism Effects 0.000 claims abstract description 23
- 230000008859 change Effects 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims description 37
- 238000004140 cleaning Methods 0.000 claims description 32
- 238000012360 testing method Methods 0.000 claims description 29
- 239000008246 gaseous mixture Substances 0.000 claims description 25
- 238000010790 dilution Methods 0.000 claims description 22
- 239000012895 dilution Substances 0.000 claims description 22
- 238000004321 preservation Methods 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 6
- 230000033228 biological regulation Effects 0.000 claims description 2
- 230000003189 isokinetic effect Effects 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 14
- 239000003085 diluting agent Substances 0.000 description 11
- 239000002253 acid Substances 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000009833 condensation Methods 0.000 description 8
- 230000005494 condensation Effects 0.000 description 8
- 238000007865 diluting Methods 0.000 description 7
- 239000000428 dust Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000007812 deficiency Effects 0.000 description 4
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- 238000013459 approach Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
- G01N2001/242—Injectors or ejectors
Abstract
The present invention relates to the technical field of gas detection, a kind of constant speed flue gas sampling detecting system is disclosed.In order to solve can not isokinetic sampling the problem of, it is proposed that following technical scheme.It is characterized in that：Including：Sample tracheae (2), air mixing machine structure (13), gas mixing pipe road (14), detection unit (CLDY) containing probe, ejector (SLQ), the jet gas electric control valve (51) adjusted in real time to jet throughput size, jet blower (SF), carrier gas blower fan (XF), carrier gas regulating valve (52), the first, second flow rate detection mechanism for making to detect to various gas flow rates；By adjusting the aperture size of jet gas electric control valve (51) in real time, change the flow velocity size of mixed gas, and then sample gas velocity is tended to be equal with flue gas flow rate.Beneficial effect is：Isokinetic sampling is realized, accuracy of detection is increased substantially.
Description
Technical field
The present invention relates to the technical field of gas sample, detection and analysis, more particularly to a kind of constant speed flue gas sampling detection means, present invention is particularly suitable for the sample detecting to flue gas particles.
Background technology
In thermal power plant, discarded flue gas is by discharge tube to airborne release；Discharge tube is also referred to as flue.For the purpose of environmental protection, it usually needs carry out drop harm reason to the flue gas of discharge, such as carry out depositing dust processing to flue gas, could be discharged after making dust content up to standard；Thus, the flue gas in discharge tube is carried out to detect just into essential work.
In order to which the flue gas to discharge tube is detected, people are provided with sample tracheae in discharge tube, in the way of negative pressure, continuously extract and obtain flue gas sample gas.In the prior art, use predicted velocity to determine the size in sample tracheae sampling mouthpiece footpath, so as to be sampled.However, because the mode of sampling predicted velocity can not accomplish real-time tracking in change the flow velocity moment in flue, the sample gas of extraction can not ensure that its is representative.The situation of flue gas flow rate and the endotracheal sample gas velocity of sample in discharge tube, as shown in Fig. 1, Fig. 2 and Fig. 3, the big arrow in each figure represents the flow direction of flue gas.
In above-mentioned three figure, V is the endotracheal sample gas velocity of sample, and W is the flue gas flow rate in discharge tube.Only when sample gas velocity V be equal to flue gas flow rate W when, i.e., only isokinetic sampling when, sample aerated particle thing concentration just it is representative, as shown in Figure 1.When sample gas velocity V is more than flue gas flow rate W, sample gas concentration can be less than actual concentrations, and situation is referring to Fig. 2.When sample gas velocity V is less than flue gas flow rate W, sample gas concentration can be more than actual flue gas concentration, and situation is referring to Fig. 3.
Non- isokinetic sampling influences very big to measurement accuracy, and engineering technological, which is needed badly, can solve the problem that this problem.
The content of the invention
In order to solution by no means isokinetic sampling the problem of, realize the purpose of isokinetic sampling, the present invention proposes following technical scheme.
1. a kind of constant speed flue gas sampling detection means, including：Automation control circuit, sample tracheae, air mixing machine structure, gas mixing pipe road, detection unit containing probe, ejector, the jet gas electric control valve adjusted in real time to jet throughput size, jet blower, carrier gas blower fan, carrier gas regulating valve, the first flow velocity testing agency for making to detect to flue gas flow rate in flue gas exhausting pipe line, and the second flow speed testing agency detected to specific gas flow velocity；Described specific gas flow velocity refers to three：Sample gas velocity, carrier gas flow velocity and gaseous mixture flow velocity, described progress detection is directly to be detected, or described progress detection is to carry out directly detection plus indirect detection；Described ejector contains active air inlet port, passive air inlet port and air outlet；
One end of sample tracheae is goed deep into flue gas exhausting pipe line, and the other end of sample tracheae is connected with air mixing machine structure gas circuit；Air mixing machine structure is connected with one end gas circuit of gas mixing pipe road, and the other end of gas mixing pipe road is connected with the passive air inlet port gas circuit of ejector；
Described carrier gas blower fan, its air inlet and atmosphere；The gas outlet of carrier gas blower fan is connected with the input interface gas circuit of carrier gas regulating valve；The output interface of carrier gas regulating valve is connected with air mixing machine structure gas circuit；
Described jet blower, its air inlet and atmosphere, its gas outlet are connected with the input port gas circuit of jet gas electric control valve；The output port of jet gas electric control valve is connected with the active air inlet port gas circuit of ejector；The terminals of jet gas electric control valve are electrically connected with automation control circuit；
The probe of detection unit is arranged on the body portion of gas mixing pipe road；
First flow velocity testing agency, it is arranged in flue gas exhausting pipe line, and its terminals is electrically connected with automation control circuit；
The terminals of second flow speed testing agency are electrically connected with automation control circuit.
2. described in second flow speed testing agency, its setting is as follows：
Sample gas velocity detection part is set at sample tracheae, the fast detection part of mixed air-flow is set at gas mixing pipe road, and carrier gas flow velocity detection part is set at the gas channels between carrier gas regulating valve output interface and air mixing machine structure；
The fast detection part of sample gas velocity detection part, mixed air-flow and carrier gas flow velocity detection part, their terminals are each electrically connected with automation control circuit respectively.
3. described in second flow speed testing agency, it is set to any one in following three：
A., sample gas velocity detection part, and the fast detection part of setting mixed air-flow at gas mixing pipe road are set at sample tracheae；Sample gas velocity detection part and the fast detection part of mixed air-flow, their terminals are each electrically connected with automation control circuit respectively；
B. set at sample tracheae and carrier gas flow velocity detection part is set at sample gas velocity detection part, and gas channels between carrier gas regulating valve output interface and air mixing machine structure；Sample gas velocity detection part and carrier gas flow velocity detection part, their terminals are each electrically connected with automation control circuit respectively；
C., the fast detection part of mixed air-flow is set at gas mixing pipe road, and carrier gas flow velocity detection part is set at the gas channels between carrier gas regulating valve output interface and air mixing machine structure；Mixed air-flow speed detection part and carrier gas flow velocity detection part, their terminals are each electrically connected with automation control circuit respectively.
4. described in device include：Sample gas Heat preservation part, it is arranged at sample tracheae, and its terminals is electrically connected with automation control circuit；Described automation control circuit includes power circuit.
5. described in device include：Carrier gas heater block；
The gas outlet of carrier gas blower fan is connected with the input interface of carrier gas regulating valve by diluting heating connecting tube；Described carrier gas heater block, it is arranged at dilution heating connecting tube, and its terminals is electrically connected with automation control circuit；Described automation control circuit includes power circuit.
6. described in device include：Jet gas heater block；
The output port of jet gas electric control valve is connected with the active air inlet port of ejector by jet heating tube；Described jet gas heater block, it is arranged at jet heating tube, and its terminals is electrically connected with automation control circuit；Described automation control circuit includes power circuit.
7. described in device include：Blowback cleaning mechanism；
Described blowback cleaning mechanism includes：Electric T-shaped valve and blowback magnetic valve；Electric T-shaped valve contains first interface, second interface and the 3rd interface；Blowback magnetic valve contains input interface and output interface；
Described gas mixing pipe road includes anterior pipeline and rear portion pipeline；Air mixing machine structure, the anterior pipeline of gas mixing pipe road, the first interface of electric T-shaped valve, three's order gas circuit connection；The second interface of electric T-shaped valve, the rear portion pipeline of gas mixing pipe road, the passive air inlet port of ejector, the connection of this three's order gas circuit；3rd interface of electric T-shaped valve is connected by tracheae with the output end gas circuit of jet gas electric control valve；
Described blowback magnetic valve, its input interface is connected with the input interface gas circuit of carrier gas regulating valve, and its output interface is connected with the rear portion pipeline gas circuit of gas mixing pipe road；
The terminals of electric T-shaped valve are electrically connected with automation control circuit；The terminals of blowback magnetic valve are electrically connected with automation control circuit；
The probe of detection unit is arranged at the rear portion pipeline of gas mixing pipe road.
8. described in device include：Carrier gas heater block and blowback cleaning mechanism；
The gas outlet of carrier gas blower fan is connected with the input interface of carrier gas regulating valve by diluting heating connecting tube；Described carrier gas heater block, it is arranged at dilution heating connecting tube；
Described blowback cleaning mechanism includes：Electric T-shaped valve and blowback magnetic valve；Electric T-shaped valve contains first interface, second interface and the 3rd interface；Blowback magnetic valve contains input interface and output interface；
Described gas mixing pipe road includes anterior pipeline and rear portion pipeline；Air mixing machine structure, the anterior pipeline of gas mixing pipe road, the first interface of electric T-shaped valve, three's order gas circuit connection；The second interface of electric T-shaped valve, the rear portion pipeline of gas mixing pipe road, the passive air inlet port of ejector, the connection of this three's order gas circuit；3rd interface of electric T-shaped valve is connected by tracheae with the output end gas circuit of jet gas electric control valve；
Described blowback magnetic valve, its input interface is connected with dilution heating connecting tube gas circuit, and its output interface is connected with the rear portion pipeline gas circuit of gas mixing pipe road；
The terminals of carrier gas heater block are electrically connected with automation control circuit；The terminals of electric T-shaped valve are electrically connected with automation control circuit；The terminals of blowback magnetic valve are electrically connected with automation control circuit；Described automation control circuit includes power circuit；
The probe of detection unit is arranged at the rear portion pipeline of gas mixing pipe road.
9. described in device include：Sample gas Heat preservation part, carrier gas heater block, jet gas heater block, and blowback cleaning mechanism；
Described sample gas Heat preservation part, it is arranged at sample tracheae；
The gas outlet of carrier gas blower fan is connected with the input interface of carrier gas regulating valve by diluting heating connecting tube；Described carrier gas heater block (32), it is arranged at dilution heating connecting tube；
The output port of jet gas electric control valve is connected with the active air inlet port of ejector by jet heating tube；Described jet gas heater block, it is arranged at jet heating connecting tube；
Described blowback cleaning mechanism includes：Electric T-shaped valve and blowback magnetic valve；Electric T-shaped valve contains first interface, second interface and the 3rd interface；Blowback magnetic valve contains input interface and output interface；
Described gas mixing pipe road includes anterior pipeline and rear portion pipeline；Air mixing machine structure, the anterior pipeline of gas mixing pipe road, the first interface of electric T-shaped valve, three's order gas circuit connection；The second interface of electric T-shaped valve, the rear portion pipeline of gas mixing pipe road, the passive air inlet port of ejector, the connection of this three's order gas circuit；3rd interface of electric T-shaped valve heats connecting tube gas circuit by tracheae and jet and connected；
Described blowback magnetic valve, its input interface is connected with dilution heating connecting tube gas circuit, and its output interface is connected with the rear portion pipeline gas circuit of gas mixing pipe road；
The probe of detection unit is arranged at the rear portion pipeline of gas mixing pipe road；
The terminals of sample gas Heat preservation part are electrically connected with automation control circuit；The terminals of carrier gas heater block are electrically connected with automation control circuit；The terminals of jet gas heater block are electrically connected with automation control circuit；The terminals of electric T-shaped valve are electrically connected with automation control circuit；The terminals of blowback magnetic valve are electrically connected with automation control circuit；Described automation control circuit includes power circuit.
The beneficial effects of the invention are as follows：
Isokinetic sampling is realized, flue gas can in real time be detected, and accuracy of detection is increased substantially.
Brief description of the drawings
Fig. 1 is the schematic diagram that sample gas velocity V is equal to flue gas flow rate W；
Fig. 2 is the schematic diagram that sample gas velocity V is more than flue gas flow rate W；
Fig. 3 is the schematic diagram that sample gas velocity V is less than flue gas flow rate W；
Fig. 4 is one of schematic diagram of detection means of the present invention；
Fig. 5 is the two of the schematic diagram of detection means of the present invention；
Fig. 6 is the three of the schematic diagram of detection means of the present invention；
Fig. 7 is the four of the schematic diagram of detection means of the present invention；
Fig. 8 is the five of the schematic diagram of detection means of the present invention；
Fig. 9 is the six of the schematic diagram of detection means of the present invention；
Figure 10 is the seven of the schematic diagram of detection means of the present invention；
The device that Figure 11 is provided with the invention device schematic diagram of blowback cleaning mechanism, this figure is in conventional detection state；
Figure 12 is the equivalent schematic drawing of Figure 11 gas circuits walking situation；
Figure 13 is that Figure 11 invention device is in the schematic diagram of blowback clean conditions；
Figure 14 is the equivalent schematic drawing of Figure 13 gas circuits walking situation；
Figure 15 is the eight of the schematic diagram of detection means of the present invention；
Figure 16 is the nine of the schematic diagram of detection means of the present invention.
Label declaration in figure
Sample tracheae 2；Flue gas exhausting pipe line 5；Air mixing machine structure 13；Gas mixing pipe road 14；First flow velocity testing agency 15；Carrier gas flow velocity detection part 16；Sample gas velocity detection part 18；Mixed air-flow speed detection part 19；Sample gas Heat preservation part 31；Carrier gas heater block 32；Jet gas heater block 33；Jet gas electric control valve 51；Carrier gas regulating valve 52.
Detection unit CLDY；Blowback magnetic valve FCF；Ejector SLQ；Jet blower SF；Carrier gas blower fan XF；Electric T-shaped valve STF；First interface S1；Second interface S2；3rd interface S3；The endotracheal sample gas velocity V of sample；Flue gas flow rate W in discharge tube.
In Fig. 1, Fig. 2, Fig. 3, the big arrow of discharge tube bottom represents the flow direction of flue gas.
Fig. 4 is into Figure 16, and the big arrow of the bottom of flue gas exhausting pipe line 5 represents the flow direction of flue gas, and remaining small arrow everywhere represents the direction of travel of position air-flow.
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
Embodiment
Prior art determines the size in sample tracheae sampling mouthpiece footpath using predicted velocity, is sampled；Therefore, for the flow velocity moment in flue in change, the mode of prior art can not accomplish real-time tracking, because the sample gas velocity and flue gas flow rate that are drawn into are unequal, so sample gas can not ensure that it is representative, cause last measurement accuracy error very big.
The technical scheme that the present invention is proposed, it is proposed that following isokinetic sampling's innovative approach so that the endotracheal sample gas velocity of sample constantly keeps equal with the flue gas flow rate in discharge tube.
First, the present invention is made the general description, and interpretation.
Overall plan of the present invention is described as follows：
A kind of constant speed flue gas sampling detection means of the present invention, including：Automation control circuit, sample tracheae 2, air mixing machine structure 13, gas mixing pipe road 14, detection unit CLDY containing probe, ejector SLQ, the jet gas electric control valve 51 adjusted in real time to jet throughput size, jet blower SF, carrier gas blower fan XF, carrier gas regulating valve 52, the first flow velocity testing agency 15 for making to detect to flue gas flow rate in flue gas exhausting pipe line 5, the second flow speed testing agency detected to specific gas flow velocity；Described specific gas flow velocity refers to three：Sample gas velocity, carrier gas flow velocity and gaseous mixture flow velocity, described progress detection is directly to be detected, or described progress detection is to carry out directly detection plus indirect detection；Described ejector SLQ contains active air inlet port, passive air inlet port and air outlet；
One end of sample tracheae 2 is goed deep into flue gas exhausting pipe line 5, and the other end of sample tracheae 2 is connected with the gas circuit of air mixing machine structure 13；Air mixing machine structure 13 is connected with one end gas circuit of gas mixing pipe road 14, and the other end of gas mixing pipe road 14 is connected with ejector SLQ passive air inlet port gas circuit；
Described carrier gas blower fan XF, its air inlet and atmosphere；Carrier gas blower fan XF gas outlet is connected with the input interface gas circuit of carrier gas regulating valve 52；The output interface of carrier gas regulating valve 52 is connected with the gas circuit of air mixing machine structure 13；
Described jet blower SF, its air inlet and atmosphere, its gas outlet are connected with the input port gas circuit of jet gas electric control valve 51；The output port of jet gas electric control valve 51 is connected with ejector SLQ active air inlet port gas circuit；The terminals of jet gas electric control valve 51 are electrically connected with automation control circuit；
Detection unit CLDY probe is arranged on the body portion of gas mixing pipe road 14；
First flow velocity testing agency 15, it is arranged in flue gas exhausting pipe line 5, and its terminals is electrically connected with automation control circuit；
The terminals of second flow speed testing agency are electrically connected with automation control circuit.
Overall plan description of the present invention is as above；Overall plan of the present invention is explained and explained again below.
1. understood referring to Fig. 4.
2. the flue gas in flue gas exhausting pipe line 5 is in the presence of negative pressure, sample gas is extracted via sample tracheae 2 and obtained.It is referred to as flue gas in flue gas exhausting pipe line 5, is referred to as sample gas into sample tracheae 2.Foregoing negative pressure, it is produced by ejector SLQ, is referred to and is introduced below.
3. carrier gas blower fan XF and jet blower SF, is air compressor in fact.
4. the detection unit CLDY containing probe, is the instrument detected to gas.
Detection unit CLDY includes detection unit main body and probe.The probe of broad sense is exactly sensor, and it includes：Pop one's head in part, and the circuit such as amplification, shaping；The probe of narrow sense only refers to part of popping one's head in.
For the probe of broad sense, it is a sensor, and its output signal can be detected unit main body and directly use.
For the probe of narrow sense, because the electric signal of probe part acquisition is too small and weak and is not sufficiently stable, so to be also equipped with the subsequent conditioning circuits such as amplification, shaping；So, in the case where probe is by narrow definition, detection unit main body further comprises the subsequent conditioning circuits such as amplification, shaping.
The either probe of broad sense or the probe of narrow sense, probe part are located in gas mixing pipe road, or say it is to be located at the sample gas gas (mixed gas) after dilution by way of part, it is hereby achieved that electric signal initially, original.
5. carrier gas blower fan XF air inlet and atmosphere, carrier gas blower fan XF gas outlet are connected with the input interface gas circuit of carrier gas regulating valve 52, the output interface of carrier gas regulating valve 52 is connected with the gas circuit of air mixing machine structure 13.
How much function of carrier gas regulating valve 52 itself can adjust passed through diluent gas；In patent of the present invention, sampling detector for multifunctional is when debugging, experiment, carrier gas regulating valve 52 can be adjusted, the size of diluent gas can be adjusted, but after device is in debugging, off-test, carrier gas regulating valve 52 just no longer changes, in other words, apparatus of the present invention are in daily operation, the compressed air (diluent gas) come out from carrier gas regulating valve 52, and its flow velocity, flows per unit time are substantially constant.
In brief, carrier gas regulating valve 52 come out diluting gas flow, constant flow rate, this feature, behind also to use.
6. the gas that detection unit CLDY is detected is mixed gas.
Mixed gas is formed by two kinds of gas mixings, and the first is the original sample gas come in from sample tracheae 2, and second is the diluent gas come from the output interface of carrier gas regulating valve 52；Foregoing two kinds of gas flows after the interior mixing of air mixing machine structure 13, then along gas mixing pipe road 14, is most discharged afterwards through ejector SLQ.Detection unit CLDY probe is arranged on the body portion of gas mixing pipe road 14, and probe contacts are to being mixed gas, so the gas that detection unit CLDY is detected is mixed gas.
Simple air mixing machine structure 13 is exactly the container of a closing, and it has two air inlets and a gas outlet；One air inlet enters sample gas, and another air inlet enters carrier gas, and two kinds of gases are mixed in container, and enters gas mixing pipe road 14 through gas outlet.
7. ejector SLQ is the part of a without motion part, it can for a long time, work to highly reliable, high temperature resistant.Ejector SLQ contains three ports, is respectively：Active air inlet port, passive air inlet port and air outlet.Ejector SLQ, its active air inlet port enters compressed air and sprayed at a high speed from air outlet, so as to produce negative pressure at the position of passive air inlet port so that the gas outside passive air inlet port is continuously inhaled into, the gas being inhaled into sprays at a high speed in the lump from air outlet again.
In normal work, because the position of passive air inlet port generates negative pressure so that directed flow so occurs in gas：13 → gas mixing pipe road of sample tracheae 2 → air mixing machine structure 14 (probe is in this pipeline) → ejector SLQ passive air inlet port → ejector SLQ air outlet.
8. jet blower SF air inlet sucks atmospheric gas and is compressed from air, compressed gas is sent to the input port of jet gas electric control valve 51；The output port of jet gas electric control valve 51 is connected with ejector SLQ active air inlet port gas circuit.
How much is the compressed gas of the ejector SLQ active air inlet ports of regulation entrance in real time of jet gas electric control valve 51.
When sample gas velocity is equal to flue gas flow rate, jet gas electric control valve 51 keeps current state constant.
When sample gas velocity is less than flue gas flow rate, jet gas electric control valve 51 is progressively opened greatly, until sample gas velocity is equal to flue gas flow rate.
When sample gas velocity is more than flue gas flow rate, jet gas electric control valve 51 progressively opens small, until sample gas velocity is equal to flue gas flow rate.
Jet gas electric control valve 51 is opened big or opens small, the result is that determining the compressed gas size into ejector SLQ active air inlet ports, and then determines the vacuum magnitude near the passive air inlet ports of ejector SLQ.If the negative pressure near the passive air inlet ports of ejector SLQ becomes big, mixed gas flow velocity, flow become big, cause sample gas velocity, flow to become big, and the flow velocity of diluent gas, flow are basically unchanged., whereas if the negative pressure near the passive air inlet ports of ejector SLQ diminishes, then mixed gas flow velocity, flow diminish, and cause sample gas velocity, flow to diminish, and the flow velocity of diluent gas, flow are basically unchanged.
Jet gas electric control valve 51 is opened big or opens small, and its order is sent by automation control circuit, and is sent to the terminals of jet gas electric control valve 51, so as to allow jet gas electric control valve 51 to perform.
9. automation control circuit, its type can select the circuit of the intelligent parts containing CPU.
10. the flue gas flow rate in flue gas exhausting pipe line, is measured by the first flow velocity testing agency 15 and reports control circuit.
11. sample gas velocity, carrier gas flow velocity and gaseous mixture flow velocity, the flow velocity of the three are measured by second flow speed testing agency and report control circuit.
Sample gas velocity, carrier gas flow velocity and gaseous mixture flow velocity, for three foregoing flow velocitys, as long as after second flow speed testing agency measures to any two flow velocity therein, it is possible to learn the flow velocity of remaining person, be described as follows.
A. after a kind of gas flow rate is learnt, the flow of its unit interval just can be learnt, its formula is：Sectional area × flow velocity at the flow of unit interval=measurement flow velocity.
Conversely, after a kind of gas flows per unit time is learnt, can also calculate its flow velocity, formula is：Sectional area at the flow ÷ measurement flows of flow velocity=unit interval.
B. sample gas flows per unit time, carrier gas flows per unit time, gaseous mixture flows per unit time, the relation of three flows per unit times is：Sample gas flows per unit time+carrier gas flows per unit time=gaseous mixture flows per unit time.So, in three flows per unit times, as long as measuring any two flows per unit time therein, it just can calculate surplus next flows per unit time.
C. sample gas, carrier gas, gaseous mixture, learn it is any both flow velocity or flows per unit time after, then being left the flow velocity and flows per unit time of person can calculate and obtain.
12. theoretically, the flue gas in flue gas exhausting pipe line, although its flow velocity is constantly in change, but for the flue gas exhausting pipe line in an actual motion, under normal working condition, its change in flow is also within limits；We can be by empirical data, and either the normalized number evidence by measured data or by designing and producing, learns flue gas velocity data during normal operation.Flue gas velocity data includes：Value Data in the middle of flue gas flow rate, flue gas flow rate highest Value Data, the minimum Value Data of flue gas flow rate.
When device is designed and is manufactured experimently, we can be corresponding that the aperture of jet gas electric control valve 51 is arranged in into position placed in the middle based on Value Data in the middle of flue gas flow rate, and primarily determines that the mixed proportion of sample gas and carrier gas.Jet gas electric control valve 51 is opened at middle position, the purpose is to：It is easy to the jet throughput of output to tune up or turn down, can be with bidirectional modulation；Otherwise, if opening the extreme position in a direction, can only unidirectionally it have adjusted.
Assuming that there is following situation, we are followed by deployment analysis.
Assuming that as follows：
When initial, flue gas flow rate is that sample gas velocity in middle Value Data, sample tracheae 2 is identical with flue gas flow rate in flue gas exhausting pipe line, and the flows per unit time of sample gas is A；Jet gas electric control valve 51 is opened in middle part, and now carrier gas flows per unit time is B, and A is equal to 1 to 3 than B, i.e., in gaseous mixture, sample gas account for 25%, and carrier gas account for 75%.If the result detected to mixture strength is 1 concentration unit, this is concentration data after dilution；Then the sample gas actual concentration before conversion dilution is：1 concentration unit ÷ 0.25=4 concentration unit, the i.e. actual concentration of sample gas and flue gas are 4 concentration units.
Deployment analysis is as follows：
When flue gas flow rate becomes big in flue gas exhausting pipe line, i.e. moment occurs：Flue gas flow rate is more than the sample gas velocity in sample tracheae 2 in flue gas exhausting pipe line；After control circuit is got the information, the aperture of order jet gas electric control valve 51 is become larger, to improve jet throughput, improve the compression gas flow for entering ejector SLQ active air inlet ports, so as to cause the negative pressure near the passive air inlet ports of ejector SLQ to raise, mixed gas flow velocity is improved, sample gas velocity is improved, until sample gas velocity and flue gas flow rate are equal.
Another situation is that when flue gas flow rate diminishes in flue gas exhausting pipe line, i.e. moment occurs：Flue gas flow rate is less than the sample gas velocity in sample tracheae 2 in flue gas exhausting pipe line, after control circuit is got the information, the aperture of order jet gas electric control valve 51 is diminished, so as to cause the sample gas flows per unit time in sample tracheae 2 to reduce, i.e. flow velocity is reduced, until the sample gas velocity in sample tracheae 2 is identical with flue gas flow rate in flue gas exhausting pipe line.
Continue to be analyzed as follows.
When flue gas flow rate reaches high Value Data in flue gas exhausting pipe line, sample gas velocity, flow in sample tracheae 2, which are also tracked, reaches high Value Data, it is assumed that：Sample gas flows per unit time rises to 1.5A by original 1A, and the flow of carrier gas is constant, remain unchanged equivalent to 3A.
So, in gaseous mixture, sample gas accounts for percentage and is：1.5A ÷ (1.5A+3A) × %=33.3333%, then carrier gas accounting drops to 66.6666% by 75%, and the accounting of sample gas rises to 33.3333% by 25%.
In calculating formula above, (1.5A+3A) is the flow of gaseous mixture, and 3A therein is the flow of carrier gas, and the flow is held essentially constant；1.5A is sample throughput, and it rises to 1.5A from 1A.
In addition, if being X concentration unit to mixture strength testing result, then being converted into the actual concentration of sample gas should be：X concentration unit ÷ 0.33333=3X concentration unit, the i.e. actual concentration of sample gas and flue gas are 3X concentration unit.
Mixture strength, its numerical values recited is influenceed by sample gas accounting, such as, in mixed gas, and sample gas and carrier gas respectively account for 50%, then the actual concentration value of sample gas=mixture strength value ÷ 0.5.Further, for the sample gas of same concentration, sample gas accounting is higher, then gaseous mixture concentration value is higher；Conversely, sample gas accounting is lower, gaseous mixture concentration value is lower.But, for the sample gas of same concentration, no matter mixed proportion is high or low, the actual concentration after it converts is identical.So, for control circuit and detection unit CLDY, the detection data that they finally show and recorded preferably both are the actual concentration data after conversion；Whether preserved as the concentration Value Data of gaseous mixture, can optionally with depending on needs.Certainly, for from principle, control circuit and detection unit CLDY can also show and record the mixture strength data before conversion, but this carrys out inconvenience to observe and recording grandfather tape, so inventor advises：Display and the detection data of record, preferably the actual concentration data after conversion.There is a method in which also fine, the final detection data for showing and recording, the concentration Value Data of gaseous mixture before existing conversion, also there are the actual concentration data after conversion, switched by the switch (or keyboard) on display screen, both it can be seen that conversion after actual concentration data, can also switch see conversion before gaseous mixture concentration Value Data.
13. for the part (mechanism) detected to gas flow rate, its most typical situation is：By a pair of in differential pressure pickup probes, in the air flue (gas circuit, tracheae) that gas passes through, one be arranged on before, one be arranged on after, converse flow speed value from two gas pressure differences found out.Differential pressure pickup can buy ready-made product, and Selective type, model, specification are suitable.
14. in technical scheme, " described specific gas flow velocity refers to three：Sample gas velocity, carrier gas flow velocity and gaseous mixture flow velocity, described progress detection is directly to be detected, or described progress detection is to carry out directly detection plus indirect detection ", make description below and explanation to this.
A. sample gas velocity, carrier gas flow velocity and gaseous mixture flow velocity, all can directly be detected to the flow velocity of foregoing three, and its benefit is that data record is calculated directly, conveniently and reliably, and also straightforward to operator, and debugging, maintenance are convenient；In addition, if a certain detection parts go wrong, such as detection data are incorrect, and automation control circuit also, so as to alarm or be alarmed by sound on a display screen, can allow operator to immediately know that by learning there is problem rapidly after calculating.Certainly, the flow velocity of three, which all carries out directly detection, needs more circuit configurations.
B. sample gas velocity, carrier gas flow velocity and gaseous mixture flow velocity, can also be direct detection plus indirect detection for foregoing three's flow velocity, such as following first, second, the third three kinds of situations：
First situation.Sample gas velocity and carrier gas flow velocity are directly detected, and gaseous mixture flow velocity can obtain indirect detection result by calculating；First situation is not detected directly to gaseous mixture flow velocity.
Second situation.Sample gas velocity and gaseous mixture flow velocity are directly detected, and carrier gas flow velocity can obtain indirect detection result by calculating；Second situation is not detected directly to carrier gas flow velocity.
Third situation.Carrier gas flow velocity and gaseous mixture flow velocity are directly detected, and sample gas velocity can obtain indirect detection result by calculating；Third situation is not detected directly to sample gas velocity.
Above-mentioned b direct detection adds indirect detection, and above-mentioned a whole is directly detected that both a, b advantage and disadvantage contrast, i.e. a advantage are exactly b deficiency, and b advantage exactly a deficiency.B advantage is that circuit configuration is simple, and its deficiency is：Some data need to calculate, it has not been convenient to, reliability it is low, if there is mistake, automation control circuit is also not easy self-inspection discovery；Deficiency also is：Also not straightforward enough to operator, debugging, maintenance are inconvenient.
15. the terminals of the first flow velocity testing agency 15, the terminals of second flow speed testing agency, they are electrically connected with automation control circuit, in this way, then automation control circuit just knows the flow condition detected by flow rate detection mechanism.
16. pair sample gas is diluted, with the good effect for reducing condensing drip or condensation acid droplet.
Embodiment one
Facilities in the present embodiment are as shown in Figure 4.
In the present embodiment, second flow speed testing agency includes three detection parts, and they are respectively：The carrier gas flow velocity detection part 16 set at the sample gas velocity detection part 18 set at sample tracheae 2, the fast detection part 19 of mixed air-flow set at gas mixing pipe road 14, and gas channels between the output interface of carrier gas regulating valve 52 and air mixing machine structure 13.
After the completion of items debugging, under daily working condition, the aperture of carrier gas regulating valve 52 no longer changes, so diluent gas flow velocity, flows per unit time that carrier gas regulating valve 52 comes out keep being basically unchanged.
Improve flow velocity, the flow of sample gas, just drive large stream gas electric control valve 51, so that the compressed gas into ejector SLQ active air inlet ports increases, so as to cause the negative pressure near the passive air inlet ports of ejector SLQ to rise, cause mixed gas flow velocity, flow to become big, finally realize that the flow velocity of sample gas, flow become big.In foregoing change, mixed gas flow velocity, flow become big, and flow velocity, the flow of sample gas also become big, and the flow velocity of diluent gas, flow are basically unchanged.
It is opposite with above-mentioned situation, if reducing the flow velocity of sample gas, flow, just drive small jet gas electric control valve 51, so that the compressed gas into ejector SLQ active air inlet ports is reduced, so as to cause the negative pressure near the passive air inlet ports of ejector SLQ to decline, cause mixed gas flow velocity, flow to diminish, finally realize that the flow velocity of sample gas, flow diminish.In foregoing change, mixed gas flow velocity, flow diminish, and flow velocity, the flow of sample gas also diminish, and the flow velocity of diluent gas, flow are basically unchanged.
In the present embodiment, the first flow velocity testing agency 15 detects to flue gas flow rate in flue gas exhausting pipe line 5 and reported to automation control circuit；The sample gas velocity detection part 18 of second flow speed testing agency is detected to the sample gas velocity in sample tracheae 2 and reported to automation control circuit.
Know after flue gas flow rate and sample gas velocity, automation control circuit is compared to flue gas flow rate and sample gas velocity, and point following three kinds of situations processing.
The first situation, if sample gas velocity and flue gas flow rate are very very close to and in the error range of permission, then the state that jet gas electric control valve 51 keeps current is constant.
Second of situation, if sample gas velocity is more than flue gas flow rate, the error range of the differences of both flow velocitys beyond permission, then the aperture of automation control circuit order jet gas electric control valve 51 diminishes, mixed gas flow velocity diminishes, the reduction of sample gas velocity, until sample gas velocity and flue gas flow rate are convergent.
The third situation, if sample gas velocity is less than flue gas flow rate, the error range of the differences of both flow velocitys beyond permission, then the aperture of automation control circuit order jet gas electric control valve 51 becomes big, mixed gas flow velocity becomes big, and sample gas velocity accelerates, until sample gas velocity and flue gas flow rate are convergent.
Although the flue gas flow rate in flue gas exhausting pipe line 5 is constantly changing, by the different disposal of three cases above, sample gas velocity and flue gas flow rate can be caused to be consistent.
Because automation control circuit is all known carrier gas flow velocity, sample gas velocity and gaseous mixture flow velocity, so the accounting of the accounting, sample gas gas to the diluent gas in mixed gas is also all to grasp.Automation control circuit can very easily converse the sample gas concentration before dilution after current mixture strength Value Data is obtained.It is important that：Because sample gas velocity is consistent with flue gas flow rate, sample gas concentration truly reflects flue gas concentration, so apparatus of the present invention can detect the concentration of flue gas in real time, exactly.
Embodiment two
Facilities in the present embodiment are as shown in Figure 5.
In the present embodiment, sample gas velocity detection part 18, and the fast detection part 19 of setting mixed air-flow at gas mixing pipe road 14 are set at sample tracheae 2.
Receive after the Monitoring Data that sample gas velocity detection part 18 and the fast detection part 19 of mixed air-flow are sent, automation control circuit can obtain the data such as carrier gas flow velocity, carrier gas flow by calculating.
Embodiment three
Facilities in the present embodiment are as shown in Figure 6.
In the present embodiment, sample gas velocity detection part 18 is provided with sample tracheae 2, and be provided with carrier gas flow velocity detection part 16 at the gas channels between the output interface of carrier gas regulating valve 52 and air mixing machine structure 13.
Receive after the Monitoring Data that sample gas velocity detection part 18 and carrier gas flow velocity detection part 16 are sent, automation control circuit can obtain the data such as gaseous mixture flow velocity, mixed gas flow by calculating.
Example IV
Facilities in the present embodiment are as shown in Figure 7.
In the present embodiment, the fast detection part 19 of mixed air-flow is set at gas mixing pipe road 14, and carrier gas flow velocity detection part 16 is set at the gas channels between the output interface of carrier gas regulating valve 52 and air mixing machine structure 13.
Receive after the Monitoring Data that carrier gas flow velocity detection part 16 and the fast detection part 19 of mixed air-flow are sent, automation control circuit can obtain the data such as sample gas velocity, sample throughput by calculating.
Embodiment five
Referring to Fig. 8.
Invention device in the present embodiment includes：Sample gas Heat preservation part 31.
Automation control circuit includes power circuit；After sample gas Heat preservation part 31 and power circuit are connected, obtain electric energy and produce heat energy so that the sample gas in sample tracheae 2 keeps original higher temperature state and do not declined substantially.
Sample gas Heat preservation part 31 can be designed as lasting energization, in such cases, and the electric energy that sample gas Heat preservation part 31 consumes is smaller, and continuous be powered also is not in too high temperature；Sample gas Heat preservation part 31 may be designed in interrupted energization, and when the temperature that sample gas Heat preservation part 31 is produced reaches high level, automation control circuit order is cut off the electricity supply, is no longer heat up；And when dropping to a certain temperature value at a temperature of sample gas Heat preservation part 31, automation control circuit order switches on power, restarts heating.
Sample gas Heat preservation part 31 heats connect power circuit, can use electric network source, such as 220V, 380V power supply；For the sake of security, the low-voltage AC or direct current of the safety such as 36V or 24V can also be used.
Explanation：If sample gas temperature drop, a problem that easily producing condensing drip or condensation acid droplet.
Embodiment six
Referring to Fig. 9.
Invention device in the present embodiment includes：Carrier gas heater block 32.Carrier gas blower fan XF gas outlet is connected with the input interface of carrier gas regulating valve 52 by diluting heating connecting tube；Described carrier gas heater block 32, it is arranged at dilution heating connecting tube, and its terminals is electrically connected with automation control circuit.
Automation control circuit includes power circuit；After carrier gas heater block 32 and power circuit are connected, obtain electric energy and produce heat energy so that diluent gas temperature is improved, and with flue gas, the temperature of sample gas is approached, so that a problem that avoiding producing condensing drip or condensing acid droplet.
Carrier gas heater block 32 can be designed as lasting energization, in such cases, and the electric energy that carrier gas heater block 32 consumes is smaller, and continuous be powered also is not in too high temperature；Carrier gas heater block 32 may be designed in interrupted energization, and when the temperature that carrier gas heater block 32 is produced reaches high level, automation control circuit order is cut off the electricity supply, is no longer heat up；And when dropping to a certain temperature value at a temperature of carrier gas heater block 32, automation control circuit order switches on power, restarts heating.
Carrier gas heater block 32 heats connect power circuit, can use electric network source, such as 220V, 380V power supply；For the sake of security, the low-voltage AC or direct current of the safety such as 36V or 24V can also be used.
Embodiment seven
Referring to Figure 10.
Invention device in the present embodiment includes：Jet gas heater block 33.The output port of jet gas electric control valve 51 is connected with ejector SLQ active air inlet port by jet heating tube；Described jet gas heater block 33, it is arranged at jet heating tube, and its terminals is electrically connected with automation control circuit；Described automation control circuit includes power circuit.
Automation control circuit includes power circuit；After jet gas heater block 33 and power circuit are connected, obtain electric energy and produce heat energy, finally so that being improved into the temperature of the compressed gas of ejector SLQ active air inlet ports, and approached with the temperature of flue gas, sample gas, so that a problem that avoiding producing condensing drip or condensing acid droplet.
Jet gas heater block 33 can be designed as lasting energization, in such cases, and the electric energy that jet gas heater block 33 consumes is smaller, and continuous be powered also is not in too high temperature；Jet gas heater block 33 may be designed in interrupted energization, and when the temperature that jet gas heater block 33 is produced reaches high level, automation control circuit order is cut off the electricity supply, is no longer heat up；And when dropping to a certain temperature value at a temperature of jet gas heater block 33, automation control circuit order switches on power, restarts heating.
Jet gas heater block 33 heats connect power circuit, can use electric network source, such as 220V, 380V power supply；For the sake of security, the low-voltage AC or direct current of the safety such as 36V or 24V can also be used.
Embodiment eight
Detection means worked after a period of time, often throughout occurs and accumulates some dust, and influence device is normal, reliable, correctly work.Routine techniques use cleaning measure be：Detection means is stopped, artificial unloading's related components, and carries out cleaning manually, and recovery is finally manually ressembled again, work is then proceeded to.
For above-mentioned cleaning, the present embodiment invention device is using full-automatic technology, and speed is fast, and the time is short, it is not necessary to staff's hand labour, also makes device more reliable and more stable.
Illustrated with reference to Figure 11, Figure 12, Figure 13 and Figure 14.
The invention device of the present embodiment includes：Blowback cleaning mechanism.
Blowback cleaning mechanism includes：Electric T-shaped valve STF and blowback magnetic valve FCF；Electric T-shaped valve STF contains first interface S1, second interface S2 and the 3rd interface S3；Blowback magnetic valve FCF contains input interface and output interface.Gas mixing pipe road 14 includes anterior pipeline and rear portion pipeline；Air mixing machine structure 13, the anterior pipeline of gas mixing pipe road, electric T-shaped valve STF first interface S1, three's order gas circuit connection；Electric T-shaped valve STF second interface S2, the rear portion pipeline of gas mixing pipe road, ejector SLQ passive air inlet port, the connection of this three's order gas circuit；Electric T-shaped valve STF the 3rd interface S3 is connected by tracheae with the output end gas circuit of jet gas electric control valve 51.Blowback magnetic valve FCF, its input interface is connected with the input interface gas circuit of carrier gas regulating valve 52, and its output interface is connected with the rear portion pipeline gas circuit of gas mixing pipe road.Electric T-shaped valve STF terminals are electrically connected with automation control circuit；Blowback magnetic valve FCF terminals are electrically connected with automation control circuit.Detection unit CLDY probe is arranged at the rear portion pipeline of gas mixing pipe road.
The hardware case of blowback cleaning mechanism described above, is understood referring to Figure 11.Below, related working condition and operation principle are introduced.
Figure 11 expresses device when being in detection work, the trend of each air-flow, and each small arrow represents the direction of travel of position air-flow.In this Figure 11, first point it should be noted that blowback magnetic valve FCF closes cut-out (i.e. obstructed)；Second point is it should be noted that electric T-shaped valve STF first interface S1 and second interface S2 are led directly to, and the 3rd interface S3 closes cut-out (i.e. obstructed).3rd interface S3 closes cut-out and meant：3rd interface S3 is not only blocked with first interface S1 but also blocked with second interface S2.Figure 12 is the equivalent schematic drawing of Figure 11 gas circuit walking situation.Understood in addition, comparing Figure 12 and Fig. 4, each air-flow walking situation in two figures duplicates, and both working conditions also duplicate.
Figure 13 is to express device to be in blowback when cleaning, the trend of relevant gas flow, and each small arrow represents the direction of travel of position air-flow.Figure 14 is the equivalent schematic drawing of Figure 13 gas circuit walking situation.
When cleaning is needed, detection work is temporarily ceased, and device enters cleaning state.
When cleaning starts, control circuit sends instruction：Blowback magnetic valve FCF is acted, electric T-shaped valve STF actions.In the cleaning condition, blocked between electric T-shaped valve STF first interface S1 and second interface S2；And the 3rd interface S3 and first interface S1 is connected, blocked between the 3rd interface S3 and second interface S2.Under clean conditions, gas circuit is connected between blowback magnetic valve FCF input interface and output interface.Under clean conditions, the gas that carrier gas regulating valve 52 comes, the gas that electric T-shaped valve STF first interface S1 comes, two strands of gases enter after mixed gas bucket 3, then by sample tracheae 2, are discharged to flue gas exhausting pipe line 5 so that dust is removed；If the left end of sample tracheae 2 is also equipped with filtering head, then the dust on filtering head is set to have obtained effective removing.Under clean conditions, the gas that blowback magnetic valve FCF output interfaces come, its powerful position by where probe is removed the dust on probe.
After the completion of cleaning operation, control circuit sends instruction again：Blowback magnetic valve FCF and electric T-shaped valve STF restore to the original state, and device proceeds original detection work.
Detect that work and cleaning operation alternate cycles are carried out, wherein the detection working time is relatively long, and the cleaning operation time is relatively very brief.
Embodiment nine
Invention device in the present embodiment includes：Carrier gas heater block 32 and blowback cleaning mechanism.
Illustrated with reference to Figure 15；The small arrow everywhere that device in this figure is in detection state, figure represents the air-flow trend at place.
The operation principle of blowback cleaning mechanism makes a detailed introduction in embodiment eight, no longer repeats herein.
Carrier gas blower fan XF gas outlet is connected with the input interface of carrier gas regulating valve 52 by diluting heating connecting tube；Carrier gas heater block 32 is arranged at dilution heating connecting tube.
Blowback magnetic valve FCF, its input interface is connected with dilution heating connecting tube gas circuit, and its output interface is connected with the rear portion pipeline gas circuit of gas mixing pipe road.
Due to being provided with carrier gas heater block 32, so that the gas temperature that carrier gas blower fan XF comes out is heated and is improved, therefore, no matter device is in detection state or in blowback clean conditions, the appearance for a problem that can avoiding condensing drip or condensation acid droplet.
Embodiment ten
Invention device in the present embodiment includes：Sample gas Heat preservation part 31, carrier gas heater block 32, jet gas heater block 33, and blowback cleaning mechanism.
Illustrated with reference to Figure 16；The small arrow everywhere that device in this figure is in detection state, figure represents the air-flow trend at place.
The operation principle of blowback cleaning mechanism makes a detailed introduction in embodiment eight, no longer repeats herein.
Sample gas Heat preservation part 31 is arranged at sample tracheae 2；Sample gas Heat preservation part 31 can make sample gas continue to original temperature during being walked in sample tracheae 2.
Carrier gas blower fan XF gas outlet is connected with the input interface of carrier gas regulating valve 52 by diluting heating connecting tube；Carrier gas heater block 32 is arranged at dilution heating connecting tube.Due to being provided with carrier gas heater block 32 so that the gas temperature that carrier gas blower fan XF comes out is heated and is improved.
The output port of jet gas electric control valve (51) is connected with the active air inlet port gas circuit of ejector (SLQ) by jet heating tube；Described jet gas heater block (33), it is arranged at jet heating connecting tube.Jet gas heater block 33 causes the compressed gas temperature that jet blower SF comes out to be improved.
Heater block (referring to sample gas Heat preservation part 31, carrier gas heater block 32 and jet gas heater block 33) can not only make the appearance for a problem that device prevents condensing drip or condensation acid droplet in the state of detection at three, and obtain good technique effect；And the appearance for a problem that device prevents condensing drip or condensation acid droplet in blowback clean conditions can be made；Moreover, it is changed into the moment of detection working condition in blowback clean conditions, each position of device keeps the specific condition of high temperature, is not in of short duration low temperature condition, so that the appearance for a problem that having prevented condensing drip or condensation acid droplet completely.
The explanation of above-mentioned low temperature condition.If the air-flow that blowback is purged when cleaning is not heated, the temperature at each position of device can be greatly lowered at the end of blowback is cleaned.
Above-mentioned specific high temperature, refers to the temperature of flue gas in flue gas exhausting pipe line 5, or the temperature close with flue gas.
Sample gas is diluted, the effect with reduction condensing drip or condensation acid droplet, then is superimposed the multiple action effect heated at three, condensing drip or condensation acid droplet can be avoided the occurrence of completely everywhere in device.
Certainly, for departing from the present embodiment, if only setting at one or being heated at two while the dilution of sample gas, it may have preferable technique effect, but than three at heating technique effect it is less better.
Claims (9)
1. a kind of constant speed flue gas sampling detection means, it is characterized in that：Including：Automation control circuit, sample
Tracheae (2), air mixing machine structure (13), gas mixing pipe road (14), the detection unit (CLDY) containing probe is penetrated
Device (SLQ) is flowed, the jet gas electric control valve (51) adjusted in real time to jet throughput size is penetrated
Flow fan (SF), carrier gas blower fan (XF), carrier gas regulating valve (52), to flue gas exhausting pipe line (5)
Interior flue gas flow rate makees the first flow velocity testing agency (15) detected, and specific gas flow velocity is detected
Second flow speed testing agency；Described specific gas flow velocity refers to three：Sample gas velocity, carrier gas flow velocity,
And gaseous mixture flow velocity, described progress detection is directly to be detected, or described progress detection be into
Row directly detection plus indirect detection；Described ejector (SLQ) contains active air inlet port, passive air inlet
Port and air outlet；
One end of sample tracheae (2) is deeply internal to flue gas exhausting pipe line (5), the other end of sample tracheae (2)
Connected with air mixing machine structure (13) gas circuit；Air mixing machine structure (13) and one end gas circuit of gas mixing pipe road (14) connect
Logical, the other end of gas mixing pipe road (14) is connected with the passive air inlet port gas circuit of ejector (SLQ)；
Described carrier gas blower fan (XF), its air inlet and atmosphere；Carrier gas blower fan (XF's) goes out
Gas port is connected with the input interface gas circuit of carrier gas regulating valve (52)；The output of carrier gas regulating valve (52)
Interface is connected with air mixing machine structure (13) gas circuit；
Described jet blower (SF), its air inlet and atmosphere, its gas outlet and jet gas electric adjustable
Save the input port gas circuit connection of valve (51)；The output port and jet of jet gas electric control valve (51)
The active air inlet port gas circuit connection of device (SLQ)；The terminals of jet gas electric control valve (51) with from
Dynamicization control circuit electrical connection；
The probe of detection unit (CLDY) is arranged on the body portion of gas mixing pipe road (14)；
First flow velocity testing agency (15), it is arranged in flue gas exhausting pipe line (5), its terminals with it is automatic
Change control circuit electrical connection；
The terminals of second flow speed testing agency are electrically connected with automation control circuit.
2. a kind of constant speed flue gas sampling detection means according to claim 1, it is characterized in that：It is described
Second flow speed testing agency, its setting is as follows：
Sample gas velocity detection part (18) is set at sample tracheae (2) place, set at gas mixing pipe road (14) place
Mixed air-flow speed detection part (19), and in carrier gas regulating valve (52) output interface and air mixing machine structure (13)
Between gas channels at set carrier gas flow velocity detection part (16)；
The fast detection part (19) of sample gas velocity detection part (18), mixed air-flow and carrier gas flow rate detection
Part (16), their terminals are each electrically connected with automation control circuit respectively.
3. a kind of constant speed flue gas sampling detection means according to claim 1, it is characterized in that：It is described
Second flow speed testing agency, it is set to any one in following three：
A. sample gas velocity detection part (18) is set at sample tracheae (2) place, and in gas mixing pipe road (14)
Place sets the fast detection part (19) of mixed air-flow；Sample gas velocity detection part (18) and the fast test section of mixed air-flow
Part (19), their terminals are each electrically connected with automation control circuit respectively；
B. sample gas velocity detection part (18) is set at sample tracheae (2) place, and in carrier gas regulating valve (52)
Carrier gas flow velocity detection part (16) is set at the gas channels between output interface and air mixing machine structure (13)；
Sample gas velocity detection part (18) and carrier gas flow velocity detection part (16), their terminals each divide
Do not electrically connected with automation control circuit；
C., the fast detection part (19) of mixed air-flow is set at gas mixing pipe road (14) place, and in carrier gas regulation
Carrier gas flow velocity test section is set at the gas channels between valve (52) output interface and air mixing machine structure (13)
Part (16)；Mixed air-flow speed detection part (19) and carrier gas flow velocity detection part (16), their wiring
End is each electrically connected with automation control circuit respectively.
4. a kind of constant speed flue gas sampling detection means according to claim 1, it is characterized in that：It is described
Device include：Sample gas Heat preservation part (31), it is arranged on sample tracheae (2) place, its terminals with
Automation control circuit is electrically connected；Described automation control circuit includes power circuit.
5. a kind of constant speed flue gas sampling detection means according to claim 1, it is characterized in that：It is described
Device include：Carrier gas heater block (32)；
The gas outlet of carrier gas blower fan (XF) is added with the input interface of carrier gas regulating valve (52) by dilution
Thermally coupled pipe connection；Described carrier gas heater block (32), it is arranged at dilution heating connecting tube, its
Terminals are electrically connected with automation control circuit；Described automation control circuit includes power circuit.
6. a kind of constant speed flue gas sampling detection means according to claim 1, it is characterized in that：It is described
Device include：Jet gas heater block (33)；
The output port of jet gas electric control valve (51) leads to the active air inlet port of ejector (SLQ)
Cross the connection of jet heating tube；Described jet gas heater block (33), it is arranged at jet heating tube,
Its terminals is electrically connected with automation control circuit；Described automation control circuit includes power circuit.
7. a kind of constant speed flue gas sampling detection means according to claim 1, it is characterized in that：It is described
Device include：Blowback cleaning mechanism；
Described blowback cleaning mechanism includes：Electric T-shaped valve (STF) and blowback magnetic valve (FCF)；Electricity
Dynamic triple valve (STF) contains first interface (S1), second interface (S2) and the 3rd interface (S3)；Instead
Blow magnetic valve (FCF) and contain input interface and output interface；
Described gas mixing pipe road (14) includes anterior pipeline and rear portion pipeline；Air mixing machine structure (13), mixes gas
The anterior pipeline of pipeline, the first interface (S1) of electric T-shaped valve (STF), three's order gas circuit connection；
The second interface (S2) of electric T-shaped valve (STF), the rear portion pipeline of gas mixing pipe road, ejector (SLQ)
Passive air inlet port, this three's order gas circuit connection；3rd interface (S3) of electric T-shaped valve (STF)
Connected by tracheae with the output end gas circuit of jet gas electric control valve (51)；
Described blowback magnetic valve (FCF), its input interface and the input interface of carrier gas regulating valve (52)
Gas circuit is connected, and its output interface is connected with the rear portion pipeline gas circuit of gas mixing pipe road；
The terminals of electric T-shaped valve (STF) are electrically connected with automation control circuit；Blowback magnetic valve (FCF)
Terminals electrically connected with automation control circuit；
The probe of detection unit (CLDY) is arranged at the rear portion pipeline of gas mixing pipe road.
8. a kind of constant speed flue gas sampling detection means according to claim 1, it is characterized in that：It is described
Device include：Carrier gas heater block (32) and blowback cleaning mechanism；
The gas outlet of carrier gas blower fan (XF) is added with the input interface of carrier gas regulating valve (52) by dilution
Thermally coupled pipe connection；Described carrier gas heater block (32), it is arranged at dilution heating connecting tube；
Described blowback cleaning mechanism includes：Electric T-shaped valve (STF) and blowback magnetic valve (FCF)；Electricity
Dynamic triple valve (STF) contains first interface (S1), second interface (S2) and the 3rd interface (S3)；Instead
Blow magnetic valve (FCF) and contain input interface and output interface；
Described gas mixing pipe road (14) includes anterior pipeline and rear portion pipeline；Air mixing machine structure (13), mixes gas
The anterior pipeline of pipeline, the first interface (S1) of electric T-shaped valve (STF), three's order gas circuit connection；
The second interface (S2) of electric T-shaped valve (STF), the rear portion pipeline of gas mixing pipe road, ejector (SLQ)
Passive air inlet port, this three's order gas circuit connection；3rd interface (S3) of electric T-shaped valve (STF)
Connected by tracheae with the output end gas circuit of jet gas electric control valve (51)；
Described blowback magnetic valve (FCF), its input interface is connected with dilution heating connecting tube gas circuit, and its is defeated
Outgoing interface is connected with the rear portion pipeline gas circuit of gas mixing pipe road；
The terminals of carrier gas heater block (32) are electrically connected with automation control circuit；Electric T-shaped valve
(STF) terminals are electrically connected with automation control circuit；The terminals of blowback magnetic valve (FCF) with from
Dynamicization control circuit electrical connection；Described automation control circuit includes power circuit；
The probe of detection unit (CLDY) is arranged at the rear portion pipeline of gas mixing pipe road.
9. a kind of constant speed flue gas sampling detection means according to claim 1, it is characterized in that：It is described
Device include：Sample gas Heat preservation part (31), carrier gas heater block (32), jet gas heater block
, and blowback cleaning mechanism (33)；
Described sample gas Heat preservation part (31), it is arranged on sample tracheae (2) place；
The gas outlet of carrier gas blower fan (XF) is added with the input interface of carrier gas regulating valve (52) by dilution
Thermally coupled pipe connection；Described carrier gas heater block (32), it is arranged at dilution heating connecting tube；
The output port of jet gas electric control valve (51) leads to the active air inlet port of ejector (SLQ)
Cross the connection of jet heating tube；Described jet gas heater block (33), it is arranged on jet heating connecting tube
Place；
Described blowback cleaning mechanism includes：Electric T-shaped valve (STF) and blowback magnetic valve (FCF)；Electricity
Dynamic triple valve (STF) contains first interface (S1), second interface (S2) and the 3rd interface (S3)；Instead
Blow magnetic valve (FCF) and contain input interface and output interface；
Described gas mixing pipe road (14) includes anterior pipeline and rear portion pipeline；Air mixing machine structure (13), mixes gas
The anterior pipeline of pipeline, the first interface (S1) of electric T-shaped valve (STF), three's order gas circuit connection；
The second interface (S2) of electric T-shaped valve (STF), the rear portion pipeline of gas mixing pipe road, ejector (SLQ)
Passive air inlet port, this three's order gas circuit connection；3rd interface (S3) of electric T-shaped valve (STF)
Connecting tube gas circuit is heated by tracheae and jet to connect；
Described blowback magnetic valve (FCF), its input interface is connected with dilution heating connecting tube gas circuit, and its is defeated
Outgoing interface is connected with the rear portion pipeline gas circuit of gas mixing pipe road；
The probe of detection unit (CLDY) is arranged at the rear portion pipeline of gas mixing pipe road；
The terminals of sample gas Heat preservation part (31) are electrically connected with automation control circuit；Carrier gas heating part
The terminals of part (32) are electrically connected with automation control circuit；The terminals of jet gas heater block (33) with
Automation control circuit is electrically connected；The terminals of electric T-shaped valve (STF) are electrically connected with automation control circuit
Connect；The terminals of blowback magnetic valve (FCF) are electrically connected with automation control circuit；Described automation control
Circuit processed includes power circuit.
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| CN201610190320.7A CN107238518A (en) | 2016-03-29 | 2016-03-29 | A kind of constant speed flue gas sampling detection means |
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| CN201610190320.7A CN107238518A (en) | 2016-03-29 | 2016-03-29 | A kind of constant speed flue gas sampling detection means |
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| CN112577789A (en) * | 2020-12-07 | 2021-03-30 | 南京波瑞自动化科技有限公司 | Dilution and jet flow two-in-one constant-speed sampling device |
| CN114199808A (en) * | 2020-09-17 | 2022-03-18 | 北京乐氏联创科技有限公司 | Sampling method for VOCs with high dilution ratio |
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