CN204422376U - A kind of novel low-concentration flue gas detection system of particles - Google Patents

A kind of novel low-concentration flue gas detection system of particles Download PDF

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CN204422376U
CN204422376U CN201520090740.9U CN201520090740U CN204422376U CN 204422376 U CN204422376 U CN 204422376U CN 201520090740 U CN201520090740 U CN 201520090740U CN 204422376 U CN204422376 U CN 204422376U
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communicated
jet
stopple coupon
gas
flue gas
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徐颖
梅健
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Shanghai North Branch Polytron Technologies Inc
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SHANGHAI BAIF INSTRUMENT TECHNOLOGY DEVELOPMENT Co Ltd
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Abstract

The utility model relates to gas detection technology field, discloses a kind of novel low-concentration flue gas detection system of particles.In order to solve low concentration multiple spot test problems, propose following technical scheme.It is characterized in that: the probe (37) of light-collecting lens (36) and sensor, they are positioned at measuring cell (34), and their normal overlaps, their normal and the angle of laser beam (33-1) in 45° angle degree; Sampling mechanism (1) comprising: remittance tracheae (13), and the sampling sub-agencies of more than three; Each sampling sub-agencies includes: stopple coupon (2), regulate the miniature electric variable valve (WT) of stopple coupon (2) interior air-flow size, and measure the little differential pressure sensor (WCY) of stopple coupon (2) interior air flow rate; The rear end of each stopple coupon (2) is all communicated with remittance tracheae (13) gas circuit; The front end of gross sample pipe (2) is all arranged in the flue (5) of fume emission, and the front end of each stopple coupon (2) is positioned at diverse location.Beneficial effect is: accuracy of detection is high.

Description

A kind of novel low-concentration flue gas detection system of particles
Technical field
The utility model relates to the technical field of gas sample, determination and analysis, particularly relates to a kind of novel low-concentration flue gas detection system of particles.
Background technology
The flue gas that fuel-burning power plant produces is discharged by flue; In order to objects such as environmental protection, need to fall dirty process to flue gas before being discharged into air, then also will detect (monitoring) the flue gas of discharge.
Through falling the flue gas of dirty process, the particle concentration contained by it reduces greatly, becomes the flue gas of low concentration.Because concentration is low, so bring new difficulty and challenge to the mode detected, method.
The technology of existing detection flue gas particle substrate concentration, as blackness method, nephelometry, charge method, β rays method, and the technical method such as piezoelectric shock method, they also exist the not high enough problem of precision for the flue gas inspection of low concentration.
The check point arranged in flue, the flue diameter at this place usually have several meters big.Suppose: cross check point and do crosscut and form a disk, then the disk area that passes through of flue gas is very large; Flue gas everywhere on this disk, their concentration, composition all can present difference to a certain extent.
At present, due to the restriction of technology, in the flue of each fuel-burning power plant fume emission, all only on a point, obtain sample gas and measure, therefore, the true smoke condition in the result data of measurement and flue, also exists larger difference between the two.
People wish, can overcome technical difficulty, and the low-concentration flue gas carrying out multiple spot detects, to grasp or to approach the truth grasping low-concentration flue gas in flue.
Prior art cannot carry out the detection of low concentration multiple spot in the flue of fume emission; The technical scheme that the utility model proposes, can be implemented in the flue of fume emission and carries out the detection of low concentration multiple spot.
First, the utility model is made the general description, and interpretation.
The utility model overall plan is described below:
A kind of novel low-concentration flue gas detection system of particles, comprising: sampling mechanism 1, negative-pressure pipeline, gas-powered mechanism 35, automation control circuit, and detector; Described detector comprises the sensor detecting flue gas particle substrate concentration; Particularly:
Described system comprises: measuring cell 34, produces the lasing light emitter 33 of laser beam 33-1, and light-collecting lens 36; Laser beam 33-1 is from the opposite side in the side directive measuring cell 34 in measuring cell 34;
The probe 37 of light-collecting lens 36 and sensor, they are positioned at measuring cell 34, and their normal overlaps, and their normal and laser beam 33-1 are the angle of 45° angle degree, the set of their normal forms circular conical surface, the direction that the vertex of a cone of circular conical surface sets out towards laser beam 33-1; Light-collecting lens 36 pops one's head in 37 away from the vertex of a cone close to the vertex of a cone;
Described sampling mechanism 1 comprises: remittance tracheae 13, and multiple sampling sub-agencies; Described multiplely refer to more than three;
Each sampling sub-agencies includes: stopple coupon 2, regulates the miniature electric variable valve WT of air-flow size in stopple coupon 2, and measures the little differential pressure sensor WCY of air flow rate in stopple coupon 2; Miniature electric variable valve WT and automation control circuit electrical connection; Little differential pressure sensor WCY and automation control circuit electrical connection; The rear end of each stopple coupon 2 is all communicated with remittance tracheae 13 gas circuit; The front end of gross sample pipe 2 is all arranged in the flue 5 of fume emission, and the front end of each stopple coupon 2 is positioned at diverse location;
Described negative-pressure pipeline comprises the first negative-pressure pipeline 31 and the second negative-pressure pipeline 32;
The tracheae 13 that converges is communicated with the front end of the first negative-pressure pipeline 31; The rear end of the first negative-pressure pipeline 31 is communicated with the front side of measuring cell 34; The rear side of measuring cell 34 is communicated with the front end of the second negative-pressure pipeline 32; The rear end of the second negative-pressure pipeline 32 is communicated with gas-powered mechanism 35.
The utility model overall plan describes as above; Again the utility model overall plan is explained and explained below.
1. see Fig. 1, Fig. 2, Fig. 3, Figure 20 and Figure 21.
Fig. 1 is one of schematic diagram of the utility model system; Sampling mechanism in figure comprises remittance tracheae and three sampling sub-agencies, and each sampling sub-agencies includes a stopple coupon; The rear end of each stopple coupon is all communicated with remittance tracheae gas circuit; The front end of gross sample pipe is all arranged in the flue of fume emission, and the front end of each stopple coupon is positioned at diverse location; The flue gas that the displacement table be made up of 9 arrows in figure discharges, other each arrow represents the gas flow direction at place place.
Fig. 2 is the partial top view of Fig. 1; Each arrow in figure represents the gas flow direction at place place.
Fig. 3 is the I place partial enlarged drawing in Fig. 1, magnification ratio 4: 1; This figure has also done to analyse and observe process; In figure, the normal of light-collecting lens and the normal of probe overlap, and normal and laser beam are the angle of 45° angle degree; A in figure, represents the angle between normal and laser beam, and its numerical value is 45° angle degree.
Figure 20 is the schematic diagram two of the utility model system; Sampling mechanism in figure comprises: remittance tracheae and three sampling sub-agencies; Each sampling sub-agencies comprises: stopple coupon, miniature electric variable valve and little differential pressure sensor; The flue gas that the displacement table be made up of 9 arrows in figure discharges, other each arrow represents the gas flow direction at place place.
Figure 21 is the vertical view of Figure 20; Each arrow in figure represents the flow direction at place place.
2. gas-powered mechanism 35 intake-gas and produce negative pressure, under the effect of negative pressure, low-concentration flue gas in flue 5 enters three stopple coupons 2 respectively and becomes sample gas, its subsequent rows walks situation: each stopple coupon → enter converges tracheae 13, and collects, mixes → the first negative-pressure pipeline → measuring cell 34 → the second negative-pressure pipelines → gas-powered mechanism 35.
3., when being full of pure air in measuring cell 34, laser beam 33-1 has no to stop the opposite side in ground directive measuring cell 34 from the side in measuring cell 34; When flowing through the flue gas of low concentration in measuring cell 34, the particle in flue gas can affect, block laser beam 33-1, and the particle in flue gas can produce scattered light, and scattered light has all directions character, and the intensity of scattered light is directly proportional to the concentration of particle.
The intensity of scattered light is directly proportional to the concentration of particle.
Further situation is described as follows.
A. the effect of light-collecting lens is focused on by the scattered light received on the photosensitive point of probe, and object makes probe can obtain electric signal large as far as possible.
B. about the normal explanation of probe.With regard to general scientific and technical principle, when light is radiated on photosensitive probe, the change of electric signal will be there is in probe; If rotate probe, then electric signal probe produced there will be size variation, and when the photosensitive point of popping one's head in faces light, the amplitude of electric signal reaches maximum.
The utility model specifies: probe adjustment position and rotational angle, and when there is maximum electric signal, the normal of light-collecting lens and the normal of probe overlap.In addition, in the utility model, normal one word, its implication comprises the extended line of normal and normal thereof.
C. when the normal of light-collecting lens 36 and probe 37 overlaps, and when their normal and laser beam are 45° angle degree angle, its scattered light light intensity obtained is maximum, electrical signal amplitude is maximum.If when deviate from 45° angle degree angle, then departed from more very, scattered light light intensity is less, electrical signal amplitude is lower.
D. meeting normal and laser beam is that the situation of 45° angle degree angle is very many, such as:
Fig. 4 is the variation diagram of Fig. 3; In Fig. 4, from left to right, and in Fig. 3, from right to left, the measuring principle of the utility model forward scattering is constant for laser beam 33-1 for laser beam 33-1.
Fig. 5 is one of the relation schematic diagram of light-collecting lens, probe, laser beam; Compared with Fig. 3, light-collecting lens and probe are changed on laser beam from being positioned under laser beam, and the measuring principle of the utility model forward scattering is constant.
Fig. 6 is the relation schematic diagram two of light-collecting lens, probe, laser beam; In figure 3, laser beam is horizontal light from left to right, and in this Fig. 6, laser beam is oblique light; The measuring principle of the utility model forward scattering is constant.
Normal and laser beam are the situation of 45° angle degree angle, have very many theoretically; The set of normal forms circular conical surface, the direction that the vertex of a cone of circular conical surface sets out towards laser beam; Light-collecting lens is popped one's head in away from the vertex of a cone close to the vertex of a cone, as shown in Figure 7; Triangle in Fig. 7 represents circular conical surface.
The situation of Fig. 3, Fig. 4, Fig. 5, Fig. 6 and Fig. 7, all contain by technical solutions of the utility model.The utility model system adopts the measuring principle of forward scattering, avoid the interference that particle causes reflected incident light or refraction, and optical receiving set (probe) is placed on the direction at most strong scattering angle (45° angle degree), greatly improve detection sensitivity.
In addition, when actual installation, can the probe of sensor be arranged in measuring cell 34, by other circuit of sensor, as amplifying circuit, shaping circuit etc. are placed on outside measuring cell 34, to be popped one's head in by wire and the electrical connection of other circuit, then be electrically connected by the display circuit of wire by other circuit and detector, and be electrically connected with automation control circuit.
4. the method shown in Fig. 8 have employed backward scattered measuring principle, its existing problems are: reflected light, the refract light of particle also can be received by light-collecting lens 36 and focus on probe 37, thus superposed a undesired signal, make electric signal instability, the out of true on probe 37, also reduce detection sensitivity simultaneously.
And the utility model have employed the measuring principle of forward scattering, the reflected light of particle or refract light can not be received by light-collecting lens 36, so avoid interference, make the electric signal on probe 37 stable, accurate, detection sensitivity is high.
5. laser beam good directionality, in the size that measuring cell 34 is so little, ray diameter is considered as unchanged on engineering significance; Theoretical and actual test, shows to use laser technology effect fine.
6., in the utility model, when concrete enforcement, sampling sub-agencies quantity can be three, also can be four, five, or more.
7. in the flue of fume emission, the front end of each stopple coupon 2 is positioned at diverse location, concrete position, needs to determine according to actual conditions; Fig. 5 to Figure 13, in totally 9 width figure, depicts some different situations about arranging, and certainly, this is only the situation of a part, also has other very many facilities, repeats no longer one by one.
8. detector, also can be described as monitor, is the instrument of monitoring exhaust gas components.
In the utility model, detector is also referred to as measuring unit CLDY.Detector comprises detector main body and sensor.Sensor comprises: the circuit such as part, and amplification, shaping of popping one's head in.
From the market or place of manufacturer buy ready-made sensor, choose the product outputing signal and can be detected instrument main body and directly adopt, and choose the product outputing signal and can be automatically controlled circuit and directly adopt, so choose, sensor mass is stable, reliability is high, and significantly can reduce the design of technician, the workload of manufacture.
9. detect the sensor of gas ingredients, the type of this sensor, model and specification, need to adapt with the purposes of flue gas detecting system, function.
If 10. automation control circuit uses the control device containing CPU intelligent parts, good technique effect will be obtained; Such as use industrial computer or single-chip microcomputer or PC application or suitable integrated circuit.
11. special technical measures of the present utility model are as follows:
Each sampling sub-agencies includes: stopple coupon 2, regulates the miniature electric variable valve WT of air-flow size in stopple coupon 2, and measures the little differential pressure sensor WCY of air flow rate in stopple coupon 2; Miniature electric variable valve WT and automation control circuit electrical connection; Little differential pressure sensor WCY and automation control circuit electrical connection; The rear end of each stopple coupon 2 is all communicated with remittance tracheae 13 gas circuit; The front end of gross sample pipe 2 is all arranged in the flue 5 of fume emission, and the front end of each stopple coupon 2 is positioned at diverse location.
For above technical measures, description and interpretation are as follows.
A. be described in conjunction with Figure 20 and Figure 21.
B. to carry out multimetering, such as, 3 measurements be carried out, it is desirable to: be identical from 3 sample entraining air stream amounts obtained, otherwise just can not obtain the mean values parameter of 3, therefore, obtain identical sample entraining air stream amount at each point, this is technological difficulties.
Just think, when carrying out A, B, C 3 and measuring, if normally obtain sample entraining air stream at A point place, and almost nil in the sample entraining air stream amount of other B point and the acquisition of C point, so measurement result is not the flue gas mean values parameter of A, B, C 3.Also have a kind of situation to be, A, B, C of obtaining tri-point sample entraining air stream amount be unequal, then finally can not obtain the flue gas mean values parameter of A, B, C 3.
C. in order to solve the problem, the technical measures that utility model is taked are: the little differential pressure sensor WCY of each sampling sub-agencies containing air flow rate in stopple coupon 2, the miniature electric variable valve WT regulating air-flow size in stopple coupon and measurement stopple coupon.See Figure 20 and Figure 21.
The meaning of abovementioned technology is: little differential pressure sensor WCY sends the differential pressure data in the stopple coupon 2 at place to automation control circuit, and automation control circuit just can know the size of the sample entraining air stream amount in stopple coupon 2.When in stopple coupon, the size of sample entraining air stream amount is in the scope of the permissible error of setting, the aperture size of miniature electric variable valve WT remains unchanged; When in stopple coupon, sample entraining air stream amount is less than setting value, automation control circuit sends instruction, and the aperture of miniature electric variable valve WT becomes large gradually until sample entraining air stream amount meets setting value in stopple coupon; When in stopple coupon, sample entraining air stream amount is greater than setting value, automation control circuit sends instruction, and the aperture of miniature electric variable valve WT diminishes gradually until sample entraining air stream amount meets setting value in stopple coupon.
Known in sum, under the interlock, cooperation of miniature electric variable valve WT, little differential pressure sensor WCY and automation control circuit, the sample entraining air stream amount in each stopple coupon can be made to reach equal and keep equal; Aforementionedly equally refer in the scope of certain precision.
D. gas-powered mechanism draw gas enters air, creates negative pressure therefrom.Sample gas in each stopple coupon, they enter remittance tracheae 13 under the effect of negative pressure; In remittance tracheae 13, the sample gas from each stopple coupon converges and mixes, and then still under the effect of negative pressure, mixed sample gas flows to measuring cell 34 and is detected.
Detect the sensor of flue gas particle substrate concentration, its probe 37 obtains ultra-weak electronic signal, then after amplification, shaping, display circuit can be sent to show, and for operating personnel's observation, can also send automation control circuit record, storage, printing etc.; If relevant telecommunications breath from mechanisms such as tape recording, storage, printings, also can be sent detector by detector itself.
E. the sample airshed entering each stopple coupon of remittance tracheae 13 is equal, so it is arithmetic mean Value Data that detector finally detects, analyzes and calculate the result obtained, the data that these data detect than single-point are more meaningful, more can reflect the truth of flue gas in flue.Generally speaking, sampling sub-agencies is more, i.e. stopple coupon more than 2, then testing result is more close to actual conditions.
More than introduce: the sample airshed entering each stopple coupon 2 of remittance tracheae 13 is equal, so it is arithmetic mean Value Data that detector finally detects, analyzes and calculate the result obtained; The aforementioned calculating counted is also also uncomplicated, so be a kind of Technical arrangements of optimization.But, according to principle of the present utility model, the Technical arrangements of deterioration also can be developed out.The Technical arrangements of deterioration, such as, the sample airshed of three stopple coupons 2 is unequal but keep certain ratio, and thus, finally also obtain the detection data of arithmetic average by the calculating of complexity, the Technical arrangements of this deterioration, make calculating become complicated.A kind of Technical arrangements of deterioration are in addition: the sample airshed of three stopple coupons 2 is unequal, but the sample airshed being considered as three stopple coupons 2 is equal, does not namely do monitoring and the adjustment of flow, so, reduce the representativeness and science that detect data.The utility model does not recommend the Technical arrangements of deterioration.
F. automation control circuit sends instruction, and the aperture of miniature electric variable valve WT diminishes or becomes large, and the specific implementation method performing instruction has a lot.Such as, realized by relay A and relay B: when relay A and relay B all discharges, the aperture of miniature electric variable valve WT keeps current state constant; During relay A adhesive, motor rotates forward, and the aperture of miniature electric variable valve WT changes to augment direction; Motor reversal during relay B adhesive, the aperture of miniature electric variable valve WT is to the change of reduction direction; In addition, relay A and relay B adhesive simultaneously is not allowed.The aforementioned situation being realized automation control circuit instruction by a pair relay, also can be changed into and be realized by a pair controllable silicon or other power device.
Above the utility model overall plan is described and is explained.Below, the further technical scheme of the utility model is explained and explained.
Further technical scheme 1.
Technical scheme describes.Described gas-powered mechanism 35 comprises: jet blower SF, jet variable valve STJF, and ejector SLQ; Described ejector SLQ contains initiatively air inlet port, passive air inlet port and air outlet; Described jet blower SF, its air intake opening is communicated with air, and its gas outlet is communicated with the input port gas circuit of jet variable valve STJF; The output port of jet variable valve STJF is communicated with the active inlet end implication road of ejector SLQ; Described remittance tracheae 13 is airtight containers; The rear end of the second negative-pressure pipeline 34 is communicated with the passive inlet end implication road of ejector SLQ.
The description and interpretation of technical scheme are as follows.
Be described see Figure 22 and understand.
1. the air intake opening of jet blower SF sucks atmospheric gas and compresses from air, and pressure gas is through jet variable valve STJF, the active air inlet port delivering to ejector SLQ again.
2. the effect of jet variable valve STJF comprises: the pressurized air that a. jet blower SF exports, and its air pressure can not ensure it is stable, and the air pressure that jet variable valve STJF exports is stable.B. jet variable valve STJF can regulate the pressure gas number entering ejector SLQ active air inlet port, thus the vacuum magnitude of the passive air inlet port of adjustable ejector SLQ.C. under the acting in conjunction of jet variable valve STJF and sampling mechanism 1, converge tracheae 13 out, the sample entraining air stream entered in negative-pressure pipeline, its size can reach the airshed of needs.
3. ejector SLQ is the parts without moving parts, and it can work long-time, highly reliable, high temperature resistantly.Ejector SLQ contains three ports, respectively: initiatively air inlet port, passive air inlet port and air outlet.Ejector SLQ, its active air inlet port enters pressurized air and sprays at a high speed from air outlet, thus producing negative pressure at the position of passive air inlet port, the gas outside passive air inlet port is inhaled into continuously, and the gas be inhaled into is again from air outlet in the lump ejection at a high speed.
The air outlet of ejector SLQ, its gas of discharging, can directly be discharged in air, also can be sent back in flue 5 (chimney) by pipeline and discharge.
Ejector SLQ in Figure 22, its upper port is active air inlet port, and the port of its left part is passive air inlet port, and the port of its underpart is air outlet.
In normal work, because the position of passive air inlet port creates negative pressure, under the suction of this negative pressure, there is directed flowing in gas: the air outlet of the passive air inlet port → ejector SLQ of multiple stopple coupon 2 (each stopple coupon flow is equal) → remittance tracheae 13 → the first negative-pressure pipeline 31 → measuring cell → the second negative-pressure pipeline 32 → ejector SLQ, is finally entered air or sent back in flue 5 by pipeline.
Further technical scheme 2.
Technical scheme describes.Described gas-powered mechanism 35 comprises: jet heater block 22, water back 21, jet blower SF, jet variable valve STJF, and ejector SLQ; Described ejector SLQ contains initiatively air inlet port, passive air inlet port and air outlet; Described jet heater block 22, it is set to the first situation or it is set to the second situation; The first described situation is: described jet blower SF, and its air intake opening is communicated with air, and its gas outlet is communicated with the input port gas circuit of jet variable valve STJF; The output port of jet variable valve STJF is connected with one end of water back 21, and the body portion of water back 21 is through jet heater block 22, and the other end of water back 21 is communicated with the active inlet end implication road of ejector SLQ; Described the second situation is: described jet blower SF, its air intake opening is communicated with air, its gas outlet is connected with one end of water back 21, and the body portion of water back 21 is through jet heater block 22, and the other end of water back 21 is communicated with the input port gas circuit of jet variable valve STJF; The output port of jet variable valve STJF is communicated with the active inlet end implication road of ejector SLQ; The rear end of the second negative-pressure pipeline 34 is communicated with the passive inlet end implication road of ejector SLQ.
The description and interpretation of technical scheme.
1. discharge the flue of flue gas, the flue-gas temperature in this flue is higher or very high, if this flue gas runs into gas at normal temperature or normal temperature object just there will be condensing drip or solidifying acid droplet, light causes prohibited data detection true, and the heavy detector that makes cannot work.The effect of jet heater block 22 is heated compressed air, avoids ejector SLQ to occur condensing drip or occurs condensation acid droplet etc.
2. the first situation in technical scheme is: pressurized air heats after jet variable valve STJF again; The second situation in technical scheme is: pressurized air first heats, and then is sent to jet variable valve STJF.Obviously, the first better off, can reduce the heatproof requirement of jet variable valve STJF.
The first situation is see Figure 23; The second situation is see Figure 24.
3. jet heater block 22 i.e. heating facility can be electric heating mechanism, also can be the heating arrangements of other types.The body portion of water back 21 is through jet heater block 22, and the pressurized air in water back 21 is heated.
4. in order to strengthen heating effect, improve the temperature of pressure gas, the length of water back 21 can be made to increase, make that the distance that in water back 21, pressure gas flows through is longer, the time is also more, concrete grammar as: water back 21 is manufactured and designed for shape and structure back and forth, or manufactures and designs for helicoidal structure.
If 5. jet heater block 22 uses electrically heated, can also set temperature control gear, make the pressurized air after heating remain in certain temperature range, so, then condensation-resistant water droplet and condensation-resistant acid droplet effect better.
Further technical scheme 3.
Technical scheme describes.Described detection system comprises blowback calibrating device; Described blowback calibrating device comprises: solenoid valve FCF is demarcated in blowback; Described gas-powered mechanism 35 comprises: jet blower SF, jet variable valve STJF, ejector SLQ, and jet connecting pipe; Described ejector SLQ contains initiatively air inlet port, passive air inlet port and air outlet; Described jet blower SF, its air intake opening is communicated with air, and its gas outlet is communicated with the input port gas circuit of jet variable valve STJF; The output port of jet variable valve STJF is communicated with the active inlet end implication road of ejector SLQ by jet connecting pipe; The rear end of the second negative-pressure pipeline 32 is communicated with the passive inlet end implication road of ejector SLQ; Solenoid valve FCF is demarcated in described blowback, and its air inlet port is communicated with jet connecting pipe, and its air outlet is communicated with the body portion of the first negative-pressure pipeline 31, and its terminals are electrically connected with automation control circuit.
The description and interpretation of technical scheme.
After system works a period of time, can occur throughout and accumulate some dust, influential system normally, reliably, correctly works.The clean measure that routine techniques adopts is: system stalls, artificial unloading's related components, and manually carries out cleaning, finally manually ressembles recovery again, then works on.For above-mentioned cleaning, the utility model system adopts full-automatic technology, and speed is fast, and the time is short, does not need staff's hand labour, no longer carries out dismounting frequently thus makes system more reliable and more stable.
In addition, after system works a period of time, also need again to check detector work whether normal, the zero point drift of instrument or sensor? after a period of time that worked, demarcation should be re-started, to guarantee the accuracy of testing.The utility model system also adopts full-automatic technology to demarcate, and speed is fast, and the time is short, does not equally also need staff's hand labour.
Below, be described in conjunction with Figure 25 and Figure 26.
Figure 25 is the trend that have expressed system when being in testing state, each air-flow in the schematic diagram six, figure of the utility model system; The flue gas that the displacement table be made up of 3 arrows in figure discharges, other each arrow represents the gas flow direction at place place; In detail in this figure, blowback is demarcated solenoid valve FCF and is closed cut-out (namely obstructed).
Figure 26 is the trend that have expressed system when being in blowback clean conditions, relevant gas flow in the schematic diagram seven, figure of the utility model system; The flue gas that the displacement table be made up of 3 arrows in figure discharges, other each arrow represents the gas flow direction at place place; In detail in this figure, blowback demarcation solenoid valve FCF opens (namely air-flow can pass through).
Before cleaning action, blowback is demarcated gas circuit between the air inlet port of solenoid valve FCF and air outlet and is blocked, and when system is in normal testing state, its situation as shown in figure 25.
When cleaning is needed, control circuit sends instruction: solenoid valve FCF action is demarcated in blowback; Testing suspends.
During cleaning operation, blowback is demarcated gas circuit between the air inlet port of solenoid valve FCF and air outlet and is connected.The clean pressure gas that solenoid valve FCF output interface is sent is demarcated in blowback, and the position at its powerful inswept probe place, makes the dust on probe be removed; In addition, under the purging of clean air, converge tracheae 13, each stopple coupon 2 and other positions dust be all cleaned.
Cleaning operation is after the regular hour, and such as cleaning operation is after 3 minutes, and clean up task everywhere completes.After clean up task completes, clean pressurized air is only had to pass through in negative-pressure pipeline, this cleaning compressed air is demarcated solenoid valve FCF output interface by blowback and is sent here, so carve at this moment, and can to detector, to the transducer calibration zero point being arranged on negative-pressure pipeline place.
For above situation about introducing, more relevant circuit is arranged below and be illustrated.
1. blowback cleaning operation and Zero calibration, can be designed as full-automation.Such as, it was a work period with two hours; Following a, b, c state is sequentially entered respectively within a work period:
A.0 hour 00 point 00 second to 1 hour 56 points within 00 second, be normal testing state;
B.1 hours 56 points 01 second to 1 hour 59 points within 00 second, be blowback cleaning operation state;
C.1 hours 59 points 01 second to 1 hour 59 points within 59 seconds, be Zero calibration operation, proceed blowback cleaning operation simultaneously.
When two hours at the expiration, system enters the next new cycle, starts a, b, c of a new round; So with two hours for one-period, circulation endlessly carry out full-automatic work.
Realize above Design Conception by software program, hell and high water is not existed for the state of the art.Namely say, Design Conception and mentality of designing creative; And once after Design Conception and mentality of designing produce, use common prior art just can develop software program and realized, there is not technical difficulty.
2. blowback cleaning operation and Zero calibration, also can be designed as manual operation; When manually intervening, system is in normal testing state.Operating personnel can pass through button, system halt testing, enter blowback cleaning operation; In the blowback cleaning operation later stage, manually Zero calibration can be realized by button; Subsequently, manually can pass through button, depart from blowback and clean and demarcate operation, system enters the circulation of a new round, then re-starts testing, etc.
Further technical scheme 4.
Below technical scheme A, technical scheme B and technical scheme C are described in the lump, and explain in the lump and explain.
Technical scheme A describes.Described stopple coupon 2, its front portion has elbow structure; The concrete condition of elbow structure is as follows: the body portion of described stopple coupon 2 is the level of state; The front portion of stopple coupon 2, before this in swelling upward, turns round in circular arc then, last port in downward to; Stopple coupon 2 port towards, the flow direction of tested flue gas, should both arrange in opposite directions in flue 5.
Technical scheme B describes.Described sampling mechanism 1 comprises stand tube 19; The front portion of stand tube 19 and body portion all stretch in flue 5, and the rear portion of stand tube 19 is fixedly connected with walling of flue detachable; Stopple coupon 2 is set in stand tube 19, and both are fixedly connected with; Stopple coupon 2 port towards, the flow direction of tested flue gas, should both arrange in opposite directions in flue.
Technical scheme C describes.Described sampling mechanism 1 comprises: stand tube 19, direction pipe 18, and direction differential pressure pick-up; Described direction differential pressure pick-up, it is arranged on direction pipe 18 place, and its terminals are electrically connected with automation control circuit; Described direction pipe 18 is fixedly connected with stand tube 19; The front portion of stand tube 19 and body portion all stretch in flue 5, and the rear portion of stand tube 19 is connected with walling of flue detachable; Stopple coupon 2 is set in stand tube 19, and both are fixedly connected with; Direction pipe 18 towards with stopple coupon 2 port towards completely the same.
The description and interpretation of technical scheme A, B and C are as follows.
1. prior art Problems existing.
When prior art detects the dust in flue gas, Problems existing has: the dust content detected is less than the content of dust in actual discharge flue gas.
Inventor, through deep research, also finds that the big dust particle content especially detected is less than the content of big dust particle in actual discharge flue gas.
Inventor, through further investigation and experiment, finds: in the sample gas that suction is come in, the dust content contained by it, particularly big dust particle content are lower than the content in actual discharge flue gas in flue 5.
Inventor is through constantly to observe and test, and compared with other compositions in flue gas, diameter and the quality of dust are relatively large, and its inertia is also larger; When air-flow turns to or turns round, the material of other compositions is easily along with flowing motion greatly, and dust, to carry be not oarse-grained dust, because inertia is relatively large, has the tendency keeping original movement locus.
Prior art is not thoroughly understood and is paid attention to principle wherein, does not take corresponding special measure, so a lot of dust, to carry be not that big dust particle not to enter in stopple coupon 2 and unimpeded walking in stopple coupon 2.
2. the solution that the utility model proposes.
A. about technical scheme A.
Described stopple coupon 2, its front portion has elbow structure; The concrete condition of elbow structure is as follows: the body portion of described stopple coupon 2 is the level of state; The front portion of stopple coupon 2, before this in swelling upward, turns round in circular arc then, last port in downward to; Aforementioned description can be understood see Figure 28, and stopple coupon 2 quantity in figure is three.
Stopple coupon 2 port towards, the flow direction of tested flue gas, should both arrange in opposite directions in flue.What Figure 28 drew is flue gas by under upward time situation, this is also typical situation.When flue gas be not by under situation upward, be now explained for following example.
When flue gas by left walk towards right lateral time, stopple coupon 2 port in towards left direction, is understood see Figure 35.When flue gas by right walk towards left lateral time, stopple coupon 2 port in towards right direction, is understood see Figure 36.When flue gas inclined is to when walking upward, stopple coupon 2 port be oblique downward to, understand see Figure 37.
It is important to note that: stopple coupon 2 port towards, the flow direction of tested flue gas, should both arrange in opposite directions in flue; If both are just right, technique effect is best; If both fail just right, then deviation is larger, and technique effect is poorer.Technique effect refers to well: dust, to carry be not that big dust particle to enter in stopple coupon 2 and unimpeded walking in stopple coupon 2 smoothly.
In the utility model, stopple coupon 2 front portion has elbow structure, the dust in flue gas, particularly oarse-grained dust can be made can to enter stopple coupon 2 easily and unimpededly in the walking of stopple coupon 2 inside, both can not enter in the port of stopple coupon 2, also can not block at turning.Review prior art, fail to understand stopple coupon 2 port and the completely just right importance of tested flue gas; Further, the corner of prior art stopple coupon is 90 ° of degree right angles, dust blocking inevitably occurs, piles up, especially for big dust particle, situation more very.
B. about technical scheme B, see Figure 29.
Multiple stopple coupon 2, they are all fixedly connected with stand tube 19; Stand tube 19 can be connected with flue 5 by ring flange, and the direction of gross sample pipe 2 port just can be rotated in the direction of swinging mounting pipe 19, can reach easily to arrange in opposite directions with the flow direction of tested flue gas and completely just right.
C. about technical scheme C, see Figure 30, Figure 31, Figure 32 and Figure 33.Figure 31, Figure 32 and Figure 33 are equivalent to the different left view of Figure 30 tri-, and have done to omit process.
All stopple coupons 2 are fixedly connected with stand tube 19, and the direction of gross sample pipe 2 port just can be rotated in the direction of swinging mounting pipe 19.But, the direction of stopple coupon 2 port and the flow direction of tested flue gas, should both whether arrange completely in opposite directions, completely just right? at the scene, how carrying out judgement is a problem, and for this reason, the solution that utility model proposes is as technical scheme C.
When the flow direction of the completely just right tested flue gas of direction pipe 18, be exactly the flow direction of the completely just right tested flue gas of gross sample pipe 2 port, now, as shown in figure 33, the numerical value that direction differential pressure pick-up obtains is zero or close to zero to situation.
When direction pipe there occurs anticlockwise deflection, as shown in figure 31; Or, when direction pipe there occurs clockwise deflection, as shown in figure 32; When aforementioned two kinds of deflection situations, the numerical value that direction differential pressure pick-up obtains is all non-vanishing.When Figure 31 rotates gradually towards the direction shown in Figure 33, or when Figure 32 rotates gradually towards the direction shown in Figure 33, the numerical value that direction differential pressure pick-up obtains all can diminish gradually; When Figure 33 rotates gradually towards Figure 31 direction, or when Figure 33 rotates gradually towards Figure 32 direction, the numerical value that direction differential pressure pick-up obtains all can become large gradually.
Therefore, operating personnel by the numerical value of direction of observation differential pressure pick-up, just can at the scene by stopple coupon 2 port towards the flow direction with tested flue gas, rotate, be adjusted to both and arrange also completely just right in opposite directions, thus realize best-of-breed technology effect.
Further technical scheme 5.
Technical scheme describes.Described multiple sampling sub-agencies are three sampling sub-agencies, or described multiple sampling sub-agencies are four sampling sub-agencies, or described multiple sampling sub-agencies are five sampling sub-agencies; When three sampling sub-agencies, the front end of its three stopple coupons 2 is rods arranged in horizontal line or the arrangement in isosceles triangle; When four sampling sub-agencies, the front end of its four stopple coupons 2 is rods arranged in horizontal line or rectangular arrangement; When five sampling sub-agencies, the front end of its five stopple coupons 2 is rods arranged in horizontal line or the arrangement in X-shaped.
The description and interpretation of technical scheme.
The front end of five stopple coupons 2 is rods arranged in horizontal line, and Figure 17 is a kind of situation, and Figure 18 is another situation.The front end of five stopple coupons 2 is X-shaped arrangement, see Figure 19.
What Figure 17 showed is a kind of typical situation; The front end arrangement of its five stopple coupons 2, is distributed on flue 5 radial direction, and follows the principle of distance decile.Such as: the radius of tested flue 5 is 3 meters, use 5 stopple coupons, so the front end arranging situation of sample tap is: distance walling of flue 0.6 meter, 1.2 meters, 1.8 meters, 2.4 meters and 3 meters of, be set to five stopple coupon 2 front ends of to five respectively.
The front end of four stopple coupons 2 is rods arranged in horizontal line, and Figure 14 is a kind of situation, and Figure 15 is another situation.The rectangular arrangement in front end of four stopple coupons 2, see Figure 16.
The front end of three stopple coupons 2 is rods arranged in horizontal line, and Figure 11 is a kind of situation, and Figure 12 is another situation.The front end of three stopple coupons 2 is isosceles triangle arrangement, see Figure 13.
Further instruction: the arrangement pattern of stopple coupon 2 front end, except the explanation made in conjunction with drawing above, also has very many methods, as space is limited, repeats no more.
Utility model content
The detection of low concentration multiple spot cannot be carried out in the flue of fume emission to solve, the utility model proposes following technical scheme.
A kind of novel low-concentration flue gas detection system of particles, comprising: sampling mechanism, negative-pressure pipeline, gas-powered mechanism, automation control circuit, and detector; Described detector comprises the sensor detecting flue gas particle substrate concentration;
Described system comprises: measuring cell, produces the lasing light emitter of laser beam, and light-collecting lens; Laser beam is from the opposite side in the side directive measuring cell in measuring cell;
The probe of light-collecting lens and sensor, they are positioned at measuring cell, and their normal overlaps, and their normal and laser beam be the angle of 45° angle degree, the set formation circular conical surface of their normal, the direction that the vertex of a cone of circular conical surface sets out towards laser beam; Light-collecting lens is popped one's head in away from the vertex of a cone close to the vertex of a cone;
Described sampling mechanism comprises: remittance tracheae, and multiple sampling sub-agencies; Described multiplely refer to more than three;
Each sampling sub-agencies includes: stopple coupon, regulates the miniature electric variable valve of air-flow size in stopple coupon, and measures the little differential pressure sensor of air flow rate in stopple coupon; Miniature electric variable valve and automation control circuit electrical connection; Little differential pressure sensor and automation control circuit electrical connection; The rear end of each stopple coupon is all communicated with remittance tracheae gas circuit; The front end of gross sample pipe is all arranged in the flue of fume emission, and the front end of each stopple coupon is positioned at diverse location;
Described negative-pressure pipeline comprises the first negative-pressure pipeline and the second negative-pressure pipeline;
The tracheae that converges is communicated with the front end of the first negative-pressure pipeline; The rear end of the first negative-pressure pipeline is communicated with the front side of measuring cell; The rear side of measuring cell is communicated with the front end of the second negative-pressure pipeline; The rear end of the second negative-pressure pipeline is communicated with gas-powered mechanism.
Described gas-powered mechanism comprises: jet blower, jet variable valve, and ejector; Described ejector contains initiatively air inlet port, passive air inlet port and air outlet; Described jet blower, its air intake opening is communicated with air, and its gas outlet is communicated with the input port gas circuit of jet variable valve; The output port of jet variable valve is communicated with the active inlet end implication road of ejector;
Described remittance tracheae is airtight container;
The rear end of the second negative-pressure pipeline is communicated with the passive inlet end implication road of ejector.
Described gas-powered mechanism comprises: jet heater block, water back, jet blower, jet variable valve, and ejector; Described ejector contains initiatively air inlet port, passive air inlet port and air outlet;
Described jet heater block, it is set to the first situation or it is set to the second situation;
The first described situation is: described jet blower, and its air intake opening is communicated with air, and its gas outlet is communicated with the input port gas circuit of jet variable valve; The output port of jet variable valve is connected with one end of water back, and the body portion of water back is through jet heater block, and the other end of water back is communicated with the active inlet end implication road of ejector;
Described the second situation is: described jet blower, its air intake opening is communicated with air, its gas outlet is connected with one end of water back, and the body portion of water back is through jet heater block, and the other end of water back is communicated with the input port gas circuit of jet variable valve; The output port of jet variable valve is communicated with the active inlet end implication road of ejector;
The rear end of the second negative-pressure pipeline is communicated with the passive inlet end implication road of ejector.
Described detection system comprises blowback calibrating device; Described blowback calibrating device comprises: solenoid valve is demarcated in blowback;
Described gas-powered mechanism comprises: jet blower, jet variable valve, ejector, and jet connecting pipe; Described ejector contains initiatively air inlet port, passive air inlet port and air outlet; Described jet blower, its air intake opening is communicated with air, and its gas outlet is communicated with the input port gas circuit of jet variable valve; The output port of jet variable valve is communicated with the active inlet end implication road of ejector by jet connecting pipe;
The rear end of the second negative-pressure pipeline is communicated with the passive inlet end implication road of ejector;
Solenoid valve is demarcated in described blowback, and its air inlet port is communicated with jet connecting pipe, and its air outlet is communicated with the body portion of the first negative-pressure pipeline, and its terminals are electrically connected with automation control circuit.
Described stopple coupon, its front portion has elbow structure; The concrete condition of elbow structure is as follows:
The body portion of described stopple coupon is the level of state; The front portion of stopple coupon, before this in swelling upward, turns round in circular arc then, last port in downward to;
Stopple coupon port towards, the flow direction of tested flue gas, should both arrange in opposite directions in flue.
Described sampling mechanism comprises stand tube;
Front portion and the body portion of stand tube all stretch in flue, and the rear portion of stand tube is fixedly connected with walling of flue detachable; In stand tube, stopple coupon is set, and both are fixedly connected with;
Stopple coupon port towards, the flow direction of tested flue gas, should both arrange in opposite directions in flue.
Described sampling mechanism comprises: stand tube, and direction is managed, and direction differential pressure pick-up;
Described direction differential pressure pick-up, it is arranged on direction Guan Chu, and its terminals are electrically connected with automation control circuit; Described direction pipe is fixedly connected with stand tube;
Front portion and the body portion of stand tube all stretch in flue, and the rear portion of stand tube is connected with walling of flue detachable; In stand tube, stopple coupon is set, and both are fixedly connected with;
Direction pipe towards with stopple coupon port towards completely the same.
Described system comprises differential pressure pick-up, and it is arranged on the first negative-pressure pipeline place or it is arranged on the second negative-pressure pipeline place, its terminals and automation control circuit electrical connection.
Described multiple sampling sub-agencies are three sampling sub-agencies, or described multiple sampling sub-agencies are four sampling sub-agencies, or described multiple sampling sub-agencies are five sampling sub-agencies;
When three sampling sub-agencies, the front end of its three stopple coupons is rods arranged in horizontal line or the arrangement in isosceles triangle;
When four sampling sub-agencies, the front end of its four stopple coupons is rods arranged in horizontal line or rectangular arrangement;
When five sampling sub-agencies, the front end of its five stopple coupons is rods arranged in horizontal line or the arrangement in X-shaped.
The beneficial effects of the utility model are: can carry out multiple spot, real-time, continuous print detection to low-concentration flue gas particle, testing result can reflect the truth in flue, and accuracy of detection is high.
During dust in utility model systems axiol-ogy flue gas, use the elbow structure of stopple coupon 2 front portion, big or middle particle dust can be made together to flow with flue gas, detect data and truth more identical.
Accompanying drawing explanation
Fig. 1 is one of schematic diagram of the utility model system; Sampling mechanism in figure comprises remittance tracheae and three sampling sub-agencies, and each sampling sub-agencies includes a stopple coupon; The rear end of each stopple coupon is all communicated with remittance tracheae gas circuit; The front end of gross sample pipe is all arranged in the flue of fume emission, and the front end of each stopple coupon is positioned at diverse location; The flue gas that the displacement table be made up of 9 arrows in figure discharges, other each arrow represents the gas flow direction at place place;
Fig. 2 is the partial top view of Fig. 1; Each arrow in figure represents the gas flow direction at place place;
Fig. 3 is the I place partial enlarged drawing in Fig. 1, magnification ratio 4: 1; This figure has also done to analyse and observe process; In figure, the normal of light-collecting lens and the normal of probe overlap, and normal and laser beam are the angle of 45° angle degree; A in figure, represents the angle between normal and laser beam, and its numerical value is 45° angle degree;
Fig. 4 is the variation diagram of Fig. 3;
Fig. 5 is one of the relation schematic diagram of light-collecting lens, probe, laser beam;
Fig. 6 is the relation schematic diagram two of light-collecting lens, probe, laser beam;
Fig. 7 is the relation schematic diagram three of light-collecting lens, probe, laser beam;
Fig. 8 is comparison diagram; Method shown in Fig. 8 have employed backward scattered measuring principle, and its Problems existing is: particle has reflection to incident light or has refraction, thus causes interference, reduces detection sensitivity; Method shown in Fig. 8, its technique effect is not so good as forward scattering of the present utility model and measures;
Fig. 9 is the schematic diagram that Fig. 2 reduces distortion;
Figure 10 is the II place partial enlarged drawing in Fig. 9, magnification ratio 4: 1;
Figure 11 is the front position of three stopple coupons in Fig. 9; Three small circles in Figure 11, which represent port and the position thereof of three stopple coupons in Fig. 9; In fig. 11, the front end of three stopple coupons is rods arranged in horizontal line;
The situation that Figure 12 expresses is: three stopple coupon front ends in three sampling sub-agencies are alternative rods arranged in horizontal line;
The situation that Figure 13 expresses is: three stopple coupon front ends in three sampling sub-agencies are isosceles triangle arrangement;
The situation that Figure 14 expresses is: four stopple coupon front ends in four sampling sub-agencies are rods arranged in horizontal line;
The situation that Figure 15 expresses is: four stopple coupon front ends in four sampling sub-agencies are alternative rods arranged in horizontal line;
The situation that Figure 16 expresses is: four rectangular arrangements in stopple coupon front end in four sampling sub-agencies;
The situation that Figure 17 expresses is: five stopple coupon front ends in five sampling sub-agencies are rods arranged in horizontal line;
The situation that Figure 18 expresses is: five stopple coupon front ends in five sampling sub-agencies are alternative rods arranged in horizontal line;
The situation that Figure 19 expresses is: five stopple coupon front ends in five sampling sub-agencies are X-shaped arrangement;
Figure 20 is the schematic diagram two of the utility model system; Sampling mechanism in figure comprises: remittance tracheae and three sampling sub-agencies; Each sampling sub-agencies comprises: stopple coupon, miniature electric variable valve and little differential pressure sensor; The flue gas that the displacement table be made up of 9 arrows in figure discharges, other each arrow represents the gas flow direction at place place;
Figure 21 is the vertical view of Figure 20; Each arrow in figure represents the flow direction at place place;
Figure 22 is the schematic diagram three of the utility model system; The flue gas that the displacement table be made up of 3 arrows in figure discharges, other each arrow represents the gas flow direction at place place;
Figure 23 is the schematic diagram four of the utility model system; The flue gas that the displacement table be made up of 3 arrows in figure discharges, other each arrow represents the gas flow direction at place place;
Figure 24 is the schematic diagram five of the utility model system; The flue gas that the displacement table be made up of 3 arrows in figure discharges, other each arrow represents the gas flow direction at place place;
Figure 25 is the schematic diagram six of the utility model system; The flue gas that the displacement table be made up of 3 arrows in figure discharges, other each arrow represents the gas flow direction at place place;
Figure 26 is the schematic diagram seven of the utility model system; The flue gas that the displacement table be made up of 3 arrows in figure discharges, other each arrow represents the gas flow direction at place place;
Figure 27 is one of utility model system schematic in embodiment one, and the system in this figure is in normal detected state; The flue gas that the displacement table be made up of 3 arrows in figure discharges, other each arrow represents the gas flow direction at place place;
Figure 28 is one of anterior schematic diagram with elbow structure of stopple coupon; The displacement table be made up of 5 arrows in figure by under the flue gas of walking upward, other each arrow represents the gas flow direction at place place;
Figure 29 is the schematic diagram that sampling mechanism contains stand tube; The flue gas that the displacement table be made up of 5 arrows in figure is upwards walked, other each arrow represents the gas flow direction at place place;
Figure 30 is the schematic diagram that sampling mechanism contains stand tube and direction pipe; The flue gas that the displacement table be made up of 6 arrows in figure is upwards walked, other each arrow represents the gas flow direction at place place;
Figure 31 is one of direction pipe schematic diagram, and the direction pipe in figure there occurs anticlockwise deflection; Arrow in figure represents the flow of flue gas direction in flue;
Figure 32 is that the direction pipe in direction pipe schematic diagram two, figure there occurs clockwise deflection; Arrow in figure represents the flow of flue gas direction in flue;
Figure 33 is the accurate bias free in pipe direction, direction in direction pipe schematic diagram three, figure; Arrow in figure represents the flow of flue gas direction in flue;
Figure 34 is that the system in the utility model system schematic two, this figure in embodiment one is in blowback demarcation state; The flue gas that the displacement table be made up of 3 arrows in figure discharges, other each arrow represents the gas flow direction at place place;
Figure 35 is the schematic diagram two that stopple coupon front portion has elbow structure; The displacement table be made up of 5 arrows in figure is by the left flue gas walked towards right lateral;
Figure 36 is the schematic diagram three that stopple coupon front portion has elbow structure; The displacement table be made up of 5 arrows in figure is by the right flue gas walked towards left lateral;
Figure 37 is the schematic diagram four that stopple coupon front portion has elbow structure; The oblique flue gas of walking upward of a displacement table be made up of 5 arrows in figure.
Number in the figure explanation
1. sampling mechanism; 2. stopple coupon; 2-1. stopple coupon; 2-2. stopple coupon; 5. flue; 13. remittance tracheaes; 18. direction pipes; 19. stand tubes; 21. water backs; 22. jet heater blocks; 31. first negative-pressure pipelines; 32. second negative-pressure pipelines, 33. lasing light emitters; 33-1 laser beam; 34. measuring cells; 35. gas-powered mechanisms; 36. light-collecting lens; 37. probes; 38. normals;
A. angle; CIDY. measuring unit; CY. differential pressure pick-up; FCF. solenoid valve is demarcated in blowback; SF. jet blower; STJF. jet variable valve; SLQ. ejector; WT. miniature electric variable valve; WCY. little differential pressure sensor; WC. temperature sensor.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Embodiment
The detection of low concentration multiple spot cannot be carried out in the flue of fume emission to solve, the utility model proposes following technical scheme.
Embodiment one
Fuel-burning power plant is discharged flue gas, and in order to the object of environmental protection, flue gas first will use dust arrester to remove dust before discharging, and then discharges in air.
Utility model system in the present embodiment is monitored the dust situation in flue gas; Monitoring point is arranged in the flue after dedusting.Owing to having made dust removal process, the dust concentration of this monitoring point is relatively low, so the checkout equipment of prior art cannot carry out accurately, reliably detecting, and the utility model system of the present embodiment one can be carried out accurately, reliable on-line real-time measuremen, and briefing is as follows.
Figure 27 is one of utility model system schematic in embodiment one, and the system in this figure is in normal detected state; The flue gas that the displacement table be made up of 3 arrows in figure discharges, other each arrow represents the gas flow direction at place place.Figure 34 is that the system in the utility model system schematic two, this figure in embodiment one is in blowback demarcation state; The flue gas that the displacement table be made up of 3 arrows in figure discharges, other each arrow represents the gas flow direction at place place.
Label declaration in Figure 27 and Figure 34:
1. sampling mechanism; 2. stopple coupon; 2-1. stopple coupon; 2-2. stopple coupon; 5. flue; 13. remittance tracheaes; 18. direction pipes; 19. stand tubes; 21. water backs; 22. jet heater blocks; 31. first negative-pressure pipelines; 32. second negative-pressure pipelines; 33. lasing light emitters; 33-1 laser beam; 34. measuring cells; 35. gas-powered mechanisms; 36. light-collecting lens; 37. probes; 38. normals;
A. angle; CLDY. measuring unit; CY. differential pressure pick-up; FCF. solenoid valve is demarcated in blowback; SF. jet blower; STJF. jet variable valve; SLQ. ejector; WT. miniature electric variable valve; WCY. little differential pressure sensor; WC. temperature sensor.
One, the parts that system is main
1. jet blower SF provides pressurized air, and filtrator is equipped with in its inflow point, and the air entered is filtered, and what namely jet blower exported is clean pressurized air.
2. jet variable valve STJF, makes compressed-air actuated air pressure level regulate and be stabilized in desired value.
3. water back 21 and jet heater block 22, to the pressurized air of process heat.
4. temperature sensor WC, detects the compressed air temperature after heating, and reports to automation control circuit; Does automation control circuit judge after receiving report: temperature is too low or too high? temperature is too low, connects heater circuit, heats; Temperature is too high, cuts off heater circuit, stops heating.
5. ejector SLQ provides negative pressure driving force, produces negative pressure, the gas on the left of this port is sucked at its passive air inlet port left part port of ejector SLQ (in the Figure 27).
6. measuring unit CLDY, detects sample gas.In the utility model, measuring unit CLDY i.e. detector.Measuring unit CLDY comprises detector main body and sensor; Sensor comprises: the circuit such as part, and amplification, shaping of popping one's head in.
7. differential pressure pick-up CY, detects the air flow rate in negative-pressure pipeline, and reports to automation control circuit; Automation control circuit had both obtained the airshed numerical value in negative-pressure pipeline, obtained detected numerical value again from measuring unit CLDY, thus can obtain or by calculating complete data, the Dust Capacity of such as every cubic metre, etc.
In figure 27, differential pressure pick-up CY is arranged in the first negative-pressure pipeline; If differential pressure pick-up CY is arranged in the second negative-pressure pipeline, and its effect is the same.
8. solenoid valve FCF is demarcated in blowback, and when system is in normal detected state, the gas circuit between its air inlet port and air outlet is cut-off, namely obstructed; When system is in blowback demarcation state, the gas circuit that blowback is demarcated between solenoid valve FCF air inlet port and air outlet is communicated with.
9. sampling mechanism 1, has five to sample sub-agencies in the present embodiment; Each sampling sub-agencies has a stopple coupon 2, miniature electric variable valve WT and little differential pressure sensor WCY, that is: sampling mechanism 1 has five stopple coupons, 2, five miniature electric variable valve WT and five little differential pressure sensor WCY.
The front end of each stopple coupon 2 is positioned at diverse location, in rods arranged in horizontal line, as shown in figure 17.Setting like this and the sample gas obtained, more representative and authenticity; Review prior art, the representativeness of single sampling spot and authenticity are just much poor.
Each stopple coupon 2, its front portion has elbow structure, namely: the body portion of stopple coupon 2 is the level of state.The front portion of stopple coupon 2, before this in swelling upward, turns round in circular arc then, last port in downward to.Stopple coupon 2 is as part, and its shape and structure describes as front, can understand with reference to Figure 28; Stopple coupon 2 in Figure 28 is three, and the present embodiment is five.Elbow structure of the present utility model, is conducive to the port that dust, particularly big dust particle enter stopple coupon 2, is conducive to entering the dust of port, moves ahead swimmingly in stopple coupon 2.
In flue 5, stopple coupon 2 port towards the flow direction with flue gas, should both in opposite directions arrange, completely just right.
10. remittance tracheae 13, its front portion is communicated with the rear portion of five stopple coupons 2.Converge in remittance tracheae 13 and naturally-occurring mixing from the sample gas of five stopple coupons 2; Sample gas is inhaled in the first negative-pressure pipeline again, then enters in measuring cell 34, enters in the second negative-pressure pipeline later, discharges finally by ejector SLQ.
The situation of the objects such as 11. measuring cells 34 and sensor probe, see Fig. 3.
In Fig. 3, the normal of light-collecting lens and the normal of probe overlap, and the normal overlapped and laser beam are the angle of 45° angle degree; A in figure, represents the angle between normal and laser beam, and its numerical value is 45° angle degree.
When being full of pure air in measuring cell 34, laser beam 33-1 has no to stop the opposite side in ground directive measuring cell 34 from the side in measuring cell 34; When flowing through the flue gas of low concentration in measuring cell 34, the particle in flue gas can affect, block laser beam 33-1, and the particle in flue gas can produce scattered light, and scattered light has all directions character, and the intensity of scattered light is directly proportional to the concentration of particle.
The scattered light received focuses on the photosensitive point of probe by light-collecting lens; The light that photosensitive point receives, the intensity of this light is larger, then the upper electric signal obtained of probe is larger.
In addition, when actual installation, because the temperature in measuring cell 34 is higher, can the probe of sensor be arranged in measuring cell 34, by other circuit of sensor, as amplifying circuit, shaping circuit etc. are placed on outside measuring cell 34, will be popped one's head in by wire and the electrical connection of other circuit; Be electrically connected by the display circuit of wire by other circuit and detector again, and be electrically connected with automation control circuit.
During normal detection, the sample gas in measuring cell 34 continuously flows from left to right, and the probe part of sensor can find out the situation of sample gas online in real time, and through circuit transmission such as amplification, shapings, the Displaying Meter finally in detector main body shows.
Two, the key operation of the present embodiment one system is as follows:
1. for a long time, detect the dust situation in flue gas continuously;
2. the short time carries out blowback cleaning and staking-out work.
Three, the principal states of the present embodiment one system is following 1 and 2:
1. system is in detected state for a long time, and during this state, blowback is demarcated gas circuit between the air inlet port of solenoid valve FCF and air outlet and is cut off, and correlation circumstance is understood see Figure 27.
2. the system short time is in blowback and demarcates state, and during this state, blowback is demarcated gas circuit between the air inlet port of solenoid valve FCF and air outlet and is communicated with, and correlation circumstance is understood see Figure 34.
Embodiment two
In above-described embodiment one, utility model system is applied to the flue gas inspection of low concentration, and the concrete project detected is the dust situation in flue gas.
If the utility model system in embodiment one is transformed a little, just can detect other particle compositions in low-concentration flue gas, refer to the following introduction of the present embodiment two.
Carry out two following transformations:
1. each stopple coupon 2, its front portion has elbow structure also not to be needed; Without the straight shape of turning round.
2. the front end of each stopple coupon 2 installs filtering head additional; The effect of filtering head is: filter, stop that dust rubbish enters in stopple coupon 2, and in low-concentration flue gas, the material (finely ground particles) of tested composition does not enter in stopple coupon 2 by stop.Aforementioned finely ground particles, its diameter dimension is far smaller than the diameter dimension of dust.
Utility model system in embodiment one, through the above transformation of 1,2, just become another utility model system of the present embodiment two, this system is not suitable for the dust detected in flue gas, because the diameter of dust granules thing is very large, the dust of the overwhelming majority is filtered head, stop; But go for detecting other finely ground particles in flue gas.

Claims (9)

1. a novel low-concentration flue gas detection system of particles, comprising: sampling mechanism (1), negative-pressure pipeline, gas-powered mechanism (35), automation control circuit, and detector; Described detector comprises the sensor detecting flue gas particle substrate concentration;
It is characterized in that:
Described system comprises: measuring cell (34), produces the lasing light emitter (33) of laser beam (33-1), and light-collecting lens (36); Laser beam (33-1) is from the opposite side in side directive measuring cell (34) in measuring cell (34);
The probe (37) of light-collecting lens (36) and sensor, they are positioned at measuring cell (34), their normal overlaps, their normal and the angle of laser beam (33-1) in 45° angle degree, the set of their normal forms circular conical surface, the direction that the vertex of a cone of circular conical surface sets out towards laser beam (33-1); Light-collecting lens (36) pops one's head in (37) away from the vertex of a cone close to the vertex of a cone;
Described sampling mechanism (1) comprising: remittance tracheae (13), and multiple sampling sub-agencies; Described multiplely refer to more than three;
Each sampling sub-agencies includes: stopple coupon (2), regulate the miniature electric variable valve (WT) of stopple coupon (2) interior air-flow size, and measure the little differential pressure sensor (WCY) of stopple coupon (2) interior air flow rate; Miniature electric variable valve (WT) and automation control circuit electrical connection; Little differential pressure sensor (WCY) and automation control circuit electrical connection; The rear end of each stopple coupon (2) is all communicated with remittance tracheae (13) gas circuit; The front end of gross sample pipe (2) is all arranged in the flue (5) of fume emission, and the front end of each stopple coupon (2) is positioned at diverse location;
Described negative-pressure pipeline comprises the first negative-pressure pipeline (31) and the second negative-pressure pipeline (32);
The tracheae (13) that converges is communicated with the front end of the first negative-pressure pipeline (31); The rear end of the first negative-pressure pipeline (31) is communicated with the front side of measuring cell (34); The rear side of measuring cell (34) is communicated with the front end of the second negative-pressure pipeline (32); The rear end of the second negative-pressure pipeline (32) is communicated with gas-powered mechanism (35).
2. the novel low-concentration flue gas detection system of particles of one according to claim 1, is characterized in that:
Described gas-powered mechanism (35) comprising: jet blower (SF), jet variable valve (STJF), and ejector (SLQ); Described ejector (SLQ) is containing active air inlet port, passive air inlet port and air outlet; Described jet blower (SF), its air intake opening is communicated with air, and its gas outlet is communicated with the input port gas circuit of jet variable valve (STJF); The output port of jet variable valve (STJF) is communicated with the active inlet end implication road of ejector (SLQ);
Described remittance tracheae (13) is airtight container;
The rear end of the second negative-pressure pipeline (34) is communicated with the passive inlet end implication road of ejector (SLQ).
3. the novel low-concentration flue gas detection system of particles of one according to claim 1, is characterized in that:
Described gas-powered mechanism (35) comprising: jet heater block (22), water back (21), jet blower (SF), jet variable valve (STJF), and ejector (SLQ); Described ejector (SLQ) is containing active air inlet port, passive air inlet port and air outlet;
Described jet heater block (22), it is set to the first situation or it is set to the second situation;
The first described situation is: described jet blower (SF), and its air intake opening is communicated with air, and its gas outlet is communicated with the input port gas circuit of jet variable valve (STJF); The output port of jet variable valve (STJF) is connected with one end of water back (21), the body portion of water back (21) is through jet heater block (22), and the other end of water back (21) is communicated with the active inlet end implication road of ejector (SLQ);
Described the second situation is: described jet blower (SF), its air intake opening is communicated with air, its gas outlet is connected with the one end of water back (21), the body portion of water back (21) is through jet heater block (22), and the other end of water back (21) is communicated with the input port gas circuit of jet variable valve (STJF); The output port of jet variable valve (STJF) is communicated with the active inlet end implication road of ejector (SLQ);
The rear end of the second negative-pressure pipeline (34) is communicated with the passive inlet end implication road of ejector (SLQ).
4. the novel low-concentration flue gas detection system of particles of one according to claim 1, is characterized in that:
Described detection system comprises blowback calibrating device; Described blowback calibrating device comprises: solenoid valve (FCF) is demarcated in blowback;
Described gas-powered mechanism (35) comprising: jet blower (SF), jet variable valve (STJF), ejector (SLQ), and jet connecting pipe; Described ejector (SLQ) is containing active air inlet port, passive air inlet port and air outlet; Described jet blower (SF), its air intake opening is communicated with air, and its gas outlet is communicated with the input port gas circuit of jet variable valve (STJF); The output port of jet variable valve (STJF) is communicated with the active inlet end implication road of ejector (SLQ) by jet connecting pipe;
The rear end of the second negative-pressure pipeline (32) is communicated with the passive inlet end implication road of ejector (SLQ);
Solenoid valve (FCF) is demarcated in described blowback, and its air inlet port is communicated with jet connecting pipe, and its air outlet is communicated with the body portion of the first negative-pressure pipeline (31), and its terminals are electrically connected with automation control circuit.
5. the novel low-concentration flue gas detection system of particles of one according to claim 1, is characterized in that: described stopple coupon (2), and its front portion has elbow structure; The concrete condition of elbow structure is as follows:
The body portion of described stopple coupon (2) is the level of state; The front portion of stopple coupon (2), before this in swelling upward, turns round in circular arc then, last port in downward to;
Stopple coupon (2) port towards, the flow direction of tested flue gas, should both arrange in opposite directions in flue (5).
6. the novel low-concentration flue gas detection system of particles of one according to claim 1, is characterized in that:
Described sampling mechanism (1) comprises stand tube (19);
The front portion of stand tube (19) and body portion all stretch in flue (5), and the rear portion of stand tube (19) is fixedly connected with walling of flue detachable; Stopple coupon (2) is set in stand tube (19), and both are fixedly connected with;
Stopple coupon (2) port towards, the flow direction of tested flue gas, should both arrange in opposite directions in flue.
7. the novel low-concentration flue gas detection system of particles of one according to claim 1, is characterized in that:
Described sampling mechanism (1) comprising: stand tube (19), direction pipe (18), and direction differential pressure pick-up;
Described direction differential pressure pick-up, it is arranged on pipe (18) place, direction, and its terminals are electrically connected with automation control circuit; Described direction pipe (18) is fixedly connected with stand tube (19);
The front portion of stand tube (19) and body portion all stretch in flue (5), and the rear portion of stand tube (19) is connected with walling of flue detachable; Stopple coupon (2) is set in stand tube (19), and both are fixedly connected with;
Direction pipe (18) towards with stopple coupon (2) port towards completely the same.
8. the novel low-concentration flue gas detection system of particles of one according to claim 1, it is characterized in that: described system comprises differential pressure pick-up (CY), it is arranged on the first negative-pressure pipeline place (31) or it is arranged on the second negative-pressure pipeline (32) place, its terminals and automation control circuit electrical connection.
9. the novel low-concentration flue gas detection system of particles of one according to claim 1, it is characterized in that: described multiple sampling sub-agencies are three sampling sub-agencies, or described multiple sampling sub-agencies are four sampling sub-agencies, or described multiple sampling sub-agencies are five sampling sub-agencies;
When three sampling sub-agencies, the front end of its three stopple coupons (2) is rods arranged in horizontal line or the arrangement in isosceles triangle;
When four sampling sub-agencies, the front end of its four stopple coupons (2) is rods arranged in horizontal line or rectangular arrangement;
When five sampling sub-agencies, the front end of its five stopple coupons (2) is rods arranged in horizontal line or the arrangement in X-shaped.
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105547949A (en) * 2016-01-29 2016-05-04 中绿环保科技股份有限公司 Removable low-concentration dust meter
CN105675453A (en) * 2016-03-03 2016-06-15 中兴仪器(深圳)有限公司 Gas particulate matter measuring system with gas particulate matter generating device
CN105806673A (en) * 2016-05-06 2016-07-27 南京波瑞自动化科技有限公司 Multipoint sampling device and multipoint sampling system for dust measurement of large section flue of power station
CN105987868A (en) * 2015-02-09 2016-10-05 上海北分仪器技术开发有限责任公司 Low-concentration flue gas particle detection system
CN106018214A (en) * 2016-05-12 2016-10-12 绍兴文理学院 Wear particle online monitoring method using centrifugation, adsorption and adjacent capacitance
CN106018002A (en) * 2016-05-17 2016-10-12 南京友智科技有限公司 Matrix type mixed constant-speed sampling device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105987868A (en) * 2015-02-09 2016-10-05 上海北分仪器技术开发有限责任公司 Low-concentration flue gas particle detection system
CN105547949A (en) * 2016-01-29 2016-05-04 中绿环保科技股份有限公司 Removable low-concentration dust meter
CN105675453A (en) * 2016-03-03 2016-06-15 中兴仪器(深圳)有限公司 Gas particulate matter measuring system with gas particulate matter generating device
CN105806673A (en) * 2016-05-06 2016-07-27 南京波瑞自动化科技有限公司 Multipoint sampling device and multipoint sampling system for dust measurement of large section flue of power station
CN106018214A (en) * 2016-05-12 2016-10-12 绍兴文理学院 Wear particle online monitoring method using centrifugation, adsorption and adjacent capacitance
CN106018002A (en) * 2016-05-17 2016-10-12 南京友智科技有限公司 Matrix type mixed constant-speed sampling device

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