CN2254183Y - Automatic tracking dynamic pressure balanced soot sampler - Google Patents
Automatic tracking dynamic pressure balanced soot sampler Download PDFInfo
- Publication number
- CN2254183Y CN2254183Y CN 95229007 CN95229007U CN2254183Y CN 2254183 Y CN2254183 Y CN 2254183Y CN 95229007 CN95229007 CN 95229007 CN 95229007 U CN95229007 U CN 95229007U CN 2254183 Y CN2254183 Y CN 2254183Y
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- differential pressure
- sampling
- flue gas
- pitot tube
- dynamic pressure
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Abstract
The utility model relates to an automatic tracking dynamic pressure balanced soot sampler. Differential pressure type sensors are respectively connected with the two joints of the tail of an S type pitot tube and a hole plate air charging and discharging hole. Flue pneumatic pressure and air flow pressure difference detected by the two differential pressure type sensors are respectively converted to electric voltage signals, the sampling flow quantity is regulated, and the constant speed tracing sampling close loop automatic control is achieved. Being matched with a digital and analog converter, a microprocessor, a printer and a display, the device can display test result and flue gas state parameter by digit and print the test result and the flue gas state parameter. The constant speed tracking precision is high. The structure is simple. The utility model is miniature and portable.
Description
The utility model relates to a kind of measurement instrument of smoke dust sampling, especially a kind ofly controls the sampling flow velocity automatically by solenoid valve, realizes that constant speed follows the tracks of the measurement instrument of flue gas flow rate, belongs to the measurement mechanism technical field.
The energy in China 70% is taken from fire coal, and coal fire discharged pollutant is the main cause that causes atmospheric pollution.Therefore, must routine carry out strict monitoring for flue dust coal fire discharged in heating, the industrial processes.At present the smoke dust sampling instrument that uses by sampling pipe, remove sulphuric dioxide, dehydrating unit, flow measurement and form with control device and aspiration pump.When gathering flue dust, the sampling pipe that filter cylinder will be housed inserts flue, opens aspiration pump, and the bleeding regulating flowrate control valve makes the flue gas flow rate that enters sampling pipe by sampling pipe front-end sampling mouth equal the flue gas flow rate of this measurement point of flue.After finishing the interior a plurality of measuring points measurements of flue in accordance with regulations, take out filter cylinder in sampling pipe, drying, weight weighing according to the volume of gathering flue gas, calculate smoke dust discharge concentration under the standard state again, and airshed in the flue, calculate smoke discharge amount.
Realize the constant speed tracking sampling in view of current smoke dust sampling instrument adopts manual methods, and the flow velocity of exhaust changes in the flue, flue dust is accumulated the variation that also can cause the flow velocity of bleeding on filter cylinder, therefore, regulate flowrate control valve continually.Even so, the moving operation of armrest still is difficult to follow the tracks of the variation of going up flue gas flow rate.Thereby measurement accuracy is poor, causes bigger measuring error.And from external import from motion tracking smoke dust sampling instrument, then cost an arm and a leg.
It is a kind of simple in structure, easy to use that the purpose of this utility model provides, utilize microprocessor realize data processing, automaticity height again price cheap from motion tracking dynamic pressure balancing smoke dust sampling instrument.
The utility model is achieved in that and includes: by S type pitot tube, temperature sensor, have the combined type sampling pipe that orifice plate sampling tube head constitutes, remove the sulphuric dioxide device, dehydrating unit, cabinet, aspiration pump, and be installed in the cabinet by integral operation amplifier, analog to digital converter, microprocessor and mini-printer, measurement and control device that LCD display constitutes, it is characterized in that: at two joints of S type pitot tube afterbody with have advancing of orifice plate sampling pipe, two joints of gas outlet are connected with a differential pressure pick-up respectively, the output terminal of these two differential pressure pick-ups inserts two input ends of an operational amplifier respectively through two voltage amplifiers, the output terminal of this operational amplifier is connected with the control end of the solenoid valve of controlling extraction flow and the input end of analog to digital converter respectively, the input end of this analog to digital converter also is connected to the signal that the said temperature sensor is exported respectively behind voltage amplifier, the orifice plate of above-mentioned S type pitot tube and sampling pipe advances, latter linked two differential pressure pick-ups of gas outlet joint are two signals after voltage amplifier amplifies separately respectively, and the voltage amplification signal that measures the differential pressure pick-up output of flue gas static pressure and gas circuit negative pressure; The output terminal of this analog to digital converter then is connected with the input end of microprocessor.
Above-mentioned S type pitot tube is O～2000pa with the pressure measurement scope of two differential pressure pick-ups that orifice plate inlet, outlet joint is connected respectively afterwards.
The above-mentioned flow control scope of the solenoid valve of operational amplifier output DC pressure-controlled that is subjected to should be at 5～45L/ branch, and can select homemade model for use is the LMV-C product.
Above-mentioned gas circuit should guarantee tightly air tight, and its vacuum tightness should be not less than 6.7kpa.
The utility model be by S type pitot tube, temperature sensor, have an afterbody of the combined type sampling pipe that orifice plate sampling tube head constitutes, promptly two joints of two joints of S type pitot tube afterbody and orifice plate inlet, outlet are connected with a differential pressure pick-up respectively.During sampling, when measuring flue gas dynamic pressure variation by S type pitot tube, be subjected to the solenoid valve of error voltage control can regulate its opening width automatically, change extraction flow, the pressure reduction that connects the orifice plate differential pressure pick-up is equated with dynamic pressure, its tracking response time only is a few tens of milliseconds, thereby really realizes the constant speed tracking sampling and improve measurement accuracy.Because design concept of the present utility model is a dynamic pressure balancing, reach constant speed again, handle and calculate the water capacity of flue gas and related parameter is arranged so can be directly extrapolate in the flue extraction flow line data of going forward side by side from sampling volume, saved the hand sampling method and needed to measure in advance flue gas pressures, temperature, the operation of water capacity and loaded down with trivial details hand computation by microprocessor.In addition, be furnished with microprocessor because of the utility model and can carry out keyboard operation, numeral shows and prints measurement result, and the automaticity height has realized that the automatic constant speed of smoke dust sampling is followed the tracks of.This installs small portable, and simple in structure, price is cheap.
Now in conjunction with the accompanying drawings and embodiments, further narrate the utility model.
Fig. 1 is that structure of the present utility model is formed synoptic diagram.
Fig. 2 is control panel figure of the present utility model.
Referring to Fig. 1, the utility model includes: measure the temperature sensor 1 of flue-gas temperature, measure the S type pitot tube 2 of flue gas dynamic pressure, gather the sampling pipe 3 that flue dust has orifice plate, be used to remove sulfur dioxide in flue gas device 4, be used for removing the removal moisture drying apparatus 5 of flue gas moisture; And the solenoid valve 7 of the control extraction flow that in sampling instrument cabinet 6, is provided with, the flowmeter 8 of metering extraction flow, measure the differential pressure pick-up 9 of flue gas dynamic pressure, produce the differential pressure pick-up 10 and the differential pressure pick-up 11 that measures gas circuit negative pressure in flue gas static pressure and the sampling system of pressure reduction when measuring air communication over-sampling pore plate; Also be provided with the measurement and the control device that constitute by integral operation amplifier 16, analog to digital converter 17, microprocessor 18 and mini-printer 19, LCD display 20 in the cabinet 6.At two joints of S type pitot tube 2 afterbodys with have advancing of orifice plate sampling pipe 3, two joints of gas outlet respectively with a differential pressure pick- up 9,10 connect, these two differential pressure pick- ups 9,10 output terminal is respectively through two voltage amplifiers 13,14 and insert two input ends of an operational amplifier 16, the output terminal of this operational amplifier 16 is connected with the control end of the solenoid valve 7 of controlling extraction flow and the input end of analog to digital converter 17 respectively, the input end of this analog to digital converter 17 also is connected to the signal that said temperature sensor 1 is exported respectively behind voltage amplifier 12, the orifice plate of above-mentioned S type pitot tube 2 and sampling pipe 3 advances, latter linked two differential pressure pick-ups 9 of gas outlet joint, 10 respectively through voltage amplifier 13 separately, two signals after 14 amplifications, and the voltage amplification signal that measures differential pressure pick-up 11 outputs of flue gas static pressure and gas circuit negative pressure; The output terminal of this analog to digital converter 17 then is connected with the input end of microprocessor 18.In addition, device adopts flexible pipe 22 with the sampling pipe 3 of S type pitot tube 2, perforated plate, except that sulphuric dioxide device 4, dehydrating unit 5, solenoid valve 7, flowmeter 8 and aspiration pump fuse, and gas circuit requires that good air-tightness is arranged, and its vacuum tightness should be not less than 6.7kpa.
The utility model principle of work is: measure sampling pipe 3 overdraughts by differential pressure pick-up 10 and flow through the pressure reduction that orifice plate produces, and convert the direct current millivolt signal to, amplify input integral operational amplifier 16 through voltage amplifier 14; 9 flue measuring point flue gas dynamic pressures that S type pitot tube 2 is measured of differential pressure pick-up convert the direct current millivolt signal to, amplify through voltage amplifier 13, and also the input integral operational amplifier 16.Two voltage signals relatively amplify the aperture of the DC voltage of back output with control electromagnetic valve 7.When latter's voltage signal was higher than the former, solenoid valve 7 apertures increased, and the airshed by orifice plate increases, to the voltage signal of orifice differential pressure conversion with till the latter equates; When latter's voltage signal was lower than the former, solenoid valve 7 apertures reduced, and the airshed by orifice plate reduces, to the voltage signal of orifice differential pressure conversion with till the latter equates; If both voltage signals equate that solenoid valve 7 apertures are constant, regulate sampling flow thus, reach the purpose of the automatic control of closed loop of constant speed tracking sampling.This device constant speed tracking response time is a few tens of milliseconds only, tracking accuracy≤± 5%.The pressure measurement scope of differential pressure pick- up 9,10 is 0～2000pa.
Volume by solenoid valve 7 gases is measured by flowmeter 8, handle through analog to digital converter 17 and microprocessor 18, utilize the principle of " in the gas circuit on arbitrary sectional area same time flow equate ", directly calculate the flow velocity, the flow that drain flue gas at the standard state lower flue; And the flue-gas temperature of being measured by temperature sensor 1, flue gas static pressure that differential pressure pick-up 11 is measured can directly calculate the water capacity of flue gas.
The utility model is equipped with analog to digital converter 17, can convert relevant voltage signal to digital signal, and after related data delivered to microprocessor 18 and handles, print and measure relevant parameter and measurement result by mini-printer 19, show above-mentioned have related parameter and measurement result by LCD display 20.
Referring to Fig. 2, following components and parts are installed: LCD display 20 on the control panel 23 of the present utility model, the interface 24 of external mini-printer 19, cursor shift key 25, input digit increases progressively key 26, key 27 successively decreases, start instrument operation key 28, finish the stop key 29 of operation, the enter key 30 of input digit, the pipe adapter 31 that links to each other with solenoid valve 7 with exsiccator device 5, the pipe adapter 32 that links to each other with aspiration pump 21 with flowmeter 8, the pipe adapter 33 that links to each other with flexible pipe 22 with differential pressure pick-up 11, the pipe adapter 34 that links to each other with differential pressure pick-up 9 with pitot tube 2,35,36 of the pipe adapter that links to each other with differential pressure pick-up 10 with orifice plate on having orifice plate sampling pipe 3,37, the socket 38 of connection temperature sensor 1 plug, pumping source socket 39, main power socket 40, power switch 40.
The utility model has been manufactured experimently out model machine, and has carried out implementing test, has realized goal of the invention, and its key technical indexes is as follows:
Constant speed tracking accuracy: ± 5%
Constant speed trace flow weight range: 5～45L/min
Flow velocity is followed the tracks of measurement range: when sampling outspoken footpath 6mm is 3.5～26.5m/s
When sampling outspoken footpath 8mm is 2.0～14.9m/s
Flow pointing accuracy: ± 2.5%
Integrated flow precision: ± 2.5%
Supply voltage: 220 ± 10%V, frequency 50HZ
Aspiration pump: no load discharge is greater than 110L/min
Sealing: during vacuum tightness in the main frame 〉=6.7kpa, close aspiration pump, vacuum tightness descends and is not more than 0.2kpa in 1 minute
The main components and parts that use among the utility model embodiment are: the homemade LMV-C type of solenoid valve, the homemade MTC-G type of flowmeter, differential pressure pick-up Switzerland produces AM5302DV and AM5302GV type, and the microprocessor U.S. produces the 80C31 type, and the analog to digital converter U.S. produces the ICL7135 type.Its main calculating parameter is:
The flue gas total head
Flue gas flow rate
Air capacity under flue gas amount and the standard state
Humidity of flue gas
Constant speed is followed the tracks of percent
Final calculating of the utility model and printed report result are:
Date
Ambient atmosphere pressure
Sampling number
Sampling time
Flue is measured cross-sectional area
The outspoken footpath of sampling
Coefficient of Pitot tube
The flue gas static pressure
The average dynamic pressure of flue gas
The flue gas total head
The flue gas medial temperature
Humidity of flue gas
The flue gas mean flow rate
Constant speed is followed the tracks of percent
Standard state down-sampling volume
Smoke discharge amount
Smoke discharge amount under the standard state
Claims (4)
1. one kind from motion tracking dynamic pressure balancing smoke dust sampling instrument, include: by S type pitot tube, temperature sensor, have the combined type sampling pipe that spiracular plate sampling tube head constitutes, remove the sulphuric dioxide device, dehydrating unit, cabinet, aspiration pump, and be installed in the cabinet by integral operation amplifier, analog to digital converter, microprocessor and mini-printer, measurement and control device that LCD display constitutes, it is characterized in that: at two joints of S type pitot tube afterbody with have advancing of orifice plate sampling pipe, two joints of gas outlet are connected with a differential pressure pick-up respectively, the output terminal of these two differential pressure pick-ups inserts two input ends of an operational amplifier respectively through two voltage amplifiers, the output terminal of this operational amplifier is connected with the control end of the solenoid valve of controlling extraction flow and the input end of analog to digital converter respectively, the input end of this analog to digital converter also is connected to the signal that the said temperature sensor is exported respectively behind voltage amplifier, the orifice plate of above-mentioned S type pitot tube and sampling pipe advances, latter linked two differential pressure pick-ups of gas outlet joint are two signals after voltage amplifier amplifies separately respectively, and the voltage amplification signal that measures the differential pressure pick-up output of flue gas static pressure and gas circuit negative pressure; The output terminal of this analog to digital converter then is connected with the input end of microprocessor.
As claimed in claim from motion tracking dynamic pressure balancing smoke dust sampling instrument, it is characterized in that: the pressure measurement scope of two differential pressure pick-ups that are connected respectively after above-mentioned S type pitot tube and the orifice plate inlet, outlet joint is 0～2000pa.
3. as claimed in claim 1 from motion tracking dynamic pressure balancing smoke dust sampling instrument, it is characterized in that: the above-mentioned flow control scope of the solenoid valve of operational amplifier output DC pressure-controlled that is subjected to should be at 5～45L/ branch, and can select homemade model for use is the LMV-C product.
4. as claimed in claim 1 it is characterized in that: above-mentioned gas circuit should guarantee tightly air tight from motion tracking dynamic pressure balancing smoke dust sampling instrument, and its vacuum tightness should be not less than 6.7kpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95229007 CN2254183Y (en) | 1995-12-25 | 1995-12-25 | Automatic tracking dynamic pressure balanced soot sampler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95229007 CN2254183Y (en) | 1995-12-25 | 1995-12-25 | Automatic tracking dynamic pressure balanced soot sampler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2254183Y true CN2254183Y (en) | 1997-05-14 |
Family
ID=33874388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95229007 Expired - Fee Related CN2254183Y (en) | 1995-12-25 | 1995-12-25 | Automatic tracking dynamic pressure balanced soot sampler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2254183Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103044A (en) * | 2011-01-20 | 2011-06-22 | 马鞍山钢铁股份有限公司 | Isokinetic smoke dust sampling device and sampling method |
| CN102756566A (en) * | 2012-07-24 | 2012-10-31 | 苏州市尚科产品检测中心 | Printing device for environment tester |
| CN103852352A (en) * | 2012-12-06 | 2014-06-11 | 中国人民解放军空军航空医学研究所 | Gas production negative-pressure equipment and gas detection system |
| CN110057628A (en) * | 2019-05-09 | 2019-07-26 | 广州长德环境研究院有限公司 | A kind of energy conservation resistance to compression stationary source exhaust gas sampling system |
| CN112683604A (en) * | 2020-12-07 | 2021-04-20 | 南京波瑞自动化科技有限公司 | Constant-speed sampling device for pressure measurement method |
| CN113670678A (en) * | 2021-09-06 | 2021-11-19 | 山东省计量科学研究院 | Constant-speed tracking sampling method for smoke detection |
-
1995
- 1995-12-25 CN CN 95229007 patent/CN2254183Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103044A (en) * | 2011-01-20 | 2011-06-22 | 马鞍山钢铁股份有限公司 | Isokinetic smoke dust sampling device and sampling method |
| CN102756566A (en) * | 2012-07-24 | 2012-10-31 | 苏州市尚科产品检测中心 | Printing device for environment tester |
| CN103852352A (en) * | 2012-12-06 | 2014-06-11 | 中国人民解放军空军航空医学研究所 | Gas production negative-pressure equipment and gas detection system |
| CN110057628A (en) * | 2019-05-09 | 2019-07-26 | 广州长德环境研究院有限公司 | A kind of energy conservation resistance to compression stationary source exhaust gas sampling system |
| CN112683604A (en) * | 2020-12-07 | 2021-04-20 | 南京波瑞自动化科技有限公司 | Constant-speed sampling device for pressure measurement method |
| CN112683604B (en) * | 2020-12-07 | 2021-11-09 | 南京波瑞自动化科技有限公司 | Constant-speed sampling device for pressure measurement method |
| CN113670678A (en) * | 2021-09-06 | 2021-11-19 | 山东省计量科学研究院 | Constant-speed tracking sampling method for smoke detection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |