CN204359679U - A kind of coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus - Google Patents
A kind of coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus Download PDFInfo
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- CN204359679U CN204359679U CN201420839268.XU CN201420839268U CN204359679U CN 204359679 U CN204359679 U CN 204359679U CN 201420839268 U CN201420839268 U CN 201420839268U CN 204359679 U CN204359679 U CN 204359679U
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Abstract
The utility model discloses a kind of coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus, comprise: the cabinet being provided with two air intake openings and a gas outlet, two air intake openings are respectively used to pass into pressurized air and flue gas to be measured, be provided with in cabinet transmitter module, receiver module, measuring chamber, by gas extraction to be measured to the air conveyor in measuring chamber, tee ball valve, anti-purge solenoid valve, control module and display module.Have that accuracy of detection is high, fast response time, maintenance cost are low, the advantage such as little affected by environment, can be widely used in detecting in real time carbonomonoxide concentration in cogeneration plant's coal pulverizer, there is good prospects for commercial application.
Description
Technical field
The utility model relates to a kind of pick-up unit, is specifically related to coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus, belongs to industrial detection technical field.
Background technology
Coal pulverizer is the fuel crushing system of a quasi-representative, and in electric heating power plant, coal pulverizer is the nucleus equipment for the manufacture of coal dust needed for boiler combustion, and on the economy of whole power plant system, profitability and safe reliability has important impact to its work operation conditions.
In order to improve the service efficiency of coal, enterprise's coal great majority adopt coal powder injection mode to burn, coal pulverizer in coal-grinding powder process because machine friction environment temperature can raise, CO gas can be produced in this process, if CO excessive concentration in coal pulverizer, the spark running into high temperature or mechanical friction can burn and even explode, and therefore, is very important and necessary to the detection and control of CO concentration.
At present, detect both at home and abroad carbon monoxide gas concentration method numerous, wherein comparatively ripely and general mainly contain electrochemical process and infrared absorption method.Electrochemical process principle is simple, with low cost, but comparatively large by surrounding environment influence, and needs often to change chemical raw material, is unfavorable for long-time use; It is higher, highly sensitive that infrared absorption method detects gas concentration precision, and the impact by surrounding environment is less, fast response time, the requirement that applicable factory is detected in real time.The device of the coal pulverizer detection carbon monoxide of present domestic use generally adopts external imported product, and not only price is high, and later maintenance is also very complicated, is unfavorable for that domestic power plant large-scale uses.In addition, in existing Carbon Monoxide Detection device, signal processing circuit wherein generally adopts DC coupling type to amplify photoelectric detection system, and the requirement of this device to light source and detector is very strict, is subject to the impact of the unfavorable factor such as temperature variation and light source ages; For DC coupling type amplifying circuit, even if adopt the amplifying circuit of differential type, also the zero point drift and the temperature drift that overcome amplifier is difficult to, if measuring accuracy requires very high, also stricter to the requirement of the current drift of the input end of amplifying circuit and the leakage current change of detector, considerably increase the design cost of device, later maintenance is simultaneously also very inconvenient.
In view of above-mentioned various reasons, in the urgent need to a kind of new carbonomonoxide concentration pick-up unit, no matter coal pulverizer is in running or shut down condition, and device can both detect carbon monoxide gas body burden in real time, and needs effective production control cost and maintenance cost.
Utility model content
For solving the deficiencies in the prior art, the purpose of this utility model is to provide a kind of measuring accuracy high, the affected by environment little and coal pulverizer carbonomonoxide concentration real-time detection apparatus of advantage of lower cost, guarantees security.
In order to realize above-mentioned target, the utility model adopts following technical scheme:
A kind of coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus, comprise: the cabinet being provided with two air intake openings and a gas outlet, two air intake openings are respectively used to pass into pressurized air and flue gas to be measured, are provided with carbonomonoxide concentration sense channel, automatic zero set (AZS) calibrated channel and the anti-purge passage of anti-clogging in cabinet; Be provided with in cabinet transmitter module, receiver module, measuring chamber, by gas extraction to be measured to the air conveyor in measuring chamber, tee ball valve, anti-purge solenoid valve, control module and display module; Tee ball valve and anti-purge solenoid valve are for realizing the switching between three passages; The infrared-ray that described transmitter module sends received module after measuring chamber receives, and light signal is converted into electric signal and then sends into the control module be attached thereto by receiver module, and described control module is connected by serial ports with between display module.Light signal is converted into electric signal after receiving the infrared-ray that transmitter module sends by receiver module, send into control module, control module is carried out filtering to signal and is carried out A/D conversion again after amplifying and calculate carbonomonoxide concentration, computation process is conventional process of the prior art, finally sends to display module to show result of calculation.
Particularly, aforementioned transmitter module is by black matrix infrared light supply, stepper motor and cut mating plate and form, and described stepper motor carries out pulsed modulation to infrared light supply.
Preferably, aforementioned receiver module is that only paired pulses light has the pyroelectric detector of response, and adopt binary channels interface, a road is reference channel, and another road is Measurement channel; Can reference gas chamber be saved like this, simplify system architecture.
Further, aforementioned pyroelectric detector has narrow band pass filter, can pass through for the infrared light of 3.9-5 micron, reference channel is to 4 microns of infrared light sensitivities, and Measurement channel is to 4.6 microns of infrared light sensitivities.
Particularly, aforementioned control module comprises signal acquisition process unit and the first single-chip microcomputer, first single-chip microcomputer is used for the data that Received signal strength acquisition process unit sends over, calculate carbonomonoxide concentration, monitoring temperature pressure and control each valve event, making system automatically complete blowback and sweep, return to zero and Concentration Testing.
Preferably, aforementioned signal acquisition process unit adopts quadrature modulates circuit, and strong interference immunity, comprising: pre-amplification circuit, bandwidth-limited circuit, analog switch, rectification circuit, RC filtering circuit, rearmounted amplifying circuit and A/D change-over circuit; Light signal is changed into ac voltage signal by pyroelectric detector, amplified by pre-amplification circuit and with analog switch, negative value signal is overturn and filtering alien frequencies signal after bandwidth-limited circuit filtering interfering again, signal carries out RC filtering again after rectifier circuit rectifies, AC signal is filtered into stable direct current signal, direct current signal carries out A/D conversion again after rearmounted amplifying circuit amplifies, and delivers to the first single-chip microcomputer and carry out concentration calculating after converting digital signal to.
Particularly, display module comprises second singlechip, LCD display and power circuit, and wherein, second singlechip communicates for showing carbonomonoxide concentration, pilot relay warning and carrying out 485 with host computer.
Preferably, aforementioned first single-chip microcomputer and second singlechip are AVR single chip, are communicated between the two by serial ports.
Further, at the air intake opening place passing into flue gas to be measured, one device for drying and filtering is installed.
Again further, in aforementioned measuring chamber, heating resistor is installed, its object is to: the infrared absorption peak of water vapor and the infrared absorption peak of carbon monoxide have certain coincidence, and lens produce condensate water and can have a certain impact to light path, therefore have employed the gas generation condensate water that heating resistor can prevent from sucking, thus avoid water vapor on the impact of measurement result.
Usefulness of the present utility model is: (1), the utility model adopt air conveyor to utilize the energy of air-flow in closed conduit, extract flue gas to be measured in coal pulverizer, structure is simple, maintenance cost is also lower, also avoid and measures the impact of room pressure change on measurement result; (2) in cabinet, be provided with carbonomonoxide concentration sense channel, automatic zero set (AZS) calibrated channel and the anti-purge passage of anti-clogging, by the mating reaction of tee ball valve and anti-purge solenoid valve, realize switching flexibly at three kinds of interchannels, complete and detect gas concentration to be measured, calibration is swept and returned to zero in anti-clogging blowback, and anti-purge solenoid valve is in normally open under power-down conditions, continue to lead to pressurized air to air intake opening, ensure that air intake opening does not block, guarantee that device can work for a long time safely and steadly; (3), signal acquisition process unit adopts quadrature modulates circuit, adds anti-external interference ability; (4), receiver module adopts binary channels pyroelectric detector, and have temperature compensation function, system architecture is simple, and accuracy of detection is high; (5), utilize control module and display module by data processing and the process of display piecemeal, make the system cloud gray model in device more smooth, signals collecting is more accurate, and the signal that it also avoid collection produces error because of long-distance transmissions; (6), in addition, in measuring chamber, heating resistor is installed, to the gas-heated to be measured sucked, avoids gas to be measured to produce condensate water in measuring chamber, and then reduce condensate water to the interference of measurement result.To sum up, pick-up unit of the present utility model has that accuracy of detection is high, fast response time, maintenance cost are low, the advantage such as little affected by environment, can be widely used in detecting in real time carbonomonoxide concentration in cogeneration plant's coal pulverizer, there is good prospects for commercial application.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus of the present utility model;
Fig. 2 is the electrical block diagram of the signal acquisition process unit of pick-up unit of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, concrete introduction is done to the utility model.
See Fig. 1, coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus of the present utility model, comprising: the cabinet being provided with two air intake openings and a gas outlet, and two air intake openings are respectively used to pass into pressurized air and flue gas to be measured.
Cabinet is enclosed, its inside be provided with transmitter module, receiver module, measuring chamber, by gas extraction to be measured to the air conveyor in measuring chamber, tee ball valve, anti-purge solenoid valve, control module and display module.In testing process, light signal is converted into electric signal after receiving the infrared-ray that transmitter module sends by receiver module, send into control module, control module is carried out filtering to signal and is carried out A/D conversion again after amplifying and calculate carbonomonoxide concentration, computation process adopts computing module generally conventional in prior art, finally send to display module to show result of calculation, be connected by serial ports between control module with display module.
As shown in Figure 1, A, B, C tri-passages are provided with in the cabinet of pick-up unit of the present utility model, be respectively carbonomonoxide concentration sense channel A, automatic zero set (AZS) calibrated channel B and channel C is swept in anti-clogging blowback, tee ball valve and anti-purge solenoid valve are for realizing the switching between three passages.
When detecting pattern, tee ball valve turns to A channel, air conveyor produces suction under compressed-air actuated effect, gas slowly to be measured in coal pulverizer is drawn onto in measuring chamber equably, preferably, at the air intake opening place passing into flue gas to be measured, one device for drying and filtering is installed, tentatively to filter coal dust and water vapor, when returning to zero calibration mode, tee ball valve turns to channel B, and the remaining carbon monoxide gas in measuring chamber all blows away by pressurized air, then in measuring chamber without CO gas, ideal concentration is 0, carries out zeroing calibrate by this concentration to system, in addition, because in coal pulverizer, coal dust is more, gas in long-time extraction coal pulverizer may block gas inlet to be measured, sweep so need timing to carry out blowback to air intake opening, during anti-purge mode, tee ball valve turns to channel B, anti-purge solenoid valve controls to clean device for drying and filtering by pulsed, the required time of monitor force decay simultaneously, if device for drying and filtering is blocked, then pressure need the time of several seconds (be generally device for drying and filtering unobstructed time five times of die-away time or more) just can decay to initial value, die-away time when if decline of pressure is unobstructed around, then illustrate that device for drying and filtering is unobstructed, blowback can be stopped to sweep.
Sweep to realize automatic back blow, pick-up unit is when installing device for drying and filtering first, record pressure transducer force value is now as reference value, when the decline of pressure time is greater than 5 times (can arrange flexibly in conjunction with concrete condition) of initial decay time, first single-chip microcomputer will send air intake opening blocking warning message, thus starts anti-purge mode.
In addition, pick-up unit of the present utility model has the blocking of detection air intake opening and power down anti-blockage function automatically.Detect that when blowback is swept air intake opening blocks, the first Single-chip Controlling opens alarm relay, then carries out high pressure blowback 1 minute to air intake opening, again detect air intake opening afterwards whether to block, if air intake opening recovers normal, then terminate to report to the police, System recover normally works; If air intake opening still blocks, then continue to repeat above-mentioned blowback 1 minute, detect process, until System recover is normal., it should be noted that, anti-purge solenoid valve is often opened meanwhile, when device power-off, is then in blowback always and sweeps state, and when can ensure system power failure like this, gas inlet to be measured also can not block.
As improvements of the present utility model, because the gas to be measured sucked in measuring chamber contains moisture, and the infrared absorption peak of water vapor and the infrared absorption peak of carbon monoxide have certain coincidence, and lens produce condensate water and can have a certain impact to light path, therefore heating resistor is installed in measuring chamber to remove the condensate water in gas, thus avoid water vapor on the impact of measurement result, improve measuring accuracy and accuracy further.
Particularly, transmitter module is by black matrix infrared light supply, stepper motor and cut mating plate and form, and stepper motor carries out pulsed modulation to infrared light supply.Receiver module is that only paired pulses light has the pyroelectric detector of the band temperature compensation function of response, and adopt binary channels interface, a road is reference channel, and another road is Measurement channel, can save reference gas chamber like this, simplify system architecture, also reduce cost simultaneously.Pyroelectric detector has narrow band pass filter, and can pass through for the infrared light of 3.9-5 micron, reference channel is to 4 microns of infrared light sensitivities, and Measurement channel is to 4.6 microns of infrared light sensitivities.The utility model based on measuring principle be: the infrared absorption spectrum of CO gas is 4.6 microns, and when there being CO gas in measuring chamber, the infrared light intensity of 4.6 microns can weaken, and the infrared light intensity of 4 microns is then unaffected.Can be calculated the concentration of carbon monoxide by the calculating of formula to reference and Measurement channel light intensity, wherein l is light path, I
0for reference channel light intensity, I is Measurement channel light intensity, k
λfor the absorption coefficient of gas, its value depends on gas characteristic and incident wavelength; For same gas, k
λdetermined by incident wavelength.
Control module of the present utility model specifically comprises signal acquisition process unit and the first single-chip microcomputer, first single-chip microcomputer is used for the data that Received signal strength acquisition process unit sends over, calculate carbonomonoxide concentration, the temperature, pressure of control measurement room and the on-off action of control tee ball valve, make device automatically complete blowback and sweep, return to zero and Concentration Testing; Display module comprises second singlechip, LCD display and power circuit.The carbonomonoxide concentration result calculated is sent to second singlechip by the first single-chip microcomputer, and second singlechip is for showing carbonomonoxide concentration, pilot relay warning and checking the measurement parameters such as temperature, pressure.Second singlechip can also carry out 485 with host computer and communicate, and carbonomonoxide concentration can be changed into 4-20mA curve and be shown in real time on the computer of Control Room, the longest monitoring record realizing 30 days carbonomonoxide concentration values.
Be worth special instruction, signal acquisition process unit of the present utility model adopts quadrature modulates circuit, carries out Integral Processing to signal, strong interference immunity, if when there is a faint interference in the external world, the signal after integral filtering is disturbed not quite, can meet the actual needs of industry spot.
Particularly, as shown in Figure 2, signal acquisition process unit comprises: pre-amplification circuit, bandwidth-limited circuit, analog switch, rectification circuit, RC filtering circuit, rearmounted amplifying circuit and A/D change-over circuit.Light signal is changed into ac voltage signal by pyroelectric detector, amplified by pre-amplification circuit and with analog switch, negative value signal is overturn and filtering alien frequencies signal after bandwidth-limited circuit filtering interfering again, analog switch realizes the alternate transport of signal by switching output channel, a normal open walk, a normally closed passage, normally-open normally-close passage is actually and is made up of the N-channel MOS FET of two antithesis and P channel mosfet, and when input end signal is timing, switch switches to normally closed passage; When input signal is for time negative, switching over, to normal open walk, by the switching of analog switch, can realize the alternately output of signal, be overturn by negative value signal, can realize positive and negative AC sine signal to become amplitude be on the occasion of half-wave AC signal; Signal carries out RC filtering again after rectifier circuit rectifies, utilizes the charge-discharge characteristic of electric capacity, selects suitable resistance, electric capacity AC signal can be filtered into stable direct current signal with mu balanced circuit; Direct current signal carries out A/D conversion again after rearmounted amplifying circuit amplifies, and delivers to the first single-chip microcomputer and carry out concentration calculating after converting digital signal to.
In addition, preferred as one, aforementioned first single-chip microcomputer and second singlechip are AVR single chip, are communicated between the two by serial ports, and the signal avoiding collection produces error because of long-distance transmissions.
To sum up, pick-up unit of the present utility model has that accuracy of detection is high, fast response time, maintenance cost are low, the advantage such as little affected by environment, can be widely used in detecting in real time carbonomonoxide concentration in cogeneration plant's coal pulverizer, there is good prospects for commercial application.
More than show and describe ultimate principle of the present utility model, principal character and advantage.The technician of the industry should understand, and above-described embodiment does not limit the utility model in any form, the technical scheme that the mode that all employings are equal to replacement or equivalent transformation obtains, and all drops in protection domain of the present utility model.
Claims (10)
1. a coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus, it is characterized in that, comprise: the cabinet being provided with two air intake openings and a gas outlet, two air intake openings are respectively used to pass into pressurized air and flue gas to be measured, are provided with carbonomonoxide concentration sense channel, automatic zero set (AZS) calibrated channel and the anti-purge passage of anti-clogging in cabinet;
Be provided with in described cabinet transmitter module, receiver module, measuring chamber, by gas extraction to be measured to the air conveyor in measuring chamber, be installed on measuring chamber before tee ball valve, with the anti-purge solenoid valve, control module and the display module that pass into compressed-air actuated air intake opening and be communicated with; Tee ball valve and anti-purge solenoid valve are for realizing the switching between three passages;
The infrared-ray that described transmitter module sends received module after measuring chamber receives, and light signal is converted into electric signal and then sends into the control module be attached thereto by receiver module, and described control module is connected by serial ports with between display module.
2. a kind of coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus according to claim 1, it is characterized in that, described transmitter module is by black matrix infrared light supply, stepper motor and cut mating plate and form, and described stepper motor carries out pulsed modulation to infrared light supply.
3. a kind of coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus according to claim 2, it is characterized in that, described receiver module is that only paired pulses light has the pyroelectric detector of response, adopts binary channels interface, one tunnel is reference channel, and another road is Measurement channel.
4. a kind of coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus according to claim 3, it is characterized in that, described pyroelectric detector there is narrow band pass filter, can pass through for the infrared light of 3.9-5 micron, reference channel is to 4 microns of infrared light sensitivities, and Measurement channel is to 4.6 microns of infrared light sensitivities.
5. a kind of coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus according to claim 1, it is characterized in that, described control module comprises signal acquisition process unit and the first single-chip microcomputer.
6. a kind of coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus according to claim 5, it is characterized in that, described signal acquisition process unit adopts quadrature modulates circuit, comprising: pre-amplification circuit, bandwidth-limited circuit, analog switch, rectification circuit, RC filtering circuit, rearmounted amplifying circuit and A/D change-over circuit; Light signal is changed into ac voltage signal by pyroelectric detector, amplified by pre-amplification circuit and with analog switch, negative value signal is overturn and filtering alien frequencies signal after bandwidth-limited circuit filtering interfering again, signal carries out RC filtering again after rectifier circuit rectifies, AC signal is filtered into stable direct current signal, direct current signal carries out A/D conversion again after rearmounted amplifying circuit amplifies, and delivers to the first single-chip microcomputer after converting digital signal to.
7. a kind of coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus according to claim 6, it is characterized in that, described display module comprises second singlechip, LCD display and power circuit.
8. a kind of coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus according to claim 7, it is characterized in that, described first single-chip microcomputer and second singlechip are AVR single chip, are communicated between the two by serial ports.
9. a kind of coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus according to claim 1, it is characterized in that, a device for drying and filtering is installed at the air intake opening place passing into flue gas to be measured.
10. a kind of coal pulverizer extraction-type carbonomonoxide concentration real-time detection apparatus according to any one of claim 1-9, is characterized in that, is provided with heating resistor and produces condensate water to prevent the gas sucked in described measuring chamber.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132256A (en) * | 2017-06-29 | 2017-09-05 | 苏州曼德克光电有限公司 | A kind of electrochemical process carbonomonoxide concentration detection means |
| CN107941338A (en) * | 2017-11-24 | 2018-04-20 | 上海曜成电子科技有限公司 | A kind of flame detection device, system and method |
| CN111307541A (en) * | 2019-12-19 | 2020-06-19 | 磐安叶层煤矿设备有限公司 | Coal bed drilling gas classification collection device |
| CN112964664A (en) * | 2021-04-08 | 2021-06-15 | 北京泓泰天诚科技有限公司 | Carbon monoxide analyzer and signal processing device thereof |
| CN114926963A (en) * | 2022-05-17 | 2022-08-19 | 西安赢润环保科技集团有限公司 | Point type carbon monoxide detection device and detection method |
-
2014
- 2014-12-26 CN CN201420839268.XU patent/CN204359679U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132256A (en) * | 2017-06-29 | 2017-09-05 | 苏州曼德克光电有限公司 | A kind of electrochemical process carbonomonoxide concentration detection means |
| CN107941338A (en) * | 2017-11-24 | 2018-04-20 | 上海曜成电子科技有限公司 | A kind of flame detection device, system and method |
| CN111307541A (en) * | 2019-12-19 | 2020-06-19 | 磐安叶层煤矿设备有限公司 | Coal bed drilling gas classification collection device |
| CN112964664A (en) * | 2021-04-08 | 2021-06-15 | 北京泓泰天诚科技有限公司 | Carbon monoxide analyzer and signal processing device thereof |
| CN114926963A (en) * | 2022-05-17 | 2022-08-19 | 西安赢润环保科技集团有限公司 | Point type carbon monoxide detection device and detection method |
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Address after: 215300 Kunshan City, Jiangsu province high tech Zone, Fung Road, No. 232, No. Patentee after: Suzhou Mandke photoelectric Co Ltd Address before: 215300 Kunshan City, Jiangsu province high tech Zone, Fung Road, No. 232, No. Patentee before: Suzhou Aodeke Photoelectric Co., Ltd. |