CN107132256A - A kind of electrochemical process carbonomonoxide concentration detection means - Google Patents
A kind of electrochemical process carbonomonoxide concentration detection means Download PDFInfo
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- CN107132256A CN107132256A CN201710514337.8A CN201710514337A CN107132256A CN 107132256 A CN107132256 A CN 107132256A CN 201710514337 A CN201710514337 A CN 201710514337A CN 107132256 A CN107132256 A CN 107132256A
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- magnetic valve
- electrochemical
- detection means
- carbonomonoxide concentration
- concentration detection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/27—Association of two or more measuring systems or cells, each measuring a different parameter, where the measurement results may be either used independently, the systems or cells being physically associated, or combined to produce a value for a further parameter
Abstract
The invention discloses a kind of electrochemical process carbonomonoxide concentration detection means, including constant temperature measurement air chamber, aspiration pump, sample magnetic valve, demarcate magnetic valve, heat refrigeration module, electrochemical signals acquisition module and control system, constant temperature measurement air chamber is provided with inlet channel, inlet channel is provided with aspiration pump and sampling magnetic valve, constant temperature measurement plenum interior is provided with heating refrigeration module, Temperature Humidity Sensor and electrochemical signals acquisition module, demarcation passage is additionally provided with constant temperature measurement air chamber, passage is demarcated provided with demarcation magnetic valve, sample magnetic valve, demarcate magnetic valve, electrochemical signals acquisition module, Temperature Humidity Sensor, heating refrigeration module is connected with control system.The present invention has accuracy of detection high, and fast response time, maintenance cost is low, and less advantage affected by environment can be widely applied to steam power plant's coal pulverizer in the detection of carbonomonoxide concentration.
Description
Technical field
The present invention relates to field of industry detection, and in particular to a kind of electrochemical process carbonomonoxide concentration detection means.
Background technology
Coal pulverizer is a kind of typical fuel crushing system, and coal pulverizer is to be used to manufacture boiler combustion institute in electric heating power plant
The most crucial equipment of coal dust is needed, its work operation conditions is profitability to the economy of whole power plant system and security reliability has important
Influence.Coal pulverizer during grinding powder coal, block coal it is ground and with the oxygen mix in air, along with friction give birth to
Heat, it may occur that incomplete oxidation reaction, so as to produce carbon monoxide.Oxidation reaction heat release promotees to elevate the temperature again, works as temperature
When reaching to a certain degree, spontaneous combustion can occur for coal dust, even set off an explosion.Carbon monoxide early warning can be carried than temperature pre-warning system
It is first 1-1.5 hours, so as to more times exclude dangerous situation to attendant.Therefore, the carbon monoxide gas inside detection coal pulverizer
Bulk concentration is important method for early warning in electric heating power plant.
At present, detection carbon monoxide gas concentration method is numerous both at home and abroad, wherein mainly having electrochemical process, solid-state ionization method
And infrared absorption method.Solid-state ionization method measurement air range is wide, and sensor life-time is long, and principle is simple, but to gas componant
Distinction is poor, and precision is not high enough.Infrared absorption method detects the fast response time of gas, and measurement accuracy is higher, but to air chamber etc.
The requirement of Machine Design is very high, and cost is also very high.Electrochemical method principle is simple, and with low cost, measurement accuracy is higher than optical method,
Because the measuring chamber of this product has temperature incubation function, overcome electrochemical process survey carbon monoxide is influenceed by variation of ambient temperature, and
Air inlet has water treatment plant, reduces influence of the humidity under test gas to Electriochemical measuring sensor, so as to ensure that instrument is long
The stability of time measurement.The device for the coal-grinding machine testing carbon monoxide that the present country is used typically uses external import product,
Not only price is high, and later maintenance is also very complicated, is unfavorable for domestic power plant's large-scale and uses.
The content of the invention
It is high it is an object of the invention to provide a kind of measurement accuracy, stabilization is measured for a long time, it is enclosed, by environment shadow
Sound is small, and the coal pulverizer Carbon Monoxide Detection device of the electrochemical process of advantage of lower cost.
In order to solve the above-mentioned technical problem, the present invention is adopted the following technical scheme that：
A kind of electrochemical process carbonomonoxide concentration detection means, including constant temperature measurement air chamber, aspiration pump, sampling magnetic valve, demarcation
Magnetic valve, heating refrigeration module, electrochemical signals acquisition module and control system, the constant temperature measurement air chamber are logical provided with air inlet
Road, the inlet channel provided with aspiration pump and sampling magnetic valve, the constant temperature measurement plenum interior provided with heating refrigeration module,
It is also associated with demarcating passage, the demarcation passage on Temperature Humidity Sensor and electrochemical signals acquisition module, the inlet channel
Provided with demarcation magnetic valve, the sampling magnetic valve, demarcation magnetic valve, electrochemical signals acquisition module, Temperature Humidity Sensor, plus
Refrigeration heat module is connected with the control system.
Preferably, the electrochemical signals acquisition module includes carbon monoxide electrochemical probe and oxygen electrochemistry is visited
Head.
Preferably, the air inlet of the inlet channel is additionally provided with particulate filter.
Preferably, being also associated with blowback passage on the inlet channel, the blowback passage is provided with blowback magnetic valve,
The blowback magnetic valve is connected with the control system, and the end of the blowback passage is provided with compressed air inlet.
Preferably, the junction of the blowback passage and inlet channel is located at the sampling magnetic valve and particulate filter
Between.
Preferably, the blowback magnetic valve is pulse-controlled electromagnetic valve.
Preferably, being additionally provided with pressure sensor in the inlet channel, the pressure sensor is located at particulate filter
Between blowback passage.
Preferably, being additionally provided with dehydrater on the inlet channel.
Preferably, the control system includes single-chip microcomputer one, single-chip microcomputer two and input/output unit, the single-chip microcomputer one
It is connected with the sampling magnetic valve, demarcation magnetic valve, electrochemical signals acquisition module, Temperature Humidity Sensor, heating refrigeration module,
The single-chip microcomputer two is connected with input/output unit, and information can be mutually transmitted between the single-chip microcomputer one and single-chip microcomputer two.
Preferably, the input/output unit includes input keyboard and display screen, the input keyboard and display screen are equal
It is connected with the single-chip microcomputer two.
The beneficial effects of the invention are as follows：
1st, under test gas is extracted using the aspiration pump of energy constant rate of speed, it is to avoid constant temperature measurement gas room pressure changes to measurement result
Influence.2nd, by the way of high temperature is kept to constant temperature measurement air chamber, the under test gas to suction is heated, it is to avoid gas to be measured
Body produces condensed water in measuring chamber, reduces influence of the condensed water to measurement result.3rd, the AF3 systems of Apollo companies are used
The electrochemical probe of row, not only precision is good, and long lifespan.4. the interaction of three magnetic valves, can be automatically performed system
Detection under test gas concentration, anti-clogging blowback are swept and returned to zero calibration.5 use the work of stm32 single-chip microcomputers, relative to general
Single-chip microcomputer such as AVR, processing speed is faster, more stable, with can causing system operation more smooth.6th, used due to the present invention
Magnetic valve, single-chip microcomputer, aspiration pump, heating refrigeration module etc. are conventional devices, greatly reduce cost and later maintenance into
This.The present invention has accuracy of detection high（Opposing optical method is much higher）, fast response time, maintenance cost is low, it is affected by environment compared with
Small advantage, can be widely applied to steam power plant's coal pulverizer in the detection of carbonomonoxide concentration.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the workflow diagram of the present invention.
Reference numerals list：
1- constant temperature measurement air chambers；2- inlet channels；3- electrochemical signals acquisition modules；4- Temperature Humidity Sensors；5- heating refrigeration
Module；6- aspiration pumps；7- samples magnetic valve；8- blowback passages；9- blowback magnetic valves；10- demarcates passage；11- demarcates magnetic valve；
12- particulate filters；13- dehydraters；14- air inlets；15- compressed air inlets；31- carbon monoxide electrochemical probes, 32- oxygen
Pneumoelectric chemical probe.
Embodiment
The invention will be further described with reference to the accompanying drawings and detailed description：
As shown in Figure 1 and Figure 2, a kind of electrochemical process carbonomonoxide concentration detection means, including constant temperature measurement air chamber 1, aspiration pump 6,
Sample magnetic valve 7, demarcation magnetic valve 11, heating refrigeration module 5, electrochemical signals acquisition module 3 and control system, constant temperature measurement
Air chamber 1 is provided with inlet channel 2, and inlet channel 2 is provided with aspiration pump 6 and sampling magnetic valve 7, constant temperature measurement air chamber 1 and also set
There is gas outlet 16, the inside of constant temperature measurement air chamber 1 is provided with heating refrigeration module 5, Temperature Humidity Sensor 4 and electrochemical signals collection mould
It is also associated with demarcating passage 10 on block 3, inlet channel 2, demarcation passage 10, which is provided with, demarcates magnetic valve 11, sampling magnetic valve 7,
Demarcation magnetic valve 11, electrochemical signals acquisition module 3, Temperature Humidity Sensor 4, heating refrigeration module 5 are connected with control system.
Electrochemical signals acquisition module 3 includes carbon monoxide electrochemical probe 31 and oxygen electrochemical probe 32.Also set on inlet channel 2
There is dehydrater 13.
The accuracy of measurement is influenceed in order to prevent impurity from entering constant temperature measurement air chamber 1, the air inlet 14 of inlet channel 2 is also
Provided with particulate filter 12.
In order to prevent the air inlet 14 of inlet channel 2 from blocking, blowback passage 8, blowback passage are also associated with inlet channel 2
8 are provided with blowback magnetic valve 9, and blowback magnetic valve 9 is connected with control system, and the end of blowback passage 8 is provided with compressed air inlet
15.The junction of blowback passage 8 and inlet channel 2 is located between sampling magnetic valve 7 and particulate filter 12.Blowback magnetic valve 9
For pulse-controlled electromagnetic valve.Pressure sensor is additionally provided with inlet channel 2, pressure sensor is located at particulate filter 12 and led to blowback
Between road 8.
Control system includes single-chip microcomputer one, single-chip microcomputer two and input/output unit, single-chip microcomputer one and sampling magnetic valve 7, anti-
Magnetic valve 9, demarcation magnetic valve 11, electrochemical signals acquisition module 3, Temperature Humidity Sensor 4, heating refrigeration module 5 is blown to be connected, it is single
Piece machine two is connected with input/output unit, and information can be mutually transmitted between single-chip microcomputer one and single-chip microcomputer two.Input/output unit bag
Input keyboard and display screen are included, input keyboard and display screen are connected with single-chip microcomputer two.
The data collected are transmitted to single-chip microcomputer one by electrochemical signals acquisition module 3；The effect of single-chip microcomputer one be by temperature,
Humidity, CO concentration and O2Concentration is transmitted to display screen and single-chip microcomputer two and remote monitoring room is communicated, monitors constant temperature measurement air chamber
1 temperature and controlling, which heats refrigeration module 5 and heats or freeze, keeps the constant temperature of constant temperature measurement air chamber 1, three magnetic valves of control to lead to
It is disconnected, control aspiration pump 6 to start or stop work and export the corresponding 4-20Ma electric currents of measurement gas concentration.Single-chip microcomputer two
The data transmitted according to single-chip microcomputer one, control display screen shows carbonomonoxide concentration value, oxygen density value, is set by inputting keyboard
Automatic calibration returns to zero, checks the measurement parameters such as temperature, pressure.
The single-chip microcomputer one and single-chip microcomputer two used in this example is stm32 single-chip microcomputers, the He of carbon monoxide electrochemical probe 31
The model of oxygen electrochemical probe 32 is the CO-AF3 and O of Apollo companies respectively2- AF3, this two probe not only measures essence
Degree was high, and long lifespan, up to more than 3 years, it is to avoid need often to change the shortcoming of probe relative to old-fashioned electrochemistry.
The application method and operation principle of the present invention is as follows：
When detecting carbonomonoxide concentration in coal pulverizer using the present invention, first by the entrance of inlet channel 2 with being connected inside coal pulverizer,
During measurement, blowback magnetic valve 9 and demarcation magnetic valve 11 are closed, and sampling magnetic valve 7 is opened, in the presence of aspiration pump 6, coal pulverizer
Interior under test gas is slowly equably drawn into constant temperature measurement air chamber 1, and particulate filter 12 can fall pulverized-coal filtering.So
The water that dehydrater 13 is drawn into the gas come afterwards is removed, and reduction is pumped into the humidity of gas, reduces water and electrochemical probe is surveyed
The influence of amount.In constant temperature measurement air chamber 1, the temperature in constant temperature measurement air chamber 1 is controlled using heating refrigeration module 5,
Monitor the temperature in constant temperature measurement air chamber 1 in real time by Temperature Humidity Sensor 4 and transfer data to control system, be by control
System is controlled to keep the temperature in constant temperature measurement air chamber 1 constant to heating refrigeration module 5 in time, it is ensured that the essence of measurement
Degree.
Because coal dust is more in coal pulverizer, the gas extracted for a long time in coal pulverizer may block air inlet 14, so
Need timing to carry out blowback to air inlet 14 to sweep.Demarcation magnetic valve 11 and sampling magnetic valve 7 are closed, and blowback magnetic valve 9 is opened, instead
Blow magnetic valve 9 to clean particulate filter 12 by " pulsed " control, while the time required to monitoring decline of pressure；If
Particulate filter 12 is not clean, and pressure value needs the time of several seconds（Usually " clean " five times of die-away time）It can just decay to
Initial value.Time needed for decline of pressure additionally depends on the length and diameter of sampling line, therefore, and system is installing particle first
When filter 12 is cleaned, record pressure sensor pressure value now and initial decay time are used as benchmark.When decline of pressure
Between when being more than 5 times of the initial decay time, single-chip microcomputer one sends the warning message of the blocking of air inlet 14.
In use, it is sometimes desirable to carry out zeroing calibration to device, when returning to zero calibration mode, blowback magnetic valve 9
Closed with sampling magnetic valve 7, demarcation magnetic valve 11 is opened, and outside air is drawn into constant temperature measurement air chamber 1, now measuring chamber
Concentration is zero, and system is calibrated according to concentration now.
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned embodiment, in addition to
Constituted technical scheme is combined by above technical characteristic.It should be pointed out that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of electrochemical process carbonomonoxide concentration detection means, it is characterised in that including constant temperature measurement air chamber, aspiration pump, take
Sample magnetic valve, demarcation magnetic valve, heating refrigeration module, electrochemical signals acquisition module and control system, the constant temperature measurement gas
Room is provided with inlet channel, and the inlet channel is set provided with aspiration pump and sampling magnetic valve, the constant temperature measurement plenum interior
Have and be also associated with demarcating logical on heating refrigeration module, Temperature Humidity Sensor and electrochemical signals acquisition module, the inlet channel
Road, the demarcation passage provided with demarcation magnetic valve, the sampling magnetic valve, demarcation magnetic valve, electrochemical signals acquisition module,
Temperature Humidity Sensor, heating refrigeration module are connected with the control system.
2. electrochemical process carbonomonoxide concentration detection means as claimed in claim 1, it is characterised in that the electrochemical signals
Acquisition module includes carbon monoxide electrochemical probe and oxygen electrochemical probe.
3. electrochemical process carbonomonoxide concentration detection means as claimed in claim 1 or 2, it is characterised in that the air inlet is led to
The air inlet in road is additionally provided with particulate filter.
4. electrochemical process carbonomonoxide concentration detection means as claimed in claim 3, it is characterised in that on the inlet channel
Blowback passage is also associated with, the blowback passage is provided with blowback magnetic valve, and the blowback magnetic valve connects with the control system
Connect, the end of the blowback passage is provided with compressed air inlet.
5. electrochemical process carbonomonoxide concentration detection means as claimed in claim 4, it is characterised in that the blowback passage with
The junction of inlet channel is located between the sampling magnetic valve and particulate filter.
6. the electrochemical process carbonomonoxide concentration detection means as described in claim 4 or 5, it is characterised in that the blowback electricity
Magnet valve is pulse-controlled electromagnetic valve.
7. electrochemical process carbonomonoxide concentration detection means as claimed in claim 6, it is characterised in that in the inlet channel
Pressure sensor is additionally provided with, the pressure sensor is located between particulate filter and blowback passage.
8. electrochemical process carbonomonoxide concentration detection means as claimed in claim 1 or 2, it is characterised in that the air inlet is led to
Dehydrater is additionally provided with road, the dehydrater is located between the air inlet of inlet channel and sampling magnetic valve.
9. electrochemical process carbonomonoxide concentration detection means as claimed in claim 1 or 2, it is characterised in that the control system
System includes single-chip microcomputer one, single-chip microcomputer two and input/output unit, the single-chip microcomputer one and the sampling magnetic valve, demarcation electromagnetism
Valve, electrochemical signals acquisition module, Temperature Humidity Sensor, heating refrigeration module are connected, and the single-chip microcomputer two is filled with input and output
Put connected, information can be mutually transmitted between the single-chip microcomputer one and single-chip microcomputer two.
10. electrochemical process carbonomonoxide concentration detection means as claimed in claim 9, it is characterised in that the input and output
Device includes input keyboard and display screen, and the input keyboard and display screen are connected with the single-chip microcomputer two.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710514337.8A CN107132256A (en) | 2017-06-29 | 2017-06-29 | A kind of electrochemical process carbonomonoxide concentration detection means |
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| CN201710514337.8A CN107132256A (en) | 2017-06-29 | 2017-06-29 | A kind of electrochemical process carbonomonoxide concentration detection means |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109210563A (en) * | 2018-09-04 | 2019-01-15 | 华电电力科学研究院有限公司 | A kind of new device and its working method explosion-proof for the ball type pulverizer system pulverized coal bin |
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| CN206945597U (en) * | 2017-06-29 | 2018-01-30 | 苏州曼德克光电有限公司 | A kind of electrochemical process carbonomonoxide concentration detection means |
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Patent Citations (7)
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| CN101368921A (en) * | 2008-09-08 | 2009-02-18 | 无锡尚沃生物科技有限公司 | High sensitivity and high-selective gas transducer |
| CN202854036U (en) * | 2012-10-10 | 2013-04-03 | 南京达凯电力自动化设备有限公司 | Carbon monoxide concentration on-line detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109210563A (en) * | 2018-09-04 | 2019-01-15 | 华电电力科学研究院有限公司 | A kind of new device and its working method explosion-proof for the ball type pulverizer system pulverized coal bin |
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