CN1114415A - Sensor for measuring carbon content in boiler flyash and use thereof - Google Patents
Sensor for measuring carbon content in boiler flyash and use thereof Download PDFInfo
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- CN1114415A CN1114415A CN 94112176 CN94112176A CN1114415A CN 1114415 A CN1114415 A CN 1114415A CN 94112176 CN94112176 CN 94112176 CN 94112176 A CN94112176 A CN 94112176A CN 1114415 A CN1114415 A CN 1114415A
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Abstract
Two sensors with loading window or loading window plus piston and microwave resonant cavity for monitoring combustion condition of boiler in steam-power plant are disclosed. It is used along with microwave measuring circuit to in-line measure the carbon content in boiler flyash statically or in real-time mode, and features high sensitivity and not being polluted by ash.
Description
The present invention relates to two kinds of sensors of measuring boiler flyash carbon content and uses thereof, belong to the microwave measurement field of sensing technologies.
A carbon content that important symbol is a flying dust of fuel-burning power plant coal-burning boiler burning efficiency height, the low explanation of carbon content burning efficiency height.The fuel-burning power plant widespread usage is the sampling inustion at present, promptly takes out 1 gram and be placed on the high temperature kiln roasting 2 hours from the boiler fly ash sample of gathering, and burns carbon wherein, is measured the carbon content of sample by weight method.The shortcoming of this method is that sample representation is poor, and the time is long, can not realize real-time online measuring.In recent years, domestic some generating plant begins to adopt WCT-2 type microwave carbonmeter, and its Sensor section is made up of a pair of transmission loudspeaker quartz ampoule middle with being positioned at their.Quartz ampoule is used for gathering the boiler fly ash sample.The carbon content of boiler fly ash sample is many more, and the loss of microwave signal between two transmission loudspeaker is just big more, can measure the carbon content of boiler fly ash sample in view of the above.In actual applications, it is not high that this measurement mechanism exists measurement sensitivity, and quartzy pipe plug ash brings difficult in maintenance, can not realize shortcomings such as real-time online measuring.
The object of the present invention is to provide a kind of shortcoming that background technology has of having overcome, load the sensor of the measurement boiler flyash carbon content that the microwave cavity of window constitutes by band.
Another object of the present invention is to provide a kind of sensor that is loaded the measurement boiler flyash carbon content that the microwave cavity of window constitutes by the band that contains piston.
Another object of the present invention is to provide a kind of purposes of the sensor, with the sensor boiler flyash carbon content is carried out static measurement.
Another object of the present invention is to provide a kind of sample box that need use when doing above-mentioned static measurement.
Another object of the present invention is to provide the purposes of another kind of the sensor, with the sensor boiler flyash carbon content is carried out real-time online measuring.
Resonance indicator reading-boiler flyash carbon content relation curve of providing one need use when making above-mentioned static state or real-time online measuring is provided another object of the present invention.
Fig. 1 is the cut-open view of the sensor (prototype) that the present invention relates to, and wherein (1) is cavity, and (3) are to load window, and (4) are spacers, and (5) are the microwave input ports, and (6) are the microwave delivery outlets.
Fig. 2 is a kind of modification of the sensor that the present invention relates to, contain piston sensor cut open condition figure, wherein (2) are pistons.
Fig. 3 is the annex of the sensor that the present invention relates to, the cut-open view of sample box, and wherein (7) are the box walls, (8) are the grey chambeies of storage, at the bottom of (9) are box.
Fig. 4 is a synoptic diagram of doing the static measurement of boiler fly ash sample carbon content with the sensor that the present invention relates to, wherein (10) are the boiler fly ash samples, (11) be microwave signal source, (12) be signal isolator, (13) be level attenuator, (14) be wave detector, (15) are direct current amplifiers, and (16) are resonance indicators.
Fig. 5 is a synoptic diagram of making the real-time online measuring of boiler flyash carbon content with the sensor that the present invention relates to, and wherein (17) are the ash discharging pipe roads, and (18) are thieff hatchs.
Fig. 6 is resonance indicator reading-boiler flyash carbon content relation curve.
The sensor that the present invention relates to mainly is by cavity (1), loads window (3), spacer (4), microwave input port (5), microwave delivery outlet (6) is formed.Cavity (1) is one to be made by metal materials such as copper or aluminium, columniform, resonance frequency X-band (8500-10,000MHZ), internal diameter and highly be respectively the microwave cavity of 25-28mm and 45-50mm.The sidewall of cavity (1) has microwave input port (5), and its opposite side wall has microwave delivery outlet (6).The diameter of microwave input port (5) and microwave delivery outlet (8) is 4-6mm.The roof of cavity (1) has and loads window (3), and the diameter of roof thickness and loading window (3) is respectively 0.5-1.5mm and 5-10mm.Spacer (4) is that thickness is 0.1-1.0mm, is made as high-frequency ceramic and so on material by the high-frequency dielectric of anti-250 ℃ of high temperature, covers the thin rounded flakes that loads window (3).
Sample box is the annex of the sensor that the present invention relates to, by box wall (7), stores grey chamber (8), and (9) are formed at the bottom of the box.Box wall (7) is one section is made by metal materials such as copper or aluminium, and height and internal diameter are respectively 40-50mm and 10-12mm, and complete section is processed into funnelform circular pipe wide at the top and narrow at the bottom it on.Storing grey chamber (8) is the space that box wall (7) surrounds.(9) are that thickness is the thin slice that the high-frequency dielectric of 0.05-0.2mm such as terylene and so on material is made at the bottom of the box, and adhere to box wall (7) lower end, seal opening.
A kind of purposes of the sensor that the present invention relates to is the carbon content of coming static measurement boiler fly ash sample with this sensor.For this reason, sensor vertically (end face up) is placed, be connected with the microwave measurement circuit with microwave delivery outlet (6) by microwave input port (5): microwave signal source (11), signal isolator (12) is connected with microwave input port (5) by microwave plumbing (not marking) with level attenuator (13), wave detector (14), direct current amplifier (15) is connected with microwave delivery outlet (6) by microwave plumbing (not marking) with resonance indicator (16).Microwave signal source (11) is frequency adjustable microwave signal generator in X-band.Resonance indicator (16) is linear DC voltage table or reometer, and scale is evenly marked into 100 lattice.An empty sample box is placed on the end face of sensor, and sample box overlaps each other with the central axis of sensor.Spacer (4) can remove need not, replace by (9) at the bottom of the box.
The measuring operation step:
The first step is tuning.Regulate microwave signal source (11) repeatedly in turn and send the frequency of signal and the attenuation rate of level attenuator (13), when sensor and this signal generation resonance, the reading of resonance indicator (16) just in time is full scale (100 lattice).
Second step added sample.Boiler fly ash sample (10) is filled the storage ash chamber (8) of sample box, the interior boiler fly ash sample (10) in (9) and sample box is coupled microwave signal in the sensor at the bottom of window (3) and the box by loading, the energy of the microwave signal in boiler fly ash sample (10) Absorbing Sensor, become the load of sensor, cause the microwave signal amplitude of microwave delivery outlet (6) output to reduce, the output signal of wave detector (14), the reading of the output signal of direct current amplifier (15) and resonance indicator (16) reduces thereupon.The energy that boiler fly ash sample (10) absorbs is many more, and the reading of resonance indicator (16) is more little; Vice versa.The non-linear relation of reading of the carbon content of boiler fly ash sample (10) and resonance indicator (16), but can demarcate with the known boiler fly ash sample (10) of carbon content.Once demarcation,, just can determine the carbon content of boiler fly ash sample (10) as long as know the reading of resonance indicator (16).
The 3rd step was read the reading of resonance indicator (16).
The 4th step according to read the reading of resonance indicator (16), find the carbon content of boiler fly ash sample (10) from resonance indicator (16) reading-boiler flyash carbon content relation curve (Fig. 6).
Resonance indicator (16) reading-boiler flyash carbon content relation curve is depicted as like this.With above-mentioned static measurement method the known boiler fly ash sample (10) of N kind carbon content is carried out N time respectively and measure, write down the reading of each resonance indicator (16).Utilize inustion mentioned above to measure the carbon content of above-mentioned N kind boiler fly ash sample (10), then the data rows of gained is become resonance indicator (16) reading-boiler flyash carbon content table of comparisons.Utilize listed data in the table, on square paper, draw the relation curve of resonance indicating gauge (16) reading-boiler flyash carbon content, wherein abscissa represents that (unit: lattice), ordinate is represented boiler flyash carbon content (unit: %) to resonance indicator (16) reading.The number of the boiler fly ash sample (10) that carbon content is known is the amount doesn't matter, and because of number is many more, the curve of drawing is accurate more, so number should not be less than 9, to guarantee the degree of accuracy of curve.Utilize resonance indicator (16) reading of the boiler fly ash sample of 9 kinds of known carbon content that the static measurement method records, be arranged in that resonance indicator (16) reading-the boiler flyash carbon content table of comparisons is as follows, the relation curve that plots as shown in Figure 6.
| Carbon content (%) | 0????0.64????2.46????5.18????6.5????7.69????9.19????10.6????12.7 |
| Reading (lattice) | 100??98??????88??????57??????40?????29??????19??????11??????1 |
The another kind of purposes of the sensor that the present invention relates to is to come boiler fly ash sample carbon content is carried out real-time online measuring with this sensor.For this reason, need are opened the thieff hatch that diameter is 40-60mm (18) at the sidewall in the ash discharging pipe road (17) of boiler chimney, under the loading window (3) that is stamped spacer (4) and situation that thieff hatch (18) is aimed at, sensor is close to and is fixed on the sidewall of ash discharging pipe road (17).Microwave input port (5) and microwave delivery outlet (8) are connected with the microwave measurement circuit, and be identical during with static measurement.
The measuring operation step also comprised for four steps, and the corresponding steps when wherein the three, four step is with static measurement is identical, had only for the first, two step needed explanation slightly.
The first step is tuning.Answer the boiler fly ash of lining, emptying ash discharging pipe road (17) when tuning, the first step when other operation stepss and static measurement is identical.
Second step added sample.The boiler fly ash that sample flows through from spacer (4) exactly, so the boiler fly ash sample (10) that it is placed in the sample box during to the influence of sensor and static measurement is identical to the influence of sensor, be applicable to the relation curve of resonance indicator (16) reading-boiler flyash carbon content of static measurement, also be applicable to real-time online measuring.
The invention still further relates to the sensor that contains piston, this sensor is the modification of the sensor (prototype).Compare with prototype, its cavity (1) no diapire, microwave cavity is 40-60mm, is equipped with in the chamber by metal materials such as copper or aluminium to make, diameter is slightly smaller than the microwave cavity diameter, can paste the moving piston (2) of chamber wall shift of microwave cavity.Other structures of this sensor and prototype identical.
The sensor that contains piston can be used to the carbon content of static state or real-time online measuring boiler fly ash sample, during measurement, microwave measurement circuit and sample box with its coupling, its placement and installation, the connected mode and the measuring operation step (except the first step) of it and microwave measurement circuit, all identical when carrying out identical measurement with prototype.When the first step of measuring operation step, microwave signal source (11) sends a signal that frequency is constant, sensor is tuning change by repeatedly in turn regulating piston (2) in microwave cavity the position and the attenuation rate of level attenuator (13) realize.
Compare with background technology, the present invention has following advantage and good effect:
1. highly sensitive.When the sensor that the present invention relates to is used for the measurement of carbon content of boiler fly ash, be under the resonant condition, the carbon content of boiler fly ash sample slightly changes, the resonant condition of sensor just can be subjected to tangible influence, and with the form of the reading significant change of resonance indicator (16) this influence is reflected.
2. maintaining is easy.Separated (9) at the bottom of spacer (3) or box were arranged between the microwave cavity of boiler fly ash sample (10) and sensor cavity (1), microwave channel does not intersect mutually with the boiler fly ash passage, stopped that boiler fly ash sample (10) enters sensor cavity (1) and polluted microwave cavity, prevented the generation of clogging phenomenon, made the maintaining of sensor become easy.
3. can realize the real-time online measuring of boiler flyash carbon content with the sensor that the present invention relates to, this is the measurement project that background technology be can not be completed.
The present invention is specially adapted to be used for monitoring the heat power plant boiler combustion case, helps to make burning more abundant, more complete, improves burning efficiency, and the fuel saving consumption is eliminated chimney " black dragon " and reduce environmental pollution.The present invention can also further combine with microcomputer technology, forms automatic boiler combustion control system, realizes the boil combustion control robotization.So the present invention is important, rising energy-conserving and environment-protective product in the thermal power generation field.
Claims (6)
1. sensor of measuring boiler flyash carbon content, mainly by cavity (1), load window (3), spacer (4), microwave input port (5), microwave delivery outlet (6) is formed, it is characterized in that cavity (1) is one and is made by metal materials such as copper or aluminium, columniform, the microwave cavity of resonance frequency in X-band (8500-10000MHz) scope, internal diameter and highly be respectively 25-28mm and 45-50mm, the sidewall of cavity (1) has microwave input port (5), its opposite has microwave delivery outlet (6), and the diameter of microwave input port (5) and microwave delivery outlet (6) is 4-6mm.The roof of cavity (1) has and loads window (3), the diameter of roof thickness and loading window (3) is respectively 0.5-1.5mm and 5-10mm, spacer (4) is that a slice thickness is 0.1-1.0mm, high-frequency dielectric by anti-250 ℃ of high temperature is made as high-frequency ceramic and so on material, covers the thin rounded flakes that loads window (3).
2. the modification of the sensor (prototype) of the described measurement boiler flyash carbon content of claim 1, the no diapire of cavity (1) that it is characterized in that it, the microwave cavity height is 40-60mm, be equipped with in the chamber and make by metal materials such as copper or aluminium, diameter is slightly smaller than the microwave cavity diameter, can paste the moving piston (2) of chamber wall shift of microwave cavity, its other structures and prototype are identical.
3. the annex of the sensor of claim 1 or 2 described measurement boiler flyash carbon contents, be one by box wall (7), store grey chamber (8), the sample box that (9) are formed at the bottom of the box, it is characterized in that box wall (7) is one section circular pipe of being made by metal materials such as copper or aluminium, height and internal diameter are respectively 40-50mm and 10-12mm, upper semisection is processed into funnel-form, storing grey chamber (8) is the space that box wall (7) surrounds, (9) are that thickness is 0.05-0.2mm at the bottom of the box, make as terylene and so on macromolecular material by high-frequency dielectric, adhere to box wall (7) lower end, seal the thin slice of opening.
4. a kind of purposes of the sensor of claim 1 or 2 described measurement boiler flyash carbon contents, for this reason, this sensor and sample box and the coupling of microwave measurement circuit, be used for the carbon content of static measurement boiler fly ash sample (10), it is characterized in that vertically (roof up) placement of sensor, be placed with an empty sample box on the end face of this sensor, the central axis of this sensor overlaps each other with the central axis of sample box, this sensor is connected with the microwave measurement circuit with microwave delivery outlet (6) by microwave input port (5): microwave signal source (11), signal isolator (12) is connected with microwave input port (5) by microwave plumbing with level attenuator (13), wave detector (14), direct current amplifier (15) is connected with microwave delivery outlet (6) by microwave plumbing with resonance indicator (16), the frequency of microwave signal source (11) is adjustable in the x wave band, resonance indicator (16) is a linear DC voltage table or reometer, scale is evenly marked into 100 lattice, spacer (4) can be removed need not, replace the measuring operation step by (9) at the bottom of the box:
The first step such as sensor are prototype, regulate microwave signal source (11) repeatedly in turn and send the frequency of signal and the attenuation rate of level attenuator (13), when the signal generation resonance of sensor and this frequency, the reading of resonance indicator (16) just in time is full scale (100 lattice), as sensor is modification, microwave signal source (11) sends a signal that frequency is constant, the in turn position of regulating piston (2) in microwave cavity and the attenuation rate of level attenuator (13) repeatedly, when sensor and this signal generation resonance, the reading of resonance indicating gauge (16) just in time is full scale (100 lattice);
Second goes on foot the storage ash chamber (8) that boiler fly ash sample (10) is filled sample box, and the reading of resonance indicator (16) reduces;
The 3rd step was read the reading of resonance indicator (16);
The 4th step according to read the reading of resonance indicator (16), find the carbon content of boiler fly ash sample (10) from resonance indicator (16) reading one boiler flyash carbon content relation curve.
5. another purposes of the sensor of claim 1 or 2 described measurement boiler flyash carbon contents, for this reason, the ash discharging pipe road (17) of this sensor and boiler chimney and the coupling of microwave measurement circuit, be used for the carbon content of real-time online measuring boiler fly ash sample (10), it is characterized in that opening a diameter on the sidewall in ash discharging pipe road (17) of boiler chimney is 40-60mm thieff hatch (18), under the loading window (3) that is stamped spacer (4) and situation that thieff hatch (18) is aimed at, sensor is close to and is fixed on the sidewall of ash discharging pipe road (17), microwave input hole (5) and microwave delivery outlet (6) are connected with the microwave measurement circuit, identical during with static measurement, the measuring operation step:
Answer the boiler fly ash of lining, emptying ash discharging pipe road (17) when the first step is tuning, the first step when other operation stepss and static measurement is identical;
The second step boiler fly ash flows through from spacer (4), and the reading of resonance indicator (16) reduces;
In the 3rd step, the corresponding steps when the 4th step and static measurement is identical.
6. according to the purposes of the sensor of claim 4 or 5 described measurement boiler flyash carbon contents, the relation curve that it is characterized in that resonance indicator (16) reading-boiler flyash carbon content is according to following resonance indicator (16) reading-boiler flyash carbon content table of comparisons:
Carbon content (%) 0??????0.64????2.46????5.18?????6.5????7.69????9.19?????10.6????12.7
Reading (lattice) 100????98??????88??????57???????40?????29??????19???????11??????1
The data that provide are drawn, and the abscissa of relation curve represents that (unit: lattice), ordinate is represented boiler flyash carbon content (unit: %) to resonance indicator (16) reading.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94112176 CN1058570C (en) | 1994-05-21 | 1994-05-21 | Sensor for measuring carbon content in boiler flyash and use thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94112176 CN1058570C (en) | 1994-05-21 | 1994-05-21 | Sensor for measuring carbon content in boiler flyash and use thereof |
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| Publication Number | Publication Date |
|---|---|
| CN1114415A true CN1114415A (en) | 1996-01-03 |
| CN1058570C CN1058570C (en) | 2000-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94112176 Expired - Fee Related CN1058570C (en) | 1994-05-21 | 1994-05-21 | Sensor for measuring carbon content in boiler flyash and use thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784725A (en) * | 2016-04-22 | 2016-07-20 | 中北大学 | Device and method for extracting chemical parameters in harsh environment |
| CN111511880A (en) * | 2017-12-26 | 2020-08-07 | 株式会社Posco | Attached mineral measuring device of coke bin |
-
1994
- 1994-05-21 CN CN 94112176 patent/CN1058570C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784725A (en) * | 2016-04-22 | 2016-07-20 | 中北大学 | Device and method for extracting chemical parameters in harsh environment |
| CN111511880A (en) * | 2017-12-26 | 2020-08-07 | 株式会社Posco | Attached mineral measuring device of coke bin |
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| Publication number | Publication date |
|---|---|
| CN1058570C (en) | 2000-11-15 |
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