CN212513860U - Fly ash carbon content rapid measurement device with automatic calibration function - Google Patents
Fly ash carbon content rapid measurement device with automatic calibration function Download PDFInfo
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Abstract
The invention provides a fly ash carbon content quick measuring device with an automatic calibration function, which comprises a sampling unit, a microwave measuring unit, a feeding unit, an ash sample transmission unit, a powder returning unit, a firing fly ash measuring instrument and a program controller, wherein the microwave measuring unit comprises a microwave measuring tube, an ash level sensor, a microwave resonant cavity and a microwave frequency sweep measuring instrument, the feeding unit comprises a motor feeder and an ash sample discharging tube, the ash sample transmission unit comprises a discharging ash storage tube, a middle ash storage chamber and a sample adding tube, and the powder returning unit comprises an ash discharging electromagnetic valve, a jet air extractor, a jet electromagnetic valve and a powder returning port. Simple structure, convenient to use, measurement accuracy is high and accurate, returns the flue with remaining flying dust simultaneously, avoids polluting the site environment, and can be applicable to non-flue sample measurement flying dust carbon content.
Description
Technical Field
The invention belongs to the field of automatic detection equipment of thermal power plants, and particularly relates to a fly ash carbon content rapid measurement device with an automatic calibration function.
Background
The height of unburned carbon in the fly ash of the boiler in the thermal power plant is an important index of the combustion efficiency of the boiler, and has a great value for adjusting the combustion of the boiler. Different technical routes are adopted for developing online measurement of unburned carbon content at home and abroad for years, and the key problems are that the detection precision is generally unsatisfactory, the measurement period is long, the measurement precision cannot be guaranteed, the equipment reliability is poor and the like. Especially, the detection methods of infrared, microwave, capacitance and the like are indirect measurement, carbon content numerical values need to be obtained through a calibration curve, parameters such as the type of coal for combustion or the particle size of fly ash and the like need to be calibrated again when the parameters change, and the actual situation is that the type of coal for combustion of a power plant cannot be single and unchanged, generally, the power plant adopts 6-7 types of coal, even more than ten types of coal, so that the product cannot adapt to the change of the type of coal when used on site, and the use value of the product is limited.
The invention of the patent by Nanjing Dada science and technology Limited company in recent years: a device ZL200910232825.5 for measuring carbon by burning fly ash in boiler is a direct measurement method by adopting laboratory analysis process and method, solves the problem of detection accuracy of on-line carbon content, but has long measurement period, and generally needs about 20 minutes.
The large power station boiler adopts a pulverizing system to mill coal blocks into pulverized coal, and blows a mixture of air and the pulverized coal into a hearth through an air supply system for combustion, so that the combustion is abnormally rapid, the combustion of the pulverized coal is a complex physical and chemical process, pulverized coal parameters, air quantity parameters, distribution proportions and the like fed into the hearth of the boiler need to be mastered in time, and the quality of the combustion is directly reflected on the height of unburned carbon in fly ash.
The measurement period of the existing indirect measurement method is generally 3-5 minutes, and the measurement precision cannot be guaranteed. And the measurement period of the high-precision burning method based on the laboratory needs about 20 minutes. How to realize the measurement accuracy required by the market is not influenced by the change of coal types, and the method for rapidly measuring the carbon content in the fly ash (with the measurement period of 10-20 seconds) becomes a difficult problem in the field of boiler measurement and control.
Disclosure of Invention
The invention aims to provide a fly ash carbon content quick measuring device with an automatic calibration function, which has the advantages of simple structure, convenient use, high and accurate measurement precision, and can return the residual fly ash to a flue to avoid polluting the field environment, thereby being suitable for non-flue sampling measurement of the fly ash carbon content.
The technical solution for realizing the purpose of the invention is as follows:
the utility model provides a flying dust carbon content quick measuring device with automatic calibration function, includes sampling unit, microwave measuring unit, feed unit, ash sample transmission unit, returns whitewashed unit, firing flying dust measuring apparatu and program controller, wherein: the sampling unit adopts a self-drawing sampler without external power or other power drawing samplers, one end of the sampling unit extends into the flue, and the other end of the sampling unit is connected with the microwave measuring unit; the microwave measuring unit comprises a microwave measuring tube, an ash position sensor, a microwave resonant cavity and a microwave frequency sweep measuring instrument, wherein the upper end surface and the lower end surface of the microwave resonant cavity are respectively provided with a central circular hole, the microwave measuring tube penetrates through the upper central circular hole and the lower central circular hole of the microwave resonant cavity to be arranged, the top end of the microwave measuring tube is connected with the sampling unit, the bottom end of the microwave measuring tube is connected with the feeding unit, the ash position sensor is arranged right above the microwave resonant cavity, a detection light ray of the ash position sensor penetrates through the axial center of the microwave measuring tube, and the microwave frequency sweep measuring instrument is; the feeding unit comprises a motor feeder and an ash sample discharging pipe, the motor feeder comprises a motor, a crankshaft, a connecting rod, a push rod, a feeding hole and a discharging hole, the crankshaft is fixed on a rotating shaft of the motor, one end of the connecting rod is connected with the crankshaft, the other end of the connecting rod is connected with a fixed end of the push rod, a movable end of the push rod moves back and forth between the feeding hole and the discharging hole, the feeding hole is vertically arranged and is connected with the bottom end of a microwave measuring pipe, the discharging hole is horizontally arranged and is communicated with the feeding hole, the other end of the discharging hole is connected with the ash sample discharging pipe; the ash sample transmission unit comprises a discharging ash storage pipe, a middle ash storage chamber and a sample adding pipe, wherein the top end of the discharging ash storage pipe is connected with an ash sample discharging pipe, the bottom end of the discharging ash storage pipe is connected with the top end of the middle ash storage chamber through an ash storage valve, the bottom end of the middle ash storage chamber is connected with the top end of the sample adding pipe through a sample adding valve, the bottom end of the sample adding pipe is connected into the burning fly ash measuring instrument, and the ash storage valve, the sample adding valve and the burning fly ash measuring instrument are controlled by the program controller; the powder return unit comprises an ash discharge electromagnetic valve, a jet air ejector, a jet electromagnetic valve and a powder return opening, one end of the ash discharge electromagnetic valve is connected to the upper half section of the middle ash storage chamber, the other end of the ash discharge electromagnetic valve is connected to a compressed air source pipeline, one end of an ash discharge pipe is connected to the lower half section of the middle ash storage chamber, the other end of the ash discharge pipe is connected to the powder return opening through the jet air ejector, the powder return opening is communicated with a flue, an ash discharge valve is arranged on the ash discharge pipe, one end of the jet electromagnetic valve is connected to the jet air ejector, and the.
Furthermore, the fly ash carbon content quick measuring device with the automatic calibration function adopts a sampling unit which adopts a self-drawing type sampler without external power and comprises a Laval ejector, a sampling pipe, a gas-leading pipe and a cyclone separator, wherein the Laval ejector is clamped on one wall in a flue, a jet orifice of the Laval ejector is an oblique-cut opening, the opening faces to the direction opposite to the flow direction of flue gas, and the center of a nozzle of the Laval ejector is connected with the top of the cyclone separator through the gas-leading pipe; the sampling tube is clamped on one wall in the flue and is positioned below the Laval ejector, a sampling nozzle is arranged at the tail end of the sampling tube, the sampling nozzle faces the flow direction of the flue gas, and one end of the sampling tube, which is positioned outside the flue, is connected with an air inlet on the side surface of the cyclone separator; the cyclone separator is vertically installed, and the bottom outlet of the cyclone separator is connected with the top end of the microwave measuring tube of the microwave measuring unit.
Furthermore, the fly ash carbon content rapid measurement device with the automatic calibration function is characterized in that the microwave measurement tube is a non-metal round tube with a cavity structure and is made of transparent materials such as Teflon, tetrafluoroethylene or quartz glass tubes and the like.
Furthermore, the fly ash carbon content rapid measuring device with the automatic calibration function adopts a correlation laser sensor, an optical fiber sensor or an infrared photoelectric sensor as the ash level sensor.
Furthermore, the fly ash carbon content rapid measuring device with the automatic calibration function of the invention has the microwave resonance frequency of 1.5-9.5 GHz.
Furthermore, the fly ash carbon content rapid measurement device with the automatic calibration function of the invention is characterized in that the microwave resonant cavity is a microwave resonant measurement sensor made of metal materials and adopts a cylindrical resonant cavity, a rectangular waveguide resonant cavity or other forms of microwave resonant cavities.
Furthermore, the fly ash carbon content rapid measuring device with the automatic calibration function adopts a cylindrical resonant cavity as the microwave resonant cavity, and the resonant frequency is 2.5-3.0 GHz.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the rapid measuring device for the carbon content of the fly ash with the automatic calibration function has the advantages of simple structure, convenience in use, high and accurate measurement precision, and can return the residual fly ash to the flue so as to avoid polluting the field environment.
2. The fly ash carbon content quick measuring device with the automatic calibration function can be suitable for measuring the fly ash carbon content by non-flue sampling.
Drawings
FIG. 1 is a schematic view of the overall structure of the fly ash carbon content rapid measuring device with automatic calibration function of the present invention.
FIG. 2 is a schematic structural diagram of a motor feeder of the fly ash carbon content rapid measuring device with an automatic calibration function of the present invention.
Reference signs mean: 1: flue, 2: laval injector, 3: sampling tube, 4: air entraining machine, 5: cyclone separator, 6: microwave measurement tube, 7: level sensor, 8: microwave cavity, 9: microwave frequency sweep measuring instrument, 10: motor feeder, 11: ash sample discharge pipe, 12: discharge ash storage tube, 13: ash storage valve, 14: ash discharge solenoid valve, 15: intermediate ash storage chamber, 16: sample adding valve 17: sample addition tube, 18: ash discharge valve, 19: jet ejector, 20: jet solenoid valve, 21: powder return port, 22: firing fly ash measuring instrument.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A fly ash carbon content rapid measuring device with an automatic calibration function comprises a sampling unit, a microwave measuring unit, a feeding unit, an ash sample transmission unit, a powder returning unit, a burning fly ash measuring instrument 22 and a program controller. Wherein:
the sampling unit adopts a self-drawing sampler without external power or other power drawing samplers, one end of the sampling unit extends into the flue 1, and the other end of the sampling unit is connected with the microwave measuring unit.
The microwave measuring unit comprises a microwave measuring tube 6, an ash level sensor 7, a microwave resonant cavity 8 and a microwave frequency sweep measuring instrument 9, a central round hole is formed in the upper end face and the lower end face of the microwave resonant cavity 8, the microwave measuring tube 6 penetrates through the upper central round hole and the lower central round hole of the microwave resonant cavity 8, the top end of the microwave measuring tube is connected with the sampling unit, the bottom end of the microwave measuring tube is connected with the feeding unit, the ash level sensor 7 is installed right above the microwave resonant cavity 8, detection light rays of the ash level sensor pass through the axis center of the microwave measuring tube 6, and the microwave frequency sweep measuring instrument 9 is connected with a coupling probe arranged on. The microwave measuring tube 6 is a non-metal round tube with a cavity structure and is made of transparent materials such as Teflon, tetrafluoroethylene or quartz glass tubes and the like. The ash level sensor 7 adopts a correlation laser sensor, an optical fiber sensor or an infrared photoelectric sensor. The microwave resonant cavity 8 is a microwave resonant measurement sensor made of a metal material, and adopts a cylindrical resonant cavity, a rectangular waveguide resonant cavity or other forms of microwave resonant cavities.
The feeding unit comprises a motor feeder 10 and an ash sample discharging pipe 11, the motor feeder 10 comprises a motor 10-1, a crankshaft 10-2 and a connecting rod 10-3, the device comprises a push rod 10-4, a feed inlet 10-5 and a discharge outlet 10-6, wherein the crank shaft 10-2 is fixed on a rotating shaft of a motor 10-1, one end of a connecting rod 10-3 is connected with the crank shaft 10-2, the other end of the connecting rod is connected with a fixed end of the push rod 10-4, a movable end of the push rod 10-4 moves back and forth between the feed inlet 10-5 and the discharge outlet 10-6, the feed inlet 10-5 is vertically arranged and is connected with the bottom end of a microwave measuring tube 6, the discharge outlet 10-6 is horizontally arranged and is communicated with the feed inlet 10-5, the other end of the discharge outlet 10-6 is connected with an ash sample discharge pipe 11, and the other end of.
The ash sample transmission unit comprises an ash discharging and storing pipe 12, a middle ash storing chamber 15 and a sample adding pipe 17, the top end of the ash discharging and storing pipe 12 is connected with an ash sample discharging pipe 11, the bottom end of the ash discharging and storing pipe 12 is connected with the top end of the middle ash storing chamber 15 through an ash storing valve 13, the bottom end of the middle ash storing chamber 15 is connected with the top end of the sample adding pipe 17 through a sample adding valve 16, the bottom end of the sample adding pipe 17 is connected into a burning fly ash measuring instrument 22, and the ash storing valve 13, the sample adding valve 16 and the burning fly ash measuring instrument 22 are all controlled by a program controller.
The powder return unit comprises an ash discharge electromagnetic valve 14, a jet ejector 19, a jet electromagnetic valve 20 and a powder return port 21, one end of the ash discharge electromagnetic valve 14 is connected to the upper half section of the middle ash storage chamber 15, the other end of the ash discharge electromagnetic valve is connected to a compressed air source pipeline, one end of an ash discharge pipe is connected to the lower half section of the middle ash storage chamber 15, the other end of the ash discharge pipe is connected to the powder return port 21 through the jet ejector 19, the powder return port 21 is communicated with the flue 1, an ash discharge valve 18 is arranged on the ash discharge pipe, one end of the jet electromagnetic valve 20 is connected to the jet ejector 19, and the other end of.
Example 1
A fly ash carbon content rapid measurement device with an automatic calibration function is shown in figure 1 and comprises a sampling unit, a microwave measurement unit, a feeding unit, an ash sample transmission unit, a powder return unit, a burning fly ash measurement instrument 22 and a program controller. Wherein:
1) one end of the sampling unit extends into the flue 1, and the other end is connected with the microwave measuring unit. The sampling unit adopts a self-drawing type sampler without external power and comprises a Laval ejector 2, a sampling pipe 3, a gas-guiding pipe 4 and a cyclone separator 5. The Laval ejector 2 is clamped on one wall in the flue 1, a jet orifice of the Laval ejector 2 is an inclined cut opening, the opening faces to the direction opposite to the flow direction of flue gas, and the center of a nozzle of the Laval ejector 2 is connected with the top of the cyclone separator 5 through a gas guide pipe 4. The sampling tube 3 is clamped on one wall in the flue 1 and is positioned below the Laval ejector 2, the tail end of the sampling tube 3 is provided with a sampling nozzle, the direction of the sampling nozzle faces the flow direction of the flue gas, and one end of the sampling tube 3, which is positioned outside the flue 1, is connected with an air inlet on the side surface of the cyclone separator 5. The cyclone separator 5 is vertically installed and its bottom outlet is connected to the top end of the microwave measuring tube 6 of the microwave measuring unit.
The fly ash sampling in the flue is completed by the self-drawing sampler without external power, and the realization process is as follows: the Laval ejector 2 generates negative pressure to enable the flue gas with the fly ash to enter the cyclone separator 5 from the sampling pipe 3, due to the inertia effect, ash-like particles are settled to the outlet at the lower end of the cyclone separator 5 under the action of gravity after rotating at high speed in the cyclone separator 5, the gas enters the Laval ejector 2 through the pipeline of the gas-entraining device 4 under the action of the negative pressure and returns to the flue 1, and the sampling unit completes the automatic sampling process of the fly ash particles of the flue gas in the flue 1.
In addition, the scheme is also suitable for a carbon content measuring system for non-flue sampling measurement, and the carbon content can be measured by adopting the method and the device no matter what sampler for collecting the ash sample is adopted.
2) The microwave measuring unit comprises a microwave measuring tube 6, an ash level sensor 7, a microwave resonant cavity 8 and a microwave frequency sweep measuring instrument 9. The microwave resonant cavity 8 adopts a cylindrical resonant cavity, and the resonant frequency is 2.5-3.0 GHz. The upper and lower end faces of the microwave resonant cavity 8 are provided with a central round hole, the microwave measuring tube 6 passes through the upper and lower central round holes of the microwave resonant cavity 8, the top end of the microwave measuring tube is connected with the sampling unit, and the bottom end of the microwave measuring tube is connected with the feeding unit. The ash level sensor 7 is arranged right above the microwave resonant cavity 8, the detection light rays of the ash level sensor pass through the axis center of the microwave measuring tube 6, and the ash level sensor 7 adopts a correlation type laser sensor. The microwave sweep frequency measuring instrument 9 is connected with a coupling probe arranged on the lower end face of the microwave resonant cavity 8 through a coaxial cable. The microwave measuring tube 6 is a non-metal round tube with a cavity structure and is made of Teflon material.
When the fly ash material level is piled up in the microwave measuring tube 6 from bottom to top and exceeds the detection light of the ash level sensor 7, the light emitted by the ash level sensor 7 is completely shielded by the fly ash material, so that the ash level sensor 7 is triggered to emit an action signal, and the system can judge the ash level condition in the microwave measuring tube 6 according to the signal.
The microwave sweep frequency measuring instrument 9 can obtain the carbon content of the fly ash according to the measurement and analysis of the microwave resonant cavity characteristics and the calibration curve between the microwave resonance characteristic data and the carbon content of the fly ash. The microwave measurement is fast, and the measurement can be completed within about 2 seconds generally.
3) The feeding unit comprises a motor feeder 10 and an ash sample discharging pipe 11, the motor feeder 10 comprises a motor 10-1, a crankshaft 10-2 and a connecting rod 10-3, the device comprises a push rod 10-4, a feed inlet 10-5 and a discharge outlet 10-6, wherein the crank shaft 10-2 is fixed on a rotating shaft of a motor 10-1, one end of a connecting rod 10-3 is connected with the crank shaft 10-2, the other end of the connecting rod is connected with a fixed end of the push rod 10-4, a movable end of the push rod 10-4 moves back and forth between the feed inlet 10-5 and the discharge outlet 10-6, the feed inlet 10-5 is vertically arranged and is connected with the bottom end of a microwave measuring tube 6, the discharge outlet 10-6 is horizontally arranged and is communicated with the feed inlet 10-5, the other end of the discharge outlet 10-6 is connected with an ash sample discharge pipe 11, and the other end of.
The specific implementation is as follows: the 10-2 crankshaft is driven by the rotating shaft of the 10-1 motor to operate, the 10-2 crankshaft drives the 10-3 connecting rod to reciprocate, so that the top end of the 10-4 push rod moves back and forth between the 10-5 feed inlet and the 10-6 discharge outlet, and the fly ash material in the microwave measuring tube 6 is pushed to the 10-6 discharge outlet from the 10-5 feed inlet continuously, and the transfer of the fly ash material from the microwave measuring tube 6 to the ash sample discharge tube 11 is completed.
4) The ash sample transmission unit comprises an ash discharging and storing pipe 12, a middle ash storing chamber 15 and a sample adding pipe 17, the top end of the ash discharging and storing pipe 12 is connected with an ash sample discharging pipe 11, the bottom end of the ash discharging and storing pipe 12 is connected with the top end of the middle ash storing chamber 15 through an ash storing valve 13, the bottom end of the middle ash storing chamber 15 is connected with the top end of the sample adding pipe 17 through a sample adding valve 16, the bottom end of the sample adding pipe 17 is connected into a burning fly ash measuring instrument 22, and the ash storing valve 13, the sample adding valve 16 and the burning fly ash measuring instrument 22 are all controlled by a program controller.
The specific implementation is as follows: through the operation of the motor feeder 10, the fly ash material continuously enters the discharging ash storage pipe 12, the ash storage valve 13 is controlled by a program and is opened intermittently, so that the ash sample in the discharging ash storage pipe 12 falls into the intermediate storage chamber 15, the sample adding valve 16 is controlled by the program, and when the sample adding valve is opened, the ash sample in the intermediate storage chamber 15 is transmitted to the burning fly ash measuring instrument 22 through the sample adding pipe 17.
The burning fly ash measuring instrument 22 in the embodiment adopts the invention patents of the company: a burning carbon measuring device ZL200910232825.5 for boiler fly ash realizes burning measurement of an ash sample. The burning method fly ash measuring device measures the period of an ash sample for about 20-30 minutes and then sends a carbon content value to the program controller. The burning method measurement principle and the flow are basically carried out according to the electric power industry standard for measuring the carbon content of the fly ash, and the measurement precision is not changed by the change of the physical characteristics of coal and particles, such as density, granularity, ash content and the like, so the measurement precision is high and stable.
5) The powder return unit comprises an ash discharge electromagnetic valve 14, a jet ejector 19, a jet electromagnetic valve 20 and a powder return port 21, one end of the ash discharge electromagnetic valve 14 is connected to the upper half section of the middle ash storage chamber 15, the other end of the ash discharge electromagnetic valve is connected to a compressed air source pipeline, one end of an ash discharge pipe is connected to the lower half section of the middle ash storage chamber 15, the other end of the ash discharge pipe is connected to the powder return port 21 through the jet ejector 19, the powder return port 21 is communicated with the flue 1, an ash discharge valve 18 is arranged on the ash discharge pipe, one end of the jet electromagnetic valve 20 is connected to the jet ejector 19, and the other end of.
Both the ash discharge solenoid valve 14 and the jet solenoid valve 20 are off when not operating. Part of the fly ash after microwave measurement needs to be sent to the burning fly ash measuring instrument 22 for use, most fly ash samples after microwave measurement need to return to a flue so as to avoid polluting the field environment, and the purpose of the powder returning unit is to realize the function.
When returning powder, the program control closes the ash storage valve 13, closes the sample adding valve 16, opens the ash discharge valve 18, opens the jet electromagnetic valve 20, generates suction effect by the jet air ejector 19, opens the ash discharge electromagnetic valve 14, and allows compressed air to enter the intermediate discharge chamber 15, and all ash samples in the intermediate storage chamber 15 are returned to the flue 1 under the combined action of the jet air ejector 19, so that the ash samples in the intermediate storage chamber 15 are emptied.
The measuring method of the fly ash carbon content quick measuring device with the automatic calibration function comprises the following steps:
the first step is as follows: the system is powered on, the program controls to close the ash storage valve 13 and the sample adding valve 16, open the ash discharge valve 18 and the jet flow electromagnetic valve 20, the jet flow air ejector 19 generates a suction effect, open the ash discharge electromagnetic valve 14, compressed air enters the intermediate discharge chamber 15, and under the combined action of the jet flow air ejector 19, all ash samples in the intermediate ash storage chamber 15 are returned to the flue 1, so that ash samples in the intermediate storage chamber 15 are emptied.
The second step is that: closing the jet flow electromagnetic valve 20, opening the ash storage valve 13, emptying the ash sample in the ash sample discharge pipe 11, the motor feeder 10 and the microwave measuring pipe 6, then closing the ash discharge electromagnetic valve 14, and closing the ash storage valve 13.
The third step: waiting for the collection of the ash sample until the ash sample in the microwave measuring tube 6 is accumulated to the detection line position of the ash level sensor 7, so that the output of the ash level sensor 7 is in a shielding state.
The fourth step: when the output of the ash level sensor 7 is in a shielding state, the microwave frequency sweep measuring instrument 9 detects a primary resonant cavity characteristic curve, calculates a microwave measured value of the carbon content of the fly ash according to a predetermined calibration curve, and continuously records corresponding microwave characteristic curve parameters and carbon content values.
The fifth step: after the microwave measurement is finished, the motor feeder 10 starts to be powered on to work, and stops after being controlled by a program to work for one stroke, so that the ash sample in the feeding hole 10-5 is pushed out to the discharging hole 10-6. In one working stroke of the motor feeder 10, the push rod 10-3 pushes the ash sample falling into the feed inlet 10-5 to the discharge outlet 10-6, the ash sample in the original discharge outlet 10-6 is pushed into the ash sample discharge pipe 11, and the fly ash in the discharge pipe 11 is pushed into the discharge storage pipe 12. The ash sample in the microwave measuring tube 6 automatically moves downward due to gravity, thereby filling the feed opening 10-5.
If the ash level sensor 7 detects that the ash sample in the microwave measuring pipe 6 is not in place, the motor feeder 10 does not act until the ash level sensor 7 detects that the ash sample in the microwave measuring pipe 6 is full, the motor feeder 10 is electrically operated for one stroke, and the steps are repeated.
The program controller automatically records the number of times the motor feeder 10 is operated.
And a sixth step: the program sets the working times of the motor feeder 10 in advance, when the working times of the motor feeder 10 reach the preset times, the ash storage valve 13 is opened to enable the ash sample in the discharging ash storage pipe 12 to fall into the middle ash storage chamber 15, and then the ash storage valve 13 is closed.
The seventh step: when the burning fly ash measuring instrument 22 completes one burning measurement or is first ready to receive ash sample measurement, it will automatically send a sample loading request signal. When the program controller receives the sample application request signal, the sample application valve 16 is opened to apply the ash sample in the intermediate ash storage chamber 15 to the sample application mechanism of the burning fly ash measuring instrument 22, and then the sample application valve 16 is closed. And simultaneously, the program controller sends an instruction to control the burning fly ash measuring instrument 22 to carry out burning method measurement on the ash sample.
Eighth step: in the flying ash burning measurement process, ash samples are continuously collected by the flying ash sampling unit and fall into the microwave measuring tube 6, and under the work of the motor feeder 10, the ash samples are continuously pushed into the discharging ash storage tube 12 until the preset working times of the motor feeder 10 are reached, the ash storage valve 13 is opened, and the ash samples are added into the middle ash storage chamber 15.
The ninth step: before the burning fly ash measuring instrument 22 finishes measuring, once an ash sample is added into the intermediate ash storage chamber 15, the ash sample needs to be discharged back to the flue in time. The working process is as follows: opening an ash discharge valve 18, and opening a jet electromagnetic valve 20 to enable a jet air ejector 19 to work to generate suction force; then the ash discharge electromagnetic valve 14 is opened, the compressed air source enters the intermediate ash storage chamber 15, and the ash sample in the intermediate ash storage chamber is discharged into the ash flue under the combined action of the compressed air source and the jet ejector 19.
The tenth step: and (3) data correction: if the burning fly ash measuring instrument 22 finishes the measurement, accurate carbon content data (called ash sample true value for short) can be obtained, and the program controller corrects the carbon content measurement data according to the average value (called microwave mean value for short) of the carbon content data measured by a plurality of microwaves before and after the ash sample is added into the burning fly ash measuring instrument 22 at that time.
Recording the value of 'grey sample true value'/'microwave mean value' as K, and then correcting the subsequent microwave measured value by using the K value, wherein the correction method comprises the following steps: the carbon content measured for the microwave is multiplied by the k value. Therefore, the high-precision carbon content value obtained by measuring the carbon content of the fly ash by the burning method continuously corrects the microwave method data for quick measurement, thereby realizing the quick and accurate measurement of the carbon content of the fly ash.
The foregoing is directed to embodiments of the present invention and, more particularly, to a method and apparatus for controlling a power converter in a power converter, including a power converter, a power.
Claims (7)
1. The utility model provides a flying dust carbon content rapid survey device with automatic calibration function which characterized in that, includes sampling unit, microwave measuring unit, feed unit, ash sample transmission unit, returns whitewashed unit, firing flying dust measuring apparatu (22) and program controller, wherein:
the sampling unit adopts a self-drawing sampler without external power or other power drawing samplers, one end of the sampling unit extends into the flue (1), and the other end of the sampling unit is connected with the microwave measuring unit;
the microwave measuring unit comprises a microwave measuring tube (6), an ash level sensor (7), a microwave resonant cavity (8) and a microwave frequency sweep measuring instrument (9), wherein the upper end surface and the lower end surface of the microwave resonant cavity (8) are respectively provided with a central round hole, the microwave measuring tube (6) penetrates through the upper central round hole and the lower central round hole of the microwave resonant cavity (8), the top end of the microwave measuring tube is connected with the sampling unit, the bottom end of the microwave measuring tube is connected with the feeding unit, the ash level sensor (7) is arranged right above the microwave resonant cavity (8), a detection light ray of the ash level sensor penetrates through the axis center of the microwave measuring tube (6), and the microwave frequency sweep measuring instrument (9) is connected with a coupling probe arranged on the lower;
the feeding unit comprises a motor feeder (10) and an ash sample discharging pipe (11), the motor feeder (10) comprises a motor (10-1), a crankshaft (10-2), a connecting rod (10-3), a push rod (10-4), a feeding hole (10-5) and a discharging hole (10-6), the crankshaft (10-2) is fixed on a rotating shaft of the motor (10-1), one end of the connecting rod (10-3) is connected with the crankshaft (10-2), the other end of the connecting rod is connected with a fixed end of the push rod (10-4), a movable end of the push rod (10-4) moves back and forth between the feeding hole (10-5) and the discharging hole (10-6), the feeding hole (10-5) is vertically arranged and is connected with the bottom end of the microwave measuring pipe (6), the discharging hole (10-6) is horizontally arranged and is communicated with the feeding hole (10-5), the other end of the discharge hole (10-6) is connected with an ash sample discharge pipe (11), and the other end of the ash sample discharge pipe (11) is connected with an ash sample transmission unit;
the ash sample transmission unit comprises a discharge ash storage pipe (12), a middle ash storage chamber (15) and a sample adding pipe (17), the top end of the discharge ash storage pipe (12) is connected with an ash sample discharge pipe (11), the bottom end of the discharge ash storage pipe (12) is connected with the top end of the middle ash storage chamber (15) through an ash storage valve (13), the bottom end of the middle ash storage chamber (15) is connected with the top end of the sample adding pipe (17) through a sample adding valve (16), the bottom end of the sample adding pipe (17) is connected into a burning fly ash measuring instrument (22), and the ash storage valve (13), the sample adding valve (16) and the burning fly ash measuring instrument (22) are controlled by a program controller;
the powder return unit comprises an ash discharge electromagnetic valve (14), a jet air ejector (19), a jet electromagnetic valve (20) and a powder return opening (21), one end of the ash discharge electromagnetic valve (14) is connected to the upper half section of the middle ash storage chamber (15), the other end of the ash discharge electromagnetic valve is connected with a compressed air source pipeline, one end of an ash discharge pipe is connected to the lower half section of the middle ash storage chamber (15), the other end of the ash discharge pipe is connected with the powder return opening (21) through the jet air ejector (19), the powder return opening (21) is communicated with the flue (1), an ash discharge valve (18) is arranged on the ash discharge pipe, one end of the jet electromagnetic valve (20) is connected to the jet air ejector (19), and the other end of the.
2. The fly ash carbon content rapid measuring device with the automatic calibration function according to claim 1, characterized in that the sampling unit adopts a self-drawing type sampler without external power, and comprises a Laval ejector (2), a sampling tube (3), a gas-introducing tube (4) and a cyclone separator (5), wherein the Laval ejector (2) is clamped on one wall in the flue (1), the jet orifice of the Laval ejector (2) is an oblique-cut opening and faces to the direction opposite to the flow direction of flue gas, and the nozzle center of the Laval ejector (2) is connected with the top of the cyclone separator (5) through the gas-introducing tube (4); the sampling tube (3) is clamped on one wall in the flue (1) and is positioned below the Laval ejector (2), a sampling nozzle is arranged at the tail end of the sampling tube (3), the sampling nozzle faces the flow direction of flue gas, and one end of the sampling tube (3) positioned outside the flue (1) is connected with an air inlet on the side surface of the cyclone separator (5); the cyclone separator (5) is vertically arranged, and the outlet at the bottom of the cyclone separator is connected with the top end of a microwave measuring tube (6) of the microwave measuring unit.
3. The fly ash carbon content rapid measurement device with the automatic calibration function according to claim 1, wherein the microwave measurement tube (6) is a non-metal round tube with a cavity structure, and is made of Teflon, tetrafluoroethylene or quartz glass tube.
4. The fly ash carbon content rapid measuring device with the automatic calibration function according to claim 1, characterized in that the ash level sensor (7) adopts a correlation laser sensor, an optical fiber sensor or an infrared photoelectric sensor.
5. The fly ash carbon content rapid measuring device with the automatic calibration function according to claim 1, wherein the microwave resonant frequency used by the microwave resonant cavity (8) is 1.5-9.5 GHz.
6. The fly ash carbon content rapid measuring device with the automatic calibration function according to claim 1 or 5, characterized in that the microwave resonant cavity (8) is a microwave resonant measuring sensor made of metal material, and adopts a cylindrical resonant cavity, a rectangular waveguide resonant cavity or other forms of microwave resonant cavities.
7. The fly ash carbon content rapid measuring device with the automatic calibration function according to claim 1 or 5, characterized in that the microwave resonant cavity (8) is a cylindrical resonant cavity, and the resonant frequency is 2.5-3.0 GHz.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113984956A (en) * | 2021-09-22 | 2022-01-28 | 华北电力大学 | Fly ash carbon content measuring system and method for realizing controllable ash taking and carbon measuring |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113984956A (en) * | 2021-09-22 | 2022-01-28 | 华北电力大学 | Fly ash carbon content measuring system and method for realizing controllable ash taking and carbon measuring |
| CN113984956B (en) * | 2021-09-22 | 2023-10-24 | 华北电力大学 | Fly ash carbon content measuring system and method for realizing controllable ash taking and carbon measurement |
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