CN110186826B - Powder preparation system, device and method for detecting concentration and particle size of pulverized coal - Google Patents
Powder preparation system, device and method for detecting concentration and particle size of pulverized coal Download PDFInfo
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- CN110186826B CN110186826B CN201910620028.8A CN201910620028A CN110186826B CN 110186826 B CN110186826 B CN 110186826B CN 201910620028 A CN201910620028 A CN 201910620028A CN 110186826 B CN110186826 B CN 110186826B
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- 239000003245 coal Substances 0.000 title claims abstract description 129
- 239000000843 powder Substances 0.000 title claims abstract description 122
- 239000002245 particle Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title description 2
- 238000001514 detection method Methods 0.000 claims abstract description 277
- 238000007789 sealing Methods 0.000 claims abstract description 107
- 239000002817 coal dust Substances 0.000 claims abstract description 23
- 238000010298 pulverizing process Methods 0.000 claims abstract description 12
- 239000000428 dust Substances 0.000 claims abstract description 9
- 239000000523 sample Substances 0.000 claims description 99
- 230000003287 optical effect Effects 0.000 claims description 14
- 239000013307 optical fiber Substances 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 21
- 238000010586 diagram Methods 0.000 description 8
- 230000010349 pulsation Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a device for detecting the concentration and the particle size of pulverized coal, which comprises a detection part, a control part and a control part, wherein the detection part is used for extending into a primary air-powder pipe and detecting the concentration and the particle size of the pulverized coal in the primary air-powder pipe; the power part is connected with the detection part and used for driving the detection part to extend into and leave from the primary air-powder pipe; and the sealing part is used for being connected with the primary air powder pipe, realizing sealing between the detection part and the primary air powder pipe when in detection, and avoiding the leakage of the pulverized coal in the primary air powder pipe to the outside when no detection is needed. The device can rapidly detect the concentration and the particle size of coal dust at all measuring points in the primary air-dust pipe, and solves the problems that the detection efficiency is low and the on-line detection cannot be realized. In addition, the invention also discloses a pulverizing system comprising the device and a method for detecting the concentration and the particle size of the pulverized coal.
Description
Technical Field
The invention relates to the technical field of pulverized coal monitoring, in particular to a device for detecting concentration and particle size of pulverized coal. In addition, the invention also relates to a pulverizing system comprising the device and a method for detecting the concentration and the particle size of pulverized coal.
Background
The coal powder required to be combusted in the coal-fired boiler is generally ground by a coal mill in a coal pulverizing system, the coal pulverizing system is mainly divided into a direct-fired coal pulverizing system and an intermediate warehouse-type coal pulverizing system, and a plurality of primary air-powder pipes are required to be arranged for each system to guide the coal powder in the coal mill into a combustor in the coal-fired boiler for combustion.
In order to accurately obtain the average concentration of the pulverized coal in the primary air-powder tube, a plurality of measuring points are required to be arranged in the primary air-powder tube, at present, the pulverized coal at each measuring point is generally sampled, the concentration of the pulverized coal is calculated according to the sampled pulverized coal amount, and the particle size of the pulverized coal can be obtained according to the sampled sample.
Therefore, how to rapidly detect the concentration and the particle size of the pulverized coal in the primary air duct is a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a device for detecting the concentration and the particle size of pulverized coal, which can rapidly detect the concentration and the particle size of pulverized coal at all measuring points in a primary air-powder pipe, and solves the problems of low detection efficiency and incapability of realizing on-line detection. It is another object of the present invention to provide a pulverizing system including the above apparatus and a method of detecting the concentration and particle size of pulverized coal.
In order to achieve the above object, the present invention provides an apparatus for detecting concentration and particle size of pulverized coal, comprising: the detection part is used for extending into the primary air powder pipe and detecting the concentration and the particle size of the pulverized coal in the primary air powder pipe; the power part is connected with the detection part and used for driving the detection part to extend into and leave from the primary air-powder pipe; and the sealing part is used for being connected with the primary air powder pipe, realizing sealing between the detection part and the primary air powder pipe when in detection, and avoiding the leakage of the pulverized coal in the primary air powder pipe to the outside when no detection is needed.
Preferably, the detection section includes: a tubular detection probe; the first end of the detection probe is used for penetrating through the sealing part and extending into the primary air-powder pipe, a detection through hole for flowing pulverized coal is formed in the first end of the detection probe, and the second end of the detection probe is connected with the power part; a laser emission sub-part connected with the detection probe and used for emitting laser to the detection through hole; and the transmitted light processing sub-part is connected with the detection probe and is used for receiving the laser passing through the detection through hole and calculating the concentration and the particle size of the pulverized coal.
Preferably, the laser emitting sub-section includes: a laser emitter for emitting laser light; the optical fiber is arranged in the detection probe and used for conducting laser emitted by the laser emitter to the first end of the detection probe; the laser collimator is arranged at the first end of the detection probe and connected with the optical fiber, and is used for receiving laser and correcting the laser into a beam of parallel light to irradiate the detection through hole; the transmitted light processing sub-section includes: the photoelectric converter is arranged at the first end of the detection probe and is used for receiving the laser transmitted through the detection through hole and converting the laser into an electric signal; the signal processor is electrically connected with the photoelectric converter and used for acquiring an electric signal sent by the photoelectric converter and calculating to obtain the concentration and the particle size of the pulverized coal; the photoelectric converter and the laser collimator are arranged on two sides of the detection through hole respectively, and the laser collimator is far away from the first end of the detection probe relative to the photoelectric converter.
Preferably, the detecting section further includes: the first optical lens is arranged on one side of the detection through hole, close to the laser collimator, and is used for preventing the laser collimator from contacting with pulverized coal; and the second optical lens is arranged on one side of the detection through hole, which is close to the photoelectric converter, and is used for preventing the photoelectric converter from contacting with pulverized coal.
Preferably, the sealing part includes: the tube seat is communicated with the primary air-powder tube and used for the detection probe to pass through and extend into the primary air-powder tube; the valve body is arranged in the tube seat, is opened when detection is needed, and is used for enabling the detection probe to sequentially extend into the tube seat and the primary air-powder tube, and is closed when detection is not needed so as to avoid coal dust leakage; and the sealer is connected with the tube seat and used for preventing pulverized coal from leaking when the valve body is opened.
Preferably, the sealer comprises: a sealing cushion for allowing only the detection probe to pass through; the sealing support is connected with the tube seat and used for supporting the sealing cushion; the sealing cover is connected with the sealing support and used for fixing the sealing cushion; the sealing support and the sealing cover are respectively arranged at two sides of the sealing cushion so as to clamp the edge of the sealing cushion.
Preferably, the power section includes: a movable frame connected to the second end of the detection probe; a guide member connected to the moving frame for restricting a moving direction of the moving frame; the supporting seat is connected with the guide piece and used for supporting the guide piece; and the power source is used for realizing the movement of the movable frame along the guide piece.
Preferably, the guide is in particular a screw; the power source is specifically a motor, and the motor is connected with the screw rod to drive the screw rod to rotate; the movable frame is provided with a nut seat matched with the screw rod.
Compared with the background art, the device for detecting the concentration and the particle size of the pulverized coal provided by the invention has the advantages that the power part drives the detection part to sequentially reach each measuring point in the primary air-powder pipe to obtain the concentration and the particle size of the pulverized coal. Specifically, when detection is needed, the sealing part is opened, the power part drives the detection part to sequentially extend into the sealing part and the primary air powder pipe, the detection part is driven to reach a measuring point in the primary air powder pipe, the detection part is driven to reach the next measuring point for detection after the detection of the measuring point is finished, the detection is carried out until the detection of all the measuring points is finished by the detection part, and in the detection process, the sealing part always keeps the sealing between the primary air powder pipe and the detection part, so that coal powder is prevented from leaking to the outside in the detection process; when the detection is not needed, the power part drives the detection part to sequentially leave the primary air powder pipe and the sealing part, so that the detection part is prevented from being detained in the primary air powder pipe to influence the flow of coal powder, and the sealing part is closed again, so that the coal powder in the primary air powder pipe is prevented from leaking.
The invention also provides a pulverizing system, comprising: a coal mill for grinding coal briquettes into coal dust; the primary air-powder pipe is connected with the coal mill and used for feeding coal powder into the burner; the fan is connected with the coal mill and used for blowing coal dust into the primary air-dust pipe; the device for detecting the concentration and the particle size of the pulverized coal according to any one of the above-mentioned embodiments, which is connected to the primary air-powder pipe.
The invention also provides a method for detecting the concentration and the particle size of the pulverized coal, which comprises the following steps: s1: opening the sealing part; s2: the driving detection part stretches into the primary air powder pipe; s3: driving the detection part to reach a detection point which is not detected in the primary air-powder pipe, and collecting detection data to obtain the particle size and concentration of the pulverized coal at the current detection point; s4: judging whether all measuring points in the primary air and powder pipe are detected, if not, returning to the step S3, and if so, entering the step S5; s5: driving the detection part to leave the primary air-powder pipe and the sealing part in sequence; s6: closing the seal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a device for detecting the concentration and the particle size of pulverized coal;
Fig. 2 is a schematic structural diagram of a first detecting portion according to the present invention;
FIG. 3 is a schematic structural diagram of a second detecting portion according to the present invention;
FIG. 4 is a schematic view of the seal of FIG. 1;
FIG. 5 is a schematic view of the power unit of FIG. 1;
FIG. 6 is a schematic diagram of the distribution of the measuring points in the primary air duct provided by the invention;
FIG. 7 is a flow chart of a method for detecting coal dust concentration and particle size according to the present invention;
Wherein,
01-Primary air powder pipe, 011-measuring point, 1-detecting probe, 11-detecting through hole, 12-laser emitter, 13-optical fiber, 14-laser collimator, 15-photoelectric converter, 16-wire, 17-signal processor, 171-signal collector, 172-host computer, 18-first optical lens, 19-second optical lens, 2-sealing part, 21-tube seat, 22-valve body, 23-sealing device, 231-sealing support, 232-sealing cushion, 233-sealing cover, 3-power part, 31-movable frame, 32-guide piece, 33-supporting seat, 34-power source and 35-PLC controller.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention will be further described in detail below with reference to the drawings and detailed description for the purpose of enabling those skilled in the art to better understand the aspects of the present invention.
Referring to fig. 1 to 7, fig. 1 is a schematic structural diagram of a device for detecting concentration and particle size of pulverized coal according to the present invention; fig. 2 is a schematic structural diagram of a first detecting portion according to the present invention; FIG. 3 is a schematic structural diagram of a second detecting portion according to the present invention; FIG. 4 is a schematic view of the seal of FIG. 1; FIG. 5 is a schematic view of the power unit of FIG. 1; FIG. 6 is a schematic diagram of the distribution of the measuring points in the primary air duct provided by the invention; fig. 7 is a flow chart of a method for detecting the concentration and the particle size of pulverized coal according to the present invention.
The invention provides a device for detecting the concentration and the particle size of pulverized coal, as shown in figure 1, which comprises: the detection part is used for extending into the primary air powder pipe 01 and detecting the concentration and the particle size of the coal powder in the primary air powder pipe 01; a power part 3 for driving the detection part to extend into and leave from the primary air duct 01; and a sealing part 2 for preventing the coal powder in the primary air-powder pipe 01 from leaking to the outside during the detection process and after the detection is finished.
The power part 3 is connected with the detection part to drive the detection part to move, in the detection process, the power part 3 drives the detection part to sequentially extend into the sealing part 2 and the primary air powder pipe 01 and further drives the detection part to reach a measuring point 011 in the primary air powder pipe 01 so as to detect the concentration and the particle size of coal dust at the measuring point 011 on line, and after the measuring point 011 is detected, the detection part is driven to reach the next measuring point 011 until the detection at all the measuring points 011 is completed; when the detection is not needed, the power part 3 drives the detection part to leave the primary air-powder pipe 01 and the sealing part 2 in sequence, so that the detection part is prevented from being detained in the primary air-powder pipe 01 to influence the flow of coal powder.
The sealing part 2 is used for being connected with the primary air powder pipe 01, a channel through which the detection part can pass is formed in the sealing part 2, when detection is needed, the sealing part 2 is opened to enable the channel to be communicated with the primary air powder pipe 01, so that the detection part can enter the primary air powder pipe 01, and in the detection process, the sealing part 2 always keeps sealing between the detection part and the primary air powder pipe 01, so that coal dust leakage is avoided, and further, the detection part can obtain an accurate detection result of coal dust concentration; when the detection is completed and the detecting portion withdraws from the sealing portion 2, the sealing portion 2 is closed to close the above-described passage communicating with the primary air-dust pipe 01, so as to prevent the leakage of the pulverized coal to the outside.
It can be seen that the device realizes the on-line detection of the detection part at a plurality of measuring points 011 in the primary air powder pipe 01 by driving the detection part through the power part 3, so as to solve the problems that in the prior art, a pulverized coal sample needs to be taken out from the primary air powder pipe 01 and the concentration and the particle size of pulverized coal are obtained offline, and the power part 3 can also withdraw the detection part from the primary air powder pipe 01 after the detection is finished, so that the detection part is prevented from being detained in the primary air powder pipe 01 and affecting the flow field in the primary air powder pipe 01, further the action of manual operation is reduced, and the detection efficiency and the detection accuracy are improved. In addition, sealing portion 2 can also guarantee the sealing between primary air powder pipe 01 and the detection portion in the testing process to avoid causing the inaccurate condition of buggy concentration measurement data because of buggy leaks, sealing portion 2 can also guarantee the sealing to primary air powder pipe 01 after the detection is accomplished, in order to avoid buggy to leaking to the external world.
In other words, the core of the device has two: firstly, the power part 3 is used for driving the detection part to reach each measuring point 011 for online detection and driving the detection part to withdraw the primary air-powder pipe 01, and the sealing part 2 is used for ensuring that the pulverized coal in the primary air-powder pipe 01 cannot leak to the outside in the detection process and after the detection is completed.
It should be noted that, in order to avoid different distribution conditions of pulverized coal with different particle sizes in the primary air-powder tube 01, the pulverized coal concentration at each measuring point 011 is detected, and meanwhile, the particle size of the pulverized coal at each measuring point 011 is also detected, so that a detector can know how the grinding effect of the coal mill is.
The following specific examples are given here for the structural configuration of the detection section:
the detection unit mainly includes: a detection probe 1, a laser emitting sub-section and a transmitted light processing sub-section.
In order to avoid that the detection probe 1 has a large influence on the flow field in the primary air-dust pipe 01, as shown in fig. 1 to 5, the detection probe 1 is preferably designed into a circular tube shape, and the first end of the detection probe 1 is used for penetrating through the sealing part 2 and extending into the primary air-dust pipe 01, that is, the first end of the detection probe 1 is used for contacting with the pulverized coal to realize detection on the concentration and the particle size of the pulverized coal; in order to realize the detection of the coal dust parameters, a detection through hole 11 for the coal dust to keep the original flow direction is formed at the first end of the detection probe 1, namely, the concentration and the particle size of the coal dust flowing through a measurement area formed by the detection through hole 11 are detected on line; and the second end of the detection probe 1 is connected with the power part 3 so as to realize that the power part 3 drives the detection probe 1 to extend into and withdraw from the primary air and powder pipe 01.
The laser emitting sub-part is connected with the detection probe 1 and is used for emitting laser with certain wavelength and intensity to the measurement area formed by the detection through hole 11 so that the laser irradiates coal dust flowing through the measurement area directly. The transmitted light processing sub-part connected with the detection probe 1 is used for receiving the transmitted laser passing through the measurement area so as to acquire information such as the intensity of the transmitted laser and calculate the concentration and the particle size of the pulverized coal at the current measurement point 011 according to the information.
The method for simultaneously detecting the concentration and the particle size of the pulverized coal by using the laser emission sub-part and the transmission light treatment sub-part is a light transmittance pulsation method, and the principle of the method is as follows: the incident light can be scattered and absorbed when passing through the granular medium, and the attenuation degree formula of the transmitted light is as follows:
Wherein I 0 is the light intensity of the incident light emitted by the laser emission sub-part, I is the light intensity of the transmitted light received by the transmitted light processing sub-part, A is the sectional area of the measurement area formed by the detection through hole 11, n is the number of pulverized coal particles in the measurement area, D is the particle size of the pulverized coal particles, E is the particle extinction coefficient, lambda is the wavelength of the incident light, pi is the circumferential rate, and m is the refractive index of the pulverized coal.
When the measurement area is very small, the number of particles and the particle size flowing through the detection through holes 11 are randomly changed, the light intensity I of the transmitted light pulsates along with the time, the random pulsation of the transmitted light is related to the number n and the particle size D of the pulverized coal particles in the measurement area at the moment of detection, and then the number n and the particle size D of the pulverized coal particles can be calculated according to the formula of the light passing rate pulsation method, so that the concentration of the pulverized coal can be calculated.
More specifically, in order to realize the detection conditions of the above-described light passing rate pulsation method, as shown in fig. 2 and 3, the laser emitting sub-section includes: a laser emitter 12, an optical fiber 13 and a laser collimator 14. The laser emitter 12 is used for emitting laser with a certain wavelength, the optical fiber 13 is preset in the detection probe 1 and led out from the second end of the detection probe 1 to be connected with the laser emitter 12 so as to conduct incident light emitted by the laser emitter 12 to the first end of the detection probe 1, and the laser collimator 14 is arranged at the first end of the detection probe 1 and connected with the optical fiber 13 so as to rectify the laser emitted by the optical fiber 13 into a beam of parallel light, so that the beam of parallel light irradiates a measurement area. And in order to achieve long distance and stable beam transmission, the optical fiber 13 is preferably a single mode fiber to improve accuracy of detection result, wherein the single mode fiber is an optical fiber capable of transmitting only one mode, and has small intermode dispersion, thus being suitable for telecommunication.
And the transmissive light processing sub-section includes: a photoelectric converter 15 and a signal processor 17. The photoelectric converter 15 disposed at the first end of the detection probe 1 is configured to receive the transmitted light transmitted through the measurement area formed by the detection through hole 11, convert an optical signal containing information such as the intensity of the transmitted light into an electrical signal and send the electrical signal out, and the signal processor 17 is electrically connected with the photoelectric converter 15, so as to receive the electrical signal sent by the photoelectric converter 15, analyze the information such as the intensity of the transmitted light contained in the electrical signal, and further obtain the concentration and the particle size of the pulverized coal according to the information.
Further specifically, as shown in fig. 2 and 3, a wire 16 is preset in the detection probe 1, one end of the wire 16 is connected to the photoelectric converter 15, and the other end of the wire 16 is led out from the second end of the detection probe 1 and connected to the signal processor 17, so as to electrically connect the photoelectric converter 15 to the signal processor 17. The signal processor 17 includes: the signal collector 171 and the upper computer 172, the signal collector 171 is used for receiving the electrical signal sent by the photoelectric converter 15, and resolving the electrical signal into a digital signal, and then transmitting the digital signal to the upper computer 172 through the data line, and the upper computer 172 calculates the concentration and the particle size of the pulverized coal according to the received digital signal and the parameters such as the light intensity and the wavelength of the incident light.
It should be noted that, the above-mentioned manner of obtaining the parameters of the incident light by the host computer 172 may be to record the parameters of the incident light emitted by the laser emitter 12 in advance, or may be connected to the laser emitter 12 through a data line to obtain the parameters of the incident light in real time.
It will be appreciated that as shown in fig. 2 and 3, the photoelectric converter 15 and the laser collimator 14 should be separately disposed at both sides of the detection through hole 11, so that the laser light is emitted from one side of the measurement area and received from the other side, and preferably, the laser collimator 14 is located far from the first end of the detection probe 1 compared to the photoelectric converter 15.
For better technical effects, as shown in fig. 3, the detection portion further includes: a first optical lens 18 provided on the side of the detection through hole 11 close to the laser collimator 14, and a second optical lens 19 provided on the side of the detection through hole 11 close to the photoelectric converter 15. The first optical lens 18 is used for separating the pulverized coal flowing in the measuring area from the laser collimator 14, so as to avoid the pulverized coal from impacting the laser collimator 14 and causing damage such as blockage, pollution and the like to the laser collimator 14; similarly, the second optical lens 19 is used for separating the coal dust flowing in the measuring area from the photoelectric converter 15, so as to avoid the condition that the coal dust impacts the photoelectric converter 15 and causes damage such as blockage, pollution and the like to the photoelectric converter 15. The first optical lens 18 and the second optical lens 19 may be made of quartz with high temperature resistance, wear resistance and good light transmission performance.
It should be noted that, in this specific embodiment, besides the detection of the concentration and the particle size of the pulverized coal by using the light transmittance pulsation method, the detection portion may also be a component capable of detecting the concentration and the particle size of the pulverized coal by using other structures and principles, for example, sequentially measuring the concentration and the particle size of the pulverized coal at all the measuring points 011 in the primary air duct 01, that is, two detection components for measuring the concentration and the particle size of the pulverized coal respectively, where the principle of detecting the concentration of the pulverized coal may refer to an on-line detection method such as an acoustic method, a capacitive method, a thermodynamic method, etc., and the principle of detecting the particle size of the pulverized coal may refer to a sampling method, etc. in the prior art, which is not specifically described herein.
It should be noted that, herein, the term "on-line" refers to that the detection part directly completes the action of acquiring the parameter to be detected in the primary air-dust tube 01, such as the light intensity I of the transmitted light in the above-mentioned content, in the process of detecting when reaching the measuring point 011; while the components for realizing the "on-line" detection of the detection part in the present embodiment include: a laser emitter 12 in the laser emitting sub-section, etc., and a photoelectric converter 15 and a host computer 172 in the transmitted light processing sub-section, etc.
Furthermore, as can be seen from the description of the present embodiment, the detection probe 1 is a medium for detecting the concentration and the particle size of the pulverized coal, that is, the process of driving the detection part by the power part 3 to extend into and withdraw from the primary air duct 01 is actually to drive the detection probe 1 to extend into and withdraw from the primary air duct 01, in other words, the detection part in the present embodiment should be in contact with the pulverized coal to achieve the measurement of the concentration and the particle size of the pulverized coal, so that the detection part in the present embodiment should include the medium for contacting the pulverized coal, which is the detection probe 1, no matter what kind of contact detection method is used to measure the concentration and the particle size of the pulverized coal.
The following embodiments are given here with respect to the structural configuration of the sealing portion 2:
As shown in fig. 4, the sealing portion 2 includes: a stem 21, a valve body 22, and a sealer 23. The tube seat 21 is connected with the primary air-powder tube 01, and the internal channel of the tube seat 21 is communicated with the primary air-powder tube 01 so that the detection probe 1 stretches into the primary air-powder tube 01 along the channel in the tube seat 21, and preferably, the tube seat 21 is welded on the primary air-powder tube 01; both ends of the valve body 22 are connected with the tube seat 21, namely the tube seat 21 is provided with two sections and is arranged at both ends of the valve body 22 in a separated mode, the valve body 22 and the tube seat 21 are preferably connected in a detachable mode through threads, the valve body 22 is used for being opened when detection is needed so that the detection probe 1 can sequentially extend into the tube seat 21 and the primary air powder tube 01, and when detection is not needed, namely after the detection probe 1 is withdrawn from the primary air powder tube 01, the valve body 22 is closed to seal a channel in the tube seat 21, and further, coal dust in the primary air powder tube 01 is prevented from leaking to the outside along the tube seat 21; the sealer 23 is connected with the tube seat 21, and is preferably detachably connected through a screw fit, and the sealer 23 is used for tightly wrapping the outer wall of the detection probe 1 when the valve body 22 is opened and the detection probe 1 is positioned in the sealing part 2, so as to prevent the pulverized coal in the primary air and powder tube 01 from flowing out to the outside from a gap between the primary air and powder tube 01 and the detection probe 1.
The case where the "detection probe 1 is located in the sealing portion 2" includes: the process of inserting the detection probe 1 into the primary air duct 01 and the time when the detection probe 1 has not been completely withdrawn from the sealing part 2.
In order to ensure the sealing performance of the valve body 22 after closing, the valve body 22 is preferably a ball valve, wherein the ball valve has the characteristics of wear resistance, good sealing performance, light switch and long service life, and the structure and principle of the ball valve can refer to the prior art and are not unfolded any more.
More specifically, as shown in fig. 4, the sealer 23 includes: a seal cushion 232, a seal holder 231, and a seal cover 233. The sealing cushion 232 has a circular hole through which the detection probe 1 passes only, and the diameter of the circular hole is preferably smaller than that of the outer wall of the detection probe 1, so that the sealing cushion 232 is elastically deformed when the detection probe 1 passes through the circular hole to tightly wrap the outer wall of the detection probe 1, thereby ensuring the sealing performance in the detection process; one side of the sealing seat 231 is provided with threads and is connected with the threads of the tube seat 21 in a matching manner, the sealing cushion 232 is arranged on the other side of the sealing seat 231, the other side of the sealing seat 231 is also preferably provided with threads and is matched with the threads on the sealing cover 233, so that the edges of the sealing cushion 232 are clamped from the two sides of the sealing cushion 232, and further the fixing of the sealing cushion 232 is realized.
It should be noted that, a groove for placing the sealing cushion 232 may be preset between the sealing seat 231 and the sealing cover 233, and the groove may be separately provided on one of the sealing seat 231 and the sealing cover 233, or may be divided into two parts respectively provided on the sealing seat 231 and the sealing cover 233, and the groove is formed when the two parts are matched; as shown in fig. 4, the sealing seat 231 and the sealing cover 233 should be further provided with a channel for the detection probe 1 to pass through; the sealing seat 231 and the sealing cover 233 can also be used for fixing the sealing cushion 232 by the prior connection modes such as clamping grooves and clamping buckles; the sealing cushion 232 may be made of rubber or other materials with high temperature resistance, wear resistance and good elasticity.
The following specific embodiments are given here with respect to the structural configuration of the power section 3:
as shown in fig. 5, the power unit 3 includes: a movable frame 31, a guide 32, a support base 33, and a power source 34. The moving frame 31 is connected to the second end of the detection probe 1 and is disposed on the guide 32, so that the detection probe 1 can move along a fixed track on the guide 32, the support base 33 is used for supporting the guide 32, and the power source 34 is used for realizing the movement of the moving frame 31 along the guide 32.
Specifically, when detection is required, the power source 34 drives the movable frame 31 to move along the guide piece 32, so that the movable frame 31 drives the detection probe 1 to extend into the primary air powder pipe 01, when the detection through hole 11 is coincident with the detection point 011, the power source 34 controls the movable frame 31 to stop moving, after the detection of the detection point 011 is completed, the power source 34 drives the movable frame 31 to move so that the detection probe 1 reaches the next detection point 011 until all the detection points 011 complete detection, and when all the detection points 011 are completed and the detection probe 1 needs to be withdrawn, the power source 34 drives the movable frame 31 to reversely move along the guide piece 32, so that the movable frame 31 drives the detection probe 1 to withdraw from the primary air powder pipe 01, and the influence on the flow of coal dust caused by the fact that the detection probe 1 stays in the primary air powder pipe 01 after the detection is avoided.
Preferably, the guide 32 is a screw extending in a straight direction, the power source 34 is a motor and is connected to the screw to drive the screw to rotate clockwise and counterclockwise, the moving frame 31 is provided with a screw seat and is connected to the screw in a matching manner, and when the motor drives the screw to rotate on the supporting seat 33, the moving frame 31 is moved along the extending direction of the screw, so as to finally realize that the detection probe 1 advances and retreats the primary air-powder tube 01. Accordingly, as shown in fig. 6, a plurality of measuring points 011 in the primary air duct 01 should be selected along the same straight line, so that the detection probe 1 can reach each measuring point 011 along the extending direction of the screw rod.
For better technical effects, as shown in fig. 5, the output rotation speed and start-stop control of the motor are preferably controlled automatically by a PLC (Programmable Logic Controller ) controller 35, and of course, a remote operation control or other automatic controllers in the prior art may also be used to control the running state of the motor. Accordingly, the motor is preferably a stepper motor, wherein the stepper motor is an open loop control motor capable of converting an electric pulse signal into angular displacement or linear displacement; of course, other control motors that can be controlled by a controller such as the PLC controller 35 may also be used as the motors.
In order to realize the continuous control of the operation state of the motor, the PLC controller 35 may be connected to the upper computer 172 in the specific embodiment of the detection section, that is, when the upper computer 172 calculates the concentration and the particle size of the pulverized coal, the PLC controller 35 may automatically control the motor to rotate, so as to control the detection probe 1 to reach the point 011 where the detection is not completed when the detection is not performed at the point 011, and control the detection probe 1 to withdraw from the primary air-powder pipe 01 when all the points 011 are completed.
In addition to the method of moving the screw base by driving the screw by the motor, the power unit 3 may be configured to control the movement direction of the detection probe 1 and the primary air/powder tube 01 by other means such as a pneumatic rail, and the movement direction of the detection probe 1 is not developed.
The invention provides a pulverizing system, which mainly comprises: a coal mill for grinding coal briquettes into coal dust; the primary air-powder pipe 01 is connected with the coal mill, so that coal powder in the coal mill can reach the burner along the primary air-powder pipe 01 for combustion; the fan is connected with the coal mill and used for blowing coal dust in the coal mill, so that the coal dust can move along the primary air-dust pipe 01 until reaching the burner; and the device is connected with the primary air powder pipe 01 and used for detecting the concentration and the particle size of the pulverized coal.
The coal mill, the fan, the primary air duct 01 and other parts of the pulverizing system can refer to the prior art, and are not expanded herein.
The method for detecting the concentration and the particle size of the pulverized coal provided by the invention is shown in fig. 7, and comprises the following steps:
step S1: the sealing portion 2 is opened. The sealing part 2 is opened manually, remotely or automatically, so that the channel in the sealing part 2 is communicated with the primary air and powder pipe 01. According to the above-described embodiment regarding the sealing portion 2, specifically, as shown in fig. 4, the valve body 22 (i.e., ball valve) is opened to allow the passage in the stem 21 to communicate with the outside.
Step S2: the driving detection part stretches into the primary air powder pipe 01. The detection part (i.e. the detection probe 1) is driven through the channel in the sealing part 2 and extends into the primary air and powder tube 01 by remote control of the power part 3 or by automatic control of the power part 3.
According to the above-described embodiments of the detecting unit and the power unit 3, specifically, as shown in fig. 2, 3 and 5, the PLC controller 35 automatically controls the motor to start rotating, so that the moving frame 31 moves along the screw to drive the monitoring probe to sequentially extend into the sealing unit 2 and the primary air duct 01.
Step S3: the detection part is driven to reach a detection point 011 which is not detected in the primary air-powder pipe 01, and detection data are collected to obtain the particle size and concentration of coal powder at the current detection point 011.
The detection part is driven to reach a measuring point 011 where the detection is required in the primary air and powder pipe 01 by remote control of the power part 3 or automatic control of the power part 3, and the detection part is stopped to keep the position of the detection part unchanged, so that the detection part detects the current measuring point 011 to obtain detection data, and the concentration and the particle size of coal powder at the current measuring point 011 are obtained according to the detection data.
According to the above-mentioned embodiments related to the detection portion and the power portion 3, as shown in fig. 2, 3 and 5, when the PLC controller 35 controls the motor to drive the screw to rotate for a certain time or a certain number of revolutions, the moving frame 31 drives the detection probe 1 to move to a point 011 where detection is required in the primary air-powder tube 01, the PLC controller 35 controls the motor to stop running, so that the position of the detection through hole 11 at the first end of the detection probe 1 is fixed at the point 011, parallel incident light is emitted to the measurement area through the laser emitter portion, and the optical signal is collected through the photoelectric converter 15 and converted into an electrical signal, and the signal processor 17 obtains the electrical signal and converts the electrical signal into a digital signal, and calculates the concentration and particle size of the pulverized coal at the current point 011 according to the light transmittance pulsation method.
Step S4: judging whether all measuring points 011 in the primary air-powder pipe 01 finish detection, if not, returning to the step S3; if yes, go to step S5. If the detection is not performed on all the detection points 011 in the primary air duct 01, the process returns to the step S3 to detect the detection points 011 which are not detected yet until the coal dust concentration and the particle size at all the detection points 011 in the primary air duct 01 are obtained, and the process proceeds to the step S5.
Step S5: the driving detection part is separated from the primary air powder pipe 01 and the sealing part 2 in sequence. The detection part is driven to leave the primary air-powder pipe 01 and the sealing part 2 in sequence by remote control of the power part 3 or automatic control of the power part 3, so that adverse influence on the flow of coal powder caused by the fact that the detection part (namely the detection probe 1) stays in the primary air-powder pipe 01 after detection is completed is avoided.
According to the above-described embodiments of the detecting unit and the power unit 3, as shown in fig. 2,3 and 5, the PLC controller 35 controls the motor to drive the screw to rotate reversely, so that the moving frame 31 drives the detecting probe 1 to move along the direction of withdrawing the primary air-powder tube 01 until the detecting probe 1 is completely withdrawn from the sealing unit 2.
Step S6: closing the sealing part 2. The sealing part 2 is closed manually, remotely or automatically to seal the channel in the sealing part 2, so that the primary air and powder pipe 01 is prevented from being communicated with the outside, and the pulverized coal in the primary air and powder pipe 01 is prevented from leaking. According to the above-described embodiment with respect to the sealing portion 2, specifically, as shown in fig. 4, the valve body 22 (i.e., the ball valve) is closed to avoid communication of the passage in the stem 21 with the outside.
As shown in fig. 7, step S0 is further included before step S3: the distribution of measuring points 011 in the primary air duct 01 is determined. According to the related knowledge of fluid mechanics, the velocity distribution of the fluid in the pipeline along the radial direction is different, so in order to accurately obtain the average concentration of the pulverized coal in the primary air-pulverized pipe 01 and the particle size of the pulverized coal, a plurality of measuring points 011 need to be arranged along the radial direction of the primary air-pulverized pipe 01.
According to the above-described embodiment of the power unit 3, as shown in fig. 6, the plurality of measuring points 011 are selected along the same straight line, so that the detecting unit can move along the straight line to reach each measuring point 011. Since the parameters of the pulverized coal on the left and right sides in the primary air duct 01 may be different, all the measuring points 011 are preferably distributed along the diameter direction of the primary air duct 01, and the positions of the measuring points 011 are symmetrical with respect to the axis of the primary air duct 01, that is, the number of the measuring points 011 on the two sides with respect to the axis is the same.
As shown in fig. 6, the position of the measuring point 011 may be preferably determined by a uniform cross-section annular method, that is, a plurality of adjacent annular rings and a circle located at the center are configured with respect to the axis of the primary air duct 01, the annular rings and the circle have the same area, and the intersection point between the edges of the annular rings and the circle and the diameter of the primary air duct 01 is determined as the measuring point 011. Of course, the location of the measurement point 011 can be selected in other ways, and is not expanded herein.
In addition, the number of the rings may be four, that is, ten measuring points 011 as shown in fig. 6, and of course, three, five or other numbers may be provided for the rings.
It should be noted that, in the above step S4, according to the above specific embodiment of the power unit 3, the PLC controller 35 can control the operation state of the motor by programming, that is, the PLC controller 35 can be programmed according to the distribution of the measuring points 011 as shown in fig. 6, so as to control the motor to operate to make the detecting probe 1 reach each measuring point 011 in turn for detection, and make the detecting probe 1 withdraw from the primary air duct 01 when all the measuring points 011 finish detection.
In other words, when the distribution condition of the measurement points 011 is known, the detection probe 1 is automatically controlled to move to the next measurement point 011 by the preset program of the PLC controller 35 when the detection probe 1 completes the detection of one measurement point 011, so as to complete the judgment that the measurement points 011 do not detect; when the last measuring point 011 finishes detection, the detection probe 1 is controlled to move out of the primary air-powder pipe 01, so that the judgment that all the measuring points 011 finish detection is realized.
Of course, the "judging" action in the present step S4 may also be implemented by a record of the field staff or other ways of knowing the number of the measurement points 011 where the detection has been completed.
In the description of the present invention, the directions or positional relationships indicated by "left" and "right" and the like are used based on the directions or positional relationships shown in the drawings, and are merely for convenience of describing the present invention and for simplifying the description, and do not limit the specific directions of the elements or portions to be referred to, and thus should not be construed as limiting the present invention. Furthermore, in the present description, relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The pulverizing system, the device and the method for detecting the concentration and the particle size of the pulverized coal are described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (6)
1. A device for detecting the concentration and particle size of pulverized coal, comprising:
a detection part which is used for extending into the primary air powder pipe (01) and detecting the concentration and the particle size of the coal powder in the primary air powder pipe (01);
a power part (3) connected with the detection part and used for driving the detection part to extend into and leave from the primary air-powder pipe (01);
a sealing part (2) which is connected with the primary air powder pipe (01) and is used for sealing the detection part and the primary air powder pipe (01) when in detection and preventing the pulverized coal in the primary air powder pipe (01) from leaking to the outside when no detection is needed;
The detection unit includes:
A tubular detection probe (1); the first end of the detection probe (1) is used for penetrating through the sealing part (2) and extending into the primary air-powder pipe (01), a detection through hole (11) for flowing pulverized coal is formed in the first end of the detection probe (1), and the second end of the detection probe (1) is connected with the power part (3);
a laser emitter connected to the detection probe (1) for emitting laser light to the detection through hole (11);
A transmitted light processing sub-section connected to the detection probe (1) for receiving the laser light passing through the detection through hole (11) and calculating the concentration and particle size of pulverized coal;
the transmitted light processing sub-section includes:
A photoelectric converter (15) arranged at the first end of the detection probe (1) and used for receiving the laser transmitted through the detection through hole (11) and converting the laser into an electric signal;
A signal processor (17) electrically connected with the photoelectric converter (15) and used for acquiring an electric signal sent by the photoelectric converter (15) and calculating to obtain the concentration and the particle size of the pulverized coal;
the signal processor (17) comprises:
A signal collector (171) for receiving the electric signal emitted from the photoelectric converter (15) and analyzing the electric signal into a digital signal;
An upper computer (172) for receiving the digital signal through a data line and calculating the concentration and the particle size of the pulverized coal in real time;
the power unit (3) comprises:
A mobile frame (31) connected to the second end of the detection probe (1);
A guide member (32) connected to the movable frame (31) for restricting a movement direction of the movable frame (31);
a support base (33) connected to the guide member (32) for supporting the guide member (32);
A power source (34) for effecting movement of the moving frame (31) along the guide (32);
the power source (34) is specifically a motor and is automatically controlled by the PLC (35), the PLC (35) is connected to the upper computer (172) so that when the upper computer (172) calculates the concentration and the particle size of coal dust, the PLC (35) can automatically control the motor to rotate, so that when the detection point (011) is not detected, the detection probe (1) is controlled to reach the detection point (011) which is not detected yet, and when all the detection points (011) are detected, the detection probe (1) is controlled to withdraw from the primary air-dust pipe (01);
The seal part (2) includes:
A tube seat (21) communicated with the primary air-powder tube (01) and used for the detection probe (1) to pass through and extend into the primary air-powder tube (01);
The valve body (22) is arranged in the tube seat (21) and is used for being opened when detection is needed so that the detection probe (1) sequentially stretches into the tube seat (21) and the primary air powder tube (01), and is closed when detection is not needed so as to avoid leakage of pulverized coal, and the tube seat (21) is provided with two sections and is respectively arranged at two ends of the valve body (22);
a sealer (23) connected to the stem (21) for avoiding leakage of pulverized coal when the valve body (22) is opened, the sealer (23) being for gripping an outer wall of the detection probe (1) when the valve body (22) is opened and the detection probe (1) is located in the sealing portion (2);
The sealer (23) includes:
A sealing cushion (232) for passing only the detection probe (1), the sealing cushion (232) having a circular hole with a diameter smaller than the diameter of the outer wall of the detection probe (1);
a seal holder (231) connected to the stem (21) for supporting the seal cushion (232);
A sealing cover (233) connected to the sealing support (231) for fixing the sealing cushion (232);
Wherein the sealing support (231) and the sealing cover (233) are respectively arranged at two sides of the sealing cushion (232) so as to clamp the edge of the sealing cushion (232);
A groove for placing the sealing cushion (232) is arranged between the sealing support (231) and the sealing cover (233); the seal support (231) and the seal cover (233) are also provided with a channel for the detection probe (1) to penetrate.
2. The apparatus of claim 1, wherein the device comprises a plurality of sensors,
The laser emitting sub-section includes:
a laser emitter (12) for emitting laser light;
An optical fiber (13) arranged in the detection probe (1) and used for conducting laser emitted by the laser emitter (12) to the first end of the detection probe (1);
the laser collimator (14) is arranged at the first end of the detection probe (1) and connected with the optical fiber (13) and is used for receiving laser and correcting the laser into a beam of parallel light to irradiate the detection through hole (11);
the photoelectric converter (15) and the laser collimator (14) are respectively arranged at two sides of the detection through hole (11), and the laser collimator (14) is far away from the first end of the detection probe (1) relative to the photoelectric converter (15).
3. The apparatus according to claim 2, wherein the detecting section further includes:
the first optical lens (18) is arranged on one side of the detection through hole (11) close to the laser collimator (14) and is used for preventing the laser collimator (14) from contacting with pulverized coal;
And a second optical lens (19) which is arranged on one side of the detection through hole (11) close to the photoelectric converter (15) and is used for preventing the photoelectric converter (15) from contacting with pulverized coal.
4. The apparatus of claim 1, wherein the device comprises a plurality of sensors,
The guide (32) is in particular a threaded spindle;
The power source (34) is specifically a motor, and the motor is connected with the screw rod to drive the screw rod to rotate;
The movable frame (31) is provided with a screw seat matched with the screw rod.
5. A pulverizing system, comprising:
a coal mill for grinding coal briquettes into coal dust;
the primary air-powder pipe (01) is connected with the coal mill and used for feeding coal powder into the burner;
the fan is connected with the coal mill and used for blowing coal dust into the primary air-dust pipe (01);
A device for detecting the concentration and the particle size of pulverized coal according to any one of claims 1 to 4, which is connected to the primary air-powder pipe (01).
6. A method for detecting the concentration and the particle size of pulverized coal using the apparatus for detecting the concentration and the particle size of pulverized coal according to any one of claims 1 to 4, comprising:
s1: opening the sealing part (2);
S2: the driving detection part stretches into the primary air-powder pipe (01);
S3: driving the detection part to reach a measuring point (011) which is not detected in the primary air-powder pipe (01), and collecting detection data to obtain the particle size and concentration of coal powder at the current measuring point (011);
s4: judging whether all measuring points (011) in the primary air and powder pipe (01) are detected, if not, returning to the step S3, and if so, entering the step S5;
S5: driving the detection part to leave the primary air and powder pipe (01) and the sealing part (2) in sequence;
S6: closing the seal (2).
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| CN112649332B (en) * | 2020-12-30 | 2024-08-02 | 东北电力大学 | Online detection device and method for coal particle size distribution of power plant |
| CN114459829B (en) * | 2022-01-26 | 2024-02-06 | 国电长源汉川第一发电有限公司 | Online sampling device and method for air-powder tube suitable for optical detection technology |
| CN115144308B (en) * | 2022-05-24 | 2024-07-09 | 华南理工大学 | Device and method for measuring average particle size of pulverized coal |
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