CN213541647U - Pulverized coal speed monitoring device - Google Patents
Pulverized coal speed monitoring device Download PDFInfo
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- CN213541647U CN213541647U CN202021699858.9U CN202021699858U CN213541647U CN 213541647 U CN213541647 U CN 213541647U CN 202021699858 U CN202021699858 U CN 202021699858U CN 213541647 U CN213541647 U CN 213541647U
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- 239000003245 coal Substances 0.000 title claims abstract description 43
- 238000012806 monitoring device Methods 0.000 title claims abstract description 15
- 239000000523 sample Substances 0.000 claims abstract description 55
- 238000012545 processing Methods 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 6
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 32
- 238000005259 measurement Methods 0.000 abstract description 16
- 238000009532 heart rate measurement Methods 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 239000002817 coal dust Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- 230000010349 pulsation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000005514 two-phase flow Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000739 chaotic effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010219 correlation analysis Methods 0.000 description 1
- 238000005314 correlation function Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to the technical field of monitoring devices, in particular to a pulverized coal speed monitoring device, which comprises a control device, an air source protection cabinet, an air source pipe, a junction box, a measuring device and a cable; the gas source protection cabinet and the measuring device are electrically connected with the junction box, the junction box is electrically connected with the control device through a cable, the measuring device comprises a probe and a probe fixing piece, a laser and a photoelectric signal measuring element are arranged in the probe, a measuring hole is formed in the side portion of the probe, the laser and the photoelectric signal measuring element are respectively located on two sides of the measuring hole, the laser and the photoelectric signal measuring element are both electrically connected with the junction box, the probe is arranged on the probe fixing piece, a vent hole communicated with the interior of the probe is formed in the probe fixing piece, a gas pipe is connected between the vent hole and the gas source protection cabinet, and the gas source pipe; the probe is designed to be used as a part for measurement, is arranged in a pulverized coal pipe of a boiler, and carries out laser pulse measurement on pulverized coal particles in the pulverized coal pipe to obtain measurement data of the pulverized coal speed.
Description
Technical Field
The utility model belongs to the technical field of the monitoring devices technique and specifically relates to a buggy speed monitoring devices is related to.
Background
With the increasing environmental protection requirements and the improvement of power plant economics, there is a pressing need to optimize the combustion of coal-fired power plants to improve combustion efficiency, reduce the emission of soot and NOx, SO2, and reduce the energy consumption of the pulverizing system. The proper concentration, speed and fineness are required in the operation process of the boiler pulverizing system; the concentration of the pulverized coal directly influences the uniformity of powder feeding in the air pipe, the stability of the working condition in the furnace and the combustion efficiency of the boiler; if the fineness of the pulverized coal is too large or too small, the loss of incomplete combustion of machinery is increased, the efficiency of a boiler is reduced, the energy consumption of a coal mill is increased, and the like. In addition, when the pulverized coal pipeline is not designed, installed and operated properly, the pulverized coal pipeline can be blocked, and in severe cases, the unit is forced to reduce the load or even shut down to eliminate the blockage. This will cause great economic loss to the power plant, influence the safe operation of unit.
Therefore, the on-line monitoring of the pulverized coal has important significance for optimizing the combustion process, improving the boiler efficiency, reducing the operation energy consumption of the coal mill, reducing the pollution emission and the like.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an it is not enough to overcome above-mentioned condition, aims at providing the technical scheme that can solve above-mentioned problem.
A coal powder speed monitoring device comprises a control device, an air source protection cabinet, an air source pipe, a junction box, a measuring device and a cable; the gas source protection cabinet and the measuring device are electrically connected with the junction box, the junction box is electrically connected with the control device through a cable, the measuring device comprises a probe and a probe fixing piece, a laser and a photoelectric signal measuring element are arranged in the probe, a measuring hole is formed in the side portion of the probe, the laser and the photoelectric signal measuring element are respectively located on two sides of the measuring hole, the laser and the photoelectric signal measuring element are both electrically connected with the junction box, the probe is arranged on the probe fixing piece, a vent hole communicated with the interior of the probe is formed in the probe fixing piece, a gas pipe is connected between the vent hole and the gas source protection cabinet, and the gas source pipe; the control device comprises a control cabinet, a display, a signal generation and driving unit and a signal acquisition and processing unit, wherein the display, the signal generation and driving unit and the signal acquisition and processing unit are arranged in the control cabinet, and the display and the signal generation and driving unit are respectively and electrically connected with the signal acquisition and processing unit.
Preferably, an air filter for filtering air is connected between the air source protection cabinet and the air source pipe.
Preferably, the probe is of a cylindrical configuration and the measurement aperture is located at an end remote from the probe mount.
Preferably, the control device further comprises a printer, the printer is arranged in the control cabinet, and the printer is electrically connected with the signal acquisition and processing unit.
Preferably, the air source protection cabinet comprises an air source cabinet, one end of the air source cabinet is provided with an air inlet, and the air inlet is connected to the air source pipe; the other end of the gas source cabinet is provided with a plurality of gas outlets which are arranged in an array, the gas outlets are used for being connected with a measuring device, an electromagnetic valve is arranged between each gas outlet and each gas inlet, and the electromagnetic valves are electrically connected with the junction box.
Preferably, the junction box comprises a box body, a plurality of probe interfaces arranged in an array are arranged at the front end of the box body, and the junction box is electrically connected with the measuring device through the probe interfaces; the rear end of the box body is provided with an air source control port and a communication port, the air source control port is electrically connected with the air source protection cabinet, and the communication port is electrically connected with a cable.
Compared with the prior art, the beneficial effects of the utility model are that:
the probe is designed to be used as a part for measurement, the probe is arranged in a pulverized coal pipe of a boiler, and laser pulsation measurement is carried out on pulverized coal particles in the pulverized coal pipe to obtain measurement data of the pulverized coal speed; through the data, the pulverized coal can be monitored on line, so that the combustion process is optimized, the boiler efficiency is improved, the operation energy consumption of the coal mill is reduced, the pollution emission is reduced, and the combustion stability and safety of the boiler are improved. Will bring considerable economic benefits to the power plant.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of the measuring device of the present invention.
Fig. 3 is a block diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 to 3, in an embodiment of the present invention, a pulverized coal speed monitoring device includes a control device 10, an air source protection cabinet 20, an air source pipe 23, a junction box 16, a measuring device 30, and a cable; the gas source protection cabinet 20 and the measuring device 30 are electrically connected with the junction box 16, the junction box 16 is electrically connected with the control device 10 through a cable, the measuring device 30 comprises a probe 34 and a probe fixing piece 33, a laser 31 and a photoelectric signal measuring element 32 are arranged in the probe 34, a measuring hole 36 is arranged on the side portion of the probe 34, the laser 31 and the photoelectric signal measuring element 32 are respectively positioned on two sides of the measuring hole 36, the laser 31 and the photoelectric signal measuring element 32 are both electrically connected with the junction box 16, the probe 34 is arranged on the probe fixing piece 33, a vent hole 35 communicated with the interior of the probe 34 is arranged on the probe fixing piece 33, a gas pipe is connected between the vent hole 35 and the gas source protection cabinet 20, and the gas source pipe 23; the control device 10 comprises a control cabinet 11, a display 12 arranged in the control cabinet 11, a signal generating and driving unit 15 and a signal collecting and processing unit 13, wherein the display 12 and the signal generating and driving unit 15 are respectively electrically connected with the signal collecting and processing unit 13.
In the above technical means, the air source pipe 23 is used for connecting an air compressor to provide compressed air for the air source protection cabinet 20, the air source protection cabinet 20 is used for supplying an air source to the measuring device 30, the measuring device 30 is used for speed monitoring of pulverized coal in a boiler, the probe 34 is designed to be a part for measurement, the probe 34 is installed in a pulverized coal pipe of the boiler, and laser pulse measurement is performed on pulverized coal particles in the pulverized coal pipe to obtain measurement data of the pulverized coal speed; through the data, the pulverized coal can be monitored on line, so that the combustion process is optimized, the boiler efficiency is improved, the operation energy consumption of the coal mill is reduced, the pollution emission is reduced, and the combustion stability and safety of the boiler are improved. Considerable economic benefits can be brought to the power plant;
this application is still through design junction box 16, buggy speed monitoring devices will concentrate on junction box 16 from the signal cable line that each probe 34 comes, then receive controlling means 10 from junction box 16 to handle and send relevant monitored control system, when carrying out field operation, mark the sampling point to the comparatively even position of buggy pipe mixture earlier, then install junction box 16 and air supply cabinet near the sampling point, rethread cable connection controlling means 10, can effectively practice thrift the space wiring, prevent that the chaotic influence monitoring efficiency of wiring from laying wire.
As further shown in fig. 1, an air filter 22 for filtering air is connected between the air source protection cabinet 20 and the air source pipe 23; considering that the system needs to operate continuously for a long time, the compressed air provided by the air compressor of the power plant inevitably carries moisture and oil, and the moisture and oil pollute the laser 31, the photoelectric signal measuring element 32 and the measuring hole 36 in the probe 34 after a long time, so that the performance of the probe 34 is reduced, and the measurement is influenced; for this purpose, an air filter 22 is provided in the system to further filter the compressed air to completely remove water and oil from the compressed air, thereby ensuring long-term normal operation of the probe 34.
As further shown in fig. 2, the probe 34 is a cylinder structure, and the measuring hole 36 is located at an end far from the probe fixing member 33, so as to improve the measuring efficiency.
As further shown in fig. 1, the control device 10 further includes a printer 14, the printer 14 is disposed in the control cabinet 11, and the printer 14 is electrically connected to the signal acquisition and processing unit 13; the monitored speed data can be printed on-site by the printer 14 for occasional use.
As further shown in fig. 1, the air source protection cabinet 20 includes an air source cabinet, one end of which is provided with an air inlet 24, and the air inlet 24 is connected to an air source pipe 23; the other end of the air source cabinet is provided with a plurality of air outlets 21 which are arranged in an array, the air outlets 21 are used for being connected with a measuring device 30, an electromagnetic valve is arranged between each air outlet 21 and the air inlet 24, and the electromagnetic valves are electrically connected with the junction box 16.
As further shown in fig. 1, the junction box 16 includes a box body, a plurality of probe interfaces 161 arranged in an array are disposed at a front end of the box body, and the junction box 16 is electrically connected to the measuring device 30 through the probe interfaces 161; the rear end of the box body is provided with an air source control port 163 and a communication port 162, the air source control port 163 is electrically connected with the air source protection cabinet 20, and the communication port 162 is electrically connected with a cable.
To further illustrate the content of the present application, the principle of the apparatus of the present application will be explained from the following:
the laser pulse method principle is adopted, when a beam of laser irradiates coal dust particles flowing in the coal dust pipe, transmitted light penetrating through coal dust can be attenuated due to absorption and scattering of the coal dust particles to the light. Since the size and number of the pulverized coal particles flowing through the light measuring region are randomly changed, the value of the transmitted light intensity is also changed accordingly. The average particle size of the coal powder can be measured by analyzing the random change by applying an optical pulse theory; the structure that this application adopted is probe 34, through set up measuring hole 36 on probe 34, adopts laser 31 and photoelectric signal measuring element 32 to measure the buggy through measuring hole 36.
According to the principle of extinction particle measurement, when a beam of parallel monochromatic light irradiates a particle to be measured, the light intensity of the transmitted light is attenuated due to the scattering and absorption of the particle to the light, which can be described by Lambert-Beer law:
where I is the transmitted intensity, I0 is the incident intensity, L is the travel of the measuring beam in the measuring zone, N is the particle concentration per unit volume, D is the average particle size of the particles, and E is the extinction coefficient, which is a complex function of the incident light wavelength L, the average particle size D of the particles, and the relative refractive index m of the particles, and can be found by Mie's theory.
In general, the diameter of the measuring beam is much larger than the particle size and the volume of the measuring zone is large, so that the number of particles in the measuring zone is quite large. Although the number of the pulverized coal particles continuously flowing through the measurement region is slightly changed, it is considered that the number of the pulverized coal particles in the measurement region is substantially kept constant at the time of measurement. If small fluctuation of I is caused by small change of the number or granularity of the coal dust particles in the measuring area, measures such as measuring for many times and taking an average value are generally adopted to eliminate the influence.
Assuming that the cross-sectional area of the measuring beam is a and the volume of the measuring region is equal to AL, equation (1) can be rewritten as follows:
here, the
Is the number of particles in the measurement zone. If the cross-sectional area a of the beam is reduced, which reduces the volume of the measuring region, the number of particles in the measuring region is reduced accordingly. Because the pulverized coal particles are in a flowing state, if A is reduced to a certain degree, the number of the pulverized coal particles flowing through the measuring area can not be considered to be basically kept unchanged, but presents randomness along with the change of time, more time is less, and the random pulsation degree of the transmitted light intensity I is enhanced; since the pulsation is caused by the variation in the number and size of the pulverized coal particles in the measurement region, it isThe particle size and concentration information of the particles is included, and the fineness of the coal dust particles can be obtained by analyzing the signal pulsation.
Although there are many methods for measuring the velocity of gas-solid two-phase flow, each method has characteristics and application range, and can be directly used for high-concentration gas-solid two-phase flow on site, for example, the technique for measuring the velocity of pulverized coal is not many; based on the principle of correlation velocity measurement, if a sequence of some physical quantities related to the particle velocity between 2 points in the flow field, which changes with time, can be measured, and the velocity of the particle is assumed to be constant between the 2 points, the correlation function of the 2 time sequences is obtained by using a correlation analysis method, so that the velocity of the particle can be obtained.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. A coal powder speed monitoring device is characterized by comprising a control device, an air source protection cabinet, an air source pipe, a junction box, a measuring device and a cable; the gas source protection cabinet and the measuring device are electrically connected with the junction box, the junction box is electrically connected with the control device through a cable, the measuring device comprises a probe and a probe fixing piece, a laser and a photoelectric signal measuring element are arranged in the probe, a measuring hole is formed in the side portion of the probe, the laser and the photoelectric signal measuring element are respectively located on two sides of the measuring hole, the laser and the photoelectric signal measuring element are both electrically connected with the junction box, the probe is arranged on the probe fixing piece, a vent hole communicated with the interior of the probe is formed in the probe fixing piece, a gas pipe is connected between the vent hole and the gas source protection cabinet, and the gas source pipe; the control device comprises a control cabinet, a display, a signal generation and driving unit and a signal acquisition and processing unit, wherein the display, the signal generation and driving unit and the signal acquisition and processing unit are arranged in the control cabinet, and the display and the signal generation and driving unit are respectively and electrically connected with the signal acquisition and processing unit.
2. The pulverized coal speed monitoring device according to claim 1, wherein an air filter for filtering air is connected between the air source protection cabinet and the air source pipe.
3. The pulverized coal speed monitoring device according to claim 1, wherein the probe is of a cylindrical structure, and the measuring hole is located at one end far away from the probe fixing member.
4. The pulverized coal speed monitoring device according to claim 1, wherein the control device further comprises a printer, the printer is arranged in the control cabinet, and the printer is electrically connected with the signal acquisition and processing unit.
5. The pulverized coal speed monitoring device according to claim 1, wherein the gas source protection cabinet comprises a gas source cabinet, one end of the gas source cabinet is provided with a gas inlet, and the gas inlet is connected to a gas source pipe; the other end of the gas source cabinet is provided with a plurality of gas outlets which are arranged in an array, the gas outlets are used for being connected with a measuring device, an electromagnetic valve is arranged between each gas outlet and each gas inlet, and the electromagnetic valves are electrically connected with the junction box.
6. The pulverized coal speed monitoring device according to claim 1, wherein the junction box comprises a box body, a plurality of probe interfaces arranged in an array are arranged at the front end of the box body, and the junction box is electrically connected with the measuring device through the probe interfaces; the rear end of the box body is provided with an air source control port and a communication port, the air source control port is electrically connected with the air source protection cabinet, and the communication port is electrically connected with a cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021699858.9U CN213541647U (en) | 2020-08-15 | 2020-08-15 | Pulverized coal speed monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021699858.9U CN213541647U (en) | 2020-08-15 | 2020-08-15 | Pulverized coal speed monitoring device |
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| Publication Number | Publication Date |
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| CN213541647U true CN213541647U (en) | 2021-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021699858.9U Expired - Fee Related CN213541647U (en) | 2020-08-15 | 2020-08-15 | Pulverized coal speed monitoring device |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112097236A (en) * | 2020-09-24 | 2020-12-18 | 尚尔发 | Automatic energy-saving control system of electrical engineering suitable for thermal power plant |
-
2020
- 2020-08-15 CN CN202021699858.9U patent/CN213541647U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112097236A (en) * | 2020-09-24 | 2020-12-18 | 尚尔发 | Automatic energy-saving control system of electrical engineering suitable for thermal power plant |
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Granted publication date: 20210625 |