CN107907185B - Material level detection system in incineration hopper and application method thereof - Google Patents
Material level detection system in incineration hopper and application method thereof Download PDFInfo
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- CN107907185B CN107907185B CN201711418790.5A CN201711418790A CN107907185B CN 107907185 B CN107907185 B CN 107907185B CN 201711418790 A CN201711418790 A CN 201711418790A CN 107907185 B CN107907185 B CN 107907185B
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- 239000000463 material Substances 0.000 title claims abstract description 92
- 238000001514 detection method Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000523 sample Substances 0.000 claims abstract description 45
- 238000002310 reflectometry Methods 0.000 claims abstract description 30
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims description 37
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000010420 art technique Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2965—Measuring attenuation of transmitted waves
Abstract
The invention discloses a material level detection system in an incineration hopper and a use method thereof, wherein the system comprises the hopper and a material level detection probe; the hopper is a funnel-shaped container with a downward tip, and an opening is arranged at the top of the hopper; the inner wall of the hopper is made of metal; the material level detection probe is arranged obliquely above the hopper, and faces to the inner wall of the hopper; the material level detection probe is used for emitting a signal beam to the inner wall of the hopper and determining the material level in the hopper according to the signal intensity of the reflected beam of the inner wall of the hopper. The invention has the advantages that the inner wall of the hopper made of metal has stronger and stable reflectivity for signal beams, unlike low-reflectivity materials such as household garbage, plant stalks and the like; the shielding condition of the inner wall of the detection hopper is adopted to detect the material level in the hopper, so that measurement errors caused by weak and unstable reflectivity of the low-reflectivity material can be avoided.
Description
Technical Field
The invention belongs to the field of environmental protection equipment, and particularly relates to a material level detection system in an incineration hopper and a use method thereof.
Background
There are many well-established prior art techniques for detecting the level of a liquid in a container, such as radar, ultrasound, laser, capacitance, locked rotor, weight, radiation, etc., but they are generally used for detecting the level of a solid particle or a liquid. According to current market statistics, the measurement results of the detection technology are generally inaccurate.
Most of materials using electromagnetic wave or ultrasonic detection principle need a compact reflecting surface on the surface. Many objects such as plant stems, garbage and the like loose uneven materials are arranged, the material surface is not provided with a compact reflecting surface, the incident wave is reflected on the material surface of the highest layer, does not block the incident wave by the highest layer and goes down, and is contacted with the material surface of a lower point and reflected back, and the part of the reflected wave is blocked by the material of the highest layer and is not reflected back. The more the lower layer is, the more easily reflected waves are blocked. Therefore, only the refuse near the surface of the material will reflect some echoes back with low reflectivity. Due to the non-uniformity of the materials, the same material height, the change of the reflected wave will be large, which will greatly reduce the reliability of detection, resulting in that the material level cannot be accurately measured according to the intensity of the reflected wave.
In a garbage incineration field, the material level of a charging hole of an incinerator should be kept relatively stable, and too low can cause the furnace fire to run out from a hopper to cause accidents. Too high may cause material blockage. In the automatic feeding mode of the incinerator, the material level detection control of the feeding port is particularly important, and the automatic feeding can be realized or the system is safe and smooth.
Disclosure of Invention
According to the defects of the prior art, the invention provides a material level detection system in an incineration hopper and a use method thereof, wherein the detection system calculates the material level in the hopper by measuring the shielding state of the inner wall of the hopper made of metal materials, so that the problem that the reflected wave intensity of low-reflectivity materials is difficult to determine is solved.
The invention is realized by the following technical scheme:
a level detection system within an incineration hopper, the level detection system comprising a hopper and a level detection probe; the hopper is a funnel-shaped container with a downward tip, and an opening is arranged at the top of the hopper; the inner wall of the hopper is made of metal; the material level detection probe is arranged obliquely above the hopper, and faces to the inner wall of the hopper; the material level detection probe is used for emitting a signal beam to the inner wall of the hopper and determining the material level in the hopper according to the signal intensity of the reflected beam of the inner wall of the hopper.
The beam emission direction sent by the material level detection probe is perpendicular to the inner wall of the hopper, and the positive and negative deviation of the angle is less than or equal to 30 degrees.
The hopper is used for containing low-reflectivity materials.
The material level detection probe comprises a beam transmitting module and a reflected beam receiving module; the reflected beam receiving module comprises a beam signal conversion module, a window filtering module and a reflected beam intensity measuring module which are connected in sequence; the window filtering module is used for filtering the reflected beam received too early or too late.
The beam transmitting module is an ultrasonic transmitting module, and the beam signal converting module is an ultrasonic receiver; the beam transmitting module and the window filtering module are synchronized through clock signals.
The beam transmitting module is a radio wave transmitting module; the beam transmitting module outputs the radio waves transmitted by the beam transmitting module to the window filtering module so that the window filtering module and the beam transmitting module are synchronized.
A method of using a level detection system in an incineration hopper, the method comprising the steps of: mounting a material level detection probe to the obliquely upper part of the hopper; calibrating the opening time and closing time of the window filtering module; the level detection probe is used to detect the level of the material in the hopper at predetermined intervals.
Calibrating the opening time and the closing time of the window filtering module comprises the following steps: calculating the maximum propagation time and the minimum propagation time of the signal beam from the material level detection probe to the inner wall of the hopper according to the propagation speed of the signal beam, the shape and the size of the inner wall of the hopper and the distance between the material level detection probe and the inner wall of the hopper; and taking twice of the maximum propagation time as the closing time of the window filtering module and taking the minimum propagation time as the opening time of the window filtering module.
The method for detecting the material level in the hopper by using the material level detection probe specifically comprises the following steps: the beam emission module of the material level detection probe emits the signal beam to the inner wall of the hopper, and the signal beam forms the reflected beam after being reflected by the inner wall of the hopper and the low-reflectivity material in the hopper; the beam signal conversion module converts the reflected beam into an electric signal and transmits the electric signal to the window filtering module; the window filtering module filters the electric signals of the reflected wave beams and transmits the filtered electric signals to the reflected wave beam intensity measuring module; the reflected beam intensity measurement module measures the intensity of the reflected beam according to the filtered electrical signal and determines the level of the material in the hopper according to the intensity of the reflected beam.
The invention has the advantages that the inner wall of the hopper made of metal has stronger and stable reflectivity for signal beams, unlike low-reflectivity materials such as household garbage, plant stalks and the like; the shielding condition of the inner wall of the detection hopper is adopted to detect the material level in the hopper, so that measurement errors caused by weak and unstable reflectivity of the low-reflectivity material can be avoided.
Drawings
FIG. 1 is a schematic diagram of the structure of a material level detection system in an incineration hopper according to the present invention;
FIG. 2 is a block diagram showing the structure of a level detecting probe according to embodiment 1 of the present invention;
FIG. 3 is a block diagram showing the structure of a level detecting probe according to embodiment 2 of the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings, to facilitate understanding by those skilled in the art:
as shown in fig. 1-3, reference numerals 1-10 are respectively: the device comprises a hopper 1, a material level detection probe 2, a hopper inner wall 3, a low-reflectivity material 4, a beam emitting module 5, a reflected beam receiving module 6, a beam signal conversion module 7, a window filtering module 8, a reflected beam intensity measuring module 9 and a timing module 10.
Example 1: as shown in fig. 1, the present embodiment relates specifically to a material level detection system in an incineration hopper, which includes a hopper 1 and a material level detection probe 2; the hopper 1 is a funnel-shaped container with a downward tip and is used for containing low-reflectivity materials; the inner wall 3 of the hopper 1 is made of metal; the material level detection probe 2 is arranged obliquely above the hopper 1, and the material level detection probe 2 faces the inner wall 3 of the hopper 1; the level detection probe 2 is adapted to emit a signal beam towards the inner wall 3 of the hopper 1 and to determine the level of the low reflectivity material 4 in the hopper 1 from the signal strength of the reflected beam of the inner wall 3.
As shown in fig. 1 and 2, the level detection probe 2 includes a beam transmitting module 5 and a reflected beam receiving module 6; the reflected beam receiving module 6 comprises a beam signal conversion module 7, a window filtering module 8 and a reflected beam intensity measuring module 9 which are connected in sequence; the beam emitting module 5 of the level detecting probe 2 is configured to emit a signal beam to the inner wall 3 of the hopper 1, and in this embodiment, the beam emitting module 5 is a radio wave emitting module, the emitted signal beam is an electromagnetic wave, and the wavelength of the signal beam is located in a millimeter wave band.
As shown in fig. 1 and 2, for the signal beam in the millimeter wave band, the inner wall 3 of the hopper has strong reflectivity, and the reflectivity of the inner wall 3 of the hopper made of metal for millimeter waves is as high as 95 to 98 percent; however, the low-reflectivity material 4 contained in the hopper 1 can almost completely absorb the signal beam emitted by the level detection probe 2, which results in the low-reflectivity material 4 being lower for the signal beam; thus the higher the level in the hopper 1, the larger the area of the hopper inner wall 3 that is blocked by the low reflectivity material 4, the smaller the signal intensity of the reflected beam of the signal beam; according to the characteristics, the material level of the low-reflectivity material 4 in the hopper 1 can be obtained by detecting the signal intensity of the reflected wave beam; in this embodiment, the low reflectivity material 4 is combustible household garbage.
As shown in fig. 1 and 2, in addition to the hopper inner wall 3, objects around the hopper reflect signal beams, and the reflected beams of the objects mostly lead or lag the reflected beams of the hopper inner wall 3 due to different positions; to avoid that these lead or lag reflected signals affect the measurement results, the window filtering module 8 may be used to filter the reflected beam received by the beam signal converting module 7, to filter out lead or lag reflections; the window filter module 8 comprises an on time and an off time, and the reflected beam between the propagation time and the off time can enter the reflected beam intensity measurement module 9 through the window filter module 8.
As shown in fig. 1 and 2, the maximum propagation distance and the minimum distance of the signal beam from the level detection probe 2 to the hopper inner wall 3 can be calculated by the propagation speed of the signal beam, the shape and the size of the hopper inner wall 3 and the installation position of the level detection probe 2, and further the maximum propagation time tmax and the minimum propagation time tmin of the signal beam can be calculated; with twice the maximum propagation time tmax as the off time and the minimum propagation time tmin as the on time, the window filtering module 8 can effectively filter out leading or lagging reflected beams.
As shown in fig. 1 and 2, in order to facilitate the synchronous operation of the window filtering module 8 and the beam transmitting module 5, the beam transmitting module 5 outputs the radio waves transmitted by the beam transmitting module to the window filtering module 8; when the beam transmitting module 5 transmits a signal beam, the window filtering module 8 starts timing; when the timing data is larger than the starting time, the window filtering module 8 forwards the reflected beam received by the beam signal conversion module 7 to the reflected beam intensity measuring module 9; when the timing data is greater than the off time, the window filtering module 8 stops the beam signal converting module 7 from forwarding the received reflected beam to the reflected beam intensity measuring module 9.
As shown in fig. 1 and 2, the present embodiment further relates to a method for using a material level detection system in an incineration hopper, which specifically includes the following steps:
1) Mounting a material level detection probe 2 to the obliquely upper side of the hopper 1; during installation, the level detection probe 2 cannot be located directly above the hopper 1 to prevent the level detection probe 2 from obstructing the grab from throwing the low-reflectivity material 4 into the hopper 1 from above the hopper; in addition, the beam emission direction of the material level detection probe 2 is required to be ensured to be perpendicular to the inner wall 3 of the hopper as much as possible in the installation process.
2) Calibrating the opening time and closing time of the window filtering module 8; in the calibration process, firstly, calculating the maximum propagation distance and the minimum distance of the signal beam from the material level detection probe 2 to the inner wall 3 of the hopper according to the propagation speed of the signal beam, the shape and the size of the inner wall 3 of the hopper and the installation position of the material level detection probe 2; then, calculating the maximum propagation time tmax and the minimum propagation time tmin of the signal beam according to the maximum propagation distance and the minimum distance; with twice the maximum propagation time tmax as the off time and the minimum propagation time tmin as the on time, the window filtering module 8 can effectively filter out leading or lagging reflected beams.
3) Detecting the material level in the hopper 1 by using a material level detecting probe 2 every predetermined time; the detection process specifically comprises the following steps: the beam emitting module 5 of the material level detecting probe 2 emits a signal beam to the inner wall 3 of the hopper, and the signal beam forms a reflected beam after being reflected by the inner wall 3 of the hopper and the low-reflectivity material 4 in the hopper 1; the beam signal conversion module 7 converts the reflected beam into an electric signal and transmits the converted electric signal to the window filtering module 8; the window filtering module 8 filters the electric signals of the reflected wave beams and transmits the filtered electric signals to the reflected wave beam intensity measuring module 9; the reflected beam intensity measurement module 9 measures the intensity of the reflected beam from the filtered electrical signal and determines the filling level in the hopper 1 from the intensity of the reflected beam.
The beneficial technical effects of this embodiment are: unlike household garbage, plant stalks and other low-reflectivity materials, the inner wall of the hopper made of metal has stronger and stable reflectivity for signal beams; the shielding condition of the inner wall of the detection hopper is adopted to detect the material level in the hopper, so that measurement errors caused by weak and unstable reflectivity of the low-reflectivity material can be avoided.
Example 2: as shown in fig. 1 and 3, the main difference between the present embodiment and embodiment 1 is that the signal beam in the present embodiment adopts ultrasonic waves instead of electromagnetic waves; in the specific embodiment, the beam transmitting module 5 is an ultrasonic transmitting module, and the beam signal converting module 7 is an ultrasonic receiver; the structure and calibration method of the window filter module 8 are the same as those of embodiment 1; in this embodiment, the beam emitting module 5 and the window filtering module 8 are both connected with a timing module 10; the timing module 10 sends trigger signals to the beam transmitting module 5 and the window filtering module 8 at intervals of a preset time; the beam transmitting module 5 transmits signal beams to the inner wall 3 of the hopper immediately after receiving the trigger signals; at the same time, window filter module 8 immediately starts timing and filters the reflected beam according to the method of embodiment 1; the reflected beam intensity measurement module 9 operates in the same manner as in embodiment 1.
Claims (1)
1. The use method of the material level detection system in the incineration hopper is characterized in that the material level detection system comprises a hopper and a material level detection probe; the hopper is a funnel-shaped container with a downward tip, and an opening is arranged at the top of the hopper; the inner wall of the hopper is made of metal; the material level detection probe is arranged obliquely above the hopper, and faces to the inner wall of the hopper; the material level detection probe is used for emitting a signal beam to the inner wall of the hopper and determining the material level in the hopper according to the signal intensity of the reflected beam of the inner wall of the hopper;
the beam emission direction sent by the material level detection probe is vertical to the inner wall of the hopper, and the positive and negative deviation of the angle is less than or equal to 30 degrees; the hopper is used for containing low-reflectivity materials;
the material level detection probe comprises a beam transmitting module and a reflected beam receiving module; the reflected beam receiving module comprises a beam signal conversion module, a window filtering module and a reflected beam intensity measuring module which are connected in sequence; the window filtering module is used for filtering the reflected wave beams received too early or too late;
the beam transmitting module is an ultrasonic transmitting module, and the beam signal converting module is an ultrasonic receiver; the beam transmitting module and the window filtering module are synchronized through clock signals;
the using method comprises the following steps: mounting a material level detection probe to the obliquely upper part of the hopper; calibrating the opening time and closing time of the window filtering module; detecting the material level in the hopper at predetermined intervals by using the material level detection probe;
calibrating the opening time and the closing time of the window filtering module comprises the following steps: calculating the maximum propagation time and the minimum propagation time of the signal beam from the material level detection probe to the inner wall of the hopper according to the propagation speed of the signal beam, the shape and the size of the inner wall of the hopper and the distance between the material level detection probe and the inner wall of the hopper; taking twice of the maximum propagation time as the closing time of the window filtering module and taking the minimum propagation time as the opening time of the window filtering module;
the method for detecting the material level in the hopper by using the material level detection probe specifically comprises the following steps: the beam emission module of the material level detection probe emits the signal beam to the inner wall of the hopper, and the signal beam forms the reflected beam after being reflected by the inner wall of the hopper and the low-reflectivity material in the hopper; the beam signal conversion module converts the reflected beam into an electric signal and transmits the electric signal to the window filtering module; the window filtering module filters the electric signals of the reflected wave beams and transmits the filtered electric signals to the reflected wave beam intensity measuring module; the reflected beam intensity measurement module measures the intensity of the reflected beam according to the filtered electrical signal and determines the level of the material in the hopper according to the intensity of the reflected beam.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711418790.5A CN107907185B (en) | 2017-12-25 | 2017-12-25 | Material level detection system in incineration hopper and application method thereof |
| PCT/CN2018/122947 WO2019128889A1 (en) | 2017-12-25 | 2018-12-22 | Level detection system for incineration hopper, and method for using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711418790.5A CN107907185B (en) | 2017-12-25 | 2017-12-25 | Material level detection system in incineration hopper and application method thereof |
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| CN107907185A CN107907185A (en) | 2018-04-13 |
| CN107907185B true CN107907185B (en) | 2024-04-05 |
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| WO (1) | WO2019128889A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107907185B (en) * | 2017-12-25 | 2024-04-05 | 上海昂丰装备科技有限公司 | Material level detection system in incineration hopper and application method thereof |
| CN115421131B (en) * | 2022-11-04 | 2023-01-31 | 北京锐达仪表有限公司 | Equivalent multi-position dead-angle-free electromagnetic wave 3D scanning radar and material measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08178732A (en) * | 1994-12-27 | 1996-07-12 | Nittetsu Mining Co Ltd | Method and apparatus for detecting level using laser light |
| JP2000283443A (en) * | 1999-03-29 | 2000-10-13 | Mitsubishi Heavy Ind Ltd | Device and method for measuring refuse layer in refuse incinerator |
| CN102322920A (en) * | 2011-08-24 | 2012-01-18 | 四川大学 | Method for measuring existence of powdery materials in specific material position of container and implementation material level switch thereof |
| CN103376145A (en) * | 2012-04-24 | 2013-10-30 | 克洛纳测量技术有限公司 | Method for determining the fill level of a medium and corresponding apparatus |
| CN105403286A (en) * | 2015-12-21 | 2016-03-16 | 上海云鱼智能科技有限公司 | Electromagnetic wave node level indicator |
| CN208043191U (en) * | 2017-12-25 | 2018-11-02 | 上海昂丰装备科技有限公司 | A kind of material-level detection system in burning hopper |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4470299A (en) * | 1982-01-04 | 1984-09-11 | Fischer & Porter Company | Ultrasonic liquid level meter |
| CN201463986U (en) * | 2009-05-26 | 2010-05-12 | 唐山建龙实业有限公司 | Improved ultrasonic material level measuring device |
| CN206365487U (en) * | 2016-12-14 | 2017-08-01 | 宁波中瑞生物科技有限公司 | A kind of soybean extruding-puffing machine |
| CN107907185B (en) * | 2017-12-25 | 2024-04-05 | 上海昂丰装备科技有限公司 | Material level detection system in incineration hopper and application method thereof |
-
2017
- 2017-12-25 CN CN201711418790.5A patent/CN107907185B/en active Active
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2018
- 2018-12-22 WO PCT/CN2018/122947 patent/WO2019128889A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08178732A (en) * | 1994-12-27 | 1996-07-12 | Nittetsu Mining Co Ltd | Method and apparatus for detecting level using laser light |
| JP2000283443A (en) * | 1999-03-29 | 2000-10-13 | Mitsubishi Heavy Ind Ltd | Device and method for measuring refuse layer in refuse incinerator |
| CN102322920A (en) * | 2011-08-24 | 2012-01-18 | 四川大学 | Method for measuring existence of powdery materials in specific material position of container and implementation material level switch thereof |
| CN103376145A (en) * | 2012-04-24 | 2013-10-30 | 克洛纳测量技术有限公司 | Method for determining the fill level of a medium and corresponding apparatus |
| CN105403286A (en) * | 2015-12-21 | 2016-03-16 | 上海云鱼智能科技有限公司 | Electromagnetic wave node level indicator |
| CN208043191U (en) * | 2017-12-25 | 2018-11-02 | 上海昂丰装备科技有限公司 | A kind of material-level detection system in burning hopper |
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| CN107907185A (en) | 2018-04-13 |
| WO2019128889A1 (en) | 2019-07-04 |
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