CN110482166B - Automatic garbage feeding control system - Google Patents
Automatic garbage feeding control system Download PDFInfo
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- CN110482166B CN110482166B CN201910753350.8A CN201910753350A CN110482166B CN 110482166 B CN110482166 B CN 110482166B CN 201910753350 A CN201910753350 A CN 201910753350A CN 110482166 B CN110482166 B CN 110482166B
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- material level
- feeding
- level switch
- radio frequency
- ultrasonic sensor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
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Abstract
An automatic garbage feeding control system comprises a first radio frequency admittance material level switch, wherein the first radio frequency admittance material level switch is provided with a low material level switch and a high material level switch, and the low material level switch and the high material level switch are arranged on a material well wall of a feeding port of a roller from bottom to top; a flange sleeve is arranged at the mounting position of the first radio frequency admittance material level switch, and the first radio frequency admittance material level meter is fixed on the flange sleeve and can be movably adjusted; the second radio frequency admittance material level switch is arranged on a material well wall at a discharge port of the roller, stops feeding at the upper stage and the lower stage under the condition of high material level and gives an alarm for the lower stage material level; the ultrasonic sensor is divided into a first ultrasonic sensor and a second ultrasonic sensor; the invention realizes the automatic stable feeding function of the boiler feeding system, can realize material level detection, material cut-off alarm, material level height limit alarm of a feeding port, automatic material supplement, automatic feeding adjustment, automatic material cut-off in abnormal state and the like, lightens the work burden and pressure of operators, and can also make the combustion condition of the boiler more stable.
Description
Technical Field
The invention relates to a garbage feeding control system, in particular to an automatic garbage feeding control system.
Background
The feeding of the circulating fluidized bed boiler adopts a screw feeder to enter the roller through the material well, and then the roller rotates to feed the material into the boiler combustion chamber for combustion in a throwing mode. The feed is in a sealed, negative pressure state. The existing feeding system adopts a video visual technology for monitoring, and an operator manually carries out feeding condition intervention treatment according to a video picture. The existing problems are as follows:
1) the video picture is easily blurred due to the influence of on-site negative pressure, dust and materials, and the judgment of an operator on the on-site condition is influenced.
2) The video images have no accurate reference object, and the feeding quantity cannot be accurately judged, so that the feeding judgment is influenced.
3) The feeding mode is too high for the manual dependence degree and needs manual experience prejudgment, which is not favorable for the requirement of stable operation of production.
4) The original garbage treatment process is improved, the garbage components and the granularity are uniform, and the water content is reduced. The garbage heat value variation range is small, and the boiler combustion condition is relatively stable.
Disclosure of Invention
The invention aims to provide an automatic garbage feeding control system, aiming at the problems, the automatic stable feeding function of a boiler feeding system is realized through the automatic garbage feeding control system, and the functions comprise: the material level detects, and the warning is expected absolutely to the material, and the warning of feed inlet material level height limit, automatic feed supplement, automatic feed regulation, the automatic disconnected material of abnormal state etc. alleviate operating personnel's work burden and pressure, also can make boiler combustion condition more stable. To address at least one aspect of the above-described problems.
According to one aspect of the invention, an automatic garbage feeding system comprises a first radio frequency admittance material level switch, wherein the first radio frequency admittance material level switch is provided with a low material level switch and a high material level switch, and the low material level switch and the high material level switch are arranged on a material well wall of a feeding port of a roller from bottom to top; a flange sleeve is arranged at the mounting position of the first radio frequency admittance material level switch, the flange sleeve and the well wall form an angle of 45 degrees, and the first radio frequency admittance material level switch is fixed on the flange sleeve and can be movably adjusted; the switching value detection point is output when the garbage contacts the first radio frequency admittance material level switch, so that the judgment of the material level high-low limit state of the feeding port is realized;
the at least one second radio frequency admittance material level switch is arranged on a material well wall at a discharge port of the roller, detects the feeding position of the garbage, stops feeding at the upper level and the lower level under the condition of high material level and sends out an alarm of the lower level;
the compressed air back blowing device is additionally arranged at the ultrasonic sensor, and the ultrasonic sensor is divided into a first ultrasonic sensor and a second ultrasonic sensor;
the first ultrasonic sensor is arranged on a material well wall of the roller feeding hole, detects the material height of the material well of the roller feeding hole in real time and transmits the material height to the control system; the second ultrasonic sensor is arranged on a material well wall of a material inlet of the roller and is positioned at the opposite position of the feeding spiral reamer, and the material conveying condition of the feeding spiral reamer at a higher level is detected in real time and is remotely transmitted to the control system; the upper feeding is prevented from being empty and blocked;
the first radio frequency admittance material level switch, the second radio frequency admittance material level switch and the ultrasonic sensor are connected with the control system.
Preferably, the compressed air back-blowing device comprises a blowing air nozzle and an air pipe, one end of the air pipe is connected with the blowing air nozzle, the air pipe is fixed at the ultrasonic sensor through a supporting rod, and the blowing air nozzle is aligned to the ultrasonic sensor; the other end of the air pipe is connected with a compressed air system of the circulating fluidized bed boiler.
Preferably, the flange sleeve includes metal flange, regulation hasp, and the regulation hasp passes through the screw to be fixed metal flange on the cylinder feed inlet material wall of a well, the regulation position and the contact of first radio frequency admittance material level switch of regulation hasp, the inclination of adjustable first radio frequency admittance material level switch.
Preferably, the low material level switch detects the feeding position of the garbage, accelerates the feeding speed under the condition of low material level, and delays to start the material-breaking alarm; the high material level switch detects the feeding position of the garbage, stops feeding at the upper level under the condition of high material level and sends out a high material level alarm.
The invention has the beneficial effects that: the invention realizes the automatic stable feeding function of the boiler feeding system, can realize material level detection, material cut-off alarm, material level height limit alarm of a feeding port, automatic material supplement, automatic feeding adjustment, automatic material cut-off in abnormal state and the like, lightens the work burden and pressure of operators, and can also make the combustion condition of the boiler more stable.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the present drum;
FIG. 3 is a schematic structural view of a flange sleeve;
fig. 4 is a schematic structural diagram of a compressed air back-purging device.
Wherein, 101-high material level switch; 102-low level switch; 103-a roller; 104-metal flange; 105-adjusting the lock catch; 201-a first ultrasonic sensor; 202-a second ultrasonic sensor; 203-roller feed inlet; 204-strut; 205-purging the gas injection ports; 206-trachea; 301/302-second radio frequency admittance level switch.
Detailed Description
The invention is further illustrated by the following description and examples in conjunction with the accompanying drawings.
In fig. 1-4, an automatic waste feeding system includes a first rf admittance level switch, at least one second rf admittance level switch, and an ultrasonic sensor.
The first radio frequency admittance material level switch is provided with a low material level switch and a high material level switch, and the low material level switch and the high material level switch are arranged on a material well wall of a feeding port of the roller from bottom to top (the specific position for installing the high-low limit detection of the material level switch is provided by a boiler operator according to the actual material level condition of production); a flange sleeve is arranged at the mounting position of the first radio frequency admittance material level switch, the flange sleeve and the well wall form an angle of 45 degrees, and the first radio frequency admittance material level switch is fixed on the flange sleeve and can be movably adjusted (can be adjusted according to specific conditions); the cable connection connects the normally open contact of the radio frequency admittance material level meter, and the switching value detection point is output when garbage contacts the radio frequency admittance material level switch through the data setting of the meter, so that the judgment of the high-low limit state of the material level of the feeding port is realized.
The second radio frequency admittance material level switch is installed on the cylinder discharge gate material wall of a well (the material level switch installation detects that specific position is provided by boiler operating personnel according to the actual material level condition of production), detects rubbish feed position to stop the upper and lower grade feed and send out the high material level of lower grade and report to the police under the high material level condition.
A compressed air back blowing device is additionally arranged at the ultrasonic sensor, and the ultrasonic sensor is divided into a first ultrasonic sensor and a second ultrasonic sensor; the first ultrasonic sensor is arranged on a material well wall of the roller feeding hole (the installation position is provided by a craftsman according to the actual material level condition in production), and the material height of the material well of the roller feeding hole is detected in real time and is transmitted to the control system; the second ultrasonic sensor is arranged on a material well wall of a feeding port of the roller and is positioned at the opposite position of the feeding spiral reamer (the high-low limit detection position of the material level switch is provided by a boiler operator according to the actual production material level condition), and the material conveying condition of the feeding spiral reamer at the upper stage is detected in real time and is transmitted to the control system; prevent the upper feeding from emptying and blocking.
In some embodiments, due to the material diffusion and the positive pressure of the boiler, a compressed air device is additionally arranged at the ultrasonic sensor for back purging according to set conditions, the compressed air back purging device comprises a purging air nozzle and an air pipe, one end of the air pipe is connected with the purging air nozzle, the air pipe is fixed at the ultrasonic sensor through a support rod, and the purging air nozzle is aligned to the ultrasonic sensor; the other end of the air pipe is connected with a compressed air system of the circulating fluidized bed boiler.
Equipment list
The working process is as follows:
the control of an upper feeding reamer and a lower feeding reamer, the current of a lower roller, the negative pressure of a hearth, the temperature of the hearth, the large linkage of a boiler, MFT and the oxygen content (later stage) of a tail flue of the boiler.
During normal operation of the boiler (temperature of a hearth), fuel after a series of pretreatment enters a feeding shaft wall of the roller under the pushing of the upper feeding reamer and slides down to enter the lower feeding roller. Evenly distributed under the throwing and throwing action of the roller and finally enters a hearth for combustion.
Under the normal and stable condition of bed temperature, the rollers continuously feed and convey the materials to the hearth to ensure stable and continuous combustion. The first ultrasonic sensor is used for continuously detecting whether the material level of the feeding shaft wall of the roller is in a set range, comparing a set value and changing the feeding speed of a higher-level feeding reamer according to a proportional signal. And the second ultrasonic sensor detects whether the upper-level feeding reamer fuel is empty or blocked or not, and the feeding reamer fuel is put into a roll. Two sensors install automatic compressed air jetting under the settlement condition additional, prevent that the measurement is inaccurate and high temperature flue gas is anti-cluster to appear hanging the material.
At the cylinder feeding wall of a well, two first radio frequency admittance material level switches that set up, material level switch detect the material level height, and high material level is reported to the police and is stopped higher level feed system feeding, and empty material is reminded in the warning of low material level signal. In the material level height judgment, compared with an ultrasonic sensor, the radio frequency admittance material level switch signal measured by the material level height is more stable and reliable.
The material gets into the quick-witted feed cylinder of unloading, judges the material level condition in the bucket through the motor current, changes higher level's feed speed. And meanwhile, a second radio frequency admittance material level switch is arranged at the outlet of the feeding roller of the blanking machine, and whether the outlet is blocked or not is detected.
The system is controlled by negative pressure of the hearth, the boiler is linked greatly and MFT is controlled.
Effect test verification
1) The material-breaking alarming function is as follows: through stopping spiral feed feeding, the artifical disconnected material condition that causes verifies whether disconnected material alarming function reports to the police and exports, under the normal feeding condition, verifies whether disconnected material reports to the police and judges.
2) The material level of the feeding hole is limited by the height and has the alarm function: verifying whether the alarm function is in alarm output or not under the condition of the material level high and low limits according to the material accumulation condition of a material inlet of the roller; and under the condition of normal material level, verifying whether the alarm judgment is carried out or not by the material level alarm.
3) The automatic material supplementing function: the automatic material supplementing function is verified through the low-limit state of the material level at the feeding port. (automatic adjustment of the operating speed of the screw feeder for feeding)
4) Automatic feeding regulatory function: the feeding amount of the roller is automatically adjusted through the combustion temperature of the hearth so as to control the effect curve verification. (PID closed-loop automatic regulation, under automatic control, stable hearth temperature and stable temperature trend)
5) The automatic material cutting function in abnormal state: and simulating the abnormal state of the boiler, stopping the feeding roller and the screw feeder, exiting the automatic feeding state of the boiler and giving an alarm for prompting.
An apparatus device:
radio frequency admittance material level switch
Ambient temperature: -40 ℃ -70 ℃ mass temperature: -220- +800 ℃ C
According to the radio frequency admittance material level switch principle, a wire is led out from a measuring signal of a circuit unit, amplified by a non-inverting amplifier, and the output of the wire is connected with a coaxial cable shielding layer and then connected to the shielding layer of a probe. The amplifier is a non-inverting amplifier with gain of "1", and the output signal is at the same potential, phase and frequency as the input signal, but isolated from each other. The ground line is the outermost shield in the cable. Due to the above relationship between the center line of the coaxial cable and the middle shield, no potential difference exists between the two, that is, no current flows through the center line, which is equivalent to no or zero capacitance between the two. Therefore, the temperature effect of the cable, the installation capacitance and the like can not be influenced. For the problem of hanging materials on the probe, a novel probe structure is adopted, and the probe structure is a five-layer concentric structure, wherein the innermost layer is a central measuring rod, the middle part is a central shielding layer, the outermost part is a grounded mounting thread, and the innermost layer and the outermost layer are respectively isolated by insulating layers.
A capacitor is formed between the electrode inserted into the bin and the wall of the bin, and when the capacitance is changed due to the change of the material level of the material in the bin, a corresponding control signal is obtained through a conversion circuit. Because the capacitance is continuously variable, the level gauge can be used as a continuous level measurement and also as a level switch as an alarm or an input signal for feeding and discharging equipment. The material level meter has the characteristics of low manufacturing cost, no mechanical abrasion, convenience in installation and maintenance and the like.
1. The device has strong universality, is suitable for various occasions, and can detect particles, fly ash, conductive liquid, non-conductive liquid and viscous materials;
2. the anti-adhesion circuit is an advanced anti-adhesion circuit design, and can eliminate the adhesion of materials to generate false error signals;
3. and a power-loss protection mode, namely low-order or high-order fault alarm. And (4) field adjustment.
4. Easy to install and adjust
5. Material sticking and hanging resistance
6. Good stability and no influence of temperature
7. Adjustable delay output
8. The temperature resistance can be up to 550 DEG C
9. High and low position failure protection function
Ultrasonic sensor
An ultrasonic sensor is a sensor that converts an ultrasonic signal into another energy signal (typically an electrical signal). It has the features of high frequency, short wavelength, less diffraction, high directivity, directional propagation, etc. The penetration of ultrasonic waves into liquids and solids is great, especially in sunlight-opaque solids. Ultrasonic waves hitting impurities or interfaces can generate significant reflection to form echoes, and the Doppler effect can be generated when the ultrasonic waves hit a moving object. The ultrasonic sensor is widely applied to the aspects of industry, national defense, biomedicine and the like.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (4)
1. An automatic rubbish feeding control system which is characterized in that: the device comprises a first radio frequency admittance material level switch, wherein the first radio frequency admittance material level switch is provided with a low material level switch and a high material level switch, and the low material level switch and the high material level switch are arranged on a material well wall of a feeding hole of a roller from bottom to top; a flange sleeve is arranged at the mounting position of the first radio frequency admittance material level switch, the flange sleeve and the wall of the material well form an inclined angle of 45 degrees, and the first radio frequency admittance material level switch is fixed on the flange sleeve and can be movably adjusted; the switching value detection point is output when the garbage contacts the first radio frequency admittance material level switch, so that the judgment of the material level high-low limit state of the feeding port is realized;
the at least one second radio frequency admittance material level switch is arranged on a material well wall at a discharge port of the roller, detects the feeding position of the garbage, stops feeding at the upper level and the lower level under the condition of high material level and sends out an alarm of the lower level;
the compressed air back blowing device is additionally arranged at the ultrasonic sensor, and the ultrasonic sensor is divided into a first ultrasonic sensor and a second ultrasonic sensor;
the first ultrasonic sensor is arranged on a material well wall of the roller feeding hole, detects the material height of the material well of the roller feeding hole in real time and transmits the material height to the control system; the second ultrasonic sensor is arranged on a material well wall of a material inlet of the roller and is positioned at the opposite position of the feeding spiral reamer, so that the material conveying condition of the feeding spiral reamer at the upper stage is detected in real time and is transmitted to the control system; the upper feeding is prevented from being empty and blocked;
the first radio frequency admittance material level switch, the second radio frequency admittance material level switch and the ultrasonic sensor are connected with the control system.
2. The automatic refuse feed control system according to claim 1, characterized in that: the compressed air reverse blowing device comprises a blowing air nozzle and an air pipe with one end connected with the blowing air nozzle, the air pipe is fixed at the ultrasonic sensor through a support rod, and the blowing air nozzle is aligned to the ultrasonic sensor; the other end of the air pipe is connected with a compressed air system of the circulating fluidized bed boiler.
3. The automatic refuse feed control system according to claim 1, characterized in that: the flange sleeve pipe includes metal flange, regulation hasp, and the regulation hasp passes through the screw to be fixed metal flange on the cylinder feed inlet material wall of a well, the regulation position and the contact of first radio frequency admittance material level switch of regulation hasp can adjust the inclination of first radio frequency admittance material level switch.
4. The automatic refuse feed control system according to claim 1, characterized in that: the low material level switch detects the feeding position of the garbage, accelerates the feeding speed under the condition of low material level and delays to start the material-breaking alarm; the high material level switch detects the feeding position of the garbage, and stops feeding at the upper level and sends out a high material level alarm under the condition of high material level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910753350.8A CN110482166B (en) | 2019-08-15 | 2019-08-15 | Automatic garbage feeding control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910753350.8A CN110482166B (en) | 2019-08-15 | 2019-08-15 | Automatic garbage feeding control system |
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| CN110482166A CN110482166A (en) | 2019-11-22 |
| CN110482166B true CN110482166B (en) | 2020-12-29 |
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| CN113252771A (en) * | 2021-06-03 | 2021-08-13 | 中冶北方（大连）工程技术有限公司 | Online detection device and method for FeO content of sinter with inclined sleeve structure |
| CN114593593A (en) * | 2022-03-21 | 2022-06-07 | 河南郑矿机器有限公司 | Feeding sealing and anti-blocking device and method for rotary equipment |
| CN116379607B (en) * | 2023-06-05 | 2023-08-18 | 达州玖源新材料有限公司 | Heating equipment and drive control system for raw material processing production |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2185729B1 (en) * | 1972-05-23 | 1974-12-27 | Vidal Lucien | |
| JPS57184820A (en) * | 1981-05-07 | 1982-11-13 | Kubota Ltd | Method of taking out fusion from waste melting furnace |
| CN1088817C (en) * | 1994-12-27 | 2002-08-07 | 北京蓝天新源科技有限公司 | Technology and equipment for boiler coal gas pre-generation |
| CN202511288U (en) * | 2012-02-23 | 2012-10-31 | 成都融科能源环境工程有限公司 | Novel forehearth feeding combination system of garbage incinerator of circulating fluidized bed |
| CN103625941A (en) * | 2013-11-14 | 2014-03-12 | 攀钢集团研究院有限公司 | Powdery material feeding system and method |
| CN204057293U (en) * | 2014-08-28 | 2014-12-31 | 安徽燕庄油脂有限责任公司 | Stove drawing-in device fried by the sesame that stove fried by a kind of sesame |
| CN204115814U (en) * | 2014-08-29 | 2015-01-21 | 河南中烟工业有限责任公司 | A kind of gauge line height material level adopts the control system of double check |
| CN107021361B (en) * | 2017-03-17 | 2019-11-08 | 合肥固泰自动化有限公司 | A kind of double hose given quantity feeding device |
| CN208124311U (en) * | 2018-04-16 | 2018-11-20 | 武汉市绿色环保能源有限公司 | Waste incinerator stokehold batcher monitoring device |
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