CN113086553A - Coal amount calculating and controlling system for coal feeder of thermal power plant - Google Patents
Coal amount calculating and controlling system for coal feeder of thermal power plant Download PDFInfo
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- CN113086553A CN113086553A CN202110196262.XA CN202110196262A CN113086553A CN 113086553 A CN113086553 A CN 113086553A CN 202110196262 A CN202110196262 A CN 202110196262A CN 113086553 A CN113086553 A CN 113086553A
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- coal
- feeder
- coal feeder
- programmable logic
- logic controller
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- 239000003245 coal Substances 0.000 title claims abstract description 127
- 238000005303 weighing Methods 0.000 claims abstract description 13
- 238000004364 calculation method Methods 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 5
- 230000009977 dual effect Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000032683 aging Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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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
- B65G43/08—Control devices operated by article or material being fed, conveyed or discharged
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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
- B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
- B65G2203/02—Control or detection
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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
- B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
- B65G2203/02—Control or detection
- B65G2203/0208—Control or detection relating to the transported articles
- B65G2203/0258—Weight of the article
-
- 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
- B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
- B65G2203/04—Detection means
- B65G2203/042—Sensors
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Abstract
The invention relates to a coal quantity calculating and controlling system of a coal feeder of a thermal power plant, which comprises a programmable logic controller, wherein the programmable logic controller is connected with a DCS (distributed control system) through a data transmission module; the programmable logic controller is used for acquiring millivolt signals of the weighing sensor and pulse signals of the rotating speed of the coal feeder, and obtaining the coal yield through calculation; the DCS is used for acquiring coal output data for operators to monitor the coal quantity, and when the coal quantity of the coal feeder is controlled manually, the DCS directly controls the output of a frequency converter of the coal feeder, and at the moment, the coal quantity is controlled in an open loop mode; when the coal feeder is put into automation, the programmable logic controller compares the calculated coal quantity with a coal quantity given value, and controls the output of a coal feeder frequency converter through PID output. The invention can solve the problem of tripping of the coal feeder caused by aging of the on-site coal feeder, the operation of the coal feeder is more stable, the coal quantity of the coal feeder is more convenient to calibrate, the cost is lower, and the daily maintenance is free.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a coal quantity calculating and controlling system of a coal feeder of a thermal power plant.
Background
The existing coal quantity calculation and control are integrated in the control of an on-site calculating instrument, and because electronic components of the calculating instrument are seriously aged and the environment of the on-site furnace side is poor, the calculating instrument frequently breaks down, so that a coal feeder is tripped, and the safe and stable operation of a unit is seriously influenced.
Disclosure of Invention
The invention aims to provide a coal quantity calculating and controlling system of a coal feeder in a thermal power plant, which aims to solve the problem of tripping of the coal feeder caused by aging of a field coal feeder, so that the coal feeder is more stable to operate, the coal quantity of the coal feeder is more conveniently calibrated, the cost is reduced, and the daily maintenance is omitted.
The invention provides a coal quantity calculating and controlling system of a coal feeder of a thermal power plant, which comprises a programmable logic controller, wherein the programmable logic controller is connected with a DCS (distributed control system) through a data transmission module;
the programmable logic controller is used for acquiring millivolt signals of the weighing sensor and pulse signals of the rotating speed of the coal feeder, and obtaining the coal yield through calculation;
the DCS is used for acquiring coal output data for operators to monitor the coal quantity, and when the coal quantity of the coal feeder is controlled manually, the DCS directly controls the output of a frequency converter of the coal feeder, and at the moment, the coal quantity is controlled in an open loop mode; when the coal feeder is put into automation, the programmable logic controller compares the calculated coal quantity with a coal quantity given value, and controls the output of a coal feeder frequency converter through PID output.
Further, the data transmission module is an AO card.
Furthermore, the millivolt signal of the weighing sensor is shielded from interference by adopting a double-shielded cable single-end grounding method.
Furthermore, the programmable logic controller adopts a double-power switching device for power supply so as to ensure power supply redundancy.
Further, the programmable logic controller calculates the coal amount by the following method:
1) the programmable logic controller receives millivolt signals of the weighing sensor, and the received millivolt signals are converted into variables required by coal quantity calculation by adopting a temperature TC clamping piece; the millivolt signal of the weighing sensor participates in calibration, and the zero point and the full scale of the millivolt signal are calibrated;
2) the coal feeder adopts a pulse input mode on site, adopts a PLC pulse clamping piece, receives a rotating speed signal of the coal feeder, converts the rotating speed signal into a variable required by the coal quantity, increases the rotating speed signal for bad quality judgment, and keeps outputting the current value when the rotating speed exceeds a set interval;
3) and (3) performing logic operation of an algorithm block on the two variables in the step 1) and the step 2) in the programmable logic controller, and calculating the coal yield.
By means of the scheme, the problem that the coal feeder trips due to the fact that the field coal feeder is aged can be solved through the coal amount calculating and controlling system of the coal feeder of the thermal power plant, the coal feeder operates more stably, the coal amount of the coal feeder is calibrated more conveniently, the cost is lower, and daily maintenance is free.
Drawings
FIG. 1 is a flow chart of calculation and control of a coal amount calculation and control system of a coal feeder of a thermal power plant.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, the embodiment provides a coal quantity calculating and controlling system for a coal feeder of a thermal power plant, which includes a Programmable Logic Controller (PLC), where the PLC is connected to a DCS system through a data transmission module;
the programmable logic controller is used for acquiring millivolt signals of the weighing sensor and pulse signals of the rotating speed of the coal feeder, and obtaining the coal yield through calculation;
the DCS is used for acquiring coal output data for operators to monitor the coal quantity, and when the coal quantity of the coal feeder is controlled manually, the DCS directly controls the output of a frequency converter of the coal feeder, and at the moment, the coal quantity is controlled in an open loop mode; when the coal feeder is put into automation, the programmable logic controller compares the calculated coal quantity with a coal quantity given value, and controls the output of a coal feeder frequency converter through PID output.
According to the coal quantity calculating and controlling system of the coal feeder of the thermal power plant, a Programmable Logic Controller (PLC) is used for replacing a coal feeder calculating instrument to complete coal quantity calculation and control, when the coal quantity control is manual, the coal quantity value is only a display value, even if the PLC is powered off and the coal quantity value is a bad value, the coal feeder normally operates, and the coal feeder cannot trip due to PLC faults to influence unit load control. The signal transmission is stable, and the PLC operation is stable. And regularly inspecting the PLC load rate. The coal quantity of the coal feeder is more convenient to calibrate. The cost is low. The daily maintenance is exempted from.
In this embodiment, the data transmission module is an AO card.
In this embodiment, the millivolt signal is greatly interfered by the outside, so that the signal variation is large, and the millivolt signal of the weighing sensor is shielded by adopting a double-shielded cable single-end grounding method.
In this embodiment, the programmable logic controller uses a dual power switching device to supply power, so as to ensure power supply redundancy.
In this embodiment, the programmable logic controller calculates the coal amount by the following method:
1) the programmable logic controller receives millivolt signals of the weighing sensor, and the received millivolt signals are converted into variables required by coal quantity calculation by adopting a temperature TC clamping piece; the millivolt signal of the weighing sensor participates in calibration, and the zero point and the full scale of the millivolt signal are calibrated;
2) the coal feeder adopts a pulse input mode on site, adopts a PLC pulse clamping piece, receives a rotating speed signal of the coal feeder, converts the rotating speed signal into a variable required by the coal quantity, increases the rotating speed signal for bad quality judgment, and keeps outputting the current value when the rotating speed exceeds a set interval;
3) and (3) performing logic operation of an algorithm block on the two variables in the step 1) and the step 2) in the programmable logic controller, and calculating the coal yield.
Coal volume numerical value gives DCS through PLC's AO fastener teletransmission, makes things convenient for the operating personnel to keep watch on the coal volume, when the control of feeder coal volume is manual, DCS directly controls feeder converter output with AO fastener, is open loop control this moment, and when the feeder drops into automatically, PLC calculates coal volume pv and coal volume setting value sp and compares, and then control feeder converter output through PID output.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A coal quantity calculating and controlling system of a coal feeder of a thermal power plant is characterized by comprising a programmable logic controller, wherein the programmable logic controller is connected with a DCS (distributed control system) through a data transmission module;
the programmable logic controller is used for acquiring millivolt signals of the weighing sensor and pulse signals of the rotating speed of the coal feeder, and obtaining the coal yield through calculation;
the DCS is used for acquiring coal output data for operators to monitor the coal quantity, and when the coal quantity of the coal feeder is controlled manually, the DCS directly controls the output of a frequency converter of the coal feeder, and at the moment, the coal quantity is controlled in an open loop mode; when the coal feeder is put into automation, the programmable logic controller compares the calculated coal quantity with a coal quantity given value, and controls the output of a coal feeder frequency converter through PID output.
2. The coal quantity calculating and controlling system for the coal feeder of the thermal power plant as recited in claim 1, wherein the data transmission module is an AO card.
3. The coal quantity calculating and controlling system for the coal feeder of the thermal power plant as recited in claim 1, wherein the millivolt signal of the weighing sensor is shielded from interference by a double-shielded cable single-end grounding method.
4. The coal quantity calculating and controlling system for the coal feeder of the thermal power plant as recited in claim 1, wherein the programmable logic controller supplies power by using a dual power supply switching device to ensure power supply redundancy.
5. The system for calculating and controlling the amount of coal supplied to the coal feeder of the thermal power plant as claimed in claim 2, wherein the programmable logic controller calculates the amount of coal by:
1) the programmable logic controller receives millivolt signals of the weighing sensor, and the received millivolt signals are converted into variables required by coal quantity calculation by adopting a temperature TC clamping piece; the millivolt signal of the weighing sensor participates in calibration, and the zero point and the full scale of the millivolt signal are calibrated;
2) the coal feeder adopts a pulse input mode on site, adopts a PLC pulse clamping piece, receives a rotating speed signal of the coal feeder, converts the rotating speed signal into a variable required by the coal quantity, increases the rotating speed signal for bad quality judgment, and keeps outputting the current value when the rotating speed exceeds a set interval;
3) and (3) performing logic operation of an algorithm block on the two variables in the step 1) and the step 2) in the programmable logic controller, and calculating the coal yield.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110196262.XA CN113086553A (en) | 2021-02-22 | 2021-02-22 | Coal amount calculating and controlling system for coal feeder of thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110196262.XA CN113086553A (en) | 2021-02-22 | 2021-02-22 | Coal amount calculating and controlling system for coal feeder of thermal power plant |
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| CN113086553A true CN113086553A (en) | 2021-07-09 |
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| CN202110196262.XA Pending CN113086553A (en) | 2021-02-22 | 2021-02-22 | Coal amount calculating and controlling system for coal feeder of thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115009801A (en) * | 2022-06-14 | 2022-09-06 | 江苏大唐国际吕四港发电有限责任公司 | Double-rotation-speed measuring method for coal feeder |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202453059U (en) * | 2012-03-03 | 2012-09-26 | 国投曲靖发电有限公司 | Acquisition and data processing system for coal feed quantity of coal feeder |
| CN103941606A (en) * | 2014-04-17 | 2014-07-23 | 大唐贵州发耳发电有限公司 | Thermal power plant weighing coal feeder control logic |
| CN206068970U (en) * | 2016-09-23 | 2017-04-05 | 浙江硕成自动化设备有限公司 | Coal feeder control system based on PLC |
| CN207851591U (en) * | 2018-02-26 | 2018-09-11 | 沈阳奎昊电力机械制造有限公司 | A kind of metering of feeder and control monitoring device |
| CN212197367U (en) * | 2020-02-25 | 2020-12-22 | 淮北矿业股份有限公司 | Washing and selecting control system for coal feeder |
-
2021
- 2021-02-22 CN CN202110196262.XA patent/CN113086553A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202453059U (en) * | 2012-03-03 | 2012-09-26 | 国投曲靖发电有限公司 | Acquisition and data processing system for coal feed quantity of coal feeder |
| CN103941606A (en) * | 2014-04-17 | 2014-07-23 | 大唐贵州发耳发电有限公司 | Thermal power plant weighing coal feeder control logic |
| CN206068970U (en) * | 2016-09-23 | 2017-04-05 | 浙江硕成自动化设备有限公司 | Coal feeder control system based on PLC |
| CN207851591U (en) * | 2018-02-26 | 2018-09-11 | 沈阳奎昊电力机械制造有限公司 | A kind of metering of feeder and control monitoring device |
| CN212197367U (en) * | 2020-02-25 | 2020-12-22 | 淮北矿业股份有限公司 | Washing and selecting control system for coal feeder |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115009801A (en) * | 2022-06-14 | 2022-09-06 | 江苏大唐国际吕四港发电有限责任公司 | Double-rotation-speed measuring method for coal feeder |
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Application publication date: 20210709 |