CN106994386B - Coal blocking early warning and automatic processing device and method for medium-speed coal mill - Google Patents
Coal blocking early warning and automatic processing device and method for medium-speed coal mill Download PDFInfo
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- CN106994386B CN106994386B CN201710318584.0A CN201710318584A CN106994386B CN 106994386 B CN106994386 B CN 106994386B CN 201710318584 A CN201710318584 A CN 201710318584A CN 106994386 B CN106994386 B CN 106994386B
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- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
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- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
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Abstract
The invention discloses a device and a method for early warning and automatically processing coal blockage of a medium-speed coal mill, wherein the device comprises a first pressure sensor and a flow sensor which are respectively arranged on an inlet pipeline of the coal mill; and a second pressure sensor disposed on the coal pulverizer outlet conduit; the first pressure sensor and the flow sensor are respectively used for collecting the pressure and the flow of the inlet of the coal mill and transmitting the pressure and the flow to the controller; the second pressure sensor is used for collecting the pressure of the outlet of the coal mill and transmitting the pressure to the controller; the controller is connected with the early warning device; the controller is used for comparing the flow and the pressure difference of the inlet and outlet of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device if at least one signal is not in the corresponding normal threshold range; and the controller is also used for regulating the hot air regulating valve to enter the air quantity of the coal mill or regulating the cold air regulating valve to reduce the temperature of an outlet of the coal mill.
Description
Technical Field
The invention belongs to the field of coal mills, and particularly relates to a device and a method for early warning and automatically treating coal blockage of a medium-speed coal mill.
Background
The coal mill is an important auxiliary equipment of the utility boiler, and the medium-speed coal mill is widely applied due to the advantages of quick start, low power consumption for pulverizing and the like. However, under the condition of poor coal types, particularly high moisture and ash content of raw coal, if the operation is improper, the coal mill is easy to be blocked, so that early warning and timely treatment of the coal mill blocking are very important, otherwise, the safe and stable operation of the unit can be seriously affected. And if the coal is manually cleaned after the coal is blocked, the flying coal dust not only causes pollution to the environment, but also causes unexpected accident expansion, such as incomplete system isolation, and the hot air for grinding enters a coal mill for maintenance, so that maintenance personnel can be burned, and even coal dust deflagration is caused.
However, currently used coal mill plugging signals rely solely on the mill inlet-outlet differential pressure signal to alert the operator. The method has the defect that: firstly, a single pressure measuring point is easy to block, and if any dead point at an inlet or an outlet cannot send an alarm signal; secondly, the influence of the air quantity and the output of the coal mill is large, and operators can only judge whether coal is blocked according to respective experience, so that misjudgment and missed judgment are often caused; thirdly, alarming is delayed; fourthly, even if coal blockage is found, the coal blockage can only be manually operated and processed, and the coal blockage cannot be automatically processed.
Disclosure of Invention
In order to solve the defects of the prior art, the first aim of the invention is to provide a coal blockage early warning and automatic processing device for a medium-speed coal mill, which not only can early warn coal blockage in advance, but also can realize automatic processing of abnormal coal blockage, prevent expansion of accidents and effectively promote safe and stable operation of the coal mill and a unit.
The invention provides three kinds of coal blocking early warning and automatic processing devices of a medium-speed coal mill.
The first coal blocking early warning and automatic processing device of the medium speed coal mill is characterized in that cold air in a cold air pipeline is mixed with hot air in a hot air pipeline and then is introduced into the medium speed coal mill; the cold air pipeline and the hot air pipeline are respectively provided with a cold air regulating door and a hot air regulating door, and the cold air regulating door and the hot air regulating door are both connected with the controller;
the utility model provides a medium speed pulverizer coal blocking early warning and automatic processing device, includes:
a first pressure sensor and a flow sensor respectively disposed on the coal mill inlet conduit; a kind of electronic device with high-pressure air-conditioning system
A second pressure sensor disposed on the coal mill outlet conduit;
the first pressure sensor and the flow sensor are respectively used for collecting the pressure and the flow of the inlet of the coal mill and transmitting the pressure and the flow to the controller; the second pressure sensor is used for collecting the pressure of the outlet of the coal mill and transmitting the pressure to the controller;
the controller is connected with the early warning device; the controller is used for comparing the flow and the pressure difference of the inlet and outlet of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device if at least one signal is not in the corresponding normal threshold range; and the controller is also used for regulating the hot air regulating valve to enter the air quantity of the coal mill or regulating the cold air regulating valve to reduce the temperature of an outlet of the coal mill.
The second medium speed coal mill coal blocking early warning and automatic processing device is characterized in that cold air in a cold air pipeline is mixed with hot air in a hot air pipeline and then is introduced into the medium speed coal mill; the cold air pipeline and the hot air pipeline are respectively provided with a cold air regulating door and a hot air regulating door, and the cold air regulating door and the hot air regulating door are both connected with the controller;
the utility model provides a medium speed pulverizer coal blocking early warning and automatic processing device, includes:
a first pressure sensor disposed on the coal pulverizer inlet conduit; a kind of electronic device with high-pressure air-conditioning system
A temperature sensor, a second pressure sensor and a wind speed sensor respectively arranged on the outlet pipeline of the coal mill;
the first pressure sensor is used for collecting the pressure of the inlet of the coal mill and transmitting the pressure to the controller; the temperature sensor, the second pressure sensor and the wind speed sensor are respectively used for collecting the temperature, the pressure and the wind speed of the outlet of the coal mill and transmitting the temperatures, the pressure and the wind speed to the controller;
the controller is connected with the early warning device; the controller is used for comparing the wind speed, the temperature of the outlet of the coal mill and the pressure difference of the inlet and outlet of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device if at least one signal is not in the corresponding normal threshold range; and the controller is also used for regulating the hot air regulating valve to enter the air quantity of the coal mill or regulating the cold air regulating valve to reduce the temperature of an outlet of the coal mill.
The third medium speed coal mill coal blocking early warning and automatic processing device is that cold air in the cold air pipeline is mixed with hot air in the hot air pipeline and then is introduced into the medium speed coal mill; the cold air pipeline and the hot air pipeline are respectively provided with a cold air regulating door and a hot air regulating door, and the cold air regulating door and the hot air regulating door are both connected with the controller;
the utility model provides a medium speed pulverizer coal blocking early warning and automatic processing device, includes:
a first pressure sensor and a flow sensor respectively disposed on the coal mill inlet conduit; a kind of electronic device with high-pressure air-conditioning system
A temperature sensor, a second pressure sensor and a wind speed sensor respectively arranged on the outlet pipeline of the coal mill;
the first pressure sensor and the flow sensor are respectively used for collecting inlet pressure and flow of the coal mill and transmitting the inlet pressure and the flow to the controller;
the temperature sensor, the second pressure sensor and the wind speed sensor are respectively used for collecting the temperature, the pressure and the wind speed of the outlet of the coal mill and transmitting the temperatures, the pressure and the wind speed to the controller;
the controller is connected with the early warning device; the controller is used for comparing the acquired air speed of the outlet of the coal mill, the temperature of the outlet of the coal mill, the flow of the inlet of the coal mill and the pressure difference of the inlet and the outlet of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device if at least one signal is not in a corresponding normal threshold range; and the controller is also used for regulating the hot air regulating valve to enter the air quantity of the coal mill or regulating the cold air regulating valve to reduce the temperature of an outlet of the coal mill.
Further, the controller is also connected with the coal engine, and when the controller outputs a coal blocking signal, the controller is also used for reducing the rotating speed of the coal engine. Once the coal blocking signal disappears, the controller does not send out the instruction for reducing the rotating speed of the engine of the coal machine, and the medium-speed coal mill enters a normal mode.
Further, the medium speed coal mill coal blockage early warning and automatic processing device further comprises a current sensor and a coal feeder rotating speed sensor, wherein the current sensor is used for detecting the current of the coal mill and transmitting the current to the controller, and the coal mill rotating speed sensor is used for detecting the rotating speed of a coal mill engine and transmitting the rotating speed to the controller; the controller is used for comparing the current of the coal mill and the rotating speed of the engine of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device when at least one signal is not in the corresponding normal threshold range.
The invention provides a working method of a coal blockage early warning and automatic processing device of a medium-speed coal mill.
Aiming at the coal blockage early warning and automatic processing device of the three medium-speed coal mills, the working method scheme is as follows:
the working method of the first medium speed coal mill coal blockage early warning and automatic processing device comprises the following steps:
the first pressure sensor and the flow sensor respectively collect the pressure and the flow of the inlet of the coal mill and transmit the pressure and the flow to the controller; the second pressure sensor collects the pressure of the outlet of the coal mill and transmits the pressure to the controller;
the controller respectively compares the flow and the pressure difference of the inlet and the outlet of the coal mill with corresponding threshold values, and if at least one signal is not in the corresponding normal threshold value range, the controller outputs a coal blocking signal to the early warning device; and meanwhile, the controller also regulates the hot air regulating gate to enter the air quantity of the coal mill or regulates the cold air regulating gate to reduce the temperature of an outlet of the coal mill.
The working method of the second medium speed coal mill coal blockage early warning and automatic processing device comprises the following steps:
the first pressure sensor collects the pressure of the inlet of the coal mill and transmits the pressure to the controller; the temperature sensor, the second pressure sensor and the wind speed sensor respectively acquire the temperature, the pressure and the wind speed of the outlet of the coal mill and transmit the temperature, the pressure and the wind speed to the controller;
the controller compares the wind speed, the temperature of the outlet of the coal mill and the pressure difference of the inlet and the outlet of the coal mill with corresponding thresholds respectively, and if at least one signal is not in the corresponding normal threshold range, the controller outputs a coal blocking signal to the early warning device; and meanwhile, the controller also regulates the hot air regulating gate to enter the air quantity of the coal mill or regulates the cold air regulating gate to reduce the temperature of an outlet of the coal mill.
The working method of the third medium speed coal mill coal blockage early warning and automatic processing device comprises the following steps:
the first pressure sensor and the flow sensor respectively collect the pressure and the flow of the inlet of the coal mill and transmit the pressure and the flow to the controller;
the temperature sensor, the second pressure sensor and the wind speed sensor respectively acquire the temperature, the pressure and the wind speed of the outlet of the coal mill and transmit the temperature, the pressure and the wind speed to the controller;
the controller respectively compares the collected outlet wind speed of the coal mill, the temperature of the outlet of the coal mill, the flow of the inlet of the coal mill and the pressure difference of the inlet and the outlet of the coal mill with corresponding thresholds, and if at least one signal is not in the corresponding normal threshold range, the controller outputs a coal blocking signal to the early warning device; and meanwhile, the controller also regulates the hot air regulating gate to enter the air quantity of the coal mill or regulates the cold air regulating gate to reduce the temperature of an outlet of the coal mill.
Compared with the prior art, the invention has the beneficial effects that:
(1) The coal blocking early warning and automatic processing device of the medium speed coal mill can not only early warn coal blocking, but also realize automatic processing of abnormal coal blocking, prevent expansion of accidents and effectively promote safe and stable operation of the coal mill and the unit. The invention is especially suitable for power plants and thermal power plant users adopting medium-speed coal mills.
(2) The invention detects the flow entering the coal mill, the air speed of the outlet pipe, the temperature of the outlet pipe, the differential pressure of the inlet and outlet of the coal mill and the current of the coal mill in real time, and respectively compares the signals with corresponding threshold values to judge whether the coal blocking phenomenon occurs in the medium-speed coal mill or not, and then outputs early warning to prompt related personnel to monitor.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
FIG. 1 is a schematic view of a medium speed coal pulverizer.
Fig. 2 is a schematic structural diagram of an embodiment of a coal blocking early warning and automatic processing device for a medium speed coal mill.
Fig. 3 is a schematic diagram of a second embodiment of a coal blocking early warning and automatic processing device for a medium speed coal mill.
Fig. 4 is a schematic diagram of a three-structure embodiment of a coal blocking early warning and automatic processing device of a medium speed coal mill.
Wherein, (1) a cold air pipeline, (2) a cold air gate, (3) a cold air gate, (4) a hot air pipeline, (5) a hot air gate, (6) a hot air gate, (7) a total gate, (8) a coal mill motor, (9) a coal mill, (10) a coal feeder, (11) a coal dropping pipe, (12) a coal mill outlet pipe, and (13) an operator station.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
FIG. 1 is a schematic view of a medium speed coal pulverizer.
As shown in fig. 1, after cold air is mixed with hot air passing through the hot air pipeline (4), the hot air gate (5) and the hot air gate (6) through the cold air pipeline (1), the cold air gate (2) and the cold air gate (3), the cold air enters the coal mill (9) through the total gate (7), raw coal enters the millstone of the coal mill (9) through the coal dropping pipe (11) through the coal feeder (10), the motor (8) drives the millstone to rotate, the raw coal is crushed into powder when entering a milling layer between the milling roller and the millstone, the fine powder is blown out by air, and the fine powder is blown into a hearth through the separator and the coal mill outlet pipe (12) for combustion.
In order to solve the problem in the prior art that the coal blocking signal of the coal mill is used currently, operators are reminded only by means of the differential pressure signal of the inlet and outlet of the coal mill. The method has the defect that: firstly, a single pressure measuring point is easy to block, and if any dead point at an inlet or an outlet cannot send an alarm signal; secondly, the influence of the air quantity and the output of the coal mill is large, and operators can only judge whether coal is blocked according to respective experience, so that misjudgment and missed judgment are often caused; thirdly, alarming is delayed; fourthly, even if the coal blockage is found, the problems that the coal blockage can only be manually operated and processed and cannot be automatically processed are solved.
Example 1
Fig. 2 is a schematic structural diagram of an embodiment of a coal blocking early warning and automatic processing device for a medium speed coal mill.
As shown in fig. 2, the coal blocking early warning and automatic processing device of the medium speed coal mill is characterized in that cold air in the cold air pipeline is mixed with hot air in the hot air pipeline and then is introduced into the medium speed coal mill; the cold air pipeline and the hot air pipeline are respectively provided with a cold air regulating door and a hot air regulating door, and the cold air regulating door and the hot air regulating door are both connected with the controller;
the utility model provides a medium speed pulverizer coal blocking early warning and automatic processing device, includes:
a first pressure sensor and a flow sensor respectively disposed on the coal mill inlet conduit; a kind of electronic device with high-pressure air-conditioning system
A second pressure sensor disposed on the coal mill outlet conduit;
the first pressure sensor and the flow sensor are respectively used for collecting the pressure P1 and the flow F of the inlet of the coal mill and transmitting the pressure P1 and the flow F to the controller; the second pressure sensor is used for collecting the pressure P2 of the outlet of the coal mill and transmitting the pressure P2 to the controller;
the controller is connected with the early warning device; the controller is used for comparing the flow F and the pressure difference delta P of the inlet and outlet of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device if at least one signal is not in the corresponding normal threshold range; and the controller is also used for regulating the hot air regulating valve to enter the air quantity of the coal mill or regulating the cold air regulating valve to reduce the temperature of an outlet of the coal mill.
The controller is also connected with the coal engine, and is also used for reducing the rotating speed of the coal engine when the controller outputs a coal blocking signal. Once the coal blocking signal disappears, the controller does not send out the instruction for reducing the rotating speed of the engine of the coal machine, and the medium-speed coal mill enters a normal mode.
The medium speed coal mill coal blockage early warning and automatic processing device further comprises a current sensor and a coal feeder rotating speed sensor, wherein the current sensor is used for detecting the current A of the coal mill and transmitting the current A to the controller, and the coal mill rotating speed sensor is used for detecting the rotating speed G of the engine of the coal mill and transmitting the rotating speed G to the controller; the controller is used for comparing the current of the coal mill and the rotating speed of the engine of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device when at least one signal is not in the corresponding normal threshold range.
The controller comprises a delta A coal blockage early warning module and a delta B automatic processing module.
(1) Delta A coal blockage early warning module principle:
(a) The input signals are: the flow F entering the coal mill and the differential pressure delta P at the inlet and outlet of the coal mill;
(b) The output signal is: the coal blockage alarm signal I is transmitted to an operator station (13), wherein the early warning device is arranged in the operator station (13); and secondly, the processed product is conveyed to an automatic processing module delta B.
And when the controller judges that the flow F of the coal mill is lower than a fixed value or/and the differential pressure delta P Gao Yuding value of the inlet and outlet of the coal mill, the controller sends out a coal blocking signal.
(2) Triangle B automatic processing module principle:
(a) The input signals are: a coal blocking signal;
(b) The output signal is: the output command opens the large hot air regulating gate (6) to improve the air quantity F entering the coal mill, the command is issued to regulate the cold air regulating gate (3) to control the temperature T2 of the outlet pipe of the coal mill, and the command is issued to reduce the rotating speed G of the coal feeder.
Once the coal blocking signal disappears, the automatic processing module DeltaB exits, the instruction is terminated, and the normal mode is regulated to be entered.
The working method of the coal blocking early warning and automatic processing device of the medium speed coal mill comprises the following steps:
the first pressure sensor and the flow sensor respectively collect the pressure and the flow of the inlet of the coal mill and transmit the pressure and the flow to the controller; the second pressure sensor collects the pressure of the outlet of the coal mill and transmits the pressure to the controller;
the controller respectively compares the flow and the pressure difference of the inlet and the outlet of the coal mill with corresponding threshold values, and if at least one signal is not in the corresponding normal threshold value range, the controller outputs a coal blocking signal to the early warning device; and meanwhile, the controller also regulates the hot air regulating gate to enter the air quantity of the coal mill or regulates the cold air regulating gate to reduce the temperature of an outlet of the coal mill.
Example 2
Fig. 3 is a schematic diagram of a second embodiment of a coal blocking early warning and automatic processing device for a medium speed coal mill.
As shown in fig. 3, in the device for early warning and automatic treatment of coal blockage of the medium speed coal mill in this embodiment, cold air in the cold air duct is mixed with hot air in the hot air duct and then introduced into the medium speed coal mill; the cold air pipeline and the hot air pipeline are respectively provided with a cold air regulating door and a hot air regulating door, and the cold air regulating door and the hot air regulating door are both connected with the controller;
the utility model provides a medium speed pulverizer coal blocking early warning and automatic processing device, includes:
a first pressure sensor disposed on the coal pulverizer inlet conduit; a kind of electronic device with high-pressure air-conditioning system
A temperature sensor, a second pressure sensor and a wind speed sensor respectively arranged on the outlet pipeline of the coal mill;
the first pressure sensor is used for collecting the pressure P1 of the inlet of the coal mill and transmitting the pressure P1 to the controller; the temperature sensor, the second pressure sensor and the wind speed sensor are respectively used for acquiring the temperature T2, the pressure P2 and the wind speed V of the outlet of the coal mill and transmitting the temperatures to the controller;
the controller is connected with the early warning device; the controller is used for comparing the wind speed, the temperature of the outlet of the coal mill and the pressure difference of the inlet and outlet of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device if at least one signal is not in the corresponding normal threshold range; and the controller is also used for regulating the hot air regulating valve to enter the air quantity of the coal mill or regulating the cold air regulating valve to reduce the temperature of an outlet of the coal mill.
The controller is also connected with the coal engine, and is also used for reducing the rotating speed of the coal engine when the controller outputs a coal blocking signal. Once the coal blocking signal disappears, the controller does not send out the instruction for reducing the rotating speed of the engine of the coal machine, and the medium-speed coal mill enters a normal mode.
The medium speed coal mill coal blocking early warning and automatic processing device further comprises a current sensor and a coal feeder rotating speed sensor, wherein the current sensor is used for detecting the current of the coal mill and transmitting the current to the controller, and the coal mill rotating speed sensor is used for detecting the rotating speed of an engine of the coal mill and transmitting the rotating speed to the controller; the controller is used for comparing the current of the coal mill and the rotating speed of the engine of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device when at least one signal is not in the corresponding normal threshold range.
The controller comprises a delta A coal blockage early warning module and a delta B automatic processing module.
(1) Delta A coal blockage early warning module principle:
(a) The input signals are: the flow F entering the coal mill and the differential pressure delta P at the inlet and outlet of the coal mill;
(b) The output signal is: the coal blockage alarm signal I is transmitted to an operator station (13), wherein the early warning device is arranged in the operator station (13); and secondly, the processed product is conveyed to an automatic processing module delta B.
And when the controller judges that the flow F of the coal mill is lower than a fixed value or/and the differential pressure delta P Gao Yuding value of the inlet and outlet of the coal mill, the controller sends out a coal blocking signal.
(2) Triangle B automatic processing module principle:
(a) The input signals are: a coal blocking signal;
(b) The output signal is: the output command opens the large hot air regulating gate (6) to improve the air quantity F entering the coal mill, the command is issued to regulate the cold air regulating gate (3) to control the temperature T2 of the outlet pipe of the coal mill, and the command is issued to reduce the rotating speed G of the coal feeder.
Once the coal blocking signal disappears, the automatic processing module DeltaB exits, the instruction is terminated, and the normal mode is regulated to be entered.
The working method of the coal blocking early warning and automatic processing device of the medium speed coal mill comprises the following steps:
the first pressure sensor collects the pressure of the inlet of the coal mill and transmits the pressure to the controller; the temperature sensor, the second pressure sensor and the wind speed sensor respectively acquire the temperature, the pressure and the wind speed of the outlet of the coal mill and transmit the temperature, the pressure and the wind speed to the controller;
the controller compares the wind speed, the temperature of the outlet of the coal mill and the pressure difference of the inlet and the outlet of the coal mill with corresponding thresholds respectively, and if at least one signal is not in the corresponding normal threshold range, the controller outputs a coal blocking signal to the early warning device; and meanwhile, the controller also regulates the hot air regulating gate to enter the air quantity of the coal mill or regulates the cold air regulating gate to reduce the temperature of an outlet of the coal mill.
Example 3
Fig. 4 is a schematic diagram of a three-structure embodiment of a coal blocking early warning and automatic processing device of a medium speed coal mill.
As shown in fig. 4, in the device for early warning and automatic treatment of coal blockage of the medium speed coal mill in this embodiment, cold air in the cold air duct is mixed with hot air in the hot air duct and then introduced into the medium speed coal mill; the cold air pipeline and the hot air pipeline are respectively provided with a cold air regulating door and a hot air regulating door, and the cold air regulating door and the hot air regulating door are both connected with the controller;
the utility model provides a medium speed pulverizer coal blocking early warning and automatic processing device, includes:
a first pressure sensor and a flow sensor respectively disposed on the coal mill inlet conduit; a kind of electronic device with high-pressure air-conditioning system
A temperature sensor, a second pressure sensor and a wind speed sensor respectively arranged on the outlet pipeline of the coal mill;
the first pressure sensor and the flow sensor are respectively used for collecting inlet pressure P1 and flow F of the coal mill and transmitting the inlet pressure P1 and the flow F to the controller;
the temperature sensor, the second pressure sensor and the wind speed sensor are respectively used for acquiring the temperature T2, the pressure P2 and the wind speed V of the outlet of the coal mill and transmitting the temperatures to the controller;
the controller is connected with the early warning device; the controller is used for comparing the acquired air speed of the outlet of the coal mill, the temperature of the outlet of the coal mill, the flow of the inlet of the coal mill and the pressure difference of the inlet and the outlet of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device if at least one signal is not in a corresponding normal threshold range; and the controller is also used for regulating the hot air regulating valve to enter the air quantity of the coal mill or regulating the cold air regulating valve to reduce the temperature of an outlet of the coal mill.
The controller is also connected with the coal engine, and is also used for reducing the rotating speed of the coal engine when the controller outputs a coal blocking signal. Once the coal blocking signal disappears, the controller does not send out the instruction for reducing the rotating speed of the engine of the coal machine, and the medium-speed coal mill enters a normal mode.
The medium speed coal mill coal blocking early warning and automatic processing device further comprises a current sensor and a coal feeder rotating speed sensor, wherein the current sensor is used for detecting the current of the coal mill and transmitting the current to the controller, and the coal mill rotating speed sensor is used for detecting the rotating speed of an engine of the coal mill and transmitting the rotating speed to the controller; the controller is used for comparing the current of the coal mill and the rotating speed of the engine of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device when at least one signal is not in the corresponding normal threshold range.
The controller comprises a delta A coal blockage early warning module and a delta B automatic processing module.
(1) Delta A coal blockage early warning module principle:
(a) The input signals are: the flow F entering the coal mill and the differential pressure delta P at the inlet and outlet of the coal mill;
(b) The output signal is: the coal blockage alarm signal I is transmitted to an operator station (13), wherein the early warning device is arranged in the operator station (13); and secondly, the processed product is conveyed to an automatic processing module delta B.
And when the controller judges that the flow F of the coal mill is lower than a fixed value or/and the differential pressure delta P Gao Yuding value of the inlet and outlet of the coal mill, the controller sends out a coal blocking signal.
(2) Triangle B automatic processing module principle:
(a) The input signals are: a coal blocking signal;
(b) The output signal is: the output command opens the large hot air regulating gate (6) to improve the air quantity F entering the coal mill, the command is issued to regulate the cold air regulating gate (3) to control the temperature T2 of the outlet pipe of the coal mill, and the command is issued to reduce the rotating speed G of the coal feeder.
Once the coal blocking signal disappears, the automatic processing module DeltaB exits, the instruction is terminated, and the normal mode is regulated to be entered.
The working method of the coal blocking early warning and automatic processing device of the medium speed coal mill comprises the following steps:
the first pressure sensor and the flow sensor respectively collect the pressure and the flow of the inlet of the coal mill and transmit the pressure and the flow to the controller;
the temperature sensor, the second pressure sensor and the wind speed sensor respectively acquire the temperature, the pressure and the wind speed of the outlet of the coal mill and transmit the temperature, the pressure and the wind speed to the controller;
the controller respectively compares the collected outlet wind speed of the coal mill, the temperature of the outlet of the coal mill, the flow of the inlet of the coal mill and the pressure difference of the inlet and the outlet of the coal mill with corresponding thresholds, and if at least one signal is not in the corresponding normal threshold range, the controller outputs a coal blocking signal to the early warning device; and meanwhile, the controller also regulates the hot air regulating gate to enter the air quantity of the coal mill or regulates the cold air regulating gate to reduce the temperature of an outlet of the coal mill.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (9)
1. The coal blocking early warning and automatic processing device for the medium speed coal mill is characterized in that cold air in a cold air pipeline is mixed with hot air in a hot air pipeline and then is introduced into the medium speed coal mill; the cold air pipeline and the hot air pipeline are respectively provided with a cold air regulating door and a hot air regulating door, and the cold air regulating door and the hot air regulating door are both connected with the controller;
the utility model provides a medium speed pulverizer coal blocking early warning and automatic processing device, includes:
a first pressure sensor and a flow sensor respectively disposed on the coal mill inlet conduit; a kind of electronic device with high-pressure air-conditioning system
A second pressure sensor disposed on the coal mill outlet conduit;
the first pressure sensor and the flow sensor are respectively used for collecting the pressure and the flow of the inlet of the coal mill and transmitting the pressure and the flow to the controller; the second pressure sensor is used for collecting the pressure of the outlet of the coal mill and transmitting the pressure to the controller;
the controller is connected with the early warning device; the controller is used for comparing the flow of the inlet of the coal mill and the pressure difference of the inlet and the outlet of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device if at least one signal is not in a corresponding normal threshold range; specifically, the controller judges that the flow of the inlet of the coal mill is lower than a fixed value or/and the inlet and outlet difference of the coal mill is higher than a fixed value, and then the controller sends a coal blocking signal; the controller is also used for adjusting the hot air adjusting gate to increase the air quantity entering the coal mill or adjusting the cold air adjusting gate to reduce the temperature of the outlet of the coal mill;
the controller is also connected with the coal engine, and is also used for reducing the rotating speed of the coal engine when the controller outputs a coal blocking signal;
the controller comprises a DeltaA coal blockage early warning module and a DeltaB automatic processing module:
delta A coal blockage early warning module principle:
the a input signal is: the flow F entering the inlet of the coal mill and the differential pressure delta P of the inlet and the outlet of the coal mill;
the b output signal is: the coal blocking alarm signal I is transmitted to an operator station, wherein the early warning device is arranged in the operator station; secondly, conveying the waste water to an automatic processing module delta B;
when the controller judges that the flow F of the inlet of the coal mill is lower than a fixed value or/and the differential pressure delta P Gao Yuding value of the inlet and the outlet of the coal mill, the controller sends a coal blocking signal;
triangle B automatic processing module principle:
the a input signal is: a coal blocking signal;
the b output signal is: outputting an instruction to open a hot air regulating gate to improve the air quantity F entering the coal mill, and simultaneously, instructing to adjust a cold air regulating gate to control the temperature T2 of an outlet pipe of the coal mill and instruct to reduce the rotating speed G of the coal feeder;
once the coal blocking signal disappears, the automatic processing module DeltaB exits, the instruction is terminated, and the normal mode is regulated to be entered.
2. The device for early warning and automatically processing the coal blockage of the medium speed coal mill according to claim 1, wherein the device for early warning and automatically processing the coal blockage of the medium speed coal mill further comprises a current sensor and a coal feeder rotating speed sensor, wherein the current sensor is used for detecting the current of the coal mill and transmitting the current to the controller, and the coal feeder rotating speed sensor is used for detecting the rotating speed of an engine of the coal mill and transmitting the rotating speed to the controller; the controller is used for comparing the current of the coal mill and the rotating speed of the engine of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device when at least one signal is not in the corresponding normal threshold range.
3. A method of operating a medium speed coal pulverizer coal blockage pre-warning and automatic handling device as defined in any one of claims 1-2, comprising:
the first pressure sensor and the flow sensor respectively collect the pressure and the flow of the inlet of the coal mill and transmit the pressure and the flow to the controller; the second pressure sensor collects the pressure of the outlet of the coal mill and transmits the pressure to the controller;
the controller compares the flow of the inlet of the coal mill and the pressure difference of the inlet and the outlet of the coal mill with corresponding thresholds respectively, and if at least one signal is not in the corresponding normal threshold range, the controller outputs a coal blocking signal to the early warning device; and meanwhile, the controller also regulates the hot air regulating gate to enter the air quantity of the coal mill or regulates the cold air regulating gate to reduce the temperature of an outlet of the coal mill.
4. The coal blocking early warning and automatic processing device for the medium speed coal mill is characterized in that cold air in a cold air pipeline is mixed with hot air in a hot air pipeline and then is introduced into the medium speed coal mill; the cold air pipeline and the hot air pipeline are respectively provided with a cold air regulating door and a hot air regulating door, and the cold air regulating door and the hot air regulating door are both connected with the controller;
the utility model provides a medium speed pulverizer coal blocking early warning and automatic processing device, includes:
a first pressure sensor disposed on the coal pulverizer inlet conduit; a kind of electronic device with high-pressure air-conditioning system
A temperature sensor, a second pressure sensor and a wind speed sensor respectively arranged on the outlet pipeline of the coal mill;
the first pressure sensor is used for collecting the pressure of the inlet of the coal mill and transmitting the pressure to the controller; the temperature sensor, the second pressure sensor and the wind speed sensor are respectively used for collecting the temperature, the pressure and the wind speed of the outlet of the coal mill and transmitting the temperatures, the pressure and the wind speed to the controller;
the controller is connected with the early warning device; the controller is used for comparing the wind speed, the temperature of the outlet of the coal mill and the pressure difference of the inlet and outlet of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device if at least one signal is not in the corresponding normal threshold range; the controller is also used for adjusting the hot air adjusting gate to increase the air quantity entering the coal mill or adjusting the cold air adjusting gate to reduce the temperature of the outlet of the coal mill;
the controller is also connected with the coal engine, and is also used for reducing the rotating speed of the coal engine when the controller outputs a coal blocking signal;
the controller comprises a DeltaA coal blockage early warning module and a DeltaB automatic processing module:
delta A coal blockage early warning module principle:
the a input signal is: the flow F entering the inlet of the coal mill and the differential pressure delta P of the inlet and the outlet of the coal mill;
the b output signal is: the coal blocking alarm signal I is transmitted to an operator station, wherein the early warning device is arranged in the operator station; secondly, conveying the waste water to an automatic processing module delta B;
when the controller judges that the flow F of the inlet of the coal mill is lower than a fixed value or/and the differential pressure delta P Gao Yuding value of the inlet and the outlet of the coal mill, the controller sends a coal blocking signal;
triangle B automatic processing module principle:
the a input signal is: a coal blocking signal;
the b output signal is: outputting an instruction to open a hot air regulating gate to improve the air quantity F entering the coal mill, and simultaneously, instructing to adjust a cold air regulating gate to control the temperature T2 of an outlet pipe of the coal mill and instruct to reduce the rotating speed G of the coal feeder;
once the coal blocking signal disappears, the automatic processing module DeltaB exits, the instruction is terminated, and the normal mode is regulated to be entered.
5. The coal blocking early warning and automatic processing device for the medium speed coal mill is characterized in that cold air in a cold air pipeline is mixed with hot air in a hot air pipeline and then is introduced into the medium speed coal mill; the cold air pipeline and the hot air pipeline are respectively provided with a cold air regulating door and a hot air regulating door, and the cold air regulating door and the hot air regulating door are both connected with the controller;
the utility model provides a medium speed pulverizer coal blocking early warning and automatic processing device, includes:
a first pressure sensor and a flow sensor respectively disposed on the coal mill inlet conduit; a kind of electronic device with high-pressure air-conditioning system
A temperature sensor, a second pressure sensor and a wind speed sensor respectively arranged on the outlet pipeline of the coal mill;
the first pressure sensor and the flow sensor are respectively used for collecting inlet pressure and flow of the coal mill and transmitting the inlet pressure and the flow to the controller;
the temperature sensor, the second pressure sensor and the wind speed sensor are respectively used for collecting the temperature, the pressure and the wind speed of the outlet of the coal mill and transmitting the temperatures, the pressure and the wind speed to the controller;
the controller is connected with the early warning device; the controller is used for comparing the acquired air speed of the outlet of the coal mill, the temperature of the outlet of the coal mill, the flow of the inlet of the coal mill and the pressure difference of the inlet and the outlet of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device if at least one signal is not in a corresponding normal threshold range; the controller is also used for adjusting the hot air adjusting gate to increase the air quantity entering the coal mill or adjusting the cold air adjusting gate to reduce the temperature of the outlet of the coal mill;
the controller is also connected with the coal engine, and is also used for reducing the rotating speed of the coal engine when the controller outputs a coal blocking signal;
the controller comprises a DeltaA coal blockage early warning module and a DeltaB automatic processing module:
delta A coal blockage early warning module principle:
the a input signal is: the flow F entering the inlet of the coal mill and the differential pressure delta P of the inlet and the outlet of the coal mill;
the b output signal is: the coal blocking alarm signal I is transmitted to an operator station, wherein the early warning device is arranged in the operator station; secondly, conveying the waste water to an automatic processing module delta B;
when the controller judges that the flow F of the inlet of the coal mill is lower than a fixed value or/and the differential pressure delta P Gao Yuding value of the inlet and the outlet of the coal mill, the controller sends a coal blocking signal;
triangle B automatic processing module principle:
the a input signal is: a coal blocking signal;
the b output signal is: outputting an instruction to open a hot air regulating gate to improve the air quantity F entering the coal mill, and simultaneously, instructing to adjust a cold air regulating gate to control the temperature T2 of an outlet pipe of the coal mill and instruct to reduce the rotating speed G of the coal feeder;
once the coal blocking signal disappears, the automatic processing module DeltaB exits, the instruction is terminated, and the normal mode is regulated to be entered.
6. The coal blocking early warning and automatic processing device of the medium speed coal mill according to claim 4 or 5, wherein the controller is further connected with the coal engine, and is further used for reducing the rotation speed of the coal engine when the controller outputs a coal blocking signal.
7. The device for early warning and automatically processing the coal blockage of the medium speed coal mill according to claim 6, further comprising a current sensor and a coal feeder rotating speed sensor, wherein the current sensor is used for detecting the current of the coal mill and transmitting the current to the controller, and the coal feeder rotating speed sensor is used for detecting the rotating speed of an engine of the coal mill and transmitting the rotating speed to the controller; the controller is used for comparing the current of the coal mill and the rotating speed of the engine of the coal mill with corresponding thresholds respectively, and outputting a coal blocking signal to the early warning device when at least one signal is not in the corresponding normal threshold range.
8. The working method of the coal blockage early warning and automatic processing device of the medium speed coal mill according to claim 4 is characterized by comprising the following steps:
the first pressure sensor collects the pressure of the inlet of the coal mill and transmits the pressure to the controller; the temperature sensor, the second pressure sensor and the wind speed sensor respectively acquire the temperature, the pressure and the wind speed of the outlet of the coal mill and transmit the temperature, the pressure and the wind speed to the controller;
the controller compares the wind speed, the temperature of the outlet of the coal mill and the pressure difference of the inlet and the outlet of the coal mill with corresponding thresholds respectively, and if at least one signal is not in the corresponding normal threshold range, the controller outputs a coal blocking signal to the early warning device; and meanwhile, the controller also regulates the hot air regulating gate to enter the air quantity of the coal mill or regulates the cold air regulating gate to reduce the temperature of an outlet of the coal mill.
9. The working method of the coal blockage early warning and automatic processing device of the medium speed coal mill according to claim 5 is characterized by comprising the following steps:
the first pressure sensor and the flow sensor respectively collect the pressure and the flow of the inlet of the coal mill and transmit the pressure and the flow to the controller;
the temperature sensor, the second pressure sensor and the wind speed sensor respectively acquire the temperature, the pressure and the wind speed of the outlet of the coal mill and transmit the temperature, the pressure and the wind speed to the controller;
the controller respectively compares the collected outlet wind speed of the coal mill, the temperature of the outlet of the coal mill, the flow of the inlet of the coal mill and the pressure difference of the inlet and the outlet of the coal mill with corresponding thresholds, and if at least one signal is not in the corresponding normal threshold range, the controller outputs a coal blocking signal to the early warning device; and meanwhile, the controller also regulates the hot air regulating gate to enter the air quantity of the coal mill or regulates the cold air regulating gate to reduce the temperature of an outlet of the coal mill.
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| CN110918242B (en) * | 2019-10-18 | 2021-09-17 | 华创三立(北京)能源科技有限公司 | Coal mill monitoring and early warning method and system |
| CN111135944A (en) * | 2019-12-06 | 2020-05-12 | 华北电力科学研究院有限责任公司 | Method and system for determining coal blockage of coal mill of power station boiler |
| CN112115602B (en) * | 2020-09-14 | 2024-02-02 | 北京博望华科科技有限公司 | Coal mill pipeline blocking state determining method and device, storage medium and computing equipment |
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| CN115518763B (en) * | 2022-09-29 | 2023-06-20 | 德瑞洁能科技有限公司 | Coal blocking early warning and automatic processing device for coal mill |
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