CN-117819158-B - Control method and system for preventing powder return of coal feeder and coal feeder

CN117819158BCN 117819158 BCN117819158 BCN 117819158BCN-117819158-B

Abstract

The application provides a control method and a control system for preventing powder return of a coal feeder and the coal feeder, wherein the control method comprises the steps of carrying out power-on operation on a body of the coal feeder, and enabling coal powder to be adsorbed on a first position of the body for power-on operation according to the power-on operation; according to the first position, a conductive loop is formed between the pulverized coal and the first position, the current of the loop is determined according to the conductive loop, and when the current of the loop reaches a current threshold value, the body is powered off to prevent the pulverized coal from returning to the coal feeder. Through the electric current between the first position of monitoring buggy and the body of feeder, prevent that the feeder from depositing excessive buggy, prevent that buggy from taking place spontaneous combustion accident in the feeder is inside, have sensitivity height, stability strong characteristics, furthest improved the security of thermal power plant's equipment.

Inventors

LI YANHAO
RU YU
XIU JIANHUA
LIU ZHENTAO
REN JIANYONG
SUN ZHONGHAO
LI JIARUI
LIU ZIMENG

Assignees

华能烟台八角热电有限公司
北京华能长江环保科技研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20240104

Claims (6)

1. A control method for preventing powder return of a coal feeder, comprising the steps of: The method comprises the steps of carrying out power-on operation on a body of a coal feeder, generating an electric field at a first position of the power-on operation according to the power-on operation, and adsorbing coal dust at the first position according to the action of the electric field, wherein in the conveying process, the coal dust is electrified due to the friction action of the coal dust and air; according to the first position, a conductive loop is formed between the pulverized coal and the first position, wherein the pulverized coal is adsorbed on the first position, and when the mass of the pulverized coal exceeds a threshold value, the conductive loop is formed between the pulverized coal and the first position; Determining the conducted current according to the conductive loop, determining the characterization relation between the current value and the concentration of the particulate matters, and determining the threshold value of the current according to the conducted current; When the threshold value of the loop current reaches the current threshold value, an alarm is sent out through a device for monitoring the loop current, the power of the main body of the coal feeder is cut off according to the alarm, and the outlet of the coal feeder is shut down, so that the powder return of the coal feeder is prevented.
2. The method of claim 1, wherein the preventing of coal feeder fines comprises: based on the power failure of the body, carrying out powder removal on the first position; and after the powder removal is completed at the first position, continuously powering up the body of the coal feeder.
3. The method of claim 2, wherein the de-powdering the first location comprises: and (5) carrying out powder removal on the first position in a vibration mode.
4. A control system for preventing powder return of a coal feeder, which performs the method of any one of claims 1-3, and comprises an induction module, a control module, a vibration module, a clamping control module and a coal feeder body, wherein: The induction module is arranged at a first position of the coal feeder body and is used for adsorbing coal dust and forming a conductive loop with the coal dust; The control module is connected with the induction module, monitors the current of the conductive loop and controls the power-off action of the coal feeder body; The vibration module is closely attached to the induction module and used for removing powder from the first position; the clamping control module is arranged at the coal outlet of the coal feeder body and used for preventing pulverized coal from returning after the power of the coal feeder body is off.
5. The control system for preventing powder return of a coal feeder of claim 4, further comprising a relay module connected between the control module and the coal feeder body for regulating a power outage of the coal feeder body.
6. A coal feeder comprising the control system of claim 4 or 5 for preventing coal feeder fines.

Description

Control method and system for preventing powder return of coal feeder and coal feeder Technical Field The application relates to the technical field of application of coal conveying equipment of a thermal power plant, in particular to a control method and system for preventing powder return of a coal feeder and the coal feeder. Background The coal feeder is used as an important component of a power plant fuel conveying system, is arranged between a raw coal hopper and the coal mill, and can accurately adjust the coal feeding amount of the coal mill, adjust the combustion of a boiler and control the temperature and the pressure of main steam according to the power grid load requirement by adjusting the rotating speed of the coal feeder, so that the generating capacity of the whole unit is controlled, and the power grid system requirement is met. For the positive pressure type pulverizing system, if the barrel body is communicated with the atmosphere after the coal of the belt type coal feeder is broken, the pulverized coal in the coal mill is returned to the inside of the coal feeder, if the condition of the pulverized coal return of the coal feeder cannot be monitored in time, the coal feeder is isolated, a large amount of pulverized coal in the coal feeder is accumulated, and the pulverized coal in the coal feeder can be spontaneous combustion to cause fire disaster when serious. It should be noted that the foregoing description of the background art is only for the purpose of providing a clear and complete description of the technical solution of the present application and is presented for the convenience of understanding by those skilled in the art. The above-described solutions are not considered to be known to the person skilled in the art simply because they are set forth in the background of the application section. Disclosure of Invention The embodiment of the application provides a control method and a control system for preventing powder return of a coal feeder and the coal feeder. An embodiment of a first aspect of the present application provides a control method for preventing powder return of a coal feeder, including: the method comprises the steps of carrying out power-on operation on a body of a coal feeder, and enabling coal dust to be adsorbed at a first position of the body for power-on operation according to the power-on operation; according to the first position, a conductive loop is formed between the pulverized coal and the first position; determining the current of the loop according to the conductive loop; when the current of the loop reaches a current threshold value, the main body is powered off, and the powder return of the coal feeder is prevented. The embodiment of the second aspect of the application provides a control system for preventing powder return of a coal feeder, which comprises an induction module, a control module, a vibration module, a clamping control module and a coal feeder body, wherein: The induction module is arranged at a first position of the coal feeder body and is used for adsorbing coal dust and forming a conductive loop with the coal dust; The control module is connected with the induction module, monitors the current of the conductive loop and controls the power-off action of the coal feeder body; The vibration module is closely attached to the induction module and used for removing powder from the first position; the clamping control module is arranged at the coal outlet of the coal feeder body and used for preventing pulverized coal from returning after the power of the coal feeder body is off. An embodiment of a third aspect of the application provides a coal feeder, which comprises a control system for preventing the coal feeder from returning powder. The technical scheme provided by the embodiment of the application at least has the following beneficial effects: Through the electric current between the first position of monitoring buggy and the body of feeder, prevent that the feeder from depositing excessive buggy, prevent that buggy from taking place spontaneous combustion accident in the feeder is inside, have sensitivity height, stability strong characteristics, furthest improved the security of thermal power plant's equipment. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed. Drawings The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which: FIG. 1 is a schematic flow chart of a control method for preventing powder return of a coal feeder according to an embodiment of the application; FIG. 2 is a schematic flow chart of another method for controlling the powder return of a coal feeder according to an embodiment of the present