A control method and system for a scraper coal feeder

A technology of scraper coal feeder and control method, which is applied in the direction of grain processing, etc., can solve problems such as bad environmental impact, and achieve the effects of clear judgment standards, reduced false start, and high degree of automation

Active Publication Date: 2017-03-22
SNTO TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To pre-judge whether the coal is broken, because the coal feeder is not designed with an external observation hole, it is necessary to open the cover plates at both ends of the coal feeder, and the coal powder inside the coal feeder will be spilled on the entire floor of more than ten meters, which will have an impact on the environment. extremely bad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A control method for a scraper coal feeder, comprising the steps of:

[0036] A. The current transformer installed on the power supply of the scraper coal machine motor receives the power supply current, and outputs the secondary current to the current transmitter;

[0037] The current transformer has a current transformation ratio of 20 / 1, that is, the current intensity is reduced before sending out; the primary current should be 12-14A under normal conditions, and 8-9A when the coal is cut off.

[0038] B. After receiving the secondary current, the current transmitter outputs a 4-20mA current signal to the DCS system;

[0039] The current transmitter receives 0~1A current, and the output is 4~20mA;

[0040] C. When the current signal received by the DCS system is less than 12mA, a command to automatically start the rapper is issued.

[0041] Because the primary current of the equipment is less than 10A when the coal is cut off, the output current signal of the curre...

Embodiment 2

[0048] A control method for a scraper coal feeder, comprising the steps of:

[0049] A. The current transformer installed on the power supply of the scraper coal machine motor receives the power supply current, and outputs the secondary current to the current transmitter;

[0050] B. After receiving the secondary current, the current transmitter outputs a 4-20mA current signal to the DCS system;

[0051] C. When the current signal received by the DCS system is less than 12mA for the first time, the delay time period T1 sends out the command to automatically start the rapper;

[0052] D. Repeat steps A and B, and when the current signal received by the DCS system within the time period T1 is less than 12mA, it will issue a command to automatically start the rapper;

[0053] E. The rapper starts.

[0054] Repeat steps A and B again within the time period T1. When the current signal received by the DCS system for the second time is less than 12mA, a command to automatically sta...

Embodiment 3

[0061] A control method for a scraper coal feeder, comprising the steps of:

[0062] A. The current transformer installed on the power supply of the scraper coal machine motor receives the power supply current, and outputs the secondary current to the current transmitter;

[0063] B. After receiving the secondary current, the current transmitter outputs a 4-20mA current signal to the DCS system;

[0064] C. When the current signal received by the DCS system is less than 12mA for the first time, the delay time period T1 sends out the command to automatically start the rapper;

[0065] D. When the current signal received by the DCS system within the time period T1 is less than 12mA, it will issue a command to automatically start the rapper;

[0066] E. The rapper starts;

[0067] F. Repeat steps A and B. When the current signal received by the DCS system is greater than 12mA, the delay time period T2 sends a command to stop the rapper;

[0068] G. Repeat steps A and B, and wh...

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PUM

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Abstract

The present invention discloses a control method and a control system for a scraper coal feeder. The method comprises the steps of: a current transformer mounted on a power supply of the motor of the scraper coal feeder switches a power supply current and outputs a secondary current to a current transmitter; the current transmitter outputs a 4-20mA current signal to a DCS system after receiving the secondary current; and if the current signal received by the DCS system is less than 12mA, an instruction of automatically starting a vibrator is issued. The method and the system may make a pre-judgment before the coal in the scraper coal feeder is about to be cut off, and issues an order of starting the rapper.

Description

technical field [0001] The invention relates to the technical field, in particular to a control method and system for a scraper coal feeder. Background technique [0002] The coal discharge port of the raw coal bunker of the power plant is often blocked seriously, the scraper coal feeder frequently breaks coal, the efficiency of the pulverizing system decreases, the boiler temperature control is difficult, the unit output is affected, and the consumption of steel balls is also large. When it is observed that coal does not drop at the coal drop port, the on-site staff is required to immediately tap the lower hopper to make it unobstructed. [0003] To pre-judge whether the coal is broken, because the coal feeder is not designed with an external observation hole, it is necessary to open the cover plates at both ends of the coal feeder, and the coal powder inside the coal feeder will be spilled on the entire floor of more than ten meters, which will have an impact on the enviro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C25/00
Inventor 不公告发明人
Owner SNTO TECH GRP
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