Online pulverized coal concentration regulator and regulating method

Patent metadata

Field	Value
Publication number	US-12092327-B2
Application number	US-202017426534-A
Country	US
Kind code	B2
Filing date	Aug 21, 2020
Priority date	Jul 30, 2020
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

An online pulverized coal concentration regulator is mounted at a front end of a pulverized coal pipe, and a pulverized coal concentration detector is arranged in the pipe. The regulator includes a control system, and an output of the concentration detector is connected with a signal input end of the control system. The regulator includes a top plate, a regulating rod, and a powder baffle plate. A mounting hole for fixedly mounting the front end of the pipe and a through hole for the powder baffle plate to penetrate through are arranged in the top plate, and a connector is arranged between the regulating rod and the powder baffle plate. The regulator includes a guider slidably connected with the powder baffle plate and fixedly connected with the top plate, and a diversion plate arranged on the top plate and slidably connected with the powder baffle plate.

First claim

The invention claimed is:

1. An online pulverized coal concentration regulator mounted at a front end of a pulverized coal pipe, a pulverized coal concentration detector and a control system being arranged in the pulverized coal pipe, and an output of the pulverized coal concentration detector being electrically connected with a signal input end of the control system, the online pulverized coal concentration regulator comprising a top plate, a regulating rod, a guider, and a powder baffle plate,
wherein the top plate includes a mounting hole for fixedly mounting the front end of the pulverized coal pipe and a through hole for the powder baffle plate to penetrate through; a connector is arranged between the regulating rod and the powder baffle plate, and two ends of the connector are movably connected with the regulating rod and the powder baffle plate respectively; the guider is slidably connected with the powder baffle plate, and the guider is fixedly connected with the top plate; and a diversion plate is arranged on the top plate, and the diversion plate is slidably connected with the powder baffle plate.

2. The online pulverized coal concentration regulator according to claim 1 , wherein one end of the connector is provided with a sliding shaft, one end of the regulating rod is provided with a shaft hole, and the shaft hole is slidably connected with the sliding shaft; and one end of the powder baffle plate is movably connected with the connector in a hinged mode.

3. The online pulverized coal concentration regulator according to claim 1 , wherein the guider comprises two guiding wheels and a supporting rod, wheel axles of the guiding wheels are fixedly connected with one end of the supporting rod, and the other end of the supporting rod is fixedly connected with one side of the top plate; and the powder baffle plate is arranged between the two guiding wheels, and the guiding wheels are movably connected with the powder baffle plate.

4. The online pulverized coal concentration regulator according to claim 1 , wherein a diversion groove is arranged on the diversion plate; and one end of the diversion plate is movably connected with the other side of the top plate through a hinge.

5. The online pulverized coal concentration regulator according to claim 1 , further comprising an electric actuator, an output shaft of the electric actuator is fixedly connected with the other end of the regulating rod; and the electric actuator is electrically connected with an output end of the control system.

6. A method for regulating a pulverized coal concentration by the online pulverized coal concentration regulator according to claim 1 , comprising the following steps of:
S11: when a coal intake of the pulverized coal pipe needs to be reduced, controlling, by the control system, the electric actuator of the regulator mounted at the front end of the pulverized coal pipe to make the regulating rod drive the connector to move towards the top plate and make the connector move along the sliding shaft in a displacement, so that the powder baffle plate moves smoothly along the guider and an opening degree of the powder baffle plate is increased, thus increasing an area of the powder baffle plate capable of blocking pulverized coal and reducing an amount of pulverized coal entering the pulverized coal pipe;
S12: when the coal intake of the pulverized coal pipe needs to be increased, controlling, by the control system, the electric actuator of the regulator mounted at the front end of the pulverized coal pipe to make the regulating rod drive the connector to move away from the top plate and make the connector move along the sliding shaft in a displacement, so that the powder baffle plate moves smoothly along the guider and the opening degree of the powder baffle plate is reduced, thus reducing the area of the powder baffle plate capable of blocking the pulverized coal and increasing the amount of pulverized coal entering the pulverized coal pipe;
S2: transmitting, by the pulverized coal concentration detector in the pulverized coal pipe, detected pulverized coal concentration data to the control system, determining, by the control system, a pulverized coal concentration difference between a maximum pulverized coal concentration and a minimum pulverized coal concentration of the pulverized coal pipe, and comparing the pulverized coal concentration difference with a set concentration difference;
S21: if the pulverized coal concentration difference is lower than the set concentration difference, a working condition is in a normal state; and if the pulverized coal concentration difference is higher than the set concentration difference, the working condition is in an abnormal state;
S211: when the working condition in the abnormal state in step S21 occurs, judging whether the regulator mounted in the pulverized coal pipe with the minimum pulverized coal concentration is completely opened: if the opening degree of the powder baffle plate of the regulator is not 0, regulating the regulator to reduce the opening degree of the powder baffle plate, thereby increasing the pulverized coal concentration in the pulverized coal pipe, and judging the pulverized coal concentration in the pulverized coal pipe at the same time; and if the pulverized coal concentration in the pulverized coal pipe is still the minimum, continuing to regulate the regulator until the opening degree is 0; and
S212: when the opening degree of the pulverized coal pipe with the minimum pulverized coal concentration in S211 is 0, but the pulverized coal concentration difference is still higher than the set concentration difference, performing the step S11 on the pulverized coal pipe with the maximum pulverized coal concentration to reduce the amount of the pulverized coal entering the pulverized coal pipe, in the process of regulating the pulverized coal concentration, judging, by the control system, whether the difference between the maximum concentration and the minimum concentration is lower than the set value all the time, and if the difference is greater than the set value, continuing to regulate; and meanwhile, judging, by the control system, whether the pulverized coal pipe with the maximum concentration is changed, if the pulverized coal pipe with the maximum concentration is changed, instructing, by the control system, to stop regulating the original regulator with the maximum concentration and start regulating the current pulverized coal pipe with the maximum concentration.

Assignees

• Li Wei

Inventors

• Li Wei
• Li Cenwenda
• Zhang Qi

Classifications

• G05D7/0605

  specially adapted for solid materials · CPC title

• F23K2900/05001

  Control or safety devices in gaseous or liquid fuel supply lines · CPC title

• F23N2237/04

  at two or more different localities · CPC title

• G05D7/0611

  characterised by the set value given to the control element · CPC title

• B01F23/30

  Mixing gases with solids · CPC title