KR102250522B1 - System and Method for Automatic Processing Defect Detection and Relief of Air Lock Valve for Ash Treatment equipment - Google Patents

Abstract

The present invention relates to a system and a method for automatic processing defect detection and relief of an air lock valve for ash treatment equipment. An object of the present invention is to automatically detect a situation in which normal transport is not achieved since a main hopper for storing fly ash is clogged in a process of processing the fly ash and automatically resolve the clogging. The system for automatic processing defect detection and relief of an air lock valve for ash treatment equipment according to the present invention comprises: a pressure sensor (P) at the rear end of a transfer blower; and a controller (10) for determining clogging of the main hopper and controlling the relief of the clogging. The controller controls opening and closing of an upper gate and a lower gate, and controls driving of an actuator.

Description

System and Method for Automatic Processing Defect Detection and Relief of Air Lock Valve for Ash Treatment Equipment

The present invention relates to the elimination of clogging of an airlock valve for an ash treatment facility, and more particularly, in the process of processing fly ash, the main hopper storing the fly ash is blocked, and a situation in which normal transfer cannot be performed is automatically detected and automatically The present invention relates to a method for detecting and eliminating automatic processing defects of an airlock valve for an ash treatment facility that eliminates clogging.

This part provides background information related to the content of the present application, and is not necessarily prior art.

In the combustion process of coal-fired power plants, coal ash, which is a non-combustible ash, is produced. Coal ash is classified into bottom ash (bottom ash) that is attached to the furnace wall, superheater, reheater, etc. and falls to the bottom of the boiler by its own weight, and fly ash (fly ash) that is scattered into the atmosphere inside the boiler.

Fly ash is temporarily stored in the airlock valve and then transported to the fly ash silo or discarded in the ash landfill along the high-pressure air flow supplied by the transport blower, and then transferred to the fly ash storage tank. Fly ash is recycled for use as concrete admixtures after refining.

The airlock valve includes a main hopper receiving fly ash, an upper gate opening and closing the discharge part of the main hopper, a sub hopper connected to a lower part of the upper gate to store fly ash falling from the main hopper, and a discharge part of the sub hopper. It consists of a lower gate that opens and closes, and a transfer means (transfer blower, transfer pipe, nozzle, etc.) that injects transfer air into the sub-hopper to help discharge fly ash. It is connected to the pipe and configured to discharge and transport fly ash to the transport pipe at a time difference.

As described above, fly ash is temporarily stored in the airlock valve, then discharged from the airlock valve and transferred to the fly ash storage tank by a transport blower. There were often cases where it was hardened to a state and was not discharged.

If the fly ash temporarily stored in the air lock valve is hardened and is not discharged from the air lock valve, the operation efficiency of the ash treatment facility decreases, and the ash treatment is not smoothly performed, and various problems may occur in the operation of the generator. .

The patent document (Registration Patent No. 10-1910534) stores ash collected by a dust collector, and includes a hopper unit provided with an outlet for a hopper through which the stored ash is discharged; A stirring unit supported by the hopper unit and stirring the ash stored in the hopper unit; And a valve unit connected to the hopper unit and opening and closing the outlet for the hopper, wherein the hopper unit has a rectangular box shape and is connected to a supply line for supplying the ash. ; And a hopper lower body part connected to the upper body part of the hopper and provided in a conical shape whose inner diameter decreases downwardly, wherein the valve unit is connected to the lower body part of the hopper, and is provided with a hollow inside. chamber; An opening/closing part supported by the valve chamber and pivoted inside the valve chamber to open and close the outlet for the hopper; And a pivot driving unit supported by the valve chamber and connected to the opening and closing unit to pivot the opening and closing unit. It is only to prevent ash from agglomeration and detects that the discharge unit of the hopper is clogged, There is no technology to automatically resolve the blockage by judging.

Registered Patent No. 10-1910534

The present invention is to solve the above-described problems, and an ash treatment facility that automatically detects a situation in which normal transfer cannot be achieved due to clogging of the main hopper storing fly ash in the process of processing fly ash, and automatically eliminates the blockage. It is an object of the present invention to provide a system and method for detecting and resolving defects in automatic processing of airlock valves for use.

A method of detecting and eliminating automatic processing defects of an airlock valve for an ash treatment facility according to the present invention includes: a first step of sensing pressures of sub-hoppers configured in two or more airlock valves connected in series; A second step of determining clogging of a main hopper connected to an upper portion of the sub hopper based on the pressures of the sub hoppers sensed through the first step; In order to eliminate the clogging of the main hopper determined as clogging through the second step, air is supplied to the main hopper in a state in which the upper gate opening and closing the discharge part of the main hopper is opened and controlled while the lower gate of the sub hopper is closed. It characterized in that it comprises a third step of forcibly spraying to eliminate the clogging.

According to the system and method for detecting and eliminating automatic processing defects of an airlock valve for an ash treatment facility according to the present invention, the pressure of a plurality of main hoppers connected to a single conveying pipe is sensed, and the pressure is compared with a reference value or a relative comparison of the pressure. After determining the clogging through comparison, a series of processes for resolving the clogging are automated, enabling more efficient management than manual management by the operator, and also solving clogging caused by judgment errors, thus improving the operation efficiency of the ash treatment facility. .

In addition, when clogging is eliminated through the opening and closing control of the upper and lower gates applied to the airlock valve and the operation control of a transport blower, it can be used without additional large facilities, so the applicability is very excellent.

1 is a block diagram of a system for detecting and eliminating automatic processing defects of an airlock valve for an ash treatment facility according to the present invention.
2 is an exemplary view of an actuator for relieving clogging applied to a system for detecting and eliminating automatic processing defects of an airlock valve for an ash treatment facility according to the present invention.
3 is another exemplary view of an actuator for relieving clogging applied to a system for detecting and eliminating automatic processing defects of an airlock valve for an ash treatment facility according to the present invention.
Figure 4 is a flow chart of a method for detecting and eliminating automatic processing defects of the airlock valve for ash treatment equipment according to the present invention.
5 is a graph showing an example of sensing the pressures of the main hoppers for explaining a method of detecting and solving an automatic processing failure of an airlock valve for an ash treatment facility according to the present invention.

In the following description of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification.

As shown in Fig. 1, first, the first to fourth sub-hoppers (4-1,4-2,4-3) will be described in the automatic processing defect detection and resolution system of the airlock valve for ash treatment facilities according to the present invention. ,4-4) The first to fourth main hoppers (1-1,1-) based on the detection value of the pressure sensor (P) at the rear end of the transfer fan that senses the operating pressure of the (four are described as an example). 2,1-3,1-4) It is composed of a controller 10 that determines each blockage and determines the resolution of the blockage.

The pressure sensor (P) at the rear end of the transfer blower is installed at the front of the fly ash transfer pipe (CIA) stored in the first to fourth main hoppers (1-1,1-2,1-3,1-4), and -1,4-2,4-3,4-4) Detect the operating pressure in real time (as a fixed period, for example, at open discharge and at closed stop). The first to fourth main hoppers (1-1,1-2,1-3,1-4) sequentially discharge fly ash, so the pressure sensor (P) at the rear end of the transfer fan can sequentially check the four pressure changes. have.

The controller 10 is connected by wire or wirelessly to the pressure sensor P at the rear end of the transfer fan, and receives the detected values of the first to fourth main hoppers (1-1, 1-2, 1-3, 1-4). ) To determine the blockage.

Blockage detection and determination by the controller 10 will be described in detail in a method to be described later.

The configuration to eliminate the clogging of the first to fourth main hoppers (1-1,1-2,1-3,1-4) is to use a device already applied to the airlock valve, the first to the fourth In the main hopper (1-1, 1-2, 1-3, 1-4), there is an additional configuration of an air injector that injects high-pressure air toward their discharge portion and controls the drive.

In the former case, the transport blower includes first to fourth equalizer valves 20-1, 20-2, 20-3, and 20-4 to process fly ash of the first to fourth main hoppers. The first to fourth top gates 2-1,2-2,2-3,2-4 and the first to fourth bottom gates 3-1,3-2,3 -3,3-4) using the drive control, these are connected to the controller (10).

As shown in FIG. 2, when it is determined that the first main hopper 1-1 is blocked, the controller 10 closes the first lower gate 3-1 and controls the first upper gate 2-1 to open. Thus, the internal spaces of the first main hopper 1-1 and the first sub hopper 4-1 are made to communicate with each other while preventing the fly ash stored in the first sub hopper 4-1 from being discharged.

Subsequently, when the first equalizer valve 20-1 is opened, the transport air of the transport blower is blown into the first sub-hopper 4-1, and the transport air is supplied to the first sub-hopper 4-1. Since the discharge part of the is closed, it flows toward the opened first upper gate (2-1) and passes through the discharge part of the first upper gate (2-1) and the first main hopper (1-1), and discharges in this process. The clogging is eliminated by falling to the lower portion of the first upper gate 2-1 while the fly ash blocking the wealth is disturbed.

The clogging of the remaining main hoppers (1-2, 1-3, 1-4) is also resolved in the same way.

3 shows an example in which a separate air injector 30 is applied, and the air injector 30 is composed of a blower 31, a pipe 32, and a nozzle 33, and the pipe 32 is the first main It is piped inside the hopper (1-1), and the nozzle (33) is preferably along the circumferential direction on the inner wall of the first main hopper (1-1) through the pipe (32) so as not to interfere with the storage and supply of fly ash. A plurality of them are arranged and configured to inject air toward the lower discharge portion.

When the controller 10 determines that the first main hopper 1-1 is clogged, the first lower gate 3-1 is closed, the first upper gate 2-1 is controlled to be open, and the air injector ( 30) is operated to allow air to be sprayed toward the discharge part at high pressure, thereby disturbing the fly ash blocking the discharge part to eliminate the clogging.

The above-described equalizer valve 20-1 and the air injector 30 are actuators for relieving clogging.

As shown in FIG. 4, the method of detecting and eliminating automatic processing defects of the airlock valve for ash treatment facilities according to the present invention comprises the steps of detecting the operation pressure of the sub hopper-determining clogging-controlling clogging. The detailed process is as follows.

1. Feed blower pressure detection.

The pressure sensor P at the rear end of the transfer blower detects the operating pressure of the first to fourth sub-hoppers 4-1,4-2,4-3,4-4, respectively.

2. Determination of blockage.

Clogging can be determined using a continuous pressure graph of the 1st to 4th sub-hoppers (4-1,4-2,4-3,4-4), and by using the difference between the maximum and minimum pressure values. .

end. Clogging determination using relative comparison of sub-hopper operating pressure.

The pressure sensor (P) at the rear end of the transfer blower senses the operating pressure of each of the first to fourth sub-hoppers (4-1,4-2,4-3,4-4), and the controller 10 rises and falls. The following one cycle can be used as the standard for the normal cycle, and the main hopper with clogging is determined by checking the part of the pressure sensor (P) at the rear end of the conveying blower where the rise and fall are not continuous.

For example, FIG. 5 is a graph showing the result of pressure detection, and (A) on the left is the same for all of the first to fourth sub-hoppers (4-1,4-2,4-3,4-4) Is a graph detected as a similar pressure, and (B) on the right shows that the pressure of the third sub-hopper (4-3) is different from that of the remaining sub-hoppers (4-1,4-2,4-4). It is a graph detected as.

During the storage of fly ash, during discharge and re-storing, a pressure change in one cycle of repeated increase and decrease of pressure is observed. Conversely, in the case of poor treatment due to clogging, there is almost no pressure increase.

That is, in the graph (B) on the right side of FIG. 5, it is possible to determine a processing defect (clogging) of the third main hopper 1-3, which is the third when viewed as two normal cycles-no pressure change-one normal cycle.

I. Blockage determination using the difference between the highest and lowest values.

To this end, a reference value for the difference between the maximum value and the minimum value is set in advance, and the reference value and the current difference value are compared.

For example, in the case of a normal cycle, when the pressure difference is “8 to 10”, the third in the graph of FIG. 5 (B) is judged as clogging because the pressure difference is close to “0” and does not satisfy the reference value. .

3. Clog relief control.

The clogging is eliminated based on the result determined in the previous process, and the opening of the third upper gate (2-3) and the third lower gate (in order to eliminate the clogging of the corresponding main hopper, that is, the third main hopper (1-3)) are controlled. 3-3) is controlled to be closed and the third equalizer valve (20-3) is controlled to open so that the conveyed air passes through the blockage of the third main hopper (1-3) to eliminate the blockage, or the third upper gate ( 2-3) and the third lower gate (3-3) are controlled to open and close by controlling the injection of the air injector 30 to eliminate clogging.

1-1,1-2,1-3,1-4: 1st to 4th main hopper,
2-1,2-2,2-3,2-4: first to fourth upper gates,
3-1,3-2,3-3,3-4: first to fourth lower gates,
4-1,4-2,4-3,4-4: first to fourth sub-hoppers,
10: controller,
20-1,20-2,20-3,20-4: first to fourth equalizer valves,
30: air injector,
20: conveying blower,
P: Pressure sensor at the rear end of the conveying fan,
CIA: Rotation transfer piping

Claims (5)

A pressure sensor for sensing pressures of sub-hoppers configured in two or more airlock valves connected in series;
A controller for determining clogging of the main hopper connected to the upper portion of the sub-hopper based on the detected value of the pressure sensor and controlling clogging,
The controller controls the opening and closing of the upper gate for opening and closing the discharge part of the main hopper and the lower gate of the sub hopper, and controlling driving of an actuator for removing clogging by forcibly injecting air to the main hopper. A system for detecting and eliminating automatic processing defects of airlock valves for ash treatment facilities. The method according to claim 1, wherein the actuator is a transfer blower that injects air into the sub hopper and helps to discharge the fly ash stored in the sub hopper. system. The method of claim 1, wherein the actuator is an air injector that is piped inside the main hopper and receives external air and injects it toward the discharge part of the main hopper. And relieving system. A first step of sensing pressures of sub-hoppers configured in two or more airlock valves connected in series;
A second step of determining clogging of a main hopper connected to an upper portion of the sub hopper based on the pressures of the sub hoppers sensed through the first step;
In order to eliminate the clogging of the main hopper determined as clogging through the second step, air is supplied to the main hopper in a state in which the upper gate opening and closing the discharge part of the main hopper is opened and controlled while the lower gate of the sub hopper is closed. A method for detecting and eliminating automatic processing defects of an airlock valve for ash treatment facilities, characterized in that it comprises a third step of forcibly spraying to eliminate clogging. The method according to claim 4, wherein in the second step, the main hopper having a difference in pressure change is determined as clogged by comparing pressures of the sub-hoppers, or the current value is determined by comparing the current value with the reference value of the difference between the maximum and minimum values. A method of detecting and solving a defect in automatic treatment of an airlock valve for an ash treatment facility, characterized in that it is determined as clogging when the range of the reference value is not satisfied.

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