Method and equipment for controlling multiple reclaimers of thermal power plant

Abstract

The invention discloses a method and equipment for controlling multiple reclaimers in a thermal power plant, and the method comprises the steps: arranging an airborne PLC system at each reclaimer, and transmitting the position information of each reclaimer to a PLC programmed control system of a coal conveying centralized control center through the airborne PLC system; the PLC programmed control system determines the conveying time of conveying the coal to the hopper bin of each material taking machine according to the position information of each material taking machine; fire coal reclaiming plan information is determined on the basis of the conveying time of coal conveyed to a hopper bin by each reclaimer, and the fire coal reclaiming plan information is sent to each airborne PLC system; each airborne PLC system controls each material taking machine to execute material taking operation based on the fire coal material taking plan information, and the time for coal materials of each material taking machine to reach a hopper bin is consistent, so that the material taking machines are coordinated and matched, the material taking speed of each material taking machine is automatically and accurately adjusted, and the material taking efficiency is improved. And the situation that the blending combustion proportion is unstable due to inconsistent distances of the coal materials of all the reclaimers is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of thermal power plant automation, and more specifically, to a method and device for controlling a multi-reclaimer in a thermal power plant. Background Art

[0002] In recent years, as coal prices continue to rise, the power generation costs of thermal power plants across the country have increased significantly, and huge losses have occurred in the year-end settlement. However, the supply of electricity is related to the national economy and people's livelihood. Even if there is a loss, power generation must be carried out. This is a major national event. At present, the main method that can greatly reduce losses or even make a slight profit is "blending high and low calorific value coal", because according to the needs of power generation load, a certain proportion of high-priced high-calorific value coal and low-priced low-calorific value coal are mixed and burned, which ensures the continuous and stable power generation of the unit and greatly reduces production costs. For this reason, thermal power plants all adopt the blending method as the main operating mode, store each coal yard according to the coal quality, use the stackers and reclaimers of each yard to coordinate with each other, and take coal and blend it according to different proportions according to the power generation load.

[0003] The problem that has arisen in reality is that it is impossible to ensure that the stacker-reclaimer always accurately takes coal and blends it according to the specified ratio. Reasons: 1. The different storage locations of coal in each yard cause time differences in the coal transmission distance of the stacker-reclaimer, and finally a blank section of a single type of coal appears when mixing at the convergence point; 2. Due to a stacker-reclaimer failure or other reasons, a certain machine stops operating, and the human operation is not timely, allowing another machine to continue to operate, and finally a blank section of a single type of coal appears when mixing at the convergence point; 3. During the coal-taking operation, due to landslides, the corners of the coal pile, and the reduced coal storage space in the coal hopper, the stacker-reclaimer cannot meet the specified requirements in terms of coal taking, resulting in an imbalance in the blending ratio. These reasons have been plaguing various thermal power plants.

[0004] Therefore, how to achieve automatic adjustment of multiple reclaimers to avoid unstable blending ratio of coal materials of each reclaimer due to inconsistent distances is a technical problem that needs to be solved. Summary of the invention

[0005] The present invention provides a control method for multiple reclaimers in a thermal power plant, which is used to solve the technical problems in the prior art that the reclaimers cannot cooperate with each other, the automatic adjustment ability is poor, and the blending ratio of the coal materials of each reclaimer is unstable due to the inconsistent distance. The method comprises:

[0006] An onboard PLC system is installed on each reclaimer, and the position information of each reclaimer is sent to the PLC program control system of the coal handling centralized control center through the onboard PLC system;

[0007] The PLC program control system determines the delivery time of coal from each reclaimer to the hopper bin through the position information of each reclaimer;

[0008] Determine the coal reclaiming plan information based on the coal delivery time of each reclaimer to the hopper bin, and send the coal reclaiming plan information to each onboard PLC system, wherein the coal reclaiming plan information specifically adjusts the frequency speed of the conveyor belt inverter corresponding to each reclaimer or adjusts the reclaiming time of each reclaimer;

[0009] Each onboard PLC system controls each reclaimer to perform a reclaiming operation based on the coal reclaiming plan information, and makes the coal of each reclaimer arrive at the hopper bin at the same time.

[0010] In some embodiments of the present application, when the coal reclaiming plan information is specifically to adjust the frequency speed of the conveyor belt inverter corresponding to each reclaimer, each onboard PLC system controls each reclaimer to perform the reclaiming operation based on the coal reclaiming plan information, specifically:

[0011] Determine the target frequency speed of the conveyor belt inverter corresponding to each reclaimer based on the conveying time of the coal from each reclaimer to the hopper bin;

[0012] Each target frequency speed is sent to the corresponding onboard PLC system of the reclaimer through the PLC program control system, and the frequency speed of the conveyor belt inverter of the reclaimer is adjusted to the target frequency speed through the onboard PLC system, and the bucket wheel coal taking speed of the reclaimer is adjusted according to the target frequency speed.

[0013] In some embodiments of the present application, when the coal reclaiming plan information is specifically to adjust the reclaiming time of each reclaimer, each onboard PLC system controls each reclaimer to perform a reclaiming operation based on the coal reclaiming plan information, specifically:

[0014] Set the frequency speed of the conveyor belt inverter of each reclaimer to the same frequency speed, and set the reclaimer with the longest conveying time of coal to the hopper bin as the main reclaimer, and the other reclaimers as slave reclaimers;

[0015] When the material taking operation is in progress, the main reclaimer is first used for taking materials, and then each slave reclaimer is used for taking materials in turn, and the coal is gathered in the hopper bin at the same time. According to the frequency speed of the conveyor belt inverter of each reclaimer and the position information of each reclaimer, the time T0 when the coal of the main reclaimer arrives at the hopper bin is calculated, and the time when the coal of each slave reclaimer arrives at the hopper bin is calculated in turn as T1, T2, T3 to TN and TN+1;

[0016] Calculate the time difference between each slave reclaimer and the master reclaimer, which are T01, T02, T03 to TN+1;

[0017] The PLC program control system sends a material retrieving command to the main retrieving machine, and the main retrieving machine starts to retrieving materials. After the gap time T01, the first slave retrieving machine starts to retrieving materials. After T02, the second slave retrieving machine starts to retrieving materials until all slave retrieving machines have completed retrieving materials.

[0018] In some embodiments of the present application, the method further includes:

[0019] When any reclaimer fails, the PLC system of the failed reclaimer sends a fault signal to the PLC program control system, and after receiving the fault signal, the PLC program control system sends a stop signal to other reclaimers and conveyor belts;

[0020] When a non-reclaimer failure occurs, the PLC program control system sends a shutdown signal to all equipment in the coal yard control system of the thermal power plant, waiting for comprehensive maintenance.

[0021] In some embodiments of the present application, the method further includes:

[0022] Each onboard PLC system controls the onboard cantilever belt of each reclaimer to have a belt speed slower than the belt speed of the corresponding conveyor belt when reclaiming coal, and a limiting flow plate and a vibration motor are installed on the cantilever belt.

[0023] In some embodiments of the present application, the method further includes:

[0024] When at least two reclaimers share a conveyor belt, the coal can reach the hopper bin at the same time by adjusting the coal taking speed of the bucket wheels of each reclaimer.

[0025] In some embodiments of the present application, the method further includes:

[0026] After the PLC program control system receives the coal blending and combustion plan information, it generates the optimal position information of each reclaimer based on the coal blending and combustion plan information and the position information of each reclaimer, and sends the optimal position information to the user.

[0027] In some embodiments of the present application, the method further includes:

[0028] When the coal blending and burning operation is being carried out, the coal blending and burning plan information is sent to each onboard PLC system, and each reclaimer and the corresponding conveyor belt are started in sequence according to the coal blending and burning plan information.

[0029] In some embodiments of the present application, the method further includes:

[0030] Each reclaimer is provided with a coal level meter, through which the coal consumption situation in each reclaimer is sent to the PLC program control system in real time;

[0031] The PLC program control system determines whether the remaining coal quantity of each reclaimer is lower than the warning value according to the total coal quantity and coal consumption of each reclaimer, and sends a coal replenishment signal to the user when it is lower than the warning value;

[0032] When the coal consumption of any reclaimer does not change within the preset time, the reclaimer is identified as a faulty reclaimer and a fault signal is sent to the PLC control system.

[0033] Accordingly, the present invention also proposes a multi-reclaimer control device for a thermal power plant, which is applied to a coal yard control system of a thermal power plant including multiple reclaimers and a coal transportation centralized control center, and the device comprises:

[0034] The first sending module is used to set an onboard PLC system on each reclaimer, and send the position information of each reclaimer to the PLC program control system of the coal handling centralized control center through the onboard PLC system;

[0035] A determination module, used for the PLC program control system to determine the delivery time of coal from each reclaimer to the hopper bin through the position information of each reclaimer;

[0036] The second sending module is used to determine the coal reclaiming plan information based on the conveying time of the coal of each reclaimer to the hopper bin, and send the coal reclaiming plan information to each onboard PLC system, wherein the coal reclaiming plan information specifically adjusts the frequency speed of the conveyor belt inverter corresponding to each reclaimer or adjusts the reclaiming time of each reclaimer;

[0037] The execution module is used for each onboard PLC system to control each reclaimer to perform the reclaiming operation based on the coal reclaiming plan information, and to make the time for the coal of each reclaimer to arrive at the hopper bin consistent.

[0038] By applying the above technical scheme, a control method and equipment for multiple reclaimers in a thermal power plant are proposed, the method comprising: setting an airborne PLC system in each reclaimer, and sending the position information of each reclaimer to the PLC program control system of the coal transportation control center through the airborne PLC system; the PLC program control system determines the conveying time of the coal of each reclaimer to the hopper bin through the position information of each reclaimer; based on the conveying time of the coal of each reclaimer to the hopper bin, the coal reclaiming plan information is determined, and the coal reclaiming plan information is sent to each airborne PLC system, the coal reclaiming plan information specifically adjusts the frequency speed of the conveyor belt inverter corresponding to each reclaimer or adjusts the reclaiming time of each reclaimer; each airborne PLC system controls each reclaimer to perform the reclaiming operation based on the coal reclaiming plan information, and makes the time for the coal of each reclaimer to arrive at the hopper bin consistent, so as to achieve coordination between the reclaimers, automatically and accurately adjust the reclaiming speed of each reclaimer, and avoid the unstable blending ratio of the coal of each reclaimer due to inconsistent distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A schematic flow chart of a method for controlling a multi-reclaimer in a thermal power plant according to an embodiment of the present invention is shown;

[0041] Figure 2 The schematic diagram of the structure of a multi-reclaimer control device for a thermal power plant proposed in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] The present application embodiment proposes a method for controlling multiple reclaimers in a thermal power plant, such as Figure 1 As shown, the method is applied to a coal yard control system of a thermal power plant including multiple reclaimers and a coal handling centralized control center, and the method includes the following steps:

[0044] Step S101, an onboard PLC system is set on each reclaimer, and the position information of each reclaimer is sent to the PLC program control system of the coal transportation centralized control center through the onboard PLC system.

[0045] In this embodiment, each reclaimer is provided with an onboard PLC system, and data is exchanged with the PLC program control system of the coal transportation control center through the onboard PLC system of each reclaimer. The PLC program control system determines the current working status according to the data transmitted by each onboard PLC system, and sends control instructions to each onboard PLC system in time, so as to realize automatic control and mutual coordination of multiple reclaimers in the thermal power plant.

[0046] In this embodiment, sensors or data acquisition devices can also be set in each material reclaimer, and connected to the airborne PLC system, so as to timely transmit the working information of each material reclaimer collected by the sensor to the airborne PLC system of the material reclaimer, and then upload it to the PLC program control system by the airborne PLC system, so as to realize real-time collection of on-site data and feedback to the coal transportation control center, so as to facilitate the monitoring of the use of each stacker and reclaimer, each conveyor belt, its speed, flow, position, distance difference, motor frequency conversion frequency, motor power, current, voltage, communication reception frequency, etc.

[0047] Step S102, the PLC program control system determines the delivery time of coal from each reclaimer to the hopper bin through the position information of each reclaimer.

[0048] In this embodiment, the position information of each feeder is sent to the PLC program control system through each airborne PLC system or airborne radar and other inductive communication devices. The PLC program control system determines the time required for the coal of each feeder to be transferred to the hopper bin based on the position information of each feeder. The specific confirmation process is: the distance between each feeder and the hopper bin can be obtained based on the position information, the coal is transferred to the hopper bin through the conveyor belt, and the frequency speed of the conveyor belt inverter is sent to the PLC program control system through the airborne PLC system. A speed detection device can also be set at the conveyor belt position and sent to the PLC program control system through the detection device. The PLC program control system can obtain the transportation time of the coal of each feeder to the hopper bin based on the frequency speed of the conveyor belt inverter and the corresponding distance.

[0049] Step S103, based on the coal transportation time of each reclaimer to the hopper bin, determine the coal reclaiming plan information, and send the coal reclaiming plan information to each airborne PLC system. The coal reclaiming plan information specifically adjusts the frequency speed of the conveyor belt inverter corresponding to each reclaimer or adjusts the reclaiming time of each reclaimer.

[0050] In this embodiment, the coal feeding plan information is specifically the adjustment measures generated by the PLC program control system according to the transportation time of the coal from each feeder to the hopper bin. The adjustment measures ensure that the coal transported by each feeder can reach the hopper bin at the same time to ensure that the blending ratio meets the requirements. After the PLC program control system generates the coal feeding plan information according to the transportation time of the coal from each feeder to the hopper bin, the coal feeding plan information is sent to each airborne PLC system, and each airborne PLC system adjusts the working parameters of the feeder according to the coal feeding plan information.

[0051] In this embodiment, the coal feeding plan information can be to adjust the frequency speed of the conveyor belt inverter corresponding to each feeder or to adjust the feeding time of each feeder. In order to meet the actual needs of the power plant, the frequency speed of the conveyor belt inverter corresponding to each feeder can be adjusted to ensure that the coal of each feeder can reach the hopper bin at the same time. The feeding time of each feeder can also be adjusted, that is, the feeder farthest from the hopper bin will first feed the material, and the materials will be fed in sequence according to the distance between the feeders, rather than at the same time. In this case, it is necessary to ensure that the belt transmission speed is consistent.

[0052] In order to ensure that the coal conveying time of each reclaimer is consistent to the hopper bin by adjusting the reclaiming time of each reclaimer, in some embodiments of the present application, when the coal reclaiming plan information is specifically to adjust the frequency speed of the conveyor belt inverter corresponding to each reclaimer, each onboard PLC system controls each reclaimer to perform the reclaiming operation based on the coal reclaiming plan information, specifically:

[0053] Determine the target frequency speed of the conveyor belt inverter corresponding to each reclaimer based on the conveying time of the coal from each reclaimer to the hopper bin;

[0054] Each target frequency speed is sent to the corresponding onboard PLC system of the reclaimer through the PLC program control system, and the frequency speed of the conveyor belt inverter of the reclaimer is adjusted to the target frequency speed through the onboard PLC system, and the bucket wheel coal taking speed of the reclaimer is adjusted according to the target frequency speed.

[0055] In this embodiment, when the frequency speed of the conveyor belt inverter corresponding to each reclaimer is adjusted to achieve the same time for the coal of each reclaimer to arrive at the hopper bin, the target frequency speed of the conveyor belt inverter corresponding to each reclaimer is first determined according to the transportation time of the coal of each reclaimer to the hopper bin and the distance from the hopper bin, and each target frequency speed is sent to the onboard PLC system of the corresponding reclaimer through the PLC program control system, and the frequency speed of the conveyor belt inverter is adjusted to the target frequency speed through the onboard PLC system. At the same time, in order to avoid coal overflow or coal blockage, it is also necessary to adjust the bucket wheel coal taking speed of the reclaimer according to the target frequency speed.

[0056] In order to ensure that the coal conveying time of each reclaimer is consistent to the hopper bin by adjusting the reclaiming time of each reclaimer, in some embodiments of the present application, when the coal reclaiming plan information is specifically to adjust the reclaiming time of each reclaimer, each onboard PLC system controls each reclaimer to perform the reclaiming operation based on the coal reclaiming plan information, specifically:

[0057] Set the frequency speed of the conveyor belt inverter of each reclaimer to the same frequency speed, and set the reclaimer with the longest conveying time of coal to the hopper bin as the main reclaimer, and the other reclaimers as slave reclaimers;

[0058] When the material taking operation is in progress, the main reclaimer is first used for taking materials, and then each slave reclaimer is used for taking materials in turn, and the coal is gathered in the hopper bin at the same time. According to the frequency speed of the conveyor belt inverter of each reclaimer and the position information of each reclaimer, the time T0 when the coal of the main reclaimer arrives at the hopper bin is calculated, and the time when the coal of each slave reclaimer arrives at the hopper bin is calculated in turn as T1, T2, T3 to TN and TN+1;

[0059] Calculate the time difference between each slave reclaimer and the master reclaimer, which are T01, T02, T03 to TN+1;

[0060] The PLC program control system sends a material retrieving command to the main retrieving machine, and the main retrieving machine starts to retrieving materials. After the gap time T01, the first slave retrieving machine starts to retrieving materials. After T02, the second slave retrieving machine starts to retrieving materials until all slave retrieving machines have completed retrieving materials.

[0061] In this embodiment, the speed of the belt conveyor is set to the same speed, and the feeding time of each feeder is staggered to achieve the consistency of the coal transportation time of each feeder to the hopper bin. The specific process is: the feeder with the longest transportation time for conveying coal to the hopper bin, that is, the feeder farthest from the hopper bin, is set as the main feeder, and the other feeders are set as slave feeders. When feeding, the main feeder is first fed, and then the slave feeders are fed in turn, so that the coal is gathered in the hopper bin at the same time. According to the frequency speed of the conveyor belt inverter of each reclaimer and the position information of each reclaimer, the time T0 when the coal of the main reclaimer arrives at the hopper bin is calculated, and the time when the coal of each slave reclaimer arrives at the hopper bin is calculated in sequence as T1, T2, T3 to TN and TN+1, and the difference time between each slave reclaimer and the main reclaimer is calculated as T01, T02, T03 to TN+1 respectively. The PLC program control system sends a reclaiming command to the main reclaimer, and the main reclaimer starts to reclaim, and after the difference time T01, the first slave reclaimer starts to reclaim, and after T02, the second slave reclaimer starts to reclaim, until all slave reclaimers have completed reclaiming. In this way, the conveyor belt speed can be kept consistent, and the reclaiming is carried out in sequence according to the length of the position of each reclaimer.

[0062] In order to ensure the safety of the material taking process, in some embodiments of the present application, the method further includes:

[0063] When any reclaimer fails, the PLC system of the failed reclaimer sends a fault signal to the PLC program control system, and after receiving the fault signal, the PLC program control system sends a stop signal to other reclaimers and conveyor belts;

[0064] When a non-reclaimer failure occurs, the PLC program control system sends a shutdown signal to all equipment in the coal yard control system of the thermal power plant, waiting for comprehensive maintenance.

[0065] When any reclaimer fails, the onboard PLC system of the faulty reclaimer will promptly send a fault signal to the PLC program control system. After receiving the fault signal, it will send a shutdown signal to other reclaimers and conveyor belts. In addition to the reclaimer failure, there may be other equipment failures in the coal yard control system of the thermal power plant. These non-reclaimer failures generally cause safety risks in the entire reclaiming process. Therefore, it is necessary to send a shutdown signal to all equipment in the coal yard control system of the thermal power plant, waiting for a comprehensive overhaul. For example, when the coal taken by each stacker and reclaimer is gathered at a designated location for blending, and various accidents that affect the normal operation of the system occur, such as the subsequent shutdown of the blending and storage conveyor belt, the fault system sends a fault shutdown signal to the PLC program control system of the coal transportation control center in real time. The PLC program control system also sends a shutdown command to each operating stacker and reclaimer, conveyor belt conveyor and other equipment.

[0066] In order to ensure the normal progress of material collection, in some embodiments of the present application, the method further includes:

[0067] Each onboard PLC system controls the onboard cantilever belt of each reclaimer to have a belt speed slower than the belt speed of the corresponding conveyor belt when reclaiming coal, and a limiting flow plate and a vibration motor are installed on the cantilever belt.

[0068] In this embodiment, considering that the coal types and qualities taken by each stacker and reclaimer are different, it is very easy for the hopper, cantilever belt, buffer bin to stick coal in many places, and the transmission is blocked and overloaded. The solution is to always adjust the onboard PLC program control system to ensure that the speed of the onboard cantilever belt is slower than the speed of the corresponding conveyor belt when taking coal, and to install a flow limiting plate on the cantilever belt to prevent the cantilever belt from blocking the coal at a low speed and the bucket wheel at a constant speed, and to cut the peak in time, and to install a vibration motor at each place where coal is easily stuck and accumulated to perform vibration coal removal.

[0069] In order to ensure that two reclaimers can reclaim materials normally when they share a conveyor belt, in some embodiments of the present application, the method further includes:

[0070] When at least two reclaimers share a conveyor belt, the coal can reach the hopper bin at the same time by adjusting the coal taking speed of the bucket wheels of each reclaimer.

[0071] In order to further improve the efficiency of the blending process, in some embodiments of the present application, the method further includes:

[0072] After the PLC program control system receives the coal blending and combustion plan information, it generates the optimal position information of each reclaimer based on the coal blending and combustion plan information and the position information of each reclaimer, and sends the optimal position information to the user.

[0073] After the coal blending and combustion plan information of the thermal power plant is transmitted to the PLC program control system, the coal blending and combustion plan information and the position information of each reclaimer can simulate the working conditions of each reclaimer, calculate the optimal position information of each reclaimer, and send the optimal position information to the user to guide the user to adjust the position of the reclaimer, thereby further improving the coal blending efficiency.

[0074] In order to ensure the normal blending of coal and combustion, in some embodiments of the present application, the method further includes:

[0075] When the coal blending and burning operation is being carried out, the coal blending and burning plan information is sent to each onboard PLC system, and each reclaimer and the corresponding conveyor belt are started in sequence according to the coal blending and burning plan information.

[0076] In order to further ensure the normal operation of the reclaimer, in some embodiments of the present application, the method further includes:

[0077] Each reclaimer is provided with a coal level meter, through which the coal consumption situation in each reclaimer is sent to the PLC program control system in real time;

[0078] The PLC program control system determines whether the remaining coal quantity of each reclaimer is lower than the warning value according to the total coal quantity and coal consumption of each reclaimer, and sends a coal replenishment signal to the user when it is lower than the warning value;

[0079] When the coal consumption of any reclaimer does not change within the preset time, the reclaimer is identified as a faulty reclaimer and a fault signal is sent to the PLC control system.

[0080] In this embodiment, a coal level meter is provided in each reclaimer to monitor the coal quantity of each reclaimer in real time to avoid insufficient coal. When the remaining coal quantity is lower than the warning value, a coal replenishment signal is sent to the user. If the coal quantity does not change within a preset time, the reclaimer is identified as a faulty reclaimer and a fault signal is sent to the PLC program control system.

[0081] Step S104, each onboard PLC system controls each reclaimer to perform a reclaiming operation based on the coal reclaiming plan information, and makes the time for the coal of each reclaimer to arrive at the hopper bin consistent.

[0082] By applying the above technical scheme, a control method and equipment for multiple reclaimers in a thermal power plant are proposed, the method comprising: setting an airborne PLC system in each reclaimer, and sending the position information of each reclaimer to the PLC program control system of the coal transportation control center through the airborne PLC system; the PLC program control system determines the conveying time of the coal of each reclaimer to the hopper bin through the position information of each reclaimer; based on the conveying time of the coal of each reclaimer to the hopper bin, the coal reclaiming plan information is determined, and the coal reclaiming plan information is sent to each airborne PLC system, the coal reclaiming plan information specifically adjusts the frequency speed of the conveyor belt inverter corresponding to each reclaimer or adjusts the reclaiming time of each reclaimer; each airborne PLC system controls each reclaimer to perform the reclaiming operation based on the coal reclaiming plan information, and makes the time for the coal of each reclaimer to arrive at the hopper bin consistent, so as to achieve coordination between the reclaimers, automatically and accurately adjust the reclaiming speed of each reclaimer, and avoid the unstable blending ratio of the coal of each reclaimer due to inconsistent distance.

[0083] The present application also proposes a multi-reclaimer control device for a thermal power plant, such as Figure 2 As shown, the device includes:

[0084] The first sending module 10 is used to set an onboard PLC system on each reclaimer, and send the position information of each reclaimer to the PLC program control system of the coal handling centralized control center through the onboard PLC system;

[0085] The determination module 20 is used for the PLC program control system to determine the delivery time of the coal of each reclaimer to the hopper bin through the position information of each reclaimer;

[0086] The second sending module 30 is used to determine the coal reclaiming plan information based on the conveying time of the coal of each reclaimer to the hopper bin, and send the coal reclaiming plan information to each onboard PLC system, wherein the coal reclaiming plan information specifically adjusts the frequency speed of the conveyor belt inverter corresponding to each reclaimer or adjusts the reclaiming time of each reclaimer;

[0087] The execution module 40 is used for each onboard PLC system to control each reclaimer to perform the reclaiming operation based on the coal reclaiming plan information, and to make the time for the coal of each reclaimer to arrive at the hopper bin consistent.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for controlling a multi-reclaimer in a thermal power plant, characterized in that: The method is applied to a coal yard control system of a thermal power plant including a plurality of reclaimers and a coal handling centralized control center, and the method comprises: An onboard PLC system is installed on each reclaimer, and the position information of each reclaimer is sent to the PLC program control system of the coal handling centralized control center through the onboard PLC system; The PLC program control system determines the delivery time of coal from each reclaimer to the hopper bin through the position information of each reclaimer; Determine the coal reclaiming plan information based on the coal delivery time of each reclaimer to the hopper bin, and send the coal reclaiming plan information to each onboard PLC system, wherein the coal reclaiming plan information specifically adjusts the frequency speed of the conveyor belt inverter corresponding to each reclaimer or adjusts the reclaiming time of each reclaimer; Each onboard PLC system controls each reclaimer to perform a reclaiming operation based on the coal reclaiming plan information, and makes the coal of each reclaimer arrive at the hopper bin at the same time.

2. The method according to claim 1, characterized in that When the coal reclaiming plan information specifically adjusts the frequency speed of the conveyor belt inverter corresponding to each reclaimer, each onboard PLC system controls each reclaimer to perform the reclaiming operation based on the coal reclaiming plan information, specifically: Determine the target frequency speed of the conveyor belt inverter corresponding to each reclaimer based on the conveying time of the coal from each reclaimer to the hopper bin; Each target frequency speed is sent to the corresponding onboard PLC system of the reclaimer through the PLC program control system, and the frequency speed of the conveyor belt inverter of the reclaimer is adjusted to the target frequency speed through the onboard PLC system, and the bucket wheel coal taking speed of the reclaimer is adjusted according to the target frequency speed.

3. The method according to claim 1, characterized in that When the coal reclaiming plan information is specifically to adjust the reclaiming time of each reclaimer, each onboard PLC system controls each reclaimer to perform a reclaiming operation based on the coal reclaiming plan information, specifically: Set the frequency speed of the conveyor belt inverter of each reclaimer to the same frequency speed, and set the reclaimer with the longest conveying time of coal to the hopper bin as the main reclaimer, and the other reclaimers as slave reclaimers; When the material taking operation is in progress, the main reclaimer is first used for taking materials, and then each slave reclaimer is used for taking materials in turn, and the coal is gathered in the hopper bin at the same time. According to the frequency speed of the conveyor belt inverter of each reclaimer and the position information of each reclaimer, the time T0 when the coal of the main reclaimer arrives at the hopper bin is calculated, and the time when the coal of each slave reclaimer arrives at the hopper bin is calculated in turn as T1, T2, T3 to TN and TN+1; Calculate the time difference between each slave reclaimer and the master reclaimer, which are T01, T02, T03 to TN+1; The PLC program control system sends a material retrieving command to the main retrieving machine, and the main retrieving machine starts to retrieving materials. After the gap time T01, the first slave retrieving machine starts to retrieving materials. After T02, the second slave retrieving machine starts to retrieving materials until all slave retrieving machines have completed retrieving materials.

4. The method according to claim 1, characterized in that The method further comprises: When any reclaimer fails, the PLC system of the failed reclaimer sends a fault signal to the PLC program control system, and after receiving the fault signal, the PLC program control system sends a stop signal to other reclaimers and conveyor belts; When a non-reclaimer failure occurs, the PLC program control system sends a shutdown signal to all equipment in the coal yard control system of the thermal power plant, waiting for comprehensive maintenance.

5. The method according to claim 1, characterized in that The method further comprises: Each onboard PLC system controls the onboard cantilever belt of each reclaimer to have a belt speed slower than the belt speed of the corresponding conveyor belt when reclaiming coal, and a limiting flow plate and a vibration motor are installed on the cantilever belt.

6. The method according to claim 1, characterized in that The method further comprises: When at least two reclaimers share a conveyor belt, the coal can reach the hopper bin at the same time by adjusting the coal taking speed of the bucket wheels of each reclaimer.

7. The method according to claim 1, characterized in that The method further comprises: After the PLC program control system receives the coal blending and combustion plan information, it generates the optimal position information of each reclaimer based on the coal blending and combustion plan information and the position information of each reclaimer, and sends the optimal position information to the user.

8. The method according to claim 7, characterized in that The method further comprises: When the coal blending and burning operation is being carried out, the coal blending and burning plan information is sent to each onboard PLC system, and each reclaimer and the corresponding conveyor belt are started in sequence according to the coal blending and burning plan information.

9. The method according to claim 1, characterized in that The method further comprises: Each reclaimer is provided with a coal level meter, through which the coal consumption situation in each reclaimer is sent to the PLC program control system in real time; The PLC program control system determines whether the remaining coal quantity of each reclaimer is lower than the warning value according to the total coal quantity and coal consumption of each reclaimer, and sends a coal replenishment signal to the user when it is lower than the warning value; When the coal consumption of any reclaimer does not change within the preset time, the reclaimer is identified as a faulty reclaimer and a fault signal is sent to the PLC control system.

10. A multi-reclaimer control device for a thermal power plant, characterized in that: The device is applied to a coal yard control system of a thermal power plant including multiple reclaimers and a coal handling centralized control center, and the device includes: The first sending module is used to set an onboard PLC system on each reclaimer, and send the position information of each reclaimer to the PLC program control system of the coal handling centralized control center through the onboard PLC system; A determination module, used for the PLC program control system to determine the delivery time of coal from each reclaimer to the hopper bin through the position information of each reclaimer; The second sending module is used to determine the coal reclaiming plan information based on the conveying time of the coal of each reclaimer to the hopper bin, and send the coal reclaiming plan information to each onboard PLC system, wherein the coal reclaiming plan information specifically adjusts the frequency speed of the conveyor belt inverter corresponding to each reclaimer or adjusts the reclaiming time of each reclaimer; The execution module is used for each onboard PLC system to control each reclaimer to perform the reclaiming operation based on the coal reclaiming plan information, and to make the time for the coal of each reclaimer to arrive at the hopper bin consistent.

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