Automatic control system and control method for sludge co-combustion in thermal power plant

Abstract

The application discloses an automatic control system for sludge blending combustion in a thermal power plant and a control method thereof. The system comprises a main control module, a sludge module for storing and transporting sludge, a coal conveying module for transporting a coal sample and a coal storage module for storing raw coal. The sludge module comprises a sludge storage bin and a sludge conveying device, and further comprises a plurality of pipelines and valves for connection. The coal conveying module comprises coal conveying belts, each of which is provided with a belt running sensor and a weighing sensor. The coal storage module comprises a plurality of raw coal bins, each of which is provided with a material level sensor. A coal plough is arranged between the raw coal bin and the coal conveying belt. The main control module is in communication connection with the sludge module, the coal conveying module and the coal storage module. The main control module is used for receiving signals from the sludge module, the coal conveying module and the coal storage module, and sending corresponding control signals to realize unmanned automatic control of sludge blending combustion. The application can realize unmanned operation in the process of sludge blending combustion in the thermal power plant.

Description

Technical Field

[0001] This invention relates to the field of sludge co-firing technology in thermal power plants, and in particular to an automatic control system and control method for sludge co-firing in thermal power plants. Background Technology

[0002] With urban development, the production of municipal sludge is enormous, leading to sludge silt accumulation in many cities. As environmental policies become increasingly sophisticated, the requirements for the harmless, reduced-volume, and resource-based treatment of sludge are becoming more stringent. Co-incineration of sludge in thermal power plants has become a mature and efficient technological approach. This primarily involves using existing high-temperature boilers in thermal power plants to thoroughly incinerate the sludge at high temperatures, and then utilizing the plant's advanced environmental protection facilities to ensure that the exhaust gases meet emission standards. Currently, there are two main types of co-incineration technologies for sludge in thermal power plants: direct co-incineration of sludge and direct co-incineration after drying and dewatering the sludge.

[0003] However, existing sludge co-firing projects in thermal power plants are currently focused on increasing the number of operation and maintenance personnel. These personnel need to assess the coal conveying system's operation to control the sludge system's startup and shutdown and adjust equipment output. This approach increases the workload of maintenance personnel, and the frequent adjustments to the sludge system based on the coal conveying system increase the risk of human error. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing thermal power plant sludge co-firing projects, which rely heavily on operation and maintenance personnel and are subject to the risk of human error. This invention provides an automatic control system and control method for thermal power plant sludge co-firing, which achieves the effect of automatically controlling the overall process of thermal power plant sludge co-firing through the main control module by setting up a sludge module, a coal conveying module, and a coal storage module that are respectively connected to the main control module, thereby eliminating the need for operation and maintenance personnel to operate and monitor the process.

[0005] The present invention provides an automatic control system for co-firing sludge in thermal power plants, including a main control module, a sludge module for storing and transporting sludge, a coal conveying module for transporting coal samples, and a coal storage module for storing raw coal. The sludge module includes a sludge storage bin and a sludge conveying device, and also includes multiple pipes and valves for connection. The coal conveying module includes a coal conveying belt, each of which is equipped with a belt running sensor and a weighing sensor. The coal storage module includes multiple raw coal bins, each of which is equipped with a material level sensor. A coal plow is provided between the raw coal bin and the coal conveying belt. The main control module is communicatively connected to the sludge module, the coal conveying module, and the coal storage module. The main control module is used to receive signals from the sludge module, the coal conveying module, and the coal storage module, and to issue corresponding control signals to realize unattended automated control of sludge co-firing.

[0006] In one of the alternative technical solutions, the number of coal conveyor belts is at least two, and at least one coal plow is installed between each coal conveyor belt and the raw coal bunker.

[0007] In one of the alternative technical solutions, the main control module is used to receive belt running signals from the belt running sensor and weighing signals from the weighing sensor. The main control module can determine the operating status of the coal conveying module based on the belt running signals and the weighing signals.

[0008] In one of the alternative technical solutions, the main control module is used to receive the working status signal from the coal plow and the material level signal from the material level sensor. The main control module can control the working status of the sludge module to adjust the sludge co-firing ratio according to the working status signal and the material level signal.

[0009] The present invention provides a control method for an automatic control system for co-firing sludge in any of the aforementioned thermal power plants, comprising: The main control module obtains the belt operation signal and weighing signal collected by the coal conveying module from the coal conveying belt; The main control module acquires the material level signal from the raw coal bunker and the working status signal from the coal plow. The main control module determines whether the start-up conditions are met based on the belt running signal, weighing signal, working status signal and material level signal; If the startup conditions are met, the main control module starts the sludge module and controls the sludge conveying device to convey sludge to the coal conveyor belt. The main control module adjusts the sludge conveying rate of the sludge module based on the weighing signal.

[0010] In one of the optional technical solutions, if the start-up conditions are met, the main control module starts the sludge module and controls the sludge conveying device to convey sludge to the coal conveyor belt, specifically including: If the conditions for judgment are met simultaneously, such as the coal conveyor belt being in operation, the plow of the corresponding raw coal bunker being in the lowered state, and the material level of the raw coal bunker being lower than the preset threshold, then the start-up conditions are met. The main control module controls the sludge module to start and add sludge to the coal conveyor belt.

[0011] In one of the optional technical solutions, the main control module adjusts the sludge conveying rate of the sludge module according to the weighing signal, specifically including: Obtain the preset blending ratio of sludge and raw coal; The main control module calculates the raw coal conveying rate of the coal conveyor belt based on the weighing signal detected by the weighing sensor. The main control module adjusts the sludge conveying rate of the sludge conveying device according to the raw coal conveying rate of the coal conveying belt, so that the sludge conveying amount and the raw coal conveying amount maintain the preset blending ratio.

[0012] One of the alternative technical solutions also includes: When the weighing signal of the coal conveyor belt is lower than the preset flow threshold, the main control module controls the sludge conveying device to be in standby mode and not to convey. When the weighing signal is higher than the preset flow rate threshold, the main control module controls the sludge conveying device to convey sludge according to the preset ratio.

[0013] One of the alternative technical solutions also includes: When multiple coal conveyor belts are running simultaneously, the control module determines the total amount of sludge transported based on the weighing signals of each coal conveyor belt, and distributes the sludge proportionally to each coal conveyor belt by adjusting the valve openings on the corresponding pipelines.

[0014] The present invention provides an electronic device, including a memory, a processor, and an electronic device program on the memory, wherein the processor executes the electronic device program to implement the steps of any of the aforementioned control methods.

[0015] The above technical solution has the following beneficial effects: The automatic control system for sludge co-firing in thermal power plants provided by this invention establishes a main control module that is communicatively connected to the sludge module, coal conveying module, and coal storage module. The main control module receives in real time the belt operation signal and weighing signal of the coal conveying belt, the material level signal of the raw coal bunker, and the working status signal of the coal plow. After comprehensively judging the current coal conveying and coal storage conditions, it automatically issues start / stop commands and equipment output adjustment commands to the sludge module. This enables the sludge co-firing process to intelligently follow the original coal conveying and feeding conditions of the thermal power plant and achieve unattended automated operation. This avoids the problems of high labor intensity, slow response, and high risk of human error caused by relying on continuous manual monitoring and operation. Attached Figure Description

[0016] The disclosure of this invention will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings: Figure 1 A connection block diagram of an automatic control system for co-firing sludge in a thermal power plant provided in an embodiment of the present invention; Figure 2A schematic diagram of the structure of an automatic control system for co-firing sludge in a thermal power plant according to an embodiment of the present invention; Figure 3 A flowchart of a control method provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the mechanism of an electronic device provided in an embodiment of the present invention.

[0017] Figure reference numerals: 1. Main control module; 2. Sludge module; 21. Sludge storage bin; 22. Sludge conveying device; 23. Pipeline; 24. Valve; 3. Coal conveying module; 31. Coal conveying belt; 4. Coal storage module; 41. Raw coal bin; 42. Coal plow. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0019] In this invention, unless otherwise explicitly specified and limited, the term "fixed" and similar terms should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] The technical solutions provided in the various embodiments of this specification are described in detail below with reference to the accompanying drawings.

[0021] In existing technologies, sludge co-firing projects in thermal power plants require maintenance personnel to control the start-up and shutdown of the sludge system and adjust equipment output by assessing the operation of the power plant's coal conveying system. This operational method increases the workload of maintenance personnel, and the frequent adjustments to the sludge system based on the coal conveying system increase the risk of human error.

[0022] To address the shortcomings of existing technologies, this solution provides the following embodiments: like Figure 1 and Figure 2As shown, an embodiment of the present invention provides an automatic control system for co-firing sludge in a thermal power plant, including a main control module 1, a sludge module 2 for storing and transporting sludge, a coal conveying module 3 for transporting coal samples, and a coal storage module 4 for storing raw coal.

[0023] The sludge module 2 includes a sludge storage bin 21 and a sludge conveying device 22, as well as multiple pipes 23 and valves 24 for connection. The coal conveying module 3 includes a coal conveying belt 31, each of which is equipped with a belt running sensor and a weighing sensor. The coal storage module 4 includes multiple raw coal bins 41, each of which is equipped with a material level sensor. A coal plow 42 is provided between the raw coal bins 41 and the coal conveying belt 31.

[0024] The main control module 1 is connected to the sludge module 2, the coal conveying module 3 and the coal storage module 4 respectively. The main control module 1 is used to receive signals from the sludge module 2, the coal conveying module 3 and the coal storage module 4 and send out corresponding control signals to realize unattended automated control of sludge co-firing.

[0025] The sludge module 2 and the raw coal storage module 41 are connected to the coal conveying module 3, and the output of the coal conveying module 3 is connected to equipment such as a pulverized coal boiler for co-firing sludge and raw coal. The modules interact via an industrial communication network. The main control module 1, as the core control unit, receives various operating signals from the sludge module 2, the coal conveying module 3, and the coal storage module 4, and outputs control commands based on preset control logic, thereby achieving automated operation of the sludge co-firing system.

[0026] In this embodiment, the sludge module 2 is mainly used for the storage, transportation, and addition of sludge. The sludge module 2 may include a sludge storage bin 21, sludge conveying equipment, and corresponding pipes 23 for conveying sludge, and valves 24 for controlling the sludge flow status in the pipes 23. The coal conveying module 3 is used for conveying raw coal and providing conveying status information. The coal conveying module 3 may include a coal conveying belt 31, and belt operation sensors and weighing sensors installed on the coal conveying belt 31. The belt operation sensors are used to sense the belt's operating speed and other statuses, and the weighing sensors are used to sense the weight of the material on the belt. The coal storage module 4 includes multiple raw coal bins 41 and level sensors installed on the raw coal bins 41. It also includes a coal plow 42 that cooperates with the coal conveying belt 31 to realize coal flow distribution and storage status feedback.

[0027] In actual operation, when the coal conveying system is started, the belt running sensor outputs the belt running signal, the weighing sensor outputs the coal conveying amount signal, and the raw coal bunker 41 determines the coal flow direction according to the state of the coal plow 42 and outputs the corresponding signal. The main control module 1 collects and makes logical judgments on the above signals. When the preset conditions are met, it outputs a control command to start the sludge module 2 and dynamically adjusts the sludge addition amount according to the coal conveying amount, thereby realizing the proportional co-firing of sludge and raw coal.

[0028] Compared to existing technologies that rely on manual judgment of the coal conveying system's operating status and manual start-up and shutdown of the sludge system, this embodiment uses multi-signal fusion judgment and automatic control logic to enable the sludge system to respond to the coal conveying system's operating status in real time, avoiding human error, improving system response speed and operational stability, thereby achieving unattended control of the sludge co-firing process, while reducing the workload of operators and improving the overall level of automation.

[0029] Depending on the actual application requirements, the main control module 1 can adopt a PLC control system, DCS system or industrial control computer, and the communication method can adopt fieldbus or industrial Ethernet. The sludge conveying method can also adopt screw conveying, pumping or other equivalent conveying methods according to the site conditions.

[0030] In summary, the automatic control system for sludge co-firing in thermal power plants provided in this embodiment of the invention has a main control module 1 that is communicatively connected to the sludge module 2, the coal conveying module 3, and the coal storage module 4. The main control module 1 receives in real time the belt operation signal and weighing signal of the coal conveying belt 31, the material level signal of the raw coal bunker 41, and the working status signal of the coal plow 42. After comprehensively judging the current coal conveying and coal storage conditions, it automatically sends start / stop commands and equipment output adjustment commands to the sludge module 2. This enables the sludge co-firing process to intelligently follow the original coal conveying and feeding conditions of the thermal power plant and operate automatically without human intervention. This avoids the problems of high labor intensity, slow response, and high risk of human error caused by relying on continuous manual monitoring and operation.

[0031] In one embodiment, the number of coal conveyor belts 31 is at least two, and at least one coal plow 42 is provided between each coal conveyor belt 31 and the raw coal bunker 41.

[0032] In this embodiment, the coal conveying module 3 is configured with at least two coal conveying belts 31, each coal conveying belt 31 is respectively set with multiple raw coal bunkers 41, and a coal plow 42 for distributing coal flow is set between the coal conveying belt 31 and the raw coal bunkers 41 to realize flexible switching between different coal conveying paths and different raw coal bunkers 41.

[0033] In practical applications, multi-path coal conveyor belts 31 are a standard configuration in thermal power plants. They can improve the redundancy and scheduling flexibility of the coal conveying system. By setting up a coal plow 42 between each coal conveyor belt 31 and the raw coal bunker 41, the direction of coal flow can be dynamically changed during the coal conveying process, so that the coal enters the designated raw coal bunker 41.

[0034] The main control module 1 can accurately determine the current coal flow path by collecting the operation signals of different coal conveyor belts 31 and the status signals of the corresponding coal plows 42, thereby determining the target location for sludge addition. For example, when a certain coal conveyor belt 31 is in operation and the coal plow 42 of the corresponding raw coal bunker 41 is in the falling state, the main control module 1 determines that the coal flow is entering the raw coal bunker 41, thereby controlling the sludge module 2 to add sludge to the corresponding position of the coal conveyor belt 31.

[0035] When multiple coal conveyor belts 31 are running simultaneously, the main control module 1 can also calculate the total coal conveying volume based on the weighing signals of each coal conveyor belt 31, and allocate the sludge addition amount proportionally. By controlling the opening of the valves 24 at each addition point, the sludge can be reasonably distributed on different coal conveying paths.

[0036] In one embodiment, the main control module 1 is used to receive belt running signals from the belt running sensor and weighing signals from the weighing sensor. The main control module 1 can determine the operating status of the coal conveying module 3 based on the belt running signals and the weighing signals.

[0037] In this embodiment, in order to accurately identify the operating status of the coal conveying system, a belt running sensor and a weighing sensor are installed on the coal conveying belt 31 in the coal conveying module 3. The belt running sensor is used to detect whether the coal conveying belt 31 is in operation, and the weighing sensor is used to obtain the material flow information on the coal conveying belt 31 in real time. The main control module 1 receives the above two types of signals and performs a combined judgment to determine the actual operating status of the coal conveying system.

[0038] For example, when the belt running signal is present and the weighing signal is greater than zero, the coal conveying system is determined to be in normal conveying state. When the belt running signal is present but the weighing signal is close to zero, the coal conveying system may be in an unloaded or abnormal state. When the belt running signal is lost, the coal conveying system is determined to be shut down.

[0039] Based on this, the main control module 1 further sets a start threshold based on the weighing signal. When the coal conveying amount is lower than the preset threshold, the sludge module 2 remains in standby mode to avoid unstable co-firing due to low load operation. When the coal conveying amount is higher than the preset threshold, the main control module 1 controls the sludge module 2 to start and add sludge according to the preset ratio, thereby ensuring a stable co-firing ratio of sludge and raw coal.

[0040] In one embodiment, the main control module 1 is used to receive the working status signal from the coal plow 42 and the material level signal from the material level sensor. The main control module 1 can control the working status of the sludge module 2 according to the working status signal and the material level signal to adjust the sludge co-firing ratio.

[0041] In this embodiment, the raw coal silo 41 in the coal storage module 4 is equipped with a material level sensor, and the coal plow 42 set on the coal conveying path provides information on the coal flow direction. The main control module 1 further constrains the sludge addition conditions by simultaneously collecting the material level signal and the status signal of the coal plow 42, thereby achieving more refined control.

[0042] When the material level in a certain raw coal silo 41 is below a preset threshold and that silo 41 is a silo where sludge co-firing is permitted, and the corresponding coal plow 42 is in the lowered state, the main control module 1 determines that the current coal flow is entering the raw coal silo 41 and that co-firing conditions are met, thus allowing sludge addition. When the material level reaches a high level or the silo is full, the main control module 1 controls the sludge module 2 to stop adding sludge to prevent material accumulation or affecting the stable operation of the boiler. When the coal plow 42 points to a raw coal silo 41 where sludge co-firing is not permitted, regardless of whether other conditions are met, the main control module 1 outputs a shutdown command to prohibit sludge addition, thereby avoiding affecting the fuel quality of the specific raw coal silo 41.

[0043] Furthermore, in further optimization, the main control module 1 can also dynamically adjust the sludge addition amount according to the material level change trend, making the sludge co-firing process more stable.

[0044] By introducing the linkage control between the material level signal and the coal plow 42 signal, this embodiment can achieve precise matching between the sludge co-firing and the operating status of the raw coal bunker 41, effectively avoiding problems such as sludge mis-addition, excessive addition, or incorrect addition position, thereby improving the safety and stability of system operation and ensuring the stability of boiler combustion conditions.

[0045] like Figure 3 The figure shows a control method for an automatic control system for co-firing sludge in a thermal power plant according to any of the foregoing embodiments of the present invention, comprising the following steps: Step S301: The main control module 1 obtains the belt running signal and weighing signal collected by the coal conveying belt 31 from the coal conveying module 3.

[0046] Step S302: The main control module 1 acquires the material level signal of the raw coal bunker 41 and the working status signal of the coal plow 42.

[0047] Step S303: The main control module 1 determines whether the start-up conditions are met based on the belt running signal, weighing signal, working status signal and material level signal.

[0048] Step S304: If the start-up conditions are met, the main control module 1 starts the sludge module 2 and controls the sludge conveying device 22 to convey sludge to the coal conveying belt 31.

[0049] Step S305: The main control module 1 adjusts the sludge conveying rate of the sludge module 2 according to the weighing signal.

[0050] Specifically, the main control module 1 first obtains the belt operation signal and weighing signal collected by the coal conveying belt 31 from the coal conveying module 3, and at the same time obtains the material level signal of the raw coal bunker 41 in the coal storage module 4 and the working status signal of the coal plow 42. By performing centralized analysis on the above multi-source data, it determines whether the current coal conveying system and raw coal supply status meet the start-up conditions for sludge co-firing.

[0051] When the start-up conditions are met, the main control module 1 issues a control command to start the sludge module 2 and controls the sludge conveying device 22 to convey sludge to the coal conveying belt 31, so that the sludge and raw coal are mixed during the conveying process. During the sludge conveying process, the main control module 1 continuously receives the conveying amount information fed back by the weighing sensor and dynamically adjusts the sludge conveying rate according to the weighing signal, thereby realizing the stable co-firing of sludge and raw coal in a set ratio.

[0052] This embodiment links the coal conveying operation status, raw coal supply status and sludge conveying control to achieve automated closed-loop control of the sludge co-firing process. This avoids the response lag and co-firing ratio fluctuation problems caused by traditional reliance on manual experience judgment, thereby significantly improving the system's operational stability and co-firing accuracy.

[0053] In one embodiment, step S304 specifically includes: If the conditions for judgment are met simultaneously, the coal conveyor belt 31 is in operation, the plow 42 of the corresponding raw coal bunker 41 is in the lowering state, and the material level of the raw coal bunker 41 is lower than the preset threshold, then the start-up conditions are met.

[0054] The main control module 1 controls the sludge module 2 to start and adds sludge to the coal conveyor belt 31.

[0055] This embodiment further refines the specific judgment logic for the start-up conditions. After the main control module 1 obtains the belt running signal, the material level signal, and the working status signal of the coal plow 42, it first determines whether the coal conveying belt 31 is in a stable operating state. Then, it determines whether the coal plow 42 of the corresponding raw coal bunker 41 is in a falling state to ensure that the raw coal can fall normally to the coal conveying belt 31. At the same time, it determines whether the material level in the raw coal bunker 41 is lower than the preset threshold to ensure that there is a need for replenishment.

[0056] When all three conditions are met simultaneously, the system is determined to be in a state where co-firing is permitted. Based on this, the main control module 1 starts the sludge module 2 and performs the sludge addition operation. Through the above multi-condition coupling judgment mechanism, the sludge conveying can be erroneously started under unsuitable conditions for co-firing, such as when the coal conveyor belt 31 is stopped, the raw coal bunker 41 is full, or no coal discharge operation has been performed. This prevents sludge accumulation, equipment blockage, or system abnormalities, and improves the safety and reliability of system operation.

[0057] In one embodiment, step S305 specifically includes: Obtain the preset blending ratio of sludge and raw coal.

[0058] The main control module 1 calculates the raw coal conveying rate of the coal conveyor belt 31 based on the weighing signal detected by the weighing sensor.

[0059] The main control module 1 adjusts the sludge conveying rate of the sludge conveying device 22 according to the raw coal conveying rate of the coal conveying belt 31, so that the sludge conveying amount and the raw coal conveying amount maintain a preset blending ratio.

[0060] In this embodiment, the main control module 1 pre-acquires or sets the target blending ratio of sludge to raw coal, and calculates the instantaneous flow rate of raw coal based on the real-time raw coal conveying rate detected by the weighing sensor on the coal conveyor belt 31. Subsequently, the main control module 1 back-calculates the corresponding target sludge conveying rate according to the target blending ratio, and dynamically adjusts the actual sludge conveying amount by adjusting the operating parameters of the sludge conveying device 22, so that the sludge and raw coal are always kept within the set ratio range.

[0061] This embodiment introduces a dynamic proportional control mechanism based on real-time weighing data, which, compared to the traditional method of adding sludge at a fixed flow rate, can better adapt to the impact of fluctuations in raw coal flow rate, thereby ensuring the stability of the blending ratio, improving combustion efficiency, and reducing emission fluctuations.

[0062] In one embodiment, it further includes: When the weighing signal of the coal conveyor belt 31 is lower than the preset flow threshold, the main control module 1 controls the sludge conveying device 22 to be in standby mode and not to convey.

[0063] When the weighing signal is higher than the preset flow threshold, the main control module 1 controls the sludge conveying device 22 to convey sludge according to the preset ratio.

[0064] In this embodiment, in order to set up a flow threshold judgment mechanism based on the weighing signal, when the weighing signal of the coal conveyor belt 31 is detected to be lower than the preset flow threshold, the main control module 1 determines that the current raw coal conveying volume is too low and it is not suitable for sludge co-firing. At this time, the sludge conveying device 22 is controlled to enter the standby state and the sludge conveying is stopped.

[0065] When the weighing signal recovers to a level higher than the preset flow threshold, the main control module 1 resumes sludge conveying and controls it according to the set co-firing ratio. This strategy effectively avoids localized accumulation or equipment contamination caused by continuous sludge addition under low flow or even no-load conditions, improving the system's adaptability and operational reliability.

[0066] In one embodiment, when multiple coal conveyor belts 31 are running simultaneously, the control module determines the total amount of sludge transported based on the weighing signal of each coal conveyor belt 31, and distributes the sludge proportionally to each coal conveyor belt 31 by adjusting the opening of the valve 24 on the corresponding pipe 23.

[0067] In this embodiment, for the complex working condition of multiple coal conveyor belts 31 operating in parallel, the main control module 1 further has a multi-path distribution control function. When multiple coal conveyor belts 31 are running at the same time, the main control module 1 obtains the weighing signal of each coal conveyor belt 31, and calculates the total flow rate of raw coal and the proportion of each belt according to their respective raw coal conveying rates, thereby determining the total amount of sludge conveyed and the distribution ratio of each branch.

[0068] Subsequently, by adjusting the opening degree of the valves 24 or the distribution mechanism on the corresponding pipelines 23, the sludge is distributed proportionally to each coal conveyor belt 31, achieving multi-channel coordinated co-firing. This embodiment, by constructing a multi-path coordinated control mechanism, enables the system to adapt to the multi-line coal conveying conditions of large thermal power plants. While ensuring the overall co-firing ratio, it achieves balanced addition among each coal conveying branch, thereby avoiding local over- or under-addition problems and improving the overall coordination and refined control level of the system.

[0069] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0070] In a comprehensive embodiment of the present invention, the control logic of the automatic control system for the co-firing of sludge in a thermal power plant is further described in detail, taking into account the actual operating conditions. According to the system's operational requirements, the coal conveying module 3 typically includes at least two coal conveying belts 31, denoted as conveyor belt A 31 and conveyor belt B 31. Each conveyor belt 31 is equipped with a corresponding weighing sensor and a belt running sensor. Each conveyor belt 31 corresponds to several raw coal bins 41, and the distribution and conveying to different raw coal bins 41 are achieved through a coal plow 42. During system operation, the main control module 1 continuously receives belt running signals and weighing signals from each conveyor belt 31, and simultaneously receives level sensor signals from each raw coal bin 41 in the coal storage module 4, as well as the working status signals of the coal plow 42, thereby achieving real-time determination of the coal conveying path and the target raw coal bin 41.

[0071] Specifically, when the A-line coal conveyor belt 31 has a belt operation signal, the main control module 1 further determines whether any of the multiple raw coal bins 41 corresponding to the coal conveyor belt 31 is in a receiving state, allowing for the co-firing of sludge. This receiving state is reflected by the working status signal of the plow 42; that is, when the plow 42 of any corresponding raw coal bin 41 is in a falling state, it indicates that the material on the current coal conveyor belt 31 is being introduced into that raw coal bin 41. Simultaneously, the main control module 1 also needs to combine the material level sensor signal to determine whether the raw coal bin 41 is in a state where it can receive material, for example, if the material level is below a preset upper limit threshold, to avoid overflow. When the above conditions are simultaneously met, the main control module 1 determines that the sludge co-firing start-up conditions are met, and then sends a start-up control signal to the sludge module 2 to control the sludge conveying device 22 to convey sludge to the A-line coal conveyor belt 31, achieving synchronous co-firing of sludge and raw coal.

[0072] During sludge transport, the main control module 1 dynamically adjusts the sludge transport rate based on the real-time weighing signal from the weighing sensor. When the weighing signal of the coal conveying belt 31 on route A is detected to be lower than the preset flow threshold (e.g., 50 t / h), it indicates that the current coal transport load is low. To avoid imbalance in the sludge blending ratio or impact on the stability of the coal transport system, the main control module 1 controls the sludge conveying device 22 to be in a energized standby state, i.e., the drive device is powered but does not perform conveying actions. When the weighing signal reaches or exceeds the preset flow threshold, the main control module 1 calculates the sludge transport volume corresponding to the current raw coal transport volume according to the preset blending ratio (e.g., 5%), and adjusts the operating parameters of the sludge conveying device 22 accordingly to maintain a stable ratio between the sludge transport volume and the raw coal transport volume, thereby ensuring the continuity and stability of the blending process.

[0073] For the B-line coal conveyor belt 31, its control logic is basically the same as that of the A-line coal conveyor belt 31. That is, when the main control module 1 detects that the B-line coal conveyor belt 31 has a belt running signal and the plow 42 of the raw coal bunker 41 that allows sludge to be mixed is in the falling state, and the material level meets the receiving conditions, it controls the sludge module 2 to start and dynamically adjusts the sludge conveying rate according to the weighing signal of the B-line coal conveyor belt 31. When the weighing signal is lower than the preset flow threshold, it maintains the standby state, and when the weighing signal is higher than the threshold, it conveys sludge according to the preset ratio.

[0074] In a further embodiment, when both coal conveyor belt 31 (A-line) and coal conveyor belt 31 (B-line) are operating simultaneously, and the coal plows 42 of the raw coal bunkers 41 corresponding to the two conveyor belts 31 are in the lowered state, the main control module 1 determines that the system has entered a multi-path co-firing mode. At this time, the main control module 1 obtains the raw coal conveying volume of each of the two conveyor belts 31 based on their weighing signals and calculates the total raw coal conveying volume. When the weighing signals of both conveyor belts 31 are lower than the preset flow threshold, the main control module 1 still controls the sludge conveying device 22 to remain in a energized standby state; when the weighing signals of both conveyor belts 31 reach or exceed the preset flow threshold, the main control module 1 calculates the total sludge conveying volume according to the preset ratio of the total raw coal conveying volume, and distributes the sludge proportionally to the coal conveyor belts 31 (A-line) and 31 (B-line) by adjusting the opening of the valves 24 on each conveying pipe 23 in the sludge module 2, thereby achieving balanced co-firing control under the multi-path coal conveying system.

[0075] Furthermore, during system operation, the main control module 1 possesses comprehensive protection and control logic. When the loss of belt operation signal or weighing signal of any coal conveyor belt 31 is detected, the main control module 1 determines that the current coal conveying system is abnormal, immediately triggers the protection mechanism, sends a shutdown control signal to the sludge module 2, controls the sludge conveying device 22 to stop operating, and sequentially closes the relevant pipelines 23 and valves 24 in order from near to far, to prevent sludge from stagnating or abnormally accumulating in the conveying pipeline 23, thereby improving the safety and reliability of system operation.

[0076] Furthermore, during the continuous operation of the coal conveying system, the main control module 1 dynamically adjusts the operating status of the sludge module 2 based on the real-time changes in the material level signals of each raw coal bunker 41 and the working status signals of the plow 42. For example, when a change in the status of the plow 42 causes the material conveying target of the current coal conveying belt 31 to switch from the raw coal bunker 41 that allows sludge co-firing to the raw coal bunker 41 that does not allow sludge co-firing, the main control module 1 immediately issues a shutdown command to the sludge module 2 to stop sludge conveying, so as to prevent the raw coal bunker 41 that does not meet the co-firing requirements from receiving mixed fuel, thereby ensuring the standardization of fuel management in the power plant.

[0077] Through the above control method, this embodiment realizes multi-dimensional linkage control based on the operating status of the coal conveying system, the receiving status of the raw coal bunker 41, and the real-time weighing signal, so that the sludge co-firing process has a high degree of automation and self-adaptation capability. It can not only achieve precise distribution of sludge under multi-coal conveying conditions, but also perform timely protection control in abnormal situations, thereby significantly improving the operational stability, safety and economy of the sludge co-firing system.

[0078] like Figure 4The diagram shows a hardware structure of an electronic device according to the present invention, including a memory 402, a processor 401, and an electronic device program on the memory 402. The processor 401 executes the electronic device program to implement the steps of the control method of any of the above embodiments.

[0079] Figure 4 Take a processor 401 as an example.

[0080] The electronic device may also include an input device 403 and a display device 404.

[0081] The processor 401, memory 402, input device 403 and display device 404 can be connected by a bus or other means. The figure shows an example of connection by a bus.

[0082] The memory 402, as a non-volatile electronic device readable storage medium, can be used to store non-volatile software programs, non-volatile electronic device executable programs, and modules, such as the program instructions / modules corresponding to the control method in the embodiments of this application. The processor 401 executes various functional applications and data processing by running the non-volatile software programs, instructions, and modules stored in the memory 402, thereby implementing the control method in the above embodiments.

[0083] Memory 402 may include a program storage area and a data storage area, wherein the program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created according to the use of the control method, etc. Furthermore, memory 402 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 402 may optionally include memory remotely located relative to processor 401, and these remote memories may be connected to the apparatus performing the control method via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0084] Input device 403 can receive user clicks and generate signal inputs related to user settings and function control of the control method. Display device 404 may include display screens or other display devices.

[0085] The one or more modules are stored in the memory 402, and when run by the one or more processors 401, they execute the control method in any of the above method embodiments.

[0086] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An automatic control system for co-firing sludge in thermal power plants, characterized in that, It includes a main control module, a sludge module for storing and transporting sludge, a coal conveying module for transporting coal samples, and a coal storage module for storing raw coal. The sludge module includes a sludge storage bin and a sludge conveying device, and also includes multiple pipes and valves for connection. The coal conveying module includes a coal conveying belt, each of which is equipped with a belt running sensor and a weighing sensor. The coal storage module includes multiple raw coal bins, each of which is equipped with a material level sensor. A coal plow is provided between the raw coal bin and the coal conveying belt. The main control module is communicatively connected to the sludge module, the coal conveying module, and the coal storage module. The main control module is used to receive signals from the sludge module, the coal conveying module, and the coal storage module, and to issue corresponding control signals to realize unattended automated control of sludge co-firing.

2. The automatic control system for co-firing sludge from thermal power plants according to claim 1, characterized in that, The number of coal conveyor belts is at least two, and at least one coal plow is installed between each coal conveyor belt and the raw coal bunker.

3. The automatic control system for co-firing sludge from thermal power plants according to claim 1, characterized in that, The main control module is used to receive belt running signals from the belt running sensor and weighing signals from the weighing sensor. The main control module can determine the operating status of the coal conveying module based on the belt running signals and weighing signals.

4. The automatic control system for co-firing sludge from thermal power plants according to claim 1, characterized in that, The main control module is used to receive the working status signal from the coal plow and the material level signal from the material level sensor. The main control module can control the working status of the sludge module to adjust the sludge co-firing ratio according to the working status signal and the material level signal.

5. A control method for an automatic control system for co-firing sludge in a thermal power plant as described in any one of claims 1-4, characterized in that, include: The main control module obtains the belt operation signal and weighing signal collected by the coal conveying module from the coal conveying belt; The main control module acquires the material level signal from the raw coal bunker and the working status signal from the coal plow. The main control module determines whether the start-up conditions are met based on the belt running signal, weighing signal, working status signal and material level signal; If the startup conditions are met, the main control module starts the sludge module and controls the sludge conveying device to convey sludge to the coal conveyor belt. The main control module adjusts the sludge conveying rate of the sludge module based on the weighing signal.

6. The control method according to claim 5, characterized in that, If the startup conditions are met, the main control module starts the sludge module and controls the sludge conveying device to transport sludge to the coal conveyor belt, specifically including: If the conditions for judgment are met simultaneously, such as the coal conveyor belt being in operation, the plow of the corresponding raw coal bunker being in the lowered state, and the material level of the raw coal bunker being lower than the preset threshold, then the start-up conditions are met. The main control module controls the sludge module to start and add sludge to the coal conveyor belt.

7. The control method according to claim 6, characterized in that, The main control module adjusts the sludge conveying rate of the sludge module according to the weighing signal, specifically including: Obtain the preset blending ratio of sludge and raw coal; The main control module calculates the raw coal conveying rate of the coal conveyor belt based on the weighing signal detected by the weighing sensor. The main control module adjusts the sludge conveying rate of the sludge conveying device according to the raw coal conveying rate of the coal conveying belt, so that the sludge conveying amount and the raw coal conveying amount maintain the preset blending ratio.

8. The control method according to claim 7, characterized in that, Also includes: When the weighing signal of the coal conveyor belt is lower than the preset flow threshold, the main control module controls the sludge conveying device to be in standby mode and not to convey. When the weighing signal is higher than the preset flow rate threshold, the main control module controls the sludge conveying device to convey sludge according to the preset ratio.

9. The control method according to claim 5, characterized in that, Also includes: When multiple coal conveyor belts are running simultaneously, the control module determines the total amount of sludge transported based on the weighing signals of each coal conveyor belt, and distributes the sludge proportionally to each coal conveyor belt by adjusting the valve openings on the corresponding pipelines.

10. An electronic device comprising a memory, a processor, and an electronic device program on the memory, characterized in that, The processor executes the electronic device program to implement the steps of the control method according to any one of claims 5-9.

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