Multi-coal-type self-adaptive transmission control system

Abstract

The invention relates to the technical field of automatic transmission, in particular to a multi-coal-type self-adaptive transmission control system which comprises a transmission unit used for transmitting different coal types; the coal feeding unit comprises a plurality of weighing units and a plurality of second conveying belts, and the weighing units are used for monitoring the weight of each coal type in real time; the plurality of second conveying belts are respectively used for conveying different coal types; the powder grinding unit comprises a powder grinding speed control unit and a powder feeding speed control unit, and the powder grinding speed control unit is used for mixing different coal types and then controlling the powder grinding speed; the pulverized coal feeding speed control unit is used for conveying pulverized coal to the combustion boiler for power generation; and the central control unit is used for adjusting the conveying speed of the first conveying belt, the conveying speed of the second conveying belt, the grinding speed of the grinding speed control unit and the pulverized coal conveying speed of the pulverized coal feeding speed control unit according to the combustion requirements after the coals in different proportions are mixed, so that the maximum value of heat in the combustion boiler is obtained. The problem that multi-coal conveying control of an existing thermal power plant is difficult is solved.

Description

Technical Field

[0001] The invention relates to the technical field of automated transmission, and in particular to a multi-type coal adaptive transmission control system. Background Art

[0002] Thermal power generation is a method of generating electricity by burning fossil fuels (such as coal, natural gas, fuel oil, etc.) to generate heat energy, and then converting the heat energy into electrical energy. Coal is one of the common fuels for thermal power generation, and different types of coal have different applications in power generation.

[0003] In actual use, different types of coal are usually mixed for use based on considerations such as adjusting the combustion characteristics and performance of coal, improving combustion efficiency, reducing emissions, and reducing costs. However, multi-coal mixed power generation also needs to consider factors such as the compatibility, mixing ratio, and combustion characteristics of different coal types. In actual operation, the mixing ratio and combustion parameters need to be precisely controlled to ensure the safe and stable operation of the equipment. Controlling the transmission speed of each coal type to control the proportion of each coal type is a feasible method.

[0004] Therefore, the present invention provides a multi-coal type adaptive transmission control system to solve the problem of mixed transmission of multiple coal types. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a multi-coal type adaptive transmission control system to solve the problem of the difficulty of mixed transmission control of multiple coal types.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a multi-type coal adaptive transmission control system, the control system includes: a transmission unit, the transmission unit includes a plurality of first conveyor belts, the plurality of first conveyor belts are respectively used to transmit different types of coal; a coal feeding unit, including a plurality of weighing units and a plurality of second conveyor belts, the plurality of weighing units correspond one-to-one to the plurality of first conveyor belts and the plurality of second conveyor belts, and are used to monitor the weight of each type of coal in real time; the plurality of second conveyor belts are respectively used to transmit different types of coal, and the transmission speed of each second conveyor belt is adjusted according to the weight of each type of coal monitored by the weighing unit; a grinding unit, including a grinding speed control unit and a powder feeding speed control unit. The grinding speed control unit is used to mix several different types of coal transmitted by the second conveyor belt and control the grinding speed; the powder feeding speed control unit is used to transport the coal powder mixed by the grinding speed control unit to the combustion boiler for power generation; the central control unit stores the combustion requirements after mixing coal types in different proportions, and the central control unit is connected to the transmission unit, the coal feeding unit and the grinding unit. The central control unit is used to adjust the transmission speeds of several first conveyor belts, the transmission speeds of several second conveyor belts, the grinding speed of the grinding speed control unit and the coal powder transportation speed of the powder feeding speed control unit according to the combustion requirements after mixing coal types in different proportions, so as to obtain the maximum heat value in the combustion boiler.

[0007] A further improvement of the present application is that the combustion requirements after mixing different proportions of coal types at least include the mass ratio of each coal type at different blending ratios, the particle size of the coal powder after blending at different blending ratios, and the demand for coal powder per unit time at different blending ratios.

[0008] A further improvement of the present application is that the control system also includes: a storage unit, the storage unit includes a plurality of storage bins, the plurality of storage bins are located between a plurality of first conveyor belts and a plurality of coal feeding units, a plurality of storage bins are each provided with a material level metering unit group, the material level metering unit group is used to monitor the inventory of the coal types in the storage bins, and send the information to the central control unit according to the changes in the inventory of the coal types, and adjust the transmission speed of the plurality of first conveyor belts through the central control unit.

[0009] A further improvement of the present application is that the material level metering unit group includes a first material level metering unit and a second material level metering unit, and the second material level metering unit is located above the first material level metering unit. If the stock height of the coal type in the storage bin is below the lower limit of the height that can be monitored by the first material level metering unit, an instruction to increase the transmission speed of several first conveyor belts is issued through the central control unit until the stock height of the coal type in the storage bin is above the lower limit of the height that can be monitored by the first material level metering unit; if the stock height of the coal type in the storage bin is above the lower limit of the height that can be monitored by the first material level metering unit and below the upper limit of the height that can be monitored by the second material level metering unit, an instruction to maintain the transmission speed of several first conveyor belts is issued through the central control unit; if the stock height of the coal type in the storage bin is above the upper limit of the height that can be monitored by the second material level metering unit, an instruction to reduce the transmission speed of several first conveyor belts is issued through the central control unit until the stock height of the coal type in the storage bin is below the upper limit of the height that can be monitored by the second material level metering unit.

[0010] A further improvement of the present application is that the method for adjusting the transmission speed of each of the second transmission belts according to the weight of each type of coal monitored by the weighing unit comprises the following steps:

[0011] The real-time weight of each type of coal monitored by the weighing unit is obtained and sent to the central control unit, which generates the average weight of each type of coal per unit time and the actual mass ratio of each type of coal;

[0012] The mass ratio of each type of coal at different blending ratios stored in the central control unit is obtained, and the transmission speed of each second conveyor belt is adjusted according to the difference between the actual mass ratio of each type of coal and the mass ratio of each type of coal at different blending ratios, until the ratio between the actual mass of each type of coal per unit time on each second conveyor belt meets the mass ratio requirement of each type of coal at different blending ratios.

[0013] A further improvement of the present application is that the control system also includes: a number of coal type identification units, which are all connected to the central control unit and the grinding speed control unit, and are arranged above a number of second conveyor belts to obtain coal type information on the number of second conveyor belts, wherein the coal type information includes the particle size, humidity and hardness of each coal type after mixing.

[0014] A further improvement of the present application is that the method for controlling the grinding speed by the grinding speed control unit comprises the following steps:

[0015] Obtain the particle sizes of the coal powder after mixing at different mixing ratios stored in the central control unit, generate a particle size comparison result according to the particle sizes of the mixed coal types sent by the coal type identification units, and send the comparison result to the central control unit;

[0016] The central control unit sends a speed control instruction to the grinding speed control unit according to the comparison result of the particle size, and adjusts the gap between the grinding roller and the grinding disc until the particle size of the mixed coal types in the grinding unit meets the particle size of the mixed coal powder at different blending ratios.

[0017] A further improvement of the present application is that the control system also includes: a flow detection unit, which is connected to the central control unit and is arranged in a coal powder conveying pipeline connected to the combustion boiler, and is used to obtain real-time mass flow data of the current coal powder.

[0018] A further improvement of the present application is that the method for controlling the coal powder conveying speed by the coal powder conveying speed control unit comprises the following steps:

[0019] Obtain the demand for pulverized coal per unit time at different blending ratios stored in the central control unit, generate average mass flow data of pulverized coal per unit time based on the real-time mass flow data of pulverized coal sent by the flow detection unit, compare the average mass flow data of pulverized coal per unit time with the demand for pulverized coal per unit time at different blending ratios, generate a comparison result of the demand for pulverized coal per unit time, and send it to the central control unit;

[0020] The central control unit sends a comparison result of the coal powder demand per unit time to the powder delivery speed control unit; if the average mass flow rate of the coal powder per unit time is greater than the coal powder demand per unit time at different blending ratios stored in the central control unit, the powder delivery speed control unit reduces the fan speed until the average mass flow rate of the coal powder per unit time reaches the coal powder demand per unit time at the same blending ratio; if the average mass flow rate of the coal powder per unit time is less than the coal powder demand per unit time at different blending ratios stored in the central control unit, the powder delivery speed control unit increases the fan speed until the average mass flow rate of the coal powder per unit time reaches the coal powder demand per unit time at the same blending ratio.

[0021] The beneficial effects of the present invention are as follows: a multi-coal adaptive transmission control system of the present application realizes a high degree of automation and precision in the process of coal mixing, grinding and powder delivery through the intelligent control of the central control unit. By introducing a storage unit and a material level metering unit group, the system can monitor the inventory of coal types in the storage bin in real time and automatically adjust the transmission speed accordingly. The addition of the coal type identification unit enables the system to accurately identify key parameters such as particle size, humidity and hardness of each type of coal. These parameters are crucial for the control of the grinding speed. Through real-time feedback and adjustment, the system can ensure that the coal powder particle size output by the grinding unit meets the combustion requirements under different blending ratios, further improving the combustion efficiency and stability. The coordinated work of the flow detection unit and the powder delivery speed control unit realizes the precise control of the coal powder delivery speed. The system can dynamically adjust the fan speed according to the actual needs of the combustion boiler to ensure that the coal powder is delivered to the boiler combustion chamber in a stable and appropriate manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a multi-coal type adaptive transmission control system of the present invention;

[0023] Figure 2 It is a specific schematic structural diagram of a multi-coal type adaptive transmission control system of the present invention. DETAILED DESCRIPTION

[0024] The following will describe various embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0025] Example

[0026] like Figure 1-2 As shown, a multi-type coal adaptive transmission control system, the control system comprises:

[0027] The transmission unit includes a plurality of first transmission belts, and the plurality of first transmission belts are respectively used to transmit different types of coal; specifically, the number of the first transmission belts can be determined according to the number of coal types specifically selected by the power plant.

[0028] The coal feeding unit comprises a plurality of weighing units and a plurality of second conveying belts, wherein the plurality of weighing units correspond to the plurality of first conveying belts and the plurality of second conveying belts respectively and are used to monitor the weight of each type of coal in real time; the plurality of second conveying belts are used to transport different types of coal respectively, and the transport speed of each second conveying belt is adjusted according to the weight of each type of coal monitored by the weighing units;

[0029] The grinding unit comprises a grinding speed control unit and a powder delivery speed control unit, wherein the grinding speed control unit is used to mix the different types of coal transmitted by the second conveyor belt and control the grinding speed; the powder delivery speed control unit is used to transport the coal powder mixed by the grinding speed control unit to the combustion boiler for power generation;

[0030] A central control unit stores therein the combustion requirements after mixing coal types in different proportions. The central control unit is connected to the transmission unit, the coal feeding unit and the grinding unit. The central control unit is used to adjust the transmission speeds of the first conveyor belts, the transmission speeds of the second conveyor belts, the grinding speed of the grinding speed control unit and the coal powder conveying speed of the powder feeding speed control unit according to the combustion requirements after mixing coal types in different proportions, so as to obtain the maximum heat value in the combustion boiler.

[0031] Specifically, the combustion requirements after mixing coal types in different proportions include at least the mass ratio of each coal type at different blending ratios, the particle size of the coal powder after blending at different blending ratios, and the demand for coal powder per unit time at different blending ratios.

[0032] In actual use, in order to maximize the heat in the combustion boiler, factors such as the temperature, pressure, and oxygen content in the combustion boiler also need to be considered. In this application, factors such as the temperature, pressure, and oxygen content in the combustion boiler are set to fixed values. In other words, in order to maximize the heat in the combustion boiler, it is only necessary to control the coal powder transmission speed.

[0033] In one embodiment of the present invention, the control system further comprises:

[0034] The storage unit comprises a plurality of storage bins, wherein the plurality of storage bins are located between a plurality of first conveyor belts and a plurality of coal feeding units, and a material level metering unit group is provided in each of the plurality of storage bins. The material level metering unit group is used to monitor the inventory of the coal types in the storage bins, and send the inventory changes of the coal types to the central control unit, and adjust the transmission speed of the plurality of first conveyor belts through the central control unit.

[0035] In actual use, the existence of storage bins can increase the fault tolerance of coal transmission and improve the efficiency of transmission.

[0036] Specifically, in order to more accurately control the storage capacity of the storage bin and thereby improve the accuracy of transmission, the material level metering unit group includes a first material level metering unit and a second material level metering unit, and the second material level metering unit is located above the first material level metering unit. If the stock height of the coal type in the storage bin is below the lower limit of the height that can be monitored by the first material level metering unit, an instruction to increase the transmission speed of several first conveyor belts is issued through the central control unit until the stock height of the coal type in the storage bin is above the lower limit of the height that can be monitored by the first material level metering unit; if the stock height of the coal type in the storage bin is above the lower limit of the height that can be monitored by the first material level metering unit and below the upper limit of the height that can be monitored by the second material level metering unit, an instruction to maintain the transmission speed of several first conveyor belts is issued through the central control unit; if the stock height of the coal type in the storage bin is above the upper limit of the height that can be monitored by the second material level metering unit, an instruction to reduce the transmission speed of several first conveyor belts is issued through the central control unit until the stock height of the coal type in the storage bin is below the upper limit of the height that can be monitored by the second material level metering unit.

[0037] It should be noted that, in actual use, the first material level metering unit and the second material level metering unit may be ultrasonic level meters.

[0038] Correspondingly, the method for adjusting the transmission speed of each of the second conveyor belts according to the weight of each type of coal monitored by the weighing unit comprises the following steps S101-S102:

[0039] S101, obtaining the real-time weight of each type of coal monitored by the weighing unit and sending it to the central control unit, which generates the average weight of each type of coal per unit time and the actual mass ratio of each type of coal;

[0040] S102. Obtain the mass ratio of each type of coal at different blending ratios stored in the central control unit, and adjust the transmission speed of each second conveyor belt according to the difference between the actual mass ratio of each type of coal and the mass ratio of each type of coal at different blending ratios, until the ratio between the actual mass of each type of coal per unit time on each second conveyor belt meets the mass ratio requirement of each type of coal at different blending ratios.

[0041] In one embodiment of the present invention, the control system further comprises:

[0042] A plurality of coal type identification units are connected to the central control unit and the grinding speed control unit, and are arranged above a plurality of second conveyor belts for obtaining coal type information on the plurality of second conveyor belts, wherein the coal type information includes the particle size, humidity and hardness of each coal type after mixing.

[0043] Correspondingly, the method for controlling the grinding speed by the grinding speed control unit comprises the following steps S201-S202:

[0044] S201, obtaining the particle sizes of the coal powder after mixing at different mixing ratios stored in the central control unit, generating a particle size comparison result according to the particle sizes of the mixed coal types sent by the coal type identification units, and sending the comparison result to the central control unit;

[0045] S202, the central control unit sends a speed control instruction to the grinding speed control unit according to the comparison result of the particle size, and adjusts the gap between the grinding roller and the grinding disc until the particle size of the mixed coal types in the grinding unit meets the particle size of the mixed coal powder at different blending ratios.

[0046] In one embodiment of the present invention, the control system further comprises:

[0047] A flow detection unit is connected to the central control unit and is arranged in a pulverized coal conveying pipeline connected to the combustion boiler to obtain real-time mass flow data of the current pulverized coal.

[0048] Correspondingly, the method for controlling the coal powder conveying speed by the coal powder conveying speed control unit comprises the following steps S301-S302:

[0049] S301, obtaining the demand for pulverized coal per unit time at different blending ratios stored in the central control unit, generating average mass flow data of pulverized coal per unit time according to the real-time mass flow data of pulverized coal sent by the flow detection unit, comparing the average mass flow data of pulverized coal per unit time with the demand for pulverized coal per unit time at different blending ratios, generating a comparison result of the demand for pulverized coal per unit time, and sending it to the central control unit;

[0050] S302. The central control unit sends a comparison result of the coal powder demand per unit time to the powder delivery speed control unit. If the average mass flow rate of the coal powder per unit time is greater than the coal powder demand per unit time at different blending ratios stored in the central control unit, the powder delivery speed control unit reduces the fan speed until the average mass flow rate of the coal powder per unit time reaches the coal powder demand per unit time at the same blending ratio; if the average mass flow rate of the coal powder per unit time is less than the coal powder demand per unit time at different blending ratios stored in the central control unit, the powder delivery speed control unit increases the fan speed until the average mass flow rate of the coal powder per unit time reaches the coal powder demand per unit time at the same blending ratio.

[0051] Compared with the prior art, the multi-coal type adaptive transmission control system of the present application has the following beneficial effects:

[0052] The multi-coal adaptive transmission control system of the present invention not only optimizes the fuel supply process of the combustion boiler, but also maximizes the combustion efficiency through refined control means. Furthermore, by introducing advanced sensor technology and data processing capabilities, the system realizes all-round monitoring and adjustment of the coal transmission, grinding and powder feeding process, thereby ensuring the stable operation and high-efficiency output of the combustion boiler.

[0053] In the specific implementation process, the intelligent characteristics of the system are particularly prominent. For example, the material level metering unit group in the storage unit ensures the precise control of the coal inventory in the storage bin through dual monitoring (the first material level metering unit and the second material level metering unit), effectively avoiding problems such as transmission interruption or low efficiency caused by insufficient or excessive coal reserves. At the same time, this refined control strategy also lays a solid foundation for the subsequent coal mixing and grinding process.

[0054] In addition, the introduction of the coal type identification unit adds a new dimension to the intelligent control of the system. Through real-time acquisition and analysis of coal type information on the second conveyor belt, the system can quickly identify key parameters such as coal particle size, humidity and hardness, and adjust the working state of the grinding speed control unit accordingly. This personalized adjustment strategy based on coal type characteristics not only improves the preparation quality of coal powder, but also makes the entire combustion process more stable and efficient.

[0055] The flow detection unit also plays a vital role in the pulverized coal conveying process. By accurately monitoring the real-time mass flow data in the pulverized coal conveying pipeline, the system can accurately grasp the supply of pulverized coal and adjust the working parameters of the pulverized coal delivery speed control unit accordingly. This dynamic adjustment mechanism ensures the continuity and stability of pulverized coal supply, thereby effectively avoiding problems such as unstable combustion or reduced efficiency caused by insufficient or excessive pulverized coal supply.

[0056] In summary, the multi-coal adaptive transmission control system of the present invention realizes all-round monitoring and adjustment of coal transmission, grinding and powder delivery processes by introducing advanced sensor technology, data processing capabilities and intelligent control strategies. The system not only improves the fuel supply efficiency and combustion stability of the combustion boiler, but also reduces the operating cost and maintenance difficulty.

[0057] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include: being implemented in one or more computer programs, which may be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general programmable processor, which may receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0058] The program code for implementing the method of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that the program code, when executed by the processor or controller, enables the functions / operations specified in the flow chart and / or block diagram to be implemented. The program code may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0059] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0060] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the computer. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0061] The systems and techniques described herein may be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), and the Internet.

[0062] A computer system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The relationship of client and server is generated by computer programs running on respective computers and having a client-server relationship with each other. The server may be a cloud server, a server of a distributed system, or a server combined with a blockchain.

[0063] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0064] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A multi-coal type adaptive transmission control system, characterized in that: The control system comprises: A transmission unit, wherein the transmission unit comprises a plurality of first transmission belts, wherein the plurality of first transmission belts are respectively used to transmit different types of coal; The coal feeding unit comprises a plurality of weighing units and a plurality of second conveying belts, wherein the plurality of weighing units correspond to the plurality of first conveying belts and the plurality of second conveying belts respectively and are used to monitor the weight of each type of coal in real time; the plurality of second conveying belts are used to transport different types of coal respectively, and the transport speed of each second conveying belt is adjusted according to the weight of each type of coal monitored by the weighing units; The grinding unit comprises a grinding speed control unit and a powder delivery speed control unit, wherein the grinding speed control unit is used to mix the different types of coal transmitted by the second conveyor belt and control the grinding speed; the powder delivery speed control unit is used to transport the coal powder mixed by the grinding speed control unit to the combustion boiler for power generation; A central control unit stores therein the combustion requirements after mixing coal types in different proportions. The central control unit is connected to the transmission unit, the coal feeding unit and the grinding unit. The central control unit is used to adjust the transmission speeds of the first conveyor belts, the transmission speeds of the second conveyor belts, the grinding speed of the grinding speed control unit and the coal powder conveying speed of the powder feeding speed control unit according to the combustion requirements after mixing coal types in different proportions, so as to obtain the maximum heat value in the combustion boiler.

2. The multi-coal type adaptive transmission control system according to claim 1 is characterized in that: The combustion requirements after mixing coal types in different proportions include at least the mass ratio of each coal type at different blending ratios, the particle size of the coal powder after blending at different blending ratios, and the demand for coal powder per unit time at different blending ratios.

3. The multi-coal type adaptive transmission control system according to claim 2 is characterized in that: The control system further comprises: The storage unit comprises a plurality of storage bins, wherein the plurality of storage bins are located between a plurality of first conveyor belts and a plurality of coal feeding units, and a material level metering unit group is provided in each of the plurality of storage bins. The material level metering unit group is used to monitor the inventory of the coal types in the storage bins, and send the inventory changes of the coal types to the central control unit, and adjust the transmission speed of the plurality of first conveyor belts through the central control unit.

4. The multi-coal type adaptive transmission control system according to claim 3 is characterized in that: The material level metering unit group includes a first material level metering unit and a second material level metering unit, and the second material level metering unit is located above the first material level metering unit. If the stock height of the coal type in the storage bin is below the lower limit of the height that can be monitored by the first material level metering unit, an instruction to increase the transmission speed of several first conveyor belts is issued through the central control unit until the stock height of the coal type in the storage bin is above the lower limit of the height that can be monitored by the first material level metering unit; if the stock height of the coal type in the storage bin is above the lower limit of the height that can be monitored by the first material level metering unit and below the upper limit of the height that can be monitored by the second material level metering unit, an instruction to maintain the transmission speed of several first conveyor belts is issued through the central control unit; if the stock height of the coal type in the storage bin is above the upper limit of the height that can be monitored by the second material level metering unit, an instruction to reduce the transmission speed of several first conveyor belts is issued through the central control unit until the stock height of the coal type in the storage bin is below the upper limit of the height that can be monitored by the second material level metering unit.

5. The multi-coal type adaptive transmission control system according to claim 4, characterized in that: The method for adjusting the transmission speed of each of the second conveyor belts according to the weight of each type of coal monitored by a weighing unit comprises the following steps: The real-time weight of each type of coal monitored by the weighing unit is obtained and sent to the central control unit, which generates the average weight of each type of coal per unit time and the actual mass ratio of each type of coal; The mass ratio of each type of coal at different blending ratios stored in the central control unit is obtained, and the transmission speed of each second conveyor belt is adjusted according to the difference between the actual mass ratio of each type of coal and the mass ratio of each type of coal at different blending ratios, until the ratio between the actual mass of each type of coal per unit time on each second conveyor belt meets the mass ratio requirement of each type of coal at different blending ratios.

6. The multi-coal type adaptive transmission control system according to claim 2, characterized in that: The control system further comprises: A plurality of coal type identification units are connected to the central control unit and the grinding speed control unit, and are arranged above a plurality of second conveyor belts for obtaining coal type information on the plurality of second conveyor belts, wherein the coal type information includes the particle size, humidity and hardness of each coal type after mixing.

7. The multi-coal type adaptive transmission control system according to claim 6, characterized in that: The method for controlling the grinding speed by the grinding speed control unit comprises the following steps: Obtain the particle sizes of the coal powder after mixing at different mixing ratios stored in the central control unit, generate a particle size comparison result according to the particle sizes of the mixed coal types sent by the coal type identification units, and send the comparison result to the central control unit; The central control unit sends a speed control instruction to the grinding speed control unit according to the comparison result of the particle size, and adjusts the gap between the grinding roller and the grinding disc until the particle size of the mixed coal types in the grinding unit meets the particle size of the mixed coal powder at different blending ratios.

8. The multi-coal type adaptive transmission control system according to claim 2, characterized in that: The control system further comprises: A flow detection unit is connected to the central control unit and is arranged in a pulverized coal conveying pipeline connected to the combustion boiler to obtain real-time mass flow data of the current pulverized coal.

9. The multi-coal type adaptive transmission control system according to claim 8, characterized in that: The method for controlling the coal powder conveying speed by the powder conveying speed control unit comprises the following steps: Obtain the demand for pulverized coal per unit time at different blending ratios stored in the central control unit, generate average mass flow data of pulverized coal per unit time based on the real-time mass flow data of pulverized coal sent by the flow detection unit, compare the average mass flow data of pulverized coal per unit time with the demand for pulverized coal per unit time at different blending ratios, generate a comparison result of the demand for pulverized coal per unit time, and send it to the central control unit; The central control unit sends a comparison result of the coal powder demand per unit time to the powder delivery speed control unit; if the average mass flow rate of the coal powder per unit time is greater than the coal powder demand per unit time at different blending ratios stored in the central control unit, the powder delivery speed control unit reduces the fan speed until the average mass flow rate of the coal powder per unit time reaches the coal powder demand per unit time at the same blending ratio; if the average mass flow rate of the coal powder per unit time is less than the coal powder demand per unit time at different blending ratios stored in the central control unit, the powder delivery speed control unit increases the fan speed until the average mass flow rate of the coal powder per unit time reaches the coal powder demand per unit time at the same blending ratio.

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