A waste incineration power plant ash conveying control method, device, medium and system

Abstract

The application discloses a kind of waste incineration power plant ash conveying control method, device, medium and system, method includes steps: S1, obtains waste incinerator evaporation capacity set value, real-time parameter of garbage calorific value and leakage residue conveyor real-time weight;S2, according to waste incinerator evaporation capacity set value and real-time parameter of garbage calorific value, the running speed of grate of waste incinerator and the garbage residence of waste incinerator grate;S3, according to the running speed of grate on waste incinerator, the garbage residence of waste incinerator grate and preset grate leakage residue ratio, the leakage residue amount of ash conveying system is obtained;S4, according to the proportion of leakage residue amount accounts for rated ash conveying capacity of ash conveying system, the basic frequency of leakage residue conveyor is obtained;S5, according to the basic frequency of leakage residue conveyor and leakage residue conveyor real-time weight, the frequency of leakage residue conveyor motor operation is obtained.The application has the advantages of simple operation, high degree of automation, control precision and the like.

Description

TECHNICAL FIELD

[0001] The present application mainly relates to the technical field of waste incineration, in particular to a waste incineration power plant ash conveying control method, device, medium and system. BACKGROUND

[0002] In the industry of waste incineration power plant, the ash conveying system is mainly composed of a scraper in the boiler and the flue gas treatment center, which can transport the ash generated in the combustion process to the ash treatment equipment, remove the ash in the combustion process, and has important functions such as protecting the environment and improving the power generation efficiency.

[0003] The current ash conveying system can transport the ash generated in the combustion process to the ash treatment equipment, but the scraper motor in the ash conveying system is running at a power frequency and does not have an adjustment function, so it cannot adjust the speed of the scraper motor according to the weight of the ash generated in real time during the combustion process. If the amount of ash generated during the combustion process is too large, the scraper will be overloaded and the chain will be severely worn. If the amount of ash generated during the combustion process is too small, it will cause the phenomenon of big horse pulling small cart, resulting in power loss and affecting the economic efficiency of the system. At the same time, the scraper motors in the existing ash conveying system do not have linkage control, and cannot be started and stopped at the same time. SUMMARY

[0004] In view of the technical problems existing in the prior art, the present application provides a waste incineration power plant ash conveying control method, device, medium and system which can maintain the scraper motor at an optimal frequency and have high automation.

[0005] To solve the above technical problems, the technical solution provided by the present application is as follows:

[0006] A waste incineration power plant ash conveying control method, comprising the steps of:

[0007] S1, obtaining the real-time parameters of the evaporation capacity set value of the waste incinerator, the real-time parameters of the waste heat value and the real-time weight of the leakage ash conveyor;

[0008] S2, obtaining the reference speed of the grate of the waste incinerator and the ash retention amount of the grate of the waste incinerator according to the evaporation capacity set value of the waste incinerator and the real-time parameters of the waste heat value;

[0009] S3, obtaining the leakage amount of the ash conveying system according to the reference speed of the grate of the waste incinerator, the ash retention amount of the grate of the waste incinerator and the preset leakage ash proportion of the grate;

[0010] S4, obtaining the basic frequency of the leakage ash conveyor according to the proportion of the leakage amount in the rated ash conveying capacity of the ash conveying system;

[0011] S5, obtaining the frequency of the motor operation of the leakage ash conveyor according to the basic frequency of the leakage ash conveyor and the real-time weight of the leakage ash conveyor.

[0012] Preferably, the specific process of step S2 is as follows:

[0013] According to the real-time parameters of the evaporation capacity setting value of the waste incinerator and the waste heat value, the waste treatment capacity is obtained.

[0014] According to the waste treatment capacity, the residence time of the waste on the grate, and the slag rate, the waste residence amount of the grate of the waste incinerator is obtained.

[0015] Preferably, the specific process of step S3 is as follows:

[0016] According to the reference speed of the grate of the waste incinerator and the reference speed-correction coefficient curve of the grate, the first correction coefficient is obtained.

[0017] According to the first correction coefficient, the preset grate slag leakage ratio is corrected to obtain the corrected slag leakage ratio.

[0018] According to the waste residence amount of the grate of the waste incinerator and the slag leakage ratio, the slag leakage amount of the ash conveying system is obtained.

[0019] Preferably, the specific process of step S5 is as follows:

[0020] According to the real-time weight of the slag leakage conveyor and the weight-correction coefficient curve of the conveyor, the second correction coefficient is obtained.

[0021] According to the basic frequency of the slag leakage conveyor and the second correction coefficient, the frequency of the motor operation of the slag leakage conveyor is obtained.

[0022] Preferably, the specific formula of obtaining the frequency of the motor operation of the slag leakage conveyor according to the basic frequency of the slag leakage conveyor and the second correction coefficient is as follows:

[0023] The frequency of the motor operation of the slag leakage conveyor = the basic frequency of the slag leakage conveyor * the second correction coefficient.

[0024] Preferably, if the steam blowing operation signal is received, the frequency of the motor of the slag leakage conveyor is directly set to 50 HZ.

[0025] The application also discloses a waste incineration power plant ash conveying control device, which comprises a waste heat value acquisition module, a slag leakage conveyor real-time weight acquisition module and a control module.

[0026] The application further discloses a computer program product comprising a computer program, which executes the steps of the method when run by a processor.

[0027] The application further discloses a computer readable storage medium, which stores a computer program, and the computer program executes the steps of the method when run by a processor.

[0028] The application further discloses a waste incineration power plant ash conveying control system, which comprises a memory and a processor connected with each other, and the memory stores a computer program, and the computer program executes the steps of the method when run by the processor.

[0029] Compared with the prior art, the application has the advantages that:

[0030] The frequency converter is used to control the motor of the scraper, three initial data of the boiler load, the reference speed of the grate and the heat value of the garbage are used as the theoretical slag leakage data after conversion, and are used as the feedforward signal of the control system; the weight of the slag in the scraper is measured in real time, and the feedforward signal of the theoretical slag leakage is corrected, and finally the frequency of the motor of the scraper is automatically controlled; special working conditions such as steam blowing and hydraulic blowing can be introduced, and if the signal is yes, the feedforward control program is directly skipped, and the speed of the scraper is adjusted to the maximum.

[0031] When the weight of the ash and slag in the scraper is too large, the frequency of the motor of the scraper can be automatically increased, the rotating speed of the motor of the scraper is increased, and the normal operation of the ash conveying system is ensured; when the weight of the ash and slag in the scraper is too small, the frequency of the motor of the scraper can be automatically reduced, the rotating speed of the motor of the scraper is reduced, and the power consumption is reduced, so that economic operation is achieved; when the amount of the ash and slag in the scraper is stable, the motor of the scraper is maintained at the best frequency, and the wear of the chain of the scraper is reduced; the motor of the scraper in the ash conveying system is started and stopped at the same time, centralized control is realized, the structure is simple, installation is convenient, and the realization is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The flowchart of the ash conveying control method of the application is shown in the embodiment.

[0033] Figure 2 The reference speed of the grate-correction coefficient curve in the application is shown in the embodiment.

[0034] Figure 3 The conveyor weight-correction coefficient curve in the application is shown in the embodiment.

[0035] Figure 4 The embodiment of the control device in the application is shown in the embodiment.

[0036] Figure 5 The structure diagram of the control device of the application is shown in the embodiment.

[0037] Legend: 1. Scraper conveyor; 2. Motor; 3. Weighing module; 4. Variable frequency drive control box; 401. Communication module; 402. Variable frequency drive; 403. PLC; 5. Server; 501. Gateway; 502. DPU; 503. Ethernet module; 504. Power supply module; 6. Remote monitoring platform. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1 As shown in the figure, the ash conveying control method for waste incineration power plants provided in this embodiment of the invention includes the following steps:

[0040] S1. Obtain the setpoint for the evaporation rate of the waste incinerator, the real-time parameters of the calorific value of the waste, and the real-time weight of the slag conveyor.

[0041] S2. Based on the set value of the evaporation rate of the waste incinerator and the real-time parameters of the calorific value of the waste, the reference speed of the grate on the simulated waste incinerator and the amount of waste retained on the grate of the simulated waste incinerator are obtained.

[0042] S3. Based on the reference speed of the grate on the simulated waste incinerator, the amount of waste retained on the grate of the simulated waste incinerator, and the preset grate ash leakage ratio, the leakage amount of the ash conveying system is simulated.

[0043] S4. Based on the ratio of the simulated slag leakage amount to its rated ash conveying capacity, the fundamental frequency of the slag leakage conveyor is obtained; specifically, this ratio * 50Hz is used to obtain the fundamental frequency of the simulated slag leakage conveyor.

[0044] S5. Based on the basic frequency of the slag conveyor and the real-time weight of the slag conveyor, obtain the operating frequency of the motor of the slag conveyor.

[0045] Specifically, the process of step S2 is as follows:

[0046] The waste processing capacity is obtained based on the setpoint of the waste incinerator's evaporation rate and the real-time parameters of the waste's calorific value.

[0047] The amount of waste retained on the grate of a waste incinerator is obtained based on the amount of waste processed, the time the waste stays on the grate, and the slag ratio.

[0048] Specifically, the process of step S3 is as follows:

[0049] Based on the reference speed of the grate in the waste incinerator, and the curve of reference speed versus correction factor (which is a known curve, such as...) Figure 2 As shown), the first correction factor is obtained;

[0050] The preset grate leakage residue ratio is corrected according to the first correction coefficient, and a corrected leakage residue ratio is obtained.

[0051] According to the garbage residence amount of the grate of the garbage incinerator and the leakage residue ratio, the leakage residue amount of the ash conveying system is obtained.

[0052] Specifically, the specific process of step S5 is:

[0053] According to the real-time weight of the leakage residue conveyor and a weight-correction coefficient curve (which is a known curve, as shown in Figure 3 , a second correction coefficient is obtained.

[0054] According to the base frequency of the leakage residue conveyor and the second correction coefficient, the frequency of the motor of the leakage residue conveyor is obtained, and the specific formula is: the frequency of the motor of the leakage residue conveyor = the base frequency of the leakage residue conveyor * the second correction coefficient.

[0055] If a steam blowing operation signal is received, the frequency of the motor of the leakage residue conveyor is directly set to 50 Hz.

[0056] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings in the specification and specific embodiments.

[0057] S1, a certain incinerator is set to have an evaporation capacity of 100 t / h, a garbage heat value of 8 MJ / kg, and is provided with 4 leakage residue conveyors with a rated conveying capacity of 3 t / h.

[0058] S2, according to the evaporation capacity and the garbage heat value, according to the experience value, the garbage treatment capacity is about 36 t / h, the grate reference speed is 5.5 m / h, the residence time of the garbage on the grate is 4 h, the slag rate is 25%, and the garbage and slag residence amount on the grate is: 36*4*25%=36 t / h.

[0059] S3, according to the garbage residence amount 36 t / h, the leakage residue ratio 10%, and the first correction coefficient (1.45), the grate leakage residue amount is obtained: 36*10%*1.45=5.22 t / h.

[0060] S4, the conveying capacity of each leakage residue conveyor needs to reach 5.22 / 4=1.3 t / h, which accounts for 43.5% of the rated conveying capacity 3 t / h of the leakage residue conveyor, and the base frequency is 43.5%*50 Hz=21.75 Hz.

[0061] S5, the weight of the internal slag output by the weighing module of the leakage residue conveyor is 1.5 t, as shown in Figure 2 , the corresponding second correction coefficient is 1.8, and the final operating frequency of the leakage residue conveyor is: 21.75*1.8=39.15 Hz.

[0062] If the steam blowing operation signal is received, the speed is directly adjusted to the highest, and the frequency of the residue conveying machine is set to 50HZ.

[0063] As shown in Figure 4 The embodiment of the application further discloses a waste incineration power plant ash conveying control device, which comprises a waste heat value acquisition module, a residue conveying machine real-time weight acquisition module (a weighing module 3) and a control module (such as a PLC 403), the waste heat value acquisition module and the residue conveying machine real-time weight acquisition module are connected with the control module, and are used for acquiring real-time parameters of a waste heat value and a real-time weight of a residue conveying machine and sending the real-time parameters and the real-time weight to the control module; the control module executes steps of the method as described above according to the real-time parameters of the waste heat value and the real-time weight of the residue conveying machine to perform ash conveying control.

[0064] The control device of the application has simple structure, is convenient to install, and is convenient for centralized control of an automatic control mode of an ash conveying system of a waste incineration power plant, so that the wear rate of a scraper 1 chain is reduced, and energy consumption waste is reduced.

[0065] As shown in Figure 5 In specific application, when the scraper 1 is normally operated, the tail end weighing module 3 monitors the weight of the ash and slag on the scraper 1 in real time and transmits the weight to the PLC 403 in the frequency converter control box 4, the PLC 403 changes the output instruction of the frequency converter 402 in real time according to the variable, thereby controlling the motor 2 of the first section of the scraper 1 and changing the rotating speed of the motor 2 to meet the operating conditions under different loads; meanwhile, the PLC 403 enters the server 5 through the communication module 401, the server 5 first enters the DPU 502 through the gateway 501 to collect, process and store information, finally, the communication protocol is converted through the Ethernet module 503 and remotely transmitted to the remote monitoring platform 6 such as a PC end, which can be a mobile phone, a tablet computer or a computer, and the PC end can issue the instruction of simultaneously starting and stopping the motor 2 of the scraper 1 of the boiler, the furnace and the flue gas treatment center. The server 5 is powered through the power module 504.

[0066] The application adopts the frequency converter 402 to control the motor 2 of the scraper 1, adopts three initial data of the boiler load, the furnace grate reference speed and the waste heat value, converts the three initial data as the theoretical residue amount data as the feedforward signal of the control system, measures the weight of the slag in the scraper 1 in real time to correct the feedforward signal of the theoretical residue amount, and finally realizes the automatic control of the frequency of the motor 2 of the scraper 1; special conditions such as steam blowing and water blowing can be introduced, and if the signal is yes, the feedforward control program is directly skipped, and the speed of the scraper 1 is adjusted to the maximum.

[0067] The present application can automatically increase the frequency of the motor 2, increase the rotating speed of the motor 2, and ensure the normal operation of the ash conveying system when the weight of the ash in the scraper 1 is too large; can automatically reduce the frequency of the motor 2, reduce the rotating speed of the motor 2, and reduce the power consumption when the weight of the ash in the scraper 1 is too small, so as to achieve economic operation; can maintain the motor 2 at the optimal frequency when the amount of the ash in the scraper 1 is stable, so as to reduce the wear of the chain of the scraper 1; can simultaneously start and stop the motor 2 in the ash conveying system, and realize centralized control; and the above structure is simple, easy to install, and convenient to realize.

[0068] The present application also discloses a computer program product comprising a computer program which, when executed by a processor, performs the steps of the method described above. The present application further discloses a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method described above. The present application also discloses a waste incineration power plant ash conveying control system comprising a memory and a processor connected to each other, wherein the memory has stored thereon a computer program which, when executed by the processor, performs the steps of the method described above. The products, media and systems of the present application correspond to the method described above, and also have the advantages of the method described above.

[0069] The present application can realize all or part of the processes in the above-mentioned embodiment methods, and can also be completed by computer program instruction related hardware. The computer program can be stored in a computer readable storage medium, and the computer program can realize the steps of the above-mentioned method embodiment when executed by a processor. The computer program includes computer program code, which can be in the form of source code, object code, executable files or some intermediate forms. The computer readable storage medium includes any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. The memory is used to store computer programs and / or modules, and the processor realizes various functions by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory. The memory can include high-speed random access memory, and can also include non-volatile memory such as hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device, etc.

[0070] The above are only preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical scheme falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary skilled in the art, some improvements and refinements without departing from the principles of the present application shall be considered as the protection scope of the present application.

Claims

1. A method for controlling the delivery of ash from a waste incineration power plant, characterized in that The method comprises the steps of: S1, obtaining the evaporation capacity setting value of the waste incinerator, the real-time parameters of the waste heat value and the real-time weight of the leakage residue conveyor; S2, obtaining the reference speed of the grate of the waste incinerator and the residue retention amount of the grate of the waste incinerator according to the evaporation capacity setting value of the waste incinerator and the real-time parameters of the waste heat value; S3, obtaining the leakage residue amount of the ash conveying system according to the reference speed of the upper grate of the waste incinerator, the residue retention amount of the grate of the waste incinerator and the preset leakage residue proportion of the grate; S4, obtaining the basic frequency of the leakage residue conveyor according to the proportion of the leakage residue amount in the rated ash conveying capacity of the ash conveying system; S5, obtaining the frequency of the motor operation of the leakage residue conveyor according to the basic frequency of the leakage residue conveyor and the real-time weight of the leakage residue conveyor. The specific process of step S2 is as follows: obtaining the waste treatment amount according to the evaporation capacity setting value of the waste incinerator and the real-time parameters of the waste heat value; obtaining the residue retention amount of the grate of the waste incinerator according to the waste treatment amount, the residence time of the waste on the grate and the residue rate.

2. The ash conveying control method for a waste incineration power plant according to claim 1, characterized by, The specific process of step S3 is as follows: obtaining the first correction coefficient according to the reference speed of the upper grate of the waste incinerator and the reference speed-correction coefficient curve; correcting the preset leakage residue proportion of the grate according to the first correction coefficient to obtain the corrected leakage residue proportion; obtaining the leakage residue amount of the ash conveying system according to the residue retention amount of the grate of the waste incinerator and the leakage residue proportion.

3. The ash conveying control method for a waste incineration power plant according to claim 1 or 2, characterized by, The specific process of step S5 is as follows: obtaining the second correction coefficient according to the real-time weight of the leakage residue conveyor and the weight-correction coefficient curve of the conveyor; obtaining the frequency of the motor operation of the leakage residue conveyor according to the basic frequency of the leakage residue conveyor and the second correction coefficient.

4. The ash conveying control method for a waste incineration power plant according to claim 3, characterized by, The specific formula for obtaining the frequency of the motor operation of the leakage residue conveyor according to the basic frequency of the leakage residue conveyor and the second correction coefficient is as follows: The frequency of the motor operation of the leakage residue conveyor = the basic frequency of the leakage residue conveyor * the second correction coefficient.

5. The ash conveying control method for a waste incineration power plant according to claim 3, characterized by, If the steam blowing operation signal is received, the frequency of the motor of the leakage residue conveyor is directly set to 50 HZ.

6. A control device for ash conveying in a waste incineration power plant, characterized in that The method comprises a waste heat value acquisition module, a real-time weight acquisition module of the leakage residue conveyor and a control module, the waste heat value acquisition module and the real-time weight acquisition module of the leakage residue conveyor are connected with the control module, and are used for acquiring the real-time parameters of the waste heat value and the real-time weight of the leakage residue conveyor and sending the same to the control module; The control module executes the steps of the method according to the real-time parameters of the waste heat value and the real-time weight of the leakage residue conveyor to perform the ash conveying control.

7. A computer program product comprising a computer program, characterized in that, The computer program executes the steps of the method according to any one of claims 1-5 when the computer program is run by the processor.

8. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program executes the steps of the method according to any one of claims 1-5 when the computer program is run by the processor.

9. A fly ash conveying control system for a waste incineration power plant, comprising a memory and a processor connected to each other, said memory having stored thereon a computer program, characterized in that, The computer program executes the steps of the method according to any one of claims 1-5 when the computer program is run by the processor.

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