Ash conveying control method, device, medium and system for waste incineration power plant

Abstract

The invention discloses an ash conveying control method, device, medium and system for a waste incineration power plant. The method comprises the steps that S1, the evaporation capacity set value of a waste incinerator, the real-time parameter of a waste heat value and the real-time weight of a slag leakage conveyor are obtained; s2, according to the set value of the evaporation capacity of the garbage incinerator and the real-time parameters of the heat value of the garbage, the running speed of the fire grate of the garbage incinerator and the garbage retention amount of the fire grate of the garbage incinerator are obtained; s3, the slag leakage amount of the ash conveying system is obtained according to the running speed of the upper fire grate of the garbage incinerator, the garbage retention amount of the fire grate of the garbage incinerator and the preset fire grate slag leakage proportion; s4, the basic frequency of the slag leakage conveyor is obtained according to the proportion of the slag leakage amount to the rated ash conveying capacity of the ash conveying system; and S5, according to the basic frequency of the slag leakage conveyor and the real-time weight of the slag leakage conveyor, the operation frequency of the motor of the slag leakage conveyor is obtained. The device has the advantages of simplicity and convenience in operation, high automation degree, accuracy in control and the like.

Description

Technical Field

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

[0002] In industries such as waste incineration power plants, the ash conveying system is mainly composed of scrapers in the boilers, furnaces and flue gas treatment centers. It can transport the ash produced during the combustion process to the ash treatment equipment and remove the ash produced during the combustion process. It plays an important role in protecting the environment and improving power generation efficiency.

[0003] The current ash conveying system can transport the ash generated during the combustion process to the ash equipment, but the scraper motors in this ash conveying system are all operated at industrial frequency and do not have an adjustment function. The scraper motor speed cannot be adjusted according to the real-time weight of the ash generated during the combustion process. If the amount of ash generated during the combustion process is too large, the scraper will be overloaded and its chain will be worn out; if the amount of ash generated during the combustion process is too small, a phenomenon of a big horse pulling a small cart will occur, resulting in power loss and affecting the economic efficiency of the system operation. At the same time, the scraper motors of the pot and furnace and the flue gas treatment center in the existing ash conveying system do not have linkage control and cannot be started and stopped at the same time. Summary of the invention

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

[0005] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0006] A method for controlling ash conveying in a waste incineration power plant, comprising the steps of:

[0007] S1. Obtain the set value of the evaporation capacity of the waste incinerator, the real-time parameters of the waste calorific value and the real-time weight of the slag conveyor;

[0008] S2. According to the set value of the evaporation amount of the garbage incinerator and the real-time parameters of the calorific value of the garbage, the grate running speed of the garbage incinerator and the garbage retention amount of the grate of the garbage incinerator are obtained;

[0009] S3, according to the running speed of the grate on the waste incinerator, the garbage retention amount of the grate of the waste incinerator and the preset grate slag leakage ratio, the slag leakage amount of the ash conveying system is obtained;

[0010] S4. According to the ratio of the amount of slag leakage to the rated ash conveying capacity of the ash conveying system, the basic frequency of the slag leakage conveyor is obtained;

[0011] S5. According to the basic frequency of the slag conveyor and the real-time weight of the slag conveyor, the operating frequency of the motor of the slag conveyor is obtained.

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

[0013] The waste treatment capacity is obtained according to the real-time parameters of the evaporation capacity setting value of the waste incinerator and the calorific value of the waste;

[0014] The garbage retention amount on the grate of the waste incinerator is obtained based on the garbage processing volume, the garbage residence time on the grate and the slag rate.

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

[0016] According to the running speed of the grate on the garbage incinerator and the grate reference speed-correction coefficient curve, a first correction coefficient is obtained;

[0017] Correcting the preset grate slag leakage ratio according to the first correction coefficient to obtain a corrected slag leakage ratio;

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

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

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

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

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

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

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

[0025] The present invention also discloses an ash conveying control device for a waste incineration power plant, comprising a waste calorific value acquisition module, a slag conveyor real-time weight acquisition module and a control module. The waste calorific value acquisition module and the slag conveyor real-time weight acquisition module are both connected to the control module, and are used to obtain real-time parameters of the waste calorific value and the real-time weight of the slag conveyor and send them to the control module; the control module executes the steps of the method described above to perform ash conveying control according to the real-time parameters of the waste calorific value and the real-time weight of the slag conveyor.

[0026] The present invention further discloses a computer program product, comprising a computer program, wherein the computer program executes the steps of the method described above when executed by a processor.

[0027] The present invention also discloses a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described above are executed.

[0028] The present invention further discloses an ash conveying control system for a waste incineration power plant, comprising a memory and a processor connected to each other, wherein a computer program is stored in the memory, and when the computer program is run by the processor, the steps of the method described above are executed.

[0029] Compared with the prior art, the advantages of the present invention are:

[0030] The present invention adopts a frequency converter to control the scraper motor, and adopts three initial data of boiler load, grate speed and garbage calorific value, which are used as theoretical slag leakage data after conversion, and as a control system feedforward signal; the weight of slag in the scraper is measured in real time to correct the feedforward signal of the theoretical slag leakage, and finally realize automatic frequency control of the scraper motor; special working conditions such as steam soot blowing and hydraulic soot blowing can be introduced, and if the signal is yes, the feedforward control program is directly skipped to adjust the scraper speed to the maximum.

[0031] When the weight of ash in the scraper is too heavy, the present invention can automatically increase the frequency of the scraper motor, increase the speed of the scraper motor, and ensure the normal operation of the ash conveying system; when the weight of ash in the scraper is too light, the frequency of the scraper motor can be automatically reduced, the speed of the scraper motor can be reduced, and the power consumption can be reduced to achieve economical operation; when the amount of ash in the scraper is stable, the scraper motor is maintained at an optimal frequency to reduce the wear of the scraper chain; the scraper motors in the ash conveying system can be started and stopped at the same time to achieve centralized control; the above structure is simple, easy to install, and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flow chart of the ash conveying control method in an embodiment of the present invention.

[0033] Figure 2 It is a schematic diagram of the grate reference speed-correction coefficient curve in the present invention.

[0034] Figure 3 It is a schematic diagram of the conveyor weight-correction coefficient curve in the present invention.

[0035] Figure 4 This is a diagram showing an embodiment of the control device of the present invention in a specific application.

[0036] Figure 5 It is a structural diagram of the control device of the present invention in an embodiment.

[0037] Legend: 1. Scraper; 2. Motor; 3. Weighing module; 4. Inverter control box; 401. Communication module; 402. Inverter; 403. PLC; 5. Server; 501. Gateway; 502. DPU; 503. Ethernet module; 504. Power module; 6. Remote monitoring platform. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0039] like Figure 1 As shown, the ash conveying control method for a waste incineration power plant provided by an embodiment of the present invention comprises the following steps:

[0040] S1. Obtain the set value of the evaporation capacity of the waste incinerator, the real-time parameters of the waste calorific value and the real-time weight of the slag conveyor;

[0041] S2. According to the set value of the evaporation amount of the garbage incinerator and the real-time parameters of the calorific value of the garbage, the running speed of the grate on the simulated garbage incinerator and the amount of garbage retained on the grate of the simulated garbage incinerator are obtained;

[0042] S3, according to the running speed of the grate on the simulated waste incinerator, the amount of garbage retained on the grate of the simulated waste incinerator and the preset grate slag leakage ratio, the slag leakage amount of the ash conveying system is simulated;

[0043] S4. According to the ratio of the simulated slag leakage amount to its rated ash conveying capacity, the basic frequency of the slag leakage conveyor is obtained; specifically, the basic frequency of the simulated slag leakage conveyor is obtained by multiplying this ratio by 50Hz;

[0044] S5. According to the basic frequency of the slag conveyor and the real-time weight of the slag conveyor, the operating frequency of the motor of the slag conveyor is obtained.

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

[0046] The waste treatment capacity is obtained according to the real-time parameters of the evaporation capacity setting value of the waste incinerator and the calorific value of the waste;

[0047] The garbage retention amount on the grate of the waste incinerator is obtained based on the garbage processing volume, the garbage residence time on the grate and the slag rate.

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

[0049] According to the grate running speed of the waste incinerator and the grate reference speed-correction coefficient curve (known curve, such as Figure 2 As shown), the first correction coefficient is obtained;

[0050] Correcting the preset grate slag leakage ratio according to the first correction coefficient to obtain a corrected slag leakage ratio;

[0051] According to the garbage retention amount and slag leakage ratio of the grate of the garbage incinerator, the slag leakage 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 slag conveyor and the conveyor weight-correction coefficient curve (a known curve, such as Figure 3 As shown), the second correction coefficient is obtained;

[0054] According to the basic frequency of the slag conveyor and the second correction coefficient, the operating frequency of the slag conveyor motor is obtained. The specific formula is: the operating frequency of the slag conveyor motor = the basic frequency of the slag conveyor * the second correction coefficient.

[0055] If the steam soot blowing operation signal is received, the slag conveyor motor frequency will be directly set to 50HZ.

[0056] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0057] S1. The evaporation capacity of a certain incinerator is set at 100t / h, the calorific value of the garbage is 8MJ / kg, and there are 4 slag conveyors with a rated conveying capacity of 3t / h.

[0058] S2. According to the evaporation capacity and the calorific value of the garbage, based on the empirical values, the garbage processing capacity is about 36t / h, the grate reference speed is 5.5m / h, the garbage stay time on the grate is 4h, the slag rate is 25%, and the garbage and slag retention on the grate is: 36*4*25%=36t / h;

[0059] S3. According to the garbage retention volume of 36 t / h, the slag leakage ratio of 10% and the first correction coefficient (1.45), the grate slag leakage volume is obtained as follows: 36*10%*1.45=5.22 t / h;

[0060] S4, allocated to each slag conveyor, its conveying capacity must reach 5.22 / 4=1.3t / h, 1.3t / h accounts for 43.5% of the rated conveying capacity of the slag conveyor 3t / h, and the basic frequency is 43.5%*50Hz=21.75Hz;

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

[0062] If the steam soot blowing operation signal is received, the speed will be adjusted to the highest directly, and the slag conveyor frequency will be set to 50HZ.

[0063] like Figure 4 As shown, an embodiment of the present invention further discloses an ash conveying control device for a waste incineration power plant, including a garbage calorific value acquisition module, a slag conveyor real-time weight acquisition module (weighing module 3) and a control module (such as PLC403). The garbage calorific value acquisition module and the slag conveyor real-time weight acquisition module are both connected to the control module, and are used to obtain the real-time parameters of the garbage calorific value and the real-time weight of the slag conveyor and send them to the control module; the control module executes the steps of the method described above to perform ash conveying control according to the real-time parameters of the garbage calorific value and the real-time weight of the slag conveyor.

[0064] The control device of the present invention has a simple structure and is easy to install, and is convenient for centrally controlling the automatic control mode of the ash conveying system of the garbage incineration power plant, so as to reduce the wear rate of the chain of the scraper 1 and reduce energy waste.

[0065] like Figure 5 As shown, in specific applications, when the scraper 1 is operating normally, the tail end weighing module 3 monitors the weight of the ash on the scraper 1 in real time and transmits it to the PLC403 in the inverter control box 4. The PLC403 changes the output command of the inverter 402 in real time according to this variable, thereby controlling the motor 2 of the first section of the scraper 1, and changing the speed of the motor 2 to meet the operating conditions under different loads; at the same time, the PLC403 enters the server 5 through the communication module 401, and the server 5 first enters the DPU502 through the gateway 501 to collect, process and store information; finally, through the Ethernet module 503, the communication protocol is converted and remotely transmitted to the remote monitoring platform 6, such as the PC end, which can be a mobile phone, tablet or computer, and the PC end can issue instructions to start and stop the motor 2 of the scraper 1 of the boiler, furnace and flue gas treatment center at the same time. The server 5 is powered by the power module 504.

[0066] The present invention adopts a frequency converter 402 to control the motor 2 of the scraper 1, and adopts three initial data of boiler load, grate speed and garbage calorific value, which are used as theoretical slag leakage data after conversion, and as a control system feedforward signal; the weight of the slag in the scraper 1 is measured in real time to correct the feedforward signal of the theoretical slag leakage, and finally the frequency automatic control of the motor 2 of the scraper 1 is realized; special working conditions such as steam soot blowing and hydraulic soot blowing can be introduced, and if the signal is yes, the feedforward control program is directly skipped to adjust the speed of the scraper 1 to the maximum.

[0067] When the weight of ash in the scraper 1 is too heavy, the present invention can automatically increase the frequency of the motor 2, increase the rotation speed of the motor 2, and ensure the normal operation of the ash conveying system; when the weight of ash in the scraper 1 is too light, the frequency of the motor 2 can be automatically reduced, the rotation speed of the motor 2 can be reduced, and the power consumption can be reduced to achieve economical operation; when the amount of ash in the scraper 1 is stable, the motor 2 is maintained to operate at the optimal frequency, reducing the wear of the chain of the scraper 1; the motor 2 in the ash conveying system can be started and stopped at the same time to achieve centralized control; the above structure is simple, easy to install, and easy to implement.

[0068] The present invention also discloses a computer program product, including a computer program, which executes the steps of the above method when executed by a processor. The present invention further discloses a computer-readable storage medium, on which a computer program is stored, which executes the steps of the above method when executed by a processor. The present invention also discloses an ash conveying control system for a waste incineration power plant, including an interconnected memory and a processor, on which a computer program is stored, which executes the steps of the above method when executed by a processor. The product, medium and system of the present invention correspond to the above method and also have the advantages described in the above method.

[0069] The present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by hardware related to computer program instructions. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned method embodiment when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. Computer-readable storage media include: any entity or device that can carry computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. The memory is used to store computer programs and / or modules, and the processor implements various functions by running or executing computer programs and / or modules stored in the memory, and calling data stored in the memory. The memory may include high-speed random access memory and may also include non-volatile memory, such as a hard disk, an internal memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0070] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A method for controlling ash conveying in a waste incineration power plant, characterized in that: Includes steps: S1. Obtain the set value of the evaporation capacity of the waste incinerator, the real-time parameters of the waste calorific value and the real-time weight of the slag conveyor; S2. According to the set value of the evaporation amount of the garbage incinerator and the real-time parameters of the calorific value of the garbage, the grate running speed of the garbage incinerator and the garbage retention amount of the grate of the garbage incinerator are obtained; S3, according to the running speed of the grate on the waste incinerator, the garbage retention amount of the grate of the waste incinerator and the preset grate slag leakage ratio, the slag leakage amount of the ash conveying system is obtained; S4. According to the ratio of the amount of slag leakage to the rated ash conveying capacity of the ash conveying system, the basic frequency of the slag leakage conveyor is obtained; S5. According to the basic frequency of the slag conveyor and the real-time weight of the slag conveyor, the operating frequency of the motor of the slag conveyor is obtained.

2. The ash conveying control method for a waste incineration power plant according to claim 1, characterized in that: The specific process of step S2 is: The waste treatment capacity is obtained according to the real-time parameters of the evaporation capacity setting value of the waste incinerator and the calorific value of the waste; The garbage retention amount on the grate of the waste incinerator is obtained based on the garbage processing volume, the garbage residence time on the grate and the slag rate.

3. The ash conveying control method for a waste incineration power plant according to claim 2 is characterized in that: The specific process of step S3 is: According to the running speed of the grate on the garbage incinerator and the grate reference speed-correction coefficient curve, a first correction coefficient is obtained; Correcting the preset grate slag leakage ratio according to the first correction coefficient to obtain a corrected slag leakage ratio; According to the garbage retention amount and slag leakage ratio of the grate of the garbage incinerator, the slag leakage amount of the ash conveying system is obtained.

4. The ash conveying control method for a waste incineration power plant according to claim 1, 2 or 3, characterized in that: The specific process of step S5 is: According to the real-time weight of the slag conveyor and the conveyor weight-correction coefficient curve, a second correction coefficient is obtained; According to the basic frequency of the slag conveyor and the second correction coefficient, the operating frequency of the slag conveyor motor is obtained.

5. The ash conveying control method for a waste incineration power plant according to claim 4 is characterized in that: According to the basic frequency of the slag conveyor and the second correction coefficient, the specific formula for the operating frequency of the slag conveyor motor is: The operating frequency of the slag conveyor motor = the basic frequency of the slag conveyor * the second correction coefficient.

6. The ash conveying control method for a waste incineration power plant according to claim 4, characterized in that: If the steam soot blowing operation signal is received, the slag conveyor motor frequency will be directly set to 50HZ.

7. A ash conveying control device for a waste incineration power plant, characterized in that: It includes a garbage calorific value acquisition module, a slag conveyor real-time weight acquisition module and a control module. The garbage calorific value acquisition module and the slag conveyor real-time weight acquisition module are both connected to the control module and are used to acquire the real-time parameters of the garbage calorific value and the real-time weight of the slag conveyor and send them to the control module; The control module executes the steps of the method as described in any one of claims 1 to 6 to perform ash conveying control according to the real-time parameters of the garbage calorific value and the real-time weight of the slag conveyor.

8. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are performed.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the computer program performs the steps of the method according to any one of claims 1 to 6.

10. A ash conveying control system for a waste incineration power plant, comprising a memory and a processor connected to each other, wherein a computer program is stored in the memory, characterized in that: When the computer program is executed by a processor, the computer program performs the steps of the method according to any one of claims 1 to 6.

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