Intelligent control method and system applied to cement combined grinding

Abstract

The application discloses an intelligent control method and system applied to cement combined grinding. Firstly, the target value of the constant weight bin bin weight and the mill discharge elevator current is set; the measured value of the constant weight bin bin weight and the mill discharge elevator current is acquired, and the target control amount used in the current working condition is obtained by judging according to the measured value of the constant weight bin bin weight and the mill discharge elevator current; then, the output control amount is judged according to the target control amount, and the rotation speed of the upper rotation cage of the double-rotation-cage powder classifier and the rotation speed of the circulating fan are automatically controlled through the controller; meanwhile, the constant weight bin bin weight is used as the control amount of the total feeding amount, and the feeding amount is automatically adjusted by the controller. The application can solve the quality fluctuation and high energy consumption problems caused by the great fluctuation of key process parameters such as the constant weight bin bin weight and the mill discharge elevator current due to the unstable operation of the system working condition, realize automatic production control, improve the timeliness and consistency of the control, improve the production efficiency and reduce the energy consumption of enterprises.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic control, in particular to an intelligent control method and system applied to cement combined grinding. BACKGROUND

[0002] Cement grinding is the last process of cement manufacturing and also the process with the most power consumption. Its main function is to grind cement clinker (and retarder, performance adjusting material, etc.) to a suitable particle size (represented by fineness and specific surface area, etc.), form a certain particle size distribution, increase its hydration area, accelerate the hydration rate, and meet the requirements of cement paste setting and hardening.

[0003] Most of the control of domestic cement grinding systems is completed by manual operation of the operators. The cement combined grinding system has the characteristics of pure lag, large inertia, multivariable, strong coupling, and strong time-varying, which increases the control difficulty of the operators. From the parameter deviation to the start of adjustment is the interval of the operating point deviation and energy waste, and is also the interval of quality fluctuation and high energy consumption. When the running condition is unstable, the adjustment speed of manual operation is not timely, which leads to unstable system control in the production process, affects the yield, and further increases the power consumption of the grinding system. SUMMARY

[0004] Based on this, the embodiments of the present application provide an intelligent control method and system applied to cement combined grinding, which can solve the problems of quality fluctuation and high energy consumption caused by the large fluctuation of key process parameters such as constant weight bin bin weight and mill discharge elevator current caused by unstable system operating condition, realize automatic production control, improve the timeliness and consistency of control, improve production efficiency, and reduce enterprise energy consumption.

[0005] In a first aspect, an intelligent control method applied to cement combined grinding is provided, which comprises:

[0006] Setting target values of the constant weight bin bin weight and the mill discharge elevator current;

[0007] Obtaining measured values of the constant weight bin bin weight and the mill discharge elevator current, and obtaining a target control amount used in the current operating condition according to the measured values of the constant weight bin bin weight and the mill discharge elevator current;

[0008] Judging the output control amount according to the target control amount used, and automatically controlling the upper cage speed of the double-cage powder classifier and the circulating fan speed through the controller.

[0009] Optionally, the method further comprises:

[0010] The constant weight bin bin weight is used as the control amount of the total feeding amount, and the feeding amount is automatically adjusted by the controller.

[0011] Optionally, the target control quantity used in the current working condition is obtained by judging the measured values of the constant weight bin weight and the mill discharge elevator current, including:

[0012] By judging whether the deviation between the measured value and the target value of the controlled variable is within the allowable deviation range, and taking the variable within the deviation range as the target control quantity.

[0013] Optionally, the target set values of the constant weight bin weight and the mill discharge elevator current are set as SP1 and SP2, the real-time values of the constant weight bin weight and the mill discharge elevator current are set as PV1 and PV2, and E1 and E2 are set as the allowable deviation between the target value and the measured value of the controlled variable;

[0014] When the deviation between the measured value and the target value of the constant weight bin weight is within the allowable deviation E1 and the deviation between the measured value and the target value of the mill discharge elevator current is within the allowable deviation E2, SP2 and PV2 are selected for output;

[0015] When the deviation between the measured value and the target value of the constant weight bin weight is within the allowable deviation E1 and the deviation between the measured value and the target value of the mill discharge elevator current exceeds the allowable deviation E2, SP2 and PV2 are selected for output;

[0016] When the deviation between the measured value and the target value of the constant weight bin weight exceeds the allowable deviation E1 and the deviation between the measured value and the target value of the mill discharge elevator current is within the allowable deviation E2, SP1 and PV1 are selected for output;

[0017] When the deviation between the measured value and the target value of the constant weight bin weight exceeds the allowable deviation E1 and the deviation between the measured value and the target value of the mill discharge elevator current exceeds the allowable deviation E2, SP1 and PV1 are selected for output.

[0018] Optionally, the controller mainly adopts variable proportion variable integral PID and Smith prediction control.

[0019] In a second aspect, an intelligent control system applied to cement combined grinding is provided, and the system comprises:

[0020] A setting module is configured to set the target values of the constant weight bin weight and the mill discharge elevator current;

[0021] A judging module is configured to obtain the measured values of the constant weight bin weight and the mill discharge elevator current, and to obtain the target control quantity used in the current working condition by judging the measured values of the constant weight bin weight and the mill discharge elevator current;

[0022] A control module is configured to judge the output control quantity according to the target control quantity, and to automatically control the rotation speed of the upper rotation cage of the double-rotation-cage powder selector and the rotation speed of the circulating fan through the controller.

[0023] Optionally, the control module further comprises:

[0024] The constant weight bin weight is used as a control amount of the total feeding amount, and the feeding amount is automatically adjusted by the controller.

[0025] The technical scheme provided by the embodiment of the application has at least the following beneficial effects:

[0026] (1) The stable control of the mill elevator current and the steady flow bin weight in the cement combined grinding production process is the core of the stable production of the cement mill, but there are many common influencing factors for the two indexes, and a single set value may cause internal continuous fluctuation after the conventional control of the above-mentioned loop is realized, and the intelligent selection model is used for coordinated control of the two.

[0027] (2) The controller adopts the combination of variable proportional and integral PID control and Smith prediction control, realizes the automatic control of the multivariable coupling and large lag system in the cement combined grinding production process, realizes the automatic stable operation in the cement combined grinding production process, greatly reduces the workload of the operator, at the same time, explores the maximum potential of the production line, realizes the continuous and stable operation of the production process, and good results are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the application or the technical schemes in the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only exemplary, and those skilled in the art can also obtain other implementation drawings according to the provided drawings without creating any creative labor.

[0029] Figure 1 It is a cement combined grinding process diagram in the application;

[0030] Figure 2 It is a block diagram of the overall control scheme in the application;

[0031] Figure 3 It is a schematic diagram of the intelligent selection model in the application;

[0032] Reference signs:

[0033] 1-circulating elevator, 2-V-type powder concentrator, 3-feeding constant weight bin, 4-roller press, 5-TS4500 powder concentrator, 6-circulating fan, 7-cyclone, 8-ball mill, 9-mill elevator, 10-TS5000 powder concentrator. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0035] In the description of the present application, the terms "comprising", "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units explicitly listed, but can also include other steps or units inherent to these processes, methods, products or devices, or steps or units added based on further optimization of the concept of the present application.

[0036] Cement grinding refers to the process of processing the produced cement clinker through grinding machines to make it into fine cement powder. In the final stage of the cement production line, the clinker is sent to equipment such as ball mills or roller presses, and through physical action, it is gradually refined until the required particle size and surface area are reached. These fine cement particles can be more easily mixed with water, sand, aggregate and other materials to form high-strength concrete structures. Cement grinding is an indispensable link in the cement production process, which is related to the stability of cement quality and supply.

[0037] In the process, the constant weight bin is a device used for storing and weighing materials. In the cement production process, raw materials need to be accurately weighed and mixed to produce the required cement varieties. The constant weight bin accurately measures the raw materials through the weighing system and delivers them to the next process. The mill discharge elevator is a device used to transport the ground cement clinker. In the cement production process, the clinker needs to be transported to the next process for further processing and processing. The mill discharge elevator transports the clinker from the mill to the constant weight bin or other downstream equipment through mechanical devices.

[0038] For the technical scheme of the present application, as shown in the accompanying drawings Figure 1As shown, first, the raw materials are mixed according to a certain ratio by the electronic belt scale, then sent to the proportioning elevator, and after iron removal, the materials are lifted to the V-type powder separator for powder selection, the coarse particles are returned to the constant weight bin for buffering and then enter the roller press for rolling and crushing, and then the materials are lifted to the V-type powder separator by the circulating elevator, the relatively fine materials selected by the V-type powder separator enter the TS4500 powder selection lower rotating cage for primary selection, the particles larger than 200 um are returned to the constant weight bin after being selected by the lower rotating cage, the particles smaller than 200 um enter the TS4500 powder separator upper rotating cage for secondary selection, the qualified products are collected by the cyclone and then sent to the finished product chute to be mixed with the mill finished products, the unqualified products enter the ball mill for grinding, the materials ground by the ball mill are lifted to the TS5000 powder separator for selection, the qualified products are collected by the dust collection system and then enter the finished product chute to be mixed with the TS4500 finished products, and finally the products are sent to the cement storage as cement finished products, and the unqualified products are returned to the ball mill for regrinding.

[0039] Specifically, the intelligent control method applied to the cement combined grinding in the application specifically includes:

[0040] S1, setting the target values of the constant weight bin bin weight and the mill discharge elevator current.

[0041] S2, obtaining the measured values of the constant weight bin bin weight and the mill discharge elevator current, and judging the target control amount used in the current working condition according to the measured values of the constant weight bin bin weight and the mill discharge elevator current.

[0042] S3, judging the output control amount according to the target control amount, and automatically controlling the upper rotating cage speed of the double-rotating cage powder separator and the circulating fan speed by the controller; meanwhile, the constant weight bin bin weight is used as the control amount of the total feeding amount, and the feeding amount is automatically adjusted by the controller.

[0043] The application uses the constant weight bin bin weight and the mill discharge elevator current as the target setting values, judges whether the constant weight bin bin weight or the mill discharge elevator current should be used as the target control amount for control according to the real-time values of the constant weight bin bin weight and the mill discharge elevator current by the intelligent selection model. According to the intelligent selection model, the output control amount is judged, the system automatically controls the upper rotating cage speed of the TS4500 powder separator and the circulating fan speed by the controller; meanwhile, the constant weight bin bin weight is also used as the control amount of the total feeding amount, and the feeding amount is automatically adjusted by the controller, and the specific control scheme block diagram is shown in the accompanying Figure 2 .

[0044] In the intelligent selection model, SP1 and SP2 are the target values of the constant weight bin bin weight and the mill discharge elevator current, PV1 and PV2 are the measured values of the constant weight bin bin weight and the mill discharge elevator current, and E1 and E2 are the allowable deviations of the constant weight bin bin weight and the mill discharge elevator current, respectively, and the specific model block diagram is shown in the accompanying Figure 3 .

[0045] When the deviation of the measured value PV1 of the constant weight bin and the target value SP1 is within E1 and the deviation of the measured value PV2 of the mill discharge elevator current and the target value SP2 is within E2, SP2 and PV2 are selected as the output; when the deviation of the measured value PV1 of the constant weight bin and the target value SP1 is within E1 and the deviation of the measured value PV2 of the mill discharge elevator current and the target value SP2 exceeds E2, SP2 and PV2 are selected as the output; when the deviation of the measured value PV1 of the constant weight bin and the target value SP1 exceeds E1 and the deviation of the measured value PV2 of the mill discharge elevator current and the target value SP2 is within E2, SP1 and PV1 are selected as the output; when the deviation of the measured value PV1 of the constant weight bin and the target value SP1 exceeds E1 and the deviation of the measured value PV2 of the mill discharge elevator current and the target value SP2 exceeds E2, SP1 and PV1 are selected as the output, that is:

[0046] |SP1-PV1|≤E1, and |SP2-PV2|≤E2, SP2 and PV2 are selected as the output, that is, the mill discharge elevator current is taken as the controlled target;

[0047] |SP1-PV1|≤E1, and |SP2-PV2|>E2, SP2 and PV2 are selected as the output, that is, the mill discharge elevator current is taken as the controlled target;

[0048] |SP1-PV1|>E1, and |SP2-PV2|≤E2, SP1 and PV1 are selected as the output, that is, the constant weight bin weight is taken as the controlled target;

[0049] |SP1-PV1|>E1, and |SP2-PV2|>E2, SP1 and PV1 are selected as the output, that is, the constant weight bin weight is taken as the controlled target;

[0050] The controller mainly adopts variable proportion variable integral PID and Smith prediction control.

[0051] The embodiment of the application further provides an intelligent control system applied to cement combined grinding.

[0052] The setting module is used for setting the target values of the constant weight bin weight and the mill discharge elevator current.

[0053] The judgment module is used for obtaining the measured values of the constant weight bin weight and the mill discharge elevator current, and judging the target control amount used in the current working condition according to the measured values of the constant weight bin weight and the mill discharge elevator current.

[0054] The control module is used for judging the output control amount according to the target control amount used, and automatically controlling the rotation speed of the upper rotation cage of the double-rotation-cage powder classifier and the rotation speed of the circulating fan through the controller. Optionally, the control module further comprises: the constant weight bin weight as the control amount of the total feeding amount, and the feeding amount is automatically adjusted by the controller.

[0055] The intelligent control system applied to the cement combined grinding provided by the embodiments of the present application is used to realize the intelligent control method applied to the cement combined grinding. The specific limitations of the intelligent control system applied to the cement combined grinding can be referred to the limitations of the intelligent control method applied to the cement combined grinding in the foregoing, and will not be described here. Each part of the intelligent control system applied to the cement combined grinding can be realized by software, hardware and combinations thereof in whole or in part. Each module can be embedded in or independent of the processor in the device in the form of hardware, or can be stored in the memory in the device in the form of software, so as to be called and executed by the processor to perform the operations corresponding to each module.

[0056] Each technical feature of the above-described embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of each technical feature in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0057] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. An intelligent control method applied to cement combined grinding, characterized in that, The method comprises: Setting target values of the constant weight bin bin weight and the mill discharge elevator current; Obtaining measured values of the constant weight bin bin weight and the mill discharge elevator current, and judging the target control quantity used in the current working condition according to the measured values of the constant weight bin bin weight and the mill discharge elevator current; Judging the output control quantity according to the target control quantity used, and automatically controlling the upper cage rotating speed of the double-cage powder classifier and the circulating fan rotating speed through the controller; The target control quantity used in the current working condition is obtained by judging the measured values of the constant weight bin bin weight and the mill discharge elevator current, and comprises: Judging whether the deviation between the measured value and the target value of the controlled variable is within the allowed deviation range; Setting the target set values of the constant weight bin bin weight and the mill discharge elevator current as SP1 and SP2 respectively, setting the real-time values of the constant weight bin bin weight and the mill discharge elevator current as PV1 and PV2 respectively, and setting E1 and E2 as the allowed deviation between the target value and the measured value of the controlled variable; When the deviation between the measured value and the target value of the constant weight bin bin weight is within the allowed deviation E1 and the deviation between the measured value and the target value of the mill discharge elevator current is within the allowed deviation E2, SP2 and PV2 are selected as the output; When the deviation between the measured value and the target value of the constant weight bin bin weight is within the allowed deviation E1 and the deviation between the measured value and the target value of the mill discharge elevator current exceeds the allowed deviation E2, SP2 and PV2 are selected as the output; When the deviation between the measured value and the target value of the constant weight bin bin weight exceeds the allowed deviation E1 and the deviation between the measured value and the target value of the mill discharge elevator current is within the allowed deviation E2, SP1 and PV1 are selected as the output; When the deviation between the measured value and the target value of the constant weight bin bin weight exceeds the allowed deviation E1 and the deviation between the measured value and the target value of the mill discharge elevator current exceeds the allowed deviation E2, SP1 and PV1 are selected as the output.

2. The intelligent control method applied to the cement combined grinding according to claim 1, characterized in that, The method further comprises: The constant weight bin bin weight is used as the control quantity of the total feeding amount, and the feeding amount is automatically adjusted by the controller.

3. The intelligent control method for cement combined grinding as claimed in claim 1, wherein, The controller adopts variable proportion and variable integral PID and Smith prediction control.

4. An intelligent control system applied to cement combined grinding, characterized in that, The system comprises: A setting module for setting target values of the constant weight bin bin weight and the mill discharge elevator current; A judging module for obtaining measured values of the constant weight bin bin weight and the mill discharge elevator current, and judging the target control quantity used in the current working condition according to the measured values of the constant weight bin bin weight and the mill discharge elevator current; A control module for judging the output control quantity according to the target control quantity used, and automatically controlling the upper cage rotating speed of the double-cage powder classifier and the circulating fan rotating speed through the controller; The target control quantity used in the current working condition is obtained by judging the measured values of the constant weight bin bin weight and the mill discharge elevator current, and comprises: Judging whether the deviation between the measured value and the target value of the controlled variable is within the allowed deviation range; Setting the target set values of the constant weight bin bin weight and the mill discharge elevator current as SP1 and SP2 respectively, setting the real-time values of the constant weight bin bin weight and the mill discharge elevator current as PV1 and PV2 respectively, and setting E1 and E2 as the allowed deviation between the target value and the measured value of the controlled variable; When the deviation between the measured value and the target value of the constant weight bin bin weight is within the allowed deviation E1 and the deviation between the measured value and the target value of the mill discharge elevator current is within the allowed deviation E2, SP2 and PV2 are selected as the output; When the deviation of the measured value and the target value of the constant weight bin bin weight is within the allowable deviation E1 and the deviation of the measured value and the target value of the mill elevator current exceeds the allowable deviation E2, SP2 and PV2 are selected to be outputted; When the deviation of the measured value and the target value of the constant weight bin bin weight exceeds the allowable deviation E1 and the deviation of the measured value and the target value of the mill elevator current is within the allowable deviation E2, SP1 and PV1 are selected to be outputted; When the deviation of the measured value and the target value of the constant weight bin bin weight exceeds the allowable deviation E1 and the deviation of the measured value and the target value of the mill elevator current exceeds the allowable deviation E2, SP1 and PV1 are selected to be outputted.

5. The intelligent control system for cement grinding combination as claimed in claim 4 wherein, The control module further comprises: The constant weight bin bin weight is used as a control amount of the total feeding amount, and a controller is used to automatically adjust the feeding amount.

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