Method, device, equipment and readable storage medium for controlling flue gas oxygen concentration

Abstract

The present disclosure provides a method, device, equipment and readable storage medium for controlling flue gas oxygen concentration. The method includes: obtaining the current flue gas oxygen concentration value of the waste incinerator; comparing the flue gas oxygen concentration value with the maximum and minimum values ​​of a preset concentration threshold interval; and controlling the flue gas oxygen concentration of the waste incinerator by adjusting the operating parameters of the waste incinerator based on the comparison result and a pre-trained flue gas oxygen concentration control model; wherein the training samples of the flue gas oxygen concentration control model are data collected from the stable operation of the waste incinerator. The method automatically controls the operating parameters of the waste incinerator, avoids control relying on the personal experience of the operator, makes the waste incinerator run stably, and avoids frequent operations by the operator, reducing the workload.

Description

Background Art

[0002] Waste incineration has gradually developed into the main way for Chinese cities to deal with domestic waste due to its advantages of complete harmlessness, significant reduction and resource utilization. The control of the concentration of particulate matter, nitrogen oxides, sulfur dioxide, carbon monoxide and other emissions in the flue gas emitted by the incinerator is an important prerequisite for the application of waste incineration technology. In recent years, with the rapid development of the express delivery industry and the takeaway industry, the composition of domestic waste has changed dramatically. The original automatic control system of the waste incinerator cannot be effectively applied to the automatic combustion of existing waste, which will cause the combustion condition of the waste incinerator to be unstable.

[0003] The current waste incineration plants are equipped with specialized operators who rely on their personal experience to adjust the exhaust air volume, pusher speed, grate speed and other parameters of each section to ensure that the emission value of flue gas oxygen concentration of the incinerator meets the requirements of environmental protection indicators and operates safely and stably. However, this control method is highly dependent on the personal experience of the operators. The control strategies of different operators vary greatly. Unreasonable operation or untimely response will cause huge fluctuations in the combustion conditions. In addition, when the waste combustion conditions change, the operators need to perform a lot of frequent operations.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute relevant technology known to ordinary technicians in the field. Summary of the invention

[0005] The purpose of the present disclosure is to provide a method, device, equipment and readable storage medium for controlling flue gas oxygen concentration, which at least to a certain extent overcome the problem of being unable to automatically adjust the parameters of a waste incinerator due to the limitations of related technologies.

[0006] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

[0007] According to one aspect of the present disclosure, a method for controlling the flue gas oxygen concentration of a waste incinerator is provided, comprising: obtaining a current flue gas oxygen concentration value of the waste incinerator; comparing the flue gas oxygen concentration value with a maximum value and a minimum value of a preset concentration threshold interval; and controlling the flue gas oxygen concentration of the waste incinerator by adjusting operating parameters of the waste incinerator based on the comparison result and a pre-trained flue gas oxygen concentration control model; wherein the training samples of the flue gas oxygen concentration control model are data collected from when the waste incinerator is in stable operation.

[0008] In one embodiment of the present disclosure, based on the comparison result and a pre-trained flue gas oxygen concentration control model, the flue gas oxygen concentration of the waste incinerator is controlled by adjusting the operating parameters of the waste incinerator, including: when the flue gas oxygen concentration value is greater than the maximum value of the concentration threshold range, the thickness of the material layer of the waste incinerator is determined according to the layer thickness pressure difference of the material layer, and according to the thickness of the material layer, based on the flue gas oxygen concentration control model, the operating parameters are adjusted; and / or, when the flue gas oxygen concentration value is less than the minimum value of the concentration threshold range, the secondary fan frequency of the waste incinerator is detected, and according to the size of the secondary fan frequency, based on the flue gas oxygen concentration control model, the operating parameters are adjusted.

[0009] In one embodiment of the present disclosure, according to the thickness of the material layer and based on the flue gas oxygen concentration control model, adjusting the operating parameters includes: when the thickness of the material layer is within a preset range, detecting the secondary fan frequency of the waste incinerator; when the secondary fan frequency is lower than a low critical value, judging whether the garbage is fully burned in the combustion grate of the waste incinerator; when the combustion is sufficient, based on the flue gas oxygen concentration control model, reducing the opening of the lower primary air valve of the burnout grate in the operating parameters; when the combustion is incomplete, reducing at least one of the pusher speed, drying grate speed, combustion grate speed and burnout grate speed in the operating parameters, and increasing the opening of the lower primary air valve of the combustion grate to ensure sufficient combustion of the garbage; and / or, when the secondary fan frequency is higher than the low critical value, reducing the secondary fan frequency based on the flue gas oxygen concentration control model.

[0010] In one embodiment of the present disclosure, adjusting the operating parameters according to the thickness of the material layer and based on the flue gas oxygen concentration control model also includes: when the thickness of the material layer is greater than the preset range, based on the flue gas oxygen concentration control model, increasing the primary fan frequency in the operating parameters, or sending an instruction to control the waste incinerator to roll the material layer.

[0011] In one embodiment of the present disclosure, according to the thickness of the material layer and based on the flue gas oxygen concentration control model, adjusting the operating parameters also includes: when the thickness of the material layer is less than the preset range, increasing at least one of the pusher speed, drying grate speed, and combustion grate speed in the operating parameters.

[0012] In one embodiment of the present disclosure, according to the magnitude of the secondary fan frequency and based on the flue gas oxygen concentration control model, adjusting the operating parameters includes: when the secondary fan frequency is lower than a high critical value, increasing the secondary fan frequency based on the flue gas oxygen concentration control model; and / or, when the secondary fan frequency is higher than the high critical value, reducing the drying grate speed, the combustion grate speed and the burnout grate speed in the operating parameters to zero and maintaining them for a predetermined time; or, based on the flue gas oxygen concentration control model, increasing the opening of the primary air valve at the bottom of the burnout grate; wherein the predetermined time is determined based on the flue gas oxygen concentration control model.

[0013] In one embodiment of the present disclosure, the method further includes: acquiring data collected when the waste incinerator is in stable operation; preprocessing the data to remove abnormal data therein; and using the preprocessed data as training samples to train the flue gas oxygen concentration control model.

[0014] In one embodiment of the present disclosure, the flue gas oxygen concentration control model includes: a first model, a second model, a third model and a fourth model; wherein the first model is used to adjust the opening of the primary air valve at the bottom of the burnout grate in the operating parameters; the second model is used to adjust the primary fan frequency in the operating parameters; the third model is used to adjust the secondary fan frequency in the operating parameters; the fourth model is used to determine the pause time of the drying grate, combustion grate and burnout grate of the waste incinerator.

[0015] According to another aspect of the present disclosure, a control device for flue gas oxygen concentration in a waste incinerator is provided, comprising: a concentration value acquisition module, used to obtain the current flue gas oxygen concentration value of the waste incinerator; a concentration value comparison module, used to compare the flue gas oxygen concentration value with the maximum value and the minimum value of a preset concentration threshold range; and a concentration value control module, used to control the flue gas oxygen concentration of the waste incinerator by adjusting the operating parameters of the waste incinerator based on the comparison result and a pre-trained flue gas oxygen concentration control model; wherein the training samples of the flue gas oxygen concentration control model are data collected from the waste incinerator site.

[0016] According to another aspect of the present disclosure, a computer device is provided, comprising: a memory, a processor, and executable instructions stored in the memory and executable in the processor; wherein the processor implements the above-mentioned method for controlling the oxygen concentration of flue gas in a waste incinerator when executing the executable instructions.

[0017] According to another aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned method for controlling the oxygen concentration of flue gas in a waste incinerator is implemented.

[0018] The method for controlling the flue gas oxygen concentration of a waste incinerator provided in the embodiments of the present disclosure automatically controls the operating parameters of the waste incinerator based on the comparison result between the current flue gas oxygen concentration value and the maximum and minimum values ​​of the concentration threshold range, using a pre-trained flue gas oxygen concentration control model, thereby avoiding control relying on the personal experience of the operator, making the operation of the waste incinerator stable, and avoiding frequent operations by the operator, thereby reducing the workload.

[0019] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0021] Figure 1 A flow chart of a method for controlling oxygen concentration in flue gas of a waste incinerator in an embodiment of the present disclosure is exemplarily shown;

[0022] Figure 2 A flowchart of another method for controlling oxygen concentration in flue gas of a waste incinerator in an embodiment of the present disclosure is exemplarily shown;

[0023] Figure 3 A flow chart of another method for controlling oxygen concentration in flue gas of a waste incinerator is shown by way of example;

[0024] Figure 4 A flow chart of another method for controlling oxygen concentration in flue gas of a waste incinerator is shown by way of example;

[0025] Figure 5 A flow chart of another method for controlling oxygen concentration in flue gas of a waste incinerator is shown by way of example;

[0026] Figure 6 A flow chart of another method for controlling oxygen concentration in flue gas of a waste incinerator is shown by way of example;

[0027] Figure 7 A schematic diagram of a device for controlling oxygen concentration in flue gas of a waste incinerator according to an embodiment of the present disclosure is shown;

[0028] Figure 8 The following is a block diagram showing a structure of a computer device according to an embodiment of the present disclosure;

[0029] Fig. 9 A schematic diagram exemplarily shows a computer-readable storage medium in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0031] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0032] Hereinafter, each step of the method for controlling the oxygen concentration of flue gas in a waste incinerator provided by the exemplary embodiment of the present disclosure will be described in more detail with reference to the accompanying drawings and embodiments.

[0033] Figure 1 The flowchart of a method for controlling the oxygen concentration of flue gas in a waste incinerator in an embodiment of the present disclosure is exemplarily shown. The method provided in the embodiment of the present disclosure can be used to control the oxygen concentration of flue gas in any waste incinerator.

[0034] A garbage incinerator can be an incinerator that burns domestic garbage, industrial garbage or other combustible garbage. Flue gas oxygen concentration refers to the oxygen content in the flue gas generated when garbage in a garbage incinerator is burned.

[0035] refer to Figure 1 , the control method for the flue gas oxygen concentration of the garbage incinerator includes:

[0036] In step S400, the current flue gas oxygen concentration value of the garbage incinerator is obtained.

[0037] During the incineration of garbage, a large amount of flue gas will be generated. If the flue gas oxygen concentration is too high, the concentration of nitrogen oxides will increase. If the flue gas oxygen concentration is too low, the concentration of harmful gases such as carbon monoxide that are not fully burned will increase. In order to ensure that the concentration of nitrogen oxides and carbon monoxide and other gases meets national standards (such as GB18485-2014), the flue gas oxygen concentration needs to be controlled within a certain reasonable range. Too high or too low will cause abnormal working conditions and damage the environment. Therefore, it is necessary to detect the current flue gas oxygen concentration during garbage incineration at any time or regularly to determine whether it is within a reasonable range.

[0038] In step S500, the smoke oxygen concentration value is compared with the maximum value and the minimum value of a preset concentration threshold range.

[0039] Among them, the preset concentration threshold interval is a numerical interval, that is, the values ​​of the oxygen concentration in this interval are all in a reasonable range. The maximum and minimum values ​​of the concentration threshold interval can be determined by technicians in this field according to the model and actual situation of the waste incinerator, and are not specifically limited here. By comparing the current flue gas oxygen concentration value obtained with the maximum and minimum values ​​of the threshold interval, it can be determined whether the current flue gas oxygen concentration value is normal, so as to perform subsequent operations.

[0040] In step S600, based on the comparison result and the pre-trained flue gas oxygen concentration control model, the flue gas oxygen concentration of the waste incinerator is controlled by adjusting the operating parameters of the waste incinerator.

[0041] The comparison result is the result of comparing the current flue gas oxygen concentration value with the maximum and minimum values ​​of the concentration threshold interval. For example, assuming that the current flue gas oxygen concentration value is 0 2act , the preset concentration threshold interval is [O 2min , O 2max ], the comparison result is x. The specific value of x is: Let x1 = O 2act -O 2min If x1<0, then x=x1, indicating that the current flue gas oxygen concentration is O 2act If x1>0, then set x2=0. 2act -O 2max If x2>0, then x=x2, which means the current flue gas oxygen concentration value O 2act If x1>0 and x2<0, it means that the current flue gas oxygen concentration value is within the normal range and no control is needed for the time being.

[0042] The training samples of the flue gas oxygen concentration control model are the data collected from the stable operation of the waste incinerator, including the flue gas oxygen concentration value during the stable operation of the waste incinerator and the operating parameters collected corresponding to the flue gas oxygen concentration value, including the primary fan frequency F1, the secondary fan frequency F2, the pusher speed Vp, the drying grate speed Vd, the combustion grate speed Vc, the burnout grate speed Vo, the opening of the primary air valve at the bottom of the combustion grate Pco, the primary air valve at the bottom of the burnout grate Pav, etc. After training, the flue gas oxygen concentration control model is f n (x) = a n x+b n , where f n (x) is the value of a certain operating parameter, x is the comparison result between the current flue gas oxygen concentration value and the maximum and minimum values ​​of the concentration threshold range, a n and b n are model coefficients respectively, and n is a positive integer representing different types of operating parameters.

[0043] The specific process of training the model is to collect the value of a certain operating parameter f from the stable operation of the waste incinerator n (x) (such as the data of the secondary fan frequency F2), the collected data of the operating parameters (such as the secondary fan frequency F2) and the comparison result of the flue gas oxygen concentration are substituted into the f n (x) = a n x+b n , according to the training sample training to obtain the corresponding model coefficient a n and b n .

[0044] In the present disclosure, the flue gas oxygen concentration control model may include: a first model, a second model and a third model. The first model is f1(x)=a1x+b1, which is used to adjust the primary air valve opening Pav of the lower part of the burnout grate in the operating parameters, and a1 and b1 are the model coefficients obtained by training; the second model is f2(x)=a2x+b2, which is used to adjust the primary fan frequency F1 in the operating parameters, and a2 and b2 are the model coefficients obtained by training; the third model is f3(x)=a3x+b3, which is used to adjust the secondary fan frequency F2 in the operating parameters, and a3 and b3 are the model coefficients obtained by training.

[0045] The control model disclosed in the present invention is obtained through deep learning training based on a large amount of field operation data. The model incorporates the rich and efficient operation experience of field operators, and has high model accuracy and strong applicability. The system greatly reduces the on-site work intensity of operators and improves the stability and automation of field operation.

[0046] Therefore, after the flue gas oxygen concentration control model is trained, the comparison result x can be substituted into the model to obtain the value of a certain operating parameter, and the current operating parameter is adjusted to the value so that the flue gas oxygen concentration is at a normal threshold. Therefore, the above technical solution disclosed in the present invention can realize automatic control of the flue gas oxygen concentration of the garbage incinerator without relying on the personal experience of the operator, improve the automatic combustion control of the garbage incinerator, realize automatic and stable operation of garbage incineration, meet environmental protection indicators, avoid frequent operations of operators, and reduce the workload of operators.

[0047] Figure 2 A flowchart of another method for controlling the oxygen concentration of flue gas in a waste incinerator in an embodiment of the present disclosure is shown by way of example. Figure 1 The difference between the methods shown is that Figure 2 The method shown further shows a specific embodiment of step S600, including:

[0048] In step S610, when the flue gas oxygen concentration value is greater than the maximum value of the concentration threshold range, the thickness of the material layer is determined according to the layer thickness pressure difference of the material layer of the waste incinerator, and the operating parameters are adjusted according to the thickness of the material layer based on the above-mentioned flue gas oxygen concentration control model.

[0049] In step S620, when the flue gas oxygen concentration value is less than the minimum value of the concentration threshold interval, the secondary fan frequency F2 of the waste incinerator is detected, and the operating parameters are adjusted according to the secondary fan frequency F2 based on the flue gas oxygen concentration control model.

[0050] In some embodiments, when it is detected that the flue gas oxygen concentration value is greater than the maximum value in the concentration threshold interval, step S610 is executed to adjust the operating parameters based on the flue gas oxygen concentration control model according to the thickness of the material layer. When it is detected that the flue gas oxygen concentration value is less than the minimum value in the concentration threshold interval, step S620 is executed to adjust the operating parameters based on the flue gas oxygen concentration control model according to the secondary fan frequency F2.

[0051] Figure 3 A flowchart of another method for controlling the oxygen concentration of flue gas in a waste incinerator in an embodiment of the present disclosure is shown by way of example. Figure 2 The difference between the methods shown is that Figure 3 The method shown further shows a specific embodiment of step S610, including:

[0052] In step S611, when the thickness of the material layer is within a preset range, the secondary fan frequency F2 of the waste incinerator is detected.

[0053] Also refer to Figure 4 ,and Figure 3 The difference between the methods shown is that Figure 4The method shown further shows a specific embodiment of step S611, including:

[0054] In step S6111, when the secondary fan frequency F2 is lower than the low critical value, it is determined whether the garbage is fully burned in the combustion grate of the garbage incinerator; when the combustion is sufficient, based on the flue gas oxygen concentration control model f1(x)=a1x+b1, the lower primary air valve opening Pav of the burnout grate in the operating parameters is reduced, wherein a1 and b1 are model coefficients determined according to the training sample training; when the combustion is not sufficient, at least one of the pusher speed Vp, the drying grate speed Vd, the combustion grate speed Vc and the burnout grate speed Vo in the operating parameters is reduced, and the lower primary air valve opening Pco of the combustion grate is increased to ensure sufficient combustion of the garbage.

[0055] In step S6112, when the secondary fan frequency F2 is higher than the low critical value, the secondary fan frequency F2 is adjusted based on the flue gas oxygen concentration control model f3(x)=a3x+b3 to reduce the secondary fan frequency F2, wherein a3 and b3 are model coefficients determined according to training samples.

[0056] The preset range of the material layer refers to the normal range of the material layer when the waste incinerator is burning. The thickness of the material layer within the normal range is conducive to the incineration of waste, and then to the stable operation of the waste incinerator. Those skilled in the art can set it according to the actual operation of the waste incinerator, and this disclosure does not limit it. It should be noted that in step S6111, "full combustion" is to judge that there is no large amount of garbage to be burned on the top of the burnout grate based on the temperature value of the top of the combustion grate.

[0057] The low critical value of the secondary fan frequency F2 can be set according to actual applications, and the present disclosure does not limit this.

[0058] In step S612, when the thickness of the material layer is greater than the preset range, that is, the material layer is too thick and the combustion process is slow, the primary fan frequency F1 can be adjusted based on the flue gas oxygen concentration control model f2(x)=a2x+b2, and the primary fan frequency F1 in the operating parameters can be increased to promote the combustion of the combustion grate, thereby reducing the flue gas oxygen concentration, where a2 and b2 are model coefficients determined according to training samples; or, send instructions to control the waste incinerator to roll the material layer to promote the combustion of waste on the combustion grate.

[0059] In step S613, when the thickness of the material layer is less than the preset range, the material layer is too thin and there is a serious shortage of material. The primary air is directly discharged from the furnace without being burned, causing the oxygen concentration of the flue gas to rise. At this time, at least one of the pusher speed Vp, drying grate speed Vd, and combustion grate speed Vc in the operating parameters is increased to promote the increase of the amount of material above the grate, so that the primary air is fully burned, thereby reducing the oxygen concentration of the flue gas.

[0060] When the material layer thickness is in different ranges, through the above steps S611 to S613, the corresponding operating parameters are automatically controlled, and the flue gas oxygen concentration is controlled to be within the concentration threshold range, thereby realizing automatic control of the flue gas oxygen concentration.

[0061] Figure 5 A flowchart of another method for controlling the oxygen concentration of flue gas in a waste incinerator in an embodiment of the present disclosure is shown by way of example. Figure 3 The difference between the methods shown is that Figure 5 The method shown further shows a specific embodiment of step S620, including:

[0062] In step S621, when the secondary fan frequency F2 is lower than the high critical value, the secondary fan frequency F2 is adjusted based on the flue gas oxygen concentration control model f3(x)=a3x+b3, and the secondary fan frequency F2 is increased, thereby increasing the secondary air volume and increasing the flue gas oxygen concentration.

[0063] In step S622, when the secondary fan frequency F2 is higher than the high critical value, the drying grate speed Vd, the combustion grate speed Vc and the burnout grate speed Vo are reduced to zero and maintained for a predetermined time; or, based on the flue gas oxygen concentration control model f1(x)=a1x+b1, the opening degree Pav of the primary air valve at the bottom of the burnout grate is increased to increase the flue gas oxygen concentration.

[0064] Among them, the flue gas oxygen concentration control model disclosed in the present invention also includes a fourth model f4(x), which is used to determine the pause time (i.e. the above-mentioned scheduled time) of the drying grate, combustion grate, and burnout grate of the waste incinerator. f4(x) represents the above-mentioned scheduled time. f4(x) is a trained neural network model, and the input variable x is the comparison value of the current flue gas oxygen concentration value and the maximum and minimum values ​​of the concentration threshold interval (see the comparison process in the above embodiment), and the output value of f4(x) corresponds to the pause time (i.e. the above-mentioned scheduled time) of the drying grate, combustion grate, and burnout grate, respectively, and the hidden layer is one layer, the number of nodes selected is 6, and the optimizer is Adam.

[0065] In addition, refer to Figure 6 The method for controlling the oxygen concentration of flue gas in a waste incinerator in the present disclosure may further include the following steps before step S400:

[0066] In step S100, data collected during the stable operation of the waste incinerator are obtained, and the data include the current flue gas oxygen concentration value, the primary fan frequency F1, the secondary fan frequency F2, the pusher speed Vp, the drying grate speed Vd, the combustion grate speed Vc, the burnout grate speed Vo, the opening degree Pco of the primary air valve at the bottom of the combustion grate, the opening degree Pav of the primary air valve at the bottom of the burnout grate, etc.

[0067] In step S200, the above data is preprocessed to remove abnormal data.

[0068] In step S300, the preprocessed data is used as training samples to train the flue gas oxygen concentration control model.

[0069] For a clearer explanation, please refer to Figure 6 , which exemplarily shows the process of another specific control method in the above embodiment of the present disclosure.

[0070] First, the current flue gas oxygen concentration value of the waste incinerator is obtained (step S400).

[0071] Then, the smoke oxygen concentration value is compared with the maximum value and the minimum value of the preset concentration threshold interval (step S500) to obtain a comparison result.

[0072] When the flue gas oxygen concentration value is greater than the maximum value of the concentration threshold interval, the thickness of the material layer is determined. When the thickness of the material layer is within the preset range, the secondary fan frequency F2 of the garbage incinerator is detected; after detection, when the secondary fan frequency F2 is lower than the low critical value and the garbage is fully burned, the lower primary air valve opening Pav of the burnout grate in the operating parameters is reduced based on f1(x)=a1x+b1. When the garbage is not fully burned, at least one of the pusher speed Vp, drying grate speed Vd, combustion grate speed Vc and burnout grate speed Vo in the operating parameters is reduced, and the lower primary air valve opening Pco of the combustion grate is increased; when the secondary fan frequency F2 is higher than the low critical value, the secondary fan frequency F2 is reduced based on f3(x)=a3x+b3. When the thickness of the material layer is greater than the preset range, the primary fan frequency F1 is increased or the material layer is rolled based on f2(x)=a2x+b2. When the thickness of the material layer is less than a preset range, at least one of the pusher speed Vp, the drying grate speed Vd, and the combustion grate speed Vc is increased.

[0073] When the flue gas oxygen concentration value is less than the minimum value of the concentration threshold interval, the secondary fan frequency F2 is detected. When the secondary fan frequency F2 is lower than the high critical value, based on f3(x)=a3x+b3, the secondary fan frequency F2 is increased; when the secondary fan frequency F2 is higher than the high critical value, the drying grate speed Vd, the combustion grate speed Vc and the burnout grate speed Vo are reduced to zero and maintained for a predetermined time, or, based on f1(x)=a1x+b1, the opening degree Pav of the primary air valve at the bottom of the burnout grate is increased.

[0074] In addition, it should be noted that the above figures are only schematic illustrations of the processes included in the method according to the exemplary embodiment of the present disclosure, and are not intended to be limiting. It is easy to understand that the processes shown in the above figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0075] Please refer to the following results of controlling flue gas oxygen concentration using the above control method during actual garbage incineration.

[0076] The current flue gas outlet oxygen content (current flue gas oxygen concentration) collected is 10.7%, which seriously exceeds the normal stable operation range. At this time, the secondary fan frequency is 4.7HZ, the primary fan frequency is 24.1HZ, the primary air valve opening of the lower part of the combustion grate section 1 is 90%, the primary air valve opening of the lower part of the combustion grate section 2 is 70%, the primary air valve opening of the lower part of the combustion grate section 3 is 20%, and the primary air valve opening of the lower part of the burnout grate section 1 is 30%. In order to reduce the outlet oxygen content to the normal operating range, through the above method, the primary fan frequency is increased to 31%, the primary air valve opening of the lower part of the combustion grate section 1 and the combustion grate section 2 is increased to 100%, the primary air valve opening of the lower part of the combustion grate section 3 is increased to 72%, and the primary air of the lower part of the burnout grate section 1 is reduced to 0%, ensuring full combustion of the combustion section, thereby reducing the oxygen content to 4.8%.

[0077] When the current flue gas outlet oxygen content is collected to be 2.6% (current flue gas oxygen concentration), which is lower than the normal stable operation range. At this time, the secondary fan frequency is 4.7HZ, the primary fan frequency is 28.9HZ, the lower primary air valve opening of the first combustion grate is 82.5%, the lower primary air valve opening of the second and third combustion grate is 100%, the lower primary air valve opening of the first burnout grate is 35%, and the upper temperature of the burnout grate reaches 787.7℃, indicating that there is a large amount of garbage to be burned on the combustion section and the burnout section grate. At this time, the secondary fan frequency is adjusted to 26HZ, the lower primary air valve opening of the first burnout grate is 100%, and the oxygen content rises to 4.6%, restoring the normal operating value.

[0078] As described above, the present invention automatically controls the operating parameters of the waste incinerator through training the control model based on the comparison results of the current flue gas oxygen concentration value and the maximum and minimum values ​​of the concentration threshold interval, thereby avoiding control relying on the operator's personal experience, making the operation of the waste incinerator stable, and avoiding frequent operations of the operator, thereby reducing the workload.

[0079] The following are embodiments of the device disclosed herein, which can be used to execute the method embodiments disclosed herein. For details not disclosed in the device embodiments disclosed herein, please refer to the method embodiments disclosed herein.

[0080] Figure 7 A block diagram of a device for controlling oxygen concentration in flue gas from a waste incinerator in an embodiment of the present disclosure is exemplarily shown.

[0081] refer to Figure 7 The control device 70 includes: a concentration value acquisition module 720, a concentration value comparison module 740 and a concentration value control module 760.

[0082] The concentration value acquisition module 720 is used to obtain the current flue gas oxygen concentration value of the waste incinerator.

[0083] The concentration value comparison module 740 is used to compare the smoke oxygen concentration value with the maximum value and the minimum value of the preset concentration threshold interval.

[0084] The concentration value control module 760 is used to control the flue gas oxygen concentration of the waste incinerator by adjusting the operating parameters of the waste incinerator based on the comparison result and the pre-trained flue gas oxygen concentration control model. The training samples of the flue gas oxygen concentration control model are data collected from the waste incinerator site.

[0085] In some embodiments, the concentration value control module 720 includes: a material layer thickness determination unit, a parameter adjustment unit and a secondary fan frequency detection unit. The material layer thickness determination unit is used to determine the thickness of the material layer according to the layer thickness pressure difference of the material layer of the waste incinerator when the flue gas oxygen concentration value is greater than the maximum value of the concentration threshold interval; the parameter adjustment unit is used to adjust the operating parameters according to the thickness of the material layer based on the flue gas oxygen concentration control model.

[0086] In some embodiments, the secondary fan frequency detection unit is used to detect the secondary fan frequency F2 of the waste incinerator when the flue gas oxygen concentration value is less than the minimum value of the concentration threshold interval, and the parameter adjustment unit is used to adjust the operating parameters according to the size of the secondary fan frequency F2 based on the flue gas oxygen concentration control model.

[0087] In some embodiments, the secondary fan frequency detection unit can also be used to detect the secondary fan frequency F2 of the garbage incinerator when the thickness of the material layer is within a preset range. The concentration value control module 760 also includes: a combustion judgment unit, which is used to judge whether the garbage is fully burned in the combustion grate of the garbage incinerator when the secondary fan frequency F2 is lower than the low critical value; when the combustion is sufficient, the operating parameter adjustment unit is used to reduce the opening Pav of the primary air valve at the bottom of the burnout grate in the operating parameters based on the flue gas oxygen concentration control model; when the combustion is not sufficient, the operating parameter adjustment unit is used to reduce at least one of the pusher speed Vp, drying grate speed Vd, combustion grate speed Vc and burnout grate speed Vo in the operating parameters, and increase the opening Pco of the primary air valve at the bottom of the combustion grate.

[0088] In some embodiments, the secondary fan frequency detection unit can also be used to detect the secondary fan frequency F2 of the waste incinerator when the thickness of the material layer is within a preset range. When the secondary fan frequency F2 is higher than the low critical value, the operating parameter adjustment unit reduces the secondary fan frequency F2 based on the flue gas oxygen concentration control model.

[0089] In some embodiments, the operating parameter adjustment unit can also be used to increase the primary fan frequency F1 in the operating parameters based on the flue gas oxygen concentration control model when the thickness of the material layer is greater than a preset range, or send instructions to control the waste incinerator to roll the material layer.

[0090] In some embodiments, the operating parameter adjustment unit can also be used to increase at least one of the pusher speed Vp, drying grate speed Vd, and combustion grate speed Vc in the operating parameters when it is determined that the thickness of the material layer is less than a preset range.

[0091] In some embodiments, the secondary fan frequency detection unit can also be used to detect the secondary fan frequency F2 of the waste incinerator when the flue gas oxygen concentration value is less than the minimum value of the concentration threshold interval. The operation parameter adjustment unit can also be used to increase the secondary fan frequency F2 based on the flue gas oxygen concentration control model when the secondary fan frequency F2 is lower than the high critical value; when the secondary fan frequency F2 is higher than the high critical value, the drying grate speed Vd, the combustion grate speed Vc and the burnout grate speed Vo are reduced to zero and maintained for a predetermined time; or, based on the flue gas oxygen concentration control model, the primary air valve opening at the bottom of the burnout grate is increased. The predetermined time is determined based on the flue gas oxygen concentration control model.

[0092] In some embodiments, the control device 70 may further include: a data acquisition module 770 , a data preprocessing module 780 and a model training module 790 .

[0093] The data acquisition module 770 is used to acquire data collected when the waste incinerator is running stably.

[0094] The data preprocessing module 780 is used to preprocess the data to remove abnormal data.

[0095] The model training module 790 is used to train the flue gas oxygen concentration control model using the preprocessed data as training samples.

[0096] The flue gas oxygen concentration control model includes: the first model, the second model, the third model and the fourth model. The first model is used to adjust the opening Pav of the primary air valve at the bottom of the burnout grate in the operating parameters; the second model is used to adjust the primary fan frequency F1 in the operating parameters; the third model is used to adjust the secondary fan frequency F2 in the operating parameters; the fourth model is used to determine the pause time of the drying grate, the combustion grate and the burnout grate of the garbage incinerator.

[0097] The control device for the flue gas oxygen concentration of a waste incinerator provided in the embodiment of the present disclosure controls the operating parameters of the waste incinerator based on the comparison result of the current flue gas oxygen concentration value and the maximum and minimum values ​​of the concentration threshold range through training the control model, thereby avoiding control relying on the personal experience of the operator, making the operation of the waste incinerator stable, avoiding frequent operations of the operator, and reducing the workload.

[0098] It should be noted that the block diagrams shown in the above figures are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0099] Those skilled in the art will appreciate that various aspects of the present disclosure may be implemented as systems, methods or program products. Therefore, various aspects of the present disclosure may be specifically implemented in the following forms, namely: complete hardware implementation, complete software implementation (including firmware, microcode, etc.), or a combination of hardware and software, which may be collectively referred to herein as "circuits", "modules" or "systems".

[0100] Refer to the following Figure 8 hereinafter, a computer device 800 according to this embodiment of the present invention is described. Figure 8 The computer device 800 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0101] like Figure 8As shown, the computer device 800 is in the form of a general computing device. The components of the computer device 800 may include, but are not limited to: at least one processing unit 810, at least one storage unit 820, and a bus 830 connecting different system components (including the storage unit 820 and the processing unit 810).

[0102] The storage unit 820 stores program codes, which can be executed by the processing unit 810, so that the processing unit 810 performs the steps according to various exemplary embodiments of the present invention described in the above “Exemplary Method” section of this specification. For example, the processing unit 810 can perform the following steps: Figure 1 In step S400, the current flue gas oxygen concentration value of the waste incinerator is obtained; in step S500, the flue gas oxygen concentration value is compared with the maximum and minimum values ​​of a preset concentration threshold range; in step S600, based on the comparison result and a pre-trained flue gas oxygen concentration control model, the flue gas oxygen concentration of the waste incinerator is controlled by adjusting the operating parameters of the waste incinerator.

[0103] The storage unit 820 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM) 8201 and / or a cache memory unit 8202 , and may further include a read-only memory unit (ROM) 8203 .

[0104] The storage unit 820 may also include a program / utility 8204 having a set (at least one) of program modules 8205, such program modules 8205 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0105] Bus 830 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0106] The computer device 800 may also communicate with one or more external devices 700 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may also communicate with one or more devices that enable a user to interact with the computer device 800, and / or communicate with any device that enables the computer device 800 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface 850. Furthermore, the computer device 800 may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via a network adapter 860. As shown, the network adapter 860 communicates with other modules of the computer device 800 via a bus 830. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the computer device 800, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0107] Through the description of the above implementation, it is easy for those skilled in the art to understand that the example implementation described here can be implemented by software, or by software combined with necessary hardware. Therefore, the technical solution according to the implementation of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the implementation of the present disclosure.

[0108] In an exemplary embodiment of the present disclosure, a computer-readable storage medium is also provided, on which a program product capable of implementing the above method of the present specification is stored. In some possible implementations, various aspects of the present invention can also be implemented in the form of a program product, which includes a program code, and when the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps according to various exemplary embodiments of the present invention described in the above "Exemplary Method" section of the present specification.

[0109] refer to Fig. 9 As shown, a program product 900 for implementing the above method according to an embodiment of the present invention is described, which can adopt a portable compact disk read-only memory (CD-ROM) and include program code, and can be run on a terminal device, such as a personal computer. However, the program product of the present invention is not limited thereto. In this document, a readable storage medium can be any tangible medium containing or storing a program, which can be used by or in combination with an instruction execution system, an apparatus or a device.

[0110] The program product may use any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable 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 above.

[0111] Computer readable signal media may include data signals propagated in baseband or as part of a carrier wave, in which readable program code is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Readable signal media may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0112] The program code embodied on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the foregoing.

[0113] Program code for performing the operations of the present invention may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., through the Internet using an Internet service provider).

[0114] It should be noted that, although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into multiple modules or units to be embodied.

[0115] In addition, although the steps of the method in the present disclosure are described in a specific order in the drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0116] Through the description of the above implementation, it is easy for those skilled in the art to understand that the example implementation described here can be implemented by software, or by software combined with necessary hardware. Therefore, the technical solution according to the implementation of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the implementation of the present disclosure.

[0117] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A method for controlling oxygen concentration in flue gas from a waste incinerator, characterized in that: The method comprises: Obtaining the current flue gas oxygen concentration value of the waste incinerator; Comparing the flue gas oxygen concentration value with the maximum and minimum values ​​of a preset concentration threshold interval; and Based on the comparison result and the pre-trained flue gas oxygen concentration control model, the flue gas oxygen concentration of the waste incinerator is controlled by adjusting the operating parameters of the waste incinerator, wherein the flue gas oxygen concentration control model includes a first model, a second model and a third model, the first model is used to adjust the opening of the primary air valve at the lower part of the burnout grate in the operating parameters; the second model is used to adjust the primary fan frequency in the operating parameters; the third model is used to adjust the secondary fan frequency in the operating parameters; Wherein, the training samples of the flue gas oxygen concentration control model are data collected from the stable operation of the waste incinerator; Wherein, based on the comparison result and the pre-trained flue gas oxygen concentration control model, by adjusting the operating parameters of the waste incinerator, the flue gas oxygen concentration of the waste incinerator is controlled, including: When the flue gas oxygen concentration value is greater than the maximum value of the concentration threshold interval, determining the thickness of the material layer according to the layer thickness pressure difference of the material layer of the waste incinerator; When the thickness of the material layer is within a preset range, the secondary fan frequency of the waste incinerator is detected; when the secondary fan frequency is lower than the low critical value, it is determined whether the garbage is fully burned in the combustion grate of the waste incinerator; when the combustion is sufficient, based on the first model, the opening of the lower primary air valve of the burnout grate in the operating parameters is reduced; when the combustion is incomplete, at least one of the pusher speed, drying grate speed, combustion grate speed and burnout grate speed in the operating parameters is reduced, and the opening of the lower primary air valve of the combustion grate is increased to ensure sufficient combustion of the garbage; when the secondary fan frequency is higher than the low critical value, based on the third model, the secondary fan frequency is reduced; When the thickness of the material layer is greater than the preset range, based on the second model, the primary fan frequency in the operating parameters is increased, or an instruction is sent to control the waste incinerator to roll the material layer; When the thickness of the material layer is less than the preset range, at least one of the pusher speed, the drying grate speed, and the combustion grate speed in the operating parameters is increased; When the flue gas oxygen concentration value is less than the minimum value of the concentration threshold interval, detecting the secondary fan frequency of the waste incinerator; When the secondary fan frequency is lower than a high critical value, increasing the secondary fan frequency based on the third model; When the secondary fan frequency is higher than the high critical value, the drying grate speed, combustion grate speed and burnout grate speed in the operating parameters are reduced to zero and maintained for a predetermined time; or, based on the first model, the opening degree of the primary air valve at the bottom of the burnout grate is increased.

2. The method according to claim 1, characterized in that: Also includes: Acquire data collected when the waste incinerator is in stable operation; Preprocessing the data to remove abnormal data; as well as The preprocessed data is used as training samples to train the flue gas oxygen concentration control model.

3. The method according to claim 2, characterized in that The flue gas oxygen concentration control model further includes a fourth model; the predetermined time is determined based on the flue gas oxygen concentration control model; The fourth model is used to determine the pause time of the drying grate, the burning grate and the burnout grate of the waste incinerator, that is, the predetermined time.

4. A control device for flue gas oxygen concentration in a garbage incinerator, characterized in that: include: A concentration value acquisition module, used to obtain the current flue gas oxygen concentration value of the waste incinerator; A concentration value comparison module, used for comparing the flue gas oxygen concentration value with the maximum value and the minimum value of a preset concentration threshold interval; as well as A concentration value control module, for controlling the flue gas oxygen concentration of the waste incinerator by adjusting the operating parameters of the waste incinerator based on the comparison result and a pre-trained flue gas oxygen concentration control model, wherein the flue gas oxygen concentration control model includes a first model, a second model and a third model, the first model is used to adjust the opening of the primary air valve at the lower part of the burnout grate in the operating parameters; the second model is used to adjust the primary fan frequency in the operating parameters; the third model is used to adjust the secondary fan frequency in the operating parameters; Wherein, the training samples of the flue gas oxygen concentration control model are data collected from the waste incinerator site; Wherein, the concentration value control module is used for: When the flue gas oxygen concentration value is greater than the maximum value of the concentration threshold interval, determining the thickness of the material layer according to the layer thickness pressure difference of the material layer of the waste incinerator; When the thickness of the material layer is within a preset range, the secondary fan frequency of the waste incinerator is detected; when the secondary fan frequency is lower than the low critical value, it is determined whether the garbage is fully burned in the combustion grate of the waste incinerator; when the combustion is sufficient, based on the first model, the opening of the lower primary air valve of the burnout grate in the operating parameters is reduced; when the combustion is incomplete, at least one of the pusher speed, drying grate speed, combustion grate speed and burnout grate speed in the operating parameters is reduced, and the opening of the lower primary air valve of the combustion grate is increased to ensure sufficient combustion of the garbage; when the secondary fan frequency is higher than the low critical value, based on the third model, the secondary fan frequency is reduced; When the thickness of the material layer is greater than the preset range, based on the second model, the primary fan frequency in the operating parameters is increased, or an instruction is sent to control the waste incinerator to roll the material layer; When the thickness of the material layer is less than the preset range, at least one of the pusher speed, the drying grate speed, and the combustion grate speed in the operating parameters is increased; When the flue gas oxygen concentration value is less than the minimum value of the concentration threshold interval, detecting the secondary fan frequency of the waste incinerator; When the secondary fan frequency is lower than a high critical value, increasing the secondary fan frequency based on the third model; When the secondary fan frequency is higher than the high critical value, the drying grate speed, combustion grate speed and burnout grate speed in the operating parameters are reduced to zero and maintained for a predetermined time; or, based on the first model, the opening degree of the primary air valve at the bottom of the burnout grate is increased.

5. A computer device comprising: A memory, a processor, and executable instructions stored in the memory and executable in the processor, wherein the processor implements the method according to any one of claims 1 to 3 when executing the executable instructions.

6. A computer-readable storage medium having computer-executable instructions stored thereon, characterized in that: When the executable instructions are executed by a processor, the method according to any one of claims 1 to 3 is implemented.

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