JP7120105B2 - Control parameter determination support device and control parameter determination support method for combustion control device of waste incinerator - Google Patents

Description

The present invention relates to a control parameter determination support device and a control parameter determination support method for a combustion control device for a waste incinerator.

The waste incinerator has a waste input port on the upper upstream side of the furnace body, which is the waste supply side, an ash drop port for ash after incineration on the lower downstream side, and an exhaust gas port (furnace outlet) on the upper downstream side. At the bottom of the furnace, a fire grate is provided for conveying the waste from the upstream side to the downstream side. Each receives cooling air to lower and protect the ceiling.

Such waste incinerators are operated and managed under the control of a control device based on the incinerated amount and properties of waste in order to stabilize combustion in the furnace and detoxify the exhaust gas emitted outside the furnace. It is

In the operation management of waste incinerators, in order to stabilize combustion, harmful substances such as CO and NOx in the exhaust gas discharged from the incinerator are controlled below the regulation value, and the amount of incineration is secured as planned. It is most important to When the incinerator is operated manually, the incinerator operator can change the operating variables such as combustion air volume, grate feed speed, cooling air volume, etc. according to the ever-changing combustion condition due to changes in waste quality. I am letting Thus, in the case of manual operation, it is necessary to constantly monitor changes in the state of the incinerator, which increases the burden on the operator. In addition, since the adjustment of the operation amount differs depending on the individual difference of the operator and the combustion state may change, for example, as in Patent Document 1, a system that can switch to an automatic combustion control device instead of manual operation has been introduced. there is

In Patent Literature 1, instead of manual operation by an operator for operation and management of the waste incinerator, computer control by an automatic combustion control device is used to improve combustion performance and combustion stability.

In this patent document 1, the automatic combustion control device performs control based on an in-furnace combustion model, and automatically changes each operation amount of each operation end according to the combustion state. The manipulated variables include combustion air amount, cooling air amount, waste feeder feed rate, grate feed rate, and the like.

The automatic combustion control device determines the manipulated variable for each control element from the state quantity in the furnace (combustion state information, combustion process value information) by a predetermined control algorithm (PID control, fuzzy calculation, etc.). Specifically, rules and relational expressions have been created for the relationship between the state quantities in the furnace and the manipulated variables of each operating element. It's like

In the automatic combustion control device, once the target amount (weight) of the waste to be incinerated (garbage) to be put into the incinerator is set, the waste quality is calculated, and based on this, the reference value for each control element is determined. and make corrections according to the conditions inside the furnace during incineration. That is, the automatic combustion control device controls the incinerator by having the following functions (1) to (3).

<Main functions of the automatic combustion control device>
(1) Waste quality calculation: According to the setting of the target amount of waste incineration, plan the amount of heat input (heat amount of heating air for combustion, etc.), the amount of heat discharged from the furnace, and the amount of heat recovered and recovered as steam Calculate the lower calorific value of the waste based on the value. This calculation is called garbage composition calculation.

(2) Manipulated amount control for long-term fluctuations: Based on the target waste incineration amount and the target lower heating value (target waste quality calculation value), the reference value for each operation terminal calculated based on a predetermined relational expression. Based on this, control is performed so that the manipulated variable of each manipulator is set to the reference value. By controlling the grate feed speed, combustion air volume, etc. to the reference value, control is performed according to long-term fluctuations such as seasonal fluctuations in waste quality and fluctuations in the amount of incinerated waste.

(3) Control for short-term fluctuations: While controlling the manipulated variable of each manipulator to a reference value, further control is performed according to the conditions inside the furnace. At that time, the data for each process value that fluctuates due to combustion is monitored, and in order to suppress the amount of fluctuation within a predetermined range, various reference values are increased or decreased by a predetermined control algorithm according to the fluctuation of each process value to make corrections. do. This correction calculation result is output as an optimum control value. Basically, when the furnace is stable, it is operated under the control of (2) above, and combustion is stabilized under the correction by (3) for process variable fluctuations due to short-term fluctuations. do

The purpose of the control by the automatic combustion control device in this way is to reduce the burden on the operator, suppress fluctuations in the combustion of waste, stabilize combustion, and stabilize the amount of heat generated in the furnace, thereby stabilizing the amount of heat such as steam. To stabilize the amount of heat recovered and promote the effective use of heat.

As mentioned above, the automatic combustion control device is designed to change the waste quality and incineration amount so that the operation amount reference value of each control element changes in response to changes in the waste quality and incineration amount, which are long-term fluctuations. Based on this, rules and relational expressions for deriving the reference value of the manipulated value of each operating terminal are set corresponding to each operating terminal, and the rules and relational expressions have variables (called control parameters) that can be set and changed. there is

At the start of operation (operation) after construction of an incinerator equipped with such an automatic combustion control device, planned or planned waste will Set and adjust the control parameters of each control element according to the quality and amount of incineration. The setting and adjustment of control parameters are carried out by professional technicians and skilled operators who set and adjust appropriate values while looking at past performance, combustion conditions in the furnace, and the like.

The incinerator is operated by adjusting and setting the control parameters of the rules and relational expressions that lead to such manipulated variables. After that, as tuning of the automatic combustion control device to respond to changes in the incineration operating conditions of the incinerator and changes in the incineration characteristics of the incinerator, by adjusting the control parameters that can be set, the incinerator can be stabilized. I am adjusting it so that I can drive. Changes in the incineration operating conditions of the incinerator include changes in the type and properties of the waste to be incinerated, changes in the set amount of steam generation as heat recovery in waste incineration, mass balance in waste incineration in the incinerator, heat There are changes in conditions for setting income and expenditure. Changes in incineration characteristics of incinerators include changes in incineration characteristics caused by aging from the start of operation of the incinerator. amount, etc.) and changes in factors that affect combustion stability.

In the adjustment of the control parameters in such an automatic combustion control system, it is necessary for an incinerator operator to be skilled in determining which control parameters should be changed to what extent and, if changed, whether or not the change was effective. performed by a qualified operator. In addition, usually, a plurality of control parameters are changed in one adjustment work, and the order of the parameters to be changed is also an operator's know-how. In this way, it is the operator who determines how the state of combustion, especially the stability of combustion, changes when the control parameters are changed, and judges whether the change is effective or not. There will be individual differences in the evaluation of the combustion state (stability) depending on the strength and ability. Therefore, in order to minimize the influence of such individual differences, when adjusting the control parameters, it is necessary to appropriately change the control parameters without accompanying individual differences in the evaluation of the adjustment content and post-adjustment combustion state. becomes necessary. Patent Document 2 discloses an apparatus for evaluating the combustion state and the degree of combustion stability when control parameters are changed.

Patent Document 2 discloses that an evaluation device for a waste incinerator combustion control device compares a predetermined combustion state evaluation index with evaluation criteria to evaluate the adequacy of control parameter adjustment. It is According to this patent document 2, it is possible to evaluate the propriety of the control parameter by an objective evaluation index, and from the value of each evaluation index, it is possible to determine a specific inappropriate item, so the control parameter to be readjusted is identified.

Further, Patent Literature 3 discloses that the operating status of a plant is determined using a knowledge base, and diagnostic results that serve as indicators for operating targets and changes in operating conditions are displayed as knowledge data. According to this Patent Document 3, a knowledge base preset based on the experience of workers is used for the data acquired from the plant, and the current situation when changing the operation target value and operating conditions of the plant. By displaying diagnostic results, which serve as indices for evaluating the operator, as knowledge data, it is possible to change operating target values and operating conditions based on a unified standard regardless of the operator's skill level.

JP 2004-092941 JP 2015-114040 JP 2000-284826

However, Patent Literature 2 does not disclose details of control parameter adjustment, such as selecting a specific control parameter to be adjusted and how (to what extent) the adjustment should be performed. In addition, in Patent Document 3, the knowledge base is a knowledge base of values and transition trends for each parameter. The change order is not disclosed.

In view of such circumstances, the present invention uses an automatic combustion control device to control combustion stabilization in a waste incinerator that incinerates waste, and responds to changes in the type and properties of waste and changes in the amount of waste to be incinerated. When controlling automatic combustion by adjusting the control parameters used in the rules and relational expressions that are set to derive and change the manipulated variable of each control terminal, the adjustment details of the control parameters are selected appropriately. Furthermore, a control parameter for a combustion control device for a waste incinerator that can evaluate the combustion state after adjustment when selecting the adjustment content of the control parameter, and can judge the quality of the adjustment content of the control parameter. An object of the present invention is to provide a decision support device and a control parameter decision support method.

According to the present invention, the above-mentioned problems are solved by: It is solved by the control parameter determination support method.

In the present invention, terms are defined as follows.
(1) Knowledge data Data linking control parameter adjustment history and combustion state evaluation after adjustment (2) Knowledge base Database constructed with knowledge data (3) Similar knowledge data Knowledge data included in the knowledge base knowledge data whose degree of similarity with the evaluation of the combustion state when changing the control parameter exceeds a predetermined threshold

<First Invention>
Based on the set value of the incineration amount of the waste incinerator, the standard value of the manipulated variable of the operation end of the waste incinerator is set by a predetermined rule or relational expression for deriving the standard value of the manipulated variable based on the set value of the incinerated amount. However, when the incineration operating conditions or incineration characteristics of the waste incinerator change, the incineration operating conditions or incineration characteristics can be changed by adjusting the multiple control parameters that can be set and changed included in the above rules or relational expressions. A control for a combustion control device for a waste incinerator that performs decision support for adjustment of the control parameter in the combustion control device for the waste incinerator that controls by changing the reference value of the manipulated variable of the operation terminal in response to the change. A parameter determination support device,
The control parameter determination support device is
a control parameter adjustment history storage unit that stores an adjustment history of the control parameter by the combustion control device when the control parameter is adjusted;
a combustion state evaluation unit that acquires combustion process measurement values in the waste incinerator from the combustion control device and evaluates the combustion state in the waste incinerator before and after adjusting the control parameters;
a knowledge data creation unit for creating knowledge data in which the control parameter adjustment history stored in the control parameter adjustment history storage unit is associated with the evaluation of the combustion state by the combustion state evaluation unit;
a knowledge base storage unit that stores a database constructed with knowledge data;
When the control parameters are adjusted again, the degree of similarity between the evaluation of the combustion state in the waste incinerator at that time and the evaluation of the combustion state of each knowledge data included in the database of the knowledge base storage unit is calculated. a similar knowledge data extraction unit for extracting knowledge data having a high degree of similarity exceeding a predetermined threshold as similar knowledge data from the knowledge base storage unit;
a similar knowledge data display unit for displaying similar knowledge data extracted by the knowledge data extraction unit;
A control parameter determination support device for a combustion control device of a waste incinerator, characterized by comprising:

<Second invention>
Based on the set value of the incineration amount of the waste incinerator, the standard value of the manipulated variable of the operation end of the waste incinerator is set by a predetermined rule or relational expression for deriving the standard value of the manipulated variable based on the set value of the incinerated amount. However, when the incineration operating conditions or incineration characteristics of the waste incinerator change, the incineration operating conditions or incineration characteristics can be changed by adjusting the multiple control parameters that can be set and changed included in the above rules or relational expressions. A control for a combustion control device for a waste incinerator that performs decision support for adjustment of the control parameter in the combustion control device for the waste incinerator that controls by changing the reference value of the manipulated variable of the operation terminal in response to the change. A parameter determination support method,
storing an adjustment history of the control parameters by the combustion control device when the control parameters are adjusted;
Acquire the combustion process measurement values in the waste incinerator from the combustion control device, evaluate the combustion state in the waste incinerator before and after adjusting the control parameters,
Create knowledge data that associates the adjustment history of the acquired control parameters with the evaluation of the combustion state,
building a database with the knowledge data,
When adjusting the control parameters again, the degree of similarity between the evaluation of the combustion state in the waste incinerator at that time and the evaluation of the combustion state of each knowledge data included in the database is calculated, and a predetermined threshold value is calculated. extract knowledge data with a high degree of similarity exceeding from the database as similar knowledge data,
display the extracted similar knowledge data,
A control parameter determination support method for a combustion control device for a waste incinerator, characterized by:

In the first invention and the second invention, the control parameter adjustment history can include the adjustment amount of each of the plurality of control parameters and the adjustment order of the plurality of control parameters.

In the first and second inventions, knowledge data is created by associating the adjustment history of the control parameters in the past with the evaluation of the combustion state in the waste incinerator, and a database is constructed in advance with the knowledge data, and is used again. When adjusting the control parameters, similar knowledge data with a high degree of similarity to the evaluation of the combustion state in the waste incinerator at that time is extracted from the database and displayed. It assists the operator in adjusting the control parameters.

In the case of combustion in waste incinerators, the characteristics (trends) of each waste incinerator and the degree of aging of equipment, etc., will affect the combustion state even if the combustion state and control parameters are the same. not necessarily the same. Therefore, even if only the knowledge data in the most similar state is extracted from the past results, it is not always possible to appropriately adjust the control parameters. In the first and second inventions, knowledge data having a high degree of similarity exceeding a predetermined threshold is extracted as similar knowledge data, and all the extracted similar knowledge data are displayed to the operator, thereby providing the operator with a plurality of information. Present options to encourage more appropriate control parameter adjustments.

In addition, in the first invention and the second invention, since the value of the control parameter and the combustion state in the waste incinerator are related, the calculation of the degree of similarity with the evaluation of the past combustion state requires the combustion state In addition to the evaluation of , the similarity of the control parameters may also be considered. In addition, since the characteristics of the waste incinerator are considered to have an effect on the calculation of the degree of similarity with the evaluation of the past combustion state, may also be considered together.

In the first invention and the second invention, the manipulated variables of the plurality of operating ends may include the amount of combustion air, the amount of cooling air, and the grate feed speed. Further, in the first invention and the second invention, the evaluation items of the combustion state may include the amount of steam generated (evaporation amount), the gas temperature at a predetermined portion in the furnace, and the concentration of each gas component.

In the present invention, as described above, knowledge data is created by associating the adjustment history of the control parameters in the past with the evaluation of the combustion state in the waste incinerator, and a database is constructed in advance with the knowledge data, When adjusting the control parameters, similar knowledge data with a high degree of similarity to the evaluation of the combustion state in the waste incinerator at that time is extracted from the database and displayed. get

Conventionally, when adjusting the control parameters of an automatic combustion control device to optimize the automatic combustion control, it was necessary for a technician with specific skills or a skilled operator who has comprehensive judgment ability to make adjustments. By utilizing the control parameter determination support device and method, it is possible for a general operator at each business establishment who does not have specific skills and skills to sequentially adjust the control parameters. In addition, since the evaluation of the post-adjustment combustion state can be referred to when adjusting the control parameters, it is possible to ensure more stable operation.

1 is a block diagram showing a schematic configuration of a combustion control device and a control parameter determination support device according to an embodiment of the present invention, showing a flow when constructing a knowledge base; FIG. 1 is a block diagram showing the configuration of a combustion control device and a control parameter determination support device according to an embodiment of the present invention, and shows the flow when similar knowledge data is displayed. FIG. 4 is a flow chart showing a control operation by a combustion control device; 4 is a flow chart showing the operation of creating a knowledge base of the control parameter determination support device; 4 is a flow chart showing the operation of displaying similar knowledge data of the control parameter determination support device. It is a figure which shows the example of the knowledge base of a control parameter determination support apparatus, and shows the adjustment log|history of a control parameter group. FIG. 4 is a diagram showing an example of a knowledge base of the control parameter determination support device, and is a diagram showing evaluation of the combustion state before and after adjustment of the control parameter group. FIG. 10 is a diagram showing an example of display of similar knowledge data in a similar knowledge data display unit of the control parameter determination support device;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings.

The waste incinerator (garbage incinerator) (not shown) in the embodiment of the present invention is a grate-type incinerator having a grate. and a boiler with a heat exchanger and a steam drum located downstream of the furnace outlet of the furnace.

The wastes introduced from the waste inlet are sent to the grate as the operating end by the pusher or the like of the waste supply device as the operating end. The grate reciprocates, and the reciprocating motion agitates and moves the waste. The waste on the grate is dried by blowing combustion air supplied to the wind box below the grate by a combustion air blower and then combusted to produce flue gas and ash. The ash falls from the ash drop port and is discharged out of the furnace.

The total amount of combustion air supplied into the furnace from below the grate is adjusted by a combustion air damper as an operating end provided in the immediate vicinity of the combustion air blower, and the combustion air supplied to each wind box is adjusted by an under-grate combustion air damper as an operating end provided in each pipe supplying combustion air to each wind box.

In addition, cooling air is blown in by a cooling air blower from a cooling air inlet provided in the furnace wall, and the unburned components in the combustion gas are completely burned, and the temperature of the furnace wall rises excessively. to prevent The amount of cooling air supplied into the furnace from the cooling air inlet is adjusted by a cooling air damper as an operating end provided in the immediate vicinity of the cooling air blower.

The combustible gas generated in the waste drying process and the main combustion process on the upstream side of the grate and the flue gas generated in the post-combustion process on the downstream side of the grate join together at the gas mixing section provided on the furnace outlet side of the furnace and After stirring and mixing, secondary combustion air is supplied and secondary combustion is performed. A boiler equipped with a heat exchanger and a steam drum is installed downstream of the secondary combustion section, where thermal energy is recovered from the combustion gas and used to generate steam before being exhausted outside through the chimney.

In addition, an intermediate ceiling is provided in the furnace at an upper position in the height direction of the furnace. By providing the intermediate ceiling in the furnace, the gas in the furnace is generated in the waste drying process on the upstream side of the grate and the gas containing a large amount of combustible gas generated in the main combustion process and in the post-combustion process on the downstream side. The combustion exhaust gas can be divided into two parts and discharged. Specifically, the combustion exhaust gas flows through a flue (main flue) below the intermediate ceiling, and the gas containing a large amount of combustible gas flows through a flue (sub flue) above the intermediate ceiling. Then, the combustion exhaust gas and the gas containing a large amount of the combustible gas join together in the gas mixing section, thereby further promoting the stirring and mixing of the gas in the gas mixing section and further stabilizing the combustion in the secondary combustion section. It is possible to further suppress the generation of dioxins in the combustion process and prevent the generation of unburned waste.

Further, thermometers for measuring gas temperature in the furnace are provided at a plurality of positions in the furnace. Specifically, in the height direction of the furnace, a combustion chamber gas thermometer is located midway between the grate and the cooling air inlet, a main flue gas thermometer is located below the furnace outlet, and a flue gas thermometer is located below the furnace outlet. A furnace outlet lower gas thermometer, a furnace outlet central gas thermometer at a central position of the furnace outlet, and a furnace outlet gas thermometer at a downstream position of the furnace outlet are provided.

In addition, the boiler is provided with a boiler outlet oxygen concentration meter for measuring the concentration of oxygen (O ₂ ) in the exhaust gas on the outlet side of the boiler. A gas concentration meter is installed at the entrance of the chimney to measure the concentrations of carbon monoxide (CO) and nitrogen oxides ( _NOx ) in the exhaust gas, and the pipe connecting the boiler outlet and the chimney measures the amount of exhaust gas. An exhaust gas flow meter is provided for

In the present embodiment, the manipulated variables (combustion air amount, cooling air amount, waste supply device feed speed, and grate feed speed) of each control end are controlled by the combustion control device 10 (see FIG. 1). It has become. The combustion control device 10 controls the manipulated variable of each manipulator based on a predetermined manipulated variable reference value setting relational expression, which will be described later. The operation amount reference value setting relational expression is a predetermined relational expression between the incineration amount set value (target value of incineration amount) and the operation amount reference value (target value of operation amount) of the operating terminal. The manipulated variable reference value setting relational expression is separately determined corresponding to each operating terminal, and is used to derive the manipulated variable reference value of the corresponding operating terminal based on the incineration amount set value. In this embodiment, the manipulated variable reference value setting relational expression is used to derive the manipulated variable reference value of the operating terminal. It is also possible to use a rule that In the rule, for example, the relationship between the incineration amount set value and the manipulated variable reference value can be defined in the form of whether or not a predetermined condition is satisfied.

Each manipulated variable reference value setting relational expression includes control parameters whose settings can be changed. As will be described later, the control parameter is set by the control parameter adjuster 15 described later in accordance with the waste incineration amount set value. Further, when the incineration operating conditions or incineration characteristics of the waste incinerator change, the adjusted control parameters are changed by the control parameter adjusting unit 15 in response to the change in the incineration operating conditions or the incineration characteristics. (adjusted). As a result of changing the control parameter in this manner, the preset manipulated variable reference value is changed.

A control parameter determination support device 20 is connected to the combustion control device 10 (see FIG. 1). The control parameter determination support device 20 constructs a knowledge base, which will be described later, and extracts and displays similar knowledge data, which will be described later, from the knowledge base, thereby enabling the operator to appropriately adjust the control parameters. there is Construction of the knowledge base and extraction and display of the similar knowledge data will be described later.

1 and 2 are block diagrams showing schematic configurations of the combustion control device 10 and the control parameter determination support device 20. FIG. 1 shows the flow of constructing the knowledge base, and FIG. 2 shows similar knowledge data. It shows the flow at the time of display.

1 and 2, the combustion control device 10 includes a combustion process data acquisition unit 11, a manipulated variable reference value calculator 12, a manipulated variable output unit 13, a combustion process data storage unit 14, a control and a parameter adjustment unit 15 .

The combustion process data acquisition unit 11 obtains combustion process measurement values as combustion state quantities in the furnace from the waste incineration furnace in operation (for example, values measured by each thermometer, each concentration meter, and exhaust gas flow meter, and the amount of waste cut out etc.) are acquired as combustion process data. The manipulated variable reference value calculation unit 12 stores in advance a plurality of manipulated variable reference value setting relational expressions including control parameters, and calculates the manipulated variable reference value of each operating terminal based on the set value of the waste incineration amount. . Further, the manipulated variable reference value calculator 12 corrects the manipulated variable reference value based on a pre-stored control algorithm in accordance with the variation amount of the combustion process measurement value acquired by the combustion process data acquisition unit 11. .

The manipulated variable output unit 13 converts the manipulated variable of each manipulation end, that is, the combustion air amount, the cooling air amount, the waste feeder feed speed, and the grate feed speed, into respective manipulated variable reference values (manipulated variable reference values Each operation amount adjusted so as to follow the operation amount reference value calculated or corrected by the calculation unit 12 is output to each operation end. In this embodiment, the combustion air amount and the cooling air amount are adjusted by controlling the opening degrees of the combustion air damper, the under-grate combustion air damper, and the cooling air damper.

The combustion process data storage unit 14 stores combustion process measurement values (combustion process data) acquired by the combustion process data acquisition unit 11 . When the operator adjusts the control parameters, the control parameter adjustment unit 15 sets the control parameters of the operation amount reference value setting relational expressions stored in the operation amount reference value calculation unit 12 as desirable control parameters. Adjust so that In this embodiment, the control parameters are adjusted in consideration of not only the amount of adjustment (increase/decrease) in each control parameter, but also the order of adjusting the plurality of control parameters.

The control operation of the combustion control device 10 will be described based on FIG. FIG. 3 is a flow chart showing the control operation by the combustion control device 10. As shown in FIG. First, the operator sets a target value for the amount of waste to be incinerated as an incineration amount setting value (S1). The incineration amount set value is stored in the operation amount reference value calculation unit 12 . Next, the operation amount reference value calculation unit 12 calculates the amount of input heat other than waste (heat amount of heating air for combustion, etc.), the amount of heat discharged from the furnace, and the heat recovery, according to the stored incineration amount set value. Waste quality (lower heating value of waste) is calculated based on the planned amount of heat to be recovered as steam, and set as a waste quality set value (S2). The dust quality setting value is also stored in the operation amount reference value calculation unit 12 .

Next, the operator adjusts the control parameters included in the manipulated variable reference value setting relational expression stored in advance in the manipulated variable reference value calculator 12 (S3). At the start of operation (operation) after construction of the incinerator, the adjustment (setting) of the control parameters should be adjusted according to the planned or scheduled incineration amount and waste quality for controlling the initial setting of long-term variable factors. done. In addition, after the operation of the waste incinerator, if the incineration amount set value is changed due to changes in the incineration operation conditions of the incinerator, changes in the incineration characteristics of the incinerator, etc., the control parameter can be changed by the operator. adjusted (changed). At this time, the operator refers to similar knowledge data displayed on the similar knowledge data display unit 26 of the control parameter determination support device 20, which will be described later, and adjusts each control parameter to an appropriate value in an appropriate order. The adjusted control parameters are output from the control parameter adjusting section 15 to the manipulated variable reference value calculating section 12 .

After the control parameters are adjusted as described above, the operation amount reference value calculation unit 12 calculates each operation amount reference value using the operation amount reference value setting relational expression based on the incineration amount setting value (S4 ). At this time, if the control parameter has been changed in S3, the manipulated variable reference value setting relational expression including the changed control parameter acquired from the control parameter adjusting unit 15 is used. After the operation amount reference value is calculated in this manner, the operation amount of each operation terminal is controlled so as to follow the operation amount reference value, and the waste incinerator is operated.

During the operation of the incinerator, the combustion process data acquisition unit 11 acquires each combustion process measurement value (for example, each thermometer, each densitometer, measurement value by exhaust gas flow meter, amount of waste, etc.), so that the combustion Monitor process measurements for variations (S5). When the amount of variation in the combustion process measurement value deviates from the predetermined range, the operation amount reference value calculation unit 12 calculates the operation amount reference value (changed If so, a correction amount for the changed operation amount reference value) is calculated (S6), and the operation amount reference value is corrected (S7). Further, when the fluctuation amount of the combustion process measurement value does not deviate from the predetermined range, the manipulated variable reference value calculator 12 does not correct the manipulated variable reference value. Then, the manipulated variable output unit 13 controls each manipulated variable based on the manipulated variable reference value calculated by the manipulated variable reference value calculator 12 (the corrected manipulated variable reference value if corrected) (S8 ).

Next, the configuration of the control parameter determination support device 20 will be described. 1 and 2, the control parameter determination support device 20 includes a control parameter adjustment history storage unit 21, a combustion state evaluation unit 22, a knowledge data creation unit 23, a knowledge base storage unit 24, and similar It has a knowledge data extraction unit 25 and a similar knowledge data display unit 26 .

The control parameter adjustment history storage unit 21 acquires and stores the past control parameter adjustment history from the control parameter adjustment unit 15 of the combustion control device 10 before the control parameter is adjusted by the operator. The combustion state evaluation unit 22 acquires past combustion process data, that is, combustion process measurement values in the waste incinerator from the combustion process data storage unit 14 of the combustion control device 10, and evaluates the control parameters before and after adjustment. Evaluate the combustion state in each waste incinerator. At this time, the evaluation of the combustion state is performed, for example, by normalizing (standardizing) the combustion process measurement value indicating the combustion state in the furnace.

As described below, the knowledge data creation unit 23 creates knowledge data by associating the control parameter adjustment history stored in the control parameter adjustment history storage unit 21 with the evaluation of the combustion state by the combustion state evaluation unit 22. .

The knowledge data creation unit 23 calculates a plurality of control parameters in a series of control parameter adjustment work performed by the operator at one time from the past control parameter adjustment history stored in the control parameter adjustment history storage unit 21. Acquire (extract) data of parameter adjustment history (hereinafter referred to as “parameter group adjustment history” as necessary). The parameter group adjustment history includes information about the degree of adjustment of each control parameter and the adjustment order of a plurality of control parameters included in the manipulated variable reference value setting relational expression. The knowledge data creation unit 23 extracts the parameter group adjustment history for each adjustment work performed at each timing.

In addition, the knowledge data creation unit 23 acquires from the combustion state evaluation unit 22 data relating to the evaluation of the combustion state in the waste incinerator before and after adjustment of the control parameters corresponding to the extracted parameter group adjustment history. , data in which the evaluation of the combustion state is associated with the parameter group adjustment history is created as knowledge data. The knowledge data creating unit 23 creates the above knowledge data for each adjustment work in the past.

The knowledge base storage unit 24 stores a database constructed from all the knowledge data created by the knowledge data creation unit 23 as a knowledge base.

When the operator adjusts the control parameters again, the combustion process data acquisition unit 11 acquires the combustion process measurement value at that time, and the combustion state evaluation unit 22 calculates the combustion state in the waste incinerator based on the combustion process measurement value. Evaluate. The similar knowledge data extraction unit 25 acquires the evaluation of the combustion state in the waste incinerator from the combustion state evaluation unit 22 when adjusting the control parameters, and stores the obtained evaluation of the combustion state in the knowledge base storage unit. The evaluation of the combustion state of each piece of knowledge data included in 24 knowledge bases (databases) is compared to calculate the degree of similarity between the two. Further, the similar knowledge data extracting unit 25 selects, among the knowledge data contained in the knowledge base, the knowledge data associated with the evaluation of the combustion state with a high degree of similarity exceeding a predetermined threshold value as similar knowledge data, and the knowledge base storage unit 24 Get (extract) from The similar knowledge data display unit 26 displays the similar knowledge data extracted by the similar knowledge data extraction unit 25 on a display or the like.

Next, the operation of the control parameter determination support device 20 will be described separately for the operation when creating a knowledge base and the operation when displaying similar knowledge data.

Prior to adjusting the control parameters by the operator, a knowledge base is created. First, based on FIG.1 and FIG.4, operation|movement of preparation of the knowledge base by the control parameter determination assistance apparatus 20 is demonstrated. FIG. 4 is a flow chart showing the operation of the control parameter determination support device 20 for creating a knowledge base. The control parameter adjustment history storage unit 21 acquires and stores the past control parameter adjustment history from the control parameter adjustment unit 15 of the combustion control device 10 (S1). Next, the knowledge data creation unit 23 generates parameter group adjustment history data related to a series of adjustment work from the past control parameter adjustment history stored in the control parameter adjustment history storage unit 21 for each past adjustment work. Acquire (extract) (S2).

Next, the combustion state evaluation unit 22 acquires combustion process data (combustion process measurement values) before and after the adjustment of the control parameters from the combustion process data storage unit 14 of the combustion control device 10, and determines the waste before and after the adjustment of the control parameters. The combustion state in the incinerator is evaluated (S3).

Then, the knowledge data creation unit 23 acquires the parameter group adjustment history extracted in S2 from the control parameter adjustment history storage unit 21, and transmits data related to evaluation of the combustion state corresponding to the parameter group adjustment history to the combustion state evaluation unit. 22, and creates as knowledge data the data in which the parameter group adjustment history and the evaluation of the combustion state are associated (S4). In S4, the knowledge data creation unit 23 creates the knowledge data for each adjustment work. Next, the database constructed with all the knowledge data created by the knowledge data creation unit 23 is stored as a knowledge base in the knowledge base storage unit 24 (S5).

After the knowledge base is stored in the knowledge base storage unit 24 in this manner, each time the operator adjusts the control parameters, new knowledge data corresponding to the adjustment of the control parameters is created. Knowledge data is preferably added to the knowledge base. In addition, in the present embodiment, it is assumed that the control parameters have already been adjusted a plurality of times when the knowledge base is constructed for the first time. The knowledge data may be created and the knowledge base may be constructed from the moment the control parameters are adjusted, and then the knowledge data may be created and added to the knowledge base each time the control parameters are adjusted.

Next, the operation of displaying similar knowledge data by the control parameter determination support device 20 will be described with reference to FIGS. 2 and 5. FIG. FIG. 5 is a flow chart showing the operation of the control parameter determination support device 20 for displaying similar knowledge data. This operation of displaying similar knowledge data is performed in a state in which the knowledge base is already stored in the knowledge base storage unit 24 .

The set value of the incineration amount is changed according to the change in the incineration operating conditions and incineration characteristics of the incinerator (S1). When the incineration amount set value is changed and the operator needs to adjust the control parameters, the combustion state evaluation unit 22 determines the incinerator at the time when the incineration amount set value is changed (current), that is, before the control parameter adjustment. The internal combustion state is evaluated (S2). This evaluation of the combustion state is performed by acquiring the combustion process measurement value before the control parameter adjustment by the combustion process acquisition unit 11 and evaluating it by the combustion state evaluation unit 22 . The similar knowledge data extraction unit 25 acquires the evaluation data of the combustion state before the control parameter adjustment from the combustion state evaluation unit 22, and the evaluation of the combustion state before the control parameter adjustment and the data stored in the knowledge base storage unit 24. The degree of similarity between each piece of knowledge data included in the existing knowledge base and the combustion state evaluation (past combustion state before control parameter adjustment) is calculated (S3). At this time, the similarity knowledge data extraction unit 25 also considers the changed incineration amount set value to calculate the degree of similarity.

Then, the similar knowledge data extracting unit 25 extracts knowledge data having a high degree of similarity, in other words, a degree of similarity greater than a predetermined threshold, as similar knowledge data as a result of calculating the degree of similarity (S4). The similar knowledge data display unit 26 displays all the similar knowledge data extracted by the similar knowledge data extraction unit 25 on a display or the like together with the evaluation of the combustion state before and after the adjustment of the control parameters (S5). As a result, the operator selects the similar knowledge data having the most desirable combustion state after parameter adjustment from the plurality of similar knowledge data displayed by the similar knowledge data display unit 26, and selects the similar knowledge data can be referred to for a series of control parameter adjustment work.

By utilizing the control parameter determination support device and method of the present invention in this way, it becomes possible for a general operator at each business establishment who does not have specific skill and skill to sequentially adjust the control parameters. In addition, since the evaluation of the post-adjustment combustion state can be referred to when adjusting the control parameters, it is possible to ensure more stable operation. Further, when performing the control parameter adjustment work, the operator may refer to and consider the displayed similarity knowledge data to independently determine the degree of increase or decrease of the control parameters and the order of adjustment.

Next, based on FIG. 6 to FIG. 8, the contents of creation of the knowledge base and display of similar knowledge data by the control parameter determination support device 20 will be specifically described. FIG. 6 shows the adjustment history of the control parameter group in the knowledge data that is part of the knowledge base created by the control parameter determination support device 20. As shown in FIG. FIG. 7 shows the evaluation of the combustion state before and after adjustment of the control parameter group among the knowledge data. Every time a series of control parameter adjustment work is performed, the knowledge data creation unit 23 of the control parameter determination support device 20 sets the adjustment history to "history 1", "history 2", as shown in FIGS. , . . . , and the evaluation of the combustion state in the furnace is sequentially accumulated. At this time, the knowledge data creation unit 23 creates knowledge data by associating the control parameter group adjustment history shown in FIG. 6 with the combustion state evaluation shown in FIG. 7 for each history. The knowledge base storage unit 24 constructs and stores a knowledge base with the knowledge data thus created.

Among the knowledge data shown in FIG. 6, the item of adjustment history of the control parameter group will be described. “Adjustment start date and time” is the date and time when the parameter adjustment was performed. "Adjustment items" are control parameters included in each manipulated variable reference value setting relational expression, and are referred to as parameters A, B, C, . . . . Each control parameter is a parameter included in a relational expression for calculating the manipulated variable reference value of the corresponding operating end. For example, the parameter A is a parameter included in the relational expression for calculating the manipulated variable reference value of the grate, the parameter B is the parameter included in the relational expression for calculating the manipulated variable reference value of the combustion air damper, is set as

“Adjustment No.” in FIG. 6 indicates the order of adjusting the control parameters in a series of adjustment operations for adjusting a plurality of control parameters in sequence. For example, in "history 1" of FIG. 6, adjustments are made in the order of parameter A, parameter C, and parameter B, and in "history 2", adjustment is made in the order of parameter E, parameter D, and parameter A. ing. “Amount of change” is the amount of parameter adjustment, in other words, the amount of increase or decrease. In the "history 1" of FIG. 6, the parameter A is increased by "10", the parameter C is decreased by "5", and the parameter B is increased by "20". An adjustment has been made to increase parameter D by 5, decrease parameter D by 8, and increase parameter A by 8.

Among the knowledge data shown in FIG. 7, items for evaluating the combustion state before and after adjustment of the control parameter group will be described. The "combustion state" is a combustion state to be evaluated by the combustion state evaluation unit 22, and includes, for example, the amount of evaporation and the NO _X concentration shown in FIG. The “evaluation value” is a numerical value indicating the combustion state in the furnace (for example, measured values such as evaporation amount and NO _X concentration) normalized (standardized) for evaluation. Note that normalization is not essential, and measured values such as the amount of evaporation and NO _X concentration may be used as evaluation values as they are.

"Adjustment No. 1", "Adjustment No. 2", etc. in the "evaluation value" of FIG. 7 correspond to "1", "2", ... in the "Adjustment No." of FIG. there is "At start" in FIG. 7 indicates before the change of the control parameters, and "at the end" indicates after the change of the control parameters. For example, “Adjustment No. 1” and “Adjustment No. 2” of “History 1” in FIG. 7 correspond to “Adjustment No. 1” of “History 1” in FIG. ), and “Adjustment No. 2” (adjustment to decrease parameter C by “5”). Therefore, in FIG. 7, the adjustment of parameter A in "Adjustment No. 1" increased the evaporation amount from "10" to "20" and the NO _X concentration from "5" to "6". By adjusting parameter C in "Adjustment No. 2", the evaporation amount decreased from "20" to "19" and the NO _X concentration decreased from "6" to "3". It is shown that.

As described above, the similar knowledge data extraction unit 25 of the control parameter determination support device 20 evaluates the combustion state in the waste incinerator at that point in time when the operator adjusts the control parameters, and The degree of similarity with the evaluation of the combustion state before parameter adjustment (numerical values in the column of “at start” in FIG. 7) is calculated for each knowledge data obtained, and knowledge data with a high degree of similarity that exceeds a predetermined threshold is added to the knowledge base are extracted as similar knowledge data from

FIG. 8 shows an example of display of similar knowledge data in the similar knowledge data display unit 26 of the control parameter determination support device 20. As shown in FIG. As shown in FIG. 8, the similar knowledge data display unit 26 displays a plurality of extracted similar knowledge data in descending order of similarity. Items displayed as similar knowledge data include "history No.", "state similarity", "parameter adjustment item", "change amount", and "combustion state evaluation value". Here, as seen in FIG. 8, the "parameter adjustment item" indicates the control parameters to be adjusted arranged in the order of adjustment, and the "change amount" indicates the adjustment amount of the control parameter. It is That is, for example, in "history 4" having the highest degree of similarity (state similarity), parameter B, parameter D, and parameter A are adjusted in this order. The "combustion state evaluation value" indicates the evaluation of each combustion state before and after parameter adjustment when the control parameters are adjusted in the order indicated by the "parameter adjustment item." In FIG. 8, for example, in “history 4”, the adjustment to increase the parameter B by “5”, the adjustment to decrease the parameter D by “8”, and the adjustment to increase the parameter A by “8” are performed. As a result of performing in order, the amount of evaporation increased from "11.7" to "13.1", and the _NOx concentration decreased from "43.2" to "39.9".

The operator can refer to a plurality of pieces of similar knowledge data displayed on the similar knowledge data display unit 26 to determine which control parameter to adjust and in what order and how much to increase or decrease. At this time, referring to higher similarity knowledge data is effective in appropriately adjusting the control parameters. However, referring to the similar knowledge data with the highest degree of similarity is not always the best, and the similar knowledge data to be referenced is appropriately selected by comprehensively considering the operating conditions of the incinerator at that time, the incineration characteristics, etc. and adjust the control parameters.

By utilizing the control parameter determination support device 20 according to the present embodiment, even general operators of waste incineration plants who do not have specific skills and skills can sequentially adjust control parameters. Become. In addition, since the evaluation of the post-adjustment combustion state can be referred to when adjusting the control parameters, it is possible to ensure more stable operation.

REFERENCE SIGNS LIST 10 combustion control device 20 control parameter determination support device 21 control parameter adjustment history storage unit 22 combustion state evaluation unit 23 knowledge data creation unit 24 knowledge base storage unit 25 similar knowledge data extraction unit 26 similar knowledge data display unit

Claims (4)

Based on the set value of the incineration amount of the waste incinerator, the standard value of the manipulated variable of the operation end of the waste incinerator is set by a predetermined rule or relational expression for deriving the standard value of the manipulated variable based on the set value of the incinerated amount. However, when the incineration operating conditions or incineration characteristics of the waste incinerator change, the incineration operating conditions or incineration characteristics can be changed by adjusting the multiple control parameters that can be set and changed included in the above rules or relational expressions. A control for a combustion control device for a waste incinerator that performs decision support for adjustment of the control parameter in the combustion control device for the waste incinerator that controls by changing the reference value of the manipulated variable of the operation terminal in response to the change. A parameter determination support device,
The control parameter determination support device is
a control parameter adjustment history storage unit that stores an adjustment history of the control parameters in the combustion control device when the control parameters are adjusted;
a combustion state evaluation unit that acquires combustion process measurement values in the waste incinerator from the combustion control device and evaluates the combustion state in the waste incinerator before and after adjusting the control parameters;
a knowledge data creation unit for creating knowledge data in which the control parameter adjustment history stored in the control parameter adjustment history storage unit is associated with the evaluation of the combustion state by the combustion state evaluation unit;
a knowledge base storage unit that stores a database constructed with knowledge data;
When the control parameters are adjusted again, the degree of similarity between the evaluation of the combustion state in the waste incinerator at that time and the evaluation of the combustion state of each knowledge data included in the database of the knowledge base storage unit is calculated. a similar knowledge data extraction unit for extracting knowledge data having a high degree of similarity exceeding a predetermined threshold as similar knowledge data from the knowledge base storage unit;
a similar knowledge data display unit for displaying similar knowledge data extracted by the knowledge data extraction unit;
A control parameter determination support device for a combustion control device of a waste incinerator, characterized by comprising: 2. A control parameter determination support device for a combustion control device of a waste incinerator according to claim 1, wherein the control parameter adjustment history includes adjustment amounts of each of the plurality of control parameters and adjustment order of the plurality of control parameters. . Based on the set value of the incineration amount of the waste incinerator, the standard value of the manipulated variable of the operation end of the waste incinerator is set by a predetermined rule or relational expression for deriving the standard value of the manipulated variable based on the set value of the incinerated amount. However, when the incineration operating conditions or incineration characteristics of the waste incinerator change, the incineration operating conditions or incineration characteristics can be changed by adjusting the multiple control parameters that can be set and changed included in the above rules or relational expressions. A control for a combustion control device for a waste incinerator that performs decision support for adjustment of the control parameter in the combustion control device for the waste incinerator that controls by changing the reference value of the manipulated variable of the operation terminal in response to the change. A parameter determination support method,
storing an adjustment history of the control parameters by the combustion control device when the control parameters are adjusted;
Acquire the combustion process measurement values in the waste incinerator from the combustion control device, evaluate the combustion state in the waste incinerator before and after adjusting the control parameters,
Create knowledge data that associates the adjustment history of the acquired control parameters with the evaluation of the combustion state,
building a database with the knowledge data,
When adjusting the control parameters again, the degree of similarity between the evaluation of the combustion state in the waste incinerator at that time and the evaluation of the combustion state of each knowledge data included in the database is calculated, and a predetermined threshold value is calculated. extract knowledge data with a high degree of similarity exceeding from the database as similar knowledge data,
display the extracted similar knowledge data,
A control parameter determination support method for a combustion control device for a waste incinerator, characterized by: 4. The control parameter determination support method for a combustion control device of a waste incinerator according to claim 3, wherein the adjustment history of the control parameters includes the adjustment amount of each of the plurality of control parameters and the adjustment order of the plurality of control parameters. .

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