Heat recovery boiler system control device, heat recovery boiler system control method, and program

Abstract

To provide a control device of a heat recovery boiler system which can suppress corrosion by monitoring a corrosive state in realtime, a control method of the heat recovery boiler system and a program.SOLUTION: A control device of the present invention comprises: an acquisition part for acquiring a first measurement value indicating measurement data of an ultrasonic sensor, and a second measurement value indicating measurement data of a dual-electrode sensor; an estimation part for estimating at least either of a thinning amount of a probe and the fusion of the adhesion ash of the probe on the basis of at least either of the first measurement value and the second measurement value; a determination part for determining an operation command of processing to the adhesion ash on the basis of an estimation result of the estimation part; a water injection device for lowering a gas temperature as processing to the thinning and the adhesion ash on the basis of a determination result of the determination part; and an operation control part for controlling at least one of operations of a soot removal device for removing the adhesion ash.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a control device for a heat recovery boiler system, a control method for a heat recovery boiler system, and a program. [Background technology]

[0002] In incinerators such as waste incinerator boilers, soda recovery boilers, and coal-fired boilers, as well as in the furnaces and flues of boiler furnaces, fuels such as coal and waste contain chlorine, heavy metals, sulfur, vanadium, etc., which can cause corrosion of metal materials such as boiler superheater tubes. However, since there is a large variation in fuel properties, particularly in waste incinerator boilers, it is difficult to predict the lifespan of boiler superheater tubes in advance.

[0003] For example, Patent Document 1 listed below discloses a heat recovery plant which includes a corrosion detection means for detecting corrosion of metal parts of a boiler, a corrosive environment monitoring means for monitoring the corrosive environment of the boiler based on information from the corrosion detection means and detecting when the corrosive environment has become severe, and which, when the corrosive environment of the boiler becomes severe, estimates the cause of the severe corrosive environment based on at least one of the incinerator throughput, the amount of combustion air supplied to the incinerator, the amount of steam generated in the boiler, and the amount of heat generated, determines measures to alleviate the corrosive environment, and controls the operation of the incinerator so as to alleviate the corrosive environment based on the determined measures. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5767486 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the heat recovery plant described in Patent Document 1, controlling the operation of the combustion furnace has the drawback of causing a decrease in operational performance (failure to achieve planned processing volume, decrease in heat recovery efficiency, etc.) In view of the above problems, the present disclosure aims to provide a control device for a heat recovery boiler system, a control method for a heat recovery boiler system, and a program that are capable of suppressing corrosion by monitoring the corrosion state in real time. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the heat recovery boiler system according to the present disclosure includes an acquisition unit that acquires a first measurement value indicating measurement data of an ultrasonic sensor and a second measurement value indicating measurement data of a two-electrode sensor, an estimation unit that estimates at least one of an amount of thinning of the probe and melting of ash adhering to the probe based on at least one of the first measurement value and the second measurement value, a determination unit that determines an operation command for a process for the adhering ash based on an estimation result of the estimation unit, and a water injection device that lowers the gas temperature and a water injection device that removes the adhering ash as processes for the thinning and the adhering ash based on the determination result of the determination unit. Except and an operation control unit that controls the operation of at least one of the soot devices.

[0007] In order to solve the above-mentioned problems and achieve the object, a control method for a heat recovery boiler system according to the present disclosure includes a step of acquiring a first measurement value indicating measurement data of an ultrasonic sensor and a second measurement value indicating measurement data of a two-electrode sensor, a step of estimating at least one of an amount of thinning of the probe and melting of ash adhering to the probe based on at least one of the first measurement value and the second measurement value, a step of determining an operation command for a process for the adhering ash based on the estimation result, and a step of determining an operation command for a water injection device that lowers the gas temperature and a water injection device that removes the adhering ash as processes for the thinning and the adhering ash based on the determination result. Except and c) controlling operation of at least one of the soot devices.

[0008] In order to solve the above-mentioned problems and achieve the object, the program disclosed herein includes a step of acquiring a first measurement value indicating measurement data of an ultrasonic sensor and a second measurement value indicating measurement data of a two-electrode sensor, a step of estimating at least one of an amount of thinning of the probe and melting of ash adhering to the probe based on at least one of the first measurement value and the second measurement value, a step of determining an operation command for processing the adhering ash based on the estimation result, and a step of determining an operation command for processing the thinning and adhering ash based on the determination result, a step of determining an operation command for a water injection device that lowers the gas temperature and a step of determining an operation command for removing the adhering ash as processing the thinning and adhering ash. Except and controlling operation of at least one of the soot devices. Effect of the Invention

[0009] According to the present disclosure, it is possible to provide a control device for a heat recovery boiler system, a control method for a heat recovery boiler system, and a program that are capable of suppressing corrosion by monitoring the corrosion state in real time. [Brief description of the drawings]

[0010]

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[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments described below.

[0012] (Configuration of heat recovery boiler system) Fig. 1 is a schematic diagram showing a configuration example of a heat recovery boiler system 10 according to the present disclosure. As shown in Fig. 1, the heat recovery boiler system 10 according to the present disclosure includes an incinerator 200 and a boiler furnace 300. The boiler furnace 300 includes high-temperature corrosion monitoring probes 310 (310A, 310B, 310C) and Except The system includes a soot device 320 (320A, 320B, 320C), a heat exchanger 330 (330A, 330B, 330C), and a water injection device 340.

[0013] The incinerator 200 is supplied with fuel from a fuel supply device 202 and burns the fuel in the incinerator. The incinerator 200 burns garbage (waste), black liquor, coal, petroleum, biomass, asphalt, etc. as fuel to generate combustion gas G. In this embodiment, the incinerator is an incinerator that decomposes objects, but the present invention can be applied to a combustion furnace that burns fuel. The incinerator in FIG. 1 is a schematic diagram of a stoker type incinerator. The incinerator 200 may be realized by a pulverized coal combustion furnace, an oil / gas combustion furnace, a stoker type incinerator, a fluidized bed incinerator, a shaft type gasification melting furnace, a fluidized bed type gasification melting furnace, a kiln type gasification melting furnace, etc. The combustion gas G from the incinerator 200 is supplied to the inside of the boiler furnace 300, and heat is recovered from the combustion gas G by superheating the steam circulating inside the heat exchanger 330.

[0014] The boiler furnace 300 is provided with various heat exchangers 330 and recovers heat from the combustion gas G generated in the incinerator 200. The boiler furnace 300 is provided with heat exchangers 330 such as an evaporator, a superheater, and a coal economizer that recover heat from the combustion gas G to water. When the combustion gas G that flows into the boiler furnace 300 comes into contact with these heat exchangers 330, heat is transferred from the combustion gas G to the heat transport medium flowing through the heat exchangers 330.

[0015] The high-temperature corrosion monitoring probe 310 (hereinafter referred to as the "probe") includes a thin ultrasonic sensor and a two-electrode sensor, and detects the amount of thinning of the probe 310 and the melting state of the attached ash. As shown in FIG. 1, the probe 310 is provided on the upstream side of the combustion gas G of the heat exchanger 330. The probe 310 is manufactured to simulate a heat transfer tube of the heat exchanger 330. Therefore, the amount of thinning of the probe 310 and the melting state of the attached ash may be regarded as the amount of thinning of the heat transfer tube of the heat exchanger 330 and the melting state of the attached ash. The thin ultrasonic sensor provided on one side in the thickness direction of the probe 310 includes a piezoelectric element, and by applying a high-frequency voltage to the piezoelectric element, the piezoelectric element is vibrated at a high frequency to emit ultrasonic waves, which are transmitted inside the probe 310, and the reflected waves of the ultrasonic waves are received from the opposite end of the probe 310 equipped with the piezoelectric element, and the wall thickness is calculated based on the time interval until the reflected waves are received. The two-electrode sensor provided on the probe 310 detects the melting of the adhering ash by measuring the current value between electrodes that are electrically unconnected from each other when a conductive liquid is produced by the melting of the adhering ash.

[0016] A normal ultrasonic sensor is too large to be installed in a narrow space such as the inside of the probe 310, and may be difficult to install. In addition, normal ultrasonic sensors have problems with heat resistance. Furthermore, when the probe 310 is installed in a corrosive environment exposed to high-temperature combustion gas G, a problem occurs in that the durability required for long-term operation is not met. On the other hand, the thin ultrasonic sensor according to the present application can easily measure multiple locations. In addition, the two-electrode sensor has a simple structure, is highly durable, and does not induce adhesion like a multiple-electrode sensor. In addition, when the thickness of the attached ash increases, the two-electrode sensor can grasp the increase in the contact area between the attached ash and the electrode, thereby reducing the resistance, and it is possible to obtain a lot of information about the phenomenon even with a simple structure.

[0017] Except The soot removal device 320 is a device for removing soot and ash adhering to the heat transfer tubes of the heat exchanger 330 of the boiler furnace 300. As shown in FIG. Except The soot device 320 is provided upstream of the combustion gas G from the heat exchanger 330 . Except The soot device 320 may be, for example, a shock pulse soot blower. The shock pulse soot blower fills the inside of the soot blower with combustible gas, and generates a shock wave by the explosion of the combustible gas. Except The steam generated in the boiler furnace 300 is blown by using a shock pulse type soot blower. Except Since it is possible to eliminate the need to use soot, the steam generated in the boiler furnace 300 is usually used. Except Compared to the case where a soot device is used, steam loss can be reduced, and therefore the heat recovery efficiency of the heat recovery boiler system 10 can be increased.

[0018] The heat exchanger 330 recovers heat from the combustion gas G to a heat transport medium. A plurality of heat exchangers 330 are provided in the boiler furnace 300. The heat exchanger 330 may be, for example, an evaporator, a superheater, or a coal economizer. These recover heat by using water as a heat transport medium, and transferring heat from the combustion gas G from the heat transfer tube to the water flowing inside the heat transfer tube constituting the heat exchanger 330 by thermal conduction or thermal transfer.

[0019] The water injection device 340 is provided upstream of the gas flow with respect to the heat exchanger 330, and injects water into the inside of the boiler furnace 300 to cool the gas and lower the gas temperature when the combustion gas G reaches the heat exchanger 330. The water injection device 340 may be composed of, for example, an injection nozzle, a heat-resistant hose, and a pump unit. In FIG. 1, an example is shown in which the injection nozzle of the water injection device 340 is provided protruding from the side surface of the incinerator 200 in the left and right directions of the paper surface, but it may be provided protruding from the side surface of the incinerator 200 in the front direction of the paper surface and the side surface in the back direction of the paper surface. In addition, a heat-resistant hose may be suspended from the upper surface of the incinerator 200, and an injection unit to which an injection nozzle is attached and connected to the heat-resistant hose may be provided inside the incinerator 200, and water may be injected from the injection nozzle from the center of the incinerator 200 toward the side surface of the incinerator 200. In addition, the injection nozzle may be provided with an injection port opened on a wall surface forming the side surface of the incinerator 200, and the injection nozzle may not protrude into the interior of the incinerator 200.

[0020] As shown in FIG. Except The soot device 320 and the water injection device 340 are connected to the control device 100. These devices connected to the control device 100 operate based on signals sent from the control device 100. The control device 100 will be described below.

[0021] (Control device configuration) The control device 100 manages the heat recovery boiler system 10, and supervises and controls various devices and apparatuses that constitute the heat recovery boiler system 10. The configuration of the control device 100 will be described with reference to Fig. 2. Fig. 2 is a diagram showing an example of the configuration of the control device according to the present disclosure. The control device 100 includes a communication unit 110, a storage unit 120, a control unit 130, an input unit 140, and a display unit 150.

[0022] The communication unit 110 transmits and receives information to and from various devices and apparatuses that constitute the heat recovery boiler system 10. The communication unit 110 may be realized, for example, by various dedicated wired lines or wireless communication with security measures.

[0023] The storage unit 120 is a storage device that stores various information such as programs used in the processing of the control unit 130 and operation data of the heat recovery boiler system 10. The storage unit 120 may be realized by a combination of, for example, semiconductor memory elements such as a random access memory (RAM), a read only memory (ROM), and a flash memory, a hard disk, a solid state drive (SSD), an optical disk, and the like.

[0024] The storage unit 120 includes an operation data storage unit 121 and a model storage unit 122. Different types of information are stored in the operation data storage unit 121 and the model storage unit 122. An example of the information stored therein will be described below.

[0025] The operation data storage unit 121 stores various measurement values ​​and information related to the operation status generated in association with the operation of the heat recovery boiler system 10. Here, an example of information stored in the operation data storage unit 121 will be described with reference to FIG.

[0026] Fig. 3 is a diagram showing an example of information stored in the operation data storage unit according to the present disclosure. As shown in Fig. 3, the operation data storage unit 121 stores information related to various environmental conditions and operation-related items that affect corrosion, such as "measurement date and time", "first measurement value", "second measurement value", "pressure value", and "temperature value", in association with each other.

[0027] "Measurement date and time" is information indicating the date and time when various measurement values ​​were measured. "First measurement value" is information indicating the measurement value of a thin ultrasonic sensor. "Second measurement value" is information indicating the measurement value of a two-electrode sensor. "Pressure value" is information indicating the measurement value of a pressure measuring instrument. "Temperature value" is information indicating the measurement value of a temperature measuring instrument.

[0028] That is, in FIG. 3, the first measurement value "FMD#1", the second measurement value "SMD#1", the pressure value "PD#1", and the temperature value "TD#1" measured at the measurement date and time "TM#1" are linked and stored.

[0029] The information stored in the operation data storage unit 121 is not limited to information related to the items of "measurement date and time", "first measurement value", "second measurement value", "pressure value", and "temperature value", and may store data related to the operation of the heat recovery boiler system 10, such as the combustion chamber temperature, the superheater (SH) inlet gas temperature, the processing volume, and the evaporation volume. Furthermore, together with these stored data, data on the actual amount of thinning of the superheater tubes that is periodically measured may be stored in association with the stored data. This makes it clear that if the combustion chamber temperature or the SH inlet gas temperature is high, the calories of the waste as fuel are high in the first place. Furthermore, if the corrosion rate is fast, the amount of waste that can be removed will be reduced. Coal This makes it easier to make decisions regarding water spraying.

[0030] Here, the time series changes of the first measurement value and the second measurement value will be described with reference to Figs. 4 and 5, respectively. Fig. 4 is a diagram showing the time series changes of the measurement value of the thin ultrasonic sensor according to the present disclosure. The horizontal axis of Fig. 4 indicates the operation time of the heat recovery boiler system 10 in months. The vertical axis of Fig. 4 indicates the time series changes of the thickness of the probe 310 estimated using the first measurement value. As shown in Fig. 4, it can be seen that the thickness of the probe 310 tends to decrease as the operation time progresses.

[0031] The time series change of the second measurement value will be described with reference to FIG. 5. FIG. 5 is a diagram showing the time series change of the measurement value of the two-electrode sensor according to the present disclosure. The horizontal axis of FIG. 5 shows the operation time of the heat recovery boiler system 10 in units of months. The vertical axis of FIG. 5 shows the inter-electrode current as the second measurement value. As shown in FIG. 5, when a current is measured between the two electrodes, it is estimated that, for example, the gas temperature rises due to a change in the quality of the waste, and the surface temperature of the probe 310 rises accordingly, and the attached ash is heated and melted. In addition, by comparing with the timing at which the amount of reduction in the probe thickness shown in the graph shown in FIG. 4 increases, it is also possible to estimate the relationship between the melting of the attached ash and the tendency of thinning. In this way, by using the measurement value of the two-electrode sensor, it is possible to estimate the change in the properties of the waste put into the incinerator 200 and the melting state of the attached ash. For example, when burning waste with a high chlorine content such as plastic, the combustion chamber temperature rises, and the amount of adhesion and melting increases, thereby increasing the corrosion rate. Furthermore, when garbage containing a large amount of lead (Pb), zinc (Zn), or copper (Cu) is burned, the amount of melting increases, the corrosion rate increases, and there are few other changes. Furthermore, when the calorie content fluctuates greatly, such as with plastics, the combustion room temperature fluctuates greatly, the amount of adhesion increases, the amount of melting fluctuates, and the corrosion rate increases. Furthermore, when the calorie content fluctuates greatly, such as with garbage containing a lot of moisture, the combustion room temperature fluctuates greatly, and the amount of melting fluctuates greatly. By using the measured values ​​of the two-electrode sensor, it is possible to estimate changes in the properties of the garbage as described above that has been put into the incinerator 200.

[0032] In addition, the operating data storage unit 121 is not limited to information relating to the items of "measurement date and time," "first measured value," "second measured value," "pressure value," and "temperature value," and may store information relating to any other operating data.

[0033] The model storage unit 122 stores a plurality of models. Fig. 6 is a diagram illustrating an example of information stored in the model storage unit according to the present disclosure.

[0034] In the example shown in FIG. 6, the model storage unit 122 stores information relating to the items "model ID" and "model data" in association with each other.

[0035] "Model ID" is an identifier for identifying a machine learning model and is represented by a character string, a number, or the like. "Model data" indicates model data of a machine learning model. For example, in the "model data", data for a model that outputs various types of driving support information and information on corrosion conditions when driving data is input is stored. For example, the machine learning model may be a neural network, a Bayesian network, a support vector machine, a soft sensor, or the like.

[0036] 4, the model identified by the model ID "M#1" indicates the machine learning model M#1. Also, the model data "MDT#1" indicates the model data of the machine learning model M#1.

[0037] Here, if the machine learning model is a neural network, the model data "MDT#1" includes various information, such as connection information on how the nodes included in each of the multiple layers that make up the neural network are connected to each other, and connection coefficients that are multiplied by the numerical values ​​input and output between the connected nodes.

[0038] Note that the model storage unit 122 is not limited to storing information related to the items "model ID" and "model data", and may store information related to any other machine learning model.

[0039] The control unit 130 is a controller that manages and controls the control device 100. The control unit 130 is realized by a CPU (Central Processing Unit), an MPU (Micro Processing Unit), or the like executing various programs stored in the storage unit 13 using the RAM as a working area. The control unit 130 may also be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0040] The control unit 130 includes an acquisition unit 131, an estimation unit 132, a determination unit 133, an operation control unit 134, and an operation control unit 135. The control unit 130 realizes these by reading out a program from the storage unit 120 and executing it. That is, these are realized by a set of processes described in the program. The control unit 130 executes these processes by executing it according to the description of the program. The control unit 130 may execute these processes by one CPU, or may be equipped with multiple CPUs and execute these processes by the multiple CPUs.

[0041] The acquisition unit 131 acquires a first measurement value indicating measurement data of the thin ultrasonic sensor and a second measurement value indicating measurement data of the two-electrode sensor. For example, the acquisition unit 131 may acquire the first measurement value and the second measurement value from the thin ultrasonic sensor and the two-electrode sensor, respectively, via a measurement line connected to the communication unit 110. After acquiring the first measurement value and the second measurement value, the acquisition unit 131 stores the acquired first measurement value and second measurement value in the operation data storage unit 121 of the storage unit 120.

[0042] The estimation unit 132 estimates at least one of the state of thinning of the probe 310 and the state of corrosion of the probe 310 based on at least one of the first measurement value and the second measurement value. For example, the estimation unit 132 estimates the amount of thinning of the probe 310 based on the first measurement value. Here, the amount of thinning of the probe 310 means the amount of thinning of the probe 310, which is a dummy superheater tube. Since the probe 310 simulates a superheater tube, the amount of thinning of the probe 310 is considered to be a value that is close to the amount of thinning of the superheater. The first measurement value indicating the measurement data of the thin ultrasonic sensor indicates the thickness of the probe 310. Therefore, the amount of thinning of the probe 310 can be estimated by subtracting the thickness of the probe 310 indicated by the first measurement value from the initial value of the thickness of the probe 310. The estimation unit 132 may also estimate a predicted value of the amount of thinning using a model that is machine-learned from a database that accumulates the first measurement value.

[0043] Also, for example, the estimation unit 132 estimates the corrosion state of the probe 310 based on the second measurement value. The second measurement value indicating the measurement data of the two-electrode sensor indicates the current value flowing between the two electrodes when melting of the attached ash occurs. Therefore, it is considered that the larger the current value indicated by the second measurement value, the more molten material with low electrical resistance is generated. Also, it is considered that the longer the time during which the current value indicated by the second measurement value flows, the more the amount of molten material generated by melting of the attached ash is, and the more current is continuously flowing between the two electrodes. Based on such an estimation, the estimation unit 132 estimates the molten state of the attached ash of the probe 310 based on the second measurement value. Also, the estimation unit 132 may estimate a prediction of the molten state of the attached ash using a model obtained by machine learning a database that accumulates the second measurement value. In addition, the estimation unit 132 may estimate a prediction value of the amount of thinning by learning the correlation between the amount of thinning of the probe and the melting of the attached ash.

[0044] The determination unit 133 determines an operation command for processing the attached ash based on the estimation result of the estimation unit 132. That is, the determination unit 133 determines whether to issue an operation command for processing the attached ash based on the estimation result of the estimation unit 132. ExceptThe determination unit 133 determines an operation command for at least one of the soot device 320 and the incinerator 200. That is, the determination unit 133 determines an operation command for the water injection device 340 and the incinerator 200 based on the amount of thinning and the corrosion state estimated by the estimation unit 132. Except The soot device 320 and at least one of the incinerator 200 are judged to be operated or not, and an operation command including a command to transition the operation state is judged. In other words, the operation command is a command signal indicating an operation command to these devices and equipment.

[0045] For example, the judgment unit 133 judges whether the amount of thinning estimated by the estimation unit 132 is equal to or greater than a predetermined value, or whether the molten material has been in a molten state for a relatively long time, and judges to operate the water injection device 340 if the amount of thinning is equal to or greater than the predetermined value. Here, the predetermined value is a preset value that is a criterion for judging whether to operate the water injection device 340. For example, the predetermined value may be a value that is arbitrarily set statistically based on data accumulated by the operation performance of the heat recovery boiler system 10. Alternatively, the predetermined value may be a value that is arbitrarily set based on an empirical rule established by the long-term experience of the operator of the heat recovery boiler system 10. In addition, the predetermined value may be set to a different value for each probe 310. Note that, since there is a possibility that the target heat recovery amount of the boiler cannot be satisfied due to water injection, in that case, the amount of recovered heat may be adjusted by increasing the processing amount to create a state in which the operating temperature is raised.

[0046] In addition, the judgment unit 133, when it indicates that melting of the attached ash estimated by the estimation unit 132 has occurred or when the progress of the thinning rate is faster than in a normal state, Except For example, when the estimation unit 132 estimates that melting of the adhering ash of the probe 310 has occurred based on the second measurement value, the determination unit 133 determines whether or not the soot device 320 is to be operated. Except A decision is made to operate the soot device 320 .

[0047] In addition, when the estimation unit 132 estimates that melting of the adhering ash has occurred in the plurality of probes 310, the judgment unit 133 judges that the temperature of the incinerator 200 should be lowered within a range that does not cause problems in operation, or that the gas temperature should be lowered by injecting water using the water injection device 340. Here, the number of the plurality of probes 310 may be set to any number based on the past operating records of the heat recovery boiler system 10 of a similar form. For example, in a form in which three heat exchangers 330 are provided in the boiler furnace 300 of the heat recovery boiler system 10, and one probe 310 is provided corresponding to each of the heat exchangers 330, for a total of three probes 310, when melting of the adhering ash is estimated in more than half, i.e., two or more of the probes 310, the judgment unit 133 may judge that the temperature of the incinerator 200 should be lowered within a range that does not cause problems in operation, or that the gas temperature should be lowered by injecting water using the water injection device 340.

[0048] In addition to detecting the melting state of the attached ash by the on or off response, the judgment unit 133 evaluates the melting state of the attached ash as a risk time of molten salt corrosion based on the integral of the number of times the attached ash has melted and the melting time of the attached ash, and uses the evaluation result to Except The operation of the soot device 320 or the water injection device 340 may be determined. That is, the parameter may be evaluated by itself, or may be combined with other parameters. For example, the correlation between the amount of thinning of the probe 310 and the risk time of molten salt corrosion may be used for evaluation. Also, the correlation between the wall thickness measurement results (periodic inspection) of an actual heat transfer tube and the risk time of molten salt corrosion may be used for evaluation.

[0049] The determination unit 133 may also detect (monitor) the amount of thinning of the heat transfer tube and the increase in the amount of melted attached ash, estimate the degree of corrosion of the entire heat recovery equipment based on the detection results, and determine operation based on the degree of corrosion. ExceptThe operation of the soot device 320 and the water injection device 340 may be determined. That is, the ultrasonic sensor and the two-electrode sensor of the probe 310 monitor the amount of thinning of the heat transfer tube and the increase in the amount of melted ash attached to the heat recovery equipment, and estimate the corrosion progress of the entire heat recovery equipment. If the corrosion progress is large, water is sprayed on the upstream side of the heat recovery equipment to reduce the corrosive temperature environment. It is preferable to use wastewater from the plant as the spray water. The corrosion progress may be determined by taking into consideration the detection results of multiple sensors, either the same probe or different probes. In addition to the data acquired by the probe 310, the operating conditions of the boiler (fuel properties, air ratio, evaporation amount, etc.) and the wall thickness measurement results of the actual heat transfer tube (regular inspection results) may also be taken into account. With these, the corrosion rate distribution and its factors based on the relationship between the corrosion rate and the operating conditions can be estimated. Alternatively, it is possible to evaluate and update the estimated results of the corrosion rate distribution of the heat transfer tube in the furnace.

[0050] The operation control unit 134 controls the operation of the treatment for the attached ash based on the judgment result of the judgment unit 133. That is, the operation control unit 134 controls the water injection device 340 and Except The operation control unit 134 controls the operation of at least one of the soot devices 320. For example, when the determination unit 133 determines to operate the water injection device 340 based on the fact that the amount of metal loss is equal to or greater than a predetermined value, the operation control unit 134 controls the operation of the water injection device 340. This makes it possible to reduce the corrosive temperature environment.

[0051] In addition, the operation control unit 134 performs a corresponding process based on the fact that the determination unit 133 estimates that melting of the attached ash has occurred. Except When it is determined that the soot device 320 is to be operated, Except The soot device 320 is operated. Since a plurality of probes 310 are provided, the probe 310 corresponding to the probe 310 where the melting of the attached ash occurs is selected. Except By operating the soot device 320, it is possible to remove the ash adhering to the heat transfer tube of the heat exchanger 330 where melting of the adhering ash is presumed to have occurred.

[0052] The operation control unit 135 controls the operation of the incinerator 200 based on the judgment result of the judgment unit 133. When the operation control unit 135 judges that the temperature of the incinerator 200 should be lowered within a range that does not affect operation, or that the gas temperature should be lowered by injecting water from the water injection device 340, based on the judgment unit 133 estimating that melting of the attached ash has occurred in the multiple probes 310, the operation control unit 135 performs control to lower the operating temperature of the incinerator 200. For example, when the incinerator 200 is a stoker type incinerator, the operation control unit 135 performs control to reduce the amount of air blown from the blower or to reduce the amount of waste input into the incinerator 200.

[0053] The input unit 140 accepts operations of the heat recovery boiler system 10 from an operator. The input unit 140 may be realized by various input devices such as a mouse or a keyboard. The input unit 140 may also be realized by a dedicated operation panel combining a plurality of switches. The heat recovery boiler system 10 operates according to the operations input to the input unit 140 by the operator.

[0054] The display unit 150 is a display device that displays various information such as operation information and operating status of the heat recovery boiler system 10. The display unit 150 receives information to be displayed from the control unit 130 and displays various information based on the received information. This allows the operator of the heat recovery boiler system 10 to grasp the operating status and make decisions and judgments regarding the operation of various devices according to the operating status. The display unit 150 may be realized by a display device such as a liquid crystal display, an organic EL (Electro Luminescence) display, or a micro LED (Light Emitting Diode) display. The display unit 150 may be realized by combining multiple display devices in order to enable the operator to instantly grasp a large amount of information.

[0055] (Control method and program for heat recovery boiler system) Next, a control method and a program for the heat recovery boiler system 10 according to the present disclosure will be described with reference to FIGS.

[0056] (First aspect) 7 is a flowchart showing a flow of a first embodiment of the control method and program for a heat recovery boiler system according to the present disclosure. The control method for the heat recovery boiler system 10 according to the first embodiment will be described with reference to FIG.

[0057] First, the control device 100 acquires measurement data including a first measurement value indicating measurement data of the thin ultrasonic sensor and a second measurement value indicating measurement data of the two-electrode sensor (step S1). Next, the control device 100 estimates at least one of the amount of thinning of the probe 310 and melting of the ash adhering to the probe 310 based on at least one of the first measurement value and the second measurement value (step S2). Next, the control device 100 judges whether the amount of thinning is equal to or greater than a predetermined value (step S3). Next, if the amount of thinning is equal to or greater than a predetermined value (step S3: Yes), the control device 100 controls to operate the water injection device 340 (step S4). Note that if the amount of thinning is not equal to or greater than the predetermined value (step S3: No), the control device 100 ends the process. These processes may be written in a program to be executed by a computer included in the control device 100, and the computer may execute the process by the program.

[0058] This allows the following to be done depending on the amount of thinning and the melting of the adhering ash: Except Therefore, the operation of the soot device 320 can be appropriately controlled according to the monitoring of the probe 310. Except Operation of the soot device 320 can then be carried out.

[0059] (Second aspect) 8 is a flowchart showing a flow of a second embodiment of the control method and program for a heat recovery boiler system according to the present disclosure. The control method for the heat recovery boiler system 10 according to the second embodiment will be described with reference to FIG.

[0060] In the control method for the heat recovery boiler system 10 of the second embodiment, steps S10 to S20 are performed in the same manner as steps S1 to S2 of the control method for the heat recovery boiler system 10 of the first embodiment. Next, the control device 100 determines whether or not melting of the adhering ash has occurred (step S30). When it is determined that melting of the adhering ash has occurred (step S30: Yes), the control device 100 Except The soot device 320 is operated (step S40). When it is determined that melting of the adhering ash has not occurred (step S30: No), the control device 100 ends the process. These processes may be written in a program to be executed by a computer included in the control device 100, and the computer may execute the processes by the program.

[0061] This allows the following: When the adhering ash melts, Except Therefore, the soot device 320 can be operated appropriately in response to the monitoring of the probe 310. Except Operation of the soot device 320 can then be carried out.

[0062] (Third aspect) 9 is a flowchart showing a flow of a third aspect of the control method and program for a heat recovery boiler system according to the present disclosure. The control method for the heat recovery boiler system 10 according to the third aspect will be described with reference to FIG.

[0063] The control method for the heat recovery boiler system 10 of the third embodiment executes the same processes from step S100 to step S200 as those from step S1 to step S2 of the control method for the heat recovery boiler system 10 according to the first embodiment. Next, the control device 100 judges whether the amount of thinning of the probes 310 at a plurality of points is equal to or greater than a predetermined value (step S300). If the amount of thinning of the plurality of probes 310 is equal to or greater than a predetermined value (step S300: Yes), the control device 100 controls to lower the operating temperature (step S400). If the amount of thinning of the plurality of probes 310 is not equal to or greater than a predetermined value (step S300: No), the control device 100 ends the process. These processes may be written in a program executed by a computer included in the control device 100, and the computer may execute the process by the program.

[0064] This allows operation at a reduced operating temperature when melting of adhering ash occurs in the multiple probes 310. This makes it possible to reduce the risk of high-temperature corrosion due to exposure to a high-temperature environment.

[0065] (Composition and Effects) The present disclosure discloses the following inventions, but is not limited to the following. (1) An acquisition unit 131 that acquires a first measurement value indicating measurement data of the ultrasonic sensor and a second measurement value indicating measurement data of the two-electrode sensor, an estimation unit 132 that estimates at least one of the amount of thinning of the probe 310 and the melting of ash adhering to the probe 310 based on at least one of the first measurement value and the second measurement value, and a water injection device as a treatment for the adhering ash based on the estimation result of the estimation unit 132. Except A control device for a heat recovery boiler system comprising a judgment unit (133) that judges an operation command for at least one of the soot devices, and an operation control unit (134) that controls the operation of treatment for the attached ash based on the judgment result of the judgment unit (133).

[0066] According to this configuration, it is possible to provide a control device capable of suppressing corrosion by monitoring the corrosion state in real time.Except By controlling either the soot device 320 or the combustion furnace, the process of reducing and removing the attached ash can be appropriately performed.

[0067] (2) A control device for a heat recovery boiler system described in (1), wherein the judgment unit 133 judges, when the amount of thinning of the probe 310 estimated by the estimation unit 132 is equal to or greater than a predetermined value, to operate the water injection device 340 corresponding to the probe 310 for which the amount of thinning of the probe 310 is estimated to be equal to or greater than a predetermined value.

[0068] According to this configuration, when the thickness of the probe 310 is reduced, the corrosive temperature environment can be reduced by operating the water injection device 340.

[0069] (3) When the estimation unit 132 estimates that the ash adhering to the probe 310 has melted, the determination unit 133 determines whether the ash adhering to the probe 310 has melted. Except The control device for a heat recovery boiler system according to (1) or (2), which determines to operate the soot device 320.

[0070] According to this configuration, when melting of the adhering ash is estimated, the probe 310 corresponding to the melting of the adhering ash is Except It is possible to remove the attached ash by operating the soot device 320. Therefore, it is possible to provide the control device 100 for the heat recovery boiler system 10 capable of suppressing corrosion.

[0071] (4) The control device for a heat recovery boiler system described in any one of (1) to (3), further comprising an operation control unit 135, wherein the judgment unit 133 judges that the operating temperature of the combustion furnace should be lowered when the estimation unit 132 estimates that the adhering ash has melted in the multiple probes, and controls the operation of the combustion furnace based on the judgment result of the judgment unit 133.

[0072] According to this configuration, when melting of adhering ash occurs in the multiple probes 310, the operating temperature of the combustion furnace can be lowered. Therefore, it is possible to provide the control device 100 for the heat recovery boiler system 10 capable of suppressing corrosion.

[0073] (5) The judgment unit 133 detects the melting state of the attached ash by an on or off response, and evaluates it as a molten salt corrosion risk time from the integral of the number of times the attached ash has melted and the melting time of the attached ash, and uses the evaluation result to Except The control device for a heat recovery boiler system according to any one of (1) to (4), which determines the operation of a soot device (320) or a water injection device (340).

[0074] According to this configuration, it is possible to provide a heat recovery boiler system 10 capable of suppressing corrosion by monitoring the corrosion state in real time.

[0075] (6) The judgment unit 133 detects the amount of thinning of the heat transfer tube and the increase in the amount of melted attached ash, and estimates the degree of corrosion of the entire heat recovery equipment based on the detection result, and based on the degree of corrosion, Except A control device for a heat recovery boiler system according to any one of (1) to (5), which determines the operation of a soot device or a water injection device.

[0076] According to this configuration, it is possible to provide a heat recovery boiler system 10 capable of suppressing corrosion by monitoring the corrosion state in real time.

[0077] (7) A step of acquiring a first measurement value indicating measurement data of the ultrasonic sensor and a second measurement value indicating measurement data of the two-electrode sensor; a step of estimating at least one of the amount of thinning of the probe 310 and melting of the ash adhering to the probe 310 based on at least one of the first measurement value and the second measurement value; a step of determining the operation of a treatment for the adhering ash based on the estimation result; and a step of using a water injection device as a treatment for the adhering ash based on the determination result. Exceptand controlling operation of at least one of the soot devices.

[0078] According to this configuration, it is possible to provide a control method for the heat recovery boiler system 10 that is capable of suppressing corrosion by monitoring the corrosion state in real time.

[0079] (8) A step of acquiring a first measurement value indicating measurement data of the ultrasonic sensor and a second measurement value indicating measurement data of the two-electrode sensor, a step of estimating at least one of the amount of thinning of the probe 310 and melting of the ash adhering to the probe 310 based on at least one of the first measurement value and the second measurement value, a step of determining operation of a treatment for the adhering ash based on the estimation result, and a step of performing treatment for the adhering ash based on the determination result, and a water injection device; Except and controlling the operation of at least one of the soot devices.

[0080] According to this configuration, it is possible to provide a program capable of suppressing corrosion by monitoring the corrosion state in real time.

[0081] Although the embodiment according to the present disclosure has been described above, the embodiment is not limited by the contents of this embodiment. In addition, the above-mentioned components include those that a person skilled in the art can easily imagine, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the above-mentioned components can be appropriately combined. Furthermore, various omissions, substitutions, or modifications of the components can be made without departing from the gist of the above-mentioned embodiment. [Explanation of symbols]

[0082] 10. Heat recovery boiler system 100 Control device 110 Communications Department 120 Storage section 121 Operation data storage unit 122 Model Memory Section 130 Control section 131 Acquisition Department 132 Estimation Department 133 Judgment Department 134 Operation control section 135 Operation control unit 140 Input section 150 Display section 200 Incinerator 300 Boiler furnace 310 High Temperature Corrosion Monitoring Probe (Probe) 320 Except soot equipment 330 heat exchanger

Claims

1. an acquisition unit that acquires a first measurement value indicating measurement data of the ultrasonic sensor and a second measurement value indicating measurement data of the two-electrode sensor; An estimation unit that estimates the amount of thinning of the probe and the melting of ash adhering to the probe using a model that is machine-learned from a database that accumulates at least one of the first measurement value and the second measurement value; A determination unit that determines an operation command for processing the wall thinning and the adhered ash based on the estimation result of the estimation unit; An operation control unit that controls the operation of at least one of the water injection device and the soot removal device based on the judgment result of the judgment unit as a treatment for thinning and attached ash, The determination unit determines to operate a water injection device or a soot removal device provided upstream of the gas flow corresponding to the probe when the amount of thinning of the probe estimated by the estimation unit is equal to or greater than a predetermined value, When the estimation unit estimates that the ash adhering to the probe has melted, the estimation unit determines to operate a water injection device or a soot removal device that is provided upstream of the gas flow with respect to the probe. Heat recovery boiler system control device.

2. The determination unit determines to lower an operating temperature of the combustion furnace when the estimation unit estimates that the attached ash has melted in the multiple probes, and An operation control unit that controls the operation of the combustion furnace based on the judgment result of the judgment unit, The control device for a heat recovery boiler system according to claim 1 .

3. The judgment unit detects the melting state of the attached ash by an on or off response, and evaluates the molten salt corrosion risk time from the integral of the number of times the attached ash has melted and the melting time of the attached ash, and judges the operation of the soot removal device or the water injection device using the evaluation result. The control device for a heat recovery boiler system according to claim 1 .

4. The judgment unit detects the amount of thinning of the heat transfer tube and the increase in the amount of melted ash adhered to the heat transfer tube, estimates the degree of corrosion of the entire heat recovery equipment based on the detection result, and judges the operation of the soot removal device or the water injection device based on the degree of corrosion. The control device for a heat recovery boiler system according to claim 1 .

5. Obtaining a first measurement value indicative of measurement data of the ultrasonic sensor and a second measurement value indicative of measurement data of the two-electrode sensor; A step of estimating the amount of thinning of the probe and the melting of ash adhering to the probe using a model obtained by machine learning of a database in which at least one of the first measurement value and the second measurement value is stored; A step of determining an operation command for processing the wall thinning and the attached ash based on the estimation result; and controlling the operation of at least one of the water injection device and the soot removal device based on the judgment result as a treatment for the thinning and the attached ash. In the determining step, when the amount of thinning of the probe estimated in the estimating step is equal to or greater than a predetermined value, it is determined to operate a water injection device or a soot removal device provided upstream of the gas flow corresponding to the probe; In the step of estimating, when it is estimated that the ash adhering to the probe has melted, it is determined to operate a water injection device or a soot removal device provided upstream of the gas flow with respect to the probe. A method for controlling a heat recovery boiler system.

6. Obtaining a first measurement value indicative of measurement data of the ultrasonic sensor and a second measurement value indicative of measurement data of the two-electrode sensor; A step of estimating the amount of thinning of the probe and the melting of ash adhering to the probe using a model obtained by machine learning of a database in which at least one of the first measurement value and the second measurement value is stored; A step of determining an operation command for processing the wall thinning and the attached ash based on the estimation result; and controlling the operation of at least one of the water injection device and the soot removal device based on the judgment result as a treatment for the thinning and the attached ash. In the determining step, when the amount of thinning of the probe estimated in the estimating step is equal to or greater than a predetermined value, it is determined to operate a water injection device or a soot removal device provided upstream of the gas flow corresponding to the probe; in the step of estimating, when it is estimated that the ash adhering to the probe has melted, determining to operate a water injection device or a soot removal device provided upstream of the gas flow with respect to the probe; A program that causes a computer to execute the following.

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