Concentration calculation device, combustion control device, concentration calculation method and concentration calculation program

Abstract

To suitably calculate a concentration of ammonia included in exhaust gas discharged from an engine that burns ammonia.SOLUTION: A concentration calculation device includes: a data acquisition section that acquires operation data on a plurality of operation parameters other than an unburned ammonia concentration of an engine; a storage section that stores a calculation rule that is calculated on the basis of relation between the operation data on the operation parameters and an ammonia concentration at a specific position of exhaust gas and that uses the engine operation data as input and the ammonia concentration at the specific position as output; and a calculation section that calculates the ammonia concentration of exhaust gas at the specific position by processing the operation data acquired by the data acquisition section by using the calculation rule stored by the storage section.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a concentration calculation device for detecting the concentration of ammonia, a combustion control device, a concentration calculation method, and a concentration calculation program. [Background technology]

[0002] In fuel-burning engines, the use of ammonia, a carbon-free fuel that produces fewer harmful substances (such as carbon dioxide), is being considered.

[0003] Some engines are equipped with exhaust gas treatment systems that supply urea, ammonia, or the like to exhaust gas in order to reduce nitrogen oxides contained in the emitted exhaust gas. Engines that reduce nitrogen oxides with ammonia or the like may measure the ammonia concentration to control the exhaust gas treatment. Patent Document 1 describes a treatment system that adds urea to exhaust gas, reduces it in an SCR catalyst, and then treats it in an ASC. In Patent Document 1, the ammonia concentration is measured downstream of the SCR catalyst, and the nitrogen oxide concentration is measured downstream of the ASC, and the amount of reducing agent supplied is controlled based on the measurement results of the nitrogen oxides and ammonia. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-20376 Summary of the Invention [Problem to be solved by the invention]

[0005] In engines that burn ammonia, unburned ammonia may be contained in exhaust gas due to combustion in the engine. The ammonia generated in such engines is generated for a reason different from the ammonia component supplied in exhaust gas treatment, as described in Patent Document 1.

[0006] The present disclosure is devised to solve the above-described problems, and aims to provide a concentration calculation device, a combustion control device, a concentration calculation method, and a concentration calculation program that can suitably calculate the concentration of ammonia contained in exhaust gas emitted from an engine that burns ammonia. [Means for solving the problem]

[0007] In order to achieve the above object, the concentration calculation device disclosed herein is a concentration calculation device that calculates the ammonia concentration of exhaust gas emitted from an engine that burns ammonia, and includes: a data acquisition unit that acquires operating data of a plurality of operating parameters other than the unburned ammonia concentration of the engine; a memory unit that stores a calculation rule that takes engine operating data as input and outputs the ammonia concentration at the specific position, the calculation rule being calculated based on the relationship between the operating data of the operating parameters and the ammonia concentration at the specific position in the exhaust gas; and a calculation unit that processes the operating data acquired by the data acquisition unit using the calculation rule stored in the memory unit to calculate the ammonia concentration of the exhaust gas at the specific position.

[0008] Furthermore, the concentration calculation method disclosed herein is a concentration calculation method for calculating the ammonia concentration of exhaust gas emitted from an engine that burns ammonia, and includes the steps of: acquiring a calculation rule that takes engine operation data as input and outputs the ammonia concentration at the specific position, the calculation rule being calculated based on the relationship between operation data of operation parameters and the ammonia concentration of the exhaust gas at a specific position; acquiring operation data of a plurality of operation parameters other than the unburned ammonia concentration of the engine; and processing the operation data acquired by the data acquisition unit using the calculation rule stored in the storage unit to calculate the ammonia concentration of the exhaust gas at the specific position.

[0009] Furthermore, the concentration calculation program disclosed herein is a concentration calculation program that calculates the ammonia concentration of exhaust gas emitted from an engine that burns ammonia, and causes a computer to execute processing including the steps of: acquiring a calculation rule that takes engine operation data as input and outputs the ammonia concentration at the specific position, the calculation rule being calculated based on the relationship between operation data of operation parameters and the ammonia concentration at a specific position in the exhaust gas; acquiring operation data of a plurality of operation parameters other than the unburned ammonia concentration of the engine; and processing the operation data acquired by the data acquisition unit using the calculation rule stored in the storage unit to calculate the ammonia concentration of the exhaust gas at the specific position. [Effects of the Invention]

[0010] According to the present disclosure, it is possible to suitably detect the concentration of ammonia contained in exhaust gas emitted from an engine that burns ammonia. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a block diagram showing an example of a combustion system according to the first embodiment. [Figure 2] FIG. 2 is a flowchart showing an example of processing performed by the ammonia concentration calculation device. [Figure 3] FIG. 3 is a flowchart showing an example of processing by the combustion control device. [Figure 4] FIG. 4 is a block diagram showing an example of a program creation system. [Figure 5] FIG. 5 is a block diagram showing an example of a calculation program creating device. [Figure 6] FIG. 6 is an explanatory diagram illustrating an example of the teacher data. [Figure 7] FIG. 7 is a flowchart illustrating an example of processing by the calculation program creating device. [Figure 8] FIG. 8 is a block diagram showing an example of a combustion system according to the second embodiment. [Figure 9] FIG. 9 is a flowchart showing an example of processing by the combustion control device. [Figure 10] FIG. 10 is a block diagram showing an example of a combustion system according to the third embodiment. [Figure 11] FIG. 11 is a flowchart showing an example of processing by the combustion control device. [Figure 12] FIG. 12 is a block diagram showing an example of a combustion system according to the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to these embodiments, and when there are multiple embodiments, the present disclosure also includes configurations that combine the embodiments. Furthermore, the components in the embodiments include those that can be easily imagined by a person skilled in the art, those that are substantially identical, and those that are within the so-called equivalent range.

[0013] [First embodiment] <Combustion system> Fig. 1 is a block diagram showing an example of a combustion system according to a first embodiment. The combustion system 10 shown in Fig. 1 burns ammonia as fuel. The combustion system 10 includes an engine 12, an ammonia supply device 14, a fuel supply device 16, an air supply device 18, an exhaust pipe 20, an SCR (Selective Catalytic Reduction) catalyst 22, an ASC (Ammonia Slip Catalyst) 24, and a combustion control device 29. The combustion control device 29 includes a control device 30 and an ammonia concentration calculation device 40.

[0014] The engine (engine body) 12 is a device that rotates a rotating shaft using energy generated by burning ammonia, and is, for example, a multi-cylinder engine that serves as a driving source for a moving body or a driving source for rotating the rotating shaft of a generator. A multi-cylinder engine has pistons movably supported in multiple cylinder bores. The engine 12 is provided with intake valves and exhaust valves that open and close the intake and exhaust ports, respectively. The engine 12 is also provided with fuel injection valves that inject fuel into each combustion chamber, and spark plugs that ignite the fuel. The type of engine 12 is not particularly limited, as long as it can burn ammonia.

[0015] The ammonia supply device 14 supplies ammonia to the engine 12. Ammonia is a carbon-free fuel that emits fewer greenhouse gases, including carbon dioxide, than hydrocarbon fuels. The ammonia supply device 14 includes a tank for storing ammonia, piping connecting the tank to the engine 12, a control valve for adjusting the pressure and supply amount of ammonia supplied to the engine 12, and the like. Some of the functions of the ammonia supply device 14 may be disposed inside the engine 12.

[0016] The fuel supply device 16 supplies fuel to the engine 12. The fuel is a fuel other than ammonia that is easier to ignite than ammonia, such as diesel oil. The fuel may be a fossil fuel other than diesel oil, a biofuel, or the like. The fuel supply device 16 includes a tank for storing the fuel, piping connecting the tank and the engine 12, a control valve for adjusting the pressure and amount of fuel supplied to the engine 12, and the like. Some of the functions of the fuel supply device 16 may be arranged inside the engine 12.

[0017] The air supply device 18 supplies air to the engine 12. The air supply device 18 has a pipe that guides outside air and an adjusting unit that adjusts the supply of the incoming air to the engine 12. A control valve or the like can be used as the adjusting unit.

[0018] The exhaust pipe 20 is a pipe connected to the engine 12, through which exhaust gas generated by combustion of ammonia and the like in the engine 12 flows.

[0019] The SCR catalyst 22 and ASC 24 are exhaust gas treatment devices that convert ammonia, specifically unburned ammonia, contained in exhaust gas flowing through the exhaust pipe into other substances. The SCR catalyst 22 is disposed downstream of the engine 12 in the exhaust pipe 20. The SCR catalyst 22 is a selective reduction catalyst that promotes the reaction between ammonia and nitrogen oxides. The SCR catalyst 22 supports, as an active component, for example, vanadium, molybdenum, tungsten, or zeolite.

[0020] The ASC 24 is disposed downstream of the SCR catalyst 22 in the exhaust pipe 20. The ASC 24 oxidizes ammonia contained in the exhaust gas. Note that the devices disposed in the exhaust pipe 20 are not limited to the SCR catalyst 22 and the ASC 24, and various devices for treating exhaust gas may be disposed.

[0021] The combustion control device 29 has a control device 30 and an ammonia concentration calculation device 40, and controls the operation of the engine 12. The control device 30 is an ECU (Electronic Control Unit). The control device 30 is connected to each part of the engine 12. The control device 30 is connected to sensors that acquire the state of the engine 12 and the environment around the engine. The control device 30 is connected to the ammonia concentration calculation device 40. The control device 30 acquires input values ​​from an operation unit, such as an accelerator, that inputs the operating conditions of the engine 12. Note that the operating conditions of the engine 12 may be acquired from a computing device rather than from the operation unit. The control device 30 determines the operating conditions of the engine 12 based on the state of the engine 12, the environment around the engine, and operating commands, and controls the operation of the engine 12 based on the determined operating conditions. The control device 30 controls the opening and closing timing of the fuel injection valve, the opening and closing timing of the intake port and exhaust port by the intake valve and exhaust valve, the opening and closing of each valve, etc., and controls the supply amount, supply timing, air supply amount, supply pressure, etc. of ammonia and fuel.

[0022] <Ammonia concentration calculation device> The ammonia concentration calculation device 40 calculates the ammonia concentration at a specific position in the exhaust piping 20 by calculation based on the operating conditions of the engine 12 acquired from the control device 30. In other words, the ammonia concentration calculation device 40 is a software sensor that calculates the ammonia concentration at a specific position without measuring the ammonia concentration at the specific position with a physical sensor. By setting calculation conditions in advance, the specific position can be set to various positions in the exhaust piping 20, for example, between the engine 12 and the SCR catalyst 22, i.e., a position upstream of the exhaust gas treatment device, or downstream of the ASC 24, i.e., a position downstream of the exhaust gas treatment device.

[0023] The ammonia concentration calculation device 40 has an operating data acquisition unit 42, a calculation unit 44, and a storage unit 46. The operating data acquisition unit 42 acquires operating data such as detection of the engine 12 acquired by the control device 30 and control values ​​for the engine 12 generated by the control device 30. The operating data acquired by the operating data acquisition unit 42 are parameter values ​​used to calculate the ammonia concentration.

[0024] Here, examples of the parameters of the engine 12 include engine speed, intake manifold pressure, intake manifold temperature, exhaust pressure, exhaust temperature, intake air temperature, intake air pressure, fuel flow rate, ammonia flow rate, measured in-cylinder pressure, IMEP (Indicated Mean Effective Pressure) calculated from the in-cylinder pressure, maximum in-cylinder pressure, ECU setting value, etc.

[0025] Here, the plurality of operating parameters is preferably one parameter selected from operating parameters that are highly correlated with each other, and is a combination of parameters whose correlation with the unburned ammonia concentration is equal to or greater than a threshold value and whose correlation with each other is equal to or less than another threshold value, i.e., a combination of parameters that are highly correlated with the unburned ammonia concentration in the exhaust gas and in which the selected parameters do not have a strong correlation with each other. By combining the above parameters, the ammonia concentration can be calculated with high accuracy. Note that the correlation between the parameters can be obtained by performing a correlation analysis on the parameters of the acquired data. The acquired data may be data on the operation of the engine 12, including the results of actual measurements of the ammonia concentration, or the results of a simulation.

[0026] The operating parameters preferably combine four values: a value related to the combustion material input to the engine, a value related to the air input to the engine, a value related to the combustion pressure of the engine, and a value related to the pressure or temperature of the gas flowing through the engine. A value related to air temperature may also be included. Furthermore, a main parameter indicating the operating state of the engine, such as the engine speed, may also be included.

[0027] Examples of values ​​related to the combustibles fed into the engine include the ammonia co-firing ratio (calorie basis), the amount of ammonia supplied, and the amount of fuel supplied. Examples of values ​​related to the air fed into the engine include the coefficient of variation (cov) value of the indicated mean effective pressure (IMEP). Examples of values ​​related to the engine combustion pressure include the exhaust pressure and the boost pressure. Examples of values ​​related to the pressure of the air flowing through the engine include the excess air ratio.

[0028] The calculation unit 44 is a calculation device and includes a calculation circuit such as a CPU. The calculation unit 44 processes the data acquired by the operation data acquisition unit 42 and calculates the ammonia concentration in the exhaust gas at a specific position in the exhaust piping 20.

[0029] The storage unit 46 is a memory that stores various information such as the calculation contents and programs of the calculation unit 44, and includes, for example, at least one of a RAM, a main storage device such as a ROM, and an external storage device such as a HDD. The storage unit 46 stores a trained program 48. The trained program 48 is a program that has undergone machine learning by inputting operating data of identified parameters of the engine 12 and outputting the ammonia concentration at a specific position in the exhaust pipe 20.

[0030] The ammonia calculation process of the ammonia concentration calculation device 40 will be described with reference to Fig. 2. Fig. 2 is a flowchart showing an example of the process of the ammonia concentration calculation device. The process of Fig. 2 can be executed by the calculation unit 44 performing various processes.

[0031] The calculation unit 44 acquires the learned program from the storage unit 46 (step S12). The calculation unit 44 acquires operating data of target operating parameters of the engine 12 (step S14). The calculation unit 44 inputs the operating data of the engine operating parameters into the learned program and calculates the ammonia concentration (step S16). The calculation unit 44 outputs the calculated ammonia concentration to the control device 30 (step S18). The calculation unit 44 determines whether the calculation is complete (step S20). If the calculation unit 44 determines that the calculation is not complete (No in step S20), it returns to step S14 and repeats the ammonia concentration calculation process. If the calculation unit 44 determines that the calculation is complete (Yes in step S20), it terminates this process.

[0032] The ammonia concentration calculation device 40 acquires operating data of specific parameters obtained from the control device 30 and processes the data using a learned program, thereby calculating the ammonia concentration at a specific position in the exhaust piping 20 through calculation processing.

[0033] Next, a description will be given of the processing of the combustion control device 29 by the control device 30 using the calculation result of the ammonia concentration calculation device 40. Fig. 3 is a flowchart showing an example of the processing of the combustion control device.

[0034] The control device 30 acquires target operating values ​​for the engine (step S22). The control device 30 acquires the ammonia concentration from the ammonia concentration calculation device 40 (step S24). The control device 30 calculates an operating command value based on the calculated ammonia concentration value, the target operating values, and other operating data (step S26). The control device 30 controls each part of the engine based on the operating command value (step S28).

[0035] The combustion control device 29 controls the engine 12 using the control device 30 based on the calculation results of the ammonia concentration calculation device 40. This allows the engine 12 to calculate the ammonia concentration without using a physical sensor to detect the ammonia concentration, thereby enabling operation while suppressing ammonia leakage. For example, the combustion control device 29 can increase the fuel supply amount when the calculated conditions for ammonia emission are met. The combustion control device 29 may also switch from ammonia and fuel co-combustion to exclusive fuel combustion. When the ammonia concentration is high, the combustion control device 29 may adjust the excess air ratio, advance the fuel injection timing in the combustion cycle, control the ignition timing, or adjust the intake air temperature. The excess air ratio can be adjusted by controlling the intake air amount (control targets include the intake throttle valve opening, the turbocharger wastegate / VG nozzle opening, the exhaust throttle valve opening, and the VVT ​​setting) or the fuel flow rate. The ignition timing is controlled by controlling the ignition timing in the case of spark ignition, or the fuel injection pattern (injection timing, number of injection stages, common rail pressure, and injection amount) in the case of compression ignition. The temperature control is performed by controlling the set temperature of the discharge gas using an intercooler.

[0036] <Program creation system> Next, an example of creating a trained program used to calculate an ammonia concentration will be described. Fig. 4 is a block diagram showing an example of a program creation system. Fig. 5 is a block diagram showing an example of a calculation program creation device.

[0037] The program creation system 100 has an engine 12, an ammonia supply device 14, a fuel supply device 16, an air supply device 18, an exhaust pipe 20, an SCR (Selective Catalytic Reduction) catalyst 22, an ASC (Ammonia Slip Catalyst) 24, a combustion control device 29, a control device 30, a calculation program creation device 70, ammonia concentration sensors 102, 104, and a temperature sensor 106. The engine 12, the ammonia supply device 14, the fuel supply device 16, the air supply device 18, the exhaust pipe 20, the SCR (Selective Catalytic Reduction) catalyst 22, the ASC (Ammonia Slip Catalyst) 24, the combustion control device 29, and the control device 30 of the program creation system 100 are devices similar to the respective parts of the combustion system 10.

[0038] The ammonia concentration sensor 102 measures the ammonia concentration of exhaust gas in the exhaust pipe 20 between the engine 12 and the SCR catalyst 22. The ammonia concentration sensor 104 measures the ammonia concentration of exhaust gas in the exhaust pipe 20 downstream of the ACS 24. A vehicle-mounted emission measurement system (PEMS), a constant potential sensor, or the like can be used as the ammonia concentration sensors 102, 104. The temperature sensor 106 measures the temperature of exhaust gas in the exhaust pipe 20 downstream of the ACS 24. Note that, although the present embodiment includes the ammonia concentration sensors 102, 104 and the temperature sensor 106, it is sufficient to measure the ammonia concentration at a specific position where the ammonia concentration is to be calculated, so only one of the ammonia concentration sensors 102, 104 may be used, or the temperature sensor 106 may not be provided.

[0039] The program creation system 100 measures the relationship between the operating conditions of the engine 12 operated in the combustion system 10 and the ammonia concentration at a specific location, and processes the measurement results in the program creation device 70 to create a learned program.

[0040] The calculation program creation device 70 has an operating data acquisition unit 72, an ammonia concentration acquisition unit 74, a calculation unit 76, and a storage unit 78. The operating data acquisition unit 42 acquires operating data such as detection of the engine 12 acquired by the control device 30 and control values ​​for the engine 12 generated by the control device 30. The operating data acquired by the operating data acquisition unit 42 are parameter values ​​used to calculate the ammonia concentration. The ammonia concentration acquisition unit 74 acquires data on the ammonia concentration measured by the ammonia concentration sensors 102, 104.

[0041] The calculation unit 76 is a calculation device and includes a calculation circuit such as a CPU. The calculation unit 76 has a machine learning unit 80 and a data creation unit 82. The machine learning unit 80 performs deep learning using a neural network or the like. The machine learning unit 80 receives data acquired by the operation data acquisition unit 42 as input and creates a learned program that outputs data on the ammonia concentration in the exhaust gas at a specific position in the exhaust piping 20. The data creation unit 82 creates learning data that associates the data acquired by the operation data acquisition unit 42 with the data on the ammonia concentration in the exhaust gas at a specific position in the exhaust piping 20.

[0042] The storage unit 78 is a memory that stores various information such as the calculation contents and programs of the calculation unit 76, and includes, for example, at least one of a RAM, a main storage device such as a ROM, and an external storage device such as a HDD. The storage unit 78 stores a learning program 90 and training data 92. The learning program 90 is a machine learning program that inputs operating data of specified parameters of the engine 12 and creates a trained program that outputs the ammonia concentration at a specified position in the exhaust pipe 20.

[0043] The teacher data 92 is data to be learned by the learning program 90. FIG. 6 is an explanatory diagram showing an example of the teacher data. The teacher data 92 is data in which operation data and detection results of ammonia concentration are stored in chronological order. The operation data in FIG. 6 is the ammonia mixed crystal ratio, the cov value (coefficient of variation) of the indicated mean effective pressure (IMEP), the exhaust pressure, and the excess air factor. Note that, although the present embodiment uses time-series data, it is sufficient if the data is a combination of operation data and detection results of the ammonia concentration at the corresponding time.

[0044] FIG. 7 is a flowchart showing an example of the processing of the calculation program creation device. The calculation program creation device 70 executes each processing of FIG. 7 using the calculation unit 76. The calculation unit 76 acquires operating parameters, i.e., operating data of the operating parameters used to calculate ammonia (step S40). The calculation unit 76 acquires ammonia measurement results at a specific position (step S42). The calculation unit 76 creates training data (step S44). That is, the calculation unit 76 causes the data creation unit 82 to create data that associates the operating data with the ammonia concentration measurement results. The data creation unit 82 stores the created data in the memory unit 78. The calculation unit 76 performs learning using the training data and creates a learned program (step S46).

[0045] In the above embodiment, the data acquired by measuring the ammonia concentration sensors 102 and 104 while operating the actual device was used as the learning data, but the learning data may also be created by simulation.

[0046] In the above embodiment, machine learning is used to create a trained program that calculates the ammonia concentration based on the operating data of specific engine parameters, but the present invention is not limited to this. It is sufficient that the combustion control device can use a calculation rule that calculates the ammonia concentration based on the operating data of specific engine parameters, and the calculation rule may be calculated by regression analysis.

[0047] [Second embodiment] 8 is a block diagram showing an example of a combustion system according to the second embodiment. Note that members having the same functions as those in the first embodiment described above are given the same reference numerals, and detailed description thereof will be omitted.

[0048] A combustion system 10a shown in FIG. 8 includes an engine 12, an ammonia supply device 14, a fuel supply device 16, an air supply device 18, an exhaust pipe 20, an SCR (Selective Catalytic Reduction) catalyst 22, an ASC (ammonia slip catalyst) 24, a combustion control device 29a, and a temperature sensor 122. The combustion control device 29a includes a control device 30, an ammonia concentration calculation device 40, and a treated gas temperature calculation device 120.

[0049] The temperature sensor 122 measures the temperature of the exhaust gas flowing through the exhaust pipe downstream of the engine 12 and upstream of the SCR catalyst. In other words, the temperature sensor 122 measures the temperature of the exhaust gas before it flows into the exhaust gas treatment device.

[0050] The post-treatment exhaust gas temperature calculation device 70 calculates the temperature of the treated exhaust gas, that is, the temperature of the exhaust gas after passing through the ASC 24, based on the ammonia concentration calculated by the ammonia concentration calculation device 40 and the calculation result of the temperature of the temperature sensor 122. The post-treatment exhaust gas temperature calculation device 70 calculates the reaction heat generated in the SCR catalyst 22 and the ASC 24 based on the ammonia concentration, calculates the temperature rise in the exhaust gas treatment device, and calculates the temperature of the exhaust gas after passing through the ASC 24.

[0051] Next, as the processing of the combustion control device 29, a description will be given of the processing of the control device 30 using the calculation result of the ammonia concentration calculation device 40 and the detection result of the temperature sensor 122. Fig. 9 is a flowchart showing an example of the processing of the combustion control device.

[0052] In the combustion control device 29, the treated gas temperature calculation device 120 acquires the ammonia concentration from the ammonia concentration calculation device 40 (step S50). In the combustion control device 29, the treated gas temperature calculation device 120 acquires the pre-treatment exhaust gas temperature from the temperature sensor 122 (step S52). In the combustion control device 29, the treated gas temperature calculation device 120 calculates the treated exhaust gas temperature (step S54). In the combustion control device 29, the control device 30 controls the operating conditions based on the treated exhaust gas temperature and the operating conditions of the catalyst (step S56). For example, when the treated exhaust gas temperature is higher than the allowable temperature of the operating conditions of the catalyst, the combustion control device 29 performs control to reduce the ammonia concentration in the exhaust gas.

[0053] The combustion control device 29 executes processing using the calculated ammonia concentration and the measurement results of the temperature sensor, thereby making it possible to prevent the load on the catalyst from increasing and to extend the life of the catalyst.

[0054] In the above embodiment, the post-treatment exhaust gas temperature is calculated based on the measured value of the exhaust gas temperature before treatment in the exhaust gas treatment device and the calculated value of the ammonia concentration, but the post-treatment exhaust gas temperature may be calculated by calculation based on the calculated value of the ammonia concentration without using the measured value of the exhaust gas temperature before treatment in the exhaust gas treatment device. Also, the program creation system 100 may perform machine learning using the operating data, the measurement results of the ammonia concentration sensor 102, and the measurement results of the temperature sensor 106 to determine a calculation rule.

[0055] [Third embodiment] 10 is a block diagram showing an example of a combustion system according to the third embodiment. Note that members having the same functions as those in the first embodiment described above are given the same reference numerals, and detailed description thereof will be omitted.

[0056] A combustion system 10b shown in FIG. 10 has an engine 12, an ammonia supply device 14, a fuel supply device 16, an air supply device 18, an exhaust pipe 20, an SCR (Selective Catalytic Reduction) catalyst 22, an ASC (ammonia slip catalyst) 24, a combustion control device 29a, and an ammonia concentration sensor 130. The combustion control device 29b has a control device 30, an ammonia concentration calculation device 40, and a difference detector 132.

[0057] The ammonia concentration sensor 130 measures the ammonia concentration of the exhaust gas in the exhaust pipe 20 between the engine 12 and the SCR catalyst 22 .

[0058] The difference detector 132 calculates the difference between the ammonia concentration calculated by the ammonia concentration calculation device 40 and the ammonia concentration measured by the ammonia concentration sensor 130. The difference detector 132 outputs information on the detected difference to the control device 30.

[0059] Next, a description will be given of the processing of the combustion control device 29 by the control device 30 using the detection result of the difference detector 132. Fig. 11 is a flowchart showing an example of the processing of the combustion control device.

[0060] In the combustion control device 29, the differential detector 132 acquires the calculated value of the ammonia concentration from the ammonia concentration calculation device 40 (step S60). In the combustion control device 29, the differential detector 132 acquires the measured value of the ammonia concentration from the ammonia concentration sensor 130 (step S62). In the combustion control device 29, the differential detector 132 calculates the difference between the measured value and the calculated value (step S64). The combustion control device 29 controls the operating conditions based on the difference detected by the control device 30 using the differential detector 172 (step S66). For example, if the difference between the measured value and the measured value is equal to or greater than a certain level, the combustion control device 29 determines that the upstream equipment has deteriorated and executes processing.

[0061] The combustion control device 29 executes processing using the ammonia concentration measurement results at the same position as the calculated ammonia concentration, thereby determining deterioration of the engine 12, fuel, ammonia, and air supply systems. If the difference is equal to or greater than a certain level, the fuel control device 29 may issue an alarm indicating the need for replacement, may suggest operation, or may operate on fuel alone.

[0062] [Fourth embodiment] 12 is a block diagram showing an example of a combustion system according to the fourth embodiment. Note that members having the same functions as those in the first embodiment described above are given the same reference numerals, and detailed description thereof will be omitted.

[0063] A combustion system 10c shown in FIG. 12 includes an engine 12, an ammonia supply device 14, an air supply device 18, an exhaust pipe 20, an SCR (Selective Catalytic Reduction) catalyst 22, an ASC (ammonia slip catalyst) 24, and a combustion control device 29a. The combustion control device 29c includes a control device 30 and an ammonia concentration calculation device 40.

[0064] The combustion system 10c supplies ammonia and air to the engine 12 for combustion. In other words, the combustion system 10c is an ammonia-only combustion system. The engine 12 performs ignition using a spark plug or the like.

[0065] Even in a system such as combustion system 10c in which only ammonia is supplied as fuel to engine 12 and only ammonia is burned, the ammonia concentration at a specific position can be calculated by ammonia concentration calculation device 40 based on operating data of engine parameters, as in the first embodiment. Furthermore, combustion system 10c may be provided with a treated gas temperature calculation device 120 and a temperature sensor 122 like combustion system 10a, and control may be performed based on the pre-catalyst temperature. Furthermore, combustion system 10c may be provided with an ammonia concentration sensor 130 and a difference detector 132 like combustion system 10b, and control may be performed based on the calculated and measured values ​​of the ammonia concentration.

[0066] [Effects of this embodiment] (1) A concentration calculation device for calculating an ammonia concentration in exhaust gas emitted from an engine that burns ammonia, the concentration calculation device including: a data acquisition unit that acquires operating data of a plurality of operating parameters other than the unburned ammonia concentration of the engine; a memory unit that stores a calculation rule that takes the operating data of the engine as input and outputs the ammonia concentration at the specific position, the calculation rule being calculated based on the relationship between the operating data of the operating parameters and the ammonia concentration at a specific position in the exhaust gas; and a calculation unit that processes the operating data acquired by the data acquisition unit using the calculation rule stored in the memory unit to calculate the ammonia concentration of the exhaust gas at the specific position.

[0067] The concentration calculation device can calculate the ammonia concentration based on the operating data.

[0068] (2) The concentration calculation device according to (1), wherein the calculation rule is a trained program calculated by machine learning.

[0069] (3) The concentration calculation device according to (1) or (2), wherein the plurality of operating parameters are one parameter selected from operating parameters that are highly correlated with each other, and are a combination of parameters whose correlation with the unburned ammonia concentration is equal to or greater than a threshold value and whose correlation with each other is equal to or less than another threshold value.

[0070] (4) A concentration calculation device according to any one of (1) to (3), wherein the operating parameters are a value related to the combustion material input into the engine, a value related to the air input into the engine, a value related to the combustion pressure of the engine, and a value of the pressure or temperature of the gas flowing through the engine.

[0071] (5) The concentration calculation device according to any one of (1) to (4), wherein the specific position is downstream of the engine and upstream of a treatment device that treats ammonia in the exhaust gas.

[0072] (6) The concentration calculation device according to any one of (1) to (5), wherein the engine burns a mixture of ammonia and a fuel different from ammonia.

[0073] (7) The concentration calculation device according to any one of (1) to (5), wherein the engine is supplied with only ammonia as fuel.

[0074] (8) A concentration calculation device according to any one of (1) to (7), a control device that controls combustion in the engine, The control device is a combustion control device that controls the operation of the engine based on the ammonia concentration calculated by the concentration calculation device.

[0075] (9) a temperature sensor that measures the temperature of the engine exhaust gas upstream of the exhaust gas treatment device; The combustion control device according to (8), further comprising a post-treatment exhaust gas temperature calculation device that calculates the temperature of the exhaust gas downstream of the exhaust gas treatment device based on the measurement result of the temperature sensor and the calculation result of the concentration calculation device.

[0076] (10) an ammonia concentration sensor that measures the ammonia concentration of the exhaust gas from the engine upstream of the exhaust gas treatment device; The combustion control device according to (8) or (9), further comprising a difference detector that detects a difference between a measured value and a calculated value based on the measurement result of the ammonia concentration sensor and the calculation result of the concentration calculation device.

[0077] (11) A concentration calculation method for calculating an ammonia concentration in exhaust gas emitted from an engine that burns ammonia, comprising: a step of acquiring a calculation rule that takes engine operation data as input and outputs the ammonia concentration at a specific position, the calculation rule being calculated based on the relationship between operation data of the operation parameters and the ammonia concentration at a specific position in the exhaust gas; acquiring operating data of a plurality of operating parameters other than the unburned ammonia concentration of the engine; A concentration calculation method including a step of processing the acquired operating data using the calculation rule stored in the storage unit to calculate the ammonia concentration of the exhaust gas at a specific position.

[0078] (12) A concentration calculation program for calculating an ammonia concentration in exhaust gas emitted from an engine that burns ammonia, a step of acquiring a calculation rule that takes engine operation data as input and outputs the ammonia concentration at a specific position, the calculation rule being calculated based on the relationship between operation data of the operation parameters and the ammonia concentration at a specific position in the exhaust gas; acquiring operating data of a plurality of operating parameters other than the unburned ammonia concentration of the engine; a concentration calculation program that causes a computer to execute processing including a step of processing the acquired operating data using the calculation rule stored in the storage unit to calculate the ammonia concentration of the exhaust gas at a specific position. [Explanation of symbols]

[0079] 10, 10a, 10b, 10c Combustion System 12 Engine 14 Ammonia supply device 16 Fuel supply system 18 Air supply device 20 Exhaust piping 22 SCR catalyst 24 ASC 29, 29a, 29b, 29c Combustion control device 30 Control device 40 Ammonia concentration calculation device 42 Operation data acquisition unit 44 Memory section 46 Memory section 48 Learned Programs 70 Calculation program creation device 72 Operation data acquisition unit 74 Ammonia concentration acquisition unit 76 Arithmetic section 78 Memory section 80 Machine Learning Department 82 Data Creation Department 90 Study Programs 92 training data 100 Programming System 102, 104 Ammonia concentration sensor 106 Temperature Sensor 120 Post-treatment gas temperature calculation device 122 Temperature Sensor 130 Ammonia concentration sensor 132 Differential Detector

Claims

1. A concentration calculation device for calculating an ammonia concentration in exhaust gas emitted from an engine that burns ammonia, a data acquisition unit that acquires operating data of a plurality of operating parameters other than the unburned ammonia concentration of the engine; a storage unit that stores a calculation rule that takes engine operation data as an input and outputs an ammonia concentration at a specific position, the calculation rule being calculated based on the relationship between operation data of operation parameters and an ammonia concentration at a specific position in exhaust gas; a calculation unit that processes the operating data acquired by the data acquisition unit using a calculation rule stored in the storage unit to calculate the ammonia concentration of the exhaust gas at a specific position.

2. The concentration calculation device according to claim 1 , wherein the calculation rule is a trained program calculated by machine learning.

3. 2. The concentration calculation device according to claim 1, wherein the plurality of operating parameters is one parameter selected from operating parameters that are highly correlated with each other, and is a combination of parameters whose correlation with the unburned ammonia concentration is equal to or greater than a threshold and whose correlation with each other is equal to or less than another threshold.

4. 2. The concentration calculation device according to claim 1, wherein the operating parameters are a value related to an amount of ammonia introduced into the engine, a value related to air introduced into the engine, a value related to a combustion pressure of the engine, and a value of a pressure or a temperature of gas flowing through the engine.

5. 2. The concentration calculation device according to claim 1, wherein the specific position is downstream of the engine and upstream of a treatment device that treats ammonia in the exhaust gas.

6. 2. The concentration calculation device according to claim 1, wherein the engine burns a mixture of ammonia and a fuel different from ammonia.

7. 2. The concentration calculation device according to claim 1, wherein the engine is supplied with only ammonia as fuel.

8. The concentration calculation device according to any one of claims 1 to 7, a control device that controls combustion in the engine, The control device is a combustion control device that controls the operation of the engine based on the ammonia concentration calculated by the concentration calculation device.

9. a temperature sensor that measures the temperature of the exhaust gas from the engine upstream of the exhaust gas treatment device; 9. The combustion control device according to claim 8, further comprising a post-treatment exhaust gas temperature calculation device that calculates the temperature of the exhaust gas downstream of the exhaust gas treatment device based on the measurement result of the temperature sensor and the calculation result of the concentration calculation device.

10. an ammonia concentration sensor that measures the ammonia concentration of the exhaust gas of the engine upstream of the exhaust gas treatment device; 9. The combustion control device according to claim 8, further comprising a difference detector that detects a difference between a measured value and a calculated value based on the measurement result of the ammonia concentration sensor and the calculation result of the concentration calculation device.

11. A concentration calculation method for calculating an ammonia concentration in exhaust gas emitted from an engine that burns ammonia, comprising: a step of acquiring a calculation rule that takes engine operation data as input and outputs the ammonia concentration at a specific position, the calculation rule being calculated based on the relationship between operation data of the operation parameters and the ammonia concentration at a specific position in the exhaust gas; acquiring operating data of a plurality of operating parameters other than the unburned ammonia concentration of the engine; A concentration calculation method including a step of processing the acquired operating data using the calculation rule stored in the storage unit to calculate the ammonia concentration of the exhaust gas at a specific position.

12. A concentration calculation program for calculating an ammonia concentration in exhaust gas emitted from an engine that burns ammonia, a step of acquiring a calculation rule that takes engine operation data as input and outputs the ammonia concentration at a specific position, the calculation rule being calculated based on the relationship between operation data of the operation parameters and the ammonia concentration at a specific position in the exhaust gas; acquiring operating data of a plurality of operating parameters other than the unburned ammonia concentration of the engine; a concentration calculation program that causes a computer to execute processing including a step of processing the acquired operating data using the calculation rule stored in the storage unit to calculate the ammonia concentration of the exhaust gas at a specific position.

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