Processing device

Abstract

To provide a treatment device which can reduce an inflammation risk of a blowby gas of a hydrogen engine.SOLUTION: A treatment device 1 comprises: a catalyst part 21 arranged at an exhaust flow passage 20, and reducing a nitrogen oxide included in an exhaust gas with hydrogen as a reductant; a scavenging flow passage 30 for making a blowby gas G1 circulate; a scavenging pump 31 arranged at the scavenging flow passage 30, scavenging the blowby gas G1 from an engine 100, and making it circulate to the scavenging flow passage 30; a hydrogen separation filter 32 arranged at a downstream side of the scavenging pump 31, and creating a hydrogen gas G2 and a treated gas G3 from the blowby gas G1 by separating hydrogen contained in the blowby gas G1; and a hydrogen gas addition part 45 for adding the hydrogen gas G2 to the catalyst part 21.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a processing device.

Background Art

[0002] Patent Document 1 describes an engine capable of operating on a fuel containing hydrogen gas. In this engine, a ventilation port is formed in the crankcase, and a ventilation flow path is provided in the ventilation port. A ventilation fan is provided in the ventilation flow path, and thereby, the gas inside the crankcase is forcibly discharged to the outside.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the engine described in Patent Document 1, when there is a risk of hydrogen gas igniting inside the crankcase, the ventilation fan is driven to ventilate the inside of the crankcase, thereby suppressing the ignition of hydrogen gas inside the crankcase.

[0005] By the way, when the blow-by gas containing hydrogen is simply refluxed to the intake of the engine, the risk of ignition in the intake increases. Also, when the blow-by gas containing hydrogen is released to the atmosphere, the blow-by gas may remain in a part of the structure (for example, a vehicle) on which the engine is mounted, and there is a risk that the risk of ignition may increase as well. Patent Document 1 does not consider the treatment of blow-by gas for reducing such a risk of ignition.

[0006] Therefore, an object of the present disclosure is to provide a processing device capable of reducing the risk of ignition of blow-by gas in a hydrogen engine.

Means for Solving the Problem

[0007] The processing device according to the present disclosure is a processing device for processing blow-by gas of a hydrogen engine, which is provided in an exhaust gas flow path for flowing exhaust gas from the hydrogen engine, and reduces nitrogen oxides contained in the exhaust gas using hydrogen as a reducing agent. A catalyst section, a scavenging flow path for flowing blow-by gas of the hydrogen engine, a scavenging pump provided in the scavenging flow path for scavenging blow-by gas from the hydrogen engine and flowing it into the scavenging flow path, and provided on the downstream side of the scavenging pump in the scavenging flow path. A hydrogen separation filter for separating hydrogen contained in the blow-by gas to generate hydrogen gas and processed gas, which is the blow-by gas after hydrogen removal, and a hydrogen gas addition section for adding the hydrogen gas generated in the hydrogen separation filter to the catalyst section.

[0008] In this processing device, a pump is provided in the scavenging flow path for flowing blow-by gas from the hydrogen engine. Therefore, by driving this pump, it is possible to actively scavenge blow-by gas containing hydrogen from the hydrogen engine. In particular, in this processing device, a hydrogen separation filter for separating hydrogen from the blow-by gas to generate hydrogen gas and processed gas is provided on the downstream side of the pump in the scavenging flow path. The hydrogen gas among the gases generated from the blow-by gas is added to the catalyst section, used for reducing nitrogen oxides, and consumed. Therefore, among the gases generated from the blow-by gas, the gas that is refluxed to the intake of the hydrogen engine or released to the atmosphere becomes processed gas with a relatively low hydrogen concentration. Therefore, the ignition risk is reduced. In addition, since the hydrogen gas generated from the blow-by gas is added to the catalyst section and reused, it is possible to reduce the amount of hydrogen separately added to the catalyst section.

[0009] In the processing device according to the present disclosure, the scavenging flow path may include a reflux portion for refluxing the processed gas generated in the hydrogen separation filter to the intake flow path of the hydrogen engine. In this case, it becomes possible to return the processed gas among the blow-by gas to the intake side of the hydrogen engine.

[0010] The processing device according to the present disclosure includes a first measurement unit for measuring the hydrogen concentration of the blow-by gas in the hydrogen engine, a second measurement unit for measuring the hydrogen concentration of the processed gas, and a control unit for controlling each unit based on the measurement results of the first measurement unit and the second measurement unit. The control unit, based on the measurement result of the first measurement unit, when the hydrogen concentration of the blow-by gas in the hydrogen engine is equal to or higher than a first threshold value lower than the lower flammable limit concentration of hydrogen, performs a first process of increasing the scavenging amount of the blow-by gas by the scavenging pump, and based on the measurement result of the second measurement unit, when the hydrogen concentration of the processed gas is equal to or higher than a second threshold value lower than the lower flammable limit concentration of hydrogen, may execute a second process of increasing the separation amount of hydrogen from the blow-by gas by the hydrogen separation filter. In this case, it is possible to more reliably reduce the ignition risk of the blow-by gas. Note that the first threshold value and the second threshold value may be the same value as each other, or may be different values such that the second threshold value is lower (or higher) than the first threshold value. Further, the hydrogen concentration of the blow-by gas in the hydrogen engine means the hydrogen concentration inside the location where the blow-by gas in the hydrogen engine can be mixed (for example, inside the crankcase).

Advantages of the Invention

[0011] According to the present disclosure, it is possible to provide a processing device capable of reducing the ignition risk of the blow-by gas of a hydrogen engine.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0013] Hereinafter, an embodiment will be described with reference to the drawings. In each figure, the same or corresponding elements are denoted by the same reference numerals, and redundant descriptions are omitted.

[0014] FIG. 1 is a schematic diagram showing a processing device according to an embodiment. The processing device 1 shown in FIG. 1 is mounted on a large vehicle such as a bus or a truck, or an industrial vehicle, and is for processing exhaust gas G0 and blow-by gas G1 generated in the engine 100. The engine 100 is an internal combustion engine (hydrogen engine) driven by a fuel containing hydrogen. The vehicle on which the processing device 1 is mounted may be, for example, a so-called series hybrid vehicle that uses the engine 100 as a power source for power generation. In that case, the engine 100 may be configured to be driven when the remaining capacity of the battery decreases.

[0015] The engine 100 is, for example, a reciprocating engine, and includes a crankcase that houses a crankshaft and the like, a cylinder that houses a piston that drives the crankshaft, and a cylinder head and the like. A combustion chamber in which a fuel containing hydrogen is burned is formed in the cylinder, and blow-by gas G1 containing hydrogen leaked from the combustion chamber is retained in the crankcase, the cylinder head, and the like. The engine 100 is connected to an intake passage 10 for allowing air to flow into the combustion chamber and an exhaust passage 20 for allowing exhaust gas G0 to flow out of the combustion chamber.

[0016] The processing device 1 has a catalyst section 21 and a post-treatment section 22 provided in the exhaust gas passage 20. The catalyst section 21 is an H2-SCR (Selective Catalytic Reduction) device for selectively reducing nitrogen oxides contained in the exhaust gas G0 using hydrogen as a reducing agent. The post-treatment section 22 is provided downstream of the catalyst section 21 and may include, for example, another catalyst section (such as a urea SCR device) that selectively reduces nitrogen oxides contained in the exhaust gas G0 using ammonia or the like as a reducing agent, a filter for collecting particulate matter (PM: Particulate Matter) contained in the exhaust gas G0, or any element such as a device that oxidizes and purifies hydrocarbons (HC) and carbon monoxide (CO) contained in the exhaust gas G0.

[0017] The processing device 1 has a scavenging passage 30 for allowing the blow-by gas G1 of the engine 100 to flow therethrough. The processing device 1 also has a scavenging pump 31, a hydrogen separation filter 32, a filter 33, a tank 34, a booster pump 35, and a hydrogen concentration meter 36 provided in the scavenging passage 30. The scavenging passage 30 is connected to an arbitrary portion (such as a crankcase or a cylinder head) where the blow-by gas G1 of the engine 100 should be scavenged. The scavenging pump 31 is for scavenging the blow-by gas G1 from the engine 100 and allowing it to flow through the scavenging passage 30.

[0018] The hydrogen separation filter 32 is provided downstream of the scavenging pump 31 in the scavenging passage 30. The hydrogen separation filter 32 separates hydrogen contained in the blow-by gas G1 to generate hydrogen gas G2 and treated gas G3, which is the blow-by gas after hydrogen removal, from the blow-by gas G1. More specifically, the hydrogen separation filter 32 separates the blow-by gas G1 into high-purity hydrogen gas (hydrogen gas G2) and other than hydrogen gas (treated gas G3) using, for example, palladium. As an example, in the hydrogen separation filter 32, a method of extracting high-purity hydrogen by a hydrogen permeation mechanism using a palladium membrane is assumed.

[0019] Filter 33 is provided upstream of the scavenging pump 31 in the scavenging passage 30. The filter 33 removes oil and condensed water contained in the blow-by gas G1. Tank 34 is provided between the scavenging pump 31 and the hydrogen separation filter 32 in the scavenging passage 30. Tank 34 can store the blow-by gas G1 led out from the engine 100 to the scavenging passage 30 by driving the scavenging pump 31.

[0020] The boost pump 35 is provided between the tank 34 and the hydrogen separation filter 32 in the scavenging passage 30. The boost pump 35 applies pressure to the blow-by gas G1 so that the pressure (intake pressure) at which the blow-by gas G1 (treated gas G3) is returned to the intake passage 10 as described later, and the injection pressure of hydrogen gas to the catalyst unit 21 as described later are exceeded. The hydrogen concentration meter 36 is provided in the tank 34 and measures the hydrogen concentration of the blow-by gas G1 in the tank 34 (that is, upstream of the hydrogen separation filter 32).

[0021] The scavenging passage 30 is connected to the intake passage 10 on the downstream side of the hydrogen separation filter 32. Therefore, in the processing device 1, it is possible to reflux the treated gas G3 generated from the blow-by gas G1 by the hydrogen separation filter 32 to the intake passage 10. In other words, the scavenging passage 30 includes a reflux portion 30p for refluxing the treated gas G3 to the intake passage 10 as a portion downstream of the hydrogen separation filter 32. And the processing device 1 includes a hydrogen concentration meter (second measurement unit) 37 provided in the reflux portion 30p. The hydrogen concentration meter 37 measures the hydrogen concentration of the treated gas G3.

[0022] On the one hand, the processing device 1 includes a hydrogen gas flow path 40 connected to the scavenging flow path 30 via a hydrogen separation filter 32, and a hydrogen supply path 50 for supplying (adding) hydrogen to the catalyst unit 21. The hydrogen gas flow path 40 is connected to the hydrogen separation filter 32 at one end and to the hydrogen supply path 50 at the other end. Thereby, in the processing device 1, it is possible to introduce the hydrogen gas G2 generated from the blow-by gas G1 by the hydrogen separation filter 32 into the hydrogen supply path 50 through the hydrogen gas flow path 40.

[0023] The hydrogen supply path 50 is connected to a hydrogen supply unit 51 at one end and to the upstream stage of the catalyst unit 21 in the exhaust flow path 20 at the other end. Thereby, in the processing device 1, the hydrogen supplied from the hydrogen supply unit 51 and the hydrogen gas G2 introduced from the hydrogen separation filter 32 through the hydrogen gas flow path 40 can be supplied (added) to the catalyst unit 21 through the hydrogen supply path 50. That is, the hydrogen gas flow path 40 and the hydrogen supply path 50 constitute a hydrogen gas addition unit 45 for supplying the hydrogen gas G2 generated in the hydrogen separation filter 32 to the catalyst unit 21 and adding hydrogen to the catalyst unit 21.

[0024] The processing device 1 includes a hydrogen concentration meter 41 provided in the hydrogen gas flow path 40. The hydrogen concentration meter 41 measures the hydrogen concentration of the hydrogen gas G2. Further, the processing device 1 includes a hydrogen concentration meter (first measurement unit) 101 provided in the engine 100. The hydrogen concentration meter 101 measures the hydrogen concentration of the blow-by gas G1 in the engine 100. The hydrogen concentration meter 101 measures the hydrogen concentration of the blow-by gas G1 inside the engine 100, such as in the crankcase and the cylinder head, for example.

[0025] The hydrogen concentration meter 101 can be provided in at least one of the crankcase and the cylinder head to measure the hydrogen concentration of the blow-by gas G1 in the one part. Further, the hydrogen concentration meter 101 may be provided in another part of the engine 100 to measure the hydrogen concentration of the blow-by gas G1 in the other part.

[0026] The above hydrogen concentration meters 36, 37, 41, and 101 can be partially omitted by being configured to infer (calculate) some of the measurement results based on some of the measurement results. For example, based on the measurement result of the hydrogen concentration of the blow-by gas G1 in the engine 100 by the hydrogen concentration meter 101 and the measurement result of the hydrogen concentration of the processed gas G3 by the hydrogen concentration meter 37, by calculating and estimating the hydrogen concentration of the hydrogen gas G2, the hydrogen concentration meter 41 for measuring the hydrogen concentration of the hydrogen gas G2 can be omitted.

[0027] Here, the processing device 1 includes a control unit 60. The control unit 60 acquires information indicating the measurement results of the hydrogen concentration from the hydrogen concentration meters 36, 37, 41, and 101, and controls each part of the processing device 1 based on the information. Physically, the control unit 60 can be configured as a computer system including a CPU (Central Processing Unit), a RAM (Random Access Memory) which is a main storage device, a ROM (Read Only Memory), a communication module which is a data transmission and reception device, and the like. Each process of the control unit 60 can be realized by loading a predetermined program onto the above hardware and operating the communication module and reading and writing data in the RAM and the like under the control of the CPU.

[0028] Subsequently, the operation of the processing device 1 (the processing of the control unit 60) will be described. FIG. 2 is a flowchart showing the operation of the processing device shown in FIG. 1. As shown in FIG. 2, in the processing device 1, first, the hydrogen concentration of the blow-by gas G1 in the engine 100 is measured (step S101). The hydrogen concentration of the blow-by gas G1 in the engine 100 means the hydrogen concentration at a location where the blow-by gas G1 in the engine 100 can be mixed in. As an example, it is the hydrogen concentration in the crankcase of the engine 100. According to this example, in step S101, the hydrogen concentration meter 101 measures the hydrogen concentration in the crankcase of the engine 100 and provides information indicating the measurement result to the control unit 60.

[0029] Subsequently, the control unit 60 determines whether the hydrogen concentration of the blow-by gas G1 in the engine 100 measured in step S101 is equal to or higher than a first threshold value (step S102). The first threshold value is lower than the lower flammable limit concentration of hydrogen in air (for example, 4%), and can be set to about 2%, for example.

[0030] If the result of the determination in step S102 indicates that the hydrogen concentration of the blow-by gas G1 in the engine 100 is less than the first threshold value (step S102: No), the operation of the processing device 1 returns to step S101, and the subsequent steps are carried out again.

[0031] On the other hand, if the result of the determination in step S102 indicates that the hydrogen concentration of the blow-by gas G1 in the engine 100 is equal to or higher than the first threshold value (step S102: Yes), the control unit 60 adjusts to increase the scavenging amount of the blow-by gas G1 by the scavenging pump 31, and activates the scavenging of the measurement location of the hydrogen concentration in the engine 100 (step S103).

[0032] That is, in step S103, when the hydrogen concentration of the blow-by gas G1 in the engine 100 is equal to or higher than the first threshold value, which is lower than the lower flammable limit concentration of hydrogen, based on the measurement result of the hydrogen concentration meter 101, the control unit 60 executes a first process of increasing the scavenging amount of the blow-by gas G1 by the scavenging pump 31. The blow-by gas G1 scavenged by the scavenging pump 31 is refluxed to the intake passage 10 (as the processed gas G3) via the scavenging passage 30 and the hydrogen separation filter 32. At that time, the blow-by gas G1 can be at least temporarily and partially stored in the tank 34.

[0033] Subsequently, in the processing device 1, the hydrogen concentration of the processed gas G3 refluxed to the intake passage 10 is measured (step S104). This is to ensure that the hydrogen concentration in the intake passage 10 is outside the flammable range of hydrogen. In this step S104, as an example, the hydrogen concentration meter 37 measures the hydrogen concentration of the processed gas G3 at the reflux portion 30p of the scavenging passage 30, and provides information indicating the measurement result to the control unit 60.

[0034] Subsequently, the control unit 60 determines whether the hydrogen concentration of the processed gas G3 measured in step S104 is equal to or higher than a second threshold value (step S105). The second threshold value is lower than the lower flammable limit concentration of hydrogen in air (e.g., 4%), and can be set to about 2%, for example. Note that the first threshold value and the second threshold value may be the same value as each other, or may be different values from each other, such as the second threshold value being lower (or higher) than the first threshold value.

[0035] If the result of the determination in step S105 indicates that the hydrogen concentration of the processed gas G3 is less than the second threshold value (step S105: No), the operation of the processing apparatus 1 returns to step S104, and the subsequent steps are performed again.

[0036] On the other hand, if the result of the determination in step S105 indicates that the hydrogen concentration of the processed gas G3 is equal to or higher than the second threshold value (step S105: Yes), the control unit 60 adjusts to increase the hydrogen separation amount in the hydrogen separation filter 32 (step S106). That is, in step S106, when the hydrogen concentration of the processed gas G3 is equal to or higher than the second threshold value, which is lower than the lower flammable limit concentration of hydrogen, based on the measurement result of the hydrogen concentration meter 37, the control unit 60 executes a second process of increasing the separation amount of hydrogen from the blow-by gas G1 by the hydrogen separation filter 32.

[0037] As an example of a method for adjusting the hydrogen separation amount in the hydrogen separation filter 32, the following method can be mentioned. That is, for example, when the hydrogen separation filter 32 uses the palladium film as described above, the hydrogen permeation rate J (NL / min·cm 2 ) is represented by α(P in 1 / 2 -P out 1 / 2 ) (α is the hydrogen permeation rate, P in is the hydrogen partial pressure on the raw material gas side, and P out is the hydrogen partial pressure on the permeated gas side). Therefore, the control unit 60 controls the booster pump 35 on the inlet side of the hydrogen separation filter 32 to control P inBy controlling [it], the hydrogen permeation amount J (i.e., the hydrogen separation amount) can be adjusted. At this time, the flow rate of the blow-by gas G1 due to the scavenging of the scavenging pump 31 and the desired P in There may be a case where they are different from the flow rate of the blow-by gas G1 to be introduced into the hydrogen separation filter 32 in order to achieve in . Therefore, in order to make it possible to adjust the flow rate of the blow-by gas G1 to the hydrogen separation filter 32 (for on-demand use), the tank 34 is used.

[0038] Thereafter, the processing device 1 adds the hydrogen separated by the hydrogen separation filter 32 to the catalyst part 21 (step S107). That is, in the processing device 1, the hydrogen gas G2 generated in the hydrogen separation filter 32 is supplied to the catalyst part 21 via the hydrogen gas flow path 40 and the hydrogen supply path 50 (hydrogen gas addition part 45). Note that the supply of the hydrogen gas G2 to the catalyst part 21 via the hydrogen gas addition part 45 can be constantly performed while the hydrogen gas G2 is being generated by the hydrogen separation filter 32.

[0039] As described above, in the processing device 1, the scavenging pump 31 is provided in the scavenging flow path 30 through which the blow-by gas G1 from the engine 100 flows. Therefore, by driving this scavenging pump 31, it is possible to actively scavenge the blow-by gas G1 containing hydrogen from the engine 100. In particular, in the processing device 1, a hydrogen separation filter 32 that separates hydrogen from the blow-by gas G1 to generate a hydrogen gas G2 and a processed gas G3 is provided on the downstream side of the scavenging pump 31 in the scavenging flow path 30. Among the gases generated from the blow-by gas G1, the hydrogen gas G2 is added to the catalyst part 21 and used for the reduction of nitrogen oxides and consumed. Therefore, among the gases generated from the blow-by gas G1, the gas that is refluxed to the intake of the engine 100 or released to the atmosphere becomes the processed gas G3 with a relatively low hydrogen concentration. Therefore, the ignition risk is reduced. Further, since the hydrogen gas G2 generated from the blow-by gas G1 is added to the catalyst part 21 and reused, it becomes possible to reduce the amount of hydrogen separately added to the catalyst part 21.

[0040] Further, in the processing device 1, the scavenging passage 30 includes a reflux portion 30p for refluxing the processed gas G3 generated in the hydrogen separation filter 32 to the intake passage 10 of the engine 100. Therefore, it becomes possible to return the processed gas G3 in the blow-by gas G1 to the intake side of the engine 100.

[0041] Furthermore, the processing device 1 includes a hydrogen concentration meter 101 for measuring the hydrogen concentration of the blow-by gas G1 in the engine 100, a hydrogen concentration meter 37 for measuring the hydrogen concentration of the processed gas G3, and a control unit 60 for controlling each part based on the measurement results of the hydrogen concentration meters 101 and 37. When the hydrogen concentration of the blow-by gas G1 in the engine 100 is equal to or higher than a first threshold value lower than the lower flammable limit concentration of hydrogen based on the measurement result of the hydrogen concentration meter 101, the control unit 60 performs a first process of increasing the scavenging amount of the blow-by gas G1 by the scavenging pump 31, and when the hydrogen concentration of the processed gas G3 is equal to or higher than a second threshold value lower than the lower flammable limit concentration of hydrogen based on the measurement result of the hydrogen concentration meter 37, the control unit 60 performs a second process of increasing the separation amount of hydrogen from the blow-by gas G1 by the hydrogen separation filter 32. Therefore, the ignition risk of the blow-by gas G1 can be more reliably reduced.

[0042] The above embodiments illustrate one aspect of the present disclosure. Therefore, the present disclosure is not limited to the above embodiments and may be a modification of the above embodiments.

[0043] For example, in the above embodiment, the control unit 60 performs the first process and the second process of controlling the scavenging pump 31 and the hydrogen separation filter 32 based on the measurement result of the hydrogen concentration of the blow-by gas G1 in the engine 100 by the hydrogen concentration meter 101 and the measurement result of the hydrogen concentration of the processed gas G3 by the hydrogen concentration meter 37. However, the control unit 60 may perform the first process and the second process by calculating and estimating the hydrogen concentration of the blow-by gas G1 and the hydrogen concentration of the processed gas G3 in the engine 100 from the measurement results of other hydrogen concentration meters.

[0044] Further, in the above embodiment, in the processing device 1, the supply of the hydrogen gas G2 to the catalyst unit 21 via the hydrogen gas addition unit 45 can be continuously performed while the hydrogen gas G2 is being generated by the hydrogen separation filter 32. In addition to this, in the processing device 1, the reflux of the processed gas G3 to the intake passage 10 via the reflux unit 30p can also be continuously performed while the processed gas is being generated by the hydrogen separation filter 32.

[0045] On the other hand, in the processing device 1, a valve or the like is provided in the reflux unit 30p, and the control unit 60 controls the opening and closing of the valve according to the hydrogen concentration of the processed gas G3. For example, when the hydrogen concentration of the processed gas G3 is equal to or higher than the second threshold value, it is also possible to perform a process such that the processed gas G3 is not refluxed to the intake passage 10.

Explanation of Reference Numerals

[0046] 1... Processing device, 10... Intake passage, 20... Exhaust passage, 21... Catalyst unit, 30... Scavenging passage, 30p... Reflux unit, 31... Scavenging pump, 32... Hydrogen separation filter, 45... Hydrogen gas addition unit, 60... Control unit, 100... Engine (hydrogen engine), G0... Exhaust gas, G1... Blow-by gas, G2... Hydrogen gas, G3... Processed gas.

Claims

1. A processing device for processing blow-by gas of a hydrogen engine, comprising: a catalyst section provided in an exhaust gas flow path for flowing exhaust gas from the hydrogen engine, for reducing nitrogen oxides contained in the exhaust gas using hydrogen as a reducing agent; a scavenging flow path for flowing the blow-by gas of the hydrogen engine; a scavenging pump provided in the scavenging flow path for scavenging the blow-by gas from the hydrogen engine and flowing it through the scavenging flow path; a hydrogen separation filter provided downstream of the scavenging pump in the scavenging flow path, for generating hydrogen gas and processed gas which is the blow-by gas after hydrogen removal from the blow-by gas by separating hydrogen contained in the blow-by gas; a hydrogen gas addition section for adding the hydrogen gas generated in the hydrogen separation filter to the catalyst section; and a processing device comprising the above.

2. The scavenging flow path includes a reflux section for refluxing the processed gas generated in the hydrogen separation filter to an intake flow path of the hydrogen engine, The processing device according to Claim 1.

3. a first measurement section for measuring the hydrogen concentration of the blow-by gas in the hydrogen engine; a second measurement section for measuring the hydrogen concentration of the processed gas; a control section for controlling each part based on the measurement results of the first measurement section and the second measurement section; and comprising: The control section: Based on the measurement result of the first measurement section, when the hydrogen concentration of the blow-by gas in the hydrogen engine is equal to or higher than a first threshold lower than the lower flammable limit concentration of hydrogen, a first process of increasing the scavenging amount of the blow-by gas by the scavenging pump; Based on the measurement result of the second measurement section, when the hydrogen concentration of the processed gas is equal to or higher than a second threshold lower than the lower flammable limit concentration of hydrogen, a second process of increasing the separation amount of hydrogen from the blow-by gas by the hydrogen separation filter; and executes the above. The processing device according to Claim 1 or 2.

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