JP2012168132A - Engine system with apparatus for measuring gas component in waste gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine system including an apparatus for measuring a gas component in a waste gas.SOLUTION: An engine system 200A including an apparatus for measuring a gas component in a waste gas includes a diesel engine 100, an exhaust pipe 202 which exhausts a waste gas 201 from the diesel engine 100, and a gas component measuring apparatus 10A (10B) which measures the concentration of particular material (particular material (PM) or the like) of the waste gas 201 in the exhaust pipe 202. During the operation of the diesel engine, the waste gas nature is measured, thereby accurately controlling e.g., fuel jet pressure and jet timing.

Description

  The present invention relates to an engine system including a gas component measurement device in exhaust gas that can measure the exhaust gas properties from, for example, a diesel engine or a gas engine online.

  Conventionally, it is known to measure the concentration of dust (particulate matter) component in fuel gas by Mie scattered light by laser irradiation (see Patent Documents 1 and 2).

JP 2005-24249 A JP 2005-24250 A

By the way, in order to obtain the particulate matter concentration with a conventional laser device, an original operation of measuring Mie scattered light is required, and a measuring device different from the laser Raman scattering analysis is required.
However, an independent apparatus configuration becomes large, and establishment of an analysis method capable of simultaneously performing a compact gas component analysis and a particulate matter concentration analysis is desired.
In particular, if a plurality of analyzes (gas composition, particulate matter concentration, hydrocarbon concentration) can be realized by using only a single detection means, the number of parts in the device can be reduced, and a compact analyzer can be achieved. It can be provided. That is, when a plurality of analyzers are used, there is a problem that maintenance of each device is required, and costs and labor are required.

  In particular, when trouble occurs due to carbon-derived particulate matter (PM (Particulate Matter)) in exhaust gas derived from incomplete combustion of a diesel engine of a ship being navigated, analysis during navigation However, it takes a long time for the analysis results to come out, and a lot of loss is incurred until the countermeasures are implemented. The emergence of simple and quick measuring devices is required.

  In particular, in recent years, crude fuel has been used to reduce the running cost of diesel engines, while exhaust gas regulations have become stricter year by year, not only suppressing emission of particulate matter, In particular, establishment of a simple analytical method for reducing polycyclic aromatic hydrocarbons (PAH) is desired.

  This invention makes it a subject to provide the engine system provided with the gas component measuring device in waste gas which can measure the particulate matter and hydrocarbon in gas in view of the said problem.

  A first invention of the present invention for solving the above-described problem includes an engine, an exhaust pipe that exhausts exhaust gas from the engine, and a laser device that irradiates the exhaust gas in the exhaust pipe with laser light. A first wavelength converter that converts the wavelength of the basic laser beam oscillated from the laser irradiation device into a first laser beam; and a wavelength converter that converts the wavelength of the basic laser beam into a second laser beam. A second wavelength conversion unit, a gas measurement unit that introduces the first and second laser beams to irradiate the gas component in the gas to be measured, and the first laser beam and the second laser beam to be irradiated Detection to measure amplified spontaneous emission (ASE) generated when an excited molecule excited to a high level by a laser beam is electronically relaxed to a low level. And in the gas to be measured In an engine system having a gas component measuring apparatus in the exhaust gas, characterized by comprising a fluorescence detector for measuring fluorescence hydrocarbon-derived oil occurs.

  According to a second invention, there is provided a gas component measuring device in exhaust gas, wherein the gas temperature of the gas to be measured is measured from the relative intensity of fluorescence emitted from the gas component of the gas to be measured in the first invention. In the engine system.

  3rd invention WHEREIN: Soot detection which measures the Mie scattered light which the soot which exists in to-be-measured gas emits using either 1st laser beam or 2nd laser beam in 1st or 2nd invention An engine system comprising a gas component measuring device in exhaust gas, characterized by comprising a section.

  According to the present invention, for example, by measuring the exhaust gas properties from a diesel engine, a gas engine or the like with a single device, it is possible to quickly grasp the engine operating status, and to keep the engine operating status favorable, Appropriate precautions can be taken.

FIG. 1 is an explanatory view schematically showing a diesel engine. FIG. 2 is an explanatory diagram schematically showing one cylinder. FIG. 3A is a schematic diagram of an engine system including a gas component measuring device in exhaust gas according to the present invention. FIG. 3-2 is a schematic diagram of an engine system including a gas component measuring device in exhaust gas according to the present invention. FIG. 3-3 is a schematic diagram of an engine system including a gas component measuring device in exhaust gas according to the present invention. FIG. 4 is a schematic diagram of the gas component measuring apparatus according to the first embodiment. FIG. 5 is a schematic diagram of the energy level of NO. FIG. 6 is a schematic diagram of the energy level of CO. FIG. 7 is a schematic diagram of a gas component measuring apparatus according to the second embodiment. FIG. 8 is a graph showing the relationship between the fluorescence intensity of NO gas and the rotational quantum number (J). Figure 9 is a LIF excitation spectrum intensity diagram of the energy of the pump light in the P ₁₂ branches in transition ^{"A 2 Σ + ← X2Π (0,0} ) " at a temperature of 300K and 1250K. FIG. 10 is a schematic diagram of a gas component measuring apparatus according to the third embodiment. FIG. 11 is a schematic diagram of another gas component measuring apparatus according to the third embodiment. FIG. 12 is a flowchart for measuring the property in the exhaust gas and implementing the countermeasure.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

FIG. 1 is an explanatory view schematically showing a diesel engine. FIG. 2 is an explanatory diagram schematically showing one cylinder.
As shown in FIG. 1, the diesel engine 100 of the present embodiment includes one or more (9 in this embodiment) cylinders 120, a supercharger 111, an air cooler 112, and an exhaust collecting pipe 113. Including. First, a basic configuration of one cylinder 120 will be described with reference to FIG. In the following, a reciprocating type is described as an example of the cylinder 120, but the cylinder 120 may be a rotary type. As shown in FIG. 2, the cylinder 120 includes a cylinder 121, a piston 122, a crankshaft 123, a crank chamber 123a, a connecting rod 124, a cylinder head 125, a combustion chamber 125a, an intake port 126a, and an intake air. A valve 126, an exhaust port 127a, an exhaust valve 127, an injector 128, and an oil pan 129 are included.

  The cylinder 121 is a cylindrical member. The piston 122 is provided in the hollow portion of the cylinder 121. The piston 122 is provided so as to be movable in the central axis direction of the cylinder 121. The crankshaft 123 is provided in the crank chamber 123a so that it can rotate. The crank chamber 123 a is provided on one side of the cylinder 121 in the central axis direction. The crankshaft 123 converts the reciprocating motion of the piston 122 into rotational motion. The connecting rod 124 connects the piston 122 and the crankshaft 123.

  The cylinder head 125 is provided on the other side of the cylinder 121 in the central axis direction (the side opposite to the crank chamber 123a). The combustion chamber 125 a is a space surrounded by the piston 122 and the cylinder head 125.

  The intake port 126a and the exhaust port 127a communicate the outside of the cylinder 120 and the combustion chamber 125a. The intake valve 126 is provided in the intake port 126a. The intake valve 126 adjusts the flow of air between the outside of the cylinder 120 and the combustion chamber 125a via the intake port 126a. The exhaust valve 127 is provided in the exhaust port 127a. The exhaust valve 127 adjusts the flow of air between the outside of the cylinder 120 and the combustion chamber 125a via the exhaust port 127a.

  The injector 128 is connected to the fuel injection pump 128a shown in FIG. The fuel injection pump 128 a pressurizes the emulsion fuel from the fuel supply device 130 and guides the emulsion fuel to the injector 128. The injector 128 is provided with, for example, a jet port protruding from the combustion chamber 125a. The injector 128 guides the emulsion fuel guided from the combustion injection pump 128a to the combustion chamber 125a. Emulsion fuel is a mixture of water and fuel such as light oil and heavy oil. The injector 128 may be provided with a jet port protruding from the intake port 126a. The oil pan 129 is provided in the crank chamber 123a. Oil pan 129 stores lubricating oil 131.

  The cylinder 120 configured as described above repeatedly performs one cycle of intake, compression, expansion, and exhaust. Thereby, in the cylinder 120, the piston 122 reciprocates and the crankshaft 123 rotates. The cylinder 120 may perform one cycle with four strokes, or may perform one cycle with two strokes.

Returning to the description of the diesel engine 100.
The supercharger 111 pressurizes air. The supercharger 111 is a so-called turbocharger that pressurizes air by obtaining energy of exhaust gas discharged from the exhaust port 127a shown in FIG. The supercharger 111 may be a so-called supercharger that obtains the rotational force of the crankshaft 123 and pressurizes the air. The air cooler 112 cools the air guided from the supercharger 111. The exhaust collecting pipe 113 communicates with the exhaust port 127a of each cylinder 120. In the present embodiment, the exhaust gas discharged from the exhaust port 127 a of each cylinder 120 is guided to the supercharger 111 through the exhaust collecting pipe 113.

  Here, the crankshaft 123 shown in FIG. 1 is a member common to each cylinder 120. With the above configuration, when each cylinder 120 is operated, the diesel engine 100 rotates the crankshaft 123. In the present embodiment, the diesel engine 100 has been described as including the supercharger 111, but the diesel engine 100 may not include the supercharger 111. That is, the diesel engine 100 may be a naturally aspirated internal combustion engine. In this case, the diesel engine 100 may not include the air cooler 112.

  Next, an engine system provided with a gas component measuring device in exhaust gas will be described in detail.

FIGS. 3-1 to 3-3 show schematic views of an engine system provided with a gas component measuring device in exhaust gas according to the present invention.
As shown in FIGS. 3-1 to 3-3, diesel engine systems 200 </ b> A to 200 </ b> C equipped with a gas component measuring device in exhaust gas are a diesel engine 100 and an exhaust pipe that discharges exhaust gas 201 from the diesel engine 100. 202 and a gas component measuring device 10A (10B) that measures the properties of the exhaust gas 201 in the exhaust pipe 202.

  First, the diesel engine 100 in the diesel engine system 200A shown in FIG. 3A includes a supercharger 111 for supercharging intake air. The supercharger 111 is interposed in an exhaust pipe 202. A turbine 111a, and a compressor 111b interposed in the intake pipe 203. Reference numeral 220 denotes a common rail fuel injection system (CRS) of an electromagnetic high pressure injection system, and 221 denotes a throttle valve.

  The diesel engine 100 in the diesel engine system 200B shown in FIG. 3-2 further includes an exhaust gas recirculation device (an exhaust gas recirculation device) that communicates an exhaust pipe 202 upstream of the turbine 111a and an intake pipe 203 downstream of the compressor 111b. (Hereinafter referred to as “EGR”). An EGR valve 211 is interposed in the EGR passage 210. The EGR rate is adjusted by controlling the opening degree of the EGR valve 211. Reference numeral 212 denotes an EGR cooler.

  The diesel engine system 200C shown in FIG. 3C further includes a diesel particulate filter (hereinafter referred to as “DPF”) 230 in the exhaust pipe 202. The exhaust gas 201 is exhausted outside by detour.

  FIG. 4 is a schematic diagram of a gas component measuring apparatus 10A according to the present embodiment. As shown in FIG. 4, the gas component measuring apparatus 10 </ b> A according to the present embodiment is higher than the basic laser light 22 irradiated to the gas 11 to be measured in the flue 15 (the solid line indicates the optical axis) 22. When an excited molecule excited to a level is electronically relaxed to a lower level, the gas component in the measured gas 11 is measured from amplified spontaneous emission (ASE) generated when the level is lowered. To do.

As a specific apparatus configuration, as shown in FIG. 4, the gas component measuring apparatus 10 </ b> A according to the present embodiment uses the basic laser light (1064 nm) 22 oscillated from the laser apparatus 21 as the first laser light (wavelength: 226 nm) a first wavelength conversion unit 23 that converts the wavelength to 22-1, and a second wavelength conversion that converts the wavelength of the oscillated basic laser light 22 into a second laser light (wavelength: 600 nm) 22-2. A gas measuring unit 25 that introduces the combined laser beam 22-3 of the first laser beam 22-1 and the second laser beam 22-2 and irradiates the gas component in the measured gas 11; The excited molecules excited to a high level (E level) by the irradiated combined laser beam 22-3 (the first laser beam 22-1 and the second laser beam 22-2) have a low level. When electronically relaxing to (C level), when that level falls A photodetector (for example, a photodiode, an MCT detector, etc.) 26 that measures the amplified spontaneous emission light (Amplified Spontaneous Emission: hereinafter referred to as “ASE”) 14 and a fluorescence 50 emitted from a component in the gas 11 to be measured are measured. And a fluorescence detection unit 51.
In FIG. 4, reference numerals 15a and 15b denote quartz windows through which laser light passes, 29 denotes a spectroscope, 31 denotes a condenser lens, 33 denotes an optical filter, and 34a to 34d denote mirrors.

  The gas component measuring apparatus according to the present invention uses the principle of ASE emission and is different from the conventional absorption analysis. Therefore, the gas absorption light intensity of the measurement gas 11 is not affected.

Next, the light emission principle of ASE will be described with reference to a schematic diagram of the energy level of NO shown in FIG.
When, for example, nitric oxide (NO) in the measurement gas is irradiated with laser light and excited electronically, as shown in FIG. 5, the ground state (X) is excited (X level → A level → E level).

Specifically, it is excited from the X level to the A level at the excitation wavelength of the first laser beam (226 nm) 22-1 and then from the A level at the excitation wavelength of the second laser beam (600 nm) 22-2. Excited to E level.
At this time, when the number of molecules at the E level is larger than the number of molecules at the C level, an inversion distribution state occurs, and spontaneous emission from the E level to the C level occurs. Spontaneous radiation amplified light (ASE) of 1170 to 1184 nm, which is stimulated emission of the level, is generated.

As gas components to be measured in the gas to be measured, in addition to nitrogen monoxide (NO), for example, carbon monoxide (CO), water (H ₂ O), nitrogen dioxide (NO ₂ ), methane (CH ₄ ), Ammonia, benzene and the like can be exemplified.

FIG. 6 is a schematic diagram of energy levels of carbon monoxide (CO).
As shown in FIG. 6, carbon monoxide (CO) is excited from the X level to the E level by two-light excitation of 215 nm from the ground state.

  At this time, when the number of molecules at the E level is larger than the number of molecules at the B level, an inversion distribution state occurs, and spontaneous emission from the E level to the B level occurs. A spontaneous emission amplified light (ASE) of 1.7 μm, which is stimulated emission of the B level, is generated.

  Moreover, since ASE has a wavelength in the infrared region (for example, 1170 to 1184 nm in the case of NO), unlike the visible region and the ultraviolet region, separation with the optical filter 33 is easy, and measurement accuracy is improved. .

Since luminescence analysis such as fluorescence and Raman is isotropic emission, light spreads in all directions and has no directivity, whereas ASE has directivity (ASE14 in only two directions of the incident direction and the outgoing direction of the basic laser beam 22). Can be separated with high sensitivity.
Therefore, in this embodiment, a light introduction line through which laser light is introduced into the gas measurement unit 25 and a light emission line in the same direction as the traveling direction of the laser light that emits the generated ASE 14 are provided.

As a result, the concentration analysis of the gas component can be performed online even when the pipe length of the measurement target in the industrial facility is long or the gas absorption amount is large.
In addition, since ASE oscillates as directional light, the ASE light emission component is easily condensed and the measurement sensitivity is high.
Furthermore, since ASE is light in the infrared region, separation from incident laser light (visible light, ultraviolet light) is facilitated, and detection with a high signal-to-noise ratio is possible.

In this embodiment, the fluorescence detection unit 51 measures the fluorescence 50 generated by the hydrocarbon (HC) derived from oil present in the gas.
Here, the detection of the hydrocarbon is provided with a spectroscope that excludes wavelengths other than the wavelength of 300 to 450 nm (more preferably 350 to 400 nm) in the fluorescence detection unit 51 to improve the detection of the hydrocarbon.
Thereby, the analysis of hydrocarbon (HC) present in the gas can be performed simultaneously with the measurement of the gas component by the measurement of ASE14.

  As a result, it is possible to perform multi-faceted analysis with a single measurement by simultaneously measuring hydrocarbon (HC) which is a component other than the gas component derived from the gas plant.

  As a result, when the amount of hydrocarbons contained in the exhaust gas is large, it is determined that there is a large amount of oil (particularly tar components) in the exhaust gas, and the control for reviewing the combustion conditions is performed by a control device (not shown). ing.

  By using such a gas component measuring apparatus 10A shown in FIG. 4 and measuring the properties in the exhaust gas from, for example, a diesel engine or a gas engine with a single device, it is possible to quickly grasp the engine operating status. And appropriate precautions can be taken to keep the engine operating conditions in good condition.

Next, the control of an example of the particulate matter concentration measurement by the control means and the emission suppression countermeasure will be described.
FIG. 12 is a flowchart for measuring the property in the exhaust gas and implementing the countermeasure.

  First, the control means acquires the concentration of exhaust gas components (HC, NO, CO, etc.) from the gas component measuring device 10A (step ST1).

  Next, it is determined whether or not the acquired concentration of the exhaust gas property exceeds a predetermined allowable value (threshold value) (step ST2).

  When it is determined that the measured concentration does not exceed the allowable value (step ST2: Yes), the present control is terminated and the measurement of the exhaust gas property is continued.

  On the other hand, when it is determined that the allowable value is exceeded (step ST2: No), adjustment of the fuel injection pressure and injection timing of the engine is instructed from the control device (step ST3).

In this way, during engine operation, the exhaust gas properties are measured by the gas component measuring device 10A to measure the component concentration, so that, for example, the injection pressure and injection timing of the electronically controlled fuel injection system can be appropriately controlled and always stable. Fuel can be done.
In ASE analysis, since there is no influence of fluorescence, when measuring the fluorescence with NO, if the concentration of HC is high, there is a concern about the influence. However, by analyzing NO by ASE, the influence is affected. Therefore, accurate measurement can be performed. That is, as shown in FIG. 5, in order to raise the energy level of NO, excitation with 226 nm ultraviolet light and then with 600 nm visible light generate spontaneously amplified amplified light (ASE) in the near infrared region. Therefore, there is no influence of fluorescence.
Furthermore, when there is a space limitation in the engine equipment and all the optical devices cannot be installed, the ASE photodetector 26 having directivity can be installed in a place away from the measurement location.

Next, in Example 2, another gas component measuring device of the present invention will be described with reference to the drawings.
FIG. 7 is a schematic diagram of a gas component measuring apparatus according to the second embodiment. As shown in FIG. 7, the gas component measuring apparatus 10 </ b> A according to the present embodiment measures the NO-derived fluorescence (NO) 50 </ b> A in the gas component in the fluorescence detection unit 51, and the temperature curve measured in advance. In light of the above, the temperature in the gas is measured.
Here, in order to detect the NO-derived fluorescence (NO) 50A, the fluorescence detector 51 has a filter (preferably a filter having a wavelength of 250 nm or less, for example, 227 nm) that transmits light having a wavelength of 300 nm or less. The detection of NO-derived fluorescence (NO) 50A is good.
Thereby, the temperature in the gas can be measured simultaneously with the measurement of the gas component by the measurement of ASE14.

FIG. 8 is a graph showing the relationship between the fluorescence intensity of NO gas and the rotational quantum number (J). In FIG. 8, black circles are measured values at 300K, and square marks are measured values at 1250K. The line connecting these plots is fitting using the following equation (1).
This chart is an electronic excitation vibration rotation spectrum from the ground state to the first excited state in the electronic state.

FIG. 9 is a diagram of the LIF excitation spectrum intensity (pump light wavelength 44060 cm ⁻¹ ) of the energy of the pump light in the P ₁₂ branch in the “A ² Σ ⁺ ← X ² ０ (0, 0)” transition at temperatures 300K and 1250K. (It is drawn near the wavelength of 226 nm).

The relative intensity corresponding to the rotational quantum number (J) of this spectral line is measured, and the temperature of the measurement field can be calculated from the measurement result by applying the following equation (1) as a function of temperature.
N _j / N _{j = 0} = (2J + 1) exp (− [(kcBJ) · (J + 1)] / (kT)) (1)
here,
N _j : Number of molecules in the rotational quantum number J (number density)
N _{j = 0} : total number of molecules J: rotational quantum number k: Boltzmann constant c: speed of light B: rotational constant T: temperature (rotational temperature)
It is.

Therefore, the temperature of the exhaust gas can be predicted by obtaining and comparing the signal intensity using the NO-derived fluorescence (NO) 50A. As a result, in the past, for example, the temperature measurement inside the pipe in a thermocouple or the like was a spot temperature measurement, but the average temperature of the entire measurement field (the entire optical path length of the laser beam) can be obtained without contact. it can.
In addition, for separation from the fluorescence derived from hydrocarbon (HC), the fluorescence derived from HC is measured in the range of 350 to 400 nm, and thus the spectrum is dispersed using a spectroscope so as to be 300 nm or less. Thereby, both fluorescence of NO-derived fluorescence (NO) 50A and HC-derived fluorescence (HC) 50B can be measured.

  Therefore, the exhaust gas temperature can be measured online in addition to the normal temperature sensor.

Next, in Example 3, another gas component measuring apparatus of the present invention will be described with reference to the drawings.
FIG. 10 is a schematic diagram of a gas component measuring apparatus according to the third embodiment. As shown in FIG. 10, the gas component measuring apparatus 10 </ b> B according to the present embodiment further includes the first laser beam 22-1 or the second laser beam 22-2 in addition to the fluorescence detection unit 51 illustrated in FIG. 7. The dust detection part 61 which measures the Mie scattered light 60 which the dust which exists in gas emits using any of these is comprised. Thereby, the dust concentration can be obtained by measuring the intensity of the detection signal of the Mie scattered light 60 emitted by the dust by the dust detection unit 61. As the dust detection unit 61, for example, a photodiode (Si semiconductor type or the like) can be exemplified, but the present invention is not limited to this.

Here, when the first laser beam (wavelength: 226 nm) 22-1 having a short wavelength is used, the dust concentration with a small particle size can be measured.
On the other hand, when the second laser beam (wavelength: 600 nm) 22-2 having a long wavelength is used, the dust concentration having a large particle size can be measured.
Therefore, the first laser beam or the second laser beam is selected according to the desired particle size, and choppers 62-1 and 62-2 that block either line are provided.

  When combined with fluorescence analysis, as described in Example 1, first, fluorescence analysis is performed and ASE is measured, and then the first laser beam 22-1 or the second laser beam 22-2 is used. Thus, the dust concentration may be measured.

  Further, as shown in FIG. 11 showing a modification of the present embodiment, delay lines 63-1 and 63-2 having a time delay of about 30 cm / 1 ns, for example, are provided, and the first laser beam 22-1 and the second laser beam 22-1 First, the NO ASE due to fluorescence may be measured using the laser beam 22-2, and then the dust concentration may be measured at different timings. The delay lines 63-1 and 63-2 have the choppers 62-1 and 62-2, respectively.

  As a result of measuring the particulate matter concentration using the gas component measuring device 10B shown in FIG. 10 as described above, if the true particulate matter concentration at the time of measurement exceeds a predetermined threshold, control not shown in the figure. Various engine controls that reduce the particulate matter concentration are performed by the apparatus.

Here, the following control methods can be exemplified as engine control for reducing the particulate matter concentration.
In the diesel engine system 200A shown in FIG. 3-1, as the first engine control, the fuel injection timing of the electromagnetic high-pressure injection system (for example, CRS (common rail fuel injection system)) 220 is advanced to reduce the particulate matter concentration. I try to let them.

  As the second engine control, the fuel injection pressure of an electromagnetic high-pressure injection system (for example, CRS (common rail fuel injection system)) 220 is increased to reduce the particulate matter concentration.

  As the third engine control, the supercharging pressure of the supercharger 111 is increased to reduce the particulate matter concentration.

  In the diesel engine system 200B shown in FIG. 3B, in addition to the first to third engine controls described above, the opening of the EGR valve 211 of the exhaust gas recirculation (EGR) device is further set as the fourth engine control. Aperture and particulate matter concentration are reduced.

  In addition, when the first to fourth engine controls are not performed, if the particulate matter concentration reducing effect is not exhibited, the exhaust gas 201 is controlled to pass through the DPF 230 that removes the particulate matter in the exhaust gas 201. It is intended to prevent discharge to the outside.

  Furthermore, when the particulate matter concentration exceeds a predetermined threshold, an alarm may be issued from a control device (not shown) to stop the engine.

  Here, the control means is constituted by a microcomputer or the like. The control means is composed of a RAM, a ROM, etc., and is provided with a storage unit (not shown) in which programs and data are stored. The data stored in the storage unit checks the concentration of particulate matter in the exhaust gas from the engine, determines whether or not a predetermined threshold is exceeded, and performs control to suppress particulate matter emission. .

  Thus, during engine operation, by measuring the concentration of particulate matter in addition to the exhaust gas properties (NO, CO, HC, etc.), the actual concentration depends on the fuel injection pressure and the supercharging pressure. It is possible to check online how much particulate matter (PM) has been discharged.

  As described above, according to the present invention, by using an engine system equipped with a component measuring device that measures properties in exhaust gas from the engine, for example, during operation of a marine diesel engine, the properties (NO, CO) in the exhaust gas online. , HC, etc.), the concentration of particulate matter can be measured, and appropriate preventive measures against incomplete combustion of the engine (change of ignition timing, change of fuel mixture ratio, change of filter, etc.) can be taken .

  In this embodiment, a marine diesel engine is used as an engine. However, the present invention is not limited to this, and is applied to measurement of exhaust gas properties of various land diesel engines and other gas engines that burn fuel gas. You can also.

10A to 10B Gas component measuring device 11 Gas to be measured 14 ASE
DESCRIPTION OF SYMBOLS 21 Laser apparatus 22 Basic laser light 22-1 1st laser light 22-2 2nd laser light 23 1st wavelength conversion part 24 2nd wavelength conversion part 25 Gas measurement part 26 Photodetector 50 Fluorescence 50A Fluorescence ( NO)
50B fluorescence (HC)
DESCRIPTION OF SYMBOLS 51 Fluorescence detection part 60 Mie scattered light 61 Dust detection part 100 Diesel engine 120 Cylinder 200A-200C Engine system provided with gas component measuring device 201 Exhaust gas 202 Exhaust pipe

Claims (3)

Engine,
An exhaust pipe for exhausting exhaust gas from the engine;
A laser device for irradiating the exhaust gas in the exhaust pipe with laser light,
The laser device is
A first wavelength conversion unit that converts the wavelength of the basic laser light oscillated from the laser irradiation apparatus into a first laser light;
A second wavelength converter that converts the wavelength of the basic laser light into a second laser light;
A gas measuring unit that introduces the first and second laser beams and irradiates the gas component in the gas to be measured;
When excited molecules excited to a high level by the first laser light and the second laser light to be irradiated are electronically relaxed to a low level, spontaneously amplified light generated when the level is lowered ( A photodetector that measures Amplified Spontaneous Emission (ASE);
An engine system comprising a gas component measurement device in exhaust gas, comprising a fluorescence detection unit that measures fluorescence generated by hydrocarbons derived from oil present in the gas to be measured. In claim 1,
An engine system comprising a gas component measuring device in exhaust gas, wherein the gas temperature of the gas to be measured is measured from the relative intensity of fluorescence emitted from the gas component of the gas to be measured. In claim 1 or 2,
A gas component in exhaust gas, comprising a dust detection unit that measures Mie scattered light emitted by the dust present in the gas to be measured using either the first laser light or the second laser light. An engine system with a measuring device.

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