JP5773587B2 - CO removal system and CO removal method - Google Patents

Description

  The present invention relates to a CO removal system for fuel supplied to a fuel electrode of a fuel cell and a CO removal method.

In recent years, a polymer electrolyte fuel cell (PEFC) has low pollution and is further expected to be applied as a power source in a wide range of fields such as automobile power sources and distributed power sources because of its high thermal efficiency. This fuel cell system produces H ₂ by reforming a hydrocarbon-based fuel (city gas, methane, propane, kerosene, dimethyl ether, etc.) with a reformer. However, the reformed gas reformed by the reformer also contains CO and CO _{2 in} addition to H ₂ , and the fuel cell electrode catalyst is poisoned by CO. Therefore, the CO shift reaction is performed by the CO shift catalyst in the CO shift device, and the CO oxidation reaction is performed by the CO removal catalyst in the CO removal device, whereby the concentration of carbon monoxide (CO) contained in the obtained gas. The method of reducing is taken (refer patent document 1). Moreover, in the apparatus described in Patent Document 1, it is described that the CO measuring unit measures the CO concentration downstream of the fuel reforming apparatus (CO removing apparatus).

JP 2007-302533 A

  Here, as a measuring method for measuring the CO concentration, there is a method of calculating the CO concentration from the flow rate assuming that the concentration is constant. However, this method cannot cope with changes in the CO concentration in the fuel gas.

  As a measuring method for measuring the CO concentration, there is a method of measuring the concentration by infrared spectroscopy. However, these measurement methods require a pretreatment device for removing moisture and dust contained in the measurement target gas before measurement. Therefore, it takes time to measure the CO concentration, and even if the control is performed based on the calculated value, a time delay occurs in the control, and the performance deterioration corresponding to the time delay occurs.

  Thus, in any method, there is a problem that measurement with high responsiveness and high accuracy is difficult and there is a limit in reducing CO concentration.

  The present invention has been made in view of the above, and can reduce carbon monoxide from the fuel gas supplied to the fuel electrode of the fuel cell more efficiently and with high probability, thereby suppressing deterioration of the fuel electrode. An object of the present invention is to provide a CO removal system and a CO removal method.

  In order to solve the above-described problems and achieve the object, the present invention provides a CO removal system provided in a fuel supply path for supplying fuel gas to a fuel electrode of a fuel cell, wherein air is supplied to the fuel supply path. A first air supply means for supplying, and in the flow direction of the fuel gas, disposed in the fuel supply path on the downstream side of the first air supply means, and reacting CO and oxygen contained in the fuel gas; A first CO removal catalyst that removes CO contained in the fuel gas, and a fuel that is disposed in the fuel supply path downstream of the first CO removal catalyst in the flow direction of the fuel gas and that has passed through the first CO removal catalyst A measuring means for measuring the concentration of CO contained in the gas; and disposed in the fuel supply path downstream of the measuring means in the flow direction of the fuel gas, to react CO and oxygen contained in the fuel gas. And at least one of the reaction environment of the first CO removal catalyst and the reaction environment of the second CO removal catalyst based on the CO concentration measured by the measurement means and the second CO removal catalyst that removes CO contained in the fuel gas. Control means for controlling, and the measuring means makes the laser light incident on the fuel supply path, and a light emitting section that outputs laser light in the near-infrared wavelength region including the CO absorption wavelength. An optical system, a light receiving portion that receives laser light incident from the light emitting portion and passed through the fuel supply path, an intensity of laser light output from the light emitting portion, and an intensity of laser light received by the light receiving portion. And a calculation unit for calculating the CO concentration of the fuel gas flowing through the fuel supply path.

  By adopting such a configuration for the CO removal system, carbon monoxide can be reduced more efficiently and with high probability from the fuel gas supplied to the fuel electrode of the fuel cell, and the deterioration of the fuel electrode can be suppressed. Can do. Further, by adopting such a configuration for the CO removal system, real-time control, that is, control with high responsiveness can be performed. Thereby, it is possible to stably generate power and to stably output power with a predetermined performance.

  Here, the control means adjusts the amount of air supplied to the fuel supply path by the first air supply means based on the CO concentration, and controls the amount of air supplied to the first CO removal catalyst. Is preferred. Thereby, CO can be more reliably removed by the first CO removal catalyst.

  Further, an upstream side measurement that measures the concentration of CO contained in the fuel gas before passing through the first CO removal catalyst, which is disposed in the fuel supply path upstream of the first CO removal catalyst in the flow direction of the fuel gas. Means for controlling the reaction environment of the first CO removal catalyst based on the CO concentration measured by the upstream measuring means, and the upstream measuring means absorbs the CO. A light emitting unit including a wavelength and outputting a laser beam in a near-infrared wavelength region, an optical system for making the laser beam incident on the fuel supply path, and a laser incident from the light emitting unit and passed through the fuel supply path The CO concentration of the fuel gas flowing through the fuel supply path is calculated based on a light receiving unit that receives light, an intensity of laser light output from the light emitting unit, and an intensity of laser light received by the light receiving unit. Calculation It is preferable to provide a part. Thereby, CO can be more reliably removed by the first CO removal catalyst.

  The control means adjusts the amount of air supplied by the first air supply means to the fuel supply path based on the CO concentration measured by the upstream measuring means, and is supplied to the first CO removal catalyst. It is preferable to control the amount of air. Thereby, CO can be more reliably removed by the first CO removal catalyst.

  And further comprising an upstream temperature adjusting means for adjusting the temperature of the first CO removal catalyst, wherein the control means controls the upstream temperature adjusting means based on the CO concentration measured by the upstream measuring means, and It is preferable to control the reaction temperature of the 1CO removal catalyst

  The control means preferably controls the upstream temperature adjusting means based on the CO concentration measured by the measuring means to control the reaction temperature of the first CO removal catalyst.

  Further, the apparatus further includes an upstream temperature adjusting unit that adjusts the temperature of the first CO removal catalyst, and the control unit controls the upstream temperature adjustment unit based on the CO concentration, and the reaction temperature of the first CO removal catalyst. Is preferably controlled. Thereby, CO can be removed with high probability by the first CO removal catalyst.

  In addition, a downstream side measurement unit that is disposed in the fuel supply path downstream of the second CO removal catalyst in the flow direction of the fuel gas and measures the CO concentration contained in the fuel gas that has passed through the second CO removal catalyst. And the downstream measuring means includes a light emitting unit that includes the CO absorption wavelength and outputs a laser beam in a near infrared wavelength region, and an optical system that causes the laser beam to enter the fuel supply path. Based on the light receiving unit that receives the laser light incident from the light emitting unit and passed through the fuel supply path, the intensity of the laser light output from the light emitting unit, and the intensity of the laser light received by the light receiving unit And a calculating unit that calculates the CO concentration of the fuel gas flowing through the fuel supply path. Thereby, the CO concentration contained in the fuel gas that has passed through the second CO removal catalyst can be measured.

  Here, it is preferable that the control means controls the reaction environment of the second CO removal catalyst based on the CO concentration measured by the downstream measuring means. Thereby, CO can be more reliably removed by the second CO removal catalyst.

  And a second air supply means disposed on the downstream side of the CO measurement unit and on the upstream side of the second CO removal catalyst in the fuel gas flow direction, for supplying air to the fuel supply path, The control means adjusts the amount of air supplied by the second air supply means to the fuel supply path based on the CO concentration measured by the upstream side measurement means, and the amount of air supplied to the second CO removal catalyst. Is preferably controlled. Thereby, CO can be more reliably removed by the second CO removal catalyst.

  The control means adjusts the amount of air supplied to the fuel supply path by the second air supply means based on the CO concentration measured by the measurement means, and supplies the air supplied to the second CO removal catalyst. It is preferred to control the amount. Thereby, CO can be more reliably removed by the second CO removal catalyst.

  And a second air supply means disposed on the downstream side of the CO measurement unit and on the upstream side of the second CO removal catalyst in the fuel gas flow direction, for supplying air to the fuel supply path, The control means adjusts the amount of air supplied by the second air supply means to the fuel supply path based on the CO concentration measured by the measurement means, and controls the amount of air supplied to the second CO removal catalyst. It is preferable to do. Thereby, CO can be more reliably removed by the second CO removal catalyst.

  Further, the apparatus further comprises a downstream temperature adjusting means for adjusting the temperature of the second CO removal catalyst, and the control means controls the downstream temperature adjusting means based on the CO concentration measured by the downstream measuring means, It is preferable to control the reaction temperature of the first CO removal catalyst. Thereby, CO can be more reliably removed by the second CO removal catalyst.

  The control means preferably controls the downstream temperature adjusting means based on the CO concentration measured by the measuring means to control the reaction temperature of the first CO removal catalyst. Thereby, CO can be removed with high probability by the second CO removal catalyst.

  Further, the apparatus further comprises a downstream temperature adjusting means for adjusting the temperature of the second CO removal catalyst, and the control means controls the downstream temperature adjusting means based on the CO concentration measured by the measuring means, and It is preferable to control the reaction temperature of the 1CO removal catalyst. Thereby, CO can be removed with high probability by the second CO removal catalyst.

  In addition, the control unit further includes a downstream air supply unit that is disposed in the fuel supply path downstream of the second CO removal catalyst in the fuel gas flow direction and supplies air to the fuel supply path. Adjusting the amount of air supplied from the downstream air supply means to the fuel supply path based on the CO concentration measured by the downstream measurement means, and controlling the amount of air supplied to the fuel electrode. preferable. Thereby, CO contained in the fuel gas that has passed through the second CO removal catalyst can be removed.

  In order to solve the above-described problems and achieve the object, the present invention is a CO removal method for removing CO from fuel gas flowing through a pipe, and passes through a first CO removal catalyst in the fuel gas flowing through the pipe. And the fuel gas before passing through the second CO removal catalyst includes the absorption wavelength of the fuel gas and outputs a laser beam in the near-infrared wavelength region and passes through the pipeline through which the fuel gas flows. A concentration measuring step of measuring the concentration of CO contained in the fuel gas as a measurement value based on the intensity of the laser beam received and output from the laser beam and the intensity of the laser beam received by the light receiving unit; And a control step for controlling at least one of the amount of oxygen supplied to the pipe and the temperature of the CO removal catalyst that reacts and removes air and CO based on the CO concentration measured in the concentration measurement step. And features.

  By adopting such a configuration for the CO removal method, carbon monoxide can be reduced more efficiently and with high probability from the fuel gas supplied to the fuel electrode of the fuel cell, and the deterioration of the fuel electrode can be suppressed. Can do. Further, by adopting such a configuration for the CO removal method, real-time control, that is, control with high responsiveness can be performed. Thereby, it is possible to stably generate power and to stably output power with a predetermined performance.

  INDUSTRIAL APPLICABILITY The CO removal system and the CO removal method according to the present invention have an effect that carbon monoxide can be reduced from fuel gas more efficiently and with a high probability, and deterioration of the fuel electrode can be suppressed. . Further, there is an effect that power can be stably generated and power can be stably output with a predetermined performance.

FIG. 1 is a block diagram showing a schematic configuration of a power generation system having a CO removal system. FIG. 2 is a block diagram showing a schematic configuration of the CO removal system shown in FIG. FIG. 3 is a block diagram showing a schematic configuration of the CO measuring section shown in FIG. FIG. 4 is a flowchart showing an example of the operation of the CO removal system. FIG. 5 is a flowchart showing an example of the operation of the CO removal system. FIG. 6 is a graph showing an example of the characteristics of the CO removal catalyst. FIG. 7 is a flowchart showing an example of the operation of the CO removal system. FIG. 8 is a block diagram showing a schematic configuration of another example of the CO removal system. FIG. 9 is a block diagram showing a schematic configuration of another example of the CO removal system. FIG. 10 is a block diagram showing a schematic configuration of another example of a power generation system having a CO removal system.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited by the following modes for carrying out the invention (hereinafter referred to as embodiments). In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be appropriately combined.

  Embodiments of a CO removal system and a CO removal method according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. For example, in the following embodiment, since it can be used more appropriately, the CO removal system will be described as a case where it is used for a power generation system, more specifically, a PEFC fuel cell system, but the present invention is not limited to this. Not.

  First, a power generation system using the CO removal system of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a schematic configuration of a power generation system having a CO removal system.

  As shown in FIG. 1, a power generation system (a power generation system for a PEFC type fuel cell) 10 includes a raw fuel supply unit 12, a desulfurization unit 14, a fuel reforming system 16, an air supply unit 24, a valve 25, The fuel cell 26, the refrigerant supply unit 28, the heat dissipation unit 30, and the control unit 32 are included. The fuel reforming system 16 includes a fuel reforming unit 17, a steam supply unit 18, a CO conversion unit 20, and a CO removal system 22. Moreover, the power generation system 10 connects each part with piping.

  The raw fuel supply unit 12 is a mechanism for storing and supplying raw fuel used for power generation of the power generation system 10, that is, fuel before being reformed. As the raw fuel, city gas, LPG gas, kerosene, or the like can be used. The raw fuel supply unit 12 supplies a part of the fuel to the deflowing unit 14 and supplies a part of the fuel to the fuel reforming unit 17 of the fuel reforming system 16.

  The desulfurization unit 14 is a device that removes sulfides from the raw fuel supplied from the raw fuel supply unit 12. The desulfurization unit 14 supplies the raw fuel from which the sulfide is removed to the fuel reforming system 16.

  The fuel reforming system 16 is a system that reforms the raw fuel supplied from the desulfurization unit 14 into a gas that can be supplied to the fuel cell 26. As described above, the fuel reforming unit 17, the steam supply unit 18, , A CO conversion unit 20 and a CO removal system 22.

The fuel reforming unit 17 includes a fuel reforming catalyst unit 44 and a reformer burner 45. Further, the steam supply unit 18 supplies steam to the fuel reforming unit 17. The fuel reforming catalyst unit 44 mixes the raw fuel that has passed through the desulfurization unit 14 and the steam supplied from the steam supply unit 18 to pass the reforming catalyst, and generates hydrogen from the raw fuel and the steam. Has a reforming catalyst. Here, examples of the reforming catalyst include Ru / Al ₂ O _{3 and the} like, but are not limited thereto. The reformer burner 45 burns the raw fuel supplied from the raw fuel supply unit 12 and heats the fuel reforming catalyst unit 44.

The fuel reforming unit 17 is configured as described above. The fuel reforming catalyst unit 44 is heated by the reformer burner 45 and supplied from the raw fuel that has passed through the desulfurization unit 14 and the steam supply unit 18. When an atmosphere in which a mixed gas mixed with water vapor flows is set to a temperature of, for example, 700 to 800 ° C., and a steam reforming reaction (for example, city gas or LPG (main component of propane) is used between raw fuel and water vapor. Causes CH ₄ + H ₂ O → CO + 3H ₂ or C ₃ H ₈ + 3H ₂ O → 3CO + 7H ₂ ) to reform the raw fuel. The fuel reforming unit 17 reforms and sends a fuel gas containing hydrogen and carbon monoxide to the CO conversion unit 20.

  The CO conversion unit 20 is a mechanism that converts carbon monoxide contained in the fuel gas sent from the fuel reforming unit 17. The CO conversion unit 20 is a mechanism that generates a shift reaction in which carbon monoxide is converted to carbon dioxide. For example, the shift reaction is generated by heating the fuel gas to about 200 to 450 ° C. The fuel gas (reformed gas) obtained by converting carbon monoxide in the CO conversion unit 20 is supplied to the CO removal system 22.

  The CO removal system 22 is a mechanism for removing carbon monoxide contained in the fuel gas supplied from the CO conversion unit 20, that is, for removing carbon monoxide that could not be converted into carbon dioxide by the CO conversion unit 20. . The CO removal system 22 supplies the fuel cell 26 with the fuel gas from which the carbon monoxide has been removed. The CO removal system 22 will be described later.

  The air supply unit 24 is a mechanism for supplying air to the air electrode 48 of the fuel cell 26 and the CO removal system 22. The air supply unit 24 includes a pump or the like. The valve 25 is disposed between the air supply unit 24 and the air electrode 48, and adjusts the amount of air supplied from the air supply unit 24 to the air electrode 48.

The fuel cell 26 includes a fuel electrode 46 to which fuel gas is supplied, an air electrode 48 to which air is supplied, and a cooling unit 50 that is supplied with a refrigerant and removes heat generated by an electrochemical reaction during operation. . The fuel cell 26 generates electric power from the fuel gas that has passed through the fuel reforming system 16 and is supplied to the fuel electrode 46 and the air that is supplied from the air supply unit 24 to the air electrode 48 to obtain DC power. The fuel electrode 46 and the air electrode 48 are cooled by the cooling unit 50, and the reaction temperature is adjusted. Further, the fuel cell 26 supplies the fuel gas reacted at the fuel electrode 46 to the reformer burner 45, and the remaining fuel components (CH ₄ , H ₂ ) after passing through the fuel electrode 46 are reformed by the reformer burner. Burn at 45.

  The refrigerant supply unit 28 is a supply mechanism that supplies a refrigerant to the cooling unit 50, and supplies water, air, or the like to the cooling unit 50, for example. The heat radiating unit 30 is a heat radiating mechanism that radiates heat contained in the refrigerant that has passed through the cooling unit 50 and absorbed heat generated in the fuel cell 26. In addition, you may make it the thermal radiation part 30 use the acquired heat | fever for the heat source of another mechanism, for example, the heating of the CO conversion part 20. FIG.

  The control unit 32 controls the operation of each unit of the power generation system 10 so as to start, generate, stop, and alarm / protect the fuel cell 26 fully automatically. The control unit 32 controls each unit as a control unit of the fuel reforming system 16 and a control unit of the CO removal system 22.

  When the fuel cell power generation is started, the control unit 32 of the power generation system 10 supplies raw fuel from the raw fuel supply unit 12 to the reformer burner 45 to raise the temperature of the fuel reforming catalyst unit 44, After setting to a predetermined temperature condition suitable for steam reforming, the raw fuel that has passed through the desulfurization unit 14 from the raw fuel supply unit 12 is supplied to the fuel reforming system 16 to be a reformed gas. Thereafter, the power generation system 10 starts power generation by removing CO from the obtained reformed gas by the CO conversion unit 20 and the CO removal system 22 and supplying the fuel gas to the fuel electrode 46. The control unit 32 supplies air from the air supply unit 24 to the air electrode 48. Further, the exhaust gas from the fuel electrode 46 is sent to the reformer burner 45, and unreacted gas contained in the exhaust gas is combusted. Thereby, raw fuel can be used effectively and the efficiency of power generation with respect to the amount of consumption of raw fuel can be increased.

  Next, the CO removal system 22 will be described with reference to FIG. Here, FIG. 2 is a block diagram showing a schematic configuration of the CO removal system shown in FIG. The CO removal system 22 shown in FIG. 2 includes a first CO removal catalyst 62, a second CO removal catalyst 63, a CO measurement unit 64, a first air supply unit 66, a second air supply unit 68, and a third air supply. Section (downstream air supply section) 69, first temperature adjustment section (upstream temperature adjustment section) 70, and second temperature adjustment section (downstream temperature adjustment section) 71. In addition, some functions of the control unit 32 also constitute the CO removal system 22 and control the operation of each part of the CO removal system 22. The first CO removal catalyst 62, the second CO removal catalyst 63, the CO measurement unit 64, the first air supply unit 66, the second air supply unit 68, and the third air supply unit 69 are pipes (fuel). Supply path) 60. Each part of the CO removal system 22 includes, in the gas flow direction, from the upstream, the first air supply unit 66, the first CO removal catalyst 62, the CO measurement unit 64, the second air supply unit 68, the second CO removal catalyst 63, and the third The air supply units 69 are arranged in this order. A fuel electrode 46 of the fuel cell 26 is connected to the downstream side of the third air supply unit 69 of the pipe 60.

  The first CO removal catalyst 62 is a catalyst that removes CO contained in the fuel gas from the passing fuel gas (reformed gas). Specifically, the first CO removal catalyst 62 is a catalyst that converts CO into another substance. Examples of the first CO removal catalyst 62 include a catalyst formed by mixing and combining at least one of at least one copper-based catalyst or noble metal-based catalyst. Specifically, a copper catalyst having a diameter of 20 μm, for example, and a noble metal catalyst having a diameter of 20 μm in which a noble metal such as Pt is supported on an oxide carrier are mechanically mixed in a powder state to thereby form a copper A catalyst having a configuration in which the distance between the catalyst and the noble metal catalyst is appropriately maintained can be used.

  The copper-based catalyst is an active component composed of metallic copper or copper oxide and supports the active component, and includes aluminum oxide, cerium oxide, zirconium oxide, zinc oxide, lead oxide, manganese oxide, nickel oxide, and oxidation. It refers to a catalyst comprising a carrier comprising at least one oxide of titanium, iron oxide, vanadium oxide, cobalt oxide, chromium oxide, and metal silicate. Further, the copper-based catalyst may be a perovskite complex oxide containing the metal copper or the copper oxide as an active component.

  By using a perovskite complex oxide as a copper-based catalyst, copper is taken into the perovskite crystal structure and is not reduced during the removal of carbon monoxide (CO), and carbon monoxide ( CO) can be removed. In addition, since the active species is stably supported in the perovskite crystal structure, the life of the catalyst can be extended.

  The noble metal refers to any one of gold, platinum, ruthenium, palladium and rhodium or a mixture thereof. Further, as the carrier for supporting the noble metal catalyst, for example, a heat-resistant carrier such as alumina, zirconia, or silica is preferable. Furthermore, for example, a composite oxide such as alumina-silica or alumina-zirconia may be used.

  The second CO removal catalyst 63 is a catalyst that removes CO contained in the fuel gas from the passing fuel gas (reformed gas). Specifically, the second CO removal catalyst 63 is a catalyst that transforms CO into another substance. Is disposed downstream of the first CO removal catalyst 62 in the flow direction. Various catalysts can be used for the second CO removal catalyst 63 in the same manner as the first CO removal catalyst 62. The second CO removal catalyst 63 is preferably a catalyst whose reaction is activated at a temperature higher than that of the first CO removal catalyst 62. That is, as the second CO removal catalyst 63, it is preferable to use a catalyst having a removal rate (conversion rate) peak at a temperature higher than the temperature of the removal rate peak of the first CO removal catalyst 62. Thereby, CO can be suitably removed by the second CO removal catalyst 63 from the fuel gas whose temperature has increased due to the occurrence of the reaction for removing CO by the first CO removal catalyst 62.

For example, when a Cu / Al ₂ O ₃ catalyst is used for the first CO removal catalyst 62, it is preferable to use a Cu / CeO ₂ catalyst for the _second CO removal catalyst 63. Further, the catalyst temperature of the Cu / Al ₂ O ₃ catalyst is preferably in the range of 120 ° C. to 140 ° C., for example, and the catalyst temperature of the Cu / CeO ₂ catalyst is preferably in the range of 140 ° C. to 160 ° C., for example.

  The CO measurement unit 64 is disposed downstream of the first CO removal catalyst 62 and upstream of the second CO removal catalyst 63 in the flow direction of the fuel gas, passes through the first CO removal catalyst 62, and The concentration of CO contained in the fuel gas before passing through the 2CO removal catalyst 63 is measured. Hereinafter, the CO measuring unit 64 will be described with reference to FIG. Here, FIG. 3 is a block diagram showing a schematic configuration of the CO measuring section shown in FIG. As shown in FIG. 3, the CO measurement unit 64 includes a measurement unit 102 and a measurement means main body 104. The measurement unit 102 is provided on the downstream side of the arrangement position of the first CO removal catalyst 62 in the pipe 60, and measures the concentration of CO in the fuel gas flowing through the pipe 60 and passing through the first CO removal catalyst 62. The measurement unit 102 measures the gas concentration by causing the laser light, which is measurement light, to enter the pipe 60 and receiving the laser light that has passed through the pipe 60.

  The measurement unit 102 includes an incident tube 112, an exit tube 114, windows 116 and 118, an optical fiber 120, a light incident unit 122, and a light receiving unit 124.

  The incident tube 112 is a tubular member, and one end thereof is connected to the pipe 60. Further, in the pipe 60, the connection portion with the incident tube 112 is an opening having substantially the same shape as the opening (end opening) of the incident tube 112. That is, the incident tube 112 is connected to the pipe 60 in a state where air can flow. A window 116 is provided at the other end of the incident tube 112 and is sealed by the window 116. The window 116 is made of a light transmitting member such as transparent glass or resin. As a result, the incident tube 112 is in a state where the end portion where the window 116 is provided is in a state where no air flows and the light can pass therethrough.

  As shown in FIG. 3, the incident tube 112 has an area of an opening at the end of the window 116 (that is, an opening closed by the window 116) and an opening at the end of the piping 60 (that is, the piping 60. And the area of the opening of the portion connected to the cylindrical shape is substantially the same. The shape of the incident tube 112 is not limited to a cylindrical shape, and may be any shape as long as it is a cylindrical shape that allows air and light to pass therethrough. For example, the cross section may be a square, a polygon, an ellipse, or an asymmetric curved surface. Moreover, the shape of the cross section of a cylindrical shape and the shape from which a diameter changes with positions may be sufficient.

  The exit tube 114 is a tubular member having substantially the same shape as the entrance tube 112, one end is connected to the pipe 60, and the exit 118 is provided with a window 118 at the other end. The exit pipe 114 is also in a state where air can flow through the pipe 60, and an end portion provided with the window 118 is in a state where air does not flow and light can pass therethrough. Further, the emission tube 114 is disposed at a position where the central axis is substantially the same as the central axis of the incident tube 112. That is, the incident tube 112 and the emission tube 114 are disposed at positions facing each other in the pipe 60.

  The exit pipe 114 is also connected to the area of the opening at the end on the window 118 side (that is, the opening closed by the window 118) and the opening at the end on the pipe 60 side (that is, the pipe 60). The area of the partial opening) is substantially the same cylindrical shape. The shape of the exit tube 114 is not limited to a cylindrical shape, and may be any shape as long as it has a cylindrical shape that allows air and light to pass therethrough. For example, the cross section may be a square, a polygon, an ellipse, or an asymmetric curved surface. Moreover, the shape of the cross section of a cylindrical shape and the shape from which a diameter changes with positions may be sufficient.

  Next, the optical fiber 120 guides the laser light output from the measuring means main body 104 to the light incident part 122. That is, the laser beam output from the measuring unit main body 104 is incident on the light incident part 122. The light incident part 122 is an optical system (mirror, lens, etc.) disposed in the window 116, and makes the laser light guided by the optical fiber 120 enter the inside of the incident tube 112 from the window 116. The laser light incident on the incident tube 112 passes through the pipe 60 from the incident tube 112 and reaches the output tube 114.

  The light receiving unit 124 is a light receiving unit that receives the laser light that passes through the pipe 60 and is output from the window 118. The light receiving unit 124 sends the intensity of the received laser light to the measuring means body 104 as a light reception signal.

  The measuring means main body 104 includes a light emitting unit 126, a light source driver 128, and a calculating unit 130. The light emitting unit 126 is a light emitting element that emits laser light in the near infrared wavelength region (laser light including the absorption wavelength of CO) absorbed by CO (carbon monoxide). As the light emitting element, for example, a laser diode (LD) can be used. The light emitting unit 126 causes the emitted light to enter the optical fiber 120.

  The light source driver 128 has a function of controlling the driving of the light emitting unit 126 and adjusts the wavelength and intensity of the laser light output from the light emitting unit 126 by adjusting the current and voltage supplied to the light emitting unit 126.

  The calculation unit 130 calculates the concentration of the substance to be measured based on the signal of the intensity of the laser light received by the light receiving unit 124 and the conditions for driving the light source driver 128. Specifically, the calculation unit 130 calculates the intensity of the laser light output from the light emitting unit 126 and incident on the pipe 60 based on the conditions for driving the light source driver 128, and the laser received by the light receiving unit 124. Compared with the intensity of light, the concentration of the substance to be measured (carbon monoxide) contained in the fuel gas flowing through the pipe 60 is calculated.

  The CO measuring unit 64 is configured as described above, and the near-infrared wavelength laser beam output from the light emitting unit 126 is a predetermined path from the optical fiber 120, specifically, the light incident unit 122 and the window 116. The light passes through the incident tube 112, the pipe 60, the exit tube 114, and the window 118 and reaches the light receiving unit 124. At this time, if the measurement target substance (CO) is contained in the fuel gas in the pipe 60, the laser light passing through the pipe 60 is absorbed. Therefore, the output of the laser light reaching the light receiving unit 124 changes depending on the concentration of the substance to be measured in the fuel gas. The light receiving unit 124 converts the received laser light into a light reception signal and outputs it to the calculation unit 130. Further, the light source driver 128 outputs the intensity of the laser beam output from the light emitting unit 126 to the calculating unit 130. The calculation unit 130 compares the intensity of the light output from the light emitting unit 126 with the intensity calculated from the received light signal, and calculates the concentration of the measurement target substance of the fuel gas flowing in the measurement unit 104 from the decrease rate. . As described above, the CO measurement unit 64 uses a so-called TDLAS method (Tunable Diode Laser Absorption Spectroscopy), and piping based on the intensity of the output laser light and the received light signal detected by the light receiving unit 124. The concentration of the substance to be measured in the fuel gas passing through a predetermined position in 60, that is, the measurement position, is calculated and / or measured. The CO measuring unit 64 can continuously calculate and / or measure the concentration of the substance to be measured. The CO measurement unit 64 sends the measured CO concentration to the control unit 32.

  Returning to FIG. 2, the description of the CO removal system 22 will be continued. The first air supply unit 66 is a mechanism that supplies the air supplied from the air supply unit 24 to the pipe 60. The first air supply unit 66 includes a pipe 72 and a valve 74. The pipe 72 has one end connected to the air supply unit 24 and the other end connected to the pipe 60. Further, the other end of the pipe 72 is connected to a pipe 60 in a portion upstream of the first CO removal catalyst 62 in the fuel gas flow direction. The valve 74 is provided in the pipe 72 and adjusts the amount of air supplied from the air supply unit 24 to the pipe 60 by adjusting the opening degree. The first air supply unit 66 has the above-described configuration, and adjusts the amount of air supplied to the pipe 60 by adjusting the opening degree of the valve 74 and is mixed into the fuel gas supplied to the first CO removal catalyst 62. Adjust the amount of air.

  The second air supply unit 68 is also a mechanism that supplies the air supplied from the air supply unit 24 to the pipe 60. The second air supply unit 68 includes a pipe 76 and a valve 78. The pipe 76 has one end connected to the air supply unit 24 and the other end connected to the pipe 60. Further, the other end of the pipe 76 is connected to the pipe 60 at a portion downstream of the CO measuring section 64 and upstream of the second CO removal catalyst 63 in the fuel gas flow direction. That is, the pipe 76 is connected to the pipe 60 downstream of the first CO removal catalyst 62 and upstream of the second CO removal catalyst 63. The valve 78 is provided in the pipe 76 and adjusts the amount of air supplied from the air supply unit 24 to the pipe 60 by adjusting the opening degree. The second air supply unit 68 has the above-described configuration, and adjusts the amount of air supplied to the pipe 60 by adjusting the opening degree of the valve 78 and is mixed into the fuel gas supplied to the second CO removal catalyst 63. Adjust the amount of air.

  The third air supply unit 69 is also a mechanism that supplies the air supplied from the air supply unit 24 to the pipe 60. The third air supply unit 69 includes a pipe 80 and a valve 82. The pipe 80 has one end connected to the air supply unit 24 and the other end connected to the pipe 60. Further, the other end of the pipe 80 is connected to a pipe 60 at a portion downstream of the second CO removal catalyst 63 in the fuel gas flow direction. That is, the pipe 80 is connected to the pipe 60 downstream of the second CO removal catalyst 63 and upstream of the fuel electrode 46. The valve 82 is provided in the pipe 80 and adjusts the amount of air supplied from the air supply unit 24 to the pipe 60 by adjusting the opening degree. The third air supply unit 69 has the above-described configuration, and adjusts the amount of air supplied to the pipe 60 by adjusting the opening degree of the valve 82, so that the air mixed in the fuel gas supplied to the fuel electrode 46. Adjust the amount.

  Next, the first temperature adjustment unit 70 includes a temperature adjustment mechanism 84 and a temperature control unit 86, and adjusts the temperature of the first CO removal catalyst 62. The temperature adjustment mechanism 84 is a heating and / or cooling mechanism disposed around the first CO removal catalyst 62, and heats and / or cools the first CO removal catalyst 62. As the temperature adjustment mechanism 84, various heating mechanisms and cooling mechanisms can be used. As the heating mechanism, a mechanism for heating the first CO removal catalyst 62 by burning fuel, or a mechanism for heating by passing a heated medium such as water vapor or a solvent around the first CO removal catalyst 62 can be used. . Moreover, as a cooling mechanism, the mechanism cooled by water cooling and the mechanism cooled by air cooling can be used. The temperature control unit 86 is a control unit that controls heating and cooling of the first CO removal catalyst 62 by the temperature adjustment mechanism 84. The temperature control unit 86 controls the operation of the temperature adjustment mechanism 84 to bring the temperature of the first CO removal catalyst 62 into a predetermined state. The first temperature adjustment unit 70 includes a temperature detection unit that detects the temperature of the first CO removal catalyst 62 or the temperature of the atmosphere of the first CO removal catalyst 62, and controls the temperature based on the detection result of the temperature detection unit. It is preferable to carry out.

  Next, the second temperature adjustment unit 71 includes a temperature adjustment mechanism 88 and a temperature control unit 90, and adjusts the temperature of the second CO removal catalyst 63. The temperature adjustment mechanism 88 is a heating and / or cooling mechanism disposed around the second CO removal catalyst 63, and heats and / or cools the second CO removal catalyst 63. As the temperature adjustment mechanism 88, various heating mechanisms and cooling mechanisms can be used. The temperature control unit 90 is a control unit that controls heating and cooling of the second CO removal catalyst 63 by the temperature adjustment mechanism 88. The temperature control unit 90 controls the operation of the temperature adjustment mechanism 88 to bring the temperature of the second CO removal catalyst 63 into a predetermined state. The second temperature adjustment unit 71 includes a temperature detection unit that detects the temperature of the second CO removal catalyst 63 or the temperature of the atmosphere of the second CO removal catalyst 63, and controls the temperature based on the detection result of the temperature detection unit. It is preferable to carry out.

  Further, the control unit 32 controls at least one of the first air supply unit 66, the second air supply unit 68, the first temperature adjustment unit 70, and the second temperature adjustment unit 71 based on the measurement result of the CO measurement unit 64. It controls and removes and reduces CO contained in the fuel gas supplied to the fuel electrode 46.

  Next, the operation of the CO removal system 22 will be described with reference to FIG. Here, FIG. 4 is a flowchart showing an example of the operation of the CO removal system. First, an example of the operation of the CO removal system will be described with reference to FIG. Here, FIG. 4 is an example in which the operation of the first air supply unit 66 is controlled based on the measurement result of the CO measurement unit 64.

  The control unit 32 of the CO removal system 22 first measures the CO concentration as step S10. That is, the control unit 32 measures the concentration of CO contained in the fuel gas by the CO measurement unit 64. In addition, the measurement method can be used for the measurement (measurement) method of CO concentration by the CO measurement part 64 by the method mentioned above.

  After measuring the CO concentration in step S10, the control unit 32 determines whether the measured CO concentration is larger than the upper limit target value in step S12. If the control unit 32 determines that the CO concentration measured in step S12 is larger than the upper limit target value (Yes), the control unit 32 proceeds to step S14 and increases the currently set air supply amount by a certain amount. That is, the amount of air supplied from the first air supply unit 66 to the pipe 60 is increased by a certain amount. Thereafter, the control unit 32 proceeds to step S20.

  If the control unit 32 determines in step S12 that the measured CO concentration is equal to or lower than the upper limit target value (No), the control unit 32 proceeds to step S16 and determines whether the measured CO concentration is smaller than the lower limit target value. To do. If it is determined in step S16 that the measured CO concentration is smaller than the lower limit target value (Yes), the control unit 32 proceeds to step S18 and reduces the currently set air supply amount by a certain amount. That is, the amount of air supplied from the first air supply unit 66 to the pipe 60 is reduced by a certain amount. Thereafter, the control unit 32 proceeds to step S20. If the control unit 32 determines in step S16 that the measured CO concentration is equal to or higher than the lower limit target value (No), the control unit 32 proceeds to step S20.

  In step S20, the control unit 32 determines whether the power generation system 10 is stopped (that is, whether the discharge of fuel gas is stopped). If it is determined in step S20 that the fuel gas discharge has not stopped (No), the control unit 32 proceeds to step S10 and repeats the above-described processing. On the other hand, the control part 32 will complete | finish a process, if it determines with discharge | emission of fuel gas having stopped in step S20 (Yes).

  In this way, the CO removal system 22 controls the amount of air supplied from the first air supply unit 66 to the pipe 60. In the above control, the air supply amount is increased or decreased by a certain amount, but the present invention is not limited to this. For example, when the CO concentration is equal to or higher than the upper limit target value, the air supply amount may be a preset reference value, and when the CO concentration is equal to or lower than the lower limit target value, the air supply amount may be set to zero. Further, the air supply amount may be adjusted by the number of opening and closing of the valve, or may be adjusted by the opening and closing degree of the valve. Further, the amount of air supplied from the air supply unit 24 may be adjusted. Further, the upper limit target value and the lower limit target value of the CO concentration may be different values or the same value. That is, the upper limit target value used in step S12 and the lower limit target value used in step S16 may be different target values. By setting the upper limit target value and the lower limit target value of the CO concentration to be different values, the CO concentration range in which the air supply amount is not changed can be made a constant concentration range.

  The power generation system 10 and the CO removal system 22 are configured as described above, and the reformed gas (fuel gas) generated by reforming the raw fuel is removed by the CO conversion unit 20 and the CO removal system 22. After that, it can be supplied to the fuel electrode 46 as a fuel gas from which CO has been removed and reduced. Thus, by removing and reducing CO from the fuel gas, specifically, by reducing the CO contained in the fuel gas to 10 ppm or less, performance deterioration of the fuel electrode 46 can be suppressed, and the power generation system 10 Can extend the lifetime of

  Further, the CO removal system 22 can more reliably remove CO by providing two catalysts, the first CO removal catalyst 62 and the second CO removal catalyst 63. Further, as in the present embodiment, by using a catalyst in which the temperature range in which the reaction is activated is different between the first CO removal catalyst 62 and the second CO removal catalyst 63, specifically, the catalyst is disposed more downstream. The second CO removal catalyst 63 that is used can remove CO more efficiently by using a catalyst that has a higher temperature range in which the reaction is activated than the first CO removal catalyst 62. That is, since the downstream CO removal catalyst can efficiently remove CO at a higher temperature, it can efficiently remove CO even if the temperature of the fuel gas rises due to the heat generated during CO removal. . That is, according to the present embodiment, the catalyst can be arranged according to the temperature of the fuel gas in the reacting region, and CO can be efficiently removed. Further, since CO can be efficiently removed, even when an inexpensive and low performance catalyst is used, CO can be appropriately reduced, and the apparatus cost can be reduced. Specifically, CO can be appropriately removed even when a non-noble metal catalyst is used as the catalyst.

  Further, the CO removal system 22 measures the CO concentration that has passed through the first CO removal catalyst 62, and controls the amount of air supplied from the first air supply unit 66 to the pipe 60 according to the result. In this way, by controlling the air supply amount based on the CO concentration contained in the fuel gas that has passed through the first CO removal catalyst 62, the air supply amount can be adjusted according to the reaction state of air and carbon monoxide. Can be controlled. In addition, since the first CO removal catalyst 62 can efficiently remove CO, the amount of CO removed by the second CO removal catalyst 63 can be reduced. As described above, since the amount of CO removed by the second CO removal catalyst 63 is reduced, CO can be more accurately removed by the second CO removal catalyst 63. As a result, the amount of CO that reaches the fuel electrode 46 can be reduced more reliably.

  Further, the CO removal system 22 can measure the CO concentration in the fuel gas accurately and continuously in a short time by detecting the CO concentration by the CO measuring unit 64. By using a method of irradiating near-infrared wavelength laser light in the absorption wavelength range of the substance to be measured as the CO measuring unit 64 and detecting the intensity absorbed by the substance to be measured, in a short time, In addition, the concentration of the substance to be measured can be measured with high accuracy. Thereby, the concentration distribution can be calculated in a short time, and control can be performed with high responsiveness (for example, real-time control). Furthermore, the time from the start of measurement to the calculation of the measurement result can be shortened, the measurement time delay can be shortened, and the air supply amount can be controlled more accurately. In other words, since the time lag can be further reduced, it is possible to quickly cope with changes in conditions and the like, and changes in CO concentration and emission amount. Thereby, removal of CO can be controlled more suitably. In particular, in the case of operation with large fluctuations, the concentration of the generated gas also fluctuates. However, the CO removal system 22 can control power with high responsiveness even when fluctuations are large as described above, thereby stably generating power. Can maintain a certain level of performance.

  Further, the CO removal system 22 irradiates a laser beam in the near infrared wavelength region of the absorption wavelength region of the substance to be measured as the CO measurement unit 64 and detects the intensity absorbed by the substance to be measured. The concentration of the substance to be measured can be measured in a short time and with high accuracy. Furthermore, in measurement using laser light in the near-infrared wavelength region, the concentration of the substance to be measured can be appropriately measured even when components other than the substance to be measured are mixed. That is, it is possible to make it difficult for components other than the conversion object to be measured to become noise. Moreover, since measurement is possible without performing preprocessing, the fuel gas flowing through the power generation system 10 can be directly measured.

  In addition, since the power generation system 10 uses a catalyst that is a mixture of at least one copper-based catalyst or noble metal-based catalyst in combination with the CO removal system 22 as a CO removal catalyst, the power generation system 10 is inexpensive and long-term. Since CO can be removed over a long period of time, a fuel gas with reduced CO can be stably obtained, and a fuel cell system that is stable and highly reliable over a long period of time can be provided.

  In the example shown in FIG. 4, the amount of air supplied from the first air supply unit 66 to the pipe 60 is controlled, but the present invention is not limited to this. The CO removal system 22 controls the amount of air supplied from the second air supply unit 68 to the pipe 60 instead of controlling the amount of air supplied from the first air supply unit 66 to the pipe 60. Also good. In this case as well, the flow rate control based on the measurement result of the CO concentration may be performed in the same manner as in the flowchart shown in FIG.

  First, the CO removal system 22 uses the second air supply unit 68 to supply air to the fuel gas that has passed through the first CO removal catalyst 62, so that the second CO removal catalyst 63 generates CO and air (oxygen). The second CO removal catalyst 63 can remove CO contained in the fuel gas. Thereby, the amount of CO reaching the fuel electrode 46 can be reduced, and the reduction in the performance of the fuel electrode 46 can be suppressed.

  Further, CO contained in the fuel gas that has passed through the CO measuring unit 64 can be suitably removed. As described above, the CO measuring unit 64 can measure the CO concentration in a short time. For this reason, the CO removal system 22 can supply air when the fuel gas whose CO concentration is measured flows and reaches the second air supply unit 68. Thereby, necessary and sufficient air can be suitably supplied, and CO can be efficiently removed. That is, the CO concentration contained in the fuel gas upstream of the second CO removal catalyst 63 is measured, and an amount of air that can remove the measurement result CO is supplied to remove the CO by the second CO removal catalyst 63. Thus, CO can be efficiently removed.

  Further, the CO removal system 22 adjusts the amount of air supplied from the second air supply unit 68 in accordance with the CO concentration contained in the fuel gas that has passed through the first CO removal catalyst 62, so that necessary and sufficient air is fueled. It can supply to gas and it can suppress that air and hydrogen in fuel gas react. Thereby, by supplying air, the amount of hydrogen reduction in the fuel gas can be reduced, and the reduction in power generation efficiency can be suppressed. That is, it is possible to generate power well while suppressing a reduction in performance of the power generation system.

  Next, another example of the operation of the CO removal system 22 will be described with reference to FIG. Here, FIG. 5 is a flowchart showing an example of the operation of the CO removal system. FIG. 5 is a flowchart showing an operation when the operation of the first temperature adjustment unit 70 is controlled based on the measurement result of the CO measurement unit 64. In the operation of the CO removal system 22, the same operations as those in the flowchart shown in FIG. 4 are denoted by the same step numbers, and detailed description thereof is omitted.

  The control unit 32 of the CO removal system 22 first measures the CO concentration as step S10. After measuring the CO concentration in step S10, the control unit 32 determines whether the measured CO concentration is larger than the upper limit target value in step S12. If the control unit 32 determines that the CO concentration measured in step S12 is larger than the upper limit target value (Yes), the control unit 32 proceeds to step S34, and the temperature of the first CO removal catalyst 62 is increased by a constant temperature from the currently set temperature. Let That is, the heating amount by the first temperature adjusting unit 70 is increased or the cooling amount by the first temperature adjusting unit 70 is reduced. Thereafter, the control unit 32 proceeds to step S20.

  If the control unit 32 determines in step S12 that the measured CO concentration is equal to or lower than the upper limit target value (No), the control unit 32 proceeds to step S16 and determines whether the measured CO concentration is smaller than the lower limit target value. To do. If the control unit 32 determines in step S16 that the measured CO concentration is smaller than the lower limit target value (Yes), the control unit 32 proceeds to step S38, and changes the temperature of the first CO removal catalyst 62 from the currently set temperature to a constant temperature. Reduce. That is, the heating amount by the first temperature adjusting unit 70 is reduced or the cooling amount by the first temperature adjusting unit 70 is increased. Thereafter, the control unit 32 proceeds to step S20. If the control unit 32 determines in step S16 that the measured CO concentration is equal to or higher than the lower limit target value (No), the control unit 32 proceeds to step S20.

  In step S20, the control unit 32 determines whether the power generation system 10 is stopped (that is, whether the discharge of fuel gas is stopped). If it is determined in step S20 that the fuel gas discharge has not stopped (No), the control unit 32 proceeds to step S10 and repeats the above-described processing. On the other hand, the control part 32 will complete | finish a process, if it determines with discharge | emission of fuel gas having stopped in step S20 (Yes).

  In this way, the CO removal system 22 controls the temperature of the first CO removal catalyst 62 by the first temperature adjustment unit 70. In the above control, the heating amount and the cooling amount are increased or decreased by a certain amount, but the present invention is not limited to this. For example, the cooling amount may be set to 0 when the CO concentration is equal to or higher than the upper limit target value, and the heating amount may be set to 0 when the CO concentration is equal to or lower than the lower limit target value.

  As described above, the CO removal system 22 measures the CO concentration that has passed through the first CO removal catalyst 62, controls the operation of the first temperature adjustment unit 70 according to the result, and controls the temperature of the first CO removal catalyst 62. doing. In this way, by controlling the temperature of the first CO removal catalyst 62 based on the CO concentration contained in the fuel gas that has passed through the first CO removal catalyst 62, CO removal is performed in accordance with the reaction state of air and carbon monoxide. The temperature of the catalyst can be controlled.

Thereby, even if the characteristic of the 1st CO removal catalyst 62 changes with use, reaction environment can be adjusted according to the change. Here, FIG. 6 is a graph showing an example of the characteristics of the CO removal catalyst. In FIG. 6, the horizontal axis represents temperature, and the vertical axis represents CO conversion. As shown in FIG. 6, the CO removal catalyst has a limited temperature range in which CO can be efficiently converted into another substance (basically CO ₂ ). Specifically, in the relationship shown in FIG. 6, the conversion rate (removal rate) is highest at the temperature T1, and the temperature range where the conversion rate (removal rate) η1 is higher than the temperature T1 is ΔT. Become. Moreover, this temperature range changes with use. Therefore, as in the present embodiment, by adjusting the temperature based on the CO concentration, the first CO removal catalyst 62 can be set to a temperature at which CO can be efficiently removed. Thereby, CO removal system 22 can remove CO suitably also by adjusting temperature.

  In the flow chart shown in FIG. 5, the increase and decrease of the temperature of the CO removal catalyst are switched based on the lower limit and the upper limit of the CO concentration. Control may be made so that the temperature can be more efficiently removed by switching between lowering and lowering.

  Moreover, in the said embodiment, although the temperature of the 1st CO removal catalyst 62 was adjusted with the 1st temperature adjustment part 70 based on the measurement result of the CO measurement part 64, based on the measurement result of the CO measurement part 64, 2nd The temperature of the second CO removal catalyst 63 may be adjusted by the temperature adjustment unit 71. That is, the CO removal system 22 may adjust the temperature of the second CO removal catalyst 63 that passes thereafter based on the CO concentration of the fuel gas measured by the CO measurement unit 64. Even when the temperature of the second CO removal catalyst 63 is adjusted by the second temperature adjustment unit 71, CO can be efficiently removed by the same control as in the flowchart shown in FIG.

  Next, another example of the operation of the CO removal system 22 will be described with reference to FIG. Here, FIG. 7 is a flowchart showing an example of the operation of the CO removal system. FIG. 7 is a flowchart showing an operation when controlling the operations of a plurality of objects based on the measurement result of the CO measurement unit 64.

  First, the control unit 32 of the CO removal system 22 measures the CO concentration as step S40. After measuring the CO concentration in step S40, the controller 32 calculates each value to be controlled in step S42. That is, the control value of the control target is calculated. Note that the control target is at least one of the first air supply unit 66, the second air supply unit 68, and the first temperature adjustment unit 70. Further, the control unit 32 calculates a control value that can further reduce the CO concentration as the control value.

  When each value is calculated in step S42, the control unit 32 controls the control target as step S44 based on the value calculated in step S42. That is, the amount of air supplied from the first air supply unit 66 and / or the second air supply unit 68 is increased or decreased, and the heating amount and the cooling amount by the first temperature adjustment unit 70 and / or the second temperature adjustment unit 71 are increased. Increase or decrease. After performing the control in step S44, the control unit 32 proceeds to step S46.

  In step S46, the control unit 32 determines whether the power generation system 10 is stopped (that is, whether the discharge of fuel gas is stopped). If it is determined in step S46 that the fuel gas discharge has not stopped (No), the control unit 32 proceeds to step S40 and repeats the above-described processing. On the other hand, the control part 32 will complete | finish a process, if it determines with discharge | emission of fuel gas having stopped in step S46 (Yes).

  In this way, the CO removal system 22 can perform control more suitably by controlling a plurality of control objects based on the measurement result of the CO measurement unit 64. That is, the CO removal system 22 controls the first air supply unit 66, the second air supply unit 68, the first temperature adjustment unit 70, and the second temperature adjustment unit 71 in combination as necessary, thereby further reducing CO. It can be suitably removed.

  The CO removal system 22 may control any of the first air supply unit 66, the second air supply unit 68, the first temperature adjustment unit 70, and the second temperature adjustment unit 71, but the fuel electrode 46. It is preferable to control in order of the 1st air supply part 66 and / or the 2nd air supply part 68, the temperature adjustment part 70, and / or the 2nd temperature adjustment part 71 from a viewpoint of the influence which it has on, and the ease of control. . In addition, the CO removal system 22 can control the reaction environment in the first CO removal catalyst 62 by controlling either the first air supply unit 66 or the first temperature adjustment unit 70, and the second air By controlling either the supply unit 68 or the second temperature adjustment unit 71, the reaction environment in the second CO removal catalyst 63 can be controlled.

  Next, another example of the CO removal system will be described with reference to FIG. Here, FIG. 8 is a block diagram showing a schematic configuration of another example of the CO removal system. The CO removal system 131 shown in FIG. 8 is the same as the CO removal system 22 shown in FIG. 2 except for the point that the CO measurement unit 132 is provided. Therefore, the same components as those of the CO removal system 22 are denoted by the same reference numerals, description thereof will be omitted, and points unique to the CO removal system 131 will be described below.

  A CO removal system 131 shown in FIG. 8 includes a first CO removal catalyst 62, a second CO removal catalyst 63, a CO measurement unit 64, a first air supply unit 66, a second air supply unit 68, and a third air supply. Unit 69, first temperature adjustment unit 70, second temperature adjustment unit 71, and CO measurement unit (downstream CO measurement unit) 132. In addition, some functions of the control unit 134 also constitute the CO removal system 131 and control the operation of each unit of the CO removal system 131. The first CO removal catalyst 62, the second CO removal catalyst 63, the CO measurement unit 64, the first air supply unit 66, the second air supply unit 68, the third air supply unit 69, and the CO measurement unit 132. Is connected to the pipe 60. Each part of the CO removal system 22 has a first air supply unit 66, a first CO removal catalyst 62, a CO measurement unit 64, a second air supply unit 68, a second CO removal catalyst 63, and a CO measurement from upstream in the gas flow direction. The unit 132 and the third air supply unit 69 are arranged in this order. A fuel electrode 46 of the fuel cell 26 is connected to the downstream side of the third air supply unit 69 of the pipe 60.

  The CO measurement unit 132 is disposed in the pipe 60 in a portion downstream of the second CO removal catalyst 63 and upstream of the third air supply unit 69 in the fuel gas flow direction. The CO measurement unit 132 measures the CO concentration contained in the fuel gas before passing through the second CO removal catalyst 63 and reaching the third air supply unit 66. The CO measurement unit 132 is the same as the CO measurement unit 64 in the apparatus configuration and the CO concentration measurement method, except for the arrangement position. The CO measurement unit 132 sends the measured CO concentration to the control unit 134.

  Based on the measurement result of the CO concentration at the CO measurement unit 132 in addition to the measurement result of the CO concentration at the CO measurement unit 64, the control unit 134 performs the first air supply unit 66, the second air supply unit 68, the first One of the temperature adjustment unit 70 and the second temperature adjustment unit 71 is controlled. Note that the control unit 134 controls the reaction environment in the second air supply unit 68 or the second temperature adjustment unit 71, that is, the CO removal catalyst, based on the measurement result of the CO concentration in the CO measurement unit 132. To do.

  In this way, the CO removal system 131 uses the control unit 134 based on the measurement result of the CO concentration in the CO measurement unit 132, that is, either the second air supply unit 68 or the second temperature adjustment unit 71, that is, the first By controlling the reaction environment in the 2CO removal catalyst 63, the reaction environment can be controlled based on the CO concentration contained in the fuel gas after passing through the second CO removal catalyst 63. Thereby, the CO removal system 131 can remove CO more suitably.

  Further, the CO removal system 131 can further calculate the processing state in the second CO removal catalyst 63 by performing control using the measurement results of the CO measurement unit 64 and the CO measurement unit 132, and more. The reaction environment can be suitably adjusted. That is, the CO removal system 131 can determine the reduction amount of CO with respect to the input amount of air and the temperature of the second CO removal catalyst 63 from the measurement results of the CO measurement unit 64 and the CO measurement unit 132. Control can be performed based on the result.

  Further, the CO removal system 131 may be replaced with or in addition to controlling the amount of air supplied from the first air supply unit 66 and / or the second air supply unit 68 to the pipe 60. The amount of air supplied from 69 to the pipe 60 may be controlled. In this case as well, the flow rate control based on the measurement result of the CO concentration may be performed in the same manner as in the flowchart shown in FIG.

  First, the CO removal system 131 can react CO and air at the fuel electrode 46 by supplying air to the fuel gas that has passed through the second CO removal catalyst 63 using the third air supply unit 69. , CO contained in the fuel gas can be removed. Thereby, it is possible to suppress the CO from remaining in the fuel electrode 46, and it is possible to suppress a reduction in the performance of the fuel electrode 46.

  Thereby, the CO removal system 131 can suitably remove CO contained in the fuel gas that has passed through the CO measurement unit 132. As described above, the CO measuring unit 132 can measure the CO concentration in a short time. For this reason, the CO removal system 131 can supply air when the fuel gas whose CO concentration is measured flows and reaches the third air supply unit 69. Thereby, necessary and sufficient air can be suitably supplied, and CO can be efficiently removed.

  Further, the CO removal system 131 adjusts the amount of air supplied from the third air supply unit 69 in accordance with the CO concentration contained in the fuel gas that has passed through the second CO removal catalyst 63, so that necessary and sufficient air is fueled. It can supply to gas and it can suppress that air and hydrogen in fuel gas react. Thereby, by supplying air, the amount of hydrogen reduction in the fuel gas can be reduced, and the reduction in power generation efficiency can be suppressed. That is, it is possible to efficiently generate power while suppressing a reduction in performance of the power generation system.

  The CO removal system 131 controls any one of the first air supply unit 66, the second air supply unit 68, the third air supply unit 69, the first temperature adjustment unit 70, and the second temperature adjustment unit 71. However, from the viewpoint of influence on the fuel electrode 46 and ease of control, the first air supply unit 66 and / or the second air supply unit 68, the third air supply unit 69, the temperature adjustment unit 70, and / or It is preferable to control in order of the second temperature adjustment unit 71.

  Next, another example of the CO removal system will be described with reference to FIG. Here, FIG. 9 is a block diagram showing a schematic configuration of another example of the CO removal system. The CO removal system 150 shown in FIG. 9 is the same as the CO removal system 22 shown in FIG. 2 except for the point that the CO measurement unit 152 is provided. Therefore, the same components as those of the CO removal system 22 are denoted by the same reference numerals, description thereof is omitted, and points unique to the CO removal system 150 will be described below.

  The CO removal system 150 shown in FIG. 9 includes a first CO removal catalyst 62, a second CO removal catalyst 63, a CO measurement unit 64, a first air supply unit 66, a second air supply unit 68, and a third air supply. Unit 69, first temperature adjustment unit 70, second temperature adjustment unit 71, and CO measurement unit (upstream CO measurement unit) 152. In addition, some functions of the control unit 154 also constitute the CO removal system 131 and control the operation of each unit of the CO removal system 150. The first CO removal catalyst 62, the second CO removal catalyst 63, the CO measurement unit 64, the first air supply unit 66, the second air supply unit 68, the third air supply unit 69, and the CO measurement unit 152. Is connected to the pipe 60. Each part of the CO removal system 22 has a CO measurement part 152, a first air supply part 66, a first CO removal catalyst 62, a CO measurement part 64, a second air supply part 68, and a second CO removal from upstream in the gas flow direction. The catalyst 63 and the third air supply unit 69 are arranged in this order. A fuel electrode 46 of the fuel cell 26 is connected to the downstream side of the third air supply unit 69 of the pipe 60. The CO measurement unit 152 has the same configuration as the CO measurement unit 64 of the CO removal system 22 shown in FIG.

  Based on the measurement result of the CO concentration in the CO measurement unit 152 in addition to the measurement result of the CO concentration in the CO measurement unit 64, the control unit 154 is one of the first air supply unit 66 and the first temperature adjustment unit 70. To control. That is, the control unit 154 controls the reaction environment in the first CO removal catalyst 62 based on the measurement result of the CO concentration in the CO measurement unit 152.

  In this way, the CO removal system 150 uses the control unit 154 to select one of the first air supply unit 66 and the first temperature adjustment unit 70 based on the measurement result of the CO concentration in the CO measurement unit 152, that is, the first temperature adjustment unit 70. By controlling the reaction environment in the 1CO removal catalyst 62, when the fuel gas measured by the CO measurement unit 132 passes through the first CO removal catalyst 62, an environment in which CO can be suitably removed can be obtained. That is, since the CO concentration can be measured before passing through the first CO removal catalyst 62, the reaction environment can be controlled according to the concentration. Thereby, CO contained in fuel gas can be reduced or removed more suitably. The CO removal system 150 controls the first air supply unit 66 and the first temperature adjustment unit 70 using the measurement result of the CO measurement unit 64 in addition to the measurement result of the CO concentration in the CO measurement unit 152. It may be. Further, the CO removal system 150 may use the measurement result of the CO measurement unit 64 for the control of the second air supply unit 68 and the second temperature adjustment unit 72.

  Next, another example of the power generation system will be described with reference to FIG. FIG. 10 is a block diagram showing a schematic configuration of another example of a power generation system having a CO removal system. The power generation system 200 includes a raw fuel supply unit 202, a fuel reforming system 204, an air supply unit 24, a valve 25, a fuel cell 26, a refrigerant supply unit 28, a heat dissipation unit 30, and a control unit 208. . The fuel reforming system 204 includes an evaporation unit 205, a reforming unit 206, and a CO removal system 22. Here, the CO removal system 22, the air supply unit 24, the valve 25, the fuel cell 26, the refrigerant supply unit 28, and the heat dissipation unit 30 have the same configuration as each unit of the power generation system 10 shown in FIG. 1. Since there is, explanation is omitted.

  The raw fuel supply unit 202 includes a tank 220 that stores liquid fuel, for example, methanol, a pump 224 that sucks liquid fuel from the tank 220, a pipe 226 that distributes the liquid fuel sucked from the tank 220 by the pump 224, and a pipe The valve 228 provided in the hole 226, the pipe 230 connecting the pipe 226 and the evaporation unit 205, the tank 240 storing water, the pump 244 for sucking water from the tank 240, and the pump 244 sucked from the tank 240. Water circulates and has a pipe 246 connected to the pipe 230 and a valve 248 provided in the pipe 246. The raw fuel supply unit 202 mixes the liquid fuel stored in the tank 220 and the water stored in the tank 240 through the pipe 230 and supplies the mixed fuel to the evaporation unit 205.

  The evaporation unit 205 gasifies the liquid fuel and water supplied from the raw fuel supply unit 202 by heating or the like. The reforming unit 206 performs a steam reforming reaction with liquid fuel and water to generate a hydrogen rich gas (fuel gas, reformed gas). The reforming unit 206 supplies the generated fuel gas to the CO removal system 22. The CO removal system 22 removes CO from the supplied fuel gas and then supplies the fuel gas to the fuel electrode 46. In addition, the gas discharged from the fuel electrode 46 is supplied to the evaporation unit 205, and unreacted combustion components contained in the gas are burned and used as a heating source for the evaporation unit 205.

  Even when the generation method of the fuel gas supplied to the CO removal system 22 is different as in the power generation system 200, the CO can be suitably removed by using the CO removal system 22. Also. In the present embodiment, the CO conversion unit is not provided, but CO can be suitably removed by the CO removal system 22. In the case of the power generation system 200, a CO conversion unit may be provided. Further, in the case of the power generation system 10 described above, a configuration in which the CO conversion unit is not provided may be employed.

  Here, the present invention is not limited to the above embodiment, and various forms can be adopted. For example, you may combine each embodiment. For example, the CO removal system shown in FIG. 8 and the CO removal system shown in FIG. 9 may be combined. That is, the CO measuring unit 64, 132, 152 may be provided in the CO removal system, and the CO concentration may be measured at three locations.

  Moreover, it is good also as a structure which does not provide a 2nd air supply part. Moreover, it is good also as a structure which does not provide a temperature control part. In addition, when the first air supply unit, the second air supply unit, and the temperature adjustment unit are provided, they are not controlled and controlled to be in a constant state regardless of the measurement result of the CO measurement unit. May be. Further, as in the CO removal system shown in FIGS. 2 and 9, when the CO measurement unit is not provided on the downstream side of the second CO removal catalyst, the third air supply unit may not be provided. Furthermore, the first air supply unit may supply air (oxygen) that reacts with both the first CO removal catalyst and the second CO removal catalyst.

  Further, the configuration of the CO measuring unit is not limited to the above configuration. For example, in the above embodiment, the entrance tube and the exit tube are provided on the same axis, but the present invention is not limited to this. For example, an optical mirror may be provided in the pipe, and the laser beam incident from the window of the incident tube may be multiple-reflected by the optical mirror in the measurement cell and then reach the window of the emission tube. In this manner, multiple reflections of the laser light can pass through more areas in the pipe. Thereby, the influence of the distribution of the concentration of the flowing gas flowing in the pipe (variation in the flow rate and density of the flowing gas and the variation in the concentration distribution in the flowing gas) can be reduced, and the concentration can be accurately detected. .

  In the above embodiment, the incident tube and the exit tube are directly provided in the pipe. However, the entrance tube and the exit tube are installed in a pipe having the same diameter as the pipe, and the tube is fitted into a part of the pipe. good. That is, a part of the sampling pipe may be cut, and a pipe provided with an incident pipe and an outgoing pipe may be fitted into the cut portion.

  Further, a branch pipe for collecting a part of the fuel gas flowing through the pipe may be provided, a measurement cell may be connected to the branch pipe, and the CO concentration contained in the fuel gas flowing through the measurement cell may be measured.

  Moreover, in the said embodiment, although the 1st air supply part and the 2nd air supply part supplied air, you may supply only oxygen. The first air supply unit and the second air supply unit may be air systems of different systems.

  As described above, the CO removal system and the CO removal method according to the present invention are useful for removing CO contained in the fuel gas supplied to the fuel electrode of the fuel cell.

DESCRIPTION OF SYMBOLS 10 Power generation system 12 Raw fuel supply part 14 Desulfurization part 16 Fuel reforming system 17 Fuel reforming part 18 Water vapor supply part 20 CO shift part 22 CO removal system 24 Air supply part 25 Valve 26 Fuel cell 28 Refrigerant supply part 30 Heat radiation part 32 Control unit 44 Fuel reforming catalyst unit 45 Reformer burner 46 Fuel electrode 48 Air electrode 50 Cooling unit 60, 72, 76, 80 Pipe 62 First CO removal catalyst 63 Second CO removal catalyst 64 CO measurement unit 66 First air supply unit 68 Second air supply unit 69 Third air supply unit 70 First temperature adjustment unit 71 Second temperature adjustment unit 74, 78, 82 Valve 84, 88 Temperature adjustment mechanism 86, 90 Temperature control unit 102 Measurement unit 104 Measurement means body 112 Incident tube 114 Emission tube 116, 118 Window 120 Optical fiber 122 Incident part 124 Receiving part 12 Emitting portion 128 source driver 130 calculator

Claims (18)

A CO removal system provided in a fuel supply path for supplying fuel gas to a fuel electrode of a fuel cell,
First air supply means for supplying air to the fuel supply path;
In the flow direction of the fuel gas, the fuel gas is disposed in the fuel supply path on the downstream side of the first air supply means, and CO and oxygen contained in the fuel gas are reacted to remove CO contained in the fuel gas. A first CO removal catalyst,
A measuring means that is disposed in the fuel supply path downstream of the first CO removal catalyst in the flow direction of the fuel gas, and measures the concentration of CO contained in the fuel gas that has passed through the first CO removal catalyst;
2nd CO which is arrange | positioned in the said fuel supply path downstream of the said measurement means in the flow direction of the said fuel gas, makes CO and oxygen contained in the said fuel gas react, and removes CO contained in a fuel gas A removal catalyst;
Control means for controlling at least one of the reaction environment of the first CO removal catalyst and the reaction environment of the second CO removal catalyst based on the CO concentration measured by the measurement means;
Upstream temperature adjusting means for adjusting the temperature of the first CO removal catalyst,
The control means controls the upstream temperature adjusting means based on the CO concentration, controls the reaction temperature of the first CO removal catalyst,
The measuring means includes
A light-emitting unit that includes the CO absorption wavelength and outputs laser light in the near-infrared wavelength region; and
An optical system for injecting laser light into the fuel supply path;
A light receiving unit that receives laser light incident from the light emitting unit and passed through the fuel supply path;
A calculation unit that calculates the CO concentration of the fuel gas flowing through the fuel supply path based on the intensity of the laser light output from the light emitting unit and the intensity of the laser light received by the light receiving unit ;
The second CO removal catalyst has a removal rate peak temperature that is higher than a peak removal rate peak of the first CO removal catalyst .   The control means adjusts the amount of air supplied to the fuel supply path by the first air supply means based on the CO concentration measured by the measurement means, and determines the amount of air supplied to the first CO removal catalyst. The CO removal system according to claim 1, wherein the CO removal system is controlled. An upstream side measuring unit that is disposed in the fuel supply path upstream of the first CO removal catalyst in the flow direction of the fuel gas and measures the concentration of CO contained in the fuel gas before passing through the first CO removal catalyst; And further,
The control means controls the reaction environment of the first CO removal catalyst based on the CO concentration measured by the upstream side measurement means,
The upstream measuring means includes
A light-emitting unit that includes the CO absorption wavelength and outputs laser light in the near-infrared wavelength region; and
An optical system for injecting laser light into the fuel supply path;
A light receiving unit that receives laser light incident from the light emitting unit and passed through the fuel supply path;
A calculation unit that calculates the CO concentration of the fuel gas flowing through the fuel supply path based on the intensity of the laser beam output from the light emitting unit and the intensity of the laser beam received by the light receiving unit. The CO removal system according to claim 1 or 2, characterized in that   The control means adjusts the amount of air supplied by the first air supply means to the fuel supply path based on the CO concentration measured by the upstream side measurement means, and supplies the air supplied to the first CO removal catalyst. The CO removal system according to claim 3, wherein the amount is controlled. Further comprising upstream temperature adjusting means for adjusting the temperature of the first CO removal catalyst;
The control means controls the upstream temperature adjusting means based on the CO concentration measured by the upstream measuring means to control the reaction temperature of the first CO removal catalyst. CO removal system described in 1. A CO removal system provided in a fuel supply path for supplying fuel gas to a fuel electrode of a fuel cell,
First air supply means for supplying air to the fuel supply path;
In the flow direction of the fuel gas, the fuel gas is disposed in the fuel supply path on the downstream side of the first air supply means, and CO and oxygen contained in the fuel gas are reacted to remove CO contained in the fuel gas. A first CO removal catalyst,
A measuring means that is disposed in the fuel supply path downstream of the first CO removal catalyst in the flow direction of the fuel gas, and measures the concentration of CO contained in the fuel gas that has passed through the first CO removal catalyst;
2nd CO which is arrange | positioned in the said fuel supply path downstream of the said measurement means in the flow direction of the said fuel gas, makes CO and oxygen contained in the said fuel gas react, and removes CO contained in a fuel gas A removal catalyst;
Control means for controlling at least one of the reaction environment of the first CO removal catalyst and the reaction environment of the second CO removal catalyst based on the CO concentration measured by the measurement means;
An upstream measuring means that is disposed in the fuel supply path upstream of the first CO removal catalyst in the flow direction of the fuel gas and measures the CO concentration contained in the fuel gas before passing through the first CO removal catalyst; ,
Upstream temperature adjusting means for adjusting the temperature of the first CO removal catalyst,
The control means controls the upstream temperature adjusting means based on the CO concentration measured by the upstream measuring means, and controls the reaction temperature of the first CO removal catalyst,
The measuring means includes
A light-emitting unit that includes the CO absorption wavelength and outputs laser light in the near-infrared wavelength region; and
An optical system for injecting laser light into the fuel supply path;
A light receiving unit that receives laser light incident from the light emitting unit and passed through the fuel supply path;
A calculation unit that calculates the CO concentration of the fuel gas flowing through the fuel supply path based on the intensity of the laser light output from the light emitting unit and the intensity of the laser light received by the light receiving unit;
The upstream measuring means includes
A light-emitting unit that includes the CO absorption wavelength and outputs laser light in the near-infrared wavelength region; and
An optical system for injecting laser light into the fuel supply path;
A light receiving unit that receives laser light incident from the light emitting unit and passed through the fuel supply path;
A calculation unit that calculates the CO concentration of the fuel gas flowing through the fuel supply path based on the intensity of the laser light output from the light emitting unit and the intensity of the laser light received by the light receiving unit;
Wherein said 2CO removal catalyst, CO removal system the temperature of the peak of the removal rate is characterized by high temperatures der Rukoto than the peak removal rate of the first 1CO removal catalyst. A downstream side measurement unit that is disposed in the fuel supply path downstream of the second CO removal catalyst in the flow direction of the fuel gas and that measures the CO concentration contained in the fuel gas that has passed through the second CO removal catalyst; Have
The downstream measuring means includes
A light-emitting unit that includes the CO absorption wavelength and outputs laser light in the near-infrared wavelength region; and
An optical system for injecting laser light into the fuel supply path;
A light receiving unit that receives laser light incident from the light emitting unit and passed through the fuel supply path;
A calculation unit that calculates the CO concentration of the fuel gas flowing through the fuel supply path based on the intensity of the laser beam output from the light emitting unit and the intensity of the laser beam received by the light receiving unit. The CO removal system according to any one of claims 1 to 6, characterized in that   8. The CO removal system according to claim 7, wherein the control means controls the reaction environment of the second CO removal catalyst based on the CO concentration measured by the downstream measurement means. A second air supply means disposed on the downstream side of the CO measurement unit and on the upstream side of the second CO removal catalyst in the fuel gas flow direction, for supplying air to the fuel supply path;
The control means adjusts the amount of air supplied by the second air supply means to the fuel supply path based on the CO concentration measured by the downstream measurement means, and supplies the air supplied to the second CO removal catalyst. 9. The CO removal system according to claim 8, wherein the amount is controlled.   The control means adjusts the amount of air supplied to the fuel supply path by the second air supply means based on the CO concentration measured by the measurement means, and determines the amount of air supplied to the second CO removal catalyst. The CO removal system according to claim 9, wherein the CO removal system is controlled. Further comprising downstream temperature adjusting means for adjusting the temperature of the second CO removal catalyst,
The control means controls the downstream temperature adjusting means based on the CO concentration measured by the downstream measuring means to control the reaction temperature of the second CO removal catalyst. The CO removal system according to any one of the above.   12. The CO according to claim 11, wherein the control unit controls the downstream temperature adjusting unit based on the CO concentration measured by the measuring unit to control a reaction temperature of the second CO removal catalyst. Removal system. A CO removal system provided in a fuel supply path for supplying fuel gas to a fuel electrode of a fuel cell,
First air supply means for supplying air to the fuel supply path;
In the flow direction of the fuel gas, the fuel gas is disposed in the fuel supply path on the downstream side of the first air supply means, and CO and oxygen contained in the fuel gas are reacted to remove CO contained in the fuel gas. A first CO removal catalyst,
A measuring means that is disposed in the fuel supply path downstream of the first CO removal catalyst in the flow direction of the fuel gas, and measures the concentration of CO contained in the fuel gas that has passed through the first CO removal catalyst;
2nd CO which is arrange | positioned in the said fuel supply path downstream of the said measurement means in the flow direction of the said fuel gas, makes CO and oxygen contained in the said fuel gas react, and removes CO contained in a fuel gas A removal catalyst;
Control means for controlling at least one of the reaction environment of the first CO removal catalyst and the reaction environment of the second CO removal catalyst based on the CO concentration measured by the measurement means;
A downstream side measurement unit that is disposed in the fuel supply path downstream of the second CO removal catalyst in the flow direction of the fuel gas, and measures the CO concentration contained in the fuel gas that has passed through the second CO removal catalyst;
Downstream temperature adjusting means for adjusting the temperature of the second CO removal catalyst,
The control means controls the downstream temperature adjusting means based on the CO concentration measured by the downstream measuring means, and controls the reaction temperature of the second CO removal catalyst,
The measuring means includes
A light-emitting unit that includes the CO absorption wavelength and outputs laser light in the near-infrared wavelength region; and
An optical system for injecting laser light into the fuel supply path;
A light receiving unit that receives laser light incident from the light emitting unit and passed through the fuel supply path;
A calculation unit that calculates the CO concentration of the fuel gas flowing through the fuel supply path based on the intensity of the laser light output from the light emitting unit and the intensity of the laser light received by the light receiving unit;
The downstream measuring means includes
A light-emitting unit that includes the CO absorption wavelength and outputs laser light in the near-infrared wavelength region; and
An optical system for injecting laser light into the fuel supply path;
A light receiving unit that receives laser light incident from the light emitting unit and passed through the fuel supply path;
A calculation unit that calculates the CO concentration of the fuel gas flowing through the fuel supply path based on the intensity of the laser light output from the light emitting unit and the intensity of the laser light received by the light receiving unit;
Wherein said 2CO removal catalyst, CO removal system the temperature of the peak of the removal rate is characterized by high temperatures der Rukoto than the peak removal rate of the first 1CO removal catalyst. A downstream air supply means disposed in the fuel supply path on the downstream side of the second CO removal catalyst in the fuel gas flow direction and supplying air to the fuel supply path;
The control means controls the amount of air supplied to the fuel electrode by adjusting the amount of air supplied by the downstream air supply means to the fuel supply path based on the CO concentration measured by the downstream measurement means. The CO removal system according to any one of claims 7 to 13, characterized in that: A second air supply means disposed on the downstream side of the CO measurement unit and on the upstream side of the second CO removal catalyst in the fuel gas flow direction, for supplying air to the fuel supply path;
The control means adjusts the amount of air supplied to the fuel supply path by the second air supply means based on the CO concentration measured by the measurement means, and determines the amount of air supplied to the second CO removal catalyst. It controls, The CO removal system of any one of Claim 1 to 8 characterized by the above-mentioned. Further comprising downstream temperature adjusting means for adjusting the temperature of the second CO removal catalyst,
16. The control unit according to claim 1, wherein the control unit controls the downstream temperature adjusting unit based on the CO concentration measured by the measuring unit to control a reaction temperature of the second CO removal catalyst. The CO removal system according to claim 1. A CO removal system provided in a fuel supply path for supplying fuel gas to a fuel electrode of a fuel cell,
First air supply means for supplying air to the fuel supply path;
In the flow direction of the fuel gas, the fuel gas is disposed in the fuel supply path on the downstream side of the first air supply means, and CO and oxygen contained in the fuel gas are reacted to remove CO contained in the fuel gas. A first CO removal catalyst,
A measuring means that is disposed in the fuel supply path downstream of the first CO removal catalyst in the flow direction of the fuel gas, and measures the concentration of CO contained in the fuel gas that has passed through the first CO removal catalyst;
2nd CO which is arrange | positioned in the said fuel supply path downstream of the said measurement means in the flow direction of the said fuel gas, makes CO and oxygen contained in the said fuel gas react, and removes CO contained in a fuel gas A removal catalyst;
Control means for controlling at least one of the reaction environment of the first CO removal catalyst and the reaction environment of the second CO removal catalyst based on the CO concentration measured by the measurement means;
Downstream temperature adjusting means for adjusting the temperature of the second CO removal catalyst,
The control means controls the downstream temperature adjusting means based on the CO concentration measured by the measuring means, controls the reaction temperature of the second CO removal catalyst,
The measuring means includes
A light-emitting unit that includes the CO absorption wavelength and outputs laser light in the near-infrared wavelength region; and
An optical system for injecting laser light into the fuel supply path;
A light receiving unit that receives laser light incident from the light emitting unit and passed through the fuel supply path;
A calculation unit that calculates the CO concentration of the fuel gas flowing through the fuel supply path based on the intensity of the laser light output from the light emitting unit and the intensity of the laser light received by the light receiving unit;
Wherein said 2CO removal catalyst, CO removal system the temperature of the peak of the removal rate is characterized by high temperatures der Rukoto than the peak removal rate of the first 1CO removal catalyst. A CO removal method for removing CO from fuel gas flowing through a pipe,
Of the fuel gas flowing through the pipe, a laser having a CO absorption wavelength and a near-infrared wavelength region with respect to the fuel gas that has passed through the first CO removal catalyst and has not passed through the second CO removal catalyst. Included in the fuel gas based on the intensity of the output laser light and the intensity of the laser light received by the light receiving unit, receiving the laser light that has passed through the pipe through which the fuel gas flows. A concentration measurement step for measuring the CO concentration as a measurement value;
A control step of controlling the temperature of at least one of the first CO removal catalyst and the second CO removal catalyst that react and remove air and CO based on the CO concentration measured in the concentration measurement step;
The second CO removal catalyst has a removal rate peak temperature that is higher than a peak removal rate peak of the first CO removal catalyst .

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