JP2009224065A - Starting method of fuel cell power generation device, and fuel cell power generation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a starting method of a fuel cell power generation device, capable of recovering condensed water with a small amount of soot mixed therein in simple constitution, and to provide the fuel cell power generation device. <P>SOLUTION: The fuel cell power generation device includes a reformer 3, having a reforming catalyst layer 3a and a combustion part 3b, a fuel cell body 1, a combustion fuel line L12, a combustion air line L11, a gas-liquid separator 20, a combustion exhaust gas line L13 connecting the combustion part 3b and the gas-liquid separator 20, a water tank 4, a condensed water line L14 for introducing condensed water in the gas-liquid separator 20 and combustion exhaust gas after gas liquid separation into the water tank, and a drain line L15a draining condensed water in the gas-liquid separator 20 to the outside of a system. The gas-liquid separator 20 drains the condensed water, produced from combustion exhaust gas exhausted after the starting of combustion in the combustion part 3b from the drain line L15a to the outside of the system, and then stores the condensed water recovered by the gas-liquid separator 20 in the water tank 4 from the condensed water line L14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for starting a fuel cell power generation device and a fuel cell power generation device that collects condensed water containing less soot and the like and reduces the load on the water treatment device.

  Fuel cell exhaust gas discharged from the fuel cell main body and combustion exhaust gas discharged from the combustion section of the reformer contain moisture, and water self-sustained within the system of the fuel cell power generation device (accepts supplementary water from outside) In order to maintain a state in which the operation is continued without any trouble, it is generally performed to collect condensed water from fuel cell exhaust gas or combustion exhaust gas and reuse it.

  However, when the fuel cell power generator is started, the combustion state in the combustion section is not stable, and ignition and misfire are likely to be repeated, so that the combustion fuel may not be completely burned. For this reason, soot etc. may be contained in the combustion exhaust gas discharged | emitted from a combustion part, and impurities, such as soot, may have mixed in the condensed water collect | recovered from combustion exhaust gas.

In reducing the amount of soot and the like mixed in the condensed water, for example, in Patent Document 1 below, when the combustion section is burning hydrocarbon-based combustion fuel, the combustion exhaust gas is discharged out of the system. It is disclosed.
JP 2007-188842 A

  In the above-mentioned Patent Document 1, when the combustion section is burning hydrocarbon-based combustion fuel, the entire amount of combustion exhaust gas is discharged out of the system, so it is necessary to provide an exhaust gas path and an exhaust port separately, There was a problem that the configuration was complicated. In addition, since the flow rate of the combustion exhaust gas is relatively large, it is necessary to install a pipe having a relatively large diameter as the exhaust gas path, which not only increases the cost of the apparatus but also increases the size of the entire apparatus.

  Accordingly, an object of the present invention is to provide a method for starting a fuel cell power generator and a fuel cell power generator capable of efficiently collecting condensed water with little soot contamination with a simple device configuration.

In order to achieve the above object, a method for starting a fuel cell power generator according to the present invention includes a reforming catalyst layer that steam-reforms a raw fuel containing hydrocarbons to generate a hydrogen-containing gas, and a reaction heat in the reforming catalyst layer. And a fuel cell main body that generates power by reaction with the hydrogen-containing gas and the oxidant gas, and supplies combustion fuel and combustion air to the combustion unit. A method for starting a fuel cell power generation device configured to generate the reaction heat, gas-liquid separation of combustion exhaust gas discharged from the combustion section to collect condensed water, and reuse the condensed water ,
After starting combustion in the combustion section, a condensed water discharge step for draining condensed water generated from combustion exhaust gas to the outside of the system,
After the condensed water draining step, recovery of condensed water generated from the combustion exhaust gas is started.

  In the starting method of the fuel cell power generation device of the present invention, the condensed water generated from the combustion exhaust gas discharged from the combustion section after the start of combustion in the combustion section is drained out of the system. Since condensed water generated from combustion exhaust gas containing a large amount of fuel, soot and the like can be drained out of the system, the collected condensed water is less contaminated with soot and the like. For this reason, the replacement period of the filter used for removing soot and the like can be extended. Furthermore, it is possible to suppress an increase in pressure loss and a load applied to a subsequent water treatment apparatus. In addition, since condensed water is less discharged than combustion exhaust gas, the diameter of the pipe used for discharging condensed water can be reduced, and the apparatus configuration can be simplified.

  In the start-up method of the fuel cell power generator according to the present invention, it is preferable to carry out the condensed water discharge step at least until it is detected that the combustion state of the combustion section is stable. If the combustion state of the combustion part is unstable, it will be in a state where ignition and misfire are repeated, so that the fuel for combustion tends to be incompletely combusted and soot and the like are likely to be mixed in the combustion exhaust gas. For this reason, the condensed water discharge step is carried out at least until it is detected that the combustion state of the combustion section is stable, so that the condensed water with a very small amount of contamination such as soot is efficiently recovered from the combustion exhaust gas. it can.

  In the start-up method of the fuel cell power generator according to the present invention, it is preferable that the condensed water discharge step is performed while the raw fuel is supplied as the combustion fuel.

  In the method for starting the fuel cell power generator according to the present invention, it is preferable that the condensate draining step is performed until a predetermined time has elapsed since the start of starting the fuel cell power generator.

  According to each aspect described above, condensed water with a very small amount of soot and the like can be efficiently recovered from the combustion exhaust gas.

  The start-up method of the fuel cell power generator according to the present invention includes the condensate discharge step while the pressure fluctuation range of one or more gases selected from combustion fuel, combustion air, and combustion exhaust gas exceeds a set value. It is preferable to implement. If the combustion state of the combustion section is unstable, the pressure of the gas will not be stable, so while the pressure fluctuation range of the gas exceeds the set value, draining the condensed water outside the system, etc. Condensate with very little mixing can be efficiently recovered.

  The start-up method of the fuel cell power generator of the present invention is the condensate draining step while the flow rate fluctuation range of one or more gases selected from combustion fuel, combustion air and combustion exhaust gas exceeds a set value. It is preferable to implement. If the combustion state of the combustion section is unstable, the flow rate of the gas will not be stable, so while the flow rate fluctuation range of the gas exceeds the set value, draining the condensed water outside the system, etc. Condensate with very little mixing can be efficiently recovered.

  In the start-up method of the fuel cell power generator according to the present invention, it is preferable that the condensed water discharge step is performed while the temperature fluctuation range of the combustion section exceeds a set value. If the combustion state of the combustion section is unstable, the combustion section will not be stable, so while the temperature fluctuation range of the combustion section exceeds the set value, condensate is drained outside the system, so Condensed water with very little can be efficiently recovered.

  In the start-up method of the fuel cell power generator according to the present invention, it is preferable that the condensed water discharge step is performed while the temperature rise rate of the combustion section is lower than a set value. If the combustion state of the combustion part is unstable, the temperature rise rate of the combustion part is slow, so while the temperature fluctuation range of the combustion part is below the set value, draining condensed water outside the system, Condensate with very little coexistence can be recovered efficiently.

  In the start-up method of the fuel cell power generator according to the present invention, it is preferable that the condensed water discharge step is performed while the value detected by the particle counter of the combustion exhaust gas exceeds a preset value. According to this aspect, since the amount of impurities such as soot contained in the combustion exhaust gas is directly detected by the particle counter, while the detection value by the particle counter exceeds a preset value, the condensed water is removed from the system. By draining, it is possible to efficiently collect condensed water with very little mixture of soot and the like.

On the other hand, the fuel cell power generator of the present invention is
A reforming catalyst layer that steam-reforms a raw fuel containing hydrocarbons to generate a hydrogen-containing gas, and a reforming device having a combustion section that supplies reaction heat to the reforming catalyst layer;
A fuel cell body that generates power by reaction with the hydrogen-containing gas and the oxidant gas;
A combustion fuel line for supplying combustion fuel to the combustion section;
A combustion air line for supplying combustion air to the combustion section;
A gas-liquid separator that gas-liquid separates the flue gas discharged from the combustion section and collects condensed water; and
A combustion exhaust gas line connecting the combustion section and the gas-liquid separator;
A decarboxylation device;
A condensed water line for introducing condensed water in the gas-liquid separator and combustion exhaust gas after gas-liquid separation into the decarbonation device;
A water tank for storing condensed water decarboxylated by the decarboxylation device;
A drainage line for draining the condensed water in the gas-liquid separator to the outside of the system,
When starting the fuel cell power generator, the condensed water generated from the combustion exhaust gas discharged after the start of combustion in the combustion section is drained out of the system from the drainage line, and then the condensation generated from the combustion exhaust gas Configured to supply water from the condensed water line to the decarbonator;
It is characterized by that.

Another aspect of the fuel cell power generator of the present invention is
A reforming catalyst layer that steam-reforms a raw fuel containing hydrocarbons to generate a hydrogen-containing gas, and a reforming device having a combustion section that supplies reaction heat to the reforming catalyst layer;
A fuel cell body that generates power by reaction with the hydrogen-containing gas and the oxidant gas;
A combustion fuel line for supplying combustion fuel to the combustion section;
A combustion air line for supplying combustion air to the combustion section;
A decarboxylation device;
A combustion exhaust gas line for guiding the combustion exhaust gas discharged from the combustion section to the decarbonation device;
A water tank for storing condensed water decarboxylated by the decarboxylation device;
A heat exchanger provided on the combustion exhaust gas line for cooling the combustion exhaust gas;
A drain trap connected to a downstream side of the heat exchanger on the combustion exhaust gas line via a valve, and separating condensed water from the combustion exhaust gas;
A drainage line for draining the condensed water in the drain trap to the outside of the system,
At the start of the fuel cell power generation device, the condensed water generated from the combustion exhaust gas discharged after the start of combustion in the combustion section is drained out of the system by opening the valve, and then generated from the combustion exhaust gas. The condensed water is configured to be supplied to the decarboxylation device with the valve closed.
It is characterized by that.

  According to the fuel cell power generator of the present invention, the condensate generated from the combustion exhaust gas discharged after the start of combustion in the combustion section is drained out of the system from the drain line, Condensed water generated from combustion exhaust gas containing a large amount of fuel, soot and the like can be drained out of the system from the drainage line. For this reason, condensed water with little mixing of soot and the like can be collected in the water tank, and the replacement cycle of the filter used for removing soot and the like can be prolonged. Furthermore, it is possible to suppress an increase in pressure loss and a load applied to a subsequent water treatment apparatus. In addition, since the condensed water is less discharged than the combustion exhaust gas, the drainage line may be a pipe having a relatively small diameter, and the apparatus configuration can be simplified.

  The fuel cell power generator of the present invention is preferably configured to drain the condensed water out of the system from the drainage line at least until it is detected that the combustion state of the combustion section is stable.

  The fuel cell power generator of the present invention is preferably configured to drain the condensed water out of the system from the drain line while using the raw fuel as a combustion fuel.

  The fuel cell power generator of the present invention is preferably configured to drain the condensed water out of the system from the drain line until a predetermined time has elapsed since the start of the fuel cell power generator.

  In the fuel cell power generator according to the present invention, a pressure gauge is disposed at least one of the combustion fuel line, the combustion air line, and the combustion exhaust gas line, and a fluctuation range of a detection value of the pressure gauge is previously set. While the set value is exceeded, the condensed water is preferably drained out of the system from the drainage line.

  In the fuel cell power generator according to the present invention, a flow meter is arranged at least one of the combustion fuel line, the combustion air line, and the combustion exhaust gas line, and a fluctuation range of a detection value of the flow meter is set in advance. While the set value is exceeded, the condensed water is preferably drained out of the system from the drainage line.

  In the fuel cell power generator according to the present invention, a thermometer is disposed in the combustion section, and a fluctuation range of detection of the thermometer exceeds a preset value and / or a preset temperature increase It is preferable that the condensed water is drained out of the system from the drainage line while the speed is lower.

  In the fuel cell power generator according to the present invention, a particle counter is disposed in the combustion exhaust gas line, and the condensed water is drained out of the system from the drain line while the detection value of the particle counter exceeds a set value. It is preferable that it is comprised.

  According to each aspect described above, condensed water with very little mixture of soot and the like can be efficiently collected in the water tank.

  According to the present invention, the condensed water generated from the combustion exhaust gas discharged from the combustion section after the start of combustion in the combustion section is drained out of the system, so that a large amount of unburned combustion fuel, soot, etc. The condensed water generated from the combustion exhaust gas contained in can be drained out of the system, and the collected condensed water is less contaminated with soot and the like. For this reason, the replacement period of the filter used for removing soot and the like can be extended. Furthermore, it is possible to suppress an increase in pressure loss and a load applied to a subsequent water treatment apparatus. In addition, since condensed water is less discharged than combustion exhaust gas, the diameter of the pipe used for discharging condensed water can be reduced, and the apparatus configuration can be simplified.

  Hereinafter, embodiments of a fuel cell power generator according to the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration diagram of a first embodiment showing a basic configuration of a fuel cell power generator of the present invention.

  In the figure, reference numeral 1 denotes a fuel cell body, which is a cooling system 1d having an anode electrode 1a and a cathode electrode 1b sandwiching an electrolyte 1c, and a cooling pipe disposed each time a plurality of unit cells made of these are stacked. It consists of and.

A reformed gas supply line L1 extending from the reformer 3 is connected to the reformed gas supply side of the anode electrode 1a. The reformed gas supply line L1 is provided with a reformed gas drain trap Q1, and the reformed gas condensate water supply line L2 extends from the condensate storage part of the reformed gas drain trap Q1 to decarboxylate. It is connected to the device 5.
An anode off-gas discharge line L3 extends from the anode off-gas discharge side of the anode electrode 1a, and the tip side thereof is connected to the combustion fuel supply line L12. Further, an anode offgas drain trap Q2 is disposed in the middle of the anode offgas discharge line L3, and the anode offgas condensed water supply line L4 extends from the condensate storage part of the anode offgas drain trap Q2. 5 is connected.

An air supply line L5 extending from an air supply source is connected to the air supply side of the cathode electrode 1b. The humidifier 2 is disposed in the air supply line L5.
A cathode offgas discharge line L6 extends from the cathode air discharge side of the cathode electrode 1b and is connected to the water tank 4. A cathode offgas heat exchanger Q3 is disposed in the cathode offgas discharge line L6.

A battery coolant supply line L7 extending from the battery coolant tank 12 is connected to the coolant supply side of the cooling system 1d.
A battery cooling water discharge line L8 extends from the cooling water discharge side of the cooling system 1d and is connected to the battery cooling water tank 12.

  The reformer 3 includes a reforming catalyst layer 3a filled with a steam reforming catalyst and a combustion section 3b in which a burner is disposed, and combustion heat and combustion exhaust gas generated when combustion fuel is burned by the burner. Thus, the reforming catalyst layer 3a is heated.

A raw material supply line L9 extending from the raw fuel source and a reforming water supply line L10 extending from the battery cooling water tank 12 are connected to the reforming raw material input side of the reforming catalyst layer 3a.
From the reformed gas discharge side of the reformed catalyst layer 3a, the reformed gas supply line L1 extends and is connected to the anode electrode 1a.

A combustion fuel supply line L12 and a combustion air supply line L11 are connected to the combustion fuel inlet side of the combustion section 3b, and fuel fuel and combustion air are supplied to a burner disposed in the combustion section 3b. It is configured so that it can be supplied. The anode offgas discharge line L3 and the raw fuel supply line L9 are connected to the upstream side of the combustion fuel supply line L12.
A combustion exhaust gas line L13 extends from the combustion exhaust gas exhaust side of the combustion unit 3b and is connected to the gas-liquid separator 20.

  A combustion exhaust gas heat exchanger Q4 is provided on the combustion exhaust gas line L13 to recover the heat of the combustion exhaust gas and to condense moisture in the combustion exhaust gas.

  The gas-liquid separator 20 is not particularly limited as long as it is a device that separates combustion exhaust gas into gas and condensed water, and a conventionally known one can be used.

  A separation gas discharge line L 14 extends from the gas phase portion of the gas-liquid separator 20 and is connected to the decarbonation device 5. The “separated gas discharge line L14” is the “condensate water line” in the present invention. A combustion exhaust gas condensate recovery line L15b described later is connected to the separation gas discharge line L14.

  Further, a combustion exhaust gas condensed water take-out line L15 extends from the condensed water storage part of the gas-liquid separator 20. The tip of this flue gas condensed water take-out line L15 is branched and connected to a drain line L15a in which a drain valve V1 is interposed and a flue gas condensed water recovery line L15b in which an on-off valve V2 is interposed.

  The decarbonation device 5 is disposed adjacent to the upper portion of the water tank 4 and communicates via the drain port 6. The above-described reformed gas condensate supply line L2, the anode off-gas condensate supply line L4, and the separation gas discharge line L14 are connected to the upper portion of the decarboxylation device 5. Further, an exhaust line L17 extends from the decarboxylation device 5.

  The decarbonation device 5 is not particularly limited, and a device that can degas by condensing condensed water and decarbonation air to diffuse carbon dioxide in the condensed water in the air can be preferably used. The deaeration device having such a configuration includes a deaeration part filled with a SUSCH ring or the like, supplies condensed water to the upper part of the deaeration part, and supplies decarbonation air from the lower part of the deaeration part. Supplying and condensing water by gravity falling, contacting with decarbonation air and decarboxylation treatment, for example, a porous material as disclosed in JP-A-2007-323969 The degassing part in which the inclined plate is arranged is provided, decarbonation air is circulated from the lower side of the inclined plate to the upper side, and condensed water is allowed to flow downward from the upper side of the inclined plate, An example of such a structure that decarboxylates the condensed water is given as an example.

  Connected to the water tank 4 are the cathode offgas discharge line L6 described above and the battery cooling water overflow line L18 extending from the battery cooling water tank 12. A tank water overflow line L19 extends on the side wall of the water tank 4 so that the water level in the tank does not exceed a certain level. A recovered water supply line L <b> 20 extends from the lower part of the water tank 4 and is connected to the battery cooling water tank 12. The recovered water supply line L20 is provided with a recovered water pump P1, an inlet filter 8, and a water treatment device 10 from the upstream side.

  The inlet filter 8 is not particularly limited as long as it removes impurities such as soot and dust contained in the recovered water collected in the water tank 4, and a metal removal filter, a particulate removal filter, and the like are preferable.

  The water treatment device 10 is not particularly limited as long as it is a device that deionizes the recovered water collected in the water tank 4, and examples thereof include an electric deionization device, a metal ion removal device, an activated carbon filter, and a water treatment resin. . These may be used alone or in combination. Among these, it is preferable to use an electric deionization device because the running cost and the maintenance cost can be reduced. A metal ion removing device is arranged upstream of the electric deionization device, and the downstream of the electric deionization device. More preferably, a water treatment resin is disposed on the side. In this embodiment, an electric deionizer is used as the water treatment device 10.

  Here, the electric deionization apparatus is an electrode, a demineralization chamber in which an ion exchange resin is filled in an interior partitioned by an ion exchange membrane, a concentration chamber that receives ions moving from the demineralization chamber, The ion that flows into the desalting chamber reacts with the ion exchange resin based on its affinity, concentration and ionic strength, moves through the resin in the direction of the potential gradient, and reaches the ion exchange membrane. Reach. The cations permeate the cation exchange membrane and the anions permeate the anion exchange membrane and move to the concentration chamber. As a result, the recovered water can be separated into deionized water and concentrated water, and deionized water with a reduced ion concentration can be recovered from the demineralization chamber of the electric deionization device. Can supply.

  On the other hand, the concentrated water discharged from the concentration chamber of the electric deionizer contains a large amount of ions in the recovered water, and in this embodiment, the concentrated water extended from the concentration chamber of the electric deionizer. The water discharge line L21 is connected to the decarbonation device 5 and configured to return the concentrated water to the upstream side of the water tank.

  Next, the operation of the fuel cell power generator including the method for starting the fuel cell power generator of the present invention will be described.

  First, in the reformer 3, the raw fuel supplied from the raw fuel supply line L9 is mixed with the reformed water supplied from the reformed water supply line L10 and supplied to the reforming catalyst layer 3a. A reforming gas rich in hydrogen is generated by the reforming reaction. Since the steam reforming reaction is an endothermic reaction, combustion fuel is supplied from the combustion fuel supply line L12 and combustion air from the combustion air supply line L11 to the combustion unit 3b of the reformer 3, and these are combusted. Then, the reforming catalyst layer 3a is heated. At the time of starting the fuel cell power generator, the raw fuel supplied from the raw fuel supply line L9 is used as the combustion fuel. When the combustion state in the combustion unit 3b is stabilized and the reforming catalyst layer 3a is sufficiently heated, the supply of the raw fuel to the combustion unit 3b is stopped, the anode off gas is supplied to the combustion unit 3b, and the anode off gas Is used as a fuel for combustion.

  The reformed gas generated by the reformer 3 is supplied to the anode electrode 1a through the reformed gas supply line L1. Condensed water contained in the reformed gas is recovered by the reformed gas drain trap Q1 disposed in the middle of the reformed gas supply line L1, and supplied to the decarbonation device 5 through the reformed gas condensed water supply line L2. Is done.

  In the fuel cell main body 1, the reformed gas supplied to the anode electrode 1a and the air supplied to the cathode electrode 1b are electrochemically reacted at the interface of the electrolyte 1c to generate power, and this generated output is supplied to the power system. .

  The cathode offgas discharged from the cathode electrode 1b is cooled by the cathode offgas heat exchanger Q3 and supplied to the water tank 4 through the cathode offgas discharge line L6 together with the cathode offgas condensed water and the cathode gas.

  The anode off gas discharged from the anode electrode 1a is supplied to the combustion unit 3b through the anode off gas discharge line L3 and used as a combustion fuel. The condensed water contained in the anode off gas is recovered by an anode off gas drain trap Q2 disposed in the middle of the anode off gas discharge line L3, and is supplied to the decarbonation device 5 through the anode off gas condensed water supply line L4.

  Further, the flue gas discharged from the combustion section 3b of the reformer 3 is subjected to gas-liquid separation processing by the gas-liquid separator 20 to collect condensed water. In the present invention, at the time of starting the fuel cell power generation device, A condensed water discharge step is performed for draining condensed water generated from the combustion exhaust gas discharged after the combustion start of the combustion unit 3b to the outside of the system, and is generated from the combustion exhaust gas discharged from the combustion unit 3b after the condensed water draining step. Recovery of condensed water will be started.

  In the condensed water discharge step, the on-off valve V2 is closed and the drain valve V1 is opened, and the condensed water accumulated in the condensed water storage part of the gas-liquid separator 20 is discharged out of the system from the drain line L15a.

  The condensed water discharge step is preferably performed at least until it is detected that the combustion state of the combustion unit 3b is stable. The combustion state is detected by measuring the pressure fluctuation range and flow rate fluctuation range of one or more gases selected from combustion fuel, combustion air and combustion exhaust gas, and measuring the temperature fluctuation range and temperature rise rate of the combustion part 3d. Alternatively, it can be performed by means such as detecting combustion exhaust gas with a particle counter.

  When the fuel cell power generator is started, a fuel mainly composed of raw fuel is used as a combustion fuel, and the combustion state of the combustion part 3b is unstable, and ignition and misfire are repeated. For this reason, the combustion fuel tends to be incompletely combusted, and the combustion exhaust gas discharged from the combustion unit 3b at the time of starting the fuel cell power generation apparatus has a large amount of soot and the like. However, as described above, by performing the condensed water discharge process at least until it is detected that the combustion state of the combustion section is stable, unburned combustion fuel is mixed in the combustion exhaust gas. Condensed water with very little contamination such as soot can be supplied to the water tank 4. The gas content of the combustion exhaust gas is separated by the gas-liquid separator 20, then sent to the decarbonation device 5 through the separation gas discharge line L 14, and from the exhaust line L 17 provided in the decarbonation device 5. Exhausted.

  Moreover, you may make it implement a condensed water discharge process, while supplying raw fuel as a fuel for combustion. The combustion exhaust gas discharged when the raw fuel is burned is likely to contain soot etc., so the condensate discharge process should be performed while the raw fuel is supplied as the fuel for combustion. By doing so, condensed water with a very small amount of contamination such as soot can be supplied to the water tank 4.

  In addition, the condensate draining process obtains in advance the time required for the combustion state of the combustion section to stabilize and the time required to stop the supply of raw fuel as a fuel for combustion. You may make it implement until the said time passes. According to this aspect, the condensate draining process is performed based on a preset time, so that operation control is facilitated.

  And after finishing the condensed water discharge process, the on-off valve V2 is opened and the drain valve V1 is closed. By doing in this way, the condensed water collected in the condensed water storage part of the gas-liquid separator 20 is sent to the separated gas discharge line L14 through the combustion exhaust gas condensed water recovery line L15b, and decarboxylated together with the gas content. Sent to the device 5. The condensed water is decarboxylated by the decarboxylation device 5 and then sent to the water tank 4, and the gas component is exhausted out of the system from the exhaust line L <b> 17 together with decarbonation air.

  The condensed water collected in the water tank 4 is subjected to removal of impurities such as soot and dust by the inlet filter 8 and then sent to the water treatment device 10 for deionization treatment. It is sent to the cooling water tank 12 and used for battery cooling water, humidified water, reformed water and the like. On the other hand, the concentrated water is refluxed to the decarboxylation device 5 through the concentrated water discharge line L21.

  As described above, according to the present invention, when the fuel cell power generator is started, the condensed water generated from the combustion exhaust gas discharged from the combustion unit 3b after the start of combustion in the combustion unit 3b is drained out of the system. Therefore, condensed water generated from unburned combustion fuel and combustion exhaust gas containing a large amount of soot can be drained out of the system, and impurities such as soot are mixed in the condensed water recovered in the water tank 4. It becomes difficult. As a result, the replacement cycle of the inlet filter 8 used for removing soot and the like can be extended. Furthermore, it is possible to suppress an increase in pressure loss and a load applied to the downstream water treatment apparatus 10 and the like, thereby reducing maintenance costs. Further, since condensed water is less discharged than combustion exhaust gas, the piping used for the drain line L15a can have a small diameter, and can be miniaturized. And since the gas component in the combustion exhaust gas can be exhausted out of the system together with the decarbonation air from the exhaust line L17 provided in the decarbonation device 5, it is not necessary to separately provide an exhaust port, and the device configuration can be simplified. .

  Next, in the first embodiment, a second embodiment using a pressure gauge as a means for detecting the combustion state of the combustion section 3b will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same location as 1st embodiment, and the description is abbreviate | omitted.

  In this embodiment, the difference from the first embodiment is that pressure gauges 51 to 53 are arranged in each of the combustion air supply line L11, the combustion fuel supply line L12, and the combustion exhaust gas discharge line L13. It is.

  In this embodiment, the opening / closing control of the drain valve V1 and the opening / closing valve V2 is performed based on the measured values of the pressure gauges 51-53.

  If the combustion state of the combustion part 3b is unstable, the pressure of the combustion fuel, combustion air and combustion exhaust gas will not be stable. Therefore, the combustion state of the combustion part 3b can be determined by using the fluctuation range of the pressure of the gas as a guideline. I can grasp it.

  This will be described below with reference to the flowchart shown in FIG.

  First, in step S1, combustion of combustion fuel is started in the combustion section 3b.

  Next, in step S2, the drain valve V1 is opened and the on-off valve V2 is closed. The combustion exhaust gas discharged from the combustion section 3b is gas-liquid separated by the gas-liquid separator 20, the condensed water is drained out of the system from the drain line L15a, and the gas component is decarboxylated through the separated gas discharge line L14. Introduced into the device 5.

  Next, in step S3, the measured values of the pressure gauges 51, 52, and 53 are detected, and the fluctuation range of the measured values of the pressure gauges 51, 52, and 53 is maintained within a predetermined range for a predetermined time or more. (In this embodiment, the fluctuation range is maintained for 20 seconds or more in a state within ± 20%). If the combustion state of the combustion part 3b is unstable, the pressures of the combustion fuel, combustion air, and combustion exhaust gas are not stable. Therefore, while the fluctuation range of the pressure of the gas exceeds the set value, the combustion part 3b It can be assumed that the combustion state is unstable. If the state cannot be maintained, the process returns to step S2. On the other hand, when the said state can be maintained, it moves to step S4 and terminates a condensed water drainage process temporarily.

  In step S4, the drain valve V1 is closed, the open / close valve V2 is opened, and the condensed water recovered by the gas-liquid separator 20 is introduced into the deaerator 5 through the combustion exhaust gas condensed water recovery line L15a and the separated gas discharge line L14. .

  Next, in step S5, the measured values of the pressure gauges 51, 52, 53 are detected, and the fluctuation range of the measured values of the pressure gauges 51, 52, 53 is within a predetermined range (± 20% in this embodiment). Or less). When the fluctuation range of the measured value is not within the predetermined range, the process returns to step S2. On the other hand, when the fluctuation range of the measured value is within the predetermined range, the process proceeds to step S6.

  In step S6, it is determined whether the temperature of the reforming catalyst layer 3a exceeds a predetermined temperature (540 ° C. or higher in this embodiment). When the temperature of the reforming catalyst layer 3a is lower than the predetermined temperature, the process returns to step S5, and when the temperature of the reforming catalyst layer 3a exceeds the predetermined temperature, the condensed water discharge process is terminated.

  Step S4 and step S5 may be omitted. Further, in this embodiment, the pressure gauges 51, 52, and 53 are disposed on the combustion air supply line L11, the combustion fuel supply line L12, and the combustion exhaust gas discharge line L13, respectively. It may be arranged in any of the lines described above.

  Next, in the first embodiment, a third embodiment using a flow meter as a means for detecting the combustion state of the combustion section 3b will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same location as 1st embodiment, and the description is abbreviate | omitted.

  In this embodiment, the difference from the first embodiment is that flow meters 61 to 63 are arranged in the combustion air supply line L11, the combustion fuel supply line L12, and the combustion exhaust gas discharge line L13, respectively. is there.

  In this embodiment, the opening / closing control of the drain valve V1 and the opening / closing valve V2 is performed based on the measured values of the flow meters 61-63.

  If the combustion state of the combustion unit 3b is unstable, the flow rates of the combustion fuel, combustion air, and combustion exhaust gas are not stable. Therefore, the combustion state of the combustion unit 3b is determined by using the fluctuation range of the gas flow rate as a guideline. I can grasp it.

  Hereinafter, a description will be given with reference to the flowchart shown in FIG.

  First, in step S11, combustion of combustion fuel is started in the combustion section 3b.

  Next, in step S12, the drain valve V1 is opened and the on-off valve V2 is closed. The combustion exhaust gas discharged from the combustion section 3b is gas-liquid separated by the gas-liquid separator 20, the condensed water is drained out of the system from the drain line L15a, and the gas component is decarboxylated through the separated gas discharge line L14. Introduced into the device 5.

  Next, in step S13, the measurement values of the flow meters 61, 62, 63 are detected, and the fluctuation range of any of the measurement values of the flow meters 61, 62, 63 is maintained within a predetermined range for a predetermined time or more. (In this embodiment, the fluctuation range is maintained for 20 seconds or more in a state within ± 20%). If the state cannot be maintained, the process returns to step S12. On the other hand, when the said state can be maintained, it moves to step S14 and terminates a condensed water drainage process temporarily.

  In step S14, the drain valve V1 is closed, the open / close valve V2 is opened, and the condensed water recovered by the gas-liquid separator 20 is introduced into the deaeration device 5 through the combustion exhaust gas condensate recovery line L15a and the separation gas discharge line L14. .

  Next, in step S15, the measured values of the flow meters 61, 62, and 63 are detected, and the fluctuation range of the measured values of the flow meters 61, 62, and 63 is within a predetermined range (± 20% in this embodiment). Or less). When the fluctuation range of the measured value is not within the predetermined range, the process returns to step S12. On the other hand, when the fluctuation range of the measured value is within the predetermined range, the process proceeds to step S16.

  In step S16, it is determined whether the temperature of the reforming catalyst layer 3a exceeds a predetermined temperature (in this embodiment, 540 ° C. or higher). When the temperature of the reforming catalyst layer 3a is lower than the predetermined temperature, the process returns to step S15, and when the temperature of the reforming catalyst layer 3a exceeds the predetermined temperature, the condensed water discharge step is terminated.

  Note that step S14 and step S15 may be omitted. In this embodiment, the flow meters 61, 62, and 63 are arranged on the combustion air supply line L11, the combustion fuel supply line L12, and the combustion exhaust gas discharge line L13, respectively. It may be arranged in any of the lines described above.

  Next, in the first embodiment, a fourth embodiment using a thermometer as a means for detecting the combustion state of the combustion section 3b will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same location as 1st embodiment, and the description is abbreviate | omitted.

  In this embodiment, the difference from the first embodiment is that a thermometer 71 is arranged in the combustion section 3b.

  In this embodiment, the opening / closing control of the drain valve V <b> 1 and the opening / closing valve V <b> 2 is performed based on the measured value of the thermometer 71.

  If the combustion state of the combustion unit 3b is unstable, the temperature of the combustion unit 3b is difficult to increase, and the temperature varies, so the temperature increase rate of the combustion unit 3b and the temperature fluctuation range of the combustion unit 3b are used as guidelines. By doing so, the combustion state of the combustion part 3b can be grasped | ascertained. The thermometer 71 is only required to be disposed at a position where the temperature of the combustion section 3b can be measured, and may be disposed on the inner wall of the burner chamber or on the flow path of the combustion exhaust gas discharged when the combustion fuel is burned by the burner. preferable.

  First, an example of controlling the opening and closing of the drain valve V1 and the on-off valve V2 using the temperature increase rate of the combustion unit 3b as a guide will be described with reference to the flowchart shown in FIG.

  In step S21, combustion of the combustion fuel is started in the combustion section 3b.

  Next, in step S22, the drain valve V1 is opened and the on-off valve V2 is closed. The combustion exhaust gas discharged from the combustion section 3b is gas-liquid separated by the gas-liquid separator 20, the condensed water is drained out of the system from the drain line L15a, and the gas component is decarboxylated through the separated gas discharge line L14. Introduced into the device 5.

  Next, in step S23, whether or not the temperature increase rate of the thermometer 71 has been maintained for a predetermined time or more in a state of exceeding a predetermined value (in this embodiment, (temperature increase value necessary for activation [for example, 600 ° C. ] / Set start time [e.g. 120 minutes]) at a temperature increase rate of 1/3 or more, and is maintained for 5 minutes or more. If the state cannot be maintained, the process returns to step S22. On the other hand, when the said state can be maintained, it moves to step S24 and terminates a condensed water drainage process temporarily.

  In step S24, the drain valve V1 is closed, the on-off valve V2 is opened, and the condensed water recovered by the gas-liquid separator 20 is introduced into the deaeration device 5 through the combustion exhaust gas condensate recovery line L15a and the separation gas discharge line L14. .

  Next, in step S25, whether or not the temperature increase rate of the thermometer 71 exceeds a predetermined value (in this embodiment, (temperature increase value necessary for activation [eg 600 ° C.] / Set activation time [eg 120 Min))) or more. When the fluctuation range of the measured value is not within the predetermined range, the process returns to step S22. On the other hand, when the fluctuation range of the measured value is within the predetermined range, the process proceeds to step S26.

  In step S26, it is determined whether the temperature of the reforming catalyst layer 3a exceeds a predetermined temperature (540 ° C. or higher in this embodiment). When the temperature of the reforming catalyst layer 3a is lower than the predetermined temperature, the process returns to step S25, and when the temperature of the reforming catalyst layer 3a exceeds the predetermined temperature, the condensed water discharge process is terminated.

  Note that step S24 and step S25 may be omitted.

  Next, an example in which the opening / closing control of the drain valve V1 and the opening / closing valve V2 is controlled using the temperature fluctuation range of the combustion section 3b as a guide will be described with reference to the flowchart shown in FIG.

  In step S31, combustion of the combustion fuel is started in the combustion section 3b.

  Next, in step S32, the drain valve V1 is opened and the on-off valve V2 is closed. The combustion exhaust gas discharged from the combustion section 3b is gas-liquid separated by the gas-liquid separator 20, the condensed water is drained out of the system from the drain line L15a, and the gas component is decarboxylated through the separated gas discharge line L14. Introduced into the device 5.

  Next, in step S33, the measurement value of the thermometer 71 is detected, and whether or not the fluctuation range of the measurement value of the thermometer 71 is maintained within a predetermined range for a predetermined time or longer (in this embodiment, the fluctuation range is It is judged whether it is maintained for 20 seconds or more in a state within ± 20%). If the state cannot be maintained, the process returns to step S32. On the other hand, when the said state can be maintained, it moves to step S34 and terminates a condensed water drainage process temporarily.

  In step S34, the drain valve V1 is closed, the open / close valve V2 is opened, and the condensed water recovered by the gas-liquid separator 20 is introduced into the deaerator 5 through the combustion exhaust gas condensed water recovery line L15a and the separated gas discharge line L14. .

  Next, in step S35, the measurement value of the thermometer 71 is detected, and it is determined whether or not the fluctuation range of the measurement value of the thermometer 71 is within a predetermined range (in this embodiment, the fluctuation range is within ± 20%). To do. When the fluctuation range of the measured value is not within the predetermined range, the process returns to step S32. On the other hand, when the fluctuation range of the measured value is within the predetermined range, the process proceeds to step S36.

  In step S36, it is determined whether the temperature of the reforming catalyst layer 3a exceeds a predetermined temperature (540 ° C. or higher in this embodiment). When the temperature of the reforming catalyst layer 3a is lower than the predetermined temperature, the process returns to step S35, and when the temperature of the reforming catalyst layer 3a exceeds the predetermined temperature, the condensed water discharge process is terminated.

  Note that step S34 and step S35 may be omitted.

  Next, in the first embodiment, a fifth embodiment using a particle counter as a means for detecting the combustion state of the combustion section 3b will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the same location as 1st embodiment, and the description is abbreviate | omitted.

  In this embodiment, the difference from the first embodiment is that a particle counter 81 is arranged in the combustion exhaust gas discharge line L13.

  In this embodiment, the opening / closing control of the drain valve V <b> 1 and the opening / closing valve V <b> 2 is performed based on the measured value of the particle counter 81.

  If the combustion state of the combustion unit 3b is unstable, the amount of soot and the like mixed in the combustion exhaust gas increases, so that the combustion state of the combustion unit 3b can be grasped by using the measured value of the particle counter 81 as a guideline. it can.

  Hereinafter, a description will be given using the flowchart shown in FIG.

  First, in step S41, combustion of combustion fuel is started in the combustion section 3b.

  Next, in step S42, the drain valve V1 is opened and the on-off valve V2 is closed. The combustion exhaust gas discharged from the combustion section 3b is gas-liquid separated by the gas-liquid separator 20, the condensed water is drained out of the system from the drain line L15a, and the gas component is decarboxylated through the separated gas discharge line L14. Introduced into the device 5.

  Next, in step S43, the measurement value of the particle counter 81 is detected, and it is determined whether or not the measurement value is less than a predetermined value. If the measured value of the particle counter 81 exceeds the predetermined value, the process returns to step S42. On the other hand, when the measured value of the particle counter 81 is less than the predetermined value, the process proceeds to step S44, and the condensed water draining process is temporarily terminated.

  In step S44, the drain valve V1 is closed, the open / close valve V2 is opened, and the condensed water recovered by the gas-liquid separator 20 is introduced into the deaerator 5 through the combustion exhaust gas condensed water recovery line L15a and the separated gas discharge line L14. .

  Next, in step S45, the measurement value of the particle counter 81 is detected, and it is determined whether or not the measurement value is less than a predetermined value. If the measured value of the particle counter 81 exceeds the predetermined value, the process returns to step S42. On the other hand, when the measured value of the particle counter 81 is less than the predetermined value, the process proceeds to step S46.

  In step S46, it is determined whether the temperature of the reforming catalyst layer 3a exceeds a predetermined temperature (540 ° C. or higher in this embodiment). When the temperature of the reforming catalyst layer 3a is lower than the predetermined temperature, the process returns to step S45, and when the temperature of the reforming catalyst layer 3a exceeds the predetermined temperature, the condensed water discharge step is ended.

  Step S44 and step S45 may be omitted.

  Next, in the first embodiment, a sixth embodiment in which the condensed water discharge step is performed while supplying raw fuel as combustion fuel for the combustion section will be described with reference to FIG. To do. In addition, the same code | symbol is attached | subjected to the same location as 1st embodiment, and the description is abbreviate | omitted.

In this embodiment, the on-off control of the drain valve V1 and the on-off valve V2 is performed on the on-off valves V3 and V4 interposed in the raw fuel supply line L9, the on-off valve V5 renovated to the reformed gas supply line L1, and the reformed gas. It differs from the first embodiment in that it is programmed in advance in the control means together with the on / off control of the on / off valve V6 interposed in the bypass line L22 connecting the supply line L1 and the anode offgas discharge line L3.
Hereinafter, control of the valves V1 to V6 will be described.

  First, when starting the reformer 3, the on-off valve V3 is opened to supply raw fuel to the combustion unit 3b, and combustion of combustion fuel is started. At this time, the on-off valves V4 to V6 are closed.

  Next, the drain valve V1 is opened and the on-off valve V2 is closed. The combustion exhaust gas discharged from the combustion section 3b is gas-liquid separated by the gas-liquid separator 20, the condensed water is drained out of the system from the drain line L15a, and the gas component is decarboxylated through the separated gas discharge line L14. Introduced into the device 5.

  Next, after detecting that the catalyst temperature has reached 540 ° C., the on-off valve V6 on the bypass line L22 is opened, and subsequently the on-off valve V4 is opened to supply raw fuel to the reforming catalyst layer 3a. Start the reforming reaction.

  When the reformed gas reaches the combustion section 3b through the bypass line L22, the reformed gas can be used as combustion fuel, and the on-off valve V3 is then closed. The timing for closing the on-off valve V3 is set by obtaining in advance the time required for the reformed gas to reach the combustion section 3b (in this embodiment, two minutes after opening the on-off valve V4).

  Next, the drain valve V1 is closed and the on-off valve V2 is opened to complete the condensed water discharge process. The condensed water recovered by the gas-liquid separator 20 passes through the combustion exhaust gas condensed water recovery line L15a and the separated gas discharge line L14. And introduced into the decarboxylation device 5.

  The timing for closing the drain valve V1 may be controlled so that it closes simultaneously with closing the on-off valve V3, or the time required for the raw fuel to become combustion exhaust gas and exhaust from the combustion section 3b is obtained in advance. The on-off valve V3 may be controlled to be closed after the set time has elapsed.

  In the first to sixth embodiments described above, the opening / closing control of the discharge valve V1 and the opening / closing valve V2 installed in the separation gas discharge line L14 and the combustion exhaust gas condensed water extraction line L15 extending from the gas-liquid separator 20 is performed. Although the condensed water discharge process is performed, the present invention is not limited to this configuration, and any structure that can realize the condensed water discharge process of the present invention may be used. For example, the structure shown in FIG.

  That is, in the configuration shown in FIG. 12, a portion of the combustion exhaust gas line L13 on the downstream side of the combustion exhaust gas heat exchanger Q4 is branched, and a pipe L23 connected to the decarbonation device 5, a drain valve V1a, and a drain trap 25 are provided. It is connected to the arranged pipe L24. Further, a water tank may be installed in the front stage of the drain trap 25, and combustion exhaust gas containing condensed water may be supplied to the drain trap via the water tank.

  As the drain trap 25, a conventionally known one can be used. For example, the drain trap shown in FIGS. 13 and 14 is exemplified. These may be used alone or in combination.

  The drain trap shown in FIG. 13 is composed of a pipe 40 bent in a U-shape. A pipe L24 communicating with a combustion exhaust gas line L13 is connected to a start part 41 of the pipe 40, and a terminal part 42 extends downward. It is connected to the drainage line L24a, and is configured to store condensed water in the U-shaped portion and drain it outside the system when a certain amount of water is exceeded.

  In the drain trap shown in FIG. 14, a combustion exhaust gas inlet 46 connected to the pipe L <b> 24 is formed in the upper part of the housing 45. Further, a condensate outlet 48 is formed at the bottom of the housing 45, and a drain line L24b is connected to the outside of the system. A valve 50 that is mechanically opened and closed by the action of the float 49 is disposed at the condensed water outlet 48.

  The drain valve V1a is controlled to be opened and closed during the condensed water discharge process and closed after the condensed water discharge process. For this reason, during the condensed water draining process, the condensed water in the combustion exhaust gas condensed by the combustion exhaust gas heat exchanger Q4 is drained out of the fuel cell power generation device via the discharge valve V1a and the drain trap 25. Note that the gas component in the combustion exhaust gas is introduced into the decarbonation device 5 through the pipe L23 and exhausted from the exhaust line L17 to the outside even during the condensed water drainage process. And after completion | finish of a condensed water discharge process, since the discharge valve V1a is closed, both condensed water and combustion exhaust gas are sent to the decarbonation apparatus 5 through the piping L24.

  According to this aspect, since the number of valve bodies can be reduced, the number of parts is reduced, and the apparatus cost can be reduced.

1 is a schematic configuration diagram of a first embodiment of a fuel cell power generator of the present invention. It is a schematic block diagram of 2nd embodiment of the fuel cell electric power generating apparatus of this invention. It is a flowchart figure which shows the opening / closing control of an on-off valve and a drain valve using the fuel cell power generation device. It is a schematic block diagram of 3rd embodiment of the fuel cell electric power generating apparatus of this invention. It is a flowchart figure which shows the opening / closing control of an on-off valve and a drain valve using the fuel cell power generation device. It is a schematic block diagram of 4th embodiment of the fuel cell power generator of this invention. It is a flowchart figure which shows the opening / closing control of an on-off valve and a drain valve using the fuel cell power generation device. It is another flowchart figure which shows the opening / closing control of an on-off valve and a drain valve using the fuel cell power generation device. It is a schematic block diagram of 5th embodiment of the fuel cell electric power generating apparatus of this invention. It is a flowchart figure which shows the opening / closing control of an on-off valve and a drain valve using the fuel cell power generation device. It is a schematic block diagram of 6th embodiment of the fuel cell power generator of this invention. It is a schematic block diagram of the apparatus structure for implementing the condensed water discharge process of this invention. It is a schematic block diagram which shows an example of a drain trap. It is a schematic block diagram which shows another example of a drain trap.

Explanation of symbols

1: Fuel cell body 1a: Anode electrode 1b: Cathode electrode 1c: Electrolyte 1d: Cooling system 2: Humidifier 3: Reforming device 3a: Reforming catalyst layer 3b: Combustion unit 4: Water tank 5: Decarbonation device 6: Drain port 8: Inlet filter 10: Water treatment device 12: Battery cooling water tank 20: Gas-liquid separator 25: Drain traps 51-53: Pressure gauges 61-63: Flow meter 71: Thermometer 81: Particle counter L1: Modified Quality gas supply line L2: Reformed gas condensate supply line L3: Anode offgas discharge line L4: Anode offgas condensate supply line L5: Air supply line L6: Cathode offgas discharge line L7: Battery cooling water supply line L8: Battery cooling water Discharge line L9: Raw fuel supply line L10: Reformed water supply line L11: Combustion air supply line L12: Combustion fuel supply line L13: Burning exhaust gas line L14: Separation gas discharge line L15: Combustion exhaust gas condensed water take-out line L15a: Drainage line L15b: Combustion exhaust gas condensed water recovery line L17: Exhaust line L18: Battery cooling water overflow line L19: Tank water overflow line L20: Recovered water Supply line L21: Concentrated water discharge line P1: Recovered water pump Q1: Reformed gas drain trap Q2: Anode offgas drain trap Q3: Cathode offgas heat exchanger Q4: Combustion exhaust gas heat exchanger V1: Drain valve V2-V6: Open / close valve

Claims (18)

A reforming catalyst layer that steam-reforms a raw fuel containing hydrocarbons to generate a hydrogen-containing gas, a reforming device having a combustion section that supplies reaction heat to the reforming catalyst layer, and the hydrogen-containing gas and oxidant A fuel cell main body that generates power by reacting with gas, supplying combustion fuel and combustion air to the combustion section to generate the reaction heat, and the combustion exhaust gas discharged from the combustion section is gas-liquid A method for starting a fuel cell power generator configured to separate and collect condensed water and to reuse the condensed water,
At the start of the fuel cell power generation device, after starting combustion in the combustion section, a condensed water discharge step for draining condensed water generated from the combustion exhaust gas outside the system is performed,
After the condensed water draining step, start collecting condensed water generated from the combustion exhaust gas,
A starting method for a fuel cell power generator.   The method for starting a fuel cell power generator according to claim 1, wherein the condensate discharge step is performed at least until it is detected that the combustion state of the combustion section is stabilized.   The method for starting a fuel cell power generator according to claim 1, wherein the condensed water discharge step is performed while the raw fuel is supplied as a combustion fuel.   The method for starting a fuel cell power generator according to claim 1, wherein the condensate draining step is performed until a predetermined time has elapsed from the start of starting the fuel cell power generator.   2. The fuel cell according to claim 1, wherein the condensed water discharge step is performed while a pressure fluctuation range of one or more kinds of gases selected from combustion fuel, combustion air, and combustion exhaust gas exceeds a set value. How to start the power generator.   2. The fuel cell according to claim 1, wherein the condensed water discharge step is performed while a flow rate fluctuation range of one or more kinds of gases selected from combustion fuel, combustion air, and combustion exhaust gas exceeds a set value. How to start the power generator.   The method for starting the fuel cell power generator according to claim 1 or 2, wherein the condensed water discharge step is performed while a temperature fluctuation range of the combustion section exceeds a set value.   The start method of the fuel cell power generator according to claim 1, wherein the condensed water discharge step is performed while the temperature rise rate of the combustion section is lower than a set value.   The method for starting a fuel cell power generator according to claim 1, wherein the condensed water discharge step is performed while a detected value of the combustion exhaust gas by a particle counter exceeds a set value. A reforming catalyst layer that steam-reforms a raw fuel containing hydrocarbons to generate a hydrogen-containing gas, and a reforming device having a combustion section that supplies reaction heat to the reforming catalyst layer;
A fuel cell body that generates power by reaction with the hydrogen-containing gas and the oxidant gas;
A combustion fuel line for supplying combustion fuel to the combustion section;
A combustion air line for supplying combustion air to the combustion section;
A gas-liquid separator that gas-liquid separates the flue gas discharged from the combustion section and collects condensed water; and
A combustion exhaust gas line connecting the combustion section and the gas-liquid separator;
A decarboxylation device;
A condensed water line for introducing condensed water in the gas-liquid separator and combustion exhaust gas after gas-liquid separation into the decarbonation device;
A water tank for storing condensed water decarboxylated by the decarboxylation device;
A drainage line for draining the condensed water in the gas-liquid separator to the outside of the system,
When starting the fuel cell power generator, the condensed water generated from the combustion exhaust gas discharged after the start of combustion in the combustion section is drained out of the system from the drainage line, and then the condensation generated from the combustion exhaust gas Configured to supply water from the condensed water line to the decarbonator;
A fuel cell power generator characterized by that. A reforming catalyst layer that steam-reforms a raw fuel containing hydrocarbons to generate a hydrogen-containing gas, and a reforming device having a combustion section that supplies reaction heat to the reforming catalyst layer;
A fuel cell body that generates power by reaction with the hydrogen-containing gas and the oxidant gas;
A combustion fuel line for supplying combustion fuel to the combustion section;
A combustion air line for supplying combustion air to the combustion section;
A decarboxylation device;
A combustion exhaust gas line for guiding the combustion exhaust gas discharged from the combustion section to the decarbonation device;
A water tank for storing condensed water decarboxylated by the decarboxylation device;
A heat exchanger provided on the combustion exhaust gas line for cooling the combustion exhaust gas;
A drain trap connected to a downstream side of the heat exchanger on the combustion exhaust gas line via a valve, and separating condensed water from the combustion exhaust gas;
A drainage line for draining the condensed water in the drain trap to the outside of the system,
At the start of the fuel cell power generation device, the condensed water generated from the combustion exhaust gas discharged after the start of combustion in the combustion section is drained out of the system by opening the valve, and then generated from the combustion exhaust gas. The condensed water is configured to be supplied to the decarboxylation device with the valve closed.
A fuel cell power generator characterized by that.   The fuel cell power generator according to claim 10 or 11, wherein the condensed water is drained out of the system from the drainage line at least until it is detected that the combustion state of the combustion section is stabilized.   The fuel cell power generator according to claim 10 or 11, wherein the condensed water is drained out of the system from the drainage line while the raw fuel is used as a combustion fuel.   The fuel cell power generator according to claim 10 or 11, wherein the condensate is drained out of the system from the drain line until a predetermined time has elapsed since the start of the fuel cell power generator. A pressure gauge is disposed in at least one of the combustion fuel line, the combustion air line, and the combustion exhaust gas line;
The fuel cell power generation according to claim 10 or 11, wherein the condensed water is drained out of the system from the drainage line while the fluctuation range of the detected value of the pressure gauge exceeds a set value. apparatus. A flow meter is disposed in at least one of the combustion fuel line, the combustion air line, and the combustion exhaust gas line;
The fuel cell power generation according to claim 10 or 11, wherein the condensed water is drained out of the system from the drainage line while the fluctuation range of the detection value of the flow meter exceeds a set value. apparatus. A thermometer is arranged in the combustion part,
While the fluctuation range of the detected value of the thermometer exceeds the set value and / or while the temperature rises below the preset temperature increase rate, the condensed water is drained out of the system from the drain line. The fuel cell power generator according to claim 10 or 11. A particle counter is disposed in the combustion exhaust gas line,
The fuel cell power generator according to claim 10 or 11, wherein the condensed water is drained out of the system from the drainage line while the detection value of the particle counter exceeds a set value.