JP6278767B2 - Diagnostic method for reformer and diagnostic device for reformer - Google Patents

Description

  According to the present invention, a reforming section in which a reforming catalyst is charged and a combustion section that forms a combustion space are disposed in a state where the reforming section is partitioned by heat transferable partition walls, and the combustion fuel supply means A reforming burner for combusting the supplied combustion fuel in the combustion space with the combustion oxygen-containing gas supplied by the oxygen-containing gas supply means diagnoses an abnormality of the reformer provided in the combustion section The present invention relates to a method for diagnosing a reformer and a diagnostic device for a reformer.

This reformer reforms hydrocarbon-based raw fuel supplied in a mixed state with water vapor by the catalytic action of the reforming catalyst in the reforming section to generate reformed gas mainly composed of hydrogen gas. The generated reformed gas is used for a power generation reaction in a fuel cell, for example.
In other words, the reforming catalyst is burned in the combustion space by the reforming burner with the combustion oxygen-containing gas supplied by the oxygen-containing gas supply means by the combustion fuel supplied by the combustion fuel supply means. Heating is performed so that the raw fuel can be reformed.

By the way, in such a reformer, various abnormalities may occur.
Therefore, conventionally, for example, a pump or the like used as an example of a combustion fuel supply means generates a pulsation in a low flow rate region when the amount of combustion fuel supplied to the reforming burner is small, and is used for reforming. As the combustion of the burner becomes unstable, there is one configured to execute control capable of eliminating the influence of pulsation in a low flow rate region in the fuel supply means for combustion when the reformer is started (for example, , See Patent Document 1). A description of the control for eliminating the influence of the pulsation of the combustion fuel supply means will be omitted.

JP 2008-105861 A

However, conventionally, when an abnormality has occurred in the reformer, it has not been possible to diagnose which part of the reformer the abnormality is.
In particular, when an abnormality occurs in the reforming burner, the amount of carbon monoxide gas generated increases when the combustion fuel is burned, or the reforming catalyst is not properly heated, and Since there is a possibility that the composition may become abnormal, it is necessary to appropriately diagnose the abnormality and take measures.
Therefore, in particular, it is desired to appropriately diagnose abnormality of the reforming burner.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a diagnostic method and a diagnostic apparatus for a reforming apparatus that can appropriately diagnose at least an abnormality of the reforming burner.

The reformer diagnosis method according to the present invention is arranged in a state in which a reforming section in which a reforming catalyst is charged and a combustion section that forms a combustion space are partitioned by partition walls capable of transferring heat. And
A reforming burner provided in the combustion section is provided with a reforming burner for burning the combustion fuel supplied by the combustion fuel supply means in the combustion space with the combustion oxygen-containing gas supplied by the oxygen-containing gas supply means. To diagnose abnormalities in the quality device,
Its feature configuration is
The reforming burner has an ejection path from the combustion fuel receiving section from the combustion fuel supply means to the ejection section with respect to the combustion space via the ejection flow path, the receiving section, the ejection Provided with a plurality of flow paths and different ejection parts,
An ejection path switching means capable of selectively switching an operation ejection path which is the ejection path for ejecting the combustion fuel from the combustion fuel supply means to the combustion space from the plurality of ejection paths;
When the carbon monoxide concentration in the combustion gas of the reforming burner is higher than a predetermined upper limit value,
After performing the ejection path change process for operating the ejection path switching means to change the ejection path for operation, the carbon monoxide concentration in the combustion gas is detected, and an abnormality is diagnosed based on the detection result There is in point to do.

That is, in the reforming burner, in particular, the jet part (for example, the jet hole) for jetting the combustion fuel and the vicinity of the jet hole are heated to a high temperature, and therefore abnormal due to deterioration (for example, the shape of the jet hole). Change) is relatively likely to occur.
If an abnormality occurs in the vicinity of the ejection part, it becomes difficult to perform combustion properly due to an abnormality in the ejection of the fuel for combustion into the combustion space. Therefore, monoxide in the combustion gas discharged from the combustion part The carbon concentration may be high.

Therefore, the reforming burner has an ejection path from the receiving portion for the combustion fuel from the combustion fuel supply means through the ejection passage to the ejection portion for the combustion space of the combustion fuel, the receiving portion, the ejection passage and A plurality of jetting parts are provided in different states.
Further, there is provided an ejection path switching means capable of selectively switching an operation ejection path, which is an ejection path for ejecting the combustion fuel from the combustion fuel supply means to the combustion space, from a plurality of ejection paths.
Incidentally, each of the plurality of ejection paths ejects and burns an amount of combustion fuel necessary for heating the reforming catalyst in a desired manner (so that the reforming process can be appropriately performed). Configured to be possible.

Then, the carbon monoxide concentration in the combustion gas of the reforming burner is detected, and when the carbon monoxide gas concentration becomes higher than a predetermined upper limit value, the ejection path switching means is operated, After executing the ejection path changing process for changing the ejection path, the carbon monoxide concentration in the combustion gas is detected, and an abnormality is diagnosed based on the detection result.
If the carbon monoxide concentration in the combustion gas is high due to abnormalities in the operational ejection path, such as when an abnormality occurs in the ejection part, etc., the ejection path change processing is executed to When the path is changed to an operation ejection path in which no abnormality has occurred, the carbon monoxide concentration in the combustion gas decreases to a normal value.
In other words, since the abnormality of the ejection path is a typical abnormality of the reforming burner, as described above, the ejection path changing process is executed and the carbon monoxide concentration in the combustion gas after the execution is detected. By diagnosing the abnormality based on the result, the abnormality of the reforming burner can be properly diagnosed.
Therefore, it is possible to provide a method for diagnosing a reformer that can appropriately diagnose at least an abnormality of the reforming burner.

A further characteristic configuration of the reforming apparatus diagnosis method according to the present invention is as follows.
When the concentration of carbon monoxide in the combustion gas becomes higher than the upper limit value, the operating condition of the oxygen-containing gas supply means, the supply amount of combustion oxygen-containing gas to the reforming burner, and the supply amount of combustion fuel Was changed from a steady operating condition to an amount according to the condition to a diagnostic operating condition in which the amount of combustion oxygen-containing gas supplied to the reforming burner was increased more than the amount corresponding to the amount of fuel supplied. rear,
When the concentration of carbon monoxide in the combustion gas is less than or equal to the upper limit value,
Performing the ejection path changing process in a steady state by operating the oxygen-containing gas supply means under the steady operating conditions and executing the ejection path changing process;
When the carbon monoxide concentration in the combustion gas is higher than the upper limit,
The oxygen-containing gas supply means is operated under the diagnostic operating conditions, and the ejection path changing process is executed, and the ejection path changing process in the oxygen-containing gas increasing state is executed.

That is, even if an abnormality occurs in the oxygen-containing gas supply means and the oxygen-containing gas supply means is operated under steady operating conditions, the amount of combustion oxygen-containing gas supplied to the reforming burner depends on the amount of fuel supplied for combustion. If this amount is not reached, the concentration of carbon monoxide in the combustion gas may increase.
Therefore, when the concentration of carbon monoxide in the combustion gas becomes higher than the upper limit, first, the operating condition of the oxygen-containing gas supply means is changed from the steady operating condition to the combustion oxygen-containing gas supply amount to the reforming burner. The operating condition for diagnosis is increased to an amount that is greater than the amount corresponding to the amount of fuel supplied.
When the operating condition of the oxygen-containing gas supply means is changed from the steady operating condition to the diagnostic operating condition, when the carbon monoxide concentration in the combustion gas decreases, the operating condition of the oxygen-containing gas supplying means is changed to the steady operating condition. By returning and executing the ejection path changing process, the ejection path changing process in the steady state is executed, and abnormality is diagnosed based on the detection result of the carbon monoxide concentration in the combustion gas after the execution.
On the other hand, if the concentration of carbon monoxide in the combustion gas remains higher than the upper limit even if the operating condition of the oxygen-containing gas supply means is changed from the steady operating condition to the diagnostic operating condition, the oxygen-containing gas supply means By executing the ejection path changing process with the operating condition set as the diagnostic operating condition, the ejection path changing process in the increased oxygen-containing gas state is executed, and the carbon monoxide concentration in the combustion gas after the execution is changed. An abnormality is diagnosed based on the detection result.

  Thus, before executing the ejection path changing process, first, the operating condition of the oxygen-containing gas supply means is changed from the steady operating condition to the diagnostic operating condition, and the carbon monoxide concentration detection result after the change is obtained. Based on the detection result of the carbon monoxide concentration, either the ejection path changing process in the steady state or the ejection path changing process in the oxygen-containing gas increased state is executed, and the abnormality is diagnosed. In addition to the abnormality of the quality burner, the abnormality of the oxygen-containing gas supply means can be properly diagnosed.

A further characteristic configuration of the reforming apparatus diagnosis method according to the present invention is as follows.
When executing the ejection route change process in the steady state,
When the carbon monoxide concentration in the combustion gas is equal to or lower than the upper limit value, it is diagnosed that the reforming burner is abnormal, and the carbon monoxide concentration in the combustion gas is higher than the upper limit value. Is diagnosed as a minor abnormality of the oxygen-containing gas supply means,
When performing the ejection path changing process in the oxygen-containing gas increased state,
When the carbon monoxide concentration in the combustion gas is equal to or lower than the upper limit value, it is diagnosed that the reforming burner is abnormal, and the carbon monoxide concentration in the combustion gas is higher than the upper limit value. Is that it is diagnosed as a serious abnormality of the oxygen-containing gas supply means or an abnormality of the combustion fuel supply means.

According to the above characteristic configuration, if the carbon monoxide concentration in the combustion gas is equal to or lower than the upper limit value when the ejection path changing process in the steady state is executed, it is diagnosed that the reforming burner is abnormal. When the carbon monoxide concentration in the combustion gas is higher than the upper limit value, it is diagnosed that the oxygen-containing gas supply means has a slight abnormality.
On the other hand, if the carbon monoxide concentration in the combustion gas is lower than the upper limit when performing the ejection path changing process in the oxygen-containing gas increasing state, it is diagnosed that the reforming burner is abnormal, and combustion When the carbon monoxide concentration in the gas is higher than the upper limit value, it is diagnosed that the oxygen-containing gas supply means is seriously abnormal or the combustion fuel supply means is abnormal.

In other words, the oxygen-containing gas supply means has a slight abnormality such as a slight pulsation, and the supply amount of the combustion oxygen-containing gas may be reduced by a small amount. Therefore, the concentration of carbon monoxide in the combustion gas is high. There is a case. In this case, if the operating condition of the oxygen-containing gas supply means is changed from the steady operating condition to the diagnostic operating condition, the supply amount of the combustion oxygen-containing gas increases and the carbon monoxide concentration in the combustion gas decreases. When the operating condition of the oxygen-containing gas supply means is returned to the steady operating condition, the supply amount of the combustion oxygen-containing gas is reduced to the original value, so that the carbon monoxide concentration is considered to be higher than the upper limit value.
In addition, since the oxygen-containing gas supply means has a severe abnormality such as a severe pulsation or a decrease in output, the concentration of carbon monoxide in the combustion gas may increase. In this case, even if the operating condition of the oxygen-containing gas supply means is changed from the steady operating condition to the diagnostic operating condition, the supply amount of the combustion oxygen-containing gas does not reach the set amount. The concentration is considered to remain higher than the upper limit.

  In addition, since there is an abnormality such as pulsation in the combustion fuel supply means, fluctuations in the amount of fuel supplied may increase, and the carbon monoxide concentration in the combustion gas may increase. In this case, even if the operating condition of the oxygen-containing gas supply means is changed from the steady operating condition to the diagnostic operating condition, the supply amount of combustion fuel varies greatly, so the carbon monoxide concentration in the combustion gas is the upper limit value. It is thought that it may remain higher than.

Further, the carbon monoxide concentration in the combustion gas may become high due to an abnormality in the operation ejection flow path. In this case, if the oxygen-containing gas supply means is normal, the operation ejection flow path is changed to a normal operation ejection flow path regardless of whether the operation condition is a steady operation condition or a diagnosis operation condition. Then, it is considered that the carbon monoxide concentration in the combustion gas becomes the upper limit value or less. Further, if there is an abnormality in the operation ejection flow path, and if the abnormality is minor, the operating condition of the oxygen-containing gas supply means is changed to a diagnostic operating condition, and the supply amount of the combustion oxygen-containing gas is increased. It is considered that the concentration of carbon monoxide in the combustion gas may decrease.
Therefore, based on the above viewpoint, the ejection in the steady state is based on the concentration of carbon monoxide in the combustion gas after the operating condition of the oxygen-containing gas supply means is changed from the steady operating condition to the diagnostic operating condition. In addition to reforming burner abnormality, minor abnormality of oxygen-containing gas supply means and oxygen-containing gas in addition to abnormality of reforming burner by selecting and executing path changing process or ejection route changing process in oxygen-containing gas increasing state It is possible to diagnose a serious abnormality of the supply means or an abnormality of the combustion fuel supply means.

A further characteristic configuration of the reforming apparatus diagnosis method according to the present invention is as follows.
The reformed gas mainly composed of hydrogen gas generated in the reforming unit is configured to be supplied to the fuel cell,
Off gas discharged in a state where hydrogen remains from the fuel cell is configured to be supplied to the reforming burner as the combustion fuel,
If the carbon monoxide concentration in the combustion gas is higher than the upper limit value when performing the ejection path changing process in the steady state, a slight abnormality in the oxygen-containing gas supply means, or the off-gas Diagnosed as an abnormal composition,
If the carbon monoxide concentration in the combustion gas is higher than the upper limit value when the ejection path changing process in the oxygen-containing gas increasing state is performed, the combustion fuel supply means supplies the combustion fuel. Stop,
When the carbon monoxide concentration in the combustion gas is equal to or lower than the upper limit value, it is diagnosed that the combustion fuel supply means is abnormal, and the carbon monoxide concentration in the combustion gas is higher than the upper limit value. In this case, the oxygen-containing gas supply means is diagnosed as having a serious abnormality.

According to the above characteristic configuration, the off-gas discharged from the fuel cell in a state where hydrogen remains is supplied to the reforming burner together with the combustion fuel from the combustion fuel supply means as the combustion fuel. Burn with.
If the carbon monoxide concentration in the combustion gas is higher than the upper limit when the ejection path changing process in the steady state is performed, a slight abnormality in the oxygen-containing gas supply means or an abnormality in the off-gas composition Diagnose that.
On the other hand, if the carbon monoxide concentration in the combustion gas is higher than the upper limit value when the ejection path changing process in the oxygen-containing gas increasing state is executed, the supply of combustion fuel by the combustion fuel supply means is stopped. When the carbon monoxide concentration in the combustion gas is below the upper limit value, it is diagnosed that the fuel supply means for combustion is abnormal, and when the carbon monoxide concentration in the combustion gas is higher than the upper limit value, oxygen Diagnose a serious abnormality of the contained gas supply means.

That is, when the reforming capacity decreases due to deterioration of the reforming catalyst or the like, the composition of the reformed gas changes, the hydrogen concentration decreases, and the raw fuel concentration increases.
Thus, when the carbon monoxide concentration in the combustion gas becomes high due to the change in the composition of the reformed gas, the operating condition of the oxygen-containing gas supply means is changed from the steady operating condition to the diagnostic operating condition, Increasing the supply amount of combustion oxygen-containing gas decreases the carbon monoxide concentration in the combustion gas, but returns the operating condition of the oxygen-containing gas supply means to the steady operating condition, and supplies the combustion oxygen-containing gas supply amount. Is restored, the carbon monoxide concentration in the combustion gas is considered to be higher than the upper limit value even if the operation ejection path is changed.

In addition, the combustion fuel supply means has an abnormality such as pulsation, and the variation in the supply amount of the combustion fuel may cause a large concentration of carbon monoxide in the combustion gas. In this case, when the off-gas is supplied to the reforming burner together with the combustion fuel from the combustion fuel supply means, the operating condition of the oxygen-containing gas supply means is changed from the steady operation condition to the diagnostic operation condition. Even if the supply amount of the oxygen-containing gas for combustion is increased, the carbon monoxide concentration in the combustion gas is considered to be higher than the upper limit value.
Therefore, in such a case, if the supply of combustion fuel by the combustion fuel supply means is stopped and only the off-gas is burned in the reforming burner, the concentration of carbon monoxide in the combustion gas is increased. Therefore, it is considered that the carbon monoxide concentration in the combustion gas is less than or equal to the upper limit value.

  This characteristic configuration is based on such a point of view. With this characteristic configuration, it is possible to appropriately diagnose an abnormality in the off-gas composition and an abnormality in the combustion fuel supply means.

The diagnostic apparatus for a reformer according to the present invention is arranged in a state where a reforming section in which a reforming catalyst is charged and a combustion section that forms a combustion space therein are partitioned by partition walls that can transfer heat. And
A reforming burner provided in the combustion section is provided with a reforming burner for burning the combustion fuel supplied by the combustion fuel supply means in the combustion space with the combustion oxygen-containing gas supplied by the oxygen-containing gas supply means. To diagnose abnormalities in the quality device,
Its feature configuration is
The reforming burner has an ejection path from the combustion fuel receiving section from the combustion fuel supply means to the ejection section with respect to the combustion space via the ejection flow path, the receiving section, the ejection A plurality of flow paths and the ejection parts are provided in different states,
Carbon monoxide concentration detection means for detecting the carbon monoxide concentration in the combustion gas of the reforming burner;
An ejection path switching means capable of selectively switching an operation ejection path which is the ejection path for ejecting the combustion fuel from the combustion fuel supply means to the combustion space from the plurality of ejection paths;
When the carbon monoxide concentration in the combustion gas detected by the carbon monoxide concentration detection means becomes higher than a predetermined upper limit value, the ejection that changes the operation ejection path by operating the ejection path switching means An ejection route change processing means for executing route change processing;
Diagnostic means for diagnosing an abnormality based on the carbon monoxide concentration in the combustion gas detected by the carbon monoxide concentration detection means after the ejection route change processing is executed by the ejection route change processing means; Is in the point provided.

According to the above characteristic configuration, when the carbon monoxide concentration in the combustion gas detected by the carbon monoxide concentration detection means becomes higher than the predetermined upper limit value, the ejection path change processing means operates the ejection path switching means. An ejection path changing process for changing the operational ejection path is executed, and after the execution, an abnormality is detected based on the carbon monoxide concentration in the combustion gas detected by the carbon monoxide concentration detecting means by the diagnostic means. Diagnosed.
In other words, if the carbon monoxide concentration in the combustion gas is high due to abnormalities in the operational ejection path, such as when an abnormality occurs in the ejection part, etc. Is changed to an operational ejection path in which no abnormality occurs, the carbon monoxide concentration in the combustion gas is reduced to a normal value.
Since the abnormality of the ejection path is a typical abnormality of the reforming burner, as described above, the ejection path changing process is executed by the ejection path changing processing means, and the combustion gas in the combustion gas after the execution is executed. By diagnosing the abnormality by the diagnostic means based on the detection result of the carbon monoxide concentration, the abnormality of the reforming burner can be appropriately diagnosed.
Therefore, it is possible to provide a diagnostic apparatus for a reforming apparatus that can appropriately diagnose at least an abnormality of the reforming burner.

The block diagram which shows the whole structure of the reforming apparatus which concerns on 1st Embodiment. The longitudinal cross-sectional view of the reformer burner of the reformer according to the first embodiment The bottom view of the reformer burner of the reformer according to the first embodiment The block diagram which shows the whole structure of the reforming apparatus which concerns on 2nd Embodiment. Longitudinal sectional view of the reforming burner of the reforming apparatus according to the second embodiment The bottom view of the reforming burner of the reformer according to the second embodiment The figure which shows the flowchart of control operation of abnormality diagnosis control Block diagram of a hydrogen-containing gas generator equipped with a reformer Vertical section of a hydrogen-containing gas generator equipped with a reformer

Hereinafter, an embodiment in which the present invention is applied to a reformer R provided in a hydrogen-containing gas generator P for a fuel cell will be described with reference to the drawings.
[First Embodiment]
First, the first embodiment will be described.
As shown in FIGS. 8 and 9, the hydrogen-containing gas generator P is a hydrocarbon-based raw fuel gas (for example, a natural gas-based city such as 13A) supplied by the raw fuel blower 32 through the raw fuel supply passage 31. The desulfurization unit 1 for desulfurizing the gas), the steam generation unit J for generating steam by heating the raw water supplied by the reforming water pump 34 through the reforming water supply path 33, and the desulfurization unit 1 A reformer R that reforms the raw fuel gas using the steam generated in the steam generator J to generate a reformed gas mainly composed of hydrogen gas, and the reformer R supplies the reformed gas. The carbon monoxide gas in the reformed gas is converted to carbon dioxide gas using water vapor, and the carbon monoxide gas in the reformed gas supplied from the shift unit 4 is selectively oxidized. Selective oxidation unit 5 and operation control It is configured to include a rolling controller C or the like, and is configured to generate a low hydrogen-containing gas concentration of carbon monoxide.

The reformed gas generated by the hydrogen-containing gas generation device P is supplied to the fuel cell G through the fuel gas channel 35 as a fuel gas for power generation.
Since this fuel cell G is well known, a detailed description and illustration thereof will be omitted. For example, the fuel cell G is configured in a solid polymer type in which a plurality of cells each having a solid polymer membrane as an electrolyte layer are provided in a stacked state. The fuel gas is supplied from the hydrogen-containing gas generating device P to the fuel electrode of each cell through the fuel gas flow path 35, and the air is supplied from the reaction air blower 36 to the oxygen electrode of each cell, so that hydrogen and oxygen It is comprised so that electric power generation may be performed by the electrochemical reaction.

Next, each part of the hydrogen-containing gas generator P will be described.
As shown in FIG. 1, the reformer R includes a partition wall W capable of transferring heat between a reforming unit 6 in which a reforming catalyst 61 is inserted and a combustion unit 7 that forms a combustion space 71 therein. It is arranged and configured in a partitioned state.
Combustion gas fuel (an example of combustion fuel, such as city gas such as 13A) supplied by a combustion fuel blower (an example of combustion fuel supply means) 10 through a combustion fuel supply path 9 is used as combustion air. The reforming catalyst 61 is burned in the combustion space 71 with combustion air (an example of an oxygen-containing gas for combustion) supplied by a combustion air blower 12 (an example of an oxygen-containing gas supply means) through the supply path 11. A reforming burner 8 for heating is provided in the combustion section 7.

Referring to FIG. 1, the reformer R will be described. The reformer R has a main body 13 in which a cylindrical inner cylinder 14 and an outer cylinder 15 are coaxially arranged, and both ends thereof are arranged. The inner cylinder 14 is closed with the upper plate 16 and the bottom plate 17, and further, the cylindrical radiation tube 18 is disposed inside the inner cylinder 14, the other end is separated from the bottom plate 17, and one end is fixed to the upper plate 16. 14 is provided coaxially.
An annular space formed between the inner cylinder 14 and the outer cylinder 15 is filled with the reforming catalyst 61, and the reforming section 6 is configured by the inner cylinder 14, the outer cylinder 15, the upper plate 16, the bottom plate 17, and the like. The
The space in the inner cylinder 14 is a combustion space 71, and the combustion section 7 is constituted by the inner cylinder 14, the upper plate 16, the bottom plate 17, and the like, and the reforming burner 8 is supported by the upper plate 16. In the state, it is provided coaxially with the inner cylinder 14.
The inner cylinder 14 is configured to function as a partition wall W.

  In the state where the upper plate 16 communicates with the annular space between the outer cylinder 15 and the inner cylinder 14, the raw fuel gas inlet 19 communicates with the annular space between the inner cylinder 14 and the radiation cylinder 18. Each of the combustion gas outlets 21 is provided, and the reformed gas outlet 20 is provided on the bottom plate 17 so as to communicate with the annular space between the inner cylinder 14 and the outer cylinder 15.

The combustion fuel supply path 9 and the combustion air supply path 11 are connected to a mixer 22, and in the mixer 22, the combustion gas fuel from the combustion fuel supply path 9 and the combustion air supply path 11 are connected. Combustion air is mixed and the mixed gas is supplied to the reforming burner 8 through the mixed gas supply path 23.
Further, an offgas passage 24 for guiding offgas discharged from the fuel electrode of the fuel cell G in a state where hydrogen remains is connected to the mixer 22, and the offgas is supplied to the reforming burner 8 as combustion fuel. It is configured as follows.

The apparatus main body 13 is arranged with the upper plate 16 facing upward.
Then, the reforming burner 8 burns the mixture of the combustion gas fuel from the combustion fuel supply passage 9 and the combustion air from the combustion air supply passage 11 so that the combustion gas flows in the radiation cylinder 18. After flowing downward, it collides with the bottom plate 17, flows upward in the annular space between the inner cylinder 14 and the radiation cylinder 18, is discharged from the combustion gas outlet 21 to the combustion gas flow path 25, and the combustion gas The retained heat and the radiant heat from the radiation cylinder 18 are transferred to the inner cylinder 14 as the partition wall W, and the reforming catalyst 61 of the reforming unit 6 is heated.
The raw fuel gas mixed with water vapor is supplied from the raw fuel gas inlet 19 to the reforming unit 6, and is reformed by the action of the reforming catalyst 61 into a reformed gas mainly composed of hydrogen gas.
Incidentally, when the city gas (for example, 13A) containing methane gas as the main component is the raw fuel gas, the methane gas is produced under the reforming treatment temperature in the range of 600 to 700 ° C. by the catalytic action of the reforming catalyst 61, for example. And steam undergo a reforming reaction according to the following reaction formula, and reformed to a gas containing hydrogen gas and carbon monoxide gas.

CH ₄ + H ₂ O → CO + 3H ₂

  The reforming unit 6 is provided with a reforming unit temperature sensor 26 that detects the temperature of the reforming catalyst 61 filled in the annular space between the inner cylinder 14 and the outer cylinder 15. A CO concentration sensor 27 (an example of a carbon monoxide concentration detecting means) that detects the carbon monoxide concentration in the combustion gas of the reforming burner 8 discharged from the combustion section 7 is provided.

In the present invention, as shown in FIG. 2, the reforming burner 8 is supplied from the combustion gas fuel receiving portion 81 from the combustion fuel blower 10 to the combustion space 71 of the combustion gas fuel via the ejection passage 82. A plurality of ejection paths 80 reaching the ejection part 83 are provided in a state where the receiving part 81, the ejection flow path 82 and the ejection part 83 are different.
Further, as shown in FIG. 1, an operation ejection path 80, which is an ejection path 80 for ejecting combustion gas fuel from the combustion fuel blower 10 to the combustion space 71, is selected from a plurality of ejection paths 80. A switchable ejection path switching means 84 is provided.

  In this embodiment, the combustion gas fuel from the combustion fuel supply passage 9 and the combustion air from the combustion air supply passage 11 are mixed by the mixer 22, and the mixed gas is received through the mixed gas supply passage 23. Supplied to the unit 81.

As shown in FIGS. 2 and 3, the reforming burner 8 includes a disk-shaped nozzle portion 85 that ejects a mixed gas, and a flow path forming body 88 that guides the mixed gas received by the receiving portion 81 to the nozzle portion 85. And is configured.
The nozzle portion 85 is formed with a plurality (12 in this embodiment) of outer ejection holes 86 arranged in a ring at regular intervals, and a plurality (6 in this embodiment) are arranged inside the row of the annular outer ejection holes 86. ) Inner ejection holes 87 are arranged in a ring at regular intervals.
The total cross-sectional area obtained by summing the cross-sectional areas of the plurality of outer ejection holes 86 and the total cross-sectional area obtained by summing the cross-sectional areas of the plurality of inner ejection holes 87 are configured to be substantially equal.

The flow path forming body 88 is configured such that a cylindrical inner tube 89 and an outer tube 90 are coaxially arranged, and one end thereof is closed by a cover plate 91.
Between the inner tube 89 and the outer tube 90, an annular outer ejection flow path 92 having one end closed by the lid plate 91 and the other end opened is formed. An inner jet passage 93 that is closed and opened at the other end is formed.
The nozzle portion 85 and the flow path forming body 88 are such that the opening of the outer ejection flow path 92 of the flow path forming body 88 communicates with the plurality of outer ejection holes 86 of the nozzle section 85 and the flow path forming body 88. The inner ejection flow path 93 is integrally assembled by welding in a state where the inner ejection flow path 93 communicates with the plurality of inner ejection holes 87 of the nozzle portion 85.

  An outer receiving port 94 is attached to the end of the outer tube 90 on the side closed by the lid plate 91 in a state communicating with the outer ejection flow channel 92, and the lid plate 91 communicates with the inner ejection flow channel 93. The inner receiving port 95 is attached.

An outer receiving port 94 and an inner receiving port 95 are provided as the receiving part 81, an outer jetting channel 92 and an inner jetting channel 93 are provided as the jetting channel 82, and a row of outer jetting holes 86 as the jetting unit 83. And a row of inner ejection holes 87 is provided.
An outer ejection path 80e is configured by the outer receiving port 94, the outer ejection channel 92, and the plurality of outer ejection holes 86, and an inner ejection is performed by the inner receiving port 95, the inner ejection channel 93, and the plurality of inner ejection holes 87. A path 80i is configured.
That is, in the first embodiment, as the ejection path 80, an outer ejection path 80e and an inner ejection path 80i are provided.
Each of the outer ejection path 80e and the inner ejection path 80i is a combustion space for the amount of mixed gas (an example of combustion gas fuel) required to heat the reforming catalyst 61 so that the reforming process can be appropriately performed. It is comprised so that it can eject to 71 and burn.

As shown in FIG. 1, the mixed gas supply path 23 is branched into a first branch path 23a and a second branch path 23b, and the first branch path 23a is connected to the outer receiving port 94 as shown in FIG. The second branch path 23 b is connected to the inner receiving port 95.
The first branch path 23a is provided with a first intermittent valve Va for interrupting the flow of the mixed gas in the first branch path 23a, and the second branch path 23b is mixed in the second branch path 23b. A second intermittent valve Vb that interrupts the flow of gas is provided.

Then, when the first intermittent valve Va is opened and the second intermittent valve Vb is closed, the mixed gas flows through the outer ejection path 80e and is ejected into the combustion space 71. This outer ejection path 80e is used for operation. It becomes the ejection path 80.
Alternatively, when the first intermittent valve Va is closed and the second intermittent valve Vb is opened, the mixed gas flows through the inner ejection path 80i and is ejected into the combustion space 71. This inner ejection path 80i is used for operation. It becomes the ejection path 80.
That is, the ejection path switching means 84 is configured by the first intermittent valve Va and the second intermittent valve Vb.

Next, a description will be given of the configuration of portions other than the reformer R in the hydrogen-containing gas generator P.
As shown in FIG. 8 and FIG. 9, the water vapor generating part J includes a heating exhaust gas flow part 3 that allows the combustion gas of the reforming burner 8 discharged from the combustion part 7 to flow, and the heating exhaust gas flow. And an evaporation processing unit 2 that evaporates the reforming water by heating by the unit 3 to generate water vapor.

  Furthermore, in this hydrogen-containing gas generating device P, heat exchange for the raw fuel after desulfurization is performed in which the raw fuel gas after desulfurization desulfurized in the desulfurization unit 1 by the high-temperature reformed gas discharged from the reforming unit 6 is heated. Ea, raw heat exchanger Eb before desulfurization for heating raw fuel gas desulfurized in desulfurization section 1 by reformed gas after heat exchange in desulfurized raw fuel heat exchanger Ea, and heating There is provided a cooling exhaust gas flow part 37 for allowing the combustion gas discharged from the exhaust gas flow part 3 to flow and cooling the metamorphic part 4 with the combustion gas.

  After desulfurization, the raw fuel heat exchanger Ea is desulfurized in the desulfurization section 1 by the upstream heat exchange flow section 38 through which the reformed gas discharged from the reforming section 6 flows, and the reforming section 6. The desulfurized raw fuel flow section 39 for allowing the desulfurized raw fuel gas to be supplied to the exhaust gas is provided so as to be capable of exchanging heat, and the undesulfurized raw fuel heat exchanger Eb is provided with an upstream heat exchange flow Heat exchange between the downstream heat exchange flow section 40 through which the reformed gas discharged from the section 38 flows and the raw fuel flow section 41 before desulfurization through which the raw fuel gas desulfurized in the desulfurization section 1 flows. It is provided and configured freely.

As shown in FIG. 9, among the parts constituting the hydrogen-containing gas generating device P, each part other than the reformer R is configured using a plurality of flat containers B that form a processing space S for processing a fluid. Has been.
Then, the hydrogen-containing gas generation device P arranges the reformer R and the plurality of containers B in a stacked manner in the container alignment direction along the horizontal direction with the reformer R positioned in the middle. It is configured by pressing B by pressing means (not shown) from both sides of the container arrangement direction.
Each container B is made of a heat-resistant metal such as stainless steel, and in each container B, a plurality of processing spaces S are partitioned by a heat transfer plate (not shown) so as to be able to transfer heat to each other. It is formed side by side.

In this embodiment, the hydrogen-containing gas generator P is configured using five containers B. In addition, in order to clarify the distinction between the five containers B, for the sake of convenience, symbols 1, 2, 3,... 5 indicating the arrangement order from the left in FIG. .
Incidentally, the reformer R is disposed between the leftmost container B1 and the second container B2 from the left.

As shown in FIG. 9, the leftmost container B1 includes two processing spaces S, the exhaust gas flow passage 3 for heating is configured in the left processing space S, and the meandering evaporation is performed in the right processing space S. A processing unit 2 is configured. That is, the water vapor generating part J is configured by the leftmost container B1.
In addition, an auxiliary heating electric heater 42 is provided for auxiliary heating of the evaporation processing unit 2 at the time of start-up or the like while being applied to the side surface of the leftmost container B1 on the evaporation processing unit 2 side.

  The second container B2 from the left is provided with two processing spaces S, the upstream processing space S is constituted by the upstream processing space S, and the raw fuel flow after desulfurization is performed in the right processing space S. A flow part 39 is configured. That is, the desulfurized raw fuel heat exchanger Ea is configured by the second container B2 from the left. Auxiliary heating electricity for auxiliary heating of the desulfurized raw fuel flow-through section 39 at the time of start-up or the like in the state of being applied to the side surface of the second desulfurized raw fuel flow section 39 in the second container B2 from the left A heater 42 is provided.

The third container B3 from the left includes four processing spaces S. The third chamber from the left, the second chamber from the left, and the processing space S at the left end are adjacent to each other so that fluid can flow in the order of description. It is communicated.
The raw fuel flow passage 41 before desulfurization is configured in the third processing space S from the left, and each of the second processing chamber and the leftmost processing space S from the left has a desulfurization catalyst 43 for desulfurizing the raw fuel gas. The desulfurization unit 1 is filled and the rightmost processing space S is filled with an iron oxide-based or copper-zinc-based conversion catalyst 44 that converts carbon monoxide gas into carbon dioxide gas using water vapor. 4 is configured.
Incidentally, although details will be described later, since the transformation section 4 constituted by the third container B3 from the left is the first stage and the transformation section 4 is provided in four stages, the third container from the left will be described below. The metamorphic part 4 configured by B3 may be referred to as the first stage metamorphic part 4.

The third processing space S from the left that constitutes the raw fuel flow passage 41 before desulfurization and the rightmost processing space S that constitutes the first-stage metamorphic portion 4 transfer heat through a heat transfer plate (not shown). The raw fuel gas to be desulfurized flowing through the raw fuel flow passage 41 before desulfurization and the reformed gas to be subjected to shift treatment flowing through the first stage shift section 4 are configured to exchange heat. ing.
In other words, the first-stage shift section 4 is configured to be used also as the downstream heat exchange flow section 40, and is used downstream by the raw fuel flow section 41 before desulfurization and the first-stage shift section 4. A heat exchanger Eb for raw fuel before desulfurization is configured by the side heat exchange flow part 40.

And the desulfurization part 1 comprised in the process space S of the 2nd chamber from the left is made into the 1st step, the desulfurization part 1 comprised in the process space S of the left end is made into the 2nd step, and the raw fuel gas to be desulfurized is After the pre-desulfurization raw fuel flow part 41 is passed and preheated, each desulfurization part 1 is made to flow through in order of the first stage and the second stage for desulfurization treatment.
An auxiliary heating electric heater 42 for assisting heating of the transformation section 4 at the time of start-up or the like is provided in a state of being applied to the side face of the third container B3 from the left side on the transformation section 4 side.

  The fourth container B4 from the left includes four processing spaces S, and the leftmost processing space S is configured as a cooling exhaust gas flow passage 37. The second processing chamber S3, the third processing chamber S, and the rightmost processing space S from the left. Are adjacent to each other so that fluids can flow in the order of description, and are filled in the shift catalyst 44 to form the shift section 4.

The transformation section 4 configured in the processing space S in the second chamber from the left is the second stage, the transformation section 4 configured in the processing space S in the third chamber from the left is the third stage, and the processing space at the right end. The transformation section 4 configured by S is the fourth stage, and an external gas processing flow path 45 is provided from the first stage transformation section 4 configured by the third container B3 from the left to the second stage transformation section 4. The reformed gas is supplied at, and the reformed gas is caused to flow through each of the transforming sections 4 in the order of the second, third, and fourth stages, and the modification process is performed.
In addition, an auxiliary heating electric heater 42 for assisting heating of the transforming portion 4 at the time of start-up or the like is provided in a state of being applied to the side surface of the fourth stage transforming portion 4 side in the fourth container B4 from the left. It has been.

  Incidentally, in the shift unit 4, carbon monoxide and water vapor in the reformed gas supplied from the reforming unit 6 are converted at a shift processing temperature in the range of 150 to 400 ° C. by the catalytic action of the shift catalyst 44. The metamorphic reaction is performed below.

The fifth container from the left, that is, the rightmost container B5, has two processing spaces S, the left processing space S is used for heat transfer adjustment without any use, and the right processing space S is carbon monoxide. The selective oxidation unit 5 is configured by filling a selective oxidation catalyst 46 of a noble metal such as platinum, ruthenium, rhodium or the like that selectively oxidizes gas.
Incidentally, in the selective oxidation unit 5, the carbon monoxide gas remaining in the reformed gas after the shift treatment under the selective oxidation treatment temperature of, for example, 80 to 150 ° C. is caused by the catalytic action of the selective oxidation catalyst 46. Selectively oxidized.

  The five containers B and the reformer R described above are arranged outside the leftmost container B1, between the leftmost container B1 and the reformer R, the reformer R and the second container B2 from the left. Between the second container B2 from the left and the third container B3 from the left, and between the third container B3 from the left and the fourth container B4 from the left. In a state where the material 47 is arranged, it is pressed from both sides of the container arranging direction by the pressing means, and is arranged in close contact with each other. Further, on the side of the rightmost container B5 constituting the selective oxidation unit 5, the container B5 A cooling blower 48 is provided so as to ventilate the air. Then, the selective oxidizer 5 is cooled by the cooling fan 48.

  Next, the connection form of the flow path to each container B or reformer R for supplying fluid to each container B or reformer R or discharging the fluid from each container B or reformer R will be described. To do. In each processing space S, the fluid is supplied from the upper part and flows downward and discharged from the lower part, or the fluid is supplied from the lower part and flows upward and supplied from the upper part. Since the fluid flows in the vertical direction so as to be discharged, each flow path is connected to the upper end portion or the lower end portion of each processing space S.

  The raw fuel gas supply path 31 is connected to the raw fuel flow section 41 before desulfurization, and the second stage desulfurization section 1 and the raw fuel flow section 39 after desulfurization are the raw fuel flow section 39 and reforming section after desulfurization. 6, the raw fuel gas inlet 19, the reformed gas outlet 20 of the reforming section 6 and the upstream heat exchange flow section 38, and the upstream heat exchange flow section 38 and the downstream heat exchange flow path. The first stage metamorphic section 4 that also serves as the flow section 40, the first stage metamorphic section 4 and the second stage metamorphic section 4, and the fourth stage metamorphic section 4 and the selective oxidation section 5 The selective oxidation unit 5 and the fuel gas supply unit of the fuel cell G are connected to each other through a gas processing channel 45 and a fuel gas channel 35.

  An ejector 49 for mixing water vapor into the raw fuel gas after desulfurization is provided in the gas processing flow path 45 that connects the second stage desulfurization unit 1 and the raw fuel flow portion 39 after desulfurization.

  A selective oxidation air supply path 51 to which selective oxidation air is supplied from a selective oxidation blower 50 is connected to the gas processing flow path 45 that connects the fourth stage shift section 4 and the selective oxidation section 5. Thus, the selective oxidation air is mixed with the reformed gas that has been subjected to the modification treatment in the modification unit 4 and supplied to the selective oxidation unit 5.

  The combustion gas outlet 21 of the combustion unit 7 and the heating exhaust gas flow part 3 are connected to the heating exhaust gas flow part 3 and the cooling exhaust gas flow part 37 through the combustion gas flow path 25, respectively. The combustion gas discharged from the combustion section 7 is configured to flow through the heating exhaust gas flow section 3 and the cooling exhaust gas flow section 37 in this order to be discharged.

  The reforming water supply path 33 is connected to the lower end of the evaporation processing unit 2, and the water vapor channel 52 that guides the water vapor generated in the evaporation processing unit 2 by heating by the heating exhaust gas flow unit 3 is provided in the ejector 43. It is connected.

  That is, the raw fuel gas is desulfurized in the first-stage and second-stage desulfurization sections 1, and the steam that is generated in the evaporation processing section 2 and supplied through the steam flow path 52 to the desulfurized raw fuel gas. Are mixed in the ejector 49, and the raw fuel gas mixed with the water vapor is reformed in the reforming section 6, and the reformed gas is treated in the first, second, third, fourth. A shift treatment is performed in the shift unit 4, and the reformed reformed gas is selectively oxidized in the selective oxidation unit 5 to generate a hydrogen-containing gas having a low carbon monoxide concentration. The hydrogen-containing gas is used as a fuel gas. It is configured to be supplied to the fuel cell G through the fuel gas channel 35.

Next, the control operation of the operation control unit C will be briefly described.
The operation control unit C is configured using a microcomputer or the like, and controls operations of the hydrogen-containing gas generation device P including the reformer R, the fuel cell G, and the like by executing a predetermined control program. It is configured as follows.
In the normal operation in which the operation control unit C generates a hydrogen-containing gas in an amount corresponding to the power generation output of the fuel cell G and supplies it to the fuel cell G, one of the outer ejection path 80e and the inner ejection path 80i is used for operation. In order to control the injection path 80, the supply path switching means 84 is controlled, and the supply amount of the raw fuel gas and the supply amount of reforming water are adjusted according to the power generation output of the fuel cell G, respectively. The blower 32 and the reforming water pump 34 are controlled.
In addition, in the normal operation, the operation control unit C supplies the combustion gas fuel to the reforming burner 8 so that the temperature detected by the reforming unit temperature sensor 26 becomes a predetermined temperature for reforming. The combustion fuel blower 10 is controlled in order to adjust the amount of fuel, and the amount of combustion air supplied to the reforming burner 8 is adjusted to an amount corresponding to the amount of combustion gas fuel supplied to the reforming burner 8. In order to adjust, the combustion air blower 12 is controlled. That is, the operation control unit C controls the combustion air blower 12 under steady operating conditions for setting the amount of combustion air supplied to the reforming burner 8 to an amount corresponding to the amount of fuel gas fuel supplied. It will be.

According to the power generation output of the fuel cell G, the supply amount of off-gas as combustion gas fuel supplied to the reforming burner 8 through the off-gas passage 24 is known, and based on the control information of the combustion fuel blower 10, The supply amount of the combustion gas fuel supplied by the fuel blower 10 is known.
Therefore, according to the supply amount of off gas supplied to the reforming burner 8 and the supply amount of combustion gas fuel by the combustion fuel blower 10, the amount of combustion air for completely burning them is obtained. The combustion air amount derivation information is preset by map information or the like and stored in the storage unit of the operation control unit C.
Then, the operation control unit C corresponds to the supply amount of the off gas supplied to the reforming burner 8 and the supply amount of the combustion gas fuel by the combustion fuel blower 10 based on the combustion air amount derivation information. The combustion air blower 12 is controlled so as to determine the supply amount of the combustion air and supply the calculated supply amount of combustion air.

Next, the reforming apparatus diagnosis method and diagnosis apparatus according to the present invention will be described.
In the reforming apparatus diagnosis method according to the present invention, when the state in which the carbon monoxide concentration in the combustion gas of the reforming burner 8 detected by the CO concentration sensor 27 is higher than a predetermined upper limit value continues for a set time, After performing the ejection path changing process of operating the path switching means 84 to change the operational ejection path 80, the CO concentration sensor 27 detects the carbon monoxide concentration in the combustion gas, and based on the detection result. Diagnose the abnormality.
In this embodiment, as shown in FIG. 1, FIG. 8, and FIG. 9, there is provided a diagnostic device A that executes the diagnostic method for a reformer according to the present invention, and the diagnostic device A includes the above-described CO concentration sensor 27. And the ejection path switching means 84 and the detection information of the CO concentration sensor 27, if it is determined that the CO generation abnormality in which the carbon monoxide concentration in the combustion gas is higher than the predetermined upper limit continues for a set time, After the ejection path change processing means C1 for executing the ejection path change processing for operating the path switching means 84 to change the ejection path 80 for operation, and the ejection path change processing means C1, the ejection route change processing is executed. Based on the carbon monoxide concentration in the combustion gas detected by the CO concentration sensor 27, a diagnosis means C2 for diagnosing an abnormality is provided.
The ejection route change processing means C1 and the diagnosis means C2 are configured using an operation control unit C.

The ejection path changing process will be specifically described. When the first intermittent valve Va is opened, the second intermittent valve Vb is closed, and the outer ejection path 80e is the ejection path 80 for operation, the first intermittent valve Va is closed, the second intermittent valve Vb is opened, and the operation ejection path 80 is changed to the inner ejection path 80i.
On the contrary, when the first intermittent valve Va is closed and the second intermittent valve Vb is opened and the operation ejection path 80 is the inner ejection path 80i, the first intermittent valve Va is opened and the second intermittent valve is opened. Vb is closed, and the outer ejection path 80e is changed to the operation ejection path 80.

  In this embodiment, when the ejection path change processing means C1 determines that the occurrence of CO is abnormal based on the detection information of the CO concentration sensor 27, the operating condition of the combustion air blower 12 is changed to the combustion air to the reforming burner 8. From the steady operating conditions for setting the supply amount according to the supply amount of the combustion gas fuel, the combustion air supply amount to the reforming burner 8 is increased from the amount according to the supply amount of the combustion gas fuel. After changing to the diagnostic operating condition to be performed, if it is determined that the carbon monoxide concentration in the combustion gas is equal to or lower than the upper limit value based on the detection information of the CO concentration sensor 27, the combustion is determined to be resolved. When the ejection path change process in the steady state is executed by operating the air blower 12 under normal operating conditions and the ejection path change process is performed, and it is determined that the occurrence of CO is abnormal based on the detection information of the CO concentration sensor 27 , The firing air blower 12 is operated under diagnostic operating conditions to execute the ejection path changing process, and the ejection path changing process in the combustion air increasing state (an example of the oxygen-containing gas increasing state) is executed. Yes.

  Further, when the diagnosis unit C2 determines that the occurrence of CO generation is resolved based on the detection information of the CO concentration sensor 27 when the ejection route change processing in the steady state is executed by the ejection route change processing unit C1, When it is diagnosed that the reforming burner 8 is abnormal and it is determined that the CO generation abnormality is detected based on the detection information of the CO concentration sensor 27, a slight abnormality of the combustion air blower 12 or an abnormal off-gas composition is detected. When it is diagnosed that there is, and when the ejection path change processing in the increased combustion air state is executed by the ejection path change processing means C1, it is determined that the CO generation abnormality is resolved based on the detection information of the CO concentration sensor 27. When it is diagnosed that the reforming burner 8 is abnormal and it is determined that CO generation is abnormal based on the detection information of the CO concentration sensor 27, the supply of combustion fuel by the combustion fuel blower 10 is stopped. When it is determined that the CO generation abnormality is resolved based on the detection information of the CO concentration sensor 27, it is diagnosed that the combustion fuel blower 10 is abnormal, and the CO generation abnormality is determined based on the detection information of the CO concentration sensor 27. In this case, the combustion air blower 12 is diagnosed as having a serious abnormality.

Next, a control operation in the abnormality diagnosis control of the diagnostic apparatus A for executing the diagnostic method according to the present invention will be described based on the flowchart shown in FIG.
If the ejection path change processing means C1 determines that the occurrence of CO is abnormal based on the detection information of the CO concentration sensor 27, after changing the operating condition of the combustion air blower 12 from the steady operating condition to the diagnostic operating condition, the CO concentration sensor Based on the detected information of 27, it is determined whether the CO occurrence abnormality or the CO occurrence abnormality is resolved (steps # 1 to # 3). If it is determined in step # 3 that the CO generation abnormality has been resolved, the operating condition of the combustion air blower 12 is changed from the diagnostic operating condition to the steady operating condition, and then the ejection path changing process is executed. On the other hand, if it is determined in step # 3 that the occurrence of CO is abnormal, the ejection path changing process is executed while the combustion air blower 12 is operated under the diagnostic operating conditions, and combustion is performed. The ejection route changing process in the air increase state is executed (steps # 4, 5, 12).

After the ejection route change processing means C1 executes the ejection route change processing in the steady state in step # 5, the diagnostic means C2 determines whether the CO occurrence abnormality is detected or not based on the detection information of the CO concentration sensor 27 in step # 6. Determine whether the occurrence abnormality is resolved.
If it is determined in step # 6 that the CO generation abnormality is resolved, it is diagnosed that the reforming burner 8 is abnormal, the diagnosis result is stored in the storage unit (steps # 7, 8), and the process returns. That is, the operation is continued in a state in which the carbon monoxide concentration in the combustion gas is suppressed to the upper limit value or less by changing the operation ejection path 80 of the reforming burner 8.
On the other hand, if it is determined in step # 6 that the occurrence of CO is abnormal, it is diagnosed as a slight abnormality in the combustion air blower 12 or an off-gas composition abnormality, and the diagnosis result is stored in the storage unit. Based on the diagnosis result, the output of the combustion air blower 12 is increased until the carbon monoxide concentration in the combustion gas detected by the CO concentration sensor 27 is below the upper limit for a set time (step). # 9-11) Return. That is, the operation is continued in a state where the carbon monoxide concentration in the combustion gas is suppressed to the upper limit value or less.

When the ejection route change processing means C1 executes the ejection route change processing in the combustion air increasing state in step # 12, the diagnosis means C2 determines whether the CO generation abnormality is detected based on the detection information of the CO concentration sensor 27 in step # 13. It is determined whether CO generation abnormality is resolved.
If it is determined in step # 13 that the CO generation abnormality has been resolved, it is diagnosed that the reforming burner 8 is abnormal, the diagnosis result is stored in the storage unit (steps # 7, 8), and the process returns. That is, the operation is continued in a state in which the carbon monoxide concentration in the combustion gas is suppressed to the upper limit value or less by changing the operation ejection path 80 of the reforming burner 8.

If it is determined in step # 13 that the CO generation abnormality has occurred, the diagnosis unit C2 stops the combustion fuel blower 10 and then determines whether the CO generation abnormality or the CO generation abnormality has been resolved based on the detection information of the CO concentration sensor 27. (Steps # 14 and 15).
If it is determined in step # 15 that the CO generation abnormality is resolved, the abnormality of the combustion fuel blower 10 is diagnosed, the diagnosis result is stored in the storage unit and displayed on the display unit D, and the operation control unit C Based on the diagnosis result, the operation of the hydrogen-containing gas generator P and the fuel cell G is stopped (steps # 16 and 17).
If it is determined in step # 15 that the occurrence of CO is abnormal based on the detection information of the CO concentration sensor 27, it is diagnosed that the combustion air blower 12 is seriously abnormal, and the diagnosis result is stored in the storage unit and displayed on the display unit D. Then, the operation control unit C stops the operation of the hydrogen-containing gas generation device P and the fuel cell G based on the diagnosis result (steps # 18 and 19).

  The diagnosis result stored in the storage unit of the operation control unit C can be displayed on the display unit B by operating an operation unit (not shown) for displaying the diagnosis result.

That is, when it is diagnosed by the diagnostic unit C2 that the reforming burner 8 is abnormal, the operation control unit C changes the ejection path 80 for operation of the reforming burner 8 in a state where the reforming apparatus R has changed. It is configured to continue driving.
When the diagnosis means C2 diagnoses a slight abnormality in the combustion air blower 12 or an off-gas composition abnormality, the operation control unit C sets the carbon monoxide concentration in the combustion gas to be equal to or lower than the upper limit value. The operation of the reformer R is continued in a state where the combustion air blower 12 is operated.
When the diagnosis means C2 diagnoses that the combustion fuel blower 10 is abnormal or the combustion air blower 12 is seriously abnormal, the operation control unit C stops the operation of the reformer R and displays the diagnosis result. It is configured to be displayed on part D.

If the cause of the CO generation abnormality is in the reforming burner 8 and the CO generation abnormality is resolved by changing the operation ejection path 80, the operation is continued with the operation ejection path 80 changed. Is done.
Further, the cause of the CO generation abnormality is a slight abnormality such as a slight pulsation in the combustion air blower 12 or an off-gas composition abnormality, and the output of the combustion air blower 12 is increased to increase the supply amount of the combustion air. Even when the CO generation abnormality is resolved by slightly increasing the value, the operation is continued with the output of the combustion air blower 12 increased.
That is, the cause of the CO generation abnormality is an abnormality of the reforming burner 8, a minor abnormality of the combustion air blower 12, or an off-gas composition abnormality, and the change of the operation ejection path 80 or the combustion air blower 12. When the CO generation abnormality is resolved due to the increase in the output, the operation of the reformer R is continued in a state in which measures are automatically taken to eliminate the CO generation abnormality.

On the other hand, the cause of the CO generation abnormality is a serious abnormality such as a severe pulsation in the combustion air blower 12 or a decrease in output, or an abnormality such as a pulsation in the combustion fuel blower 10, and the CO generation abnormality is not solved. In this case, the diagnosis result is displayed on the display unit D, and the operation of the reformer R is stopped.
Therefore, since an abnormal location is known based on the diagnosis result displayed on the display unit D, maintenance can be performed promptly.

[Second Embodiment]
Hereinafter, although 2nd Embodiment of this invention is described, this 2nd Embodiment demonstrates another embodiment of the ejection path | route of the reformer burner 8, and the structure of the other hydrogen containing gas production | generation apparatus P is demonstrated. Is the same as in the first embodiment. Accordingly, the same constituent elements as those in the first embodiment and the constituent elements having the same action are denoted by the same reference numerals in order to avoid duplicate description, and the reforming burner 8 will be mainly described.

As shown in FIGS. 4-6, in this 2nd Embodiment, the reforming burner 8 is comprised from the 1st burner part 8a and the 2nd burner part 8b of the mutually same structure.
Each of the first burner portion 8a and the second burner portion 8b includes a disk-shaped nozzle portion 96 that ejects a mixed gas, and a flow path forming body 97 that guides the mixed gas received by the receiving portion 81 to the nozzle portion 96. Configured.

The nozzle portion 96 is formed with a plurality (eight in this embodiment) of ejection holes 98 arranged in an annular shape at equal intervals as the ejection portions 83.
The flow path forming body 97 is configured in a bottomed cylindrical shape, and the inside thereof is configured as the ejection flow path 82, and the reception port 99 is attached to the bottom portion of the flow path forming body 97 as the reception section 81 in communication with the ejection flow path 82. Yes.
Then, with the plurality of ejection holes 96 communicating with the ejection flow path 82 inside the flow path forming body 97, the nozzle portion 96 is attached to the tip opening of the flow path forming body 97 by welding, whereby the first burner The part 8a and the second burner part 8b are configured.

That is, the ejection path 80 is configured by each of the first burner part 8a and the second burner part 8b, and in the second embodiment, the first burner part 8a and the second burner part 8b are provided as the ejection path 80. Yes.
Each of the first burner 8a and the second burner 8b ejects the combustion gas fuel necessary for heating the reforming catalyst 61 into the combustion space 71 so that the reforming process can be appropriately performed. And can be burned.

The apparatus main body 13 of the reformer R is the same as that in the first embodiment, and the first burner portion 8a and the second burner portion 8b are provided side by side on the upper plate 16 of the apparatus main body 13.
Similar to the first embodiment, the mixed gas supply path 23 is branched into a first branch path 23a and a second branch path 23b, and the first branch path 23a is connected to the receiving port 99 of the first burner portion 8a. The second branch path 23b is connected to the receiving port 99 of the second burner portion 8b.
Similarly to the first embodiment, the first branching path 23a is provided with the first interrupting valve Va, and the second branching path 23b is provided with the second interrupting valve Vb.

When the first intermittent valve Va is opened and the second intermittent valve Vb is closed, the mixed gas flows through the ejection path 80 of the first burner portion 8a and is ejected into the combustion space 71. This first burner The ejection path 80 of the part 8a becomes the ejection path 80 for operation.
Alternatively, when the first intermittent valve Va is closed and the second intermittent valve Vb is opened, the mixed gas flows through the ejection path 80 of the second burner portion 8b and is ejected into the combustion space 71. This second burner The ejection path 80 of the part 8b becomes the ejection path 80 for operation.
That is, the ejection path switching means 84 is configured by the first intermittent valve Va and the second intermittent valve Vb.

Similar to the first embodiment, the diagnostic apparatus A includes the CO concentration sensor 27, the ejection path switching means 84, the ejection path change processing means C1, the diagnostic means C2, and the like. The same diagnostic method is configured to be executed.
Since the control operation in the abnormality diagnosis control of the diagnosis apparatus A is the same as that described based on the flowchart shown in FIG. 7 in the first embodiment, the description thereof is omitted.

[Another embodiment]
Next, another embodiment will be described.
(A) The specific configuration of the reformer R is not limited to the configurations described in the first and second embodiments. For example, the reformer R may be configured using a container B having two processing spaces S similar to those in the first embodiment. That is, the reforming unit 6 is configured using one processing space S of the container B, and the combustion unit 7 is configured using the other processing space S.

(B) The specific configuration (shape, etc.) of the reforming burner 8 is not limited to the configuration described in each of the first and second embodiments.
The specific configuration of the ejection path 80 is not limited to the configuration described in the first and second embodiments, and can be configured according to the configuration of the reforming burner 8. Further, three or more ejection paths may be provided.

(C) In each of the first and second embodiments, the combustion gas fuel (combustion gas fuel and off-gas from the combustion fuel blower 10) and the combustion air blower 12 are provided in the receiving portion 81 of the ejection path 80. A mixed gas mixed with combustion air from was supplied. Instead of this, only the combustion gas fuel may be supplied to the receiving portion 81 of the ejection path 80. In this case, the reforming burner 8 is provided with a combustion air ejection path corresponding to each of the plurality of ejection paths 80 or a combustion air ejection path common to the plurality of ejection paths 80.

(D) In each of the first and second embodiments described above, when it is determined that the occurrence of CO is abnormal based on the detection information of the CO concentration sensor 27, first, the operating condition of the combustion air blower 12 is changed from the steady operating condition to the diagnostic one. Although it changed to the operating condition and it was set as the structure which performs an ejection path | route change process after that, if it determines with CO generation | occurrence | production abnormality based on the detection information of the CO density | concentration sensor 27, changing the operating condition of the combustion air blower 12 will be changed. Alternatively, the ejection path changing process may be executed.
In this case, if it is determined that the CO generation abnormality is resolved based on the detection information of the CO concentration sensor 27 after the ejection route change processing, the reformer burner 8 is diagnosed as abnormal and based on the detection information of the CO concentration sensor 27. If it is determined that the occurrence of CO is abnormal, it may be determined that an abnormality other than the reforming burner 8 is determined.
Further, when it is determined that there is an abnormality other than the reforming burner 8, the operating condition of the combustion air blower 12 is changed from a steady operating condition to a diagnostic operating condition, or the combustion fuel blower 10 is stopped. Further, the location of the abnormality may be diagnosed based on the determination result of whether the CO generation abnormality is canceled or the CO generation abnormality is canceled based on the detection information of the CO concentration sensor 27.

(E) The specific configurations of the combustion fuel supply means and the oxygen-containing gas supply means are not limited to the blowers exemplified in the first and second embodiments, and may be pumps, for example.

(F) The specific configuration of the ejection path switching means 84 is limited to a configuration including two on-off valves, the first on-off valve Va and the second on-off valve Vb, as in the first and second embodiments. For example, a three-way valve may be used.

  As described above, it is possible to provide a diagnostic method and a diagnostic apparatus for a reforming apparatus that can appropriately diagnose at least an abnormality of the reforming burner.

6 Reforming unit 7 Combusting unit 8 Reforming burner 10 Combustion fuel blower (combustion fuel supply means)
12 Combustion air blower (oxygen-containing gas supply means)
27 CO concentration sensor (carbon monoxide concentration detection means)
61 reforming catalyst 71 combustion space 80 ejection path 81 receiving part 82 ejection channel 83 ejection part 84 ejection path switching means A diagnostic device C1 ejection path change processing means C2 diagnostic means G fuel cell R reforming apparatus W partition

Claims (5)

The reforming section in which the reforming catalyst is charged and the combustion section that forms a combustion space therein are arranged in a state of being partitioned by heat transferable partition walls,
A reforming burner provided in the combustion section is provided with a reforming burner for burning the combustion fuel supplied by the combustion fuel supply means in the combustion space with the combustion oxygen-containing gas supplied by the oxygen-containing gas supply means. A method for diagnosing a reformer for diagnosing an abnormality in a quality device,
The reforming burner has an ejection path from the combustion fuel receiving section from the combustion fuel supply means to the ejection section with respect to the combustion space via the ejection flow path, the receiving section, the ejection Provided with a plurality of flow paths and different ejection parts,
An ejection path switching means capable of selectively switching an operation ejection path which is the ejection path for ejecting the combustion fuel from the combustion fuel supply means to the combustion space from the plurality of ejection paths;
When the carbon monoxide concentration in the combustion gas of the reforming burner is higher than a predetermined upper limit value,
After performing the ejection path change process for operating the ejection path switching means to change the ejection path for operation, the carbon monoxide concentration in the combustion gas is detected, and an abnormality is diagnosed based on the detection result Method for diagnosing reformer to perform. When the concentration of carbon monoxide in the combustion gas becomes higher than the upper limit value, the operating condition of the oxygen-containing gas supply means, the supply amount of combustion oxygen-containing gas to the reforming burner, and the supply amount of combustion fuel Was changed from a steady operating condition to an amount according to the condition to a diagnostic operating condition in which the amount of combustion oxygen-containing gas supplied to the reforming burner was increased more than the amount corresponding to the amount of fuel supplied. rear,
When the concentration of carbon monoxide in the combustion gas is less than or equal to the upper limit value,
Performing the ejection path changing process in a steady state by operating the oxygen-containing gas supply means under the steady operating conditions and executing the ejection path changing process;
When the carbon monoxide concentration in the combustion gas is higher than the upper limit,
The diagnosis of the reforming apparatus according to claim 1, wherein the ejection path changing process in an oxygen-containing gas increasing state is executed in which the oxygen-containing gas supply means is operated under the diagnostic operating condition to execute the ejection path changing process. Method. When executing the ejection route change process in the steady state,
When the carbon monoxide concentration in the combustion gas is equal to or lower than the upper limit value, it is diagnosed that the reforming burner is abnormal, and the carbon monoxide concentration in the combustion gas is higher than the upper limit value. Is diagnosed as a minor abnormality of the oxygen-containing gas supply means,
When performing the ejection path changing process in the oxygen-containing gas increased state,
When the carbon monoxide concentration in the combustion gas is equal to or lower than the upper limit value, it is diagnosed that the reforming burner is abnormal, and the carbon monoxide concentration in the combustion gas is higher than the upper limit value. The diagnosis method for a reformer according to claim 2, wherein a diagnosis is made of a serious abnormality of the oxygen-containing gas supply means or an abnormality of the combustion fuel supply means. The reformed gas mainly composed of hydrogen gas generated in the reforming unit is configured to be supplied to the fuel cell,
Off gas discharged in a state where hydrogen remains from the fuel cell is configured to be supplied to the reforming burner as the combustion fuel,
If the carbon monoxide concentration in the combustion gas is higher than the upper limit value when performing the ejection path changing process in the steady state, a slight abnormality in the oxygen-containing gas supply means, or the off-gas Diagnosed as an abnormal composition,
If the carbon monoxide concentration in the combustion gas is higher than the upper limit value when the ejection path changing process in the oxygen-containing gas increasing state is performed, the combustion fuel supply means supplies the combustion fuel. Stop,
When the carbon monoxide concentration in the combustion gas is equal to or lower than the upper limit value, it is diagnosed that the combustion fuel supply means is abnormal, and the carbon monoxide concentration in the combustion gas is higher than the upper limit value. The diagnosis method for a reformer according to claim 3, wherein the diagnosis is that the oxygen-containing gas supply means is seriously abnormal. The reforming section in which the reforming catalyst is charged and the combustion section that forms a combustion space therein are arranged in a state of being partitioned by heat transferable partition walls,
A reforming burner provided in the combustion section is provided with a reforming burner for burning the combustion fuel supplied by the combustion fuel supply means in the combustion space with the combustion oxygen-containing gas supplied by the oxygen-containing gas supply means. A reformer diagnostic device for diagnosing abnormalities in the quality device,
The reforming burner has an ejection path from the combustion fuel receiving section from the combustion fuel supply means to the ejection section with respect to the combustion space via the ejection flow path, the receiving section, the ejection A plurality of flow paths and the ejection parts are provided in different states,
Carbon monoxide concentration detection means for detecting the carbon monoxide concentration in the combustion gas of the reforming burner;
An ejection path switching means capable of selectively switching an operation ejection path which is the ejection path for ejecting the combustion fuel from the combustion fuel supply means to the combustion space from the plurality of ejection paths;
When the carbon monoxide concentration in the combustion gas detected by the carbon monoxide concentration detection means becomes higher than a predetermined upper limit value, the ejection that changes the operation ejection path by operating the ejection path switching means An ejection route change processing means for executing route change processing;
Diagnostic means for diagnosing an abnormality based on the carbon monoxide concentration in the combustion gas detected by the carbon monoxide concentration detection means after the ejection route change processing is executed by the ejection route change processing means; A reformer diagnostic apparatus provided with

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