JP2003036877A - Phosphoric acid type fuel cell power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high reliable phosphoric acid type fuel cell power generator in which the condition of the combustion flame of a burner in the furnace of a reformer is accurately watched. SOLUTION: The power generator has a flame temperature sensor 34 that measures the flame temperature of the burner 28 in the furnace of the reformer 27, a flame temperature collector 35 that collects the flame temperature in order measured with the flame temperature sensor 34, and a flame temperature comparison section 36 that compares the flame temperature that collected in order at the flame temperature collector 35 with the standard value of the temperature that is preliminary determined for judging the burning and fading of the burner 28. The supply of source fuel is stopped when the flame temperature is lower than that of the standard value compared at the flame temperature comparison section 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phosphoric acid fuel cell power generator.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing the configuration of a conventional phosphoric acid fuel cell power generator disclosed in, for example, Japanese Patent Laid-Open No. 9-63613. In the figure, 1 is a raw fuel supply means for supplying raw fuel, 2 is a raw fuel preheater for raising the temperature of the supplied raw fuel to an operating temperature of a desulfurizer described later, and 3 is hydrogen for sulfur content in the raw fuel. The desulfurizer 4 to be removed by using is a steam separator, and 5 is a steam ejector for sucking the raw fuel using the steam supplied from the steam separator 4 and mixing it with the steam.

Reference numeral 6 is a raw material preheater for preheating a mixed fluid of raw fuel and steam, 7 is a reformer for reacting the mixed fluid preheated by the raw material preheater 6 to generate a reformed gas containing hydrogen, 8 Is a burner provided in the furnace of the reformer 7, 9 is a flame detector for monitoring the combustion flame of the burner 8,
Reference numeral 10 is a CO shifter for converting carbon monoxide in the reformed gas generated by the reformer 7 into hydrogen to generate a shift gas, and 11 is hydrogen and air in the shift gas generated by the CO shifter 10. A fuel cell for reacting oxygen in the inside to generate electric power, which includes a fuel electrode 11a to which a shift gas is supplied, an air electrode 11b to which air is supplied, and a cooler 11c that releases heat generated during power generation. 12 is a line for supplying fuel to the burner 8, 1
Reference numeral 3 is a line for supplying fuel to a pilot burner (not shown) for ensuring the combustion stability of the burner 8, and 14 is a shutoff valve for stopping the supply of raw fuel from the raw fuel supply means 1.

Next, the operation of the phosphoric acid fuel cell power generator configured as described above will be described with reference to the drawings. Raw fuel consisting of city gas or natural gas supplied by the raw fuel supply means 1 is hydrogenated by a raw fuel preheater 2,
After the temperature is raised to a temperature (300 ° C. to 400 ° C.) suitable for the desulfurization reaction, it is guided to the desulfurizer 3 to remove the sulfur content in the raw fuel. A desulfurizer 3 is provided in order to poison the reforming catalyst in the reformer 7 provided downstream and reduce the reaction activity. Next, the desulfurized raw fuel is driven by the steam driving force supplied from the steam separator 4,
It is sucked by the steam ejector 5 and mixed with steam.

The raw fuel thus mixed with steam is heated to a temperature suitable for the reforming reaction in the raw material preheater 6 and introduced into the reformer 7. Then, a reforming gas containing hydrogen is generated by the reforming reaction in the reformer 7, and the reformed gas is cooled by the raw material preheater 6 and the raw fuel preheater 2 and then guided to the CO shift converter 10 and modified. Carbon monoxide in the gaseous substance is converted into hydrogen, is supplied to the fuel electrode 11a of the fuel cell 11, and reacts with oxygen in the air supplied to the air electrode 11b to generate electricity. Then, in the furnace of the reformer 7 during the operation, the flame detector 9 constantly measures the combustion flame of the burner 8 to monitor whether or not the reforming reaction is normally performed.

[0006]

The conventional phosphoric acid fuel cell power generator is constructed as described above, and the flame detector 9 constantly measures the combustion flame of the burner 8 to normally perform the reforming reaction. It is monitored whether or not there is, but as the flame detector 9, in general, a frame module that uses a conductive phenomenon of flame, an ultravision that uses ultraviolet rays emitted from the flame, and the like are used. When the frame module is used, since the frame module is constantly exposed to high temperature, depending on the installation position of the burner 8 and the direction of the flame, there is a risk of deformation due to the frame's own weight and erroneous measurement due to adhesion of oxide scale. , When using Ultravision, erroneous measurement occurs due to self-discharge of the sensor itself, and water not consumed by the fuel cell 11 during power generation operation. To burn rich off-gas reformer 7, since the measurement of the flame becomes difficult insufficient quantity of ultraviolet light becomes hydrogen combustion, reliability becomes inaccurate monitoring is disadvantageously lowered.

The present invention has been made to solve the above problems, and it is possible to accurately monitor the state of the combustion flame of the burner in the furnace of the reformer to improve the reliability. Another object of the present invention is to provide a phosphoric acid fuel cell power generator.

[0008]

A phosphoric acid fuel cell power generator according to claim 1 of the present invention comprises a raw fuel preheater for heating a supplied raw fuel to a temperature suitable for a desulfurization reaction, and a raw fuel preheat. Desulfurizer that removes the sulfur content in the raw fuel heated by the steam generator, steam separator that supplies steam, and the mixed gas that mixes the steam and raw fuel supplied from the steam separator with the reformed gas. The raw material preheater for raising the temperature, the reformer for heating the mixed gas heated by the raw material preheater to generate the reformed gas, the CO shifter for transforming the reformed gas into the shift gas, and the shift gas A fuel cell that generates power as fuel gas, cools the heat generated by power generation with cooling water, and circulates the heated cooling water through a steam separator, as well as the raw fuel for starting temperature rise and power generation during power generation operation. Burns reforming off-gas that does not contribute In a phosphoric acid fuel cell power generator equipped with a burner provided in the reformer furnace, a flame temperature sensor for measuring the flame temperature of the burner and a flame temperature measured by the flame temperature sensor are sequentially collected. The flame temperature collecting unit and the flame temperature comparing unit that compares the flame temperature sequentially collected in the flame temperature collecting unit with a reference value of a preset temperature for determining the combustion / misfire of the burner are provided. The supply of the raw fuel is stopped when the flame temperature compared by the comparison unit is equal to or lower than the reference value.

Further, the phosphoric acid fuel cell power generator according to claim 2 of the present invention is heated by the raw fuel preheater for heating the supplied raw fuel to a temperature suitable for the desulfurization reaction, and the raw fuel preheater. Desulfurizer that removes sulfur from raw fuel, steam separator that supplies steam, and raw material that raises the temperature of the mixed gas that mixes steam and raw fuel supplied from the steam separator with reformed gas A preheater, a reformer that heats the mixed gas heated by the raw material preheater to generate a reformed gas, a CO shifter that shifts the reformed gas to a shift gas, and power generation using the shift gas as fuel gas The fuel cell is configured to circulate the heat generated by power generation with cooling water to raise the temperature of the cooling water and circulate it through the steam separator, and the raw fuel for startup temperature rise and reforming that does not contribute to power generation during power generation operation. Of the reformer to burn off-gas In a phosphoric acid fuel cell power generator having a burner provided inside, a flame temperature sensor that measures the flame temperature of the burner, and a flame temperature collection unit that sequentially collects the flame temperature measured by the flame temperature sensor, A flame temperature change amount calculation unit that calculates the time change amount of the flame temperature from the flame temperature sequentially collected in the flame temperature collection unit, and the time change amount of the flame temperature calculated by the flame temperature change amount calculation unit and the combustion of the burner. A flame temperature change amount comparison unit that compares a preset time change amount reference value to determine a misfire is provided,
The supply of the raw fuel is stopped when the time variation compared by the flame temperature variation comparing unit is less than or equal to the reference value.

Further, the phosphoric acid fuel cell power generator according to claim 3 of the present invention is heated by the raw fuel preheater for heating the supplied raw fuel to a temperature suitable for the desulfurization reaction and the raw fuel preheater. Desulfurizer that removes sulfur from raw fuel, steam separator that supplies steam, and raw material that raises the temperature of the mixed gas that mixes steam and raw fuel supplied from the steam separator with reformed gas A preheater, a reformer that heats the mixed gas heated by the raw material preheater to generate a reformed gas, a CO shifter that shifts the reformed gas to a shift gas, and power generation using the shift gas as fuel gas The fuel cell is configured to circulate the heat generated by power generation with cooling water to raise the temperature of the cooling water and circulate it through the steam separator, and the raw fuel for startup temperature rise and reforming that does not contribute to power generation during power generation operation. Of the reformer to burn off-gas In a phosphoric acid fuel cell power generator equipped with a burner provided inside, a pressure sensor that measures the pressure inside the furnace where the burner is installed, and a furnace that sequentially collects the pressure inside the furnace measured by the pressure sensor Calculated by the internal pressure collection unit, the internal pressure change calculation unit that calculates the temporal change amount of the internal pressure from the internal pressure sequentially collected by the internal pressure collection unit, and the internal pressure change calculation unit The in-reactor pressure change amount comparison unit that compares the in-reactor pressure change amount with time and the preset reference value of the in-reactor pressure change amount to determine burner combustion / misfire The supply of raw fuel is stopped when the pressure change amount compared by the comparison unit is equal to or less than the reference value.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1. 1 is a block diagram showing the configuration of a phosphoric acid fuel cell power generator according to Embodiment 1 of the present invention. In the figure, 21 is a raw fuel supply means for supplying raw fuel, 22 is a raw fuel preheater for raising the temperature of the supplied raw fuel to an operating temperature of a desulfurizer described later, and 23 is hydrogen for sulfur content in the raw fuel. Desulfurizer to be removed by using, 24 is a steam separator, 2
Reference numeral 5 is a steam ejector for sucking raw fuel using the steam supplied from the steam separator 24 and mixing it with steam, 26 is a raw material preheater for preheating a mixed fluid of raw fuel and steam, and 27 is this raw material preheater. A reformer 28 that reacts the mixed fluid preheated in 26 to generate a reformed gas containing hydrogen, and 28 is a burner provided in the furnace of the reformer 27.

Reference numeral 29 is a CO which converts carbon monoxide in the reformed gas produced by the reformer 27 into hydrogen to produce a modified gas.
A shifter 30 is a fuel cell for generating electricity by reacting hydrogen in the shift gas generated by the CO shifter 29 with oxygen in the air, and a fuel electrode 30a to which the shift gas is supplied and air to which air is supplied. The electrode 30b is provided with a cooler 30c that releases heat generated during power generation. Reference numeral 31 is a line for supplying fuel to the burner 28, 32 is a line for supplying fuel to a pilot burner (not shown) for ensuring the combustion stability of the burner 28, and 33 is raw fuel from the raw fuel supply means 21. It is a shutoff valve that stops the supply of.

Reference numeral 34 is a flame temperature sensor for measuring the flame temperature of the burner 28, 35 is a flame temperature collecting section for sequentially collecting the flame temperatures measured by the flame temperature sensor 34, and 36 is a sequential collection for the flame temperature collecting section. A flame temperature comparing unit that compares the flame temperature of the burner 28 with a reference value of a preset temperature for determining the combustion / misfire of the burner 28, and constitutes the flame temperature monitoring unit 37 together with the flame temperature collecting unit 35. When the flame temperature compared by the flame temperature comparison unit 35 is equal to or lower than the reference value, the shutoff valve 33 is output and the shutoff valve 33 is closed, and the supply of the raw fuel from the raw fuel supply means 21 is stopped.

Next, the operation of the phosphoric acid fuel cell power generator according to the first embodiment of the present invention configured as described above will be described with reference to the drawings. The raw fuel consisting of city gas or natural gas supplied by the raw fuel supply means 21 is hydrogenated by the raw fuel preheater 22 and heated to a temperature (300 ° C. to 400 ° C.) suitable for the desulfurization reaction, It is guided to the desulfurizer 23 and the sulfur content in the raw fuel is removed. A desulfurizer 23 is provided in order to poison the reforming catalyst in the reformer 27 provided downstream and reduce the reaction activity. Next, the desulfurized raw fuel is sucked by the steam ejector 25 by the driving force of the steam supplied from the steam separator 24 and mixed with the steam.

The raw fuel thus mixed with steam is heated to a temperature suitable for the reforming reaction in the raw material preheater 26 and introduced into the reformer 27. Then, a reforming gas containing hydrogen is generated by the reforming reaction in the reformer 27, and the reformed gas is cooled by the raw material preheater 26 and the raw fuel preheater 22 and then guided to the CO shift converter 29. The carbon monoxide in the quality gas is converted into hydrogen, and the fuel electrode 3 of the fuel cell 30
0a and reacts with oxygen in the air supplied to the air electrode 30b to generate electricity.

In the furnace of the reformer 27 during operation, the flame temperature of the burner 28 is measured by the flame temperature sensor 34, and the measured flame temperature is sequentially collected by the flame temperature collecting section 35. It Next, the flame temperature thus collected is compared in the flame temperature comparison unit 36 with a reference value of a temperature preset for determining the combustion / misfire of the burner 28, and the flame temperature is below the reference value. In this case, it is determined that a misfire has occurred, an output is made, the shutoff valve 33 is closed, and the supply of raw fuel from the raw fuel supply means 21 is stopped.

The flame temperature during power generation is usually 800.
The temperature is up to 1000 ° C. and changes depending on the operation variation, but during the power generation operation, hydrogen combustion is performed and the spontaneous ignition temperature of hydrogen is 550 ° C. Therefore, if the flame temperature is equal to or higher than the spontaneous ignition temperature, it can be determined that combustion is taking place, and therefore the reference value of the temperature for determining, for example, combustion / misfire is 6 in consideration of the margin.
It is set to 50 ° C.

As described above, according to the first embodiment, the flame temperature of the burner 28 is measured by the flame temperature sensor 34, and the measured flame temperatures are sequentially collected by the flame temperature collecting unit 35, and the flame temperature comparing unit is also provided. In 36, the collected flame temperature is compared with a reference value (650 ° C.) of the temperature set in advance to determine combustion / misfire, and if it is equal to or lower than the reference value, it is determined as misfire and the shutoff valve 33 is turned on. Since it is closed and the supply of the raw fuel is stopped, it becomes possible to accurately monitor the state of the combustion flame during the power generation operation of the burner 28, and it is possible to improve the reliability.

In the above description, the flame temperature monitoring means 37 is constituted by the flame temperature collecting section 35 and the flame temperature comparing section 36. However, the present invention is not limited to this, and the flame temperature collecting section 35 and the flame are not limited thereto. Needless to say, even if the temperature comparison units 36 are configured as independent means, the same effect can be exhibited.

Embodiment 2. 2 is a block diagram showing the configuration of a phosphoric acid fuel cell power generator according to Embodiment 2 of the present invention. In the figure, reference numerals 21 to 35 are the same as those in the first embodiment, and therefore, the same reference numerals are given and the description thereof is omitted. Reference numeral 38 is a flame temperature change amount calculation unit for calculating the time change amount of the flame temperature from the history of the flame temperature sequentially collected by the flame temperature collection unit 35, and 39 is the flame temperature calculated by the flame temperature change amount calculation unit 38. Of the flame temperature collecting unit 35 and the flame temperature collecting unit 35 for comparing the time change amount of the burner 28 with the reference value of the time change amount of the flame temperature preset for determining the combustion / misfire of the burner 28. The flame temperature monitoring means 40 is configured with the change amount calculation unit 38,
When the temporal change amount of the flame temperature compared by the flame temperature change amount comparing unit 39 is less than or equal to the reference value, it is output, the shutoff valve 33 is closed, and the supply of the raw fuel from the raw fuel supply means 21 is stopped. .

Next, regarding the operation of the phosphoric acid type fuel cell power generator according to Embodiment 2 of the present invention configured as described above, the hydrogen supplied to the fuel electrode 30a of the fuel cell 30 and the air electrode 30b are supplied. The process up to the point where the oxygen in the supplied air reacts to generate electric power is the same as in the first embodiment, and therefore description thereof is omitted, and the flame temperature monitoring means 39 is used.
Will be described. The flame temperature of the burner 28 is measured by the flame temperature sensor 34 in the furnace of the reformer 27 during the startup temperature raising operation, and the measured flame temperature is sequentially collected by the flame temperature collecting unit 35. Next, the flame temperature change amount calculation unit 38 calculates the time change amount of the flame temperature from the history of the collected flame temperature, and the flame temperature change amount comparison unit 39 further determines the combustion / misfire of the burner 28. Is compared with a reference value of the temporal change amount of the flame temperature set in advance, and if the temporal change amount of the flame temperature is less than or equal to the reference value, it is determined that a misfire has occurred and an output is made to shut off the shutoff valve 38.
Is closed, and the supply of raw fuel from the raw fuel supply means 21 is stopped.

The change in flame temperature during the startup temperature rise gradually rises from room temperature to about 800 ° C. in about 4 hours, and although the rising speed varies depending on the change in combustion conditions, the flame temperature changes with time. The amount of change is always positive. Therefore, it can be determined that combustion is taking place if the amount of change in flame temperature with time is positive. Therefore, the reference value of the amount of change in time for judging combustion / misfire is −0.5 ° C. / Sec is set.

As described above, according to the second embodiment, the flame temperature of the burner 28 is measured by the flame temperature sensor 34, and the measured flame temperatures are sequentially collected by the flame temperature collecting section 35, and at the same time, the flame temperature change amount is measured. The calculation unit 38 calculates the temporal change amount of the flame temperature from the collected history of the flame temperature, and the flame temperature change amount comparison unit 39 further determines the calculated temporal change amount of the flame temperature and the combustion / misfire in advance. The reference value of the amount of change over time (-0.5 ° C /
sec) and when it is less than the reference value, it is determined that a misfire has occurred and the shut-off valve 33 is closed to stop the supply of raw fuel, so that the combustion flame of the burner 28 at the time of starting temperature rise is It is possible to accurately monitor the state and improve reliability.

In the above, the flame temperature collecting unit 35, the flame temperature change amount calculating unit 38, and the flame temperature change amount comparing unit 39.
Although the case where the flame temperature monitoring means 40 is configured has been described above, the present invention is not limited to this, and the flame temperature collection unit 35, the flame temperature change amount calculation unit 38, and the flame temperature change amount comparison unit 39 are independent of each other. It goes without saying that the same effect can be obtained even if the device is configured as a means.

Embodiment 3. 3 is a block diagram showing the configuration of a phosphoric acid fuel cell power generator according to Embodiment 3 of the present invention. In the figure, reference numerals 21 to 33 are the same as those in the first embodiment, and therefore, the same reference numerals are given and the description thereof is omitted. Reference numeral 41 is a pressure sensor for measuring the in-furnace pressure of the reformer 27, 42 is an in-furnace pressure collecting unit that sequentially collects the in-furnace pressures measured by the pressure sensor 41, and 43 is this in-furnace pressure collecting unit 42. From the history of furnace pressure collected in
An in-furnace pressure change amount calculation unit that calculates the amount of time change in the in-furnace pressure, and 44 determines the amount of time change in the in-furnace pressure calculated by the in-furnace pressure change amount calculation unit 43 and the combustion / misfire of the burner 28. In order to do so, the in-reactor pressure change amount comparison unit that compares the preset in-reactor pressure change amount reference value with the in-reactor pressure collection unit 42 and the in-furnace pressure change amount calculation unit 43 When the time change amount of the in-reactor pressure compared by the in-furnace pressure change amount comparing unit 44 is equal to or less than the reference value, the shutoff valve 33 is output and the raw fuel supply means 2 is closed.
The supply of raw fuel from 1 is stopped.

Next, regarding the operation of the phosphoric acid fuel cell power generator according to Embodiment 3 of the present invention configured as described above, hydrogen supplied to the fuel electrode 30a of the fuel cell 30 and air supplied to the air electrode 30b will be described. The process up to the point where the oxygen in the supplied air reacts to generate electric power is the same as in the first embodiment, so description thereof will be omitted, and the flame monitoring means 45 will be described. During the startup temperature raising operation, the pressure inside the furnace of the reformer 27 is measured by the pressure sensor 41, and the measured pressure inside the furnace is sequentially measured by the pressure collecting unit 42 inside the furnace.
To be collected. Next, with respect to the collected in-furnace pressure, the in-furnace pressure change amount calculation unit 43 calculates the time-dependent change amount of the in-furnace pressure from the history, and further, the in-furnace pressure change amount comparison unit 44.
In comparison with the reference value of the time change amount of the furnace pressure set in advance in order to determine the combustion / misfire of the burner 28, if the time change amount of the furnace pressure is equal to or less than the reference value, it is determined to be a misfire. Is output, the shutoff valve 33 is closed, and the supply of the raw fuel from the raw fuel supply means 21 is stopped.

The change in the furnace pressure during the startup temperature rise gradually increases from the atmospheric pressure to about 500 mmAq in about 4 hours as the temperature in the furnace rises. The pressure in the furnace is determined by the flow rate and temperature of the combustion exhaust gas, and the change in the temperature of the combustion exhaust gas is the same as the change in flame temperature.The rate of rise in flame temperature fluctuates due to changes in combustion conditions, but there is always a tendency to rise. Therefore, the in-furnace pressure always tends to increase, and the temporal change amount of the in-furnace pressure is always positive. Therefore, it can be determined that combustion is taking place if the amount of temporal change in the furnace pressure is positive, and therefore the reference value of the amount of time change for determining combustion / misfire, for example, is −0.5 mmAq. / Sec is set.

As described above, according to the third embodiment, the pressure in the furnace of the reformer 27 is measured by the pressure sensor 41, and the measured pressure in the furnace is sequentially collected by the pressure collecting section 42 in the furnace. In the furnace pressure change amount calculation unit 43, the time change amount of the furnace pressure is calculated from the collected history of the furnace pressure,
Further, in the in-furnace pressure change amount comparison unit 44, the calculated temporal change amount of the in-furnace pressure and the reference value (−0.5 mmAq) of the temporal change amount set in advance to determine combustion / misfire.
/ Sec), and when it is less than the reference value, it is determined that a misfire has occurred and the shut-off valve 33 is closed to stop the supply of the raw fuel. It is possible to accurately monitor the state of and the reliability can be improved.

In the above, the in-furnace pressure collecting unit 42, the in-furnace pressure change amount calculating unit 43, and the in-furnace pressure change amount comparing unit 44 are used.
Although the case where the flame monitoring means 45 is configured has been described above, the present invention is not limited to this, and the in-furnace pressure collecting unit 4 is not limited to this.
It goes without saying that even if the in-furnace pressure change amount calculation unit 43 and the in-furnace pressure change amount comparison unit 44 are configured as independent means, the same effect can be exhibited.

[0030]

As described above, according to claim 1 of the present invention, the raw fuel preheater for heating the supplied raw fuel to a temperature suitable for the desulfurization reaction and the raw fuel heated by the raw fuel preheater. A desulfurizer that removes the sulfur content in the fuel, a steam separator that supplies steam, and a raw material preheater that raises the temperature of the mixed gas obtained by mixing the steam and raw fuel supplied from the steam separator with the reformed gas. A reformer for generating a reformed gas by heating the mixed gas heated by the raw material preheater, a CO shifter for transforming the reformed gas into a shift gas, and power generation using the shift gas as a fuel gas, A fuel cell that circulates the cooling water that has been heated by cooling water generated by power generation by cooling water and circulates it through a steam separator, a raw fuel for startup heating and reforming off-gas that does not contribute to power generation during power generation operation. Installed in the reformer furnace to burn In a phosphoric acid fuel cell power generator including a burner, a flame temperature sensor that measures the flame temperature of the burner, a flame temperature collection unit that sequentially collects the flame temperatures measured by the flame temperature sensor, and a flame temperature collection unit It is equipped with a flame temperature comparison unit that compares the flame temperature collected in sequence with the reference value of the preset temperature to determine the combustion / misfire of the burner, and the flame temperature compared by the flame temperature comparison unit is the reference. Since the supply of raw fuel is stopped when the value is less than the specified value, it becomes possible to accurately monitor the state of the combustion flame during the power generation operation of the burner installed in the furnace of the reformer. Can be improved.

According to a second aspect of the present invention, the raw fuel preheater for heating the supplied raw fuel to a temperature suitable for the desulfurization reaction, and the sulfur content in the raw fuel heated by the raw fuel preheater. A desulfurizer for removing steam, a steam separator for supplying steam, a raw material preheater for raising the temperature of a mixed gas obtained by mixing steam and raw fuel supplied from the steam separator with a reformed gas, and a raw material preheater A reformer that heats the mixed gas whose temperature has been raised to generate reformed gas, a CO shifter that transforms the reformed gas into a shift gas, and power is generated using the shift gas as a fuel gas.
A fuel cell that circulates the cooling water that has been heated by cooling water generated by power generation by cooling water and circulates it through a steam separator, a raw fuel for startup heating and reforming off-gas that does not contribute to power generation during power generation operation. In a phosphoric acid fuel cell power generator equipped with a burner provided in the furnace of the reformer for burning, a flame temperature sensor for measuring the flame temperature of the burner, and a flame temperature measured by the flame temperature sensor. A flame temperature collection unit that sequentially collects, a flame temperature change amount calculation unit that calculates the time change amount of the flame temperature from the flame temperature that is sequentially collected by the flame temperature collection unit, and a flame temperature calculated by the flame temperature change amount calculation unit. The flame temperature change amount comparison unit that compares the time change amount with the reference value of the time change amount set in advance to determine the burner combustion / misfire, and the time compared by the flame temperature change amount comparison unit. Strange When the amount is less than the standard value, the supply of raw fuel is stopped, so it is possible to accurately monitor the state of the combustion flame at the time of startup temperature rise of the burner installed in the furnace of the reformer. Therefore, the reliability can be improved.

According to the third aspect of the present invention, the raw fuel preheater for heating the supplied raw fuel to a temperature suitable for the desulfurization reaction, and the sulfur content in the raw fuel heated by the raw fuel preheater. A desulfurizer for removing steam, a steam separator for supplying steam, a raw material preheater for raising the temperature of a mixed gas obtained by mixing steam and raw fuel supplied from the steam separator with a reformed gas, and a raw material preheater A reformer that heats the mixed gas whose temperature has been raised to generate reformed gas, a CO shifter that transforms the reformed gas into a shift gas, and power is generated using the shift gas as a fuel gas.
A fuel cell that circulates the cooling water that has been heated by cooling water generated by power generation by cooling water and circulates it through a steam separator, a raw fuel for startup heating and reforming off-gas that does not contribute to power generation during power generation operation. In a phosphoric acid fuel cell power generator equipped with a burner provided in a furnace of a reformer for burning, a pressure sensor for measuring the pressure in the furnace provided with a burner and a pressure sensor The in-furnace pressure collection unit that sequentially collects the in-furnace pressure, the in-furnace pressure change amount calculation unit that calculates the temporal change amount of the in-furnace pressure from the in-furnace pressure that is sequentially collected in the in-furnace pressure collection unit, and In-reactor pressure change amount comparison unit that compares the in-reactor pressure time change amount calculated by the pressure change amount calculation unit with a preset reference value of the in-reactor pressure change amount that is used to determine burner combustion / misfire And equipped with the When the amount of pressure change is less than the reference value, the supply of raw fuel is stopped, so it is necessary to accurately monitor the state of the combustion flame when the temperature of the burner installed in the reformer furnace is increased. Therefore, the reliability can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a phosphoric acid fuel cell power generator according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing a configuration of a phosphoric acid fuel cell power generator according to Embodiment 2 of the present invention.

FIG. 3 is a block diagram showing a configuration of a phosphoric acid fuel cell power generator according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional phosphoric acid fuel cell power generator.

[Explanation of symbols]

22 raw fuel preheater, 26 raw material preheater, 27 reformer, 28 burner, 30 fuel cell, 33 circuit breaker, 3
4 flame temperature sensor, 35 flame temperature collecting unit, 36 flame temperature comparing unit, 37, 40 flame temperature monitoring means, 38
Flame temperature change amount calculation unit, 39 Flame temperature change amount comparison unit,
41 pressure sensor, 42 in-furnace pressure collection unit, 43 in-furnace pressure change amount calculation unit, 44 in-furnace pressure change amount comparison unit.

Claims (3)

[Claims] 1. A raw fuel preheater for heating a supplied raw fuel to a temperature suitable for a desulfurization reaction, a desulfurizer for removing a sulfur content in the raw fuel heated by the raw fuel preheater, and steam. A steam separator for supplying, a raw material preheater for raising the temperature of a mixed gas obtained by mixing the steam and the raw fuel supplied from the steam separator by the reformed gas, and the temperature of the raw material preheater A reformer that heats the mixed gas to generate the reformed gas, a CO shifter that shifts the reformed gas to a shift gas, and power is generated by using the shift gas as a fuel gas. In order to combust the fuel cell that circulates the cooling water whose temperature has been raised by cooling with the steam separator, and the reforming off gas that does not contribute to power generation during the power generation operation and the raw fuel for starting temperature rise. Installed in the furnace of the above reformer In a phosphoric acid fuel cell power generator having a burner with a burned burner, a flame temperature sensor for measuring the flame temperature of the burner, and a flame temperature collecting unit for sequentially collecting the flame temperature measured by the flame temperature sensor, , A flame temperature comparing unit for comparing the flame temperature sequentially collected in the flame temperature collecting unit and a reference value of a temperature preset in order to determine the combustion / misfire of the burner, and the flame temperature comparing unit The phosphoric acid fuel cell power generation device, wherein the supply of the raw fuel is stopped when the flame temperature compared with the reference temperature is equal to or lower than the reference value. 2. A raw fuel preheater for heating a supplied raw fuel to a temperature suitable for a desulfurization reaction, a desulfurizer for removing sulfur in the raw fuel heated by the raw fuel preheater, and steam. A steam separator for supplying, a raw material preheater for raising the temperature of a mixed gas obtained by mixing the steam and the raw fuel supplied from the steam separator by the reformed gas, and the temperature of the raw material preheater A reformer that heats the mixed gas to generate the reformed gas, a CO shifter that shifts the reformed gas to a shift gas, and power is generated by using the shift gas as a fuel gas. In order to combust the fuel cell that circulates the cooling water whose temperature has been raised by cooling with the steam separator, and the reforming off gas that does not contribute to power generation during the power generation operation and the raw fuel for starting temperature rise. Installed in the furnace of the above reformer In a phosphoric acid fuel cell power generator having a burner with a burned burner, a flame temperature sensor for measuring the flame temperature of the burner, and a flame temperature collecting unit for sequentially collecting the flame temperature measured by the flame temperature sensor, , A flame temperature change amount calculation unit that calculates a time change amount of the flame temperature from the flame temperature sequentially collected in the flame temperature collection unit, and a time change amount of the flame temperature calculated by the flame temperature change amount calculation unit And a flame temperature change amount comparison unit that compares a reference value of a time change amount set in advance in order to determine combustion / misfire of the burner,
A phosphoric acid fuel cell power generator, wherein the supply of the raw fuel is stopped when the time variation compared by the flame temperature variation comparing unit is equal to or less than the reference value. 3. A raw fuel preheater for heating the supplied raw fuel to a temperature suitable for a desulfurization reaction, a desulfurizer for removing the sulfur content in the raw fuel heated by the raw fuel preheater, and steam. A steam separator for supplying, a raw material preheater for raising the temperature of a mixed gas obtained by mixing the steam and the raw fuel supplied from the steam separator by the reformed gas, and the temperature of the raw material preheater A reformer that heats the mixed gas to generate the reformed gas, a CO shifter that shifts the reformed gas to a shift gas, and power is generated by using the shift gas as a fuel gas. In order to combust the fuel cell that circulates the cooling water whose temperature has been raised by cooling with the steam separator, and the reforming off gas that does not contribute to power generation during the power generation operation and the raw fuel for starting temperature rise. Installed in the furnace of the above reformer In a phosphoric acid fuel cell power generator equipped with a burner equipped with a burner, a pressure sensor for measuring the pressure in the furnace provided with the burner, and the pressure in the furnace measured by the pressure sensor are sequentially collected. In-furnace pressure collection unit, in-furnace pressure change amount calculation unit that calculates the temporal change amount of the in-furnace pressure from the in-furnace pressure sequentially collected in the in-furnace pressure collection unit, and in-furnace pressure change amount calculation unit The in-reactor pressure change amount comparison unit for comparing the in-reactor pressure change amount calculated in step 1 with the reference value of the in-reactor pressure change amount set in advance to determine the combustion / misfire of the burner. A phosphoric acid fuel cell power generator, wherein the supply of the raw fuel is stopped when the pressure change amount compared by the in-reactor pressure change amount comparison unit is equal to or less than the reference value.