JP2002313375A - Fuel cell power generating facility and turbine power generating facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate the electric energy with a high power generating efficiency even when a certain rate of air flow necessary for power generation is supplied in a facility in which a plurality of fuel cell parts are arranged in series. SOLUTION: Fuel cell parts 11a, 11b, 11c are arranged in series in such a way that the air electrode exhausting parts 12a and 12b are independent of fuel electrode exhausting parts 13a and 13b, and mixers 15a and 15b are provided to introduce the air into the air electrode exhausting parts 12a and 12b, and a fresh air is fed from the mixers 15a and 15b to the fuel cell parts 11b and 11c situated downstream for refilling the oxygen and also making the cooling, and even in the case a certain rate of air flow necessary for power generation is supplied in the facility in which a plurality of fuel cell parts 11a, 11b, 11c are arranged in series, the temperature of the working fluid and the oxygen concentration in the fuel cell parts 11a, 11b, 11c can be made optimum, and it is possible to generate the electric energy with a high power generating efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell power generation facility and a turbine power generation facility for generating power by combining a fuel cell power generation facility with a turbine.

[0002]

2. Description of the Related Art A fuel cell (FC) power generation system is a device for generating power by causing an electrochemical reaction between air and fuel gas through an electrolyte, and can generate electric energy with high power generation efficiency. Further, the FC power generation equipment can also generate heat energy that can be recovered and used from an FC power generation unit that generates power by performing an electrochemical reaction between air and a fuel gas, or from exhaust gas. Accordingly, various studies have been made to recover heat energy by a gas turbine topping cycle or a steam turbine bottoming cycle and use it for power generation.
A combined power generation facility (turbine power generation facility) combining a power generation facility, a gas turbine, and a steam turbine is expected as a facility with high energy saving efficiency.

[0003]

In such a turbine power generation facility, it is considered that FC power generation units are arranged in series, and exhaust gas discharged from the first-stage FC power generation unit is supplied to the second-stage FC power generation unit to generate power. Have been. However, the second stage FC
The temperature of the exhaust gas supplied to the power generation unit rises due to the reaction in the first-stage FC power generation unit, gradually increases to a high temperature, and oxygen decreases. Therefore, means such as using an FC power generation unit having a wide optimum operating temperature range or supplying a large amount of air including air for cooling other than operation, that is, supplying a flow rate higher than the flow rate necessary for power generation, etc. Need to take. For this reason, FC
Power generation equipment, gas turbines, and turbine equipment combined with steam turbines, in order to take advantage of the characteristics of generating electric energy with high power generation efficiency, increase the power performance for supplying air and fuel, and reduce power generation loss due to temperature changes. There are problems such as the need to develop a small number of FC power generation units, and at present, they have not been put into practical use.

[0004] The present invention has been made in view of the above situation, and even when air is supplied at a flow rate required for power generation in a facility in which fuel cell power generation units are arranged in series, each fuel cell power generation unit is provided with a fuel cell power generation unit. It is an object of the present invention to provide a fuel cell power generation facility capable of optimizing the temperature and oxygen concentration of a working fluid.

Further, the present invention has been made in view of the above situation, and even when air is supplied at a flow rate required for power generation in a facility in which fuel cell power generation units are arranged in series, each fuel cell power generation unit is provided. It is an object of the present invention to provide a turbine equipment provided with a fuel cell power generation equipment capable of optimizing the temperature and oxygen concentration of a working fluid in a fuel cell.

[0006]

According to a first aspect of the present invention, there is provided a fuel cell power generation system comprising: a fuel cell having a fuel cell unit for generating power by performing an electrochemical reaction between air and a fuel gas via an electrolyte; In the battery power generation equipment, the air electrode exhaust unit and the fuel electrode exhaust unit are independently arranged, a plurality of fuel cell units are arranged in series, and an introduction unit for introducing air to the air electrode exhaust unit between the fuel cell units is provided. It is characterized by the following.

In order to achieve the above object, a fuel cell power generation system according to the present invention is provided in a fuel cell power generation system having a fuel cell unit for generating power by performing an electrochemical reaction between air and fuel gas via an electrolyte. A plurality of fuel cell units are arranged in series with the cathode exhaust unit and the anode exhaust unit being independent,
Introducing means for introducing air to the air electrode exhaust section between the fuel cell sections, and extracting means for extracting exhaust corresponding to the air introduced from the introducing means to the air electrode exhaust section between the fuel cell sections. It is characterized by the following.

The fuel gas preheating means for exchanging heat with the fuel gas introduced into the fuel cell section on the most upstream side is provided in the fuel electrode exhaust section between the fuel cell sections. Further, an air preheating means for performing heat exchange with air introduced into the introduction means is provided in the fuel electrode exhaust part between the fuel cell units. Further, a second air preheating means for exchanging heat between the exhaust gas extracted from the extraction means and the air introduced into the fuel cell on the most upstream side is provided.

In order to achieve the above object, the structure of the fuel cell power generation equipment according to the present invention is directed to a fuel cell power generation equipment having a fuel cell part for generating power by performing an electrochemical reaction between air and fuel gas through an electrolyte. A plurality of fuel cell units are arranged in series with the cathode exhaust unit and the anode exhaust unit being independent,
An introduction unit for introducing air to the cathode exhaust unit between the fuel cell units, and an extraction unit for extracting exhaust corresponding to the air introduced from the introduction unit to the cathode exhaust unit between the fuel cell units, Air preheating means for exchanging heat with the air introduced into the introduction means is provided in the fuel electrode exhaust section between the fuel cell sections, and the exhaust gas extracted from the extraction means and introduced into the most upstream fuel cell section. Second air preheating means for exchanging heat with the air flowing therethrough, and heat exchange between the extracted exhaust gas heat-exchanged by the second air preheating means and the fuel gas introduced into the fuel cell unit on the most upstream side. And a second fuel gas preheating means for performing the following steps: between the downstream of the second fuel gas preheating means and the exhaust of the most downstream fuel cell section in the passage of the fuel gas introduced into the most upstream fuel cell section. Equipped with third fuel gas preheating means for heat exchange And it features.

[0010] To achieve the above object, the construction of the turbine power generation equipment according to the present invention comprises a fuel cell unit for generating electricity by performing an electrochemical reaction between air and a fuel gas through an electrolyte, and a fuel cell unit for compressing intake air to generate a fuel cell. In a turbine power generation facility comprising a gas turbine and a turbine power generation unit comprising a gas turbine which operates a compressor to be introduced into the unit and a generator for outputting electric power by exhaust of the fuel cell unit, the air electrode exhaust unit and the fuel electrode exhaust unit are made independent. A plurality of fuel cell sections arranged in series, and an introduction means for introducing air to an air electrode exhaust section between the fuel cell sections is provided.

In order to achieve the above object, the construction of the turbine power generation equipment according to the present invention comprises a fuel cell unit for generating electricity by electrochemically reacting air and fuel gas through an electrolyte, and a compressor for compressing intake air. In a turbine power generation facility comprising a compressor introduced into the fuel cell unit and a turbine power generation unit comprising a gas turbine which operates a generator for outputting electric power by exhausting the fuel cell unit, an air electrode exhaust unit and a fuel electrode exhaust unit are connected to each other. A plurality of fuel cell units are independently arranged in series, and an introduction unit is provided for introducing air to the cathode exhaust unit between the fuel cell units, and is introduced from the introduction unit to the cathode exhaust unit between the fuel cell units. Extraction means for extracting exhaust gas corresponding to the air.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a turbine power generation system according to the present invention. 1 to 5 show a schematic system of a turbine power generation facility having a fuel cell power generation facility according to an embodiment of the present invention.

The turbine power generation equipment in each embodiment shown in the drawings generates steam between a combustion turbine (gas turbine) 4 having a compressor 1, a combustor 2 and a turbine 3, and an exhaust of the combustion turbine. It comprises a steam generating means (exhaust heat recovery boiler) 5 and a steam turbine system 6 into which steam generated by the exhaust heat recovery boiler 5 is introduced as a working fluid. Then, compressed air from the compressor 1 of the gas turbine 4 is supplied as working air for a fuel cell (FC) power generation facility, and exhaust gas from the FC power generation facility is introduced into the combustor 2 to recover heat.

In each of the embodiments described below, the FC
The power generation equipment and the gas turbine 4 are combined, and the working air of the FC power generation equipment is supplied from the compressor 1 of the gas turbine 4,
Although a description is given of an example of a turbine power generation facility in which exhaust gas from the FC power generation facility is collected by the combustor 2,
The supply source of the working air supplied to the FC power generation equipment and the introduction destination of the exhaust gas discharged from the FC power generation equipment are not limited to the illustrated example, but may be any other systems.

Referring to FIG. 1, a turbine power plant 10 including an FC power plant 7 according to a first embodiment of the present invention will be described.

A gas turbine 4 of a turbine power plant 10 shown in FIG. 1 includes a compressor 1, a combustor 2, and a turbine 3. The air compressed by the compressor 1 is supplied as working air for the FC power generation facility 7, and the exhaust gas from the FC power generation facility 7 is introduced into the combustor 2. Fuel fc is introduced into the combustor 2 together with the exhaust gas, and the combustion gas in the combustor 2 is expanded in the turbine 3. A generator 8 is connected to the turbine 3, and power is generated by the operation of the turbine 3. The exhaust gas of the turbine 3 is sent to an exhaust heat recovery boiler 5, where the heat is recovered and released from the stack STCK to the atmosphere. The steam generated in the exhaust heat recovery boiler 5 is sent to a steam turbine system 6 to perform work.

The FC power generation equipment 7 is configured by arranging fuel cell units 11a, 11b and 11c for generating power by electrochemically reacting air and fuel gas f through an electrolyte. Then, the fuel cell unit 11a and the fuel cell unit 11b
Between the air electrode and the fuel electrode of the air electrode exhaust portion 12a
The fuel cell unit 11b and the fuel cell unit 11c communicate with each other, and the air electrode and the fuel electrode of the fuel cell unit 11b and the fuel cell unit 11c communicate with each other through the air electrode exhaust unit 12b and the fuel electrode exhaust unit 13b. Further, the air electrode and the fuel electrode of the fuel cell unit 11c are connected to the combustor 2 by exhaust gas passages 12c and 13c.

It should be noted that two fuel cell units 11 can be arranged in series, or four or more fuel cell units 11 can be arranged in series. Further, it is also possible that the exhaust gas in the exhaust gas passages 12c and 13c is burned in the combustion section, and the burned exhaust gas is connected to the combustor 2.

The fuel electrode f of the fuel cell section 11a has a fuel gas f
Is introduced as the operating fuel, and the compressed air compressed by the compressor 1 is heated to the air electrode by the heat exchanger 14 (the heat medium is appropriately applied to the exhaust gas of the fuel cell unit 11 or the like) to introduce air. Air is introduced from the passage 19 as working air. The fuel gas f and the compressed air that have been introduced into the fuel cell unit 11a and have finished operating are sent from the cathode exhaust unit 12a and the anode exhaust unit 13a to the fuel cell unit 11b, and after operating the fuel cell unit 11b, the cathode The gas is sent from the exhaust unit 12b and the fuel electrode exhaust unit 13b to the fuel cell unit 11c. The exhaust gas that has been operated in the fuel cell unit 11c is introduced into the combustor 2 from the exhaust gas passages 12c and 13c, burned in the combustor 2 together with the combustion fuel fc, introduced into the turbine 3, and expanded.

Cathode exhaust unit 12a and cathode exhaust unit 12
b, a mixer 15a and a mixer 15b as introduction means
Are provided in the anode exhaust section 13a and the anode exhaust section 13b, respectively.
And an air preheater 16b. A part of the air compressed by the compressor 1 is sent to the air preheater 16a and the air preheater 16b through a branch passage 20 branched from the air introduction passage 19, and the air preheater 16a and the air preheater 1
6b, the mixture is preheated to a predetermined temperature,
Preheated compressed air is introduced into 5b. An extraction path 17a and an extraction path 17b as extraction means are provided in a branched manner in the cathode exhaust section 12a and the cathode exhaust section 12b on the upstream side of the mixers 15a and 15b, respectively.
7a and the extraction path 17b are connected to the exhaust gas path 12c. From the extraction passages 17a and 17b, an amount of exhaust gas corresponding to the preheated compressed air introduced into the mixers 15a and 15b is extracted and sent to the exhaust gas passage 12c.

In the turbine power plant 10 having the above configuration, the compressed air from the compressor 1 of the gas turbine 4 is supplied to the heat exchanger 14.
And is supplied from the air introduction path 19 as working air for the FC power generation equipment 7. The fuel gas f is supplied as fuel for operating the FC power generation facility 7. The exhaust gas of the working air and the working fuel that has finished operating in the FC power generation facility 7 is introduced into the combustor 2 from the exhaust gas passages 12c and 13c, and the exhaust gas is burned in the combustor 2 together with the combustion fuel fc. Combustion gas from the combustor 2 is introduced into the turbine 3 and exhausted after being expanded. The exhaust gas of the turbine 3 is sent to an exhaust heat recovery boiler 5, and the steam generated in the exhaust heat recovery boiler 5 is sent to a steam turbine system 6 to perform work. The generator 8 is operated by the operation of the turbine 3 to generate power, and the FC power generation facility 7 generates power.

The compressed air and the fuel gas f from the air introduction path 19 are introduced into the fuel cell unit 11a of the FC power generation facility 7 to operate the fuel cell unit 11a. The compressed air and fuel gas f that have operated the fuel cell unit 11a are
a and the fuel electrode exhaust portion 13a to the fuel cell portion 11b. On the other hand, a part of the air compressed by the compressor 1 passes through the branch passage 20 and is preheated by the air preheater 16a (the fuel gas f of the fuel electrode exhaust portion 13a is cooled), and the preheated compressed air is converted to the air electrode. It is introduced into the mixer 15a of the exhaust part 12a. At the same time, an amount of exhaust gas corresponding to the amount of preheated compressed air introduced into the mixer 15a is extracted from the extraction passage 17a, and the extracted exhaust gas is sent to the exhaust gas passage 12c.

The preheated compressed air is sent from the mixer 15a to the cathode exhaust unit 12a, so that the burned air (air with reduced oxygen: nitrogen) that operates the fuel cell unit 11a.
Is mixed with new air to supply oxygen, and the fuel cell unit 11a is operated to mix new air with the hot air to lower the temperature. In addition, the mixer 15
The exhaust gas is extracted from the extraction path 17a in accordance with the amount introduced into the exhaust gas 17a, so that the total amount of air is balanced.

For example, in the case of the fuel cell unit 11a in which the operating temperature of the compressed air and the fuel gas f is optimally 950 ° C.,
℃ compressed air and fuel gas f
After operation, the air and the fuel gas f are heated to, for example, 1050 ° C. Fuel electrode exhaust 13
In a, the temperature of the fuel gas f is reduced to, for example, 950 ° C. by heat exchange of the fuel gas f in the air preheater 16a. In the cathode exhaust unit 12a, the preheated compressed air is introduced into the mixer 15a, so that the temperature of the air is reduced to, for example, 950 ° C. and oxygen is supplied. Therefore, the fuel gas f controlled to the desired temperature and the air controlled to the desired temperature and supplemented with oxygen are supplied to the fuel cell unit 11b.
Sent to

The air and the fuel gas f that have operated the fuel cell unit 11b are introduced into the fuel cell unit 11c from the cathode exhaust unit 12b and the anode exhaust unit 13b. Further, a part of the air compressed by the compressor 1 passes through the branch passage 20 and is preheated by the air preheater 16b (the fuel gas f of the fuel electrode exhaust part 13b is cooled), and the preheated compressed air is converted to the air electrode. It is introduced into the mixer 15b of the exhaust part 12b. At the same time, an amount of exhaust gas corresponding to the amount of preheated compressed air introduced into the mixer 15b is extracted from the extraction passage 17b, and the extracted exhaust gas is sent to the exhaust gas passage 12c.

In the same manner as described above, the preheated compressed air is sent from the mixer 15b to the cathode exhaust unit 12b, so that the burned air (air: nitrogen with reduced oxygen: nitrogen) that operates the fuel cell unit 11b is newly added. The fresh air is mixed and replenished with oxygen, and the fresh air is mixed with the hot air by operating the fuel cell unit 11b to lower the temperature. In addition, the exhaust gas is extracted from the extraction passage 17b in accordance with the amount introduced into the mixer 15b, and the air after combustion is extracted, so that the entire air amount is balanced.

Then, in the case of the fuel cell unit 11b in which the operating temperature of the operating air and the fuel gas f is optimally 950 ° C.,
The air and the fuel gas f whose temperature has been reduced to 950 ° C. are introduced into the fuel cell unit 11b, and after the operation, the temperature of the air and the fuel gas f rises to, for example, 1050 ° C. In the fuel electrode exhaust portion 13b, the temperature of the fuel gas f is reduced to, for example, 950 by the heat exchange of the fuel gas f again in the air preheater 16b.
° C. In the cathode exhaust unit 12b, preheated compressed air is introduced into the mixer 15b, so that the temperature of the air is reduced to, for example, 950 ° C. and oxygen is supplied. Therefore, the fuel gas f controlled to the desired temperature and the air controlled to the desired temperature and supplemented with oxygen are sent to the fuel cell unit 11c.

The air and fuel gas f that have operated the fuel cell unit 11c are discharged as exhaust gas into exhaust gas passages 12c and 13c.
c to the combustor 2.

Therefore, the fuel cell units 11 arranged in series
Air, fuel gas f for operation under substantially the same conditions (temperature, amount, and oxygen concentration) are sent to a, 11b, 11c, and operation and cooling of the downstream fuel cell units 11b, 11c are performed. There is no need to introduce excess air into the upstream fuel cell unit 11a in anticipation of service air. In addition, the difference in operating temperature between the fuel cell units 11a, 11b, and 11c can be reduced, and power generation loss can be suppressed by using a fuel cell unit that has a narrow optimal operating temperature range.

In the above-mentioned turbine power generation facility 10, the fuel cell sections 11a, 11b, 11c are arranged in series, the path of the fuel gas f and the path of air are arranged in series, and the mixer 15 and the air preheater 16 By performing the cooling of each path, it is possible to reduce the temperature rise generated in the fuel cell units 11a, 11b, 11c. In addition, since it is not necessary to introduce excessive air into the upstream fuel cell unit 11a in anticipation of air for operating and cooling the downstream fuel cell units 11b and 11c, the fuel gas f and air for operation are removed. It is possible to reduce the power of auxiliary equipment or reduce the exhaust gas loss as a power generation system. Further, the cathode 15 is exhausted from the mixer 15
Is mixed with the preheated compressed air to supply fresh air to the fuel cell unit 11 on the downstream side, so that a decrease in performance due to oxygen consumption can be suppressed.

For this reason, even when air is supplied at a flow rate required for power generation in a facility in which a plurality of fuel cell units 11 are arranged in series, the temperature and oxygen concentration of the working fluid in each fuel cell unit 11 are maintained. It can be optimized, and the feature of generating electric energy with high power generation efficiency by combining the FC power generation equipment 7, the gas turbine 4, and the steam turbine system 6 can be maximized.

Referring to FIG. 2, a description will be given of a turbine power plant 22 having an FC power plant 21 according to a second embodiment of the present invention. Note that the same components as those of the FC power generation facility 7 and the turbine power generation facility 10 shown in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

The FC of the turbine power plant 22 shown in FIG.
The power generation equipment 21 includes fuel electrode discharge units 13a, 13b instead of the air preheaters 16a, 16b of the FC power generation equipment 7 shown in FIG.
b, fuel preheaters 23a and 23 as fuel gas preheating means;
b is provided. Then, the fuel gas f is preheated by exchanging heat with the exhaust fuel gas by the fuel preheaters 23b and 23a, and is supplied to the fuel cell unit 11a on the most upstream side. Further, the compressed air from the compressor 1 is directly mixed into the mixers 15a and 15b through the branch passage 20, and fresh air is supplied to the exhaust gas.

Therefore, similarly to the first embodiment, in the turbine power generation equipment 22 provided with the FC power generation equipment 21, the fuel cell units 11a, 11b, 11c arranged in series are operated under substantially the same conditions. Air and the fuel gas f are sent, so that it is not necessary to introduce excess air into the upstream fuel cell unit 11a, and it is possible to reduce exhaust gas loss and suppress performance degradation due to oxygen consumption. By combining the power generation facility 21, the gas turbine 4, and the steam turbine system 6, it is possible to maximize the feature of generating electric energy with high power generation efficiency.

Referring to FIG. 3, a turbine power plant 26 having an FC power plant 25 according to a third embodiment of the present invention will be described. Note that the same components as those of the FC power generation facility 21 and the turbine power generation facility 22 shown in FIG. 2 are denoted by the same reference numerals, and redundant description is omitted.

The FC of the turbine power plant 26 shown in FIG.
In addition to the configuration of the FC power generation facility 21 shown in FIG. 2, the power generation facility 25 is provided between the exhaust gas extracted from the extraction passages 17a and 17b and the compressed air introduced into the fuel cell unit 11a on the most upstream side. Second air preheaters 27 a and 27 b as second air preheating means for performing heat exchange are provided in the air introduction path 19. The compressed air introduced into the fuel cell unit 11a on the most upstream side is supplied to the second air preheaters 27b and 27a.
Thus, heat is exchanged with the exhaust gas extracted from the extraction passages 17a and 17b to preheat, and compressed air controlled to a predetermined temperature is introduced into the fuel cell unit 11a.

Therefore, similarly to the first and second embodiments,
In the turbine power generation equipment 26 having the FC power generation equipment 25,
The operating air and the fuel gas f under substantially the same conditions are sent to the fuel cell units 11a, 11b, 11c arranged in series, so that it is not necessary to introduce excess air into the upstream fuel cell unit 11a. As well as reducing exhaust gas loss,
Performance degradation due to oxygen consumption can be suppressed, and the feature of generating electric energy with high power generation efficiency by combining the FC power generation facility 25, the gas turbine 4, and the steam turbine system 6 can be maximized.

A turbine power plant 30 having an FC power plant 29 according to a fourth embodiment of the present invention will be described with reference to FIG. The FC power generation facilities 7, 2 shown in FIGS.
5 and the same components as those of the turbine power generation facilities 10 and 26 are denoted by the same reference numerals, and redundant description is omitted.

The FC of the turbine power plant 30 shown in FIG.
The power generation facility 29 includes, in addition to the configuration of the FC power generation facility 7 shown in FIG. 1, the exhaust gas extracted from the extraction passages 17a and 17b and the fuel on the most upstream side, similarly to the FC power generation facility 25 shown in FIG. Second air preheater 27 as second air preheating means for performing heat exchange with compressed air introduced into battery unit 11a
a, 27 b are provided in the air introduction path 19. The compressed air introduced into the fuel cell unit 11a on the most upstream side is preheated by heat exchange between the exhaust gas extracted from the extraction passages 17a and 17b by the second air preheaters 27b and 27a, and is preheated. Compressed air controlled to the temperature is introduced into the fuel cell unit 11a.

Therefore, similarly to the first to third embodiments, in the turbine power plant 30 provided with the FC power plant 29, the fuel cell units 11a, 11b, 11
In operation c, the operating air and fuel gas f under substantially the same conditions are sent, so that it is not necessary to introduce excess air into the upstream fuel cell unit 11a, so that exhaust gas loss can be reduced and oxygen consumption can be reduced. Performance can be suppressed, and F
C power generation equipment 29, gas turbine 4, and steam turbine system 6
It is possible to make the most of the feature of generating electric energy with high power generation efficiency.

Referring to FIG. 5, a turbine power generation facility 33 having an FC power generation facility 32 according to a fifth embodiment of the present invention will be described. Note that the same components as those of the FC power generation facility 29 and the turbine power generation facility 30 shown in FIG. 4 are denoted by the same reference numerals, and redundant description is omitted.

The FC of the turbine power generation equipment 33 shown in FIG.
In addition to the configuration of the FC power generation facility 29 shown in FIG. 4, the power generation facility 32 includes a second fuel gas preheating means as a second fuel gas preheating means in the extraction path 17 of the extracted exhaust gas heat-exchanged by the second air preheaters 27a and 27b. A two-fuel preheater 34 is provided. In the second fuel preheater 34, heat exchange (fuel preheating) is performed between the extracted exhaust gas heat-exchanged in the second air preheaters 27a and 27b and the fuel gas f introduced into the fuel cell unit 11a on the most upstream side. Done. The downstream side of the second fuel preheater 34 in the passage F of the fuel gas f introduced into the fuel cell section 11a on the
A third fuel preheater 35 is provided as fuel gas preheating means, and the third fuel preheater 35 includes a fuel cell unit 11 on the most downstream side.
The fuel gas f preheated by the second fuel preheater 34 is further preheated with the exhaust gas of c, and the fuel gas f controlled to a predetermined temperature is introduced into the fuel cell unit 11a.

Therefore, similarly to the first to fourth embodiments, in the turbine power generation facility 34 including the FC power generation facility 32, the fuel cell units 11a, 11b, 11
In operation c, the operating air and fuel gas f under substantially the same conditions are sent, so that it is not necessary to introduce excess air into the upstream fuel cell unit 11a, so that exhaust gas loss can be reduced and oxygen consumption can be reduced. Performance can be suppressed, and F
C power generation facility 32, gas turbine 4, and steam turbine system 6
It is possible to make the most of the feature of generating electric energy with high power generation efficiency.

[0044]

According to the fuel cell power generation equipment of the present invention, there is provided a fuel cell power generation equipment having a fuel cell part for generating electricity by performing an electrochemical reaction between air and fuel gas through an electrolyte. And a plurality of fuel cell sections arranged in series independently of each other, and an introduction means for introducing air to the cathode exhaust section between the fuel cell sections is provided. With the introduction, new air is mixed into the downstream fuel cell unit to replenish oxygen and perform cooling. For this reason, it is not necessary to introduce excess air into the fuel cell section on the upstream side, and it is possible to reduce auxiliary power or reduce exhaust gas loss as a power generation system, and to suppress performance degradation due to oxygen consumption. . Therefore, even when air is supplied at a flow rate necessary for power generation in a facility in which a plurality of fuel cell units are arranged in series, the temperature and oxygen concentration of the working fluid in each fuel cell unit can be optimized. In addition, it is possible to make the most of the feature of generating electric energy with high power generation efficiency.

Further, according to the fuel cell power generation equipment of the present invention, there is provided a fuel cell power generation equipment having a fuel cell part for generating electricity by electrochemically reacting air and fuel gas via an electrolyte, and A plurality of fuel cell units arranged in series independently of each other, and introducing means for introducing air to the cathode exhaust unit between the fuel cell units; and introducing means to the cathode exhaust unit between the fuel cell units. Since extraction means for extracting exhaust corresponding to the air introduced from is provided, by introducing air between the fuel cell units by the introduction means and extracting exhaust corresponding to the air introduced by the extraction means, New air is mixed into the downstream fuel cell unit while the total amount of air is balanced, and oxygen is supplied and cooling is performed. For this reason, it is not necessary to introduce excess air into the fuel cell section on the upstream side, so that it is possible to reduce auxiliary power or reduce exhaust gas loss as a power generation system, and suppress performance degradation due to oxygen consumption. . Therefore, even when air is supplied at a flow rate necessary for power generation in a facility in which a plurality of fuel cell units are arranged in series, the temperature and oxygen concentration of the working fluid in each fuel cell unit can be optimized. In addition, it is possible to make the most of the feature of generating electric energy with high power generation efficiency.

Further, according to the fuel cell power generation equipment of the present invention, there is provided a fuel cell power generation equipment having a fuel cell part for generating power by electrochemically reacting air and fuel gas through an electrolyte through an electrolyte. A plurality of fuel cell units arranged in series independently of each other, and introducing means for introducing air to the cathode exhaust unit between the fuel cell units; and introducing means to the cathode exhaust unit between the fuel cell units. Extraction means for extracting exhaust corresponding to the air introduced from the air supply means, and an air preheating means for exchanging heat with air introduced to the introduction means is provided in the fuel electrode exhaust section between the fuel cell sections, A second air preheating means for performing heat exchange between the exhaust gas extracted from the means and air introduced into the fuel cell unit on the most upstream side;
A second heat exchange between the extracted exhaust gas heat-exchanged by the air preheating means and the fuel gas introduced into the fuel cell unit on the most upstream side;
A fuel gas preheating means is provided, and heat exchange is performed between the exhaust of the fuel cell section on the downstream side and the downstream side of the second fuel gas preheating means in the passage of the fuel gas introduced into the fuel cell section on the most upstream side. Since the third fuel gas preheating means is provided, air is introduced between the fuel cell units by the introduction means, and exhaust gas corresponding to the air introduced by the extraction means is extracted, and the air preheating means and the second air preheating means are provided. , A second fuel gas preheating means and a third fuel gas preheating means.
By preheating the operating air and fuel by the fuel gas preheating means, new air is mixed into the downstream fuel cell unit while the total air amount is balanced, oxygen is supplied, and cooling is performed. It is possible to control the operating air and fuel to a predetermined temperature. For this reason, it is not necessary to control the operating air and fuel to optimal temperatures and introduce excess air into the fuel cell section on the upstream side, and as a power generation system, it is possible to reduce auxiliary machine power or reduce exhaust gas loss. This makes it possible to suppress performance degradation due to oxygen consumption. Therefore, even when air is supplied at a flow rate necessary for power generation in a facility in which a plurality of fuel cell units are arranged in series, the temperature and oxygen concentration of the working fluid in each fuel cell unit can be optimized. In addition, it is possible to make the most of the feature of generating electric energy with high power generation efficiency.

Further, the turbine power generation equipment of the present invention comprises a fuel cell unit for generating electricity by causing an electrochemical reaction between air and fuel gas through an electrolyte, a compressor for compressing intake air and introducing the compressed air into the fuel cell unit. In a turbine power generation facility consisting of a gas turbine that operates a generator that outputs electric power by exhausting a fuel cell unit, a plurality of fuel cell units are formed by making an air electrode exhaust unit and a fuel electrode exhaust unit independent. The fuel cell unit is arranged in series, and has an introduction means for introducing air to the air electrode exhaust unit between the fuel cell units. By introducing air between the fuel cell units by the introduction unit, the fuel cell unit on the downstream side is provided. Is mixed with fresh air to supply oxygen and cool. For this reason, it is not necessary to introduce excess air into the fuel cell section on the upstream side, and it is possible to reduce auxiliary power or reduce exhaust gas loss as a power generation system, and to suppress performance degradation due to oxygen consumption. .
Therefore, even when air is supplied at a flow rate necessary for power generation in a facility in which a plurality of fuel cell units are arranged in series, the temperature and oxygen concentration of the working fluid in each fuel cell unit can be optimized. In addition, it is possible to provide a turbine power generation facility that maximizes the characteristics of generating electric energy with high power generation efficiency.

Further, the turbine power generation equipment of the present invention comprises a fuel cell unit for generating electricity by causing an electrochemical reaction between air and fuel gas via an electrolyte, a compressor for compressing intake air and introducing the compressed air into the fuel cell unit. In a turbine power generation facility consisting of a gas turbine that operates a generator that outputs electric power by exhausting a fuel cell unit, a plurality of fuel cell units are formed by making an air electrode exhaust unit and a fuel electrode exhaust unit independent. Introducing means for arranging in series and introducing air to the air electrode exhaust section between the fuel cell sections, and extracting exhaust corresponding to the air introduced from the introducing means to the air electrode exhaust section between the fuel cell sections. Since the extraction means is provided, air is introduced between the fuel cell units by the introduction means and exhaust gas corresponding to the air introduced by the extraction means is extracted, so that the total amount of air is balanced. Mixed new air to the fuel cell portion of the wake side while being oxygen can be performed cooled while being replenished. For this reason, it is not necessary to introduce excess air into the fuel cell section on the upstream side, and it is possible to reduce auxiliary power or reduce exhaust gas loss as a power generation system, and to suppress performance degradation due to oxygen consumption. . Therefore, even when air is supplied at a flow rate necessary for power generation in a facility in which a plurality of fuel cell units are arranged in series, the temperature and oxygen concentration of the working fluid in each fuel cell unit can be optimized. In addition, it is possible to provide a turbine power generation facility that maximizes the characteristics of generating electric energy with high power generation efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram of a turbine power generation facility including a fuel cell power generation facility according to a first embodiment of the present invention.

FIG. 2 is a schematic system diagram of a turbine power plant equipped with a fuel cell power plant according to a second embodiment of the present invention.

FIG. 3 is a schematic system diagram of a turbine power plant equipped with a fuel cell power plant according to a third embodiment of the present invention.

FIG. 4 is a schematic system diagram of a turbine power plant equipped with a fuel cell power plant according to a fourth embodiment of the present invention.

FIG. 5 is a schematic system diagram of a turbine power plant equipped with a fuel cell power plant according to a fifth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Compressor 2 Combustor 3 Turbine 4 Combustion turbine (Gas turbine) 5 Steam generation means (Exhaust heat recovery boiler) 6 Steam turbine system 7, 21, 25, 29, 32 Fuel cell (FC) power generation equipment 8 Generator 10, 22, 26, 30, 33 Turbine power generation equipment 11a, 11b, 11c Fuel cell unit 12a, 12b Air electrode exhaust unit 13a, 13b Fuel electrode exhaust unit 12c, 13c Exhaust gas passage 14 Heat exchanger 15a, 15b Mixer 16a, 16b Air preheater 17a, 17b Discharge path 19 Air introduction path 20 Branch path 23a, 23b Fuel preheater 27a, 27b Second air preheater 34 Second fuel preheater 35 Third fuel preheater

 ──────────────────────────────────────────────────続 き The continuation of the front page F term (reference) 5H027 BC11 DD02

Claims (8)

[Claims] In a fuel cell power generation facility having a fuel cell unit for generating power by performing an electrochemical reaction between air and a fuel gas via an electrolyte, a plurality of fuel cells are provided by independently providing an air electrode exhaust unit and a fuel electrode exhaust unit. A fuel cell power generation facility comprising: battery units arranged in series; and introduction means for introducing air into an air electrode exhaust unit between the fuel cell units. 2. A fuel cell power generation system having a fuel cell unit for generating electricity by electrochemically reacting air and fuel gas via an electrolyte, wherein a plurality of fuel cells are provided by independently providing an air electrode exhaust unit and a fuel electrode exhaust unit. The battery unit is arranged in series, and an introduction means for introducing air to the cathode exhaust unit between the fuel cell units is provided, and the exhaust corresponding to the air introduced from the introduction unit to the cathode exhaust unit between the fuel cell units is provided. Fuel cell power generation equipment, characterized by comprising extraction means for extracting water. 3. A fuel electrode exhaust section between fuel cells according to claim 1, wherein fuel gas preheating means for performing heat exchange with fuel gas introduced into the fuel cell section on the most upstream side is provided. A fuel cell power generation facility characterized in that: 4. The fuel exhaust system according to claim 1, further comprising an air preheating unit for exchanging heat with air introduced into the introduction unit, in the fuel electrode exhaust unit between the fuel cell units. Fuel cell power generation equipment. 5. The apparatus according to claim 2, further comprising second air preheating means for performing heat exchange between the exhaust gas extracted from the extraction means and air introduced into the fuel cell unit on the most upstream side. Fuel cell power generation equipment. 6. A fuel cell power generation system having a fuel cell unit for generating power by performing an electrochemical reaction between air and a fuel gas through an electrolyte, wherein a plurality of fuels are provided by independently providing an air electrode exhaust unit and a fuel electrode exhaust unit. The battery unit is arranged in series, and an introduction means for introducing air to the cathode exhaust unit between the fuel cell units is provided, and the exhaust corresponding to the air introduced from the introduction unit to the cathode exhaust unit between the fuel cell units is provided. Extraction means for extracting air, and an air preheating means for exchanging heat with air introduced into the introduction means is provided in the fuel electrode exhaust section between the fuel cell sections, and the exhaust gas extracted from the extraction means and the most upstream Second air preheating means for exchanging heat with the air introduced into the fuel cell section on the side, and the extracted exhaust heat exchanged by the second air preheating means and introduced into the fuel cell section on the most upstream side Second heat exchange with fuel gas A fuel gas preheating means, and a second fuel gas passage for introducing the fuel gas into the fuel cell section on the most upstream side.
A fuel cell power generation facility comprising: a third fuel gas preheating unit that performs heat exchange between the downstream side of the fuel gas preheating unit and exhaust gas from a fuel cell unit on the most downstream side. 7. A fuel cell unit for generating electricity by causing an electrochemical reaction between air and a fuel gas through an electrolyte, a compressor for compressing intake air and introducing the compressed air into the fuel cell unit, and a generator for outputting electric power. In a turbine power generation facility including a gas turbine that is operated by exhausting a battery unit, a plurality of fuel cell units are arranged in series with an air electrode exhaust unit and a fuel electrode exhaust unit being independent, and a fuel cell unit is provided. A turbine power generation facility comprising an introduction means for introducing air to an air electrode exhaust portion between the two. 8. A fuel cell unit for generating electricity by causing an electrochemical reaction between air and a fuel gas through an electrolyte, a compressor for compressing intake air and introducing it to the fuel cell unit, and a generator for outputting electric power. In a turbine power generation facility including a gas turbine that is operated by exhausting a battery unit, a plurality of fuel cell units are arranged in series with an air electrode exhaust unit and a fuel electrode exhaust unit being independent, and a fuel cell unit is provided. And an extracting means for extracting exhaust gas corresponding to the air introduced from the introducing means to the air electrode exhaust section between the fuel cell sections. And turbine power generation equipment.