JPH11144750A - Fuel cell generating device with carbon dioxide recovering device - Google Patents

Fuel cell generating device with carbon dioxide recovering device

Info

Publication number
JPH11144750A
JPH11144750A JP9302405A JP30240597A JPH11144750A JP H11144750 A JPH11144750 A JP H11144750A JP 9302405 A JP9302405 A JP 9302405A JP 30240597 A JP30240597 A JP 30240597A JP H11144750 A JPH11144750 A JP H11144750A
Authority
JP
Japan
Prior art keywords
carbon dioxide
gas
exhaust gas
cathode
anode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP9302405A
Other languages
Japanese (ja)
Other versions
JP3865167B2 (en
Inventor
Oki Takei
意 武井
Kokichi Uematsu
宏吉 上松
Kazunori Kobayashi
和典 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHI Corp
Original Assignee
IHI Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by IHI Corp filed Critical IHI Corp
Priority to JP30240597A priority Critical patent/JP3865167B2/en
Publication of JPH11144750A publication Critical patent/JPH11144750A/en
Application granted granted Critical
Publication of JP3865167B2 publication Critical patent/JP3865167B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02CCAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00Capture or disposal of greenhouse gases
    • Y02C20/40Capture or disposal of greenhouse gases of CO2
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30Hydrogen technology
    • Y02E60/50Fuel cells

Landscapes

  • Fuel Cell (AREA)
  • Treating Waste Gases (AREA)

Abstract

PROBLEM TO BE SOLVED: To significantly reduce the carbon dioxide released to the atmosphere without lowering the plant generating efficiency by recovering the remaining carbon dioxide except the carbon dioxide necessary for the cell reaction of an anode exhaust gas. SOLUTION: The anode exhaust gas and cathode exhaust gas of a fuel cell 20 are partially supplied to a first combustor 23, and a high-temperature combustion exhaust gas generated by combustion is supplied to a reformer 22. The combustion exhaust gas after heating a fuel gas in the reformer 22 contains carbon dioxide. This is supplied to the cathode by a carbon dioxide recycle line 7, because it is necessary for the cell reaction in the cathode. A carbon dioxide recovering device 40 heats the anode exhaust gas to about 3 MPa and cools it to about -40 deg.C to liquefy and take out the carbon dioxide. The anode exhaust gas from which the carbon dioxide is removed and the cathode exhaust gas are burnt in a second combustor 4 to form a combustion gas, which is then supplied to a waste heat recovering steam generating device 30, after driving the turbine of a turbine compressor 28.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、アノード排ガスに
含まれる炭酸ガスを回収する炭酸ガス回収装置付燃料電
池発電装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel cell power generator with a carbon dioxide recovery device for recovering carbon dioxide contained in exhaust gas from an anode.

【0002】[0002]

【従来の技術】溶融炭酸塩型燃料電池は、高効率で環境
への影響が少ないなど、従来の発電装置にない特徴を有
しており、水力、火力、原子力に続く発電システムとし
て注目を集め、現在鋭意研究が進められている。
2. Description of the Related Art Molten carbonate fuel cells have features not found in conventional power generators, such as high efficiency and low environmental impact, and have attracted attention as power generation systems following hydro, thermal and nuclear power. Currently, intensive research is underway.

【0003】図2は都市ガスを燃料とする溶融炭酸塩型
燃料電池を用いた発電設備の一例を示す図である。同図
において、発電設備は、蒸気と混合した燃料ガス(都市
ガス)を水素を含むアノードガスに改質する改質器22
と、酸素を含むカソードガスと水素を含むアノードガス
とから発電する燃料電池20とを備えており、改質器2
2で作られるアノードガスはアノードガスライン2によ
り燃料電池20に供給され、燃料電池20の中でその大
部分を消費してアノード排ガスとなり、アノード排ガス
ライン4により燃焼用ガスとして燃焼器23へ供給され
る。
FIG. 2 is a diagram showing an example of a power generation facility using a molten carbonate fuel cell using city gas as fuel. In the figure, a power generation facility is a reformer 22 for reforming a fuel gas (city gas) mixed with steam into an anode gas containing hydrogen.
And a fuel cell 20 that generates power from a cathode gas containing oxygen and an anode gas containing hydrogen.
The anode gas produced in Step 2 is supplied to the fuel cell 20 through the anode gas line 2, and most of the anode gas is consumed in the fuel cell 20 to become anode exhaust gas, and supplied to the combustor 23 as combustion gas through the anode exhaust line 4. Is done.

【0004】燃焼器23ではアノード排ガス中の可燃成
分(水素、一酸化炭素、メタン等)を燃焼して高温の燃
焼排ガスを生成し、改質器22の加熱室に供給しこの燃
焼排ガスにより改質室を加熱し、改質室で改質触媒によ
り燃料ガスを改質してアノードガスとする。アノードガ
スは燃料予熱器24によって燃料ガスライン1を流れる
蒸気と混合した燃料ガスと熱交換し、燃料電池20のア
ノードに供給される。また加熱室を出た燃焼排ガスは炭
酸ガスリサイクルライン7で炭酸ガスリサイクルブロワ
32によりカソードに供給される。燃焼排ガスには多量
の炭酸ガスが含まれており、電池反応に必要な炭酸ガス
の供給源となる。空気ライン8からの空気が炭酸ガスリ
サイクルブロワ32の出側に供給されカソードの電池反
応に必要な酸素を供給する。カソードから排出されるカ
ソード排ガスの一部は循環ライン3によりカソードに供
給される。このカソード排ガスと燃焼排ガスと空気が混
合してカソードガスとなりカソードに供給される。
[0004] The combustor 23 burns combustible components (hydrogen, carbon monoxide, methane, etc.) in the anode exhaust gas to generate high-temperature combustion exhaust gas, which is supplied to a heating chamber of the reformer 22 and reformed by the combustion exhaust gas. The fuel chamber is heated, and the fuel gas is reformed by the reforming catalyst in the reforming chamber to produce anode gas. The anode gas exchanges heat with the fuel gas mixed with the steam flowing through the fuel gas line 1 by the fuel preheater 24, and is supplied to the anode of the fuel cell 20. Further, the flue gas discharged from the heating chamber is supplied to the cathode by a carbon dioxide gas recycling blower 32 in a carbon dioxide gas recycling line 7. The combustion exhaust gas contains a large amount of carbon dioxide, and serves as a supply source of carbon dioxide required for the battery reaction. Air from the air line 8 is supplied to the outlet side of the carbon dioxide gas recycle blower 32 to supply oxygen required for a cathode cell reaction. Part of the cathode exhaust gas discharged from the cathode is supplied to the cathode by the circulation line 3. The cathode exhaust gas, the combustion exhaust gas, and the air are mixed to form a cathode gas, which is supplied to the cathode.

【0005】このカソードガスは燃料電池20内で電池
反応して高温のカソード排ガスとなり、一部は循環ライ
ン3によりカソードを循環し、他の一部はカソード排ガ
スライン5により燃焼器23へ供給され、残部は排熱利
用ライン6で空気を圧縮する圧縮機を駆動するタービン
圧縮機28で動力を回収した後、さらに排熱回収蒸気発
生装置30で熱エネルギを回収して系外に排出される。
なお、この排熱回収蒸気発生装置30で発生した蒸気が
蒸気ライン9により燃料ガスライン1に入り、燃料ガス
と混合して改質器22に送られる。
The cathode gas undergoes a cell reaction in the fuel cell 20 to become a high-temperature cathode exhaust gas. A part of the cathode gas is circulated through the circulation line 3 and the other part is supplied to the combustor 23 through the cathode exhaust gas line 5. The remainder is recovered by a turbine compressor 28 that drives a compressor that compresses air in a waste heat utilization line 6, and then recovered by a waste heat recovery steam generator 30 to be discharged outside the system. .
The steam generated by the exhaust heat recovery steam generator 30 enters the fuel gas line 1 through the steam line 9, mixes with the fuel gas, and is sent to the reformer 22.

【0006】[0006]

【発明が解決しようとする課題】アノード排ガス中には
ドライベースで90%程度の炭酸ガスが含まれている。
この炭酸ガスは燃焼器23、加熱室を通り炭酸ガスリサ
イクルブロワ32によりカソードに供給され、電池反応
に必要な炭酸ガスが消費される。しかし余剰の炭酸ガス
はカソード排ガスとともにタービン圧縮機28に供給さ
れ、タービンを駆動後、排熱回収蒸気発生装置30で蒸
気を発生した後、大気に放出される。従来からアノード
排ガス中の炭酸ガスを回収するという考えはあったが、
燃焼器23へ供給されるアノード排ガスライン4に炭酸
ガス回収装置を設けると、アノード排ガスの流量は大幅
に減少する。これは炭酸ガス回収装置は通常アノード排
ガスを冷却して水分を凝縮し炭酸ガスを回収するためア
ノード排ガスに約50%(ウェット)の存在する水分が
ほとんど凝縮するためである。この流量減少と温度低下
により、電池での燃料利用率とプラント効率は低下す
る。また炭酸ガス回収両が過大な時は電池反応に必要な
炭酸ガスが不足するという問題がある。炭酸ガスの大気
放出削減はプラントの存続にかかわる重要な問題であ
り、発電量当たりの炭酸ガス排出量の低減が強く要望さ
れている。
The anode exhaust gas contains about 90% of carbon dioxide on a dry basis.
This carbon dioxide gas is supplied to the cathode through the combustor 23 and the heating chamber by the carbon dioxide gas recycle blower 32, and the carbon dioxide gas necessary for the battery reaction is consumed. However, the surplus carbon dioxide gas is supplied to the turbine compressor 28 together with the cathode exhaust gas, and after driving the turbine, the exhaust heat recovery steam generator 30 generates steam and then is released to the atmosphere. Conventionally, there was an idea to recover carbon dioxide in anode exhaust gas,
When the carbon dioxide gas recovery device is provided in the anode exhaust gas line 4 supplied to the combustor 23, the flow rate of the anode exhaust gas is greatly reduced. This is because the carbon dioxide gas recovery device usually cools the anode exhaust gas to condense water and recovers carbon dioxide gas, so that about 50% (wet) of water present in the anode exhaust gas is almost condensed. Due to this decrease in flow rate and temperature, the fuel utilization in the cell and the plant efficiency decrease. In addition, when both of the carbon dioxide gas recovery are excessive, there is a problem that the carbon dioxide necessary for the battery reaction is insufficient. Reduction of carbon dioxide emission to the atmosphere is an important issue related to the continuation of the plant, and there is a strong demand for reduction of carbon dioxide emission per power generation.

【0007】本発明は上述の問題に鑑みてなされたもの
で、アノード排ガス中の炭酸ガスについて、電池反応に
必要な炭酸ガスを除く残りの炭酸ガスを回収する炭酸ガ
ス回収装置付燃料電池発電装置を提供することを目的と
する。
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a fuel cell power generator with a carbon dioxide recovery device for recovering carbon dioxide in an anode exhaust gas excluding carbon dioxide necessary for a battery reaction. The purpose is to provide.

【0008】[0008]

【課題を解決するための手段】上記目的を達成するた
め、請求項1の発明では、カソードとアノードからなり
酸素を含むカソードガスと水素を含むアノードガスから
発電する燃料電池と、カソードから排出されるカソード
排ガスの一部とアノードから排出されるアノード排ガス
の一部とを燃焼する第1燃焼器と、この第1燃焼器の燃
焼排ガスで水蒸気を含む燃料ガスを改質する改質器と、
この改質器の燃焼排ガスをカソードに循環させる炭酸ガ
スリサイクルラインと、カソード排ガスの一部に前記炭
酸ガスリサイクルラインの燃焼排ガスと空気とを混合し
てカソードを循環させる循環ラインと、前記アノード排
ガスの残部より炭酸ガスを回収する炭酸ガス回収装置
と、この炭酸ガス回収装置からの排ガスと前記カソード
排ガスの残部とを燃焼する第2燃焼器と、この第2燃焼
器の燃焼排ガスでタービンを回転して空気圧縮機を駆動
し前記循環ラインに空気を供給するタービン圧縮機と、
を備える。
In order to achieve the above object, according to the first aspect of the present invention, there is provided a fuel cell comprising a cathode and an anode and generating electricity from a cathode gas containing oxygen and an anode gas containing hydrogen, and a fuel cell discharged from the cathode. A first combustor that burns a part of the cathode exhaust gas and a part of the anode exhaust gas discharged from the anode, a reformer that reforms a fuel gas containing steam with the combustion exhaust gas of the first combustor,
A carbon dioxide gas recycling line for circulating the combustion exhaust gas of the reformer to the cathode, a circulation line for mixing the combustion exhaust gas and the air of the carbon dioxide gas recycling line with a part of the cathode exhaust gas to circulate the cathode, and the anode exhaust gas , A second combustor that burns the exhaust gas from the carbon dioxide gas recovery device and the remainder of the cathode exhaust gas, and rotates the turbine with the combustion exhaust gas of the second combustor. A turbine compressor that drives an air compressor to supply air to the circulation line,
Is provided.

【0009】アノード排ガスから改質器の加熱およびカ
ソードが必要とする炭酸ガス量に対応するアノード排ガ
ス量を第1燃焼器に分岐し、残部を炭酸ガス回収装置に
供給する。炭酸ガス回収装置では加圧・冷却により炭酸
ガスを液化して取り出す等によりアノード排ガス中より
炭酸ガスを除去する。この炭酸ガス回収装置からの排ガ
スとカソード排ガスの残部とを第2燃焼器で燃焼し、こ
の燃焼ガスでタービン圧縮機のタービンを駆動した後、
タービン排ガスを最終的には大気放出する。第2燃焼器
には炭酸ガスをかなりの割合で除去したカソード排ガス
が供給されるので、燃焼ガスに含まれる炭酸ガスは従来
に比べ大幅に減少している。
From the anode exhaust gas, the amount of anode exhaust gas corresponding to the heating of the reformer and the amount of carbon dioxide required by the cathode is branched to the first combustor, and the remainder is supplied to a carbon dioxide recovery device. In the carbon dioxide gas recovery device, carbon dioxide gas is removed from the anode exhaust gas by liquefying and extracting carbon dioxide gas by pressurization and cooling. The exhaust gas from the carbon dioxide gas recovery device and the remainder of the cathode exhaust gas are burned in a second combustor, and the combustion gas drives a turbine of a turbine compressor.
The turbine exhaust gas is finally released to the atmosphere. Since the second combustor is supplied with the cathode exhaust gas from which the carbon dioxide gas has been removed at a considerable rate, the carbon dioxide gas contained in the combustion gas is significantly reduced as compared with the conventional case.

【0010】[0010]

【発明の実施の形態】以下、本発明の実施形態について
図面を参照して説明する。図1は本発明の実施形態の燃
料電池発電装置の全体構成図である。本図において図2
と同一機能を有するものは同一符号で表す。燃料電池発
電装置は、蒸気を含む燃料ガスを加熱する燃料予熱器2
4と、この加熱された燃料ガスを水素を含むアノードガ
スに改質する改質器22と、このアノードガスと酸素お
よび炭酸ガスを含むカソードガスとから発電する燃料電
池20とを備える。燃料電池20から排出されるアノー
ド排ガスの一部は、アノード排ガスライン4により第1
燃焼器23に供給され、酸素を含むカソード排ガスの一
部と共に燃焼触媒を用いて燃焼する。改質器22は加熱
室と改質室からなり、加熱室には第1燃焼器23からの
燃焼排ガスが供給され、改質室は水蒸気を含む都市ガス
を改質触媒と加熱室からの加熱により水素を含むアノー
ドガスに改質し、アノードガスライン2によりアノード
に供給する。加熱室より排出される燃焼排ガスには炭酸
ガスが含まれるので、この炭酸ガスを炭酸ガスリサイク
ルライン7により循環ライン3に供給する。循環ライン
3はこの炭酸ガスと空気ライン8により供給される酸素
とカソード排ガスの一部とを混合してカソードガスと
し、炭酸ガスリサイクルブロワ32によりカソードを循
環させる。循環ライン3の循環ガス量は流量制御弁42
により調整される。
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a fuel cell power generation device according to an embodiment of the present invention. In this figure, FIG.
Those having the same functions as those described above are denoted by the same reference numerals. The fuel cell power generator includes a fuel preheater 2 for heating fuel gas containing steam.
4, a reformer 22 for reforming the heated fuel gas to an anode gas containing hydrogen, and a fuel cell 20 for generating electricity from the anode gas and a cathode gas containing oxygen and carbon dioxide gas. A part of the anode exhaust gas discharged from the fuel cell 20 is supplied to the first exhaust gas line 4 by the anode exhaust gas line 4.
The fuel is supplied to the combustor 23 and burns using a combustion catalyst together with a part of the cathode exhaust gas containing oxygen. The reformer 22 includes a heating chamber and a reforming chamber. The heating chamber is supplied with the combustion exhaust gas from the first combustor 23, and the reforming chamber heats city gas containing steam from the reforming catalyst and the heating chamber. To an anode gas containing hydrogen, and supplies the anode gas through the anode gas line 2 to the anode. Since the combustion exhaust gas discharged from the heating chamber contains carbon dioxide gas, the carbon dioxide gas is supplied to the circulation line 3 by the carbon dioxide gas recycling line 7. The circulation line 3 mixes the carbon dioxide gas, oxygen supplied by the air line 8 and a part of the cathode exhaust gas to form a cathode gas, and circulates the cathode by a carbon dioxide gas recycle blower 32. The amount of circulating gas in the circulation line 3 is controlled by the flow control valve 42.
Is adjusted by

【0011】天然ガスを成分とする都市ガスは燃料ガス
ライン1により供給され、脱硫器26で硫酸分を除去さ
れた後蒸気ライン9からの蒸気と混合し、燃料予熱器2
4で加熱されて改質器22に入りアノードガスに改質さ
れて、アノードガスライン2により燃料電池20のアノ
ードに供給される。燃料電池20のカソードには、炭酸
ガスリサイクルライン7からの炭酸ガスと、空気ライン
8からの空気と、循環ライン3からのカソード排ガスと
が混合されてカソードガスとなり、炭酸ガスリサイクル
ブロワ32により供給される。燃料電池20はアノード
ガスとカソードガスを供給され発電を行う。アノードで
の反応により蒸気と未燃焼成分を含むアノード排ガスが
排出され、アノード排ガスライン4により一部は第1燃
焼器23に供給され、残部は炭酸ガス回収装置40に供
給される。燃焼器23と炭酸ガス回収装置40へのライ
ンを分けることにより、燃焼器23の燃料の流量減少、
温度低下を防ぐことができ、電池の燃料利用率低下をひ
き起こさない。カソードでの反応により生成さたカソー
ド排ガスは、一部は循環ライン3によりカソードへ循環
し、他の一部はカソード排ガスライン5により第1燃焼
器23に供給され、残部は第2燃焼器41に供給され
る。
A city gas containing natural gas as a component is supplied by a fuel gas line 1, and after removing sulfuric acid in a desulfurizer 26, is mixed with steam from a steam line 9 to form a fuel preheater 2.
The fuel gas is heated at 4, enters the reformer 22, is reformed into anode gas, and is supplied to the anode of the fuel cell 20 through the anode gas line 2. At the cathode of the fuel cell 20, carbon dioxide from the carbon dioxide gas recycling line 7, air from the air line 8, and cathode exhaust gas from the circulation line 3 are mixed to form a cathode gas, which is supplied by the carbon dioxide gas recycling blower 32. Is done. The fuel cell 20 is supplied with the anode gas and the cathode gas to generate power. Anode exhaust gas containing steam and unburned components is discharged by the reaction at the anode, and part of the exhaust gas is supplied to the first combustor 23 by the anode exhaust gas line 4, and the remainder is supplied to the carbon dioxide gas recovery device 40. By dividing the line to the combustor 23 and the carbon dioxide recovery device 40, the flow rate of fuel in the combustor 23 is reduced,
The temperature can be prevented from lowering, and the fuel utilization of the battery does not decrease. A part of the cathode exhaust gas generated by the reaction at the cathode is circulated to the cathode by the circulation line 3, another part is supplied to the first combustor 23 by the cathode exhaust gas line 5, and the remainder is the second combustor 41. Supplied to

【0012】第1燃焼器23には燃料電池20のアノー
ド排ガスの一部とカソード排ガスの一部が供給される。
燃料電池20の燃料利用率は80%程度なので、アノー
ド排ガスには20%程度の燃料成分が含まれている。カ
ソード排ガスには燃焼に必要な酸素が含まれている。こ
れらが第1燃焼器23で燃焼され高温の燃焼排ガスを生
成しこれを改質器22に供給する。改質器22で燃料ガ
スを加熱した後の燃焼排ガスには炭酸ガスが含まれ、こ
れはカソードでの電池反応に必要なので、炭酸ガスリサ
イクルライン7によりカソードへ供給される。
A part of the anode exhaust gas and a part of the cathode exhaust gas of the fuel cell 20 are supplied to the first combustor 23.
Since the fuel utilization of the fuel cell 20 is about 80%, the anode exhaust gas contains about 20% of the fuel component. Cathode exhaust gas contains oxygen necessary for combustion. These are burned in the first combustor 23 to generate high-temperature combustion exhaust gas, which is supplied to the reformer 22. The combustion exhaust gas after heating the fuel gas in the reformer 22 contains carbon dioxide gas, which is necessary for the battery reaction at the cathode, and is supplied to the cathode by the carbon dioxide gas recycling line 7.

【0013】炭酸ガス回収装置40はアノード排ガス中
に含まれる炭酸ガスを分離して取り出す装置で、幾つか
の方式があるが、一例として加圧・冷却し液化して取り
出す方法がある。本実施形態ではアノード排ガスを3M
Pa程度に加圧し、−40℃程度に冷却して炭酸ガスを
液化して分離して取り出す。なお、冷却にはLNG(液
化天然ガス)の気化の際の冷熱などを用いることにより
低コストで冷却を行うことができる。また炭酸ガス回収
量が過大になると電池反応に必要な炭酸ガスが不足する
という制約もない。
The carbon dioxide gas recovery device 40 is a device for separating and extracting carbon dioxide gas contained in the exhaust gas from the anode, and there are several methods. For example, there is a method of extracting the carbon dioxide gas by pressurizing, cooling and liquefying. In this embodiment, the anode exhaust gas is 3M
It is pressurized to about Pa, cooled to about −40 ° C., liquefied, separated and taken out of carbon dioxide gas. Note that cooling can be performed at low cost by using cold heat or the like at the time of vaporizing LNG (liquefied natural gas). In addition, there is no restriction that the amount of carbon dioxide required for the battery reaction becomes insufficient when the amount of recovered carbon dioxide becomes excessive.

【0014】炭酸ガス回収装置40で炭酸ガスを除去さ
れたアノード排ガスとカソード排ガスは第2燃焼器41
で燃焼して燃焼ガスとなり、タービン圧縮機28のター
ビンを駆動した後、排熱回収蒸気発生装置30へ供給さ
れる。排熱回収蒸気発生装置30では給水をタービン圧
縮機28のタービンを駆動した排ガスにより蒸気とし、
蒸気ライン9により燃料ガスライン1に供給する。排熱
回収蒸気発生装置30の排ガスは大気に放出されるが、
炭酸ガスは従来に比べ大幅に低減している。
The anode exhaust gas and the cathode exhaust gas from which the carbon dioxide gas has been removed by the carbon dioxide gas recovery device 40 are supplied to the second combustor 41.
The fuel gas is combusted by the fuel gas into a combustion gas, which is supplied to the exhaust heat recovery steam generator 30 after driving the turbine of the turbine compressor 28. In the exhaust heat recovery steam generator 30, the feed water is converted into steam by the exhaust gas that drives the turbine of the turbine compressor 28,
The fuel is supplied to the fuel gas line 1 by the steam line 9. The exhaust gas of the exhaust heat recovery steam generator 30 is released to the atmosphere,
Carbon dioxide gas has been significantly reduced compared to the past.

【0015】空気はタービン圧縮機28の圧縮機へ入
り、加圧されて空気ライン8に供給される。
The air enters the compressor of the turbine compressor 28 and is pressurized and supplied to the air line 8.

【0016】[0016]

【発明の効果】以上の説明より明らかなように、本発明
は、改質器の加熱や電池反応に必要な炭酸ガスを含むア
ノード排ガスを除いたアノード排ガスより炭酸ガスを回
収し、この炭酸ガスを除いた排ガスとカソード排ガスと
を燃焼して、この燃焼ガスのエネルギを回収した後、大
気に放出する。これによりプラント発電効率をあまり低
下させずに大気に放出される炭酸ガスを大幅に低減する
ことができる。
As is apparent from the above description, the present invention recovers carbon dioxide gas from the anode exhaust gas excluding the anode exhaust gas containing carbon dioxide gas necessary for heating the reformer and for the battery reaction. Exhaust gas and the cathode exhaust gas are removed, and the energy of the combustion gas is recovered and then released to the atmosphere. Thereby, the carbon dioxide gas released to the atmosphere can be significantly reduced without significantly lowering the power generation efficiency of the plant.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施形態の燃料電池発電装置の全体構
成図である。
FIG. 1 is an overall configuration diagram of a fuel cell power generation device according to an embodiment of the present invention.

【図2】従来の燃料電池発電装置の全体構成図である。FIG. 2 is an overall configuration diagram of a conventional fuel cell power generator.

【符号の説明】[Explanation of symbols]

1 燃料ガスライン 2 アノードガスライン 3 循環ライン 4 アノード排ガスライン 5 カソード排ガスライン 6 排熱利用ライン 7 炭酸ガスリサイクルライン 8 空気ライン 9 蒸気ライン 20 燃料電池 22 改質器 23 第1燃焼器 24 燃料予熱器 26 脱硫器 28 タービン圧縮機 30 排熱回収蒸気発生装置 32 炭酸ガスリサイクルブロワ 40 炭酸ガス回収装置 41 第2燃焼器 42 流量制御弁 DESCRIPTION OF SYMBOLS 1 Fuel gas line 2 Anode gas line 3 Circulation line 4 Anode exhaust gas line 5 Cathode exhaust gas line 6 Exhaust heat utilization line 7 Carbon dioxide gas recycling line 8 Air line 9 Steam line 20 Fuel cell 22 Reformer 23 First combustor 24 Fuel preheating Device 26 Desulfurizer 28 Turbine compressor 30 Exhaust heat recovery steam generator 32 Carbon dioxide gas recycle blower 40 Carbon dioxide gas recovery device 41 Second combustor 42 Flow control valve

───────────────────────────────────────────────────── フロントページの続き (72)発明者 小林 和典 東京都江東区豊洲3丁目1番15号 石川島 播磨重工業株式会社東二テクニカルセンタ ー内 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kazunori Kobayashi 3-1, 15 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 カソードとアノードからなり酸素を含む
カソードガスと水素を含むアノードガスから発電する燃
料電池と、カソードから排出されるカソード排ガスの一
部とアノードから排出されるアノード排ガスの一部とを
燃焼する第1燃焼器と、この第1燃焼器の燃焼排ガスで
水蒸気を含む燃料ガスを改質する改質器と、この改質器
の燃焼排ガスをカソードに循環させる炭酸ガスリサイク
ルラインと、カソード排ガスの一部に前記炭酸ガスリサ
イクルラインの燃焼排ガスと空気とを混合してカソード
を循環させる循環ラインと、前記アノード排ガスの残部
より炭酸ガスを回収する炭酸ガス回収装置と、この炭酸
ガス回収装置からの排ガスと前記カソード排ガスの残部
とを燃焼する第2燃焼器と、この第2燃焼器の燃焼排ガ
スでタービンを回転して空気圧縮機を駆動し前記循環ラ
インに空気を供給するタービン圧縮機と、を備えたこと
を特徴とする炭酸ガス回収装置付燃料電池発電装置。
1. A fuel cell comprising a cathode and an anode and generating electricity from a cathode gas containing oxygen and an anode gas containing hydrogen, a part of the cathode exhaust gas discharged from the cathode and a part of the anode exhaust gas discharged from the anode. A combustor, a reformer for reforming a fuel gas containing water vapor with the flue gas of the first combustor, a carbon dioxide gas recycling line for circulating the flue gas of the reformer to a cathode, A circulation line for mixing the combustion exhaust gas and air from the carbon dioxide gas recycling line with a part of the cathode exhaust gas to circulate the cathode, a carbon dioxide gas recovery device for recovering carbon dioxide gas from the remainder of the anode exhaust gas, A second combustor for combusting the exhaust gas from the device and the remainder of the cathode exhaust gas, and rotating the turbine with the combustion exhaust gas of the second combustor A turbine compressor that drives an air compressor to supply air to the circulation line.
JP30240597A 1997-11-05 1997-11-05 Fuel cell power generator with carbon dioxide recovery device Expired - Fee Related JP3865167B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30240597A JP3865167B2 (en) 1997-11-05 1997-11-05 Fuel cell power generator with carbon dioxide recovery device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30240597A JP3865167B2 (en) 1997-11-05 1997-11-05 Fuel cell power generator with carbon dioxide recovery device

Publications (2)

Publication Number Publication Date
JPH11144750A true JPH11144750A (en) 1999-05-28
JP3865167B2 JP3865167B2 (en) 2007-01-10

Family

ID=17908529

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30240597A Expired - Fee Related JP3865167B2 (en) 1997-11-05 1997-11-05 Fuel cell power generator with carbon dioxide recovery device

Country Status (1)

Country Link
JP (1) JP3865167B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008108435A1 (en) * 2007-03-06 2008-09-12 New Scientific R & D Institute Inc. Circulating internal pressure engine and power generation system
JP2016513866A (en) * 2013-03-15 2016-05-16 エクソンモービル リサーチ アンド エンジニアリング カンパニーExxon Research And Engineering Company Integrated operation of molten carbonate fuel cells.
CN115084602A (en) * 2022-08-23 2022-09-20 深圳市南科动力科技有限公司 Hydrogen emission treatment system and fuel cell

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008108435A1 (en) * 2007-03-06 2008-09-12 New Scientific R & D Institute Inc. Circulating internal pressure engine and power generation system
JP2016513866A (en) * 2013-03-15 2016-05-16 エクソンモービル リサーチ アンド エンジニアリング カンパニーExxon Research And Engineering Company Integrated operation of molten carbonate fuel cells.
CN115084602A (en) * 2022-08-23 2022-09-20 深圳市南科动力科技有限公司 Hydrogen emission treatment system and fuel cell
CN115084602B (en) * 2022-08-23 2022-11-15 深圳市南科动力科技有限公司 Hydrogen emission treatment system and fuel cell

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