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Method of stopping indirect internal reforming solid oxide fuel cell

A solid oxide and fuel cell technology, applied in the direction of solid electrolyte fuel cells, fuel cells, fuel cell additives, etc., can solve the problems of SOFC performance deterioration, influx, and reformation cannot be guaranteed, and achieve the effect of stable anode temperature

Inactive Publication Date: 2013-04-17
JX NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] However, if the method described in the patent literature is used, reliable reforming cannot be guaranteed when the SOFC anode is kept in a reduced state using hydrogen-containing gas obtained by reforming hydrocarbon-based fuels.
That is, hydrocarbons that have not been reformed may be drawn out of the reformer and flow into the anode
[0015] Especially when higher hydrocarbons such as kerosene are used, if the higher hydrocarbons leak from the reformer and flow into the SOFC, the performance of the SOFC may deteriorate due to the precipitation of carbon.

Method used

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  • Method of stopping indirect internal reforming solid oxide fuel cell
  • Method of stopping indirect internal reforming solid oxide fuel cell
  • Method of stopping indirect internal reforming solid oxide fuel cell

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Experimental program
Comparison scheme
Effect test

no. 1 approach 》

[0285] A first embodiment of the stop method of the present invention will be described.

[0286] [FkE]

[0287] The flow rate of the hydrocarbon-based fuel supplied to the reformer (especially the reforming catalyst layer) in a state where the reforming can be stopped is expressed as FkE.

[0288] FkE can be obtained by experiments or simulations in advance. By changing the flow rate of water (including steam) for steam reforming or autothermal reforming, the flow rate of air for autothermal reforming or partial oxidation reforming, the flow rate of cathode air supplied to the reformer, providing The flow rate of fuel and air to the burner, the flow rate of fluid such as water or air supplied to the heat exchanger, etc., the flow rate of the fluid supplied to the indirect internal reforming type SOFC, and for heating the reformer, water or liquid fuel The output of electric heaters such as the evaporator, SOFC, and fluid supply piping, and the electrical input and output fr...

no. 2 approach 》

[0430] Next, a second embodiment of the stopping method of the present invention will be described.

[0431] [FkE]

[0432] The flow rate of the hydrocarbon-based fuel supplied to the reformer (especially the reforming catalyst layer) in a state where the reforming can be stopped is expressed as FkE.

[0433] FkE can be obtained by experiments or simulations in advance. By changing the flow rate of water (including steam) for steam reforming or autothermal reforming, the flow rate of air for autothermal reforming or partial oxidation reforming, the flow rate of cathode air supplied to the reformer, providing The flow rate of fuel and air to the burner, the flow rate of fluid such as water or air supplied to the heat exchanger, etc., the flow rate of the fluid supplied to the indirect internal reforming type SOFC, and for heating the reformer, water or liquid fuel The output of electric heaters such as the evaporator, SOFC, and fluid supply piping, and the electrical input an...

no. 3 approach 》

[0590] Next, a third embodiment of the stopping method of the present invention will be described.

[0591] [FkE]

[0592] The flow rate of the hydrocarbon-based fuel supplied to the reformer (especially the reforming catalyst layer) in a state where the reforming can be stopped is expressed as FkE.

[0593] FkE can be obtained by experiments or simulations in advance. By changing the flow rate of water (including steam) for steam reforming or autothermal reforming, the flow rate of air for autothermal reforming or partial oxidation reforming, the flow rate of cathode air supplied to the reformer, providing The flow rate of fuel and air to the burner, the flow rate of fluid such as water or air supplied to the heat exchanger, etc., the flow rate of the fluid supplied to the indirect internal reforming type SOFC, and for heating the reformer, water or liquid fuel The output of electric heaters such as the evaporator, SOFC, and fluid supply piping, and the electrical input and...

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PUM

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Abstract

Provided is a method for shutting down an indirect internal reforming SOFC, in which reliable reforming and the prevention of the oxidative degradation of the anode are possible. A 1 ) A reforming catalyst layer temperature T is measured; C 1 ) if T ‰¥ TrE, and there exists, among fuel flow rates Fk(j), a flow rate Fk(j) at which Tr(j) is equal to or less than T and which is equal to or more than Fk(1) and is less than FkE, then C 1 1) the flow rate of the fuel supplied to the reformer is set to Fk(J), where j that gives the minimum Fk(j) among the Fk(j) is represented as J; C 1 2) T is measured and compared with TrE; C 1 3) if T ‰¤ TrE, then the flow rate of the fuel supplied to the reformer is set to FkE and the method goes to D 1 ; C 1 4) if T > TrE, then T is compared with Tr(J); C 1 5) if T > Tr(J), then the method returns to C 1 2; C 1 6) if T ‰¤ Tr(J), then the flow rate of the fuel supplied to the reformer is increased to Fk(J+1) and J is increased by 1; C 1 7) after C 1 6, if J ‰  M, then the method returns to C 1 2, and if J = M, then the method goes to D 1 ; D 1 ) the method waits for the anode temperature to fall below an oxidative degradation temperature. TrE and the like are defined in the specification.

Description

technical field [0001] The present invention relates to a method of shutting down an indirect internal reforming solid oxide fuel cell having a reformer in the vicinity of the fuel cell. Background technique [0002] Generally, a solid oxide fuel cell (Solid Oxide Fuel Cell; hereinafter referred to as SOFC) includes a reformer and an SOFC, wherein the reformer is used to reform hydrocarbon-based fuels such as kerosene or city gas, and generate heavy The reformed gas is used as a hydrogen-containing gas; SOFC is used to electrochemically react the reformed gas with air to generate electricity. [0003] Usually, SOFC is operated at a high temperature of 550-1000°C. [0004] In reforming, various reactions such as steam reforming (SR), partial oxidation reforming (POX), and autothermal reforming (ATR) are used, but in order to use a reforming catalyst, it needs to be heated to a temperature at which the catalyst is active . [0005] Steam reforming is a very large endothermi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04C01B3/38H01M8/06H01M8/12
CPCH01M8/04365C01B3/384H01M8/04955Y02E60/50H01M8/04425C01B3/382H01M8/04776H01M8/04268C01B2203/066C01B2203/1609C01B2203/1619C01B2203/0244C01B2203/1685Y02E60/525C01B2203/0261H01M8/0637H01M2008/1293C01B2203/0233H01M8/2425H01M8/04228H01M8/04303C01B3/38H01M8/04H01M8/06H01M8/12H01M8/04373H01M8/04738
Inventor 旗田进
Owner JX NIPPON OIL & ENERGY CORP