Method for determining the flow rate of reactants in each cell of an electrochemical cell stack
专利汇可以提供Method for determining the flow rate of reactants in each cell of an electrochemical cell stack专利检索，专利查询，专利分析的服务。并且Method for determining the utilization of a reactant at the anode side or cathode side of a fuel cell. To this end a low flow with high utilization is applied at the side to be measured and an appreciable flow with low utilization is applied at the other side. A table is compiled in which the relationship between the Nernst voltage under the outlet conditions, such as the temperature, and the utilization of the reactant to be measured is incorporated. Cell voltage is then measured at the outlet and is equated to the Nernst voltage. The utilization can be determined from the table. This method can be used for determination of the flow rate and the flow distribution in a stack of electrochemical cells.，下面是Method for determining the flow rate of reactants in each cell of an electrochemical cell stack专利的具体信息内容。
What is claimed is:1. Method for determining the utilization of a reactant at an anode side or a cathode side of an electrochemical cell, which comprises:feeding through a first flow reactant at one of the cathode or anode side;feeding through a second flow reactant at the other of said anode or cathode sides, said first flow being higher than said second flow;setting a low average current density in the electrochemical cell;determining the cell voltage;compiling a table in which the temperature relationship between the Nernst voltage under outlet conditions of said cell and the utilization of the second flow reactant is incorporated;equating the Nernst voltage and the cell voltage; anddetermining the utilization from the table.2. The method according to claim 1, wherein the first flow reactant has a flow with an utilization of less than 25% at the set current density.3. The method according to claim 2, wherein the first flow reactant has a flow with an utilization of less than 10% at the set current density.4. The method according to claim 1, wherein the second flow reactant has a flow with an utilization greater than 50% at the set current density.5. The method according to claim 4, wherein the second flow reactant has a flow with an utilization greater than 75% at the set current density.6. The method according to claim 1, wherein the product of the average current density and local electrical resistance is less than 0.08 V, and wherein the current density at the outlet is less than 10 A/m.sup.2.7. The method according to claim 6, wherein the product of the average current density and local electrical resistance is 0.03 V.8. The method according to claim 1, wherein the step of compiling the table further comprises correcting the Nernst voltage for the utilization of the first flow reactant.9. Method for determining an ingoing flow rate of a reactant of an electrochemical cell, comprising determining the utilization in accordance with claim 1, and determining an inverse proportional utilization.10. Method according to claim 9, wherein the step of determining the inverse proportional utilization further comprises multiplying by the set electric current and dividing by the Faraday constant (F=96485 C/mol), the number of electrons involved in a specific reaction equation and a molecular fraction in the reactant for which the utilization has been determined.11. Method for determining the distribution of ingoing flow in a plurality of anode and/or cathode channels in a cell stack, comprising determining, under the conditions of claim 1, the utilization of each of the anode or cathode reactants, and determining a ratio of the inverse proportional utilization.12. Method for determining an outgoing flow rate, comprising determining the ingoing flow rate in accordance with claim 9, and introducing a correction of the degree of conversion of the reactant as a function of the set current.
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