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GB/T 31886.1-2015 English PDF (GBT31886.1-2015)

GB/T 31886.1-2015 English PDF (GBT31886.1-2015)

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GB/T 31886.1-2015: Test method about the influence of gaseous contaminants in reaction gas on the performance of proton exchange membrane fuel cells -- Part 1: Gaseous contaminants in air

This Standard specifies the terms and definitions, test bench and instrumentation requirements, pre-test preparation, test method and test reports relevant to influence of SO2, NOx gaseous contaminants in the air on the performance of proton exchange membrane fuel cell.
GB/T 31886.1-2015
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 27.070
K 82
Test Method about the Influence of Gaseous
Contaminants in Reaction Gas on the Performance of
Proton Exchange Membrane Fuel Cell ?€?
Part 1. Gaseous Contaminants in Air
ISSUED ON. SEPTEMBER 11, 2015
IMPLEMENTED ON. APRIL 01, 2016
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword . 3
1 Scope .. 4
2 Normative References . 4
3 Terms and Definitions . 5
4 Test Bench and Instrumentation Requirements .. 6
5 Pre-Test Preparation .. 7
6 Test Methods .. 9
7 Test Report . 14
Appendix A (Informative) Test Report . 15
Test Method about the Influence of Gaseous
Contaminants in Reaction Gas on the Performance of
Proton Exchange Membrane Fuel Cell ?€?
Part 1. Gaseous Contaminants in Air
1 Scope
This Standard specifies the terms and definitions, test bench and instrumentation requirements, pre-test preparation, test method and test reports relevant to influence of SO2, NOx gaseous contaminants in the air on the performance of proton exchange membrane fuel cell.
This Standard is applicable to the proton exchange membrane fuel cell single cells (hereinafter referred to as ?€?fuel cell?€?) where the fuel is pure hydrogen (>99.9%) and the oxidant is air.
The volume fraction of gaseous contaminant in the air applicable to the test method described in this Standard is no less than 1??L/L.
2 Normative References
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.
GB 3095-2012 Ambient Air Quality Standard
GB/T 5274 Gas Analysis - Preparation of Calibration Gas Mixture - Gravimetric Method
GB/T 5275.10 Gas Analysis - Preparation of Calibration Gas Mixtures Using Dynamic Volumetric Methods - Part 10. Permeation Method
GB/T 3634.2-2011 Hydrogen - Part 2. Pure Hydrogen, High Pure Hydrogen and Ultrapure Hydrogen
as follows.
--- The effective area of the sample membrane electrode is 50cm2; the surrounding area outside the effective area shall be sealed;
--- The flow filed plate adopts pure graphite plate with a serpentine flow filed; --- The collector plate adopts the silver or gold coated stainless steel plate; --- Fuel cell manufacturer provides cathode anode catalytic layer platinum load. 5.2 Determination of test conditions
According to the atmospheric pressure test method specified in 6.7 of GB/T 20042.5- 2009, the following test conditions shall be determined.
--- The type of the used contaminants (X) and target contaminant concentration (cXd); --- The operating temperature of fuel cell. 75??C;
--- The test current densities are. 200 mA/cm2, 500 mA/cm2 and 800 mA/cm2; --- The lowest voltage in the fuel cell test (Umin). 0.3V;
--- The longest poisoning time (tdmax). 10h;
--- Hydrogen stoichiometric ratio is 1.2; relative humidity is 100%; while the outlet back pressure is 0MPa;
--- Air stoichiometric ratio is 2.5; relative humidity is 100%; while the outlet back pressure is 0MPa;
--- The continuous sampling interval for each parameter during the test shall not exceed 1min; thereof, the continuous sampling interval of voltage and current shall not exceed 10s.
5.3 Preparation of reaction gas
This Standard adopts the dilution method and obtain the air with gaseous contaminant volume fraction of cXd. Prepare the gaseous contaminant with volume fraction cX0; mix it with clean air as per certain dilution ratio, so as to obtain the volume fraction of the gaseous contaminants for the test specified by the fuel cell manufacturer. After diluting the air containing the gaseous contaminant, the volume percentage of contaminant shall be 1%~5% before the dilution.
The volume fraction (cX0) of the gaseous contaminant in the air before dilution shall be calculated as per Formula (1).
Where.
cX0 ?€? volume fraction of gaseous contaminant in air before dilution;
cXd ?€? volume fraction of gaseous contaminant for test specified by the fuel cell manufacturer;
d ?€? dilution ratio; namely, contaminant volume fraction ratio before and after dilution. The fuel cell test method shall be based on the volume fraction (cXd) of gaseous contaminant specified by the manufacturer, select appropriate dilution ratio (d), then calculate the volume fraction (cX0) of the prepared gaseous contaminant in air as per the Formula (1).
The fuel that shall be prepared in the test of this Standard is pure hydrogen, the oxidant is clean air and air with volume fraction of gaseous contaminant of cX0. Pure hydrogen. prepare enough high-purity hydrogen, the quality of which shall be above that required by GB/T 3634.2-2011; and take such hydrogen as the pure hydrogen source for test.
Clean air. prepare enough clean air (oxygen volume fraction shall not exceed 21% ?? 0.2%) as per the provisions of GB/T 5274 or GB/T 5275.10 and take it as the clean air source for test.
Air containing gaseous contaminant. according to GB/T 5274 or GB/T 5275.10 and calculation results of Formula (1), prepare the air only containing selected gaseous contaminant (X) and the volume fraction is cX0, take it as the air source containing gaseous contaminant.
5.4 Test sample quantity and requirements
Sampling quantity. at least 9 pieces (no less than 3 samples for each test item). Requirements. samples sampled from the same batch shall be ensured the same structure and comparable performance.
6 Test Methods
6.1 General
This Part gives the test methods for the influence of gaseous contaminant in air on the performance of the fuel cell; this test shall be carried out on the test bench rack shown in Figure 1. Firstly, divide the samples into 3 groups as per the different operating 6.3 Data processing
6.3.1 General
The test in this Standard is performed under constant current; when judging the fuel cell performance before and after the poisoning, the voltage change shall be taken as the reference basis. According to the data of this test, the average voltage on steady state phase, average voltage after poisoning, average poisoning time, and attenuation amplitude can be calculated.
6.3.2 Steady state performance
The arithmetic mean value of the voltage of the fuel cell sample i in the steady state operating phase shall be calculated as per the Formula (4); it is used to characterize the steady state performance of the fuel cell.
Where.
n ?€? quantity of fuel cell samples for test;
Uwi ?€? average voltage of sample i on the steady state phase, in V;
- average steady state voltage of all samples, in V.
6.3.3 Fuel cell performance after poisoning
The voltage value reached at the end of the poisoning phase of the fuel cell sample i is used to characterize the fuel cell performance of the sample i after poisoning; The average performance of the poisoned sample is obtained by calculating the arithmetic average of the Udi of the different samples according to the formula (5). Where.
n ?€? quantity of fuel cell samples for test;
Udi ?€? fuel cell voltage after sample i is poisoned, in V;
- average post-poisoning voltage of all samples, in V.
6.3.4 Average poisoning time ( )
?€? average attenuation amplitude of all samples, %.
6.3.6 Performance attenuation curve
Take the voltage operated on the tb ~ tc phase of the fuel cell sample i as the ordinate; take time as abscissa (take tb as the zero point for time), then draw the poisoning performance attenuation curve of the sample i; the poisoning performance attenuation curves of different samples can be drawn in the same diagram. Through comparing the performance attenuation curves of different fuel cell samples, the anti-poisoning performance of different fuel cell samples can be distinguished roughly. 6.3.7 Recovery ratio
After the fuel cell sample i finishes the recovery phase test specified in 6.2.4, take the arithmetic average value of the fuel cell voltages before 5min of the end time; compare it with the steady state performance (Uw), then obtain the recovery percentage, and the calculation can refer to Formula (9).
Where.
??Uri ?€? recovery ratio of sample i recovery, %;
Uwi ?€? average voltage of sample i on steady state phase, in V;
Uri ?€? average performance of fuel cell before 5min at the end time of sample i recovery phase test, in V.
7 Test Report
Proton exchange membrane fuel cell manufacturer can use this Standard to evaluate the anti-air-contaminant poisoning performance of its products; the test report shall include the following contents.
a) Basic information and manufacturer name of fuel cell;
b) Detailed test conditions, process and results;
c) Other information required by the tester to be noted.
The test report can be written in the format given in Appendix A.

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