GB/T 34593-2017Test methods of hydrogen emission for fuel cell engine (English PDF)

4.1 Fuel cell engine requirements

Fuel cell engine shall meet the following requirements. […]

5.1.2 Test methods

Test methods shall meet the following requirements.

a) Select 11 operating points within the range of fuel cell engine operating, including idle state, 10%PE, 20%PE, 30%PE, 40%PE, 50%PE, 60%PE, 70%PE, 80%PE, 90%PE, PE;

b) The fuel cell engine carries out heating engine, after the process of heating engine finishes, return to idle state and operate for 10s;

c) Load to pre-determined operating points according to the specified loading method, and at least continuously and stably operate for 3 minutes at each operating point;

d) The time duration of analyzing data for each operating point cannot be less than 2 minutes.

Note: PE --- rated power.

5.1.3 Data measured and recorded during the test

Data measured during the test. hydrogen flow, fuel cell stack voltage, fuel cell stack current, etc.

5.1.4 Test result processing

Conduct test result processing for the actual hydrogen consumption of fuel cell stack, the theoretical hydrogen consumption of fuel cell stack, hydrogen emission load, and hydrogen emission rate according to the methods provided in Appendix A.

5.2 Hydrogen emission load test under cycle conditions

5.2.1 Test conditions

Before the test, fuel cell engine is in hot state, and the heating engine method is performed according to the method specified in GB/T 24554. The test process shall be conducted automatically and there shall be no manual intervention.

5.2.2 Test methods

The test is carried out as follows.

a) The fuel cell engine carries out heating engine, after the process of heating engine finishes, return to idle state and operate for 10s; T1 - Start time, in seconds (s); T2 - End time, in seconds (s). The theoretical hydrogen flow is calculated according to Faraday's formula.

Where. qH2_theo - The theoretical hydrogen flow of fuel cell stack, in grams per second (g/s); M - Hydrogen molar mass, 2.016 g/mol; I - Fuel cell stack current, in Ampere (A);

N - The single-cell number of fuel cell stack; n -The number of electrons released by each hydrogen molecule, 2; F - Faraday constant, 96485 C/mol.

A.3 Hydrogen emission load

The hydrogen emitted by fuel cell stack during a certain period of time is calculated according to formula (A.4).

Where. mH2_emis - The mass of the emitted hydrogen, in grams (g); mH2 - The measured hydrogen consumption of fuel cell stack, in grams (g); mH2_theo - The theoretical consumption mass of hydrogen, in grams (g).

A.4 Hydrogen emission rate

The hydrogen emission rate of fuel cell stack during a certain period of time is calculated according to formula (A.5).

Where. bH2_emis - Hydrogen emission rate, in grams per kWh [g/(kW·h)]; […]