Patent ID: 11964251
Assignee: SAWAFUJI ELECTRIC CO., LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC B  C  F  Y | IPC B  C  F

Claim 5:
6. A fuel-reforming method for supplying a fuel gas containing ammonia and hydrogen to a combustion device, the method comprising:
a step of determining mixing fractions of ammonia and hydrogen;
a step of reforming ammonia by a reformer to generate a high-concentration hydrogen gas having a hydrogen content of 99% or more;
a step of mixing ammonia and the high-concentration hydrogen gas to make a mixed gas; and
a step of supplying the mixed gas to the combustion device,
wherein the step of determining the mixing fractions of ammonia and hydrogen includes calculating, based on respective combustion rates of a reference fuel used in the combustion device, hydrogen, and ammonia, a combustion rate coefficient C of the mixed gas with respect to the reference fuel on the basis of equation (1)

[Math 5]

S0=SH×C+SA×(1−C)  Equation (1):

where S0 is the combustion rate of the reference fuel, SH is the combustion rate of hydrogen, SA is the combustion rate of ammonia, and C is the combustion rate coefficient of the mixed gas,
in addition, on the basis of equation (2), determining a volume fraction of hydrogen that is supplied to the mixing tank

[Math 6]

C=1−exp(−A×MB)  Equation (2):

where M is the volume fraction of hydrogen in the mixed gas, and A and B are constants, and
the mixing ratio of ammonia and the high-concentration hydrogen gas is (1−M):M.