Multi-functional natural gas and hydrogen mixing gas station and filling method

Abstract

The invention relates to a multi-functional natural gas and hydrogen mixing gas station and a filling method and aims to provide a multi-functional mixing gas station for hydrogen and natural gas and a filling method to realize real-time and high-precision proportion-adjustable mixing filling of hydrogen and natural gas. A multi-functional high-pressure natural gas and hydrogen gas station system comprises a natural gas supply system, a hydrogen supply system, at least one gas mixing filling machine and a supervisory control and data acquisition (SCADA) system.

Description

Technical field [0001] The invention relates to the technical field of gas filling, in particular to a multifunctional mixed gas filling station and filling method of natural gas and hydrogen. Background technique [0002] In today's era of increasing energy demand and stricter emission regulations, the transformation of the automotive energy structure is urgent. In recent years, there have been more and more researches on the use of alternative fuels to achieve energy saving and emission reduction in the automotive industry. As an alternative fuel, natural gas has the advantages of large reserves, high octane number, low emissions, and low price. Hydrogen also has a flame propagation rate. Fast, wide fire range, low exhaust pollution (that is, only a small amount of NO x , Does not produce hydrocarbons, CO and greenhouse gas CO 2 )The advantages. However, natural gas has shortcomings such as narrow fire range, slow flame propagation, and low engine thermal efficiency. Compared...

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Problems solved by technology

At present, domestic research on HCNG does not involve industrialization, and basically stays at the stage of engine research and project demonstration. At this stage, there are very few HCNG filling stations with single functions and poor energy efficiency.

[0003] For example, in "Research on Mixing Process of Natural Gas with Hydrogen" (Gas and Heat, Issue 08, 2009, Qiao Weiyan, Zhang Ning, Xie Donglai), "Design and Realization of HCNG Filling Station" (China and Foreign Energy, Issue 07, 2013, Zhao Wenhao , Chen Gang), production, diversion / use and European patent application EP20070763143 (publication number: EP1994266A4) and other documents mentioned in the HCNG station technological process adopts pressurization first, then mixing, then storage, and finally the steps of filling, this process Special gas mixing equipment is required for the pre-mixing of hydrogen and natural gas, which increases equipment investment and floor space; in addition, in most cases, due to the different pressure levels of hydrogen and natural gas sources used to mix and generate HCNG, in order to ensure The mixing of the two gases will reduce the hydrogen and natural gas to the same pressure level before mixing, and then pressurize after mixing, which will reduce the energy efficiency of the entire gas filling station; finally, using the pre-mixing process, often Storage tanks for HCNG mixed gas are required, and HCNG mixed gas may have gas stratification during long-term storage, resulting in uneven density, which will affect the combustion and emission characteristics of the vehicle after being filled into HCNG vehicles

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