Gas-power interconnection system based on reversible fuel cell under compound gas condition

Abstract

The invention discloses a gas-power interconnection system based on a reversible fuel cell under a compound gas condition. The gas-power interconnection system comprises a reversible fuel cell and a natural gas conveying pipeline connected with the reversible fuel cell through a hydrogen-methane-carbon monoxide conveying pipeline; the reversible fuel cell is communicated with a hydrogen filling station and a hydrogen storage tank through hydrogen conveying pipelines; a pressure reduction station is arranged at the upstream of the hydrogen-methane-carbon monoxide conveying pipeline connected with the natural gas conveying pipeline; the gas-power interconnection system also comprises a power grid which is jointly communicated with the reversible fuel cell and the natural gas conveying pipeline; a reconstructed compound gas pipeline and users at the downstream form a natural gas distribution network with injection of hydrogen, methane and carbon monoxide. According to the gas-power interconnection system, under the condition of not changing the existing technical conditions, the hydrogen injection ratio is not greater than 17%; meanwhile, a compound gas composed of hydrogen, methane and carbon monoxide is injected into a natural pipe network so as to obtain an injection ratio being higher than that of injection of pure hydrogen, so that the overall injection amount of the fuel isincreased, and the overall power-gas conversion power of the system is improved.

Description

technical field [0001] The invention relates to the intersection field of electricity / gas multi-energy system and clean new energy management, in particular to a gas / electricity interconnection system based on a reversible fuel cell under compound gas conditions. Background technique [0002] Aiming at the problems of fossil energy depletion and environmental pollution in today's society, in order to achieve optimal control and efficient utilization of various energies, a multi-energy system involving tightly coupled systems involving various energy flows such as electricity, heat, and gas is the future energy form. To this end, a new energy system integrating source, storage and load must be established. [0003] With the increasing scarcity of energy, hydrogen energy is considered to be the clean energy with the most development potential in the 21st century because of its advantages such as abundant sources, renewable, high energy density and clean combustion. However, i...

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Problems solved by technology

And because of the poor safety of hydrogen storage in this method, the hydrogen storage tank must be installed far away from the urban area, and the hydrogen storage capacity is limited. The cost of building a large-scale hydrogen storage device is high and the transportation is inconvenient.

[0005] The large-scale and stable transportation of hydrogen depends on the construction of expensive hydrogen transmission pipelines. However, hydrogen and methane have significant differences in energy density, calorific value, and permeability. Using natural gas pipelines to transmit hydrogen energy is a more economical transportation method, and, When the hydrogen content is less than 17%, it will not adversely affect the existing natural gas pipeline facilities, but it limits the power of hydrogen production and the efficiency of energy interconnection

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