Hydrogen energy utilization gas mixing system and hydrogen and natural gas proportioning control method

Abstract

The invention discloses a hydrogen energy utilization gas mixing system and a hydrogen and natural gas proportioning control method, and relates to the technical field of renewable energy utilization.Source hydrogen enters a gas mixing pipeline and passes through an inlet ball valve, a pneumatic cut-off valve and a filter, the hydrogen flow is metered through a flow meter, the hydrogen consumption is adjusted through an adjusting valve, and then the hydrogen enters a gas mixing device through an outlet ball valve; source natural gas enters the gas mixing pipeline, passes through the inlet ball valve and a filter stop valve, is pressure-regulated and metered, reaches the outlet ball valve via the adjusting valve and then enters a gas mixing device; and detection equipment at a mixed gas outlet is matched with the flow value after temperature and pressure compensation to jointly control the opening degree of an adjusting valve on a natural gas and hydrogen pipeline and control the volume flow of hydrogen, online adjustment and automatic following of the hydrogenation amount are conducted, and natural gas and hydrogen proportioning is achieved. According to the invention, a stable gas mixing ratio of two gases is realized, the mixing precision is high, the equipment is integrally skid-mounted, and a stainless steel box body with heat preservation and noise reduction functions isexternally arranged, so that the equipment is compact and attractive, and is convenient to install and migrate.

Description

technical field [0001] The disclosure of the present invention relates to the technical field of renewable energy utilization, in particular to a hydrogen energy utilization gas mixing system and a method for controlling the ratio of hydrogen and natural gas. Background technique [0002] At present, the hydrogen energy utilization industry will develop rapidly. By building a hydrogen energy industry chain, we can promote the overall development of the new energy industry, build high-end application demonstrations of new energy, and comprehensively upgrade the energy consumption structure. Adding hydrogen to natural gas is one of the main forms of hydrogen energy utilization. The hydrogen produced by electrolysis of renewable energy and the excess hydrogen generated under the full-load operation of the hydrogenation station are injected into the natural gas pipeline network to form hydrogen-doped natural gas, and then passed through the pipeline. The network will transport h...

AI Technical Summary

Problems solved by technology

[0005] Gas-hydrogen mixing is a new type of device system at home and abroad, and there are many data indicators that need to be verified by reliable tests. (1) Most of the gas mixing currently in operation is to control the flow ratio of the two gases to achieve the required gas mixing ratio. When the total flow rate changes, the mixing accuracy will be greatly affected, the operation will be unstable, the signal feedback will be slow, and the control system will be imperfect, which will cause danger to the back-end gas consumption

(2) The front-end treatment of high-pressure hydrogen by the equipment is unreasonable, including unreasonable material selection, selection and setting of filter and pressure regulating devices, etc., resulting in unstable operation of the hydrogen circuit and large pressure fluctuations

(3) There is no uniform standard for the form and structural design of the mixer, the production is rough, and the mixing uniformity is low, resulting in a huge error in the mixing accuracy

[0006] Through the above analysis, the problems and defects of the existing technology are as follows: (1) The existing natural gas hydrogenation equipment has poor operation effect; and the gas mixing scheme of dual gas mixing with flow rate is not adopted, resulting in unreliable technical performance and poor process operation. Internal stability, low level of security controls

[0007] (2) In the prior art equipment, there is no front-end hydrogen high-pressure treatment, no reasonable selection of materials for hydrogen pipeline components, poor coordination and joint control of flow and components, poor gas mixing uniformity, slow signal feedback, etc., resulting in gas mixing devices Can not fully meet the practical application

[0010] (4) The properties of hydrogen and methane are quite different, especially in terms of combustion performance. If the mixing uniformity of the two gases is low, or stratification occurs in the back-end pipeline, the Wobbe number and combustion potential of the mixed gas will be disturbed. Both gases are flammable and explosive media, which will easily lead to the safety of hydrogen equipment. Therefore, the gas mixing uniformity of the static mixer, the core gas mixing component, must reach more than 98% to ensure uniform gas mixing. At the same time, the control principle must also be Ensure the precise mixing ratio of the two washes, fast response, and reliable safety interlock

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