Hydrogen-mixed natural gas pipeline valve chamber safe emptying system and method

Abstract

The invention discloses a hydrogen-mixed natural gas pipeline valve chamber safe emptying system and method. The system comprises a trunk line cutoff system, an emptying and emptying compensation system and an air replacement system. According to the system, the temporary air replacement system is arranged, the air in an emptying pipeline in the initial emptying process is exhausted, and thereforethe safe operation of the initial emptying stage is essentially guaranteed; an emptying velocity compensation system is adopted, and therefore the phenomenon that due to the fact that the pressure inthe pipeline is reduced in the emptying middle and later periods, the problems that the medium flow velocity is low, and then the pressure of the emptying pipe is reduced happen is avoided; and a flame arrester is arranged, and therefore the backfire resistance performance of the system is further improved. By means of the hydrogen-mixed natural gas pipeline valve chamber safe emptying system andmethod, the safe emptying of a valve chamber of the hydrogen-mixed natural gas pipeline is achieved. According to the hydrogen-mixed natural gas pipeline valve chamber safe emptying system and method, a facility which prevents the air in the emptying system from entering the valve chamber in the operating period is omitted, and due to the fact that the strict replacement and compensation emptyingfunction is set, the safety problem of the hydrogen-mixed natural gas in the valve chamber emptying process is solved.

Description

technical field [0001] The invention relates to a system and method for safely venting a hydrogen-mixed natural gas pipeline valve chamber. Background technique [0002] Hydrogen is one of the important development directions of new energy. Compared with traditional fossil fuels, hydrogen has the advantages of high calorific value, non-polluting combustion products, wide sources and renewable. It is called the clean energy of the future and will become the future of mankind. A new approach to solving growing energy and environmental problems. Hydrogen transportation is an important link in the utilization of hydrogen energy. The use of reliable pipelines to connect hydrogen sources and target users is the key to optimizing energy consumption and promoting hydrogen energy utilization. Compared with high-purity hydrogen pipelines (hydrogen content higher than 99%) directly laid to natural gas trunk pipelines (for long-distance transmission of natural gas trunk lines after mix...

AI Technical Summary

Problems solved by technology

For the hydrogen-mixed natural gas system, in the initial stage of venting, spontaneous combustion without ignition source diffusion caused by a large amount of medium entering the vent pipe may occur, frictional spontaneous combustion caused by severe friction between the medium and the pipe may also occur, or the medium may leave the vent standpipe When it is burned by external ignition near the nozzle; when burning occurs in the closed pipe, it is very easy to induce deflagration or explosion

At the same time, affected by the combustion characteristics of hydrogen, there may be stronger flashbacks in the vent pipeline than natural gas venting

Therefore, for large-scale stations with good venting conditions, the hydrogen-mixed natural gas can be safely discharged through the flare system, but for the venting system of the valve chamber of the hydrogen-mixed natural gas pipeline, due to the relatively poor supporting conditions, the safety of the venting system should be carried out. Research on economic allocation to ensure the safety of shorting, so as to make up for the gaps in existing technical reports and promote technological progress in this field

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