Dense-phase carbon dioxide pipeline safety relief system and method

Abstract

The invention discloses a dense-phase carbon dioxide pipeline safety relief system and method. The safety relief system comprises a dense-phase carbon dioxide pipeline conveying and cutting system, avalve chamber bypass system, a two-stage relief system and a pipeline temperature and pressure detection system; the two-stage relief system is used for grading pressure relief of dense-phase carbon dioxide; and an interstage heat exchange system is arranged in the two-stage relief system and used for adjusting the temperature of a medium released from the previous stage. According to the dense-phase carbon dioxide pipeline safety relief system and method, based on the characteristics of a dense-phase carbon dioxide pipeline operation process, in combination with a conventional oil product pipeline maintenance relief scheme, in consideration of the characteristic of low-temperature solidification of the dense-phase carbon dioxide, the two-stage relief system, the interstage heat exchange system, a main line temperature detection system, a control system and other units, the risk of dry ice formation of a dense-phase carbon dioxide pipeline emptying system is effectively avoided, the material safety of a main line relief pipeline is effectively guaranteed, and safe relief of a dense-phase carbon dioxide pipeline is achieved.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide release, in particular to a system and method for safe release of dense-phase carbon dioxide pipelines. Background technique [0002] With the increasing demand for energy conservation, emission reduction and environmental protection in the energy and chemical industry and the improvement of carbon dioxide flooding technology, the long-distance transportation of carbon dioxide through pipelines has become an important way to promote and realize the efficient capture, storage and utilization of carbon dioxide. The critical temperature of carbon dioxide is about 31.1°C, and the critical pressure is about 7.38MPa.g. For long-distance pipeline transportation, the dense-phase transportation mode with a pressure higher than the critical pressure is usually used to improve the economy of transportation. In addition, carbon dioxide has the characteristics of solidification at low temperature, and t...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a more economical and reasonable way to safely discharge carbon dioxide in order to further promote the development of dense-phase carbon dioxide pipeline transportation technology and ensure safe operation in view of the above-mentioned problems, and to avoid The dry ice-induced blockage of the flow channel caused by the low temperature of the medium, to promote the development and progress of the industry's technological development and progress of the dense-phase carbon dioxide pipeline safety release system and method

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