Modification Technology Of Dry Gas Seal In Hydrogenation Unit

Dry gas seal is a kind of noncontact sea, It has been widely used in the high speed centrifugal compressor, because of the advantages of long service life, low power consumption, no leakage of the process medium, etc.Circulating hydrogen compressor seal of china at present is the use of FLOWSERVE company’s high-pressure dry gas seal products, facing the long delivery period and the high price, at present. Once the seal has an accident, there may be a situation where there are no spare parts of the unit, affectting the operation of the unit and device. In view of the current situation, this paper, Deceting both sides in the form of projects with high pressure dry gas seal system for circulating hydrogen compressor in co development.One wayPthe spiral groove in the case of excessive leakage, the formation of the gas film stiffness between the dynamic and static ring seal is still not enough, the end face has obvious friction marks. The type of T groove seal in the seal chamber gas is not uniform,less gas,the defect of easy contact of static and dynamic ring. Two-way "disabilities" word slot leakage is also excessive,but there is no contact trace of the moving and static ring end face, the size of the sealing leakage can be adjusted by adjusting the static pressure of the seal. But the premise is to ensure that the seal face no contact. The final results of this study choose two-way "disabilities" structure as the direction of this study.In addition, from the aspect of sealing surface material, the strength of the friction pair must satisfy the high pressure load, the material is reliable, the performance is reliable, and it meets the long period operation. The original seal sealing surface of a dynamic seal ring SiC-static seal ring of SiC coated by DLC friction surface matching technology, this kind of hard of hard sealing surface of and contact may be hard particle shedding possible, shedding of the hard particles and embedded in the sealing surface, resulting in further greater harm. This study using SiC ring- Graphite static ring sealing ring combination, due to the graphite materials of low hardness and excellent anti dry friction, self lubrication, making sealing ring even if the end of short contact time, also won’t cause static sealing surface ring further damage, sealing a large safety margin and the reliability is high.There will provide reliable sealing supply and technical support for the circulating hydrogen compressor in the refinery, the dry gas seal after the successful development of the test. Design, manufacture and testing will be in China, so the sealed price, delivery period, on-site response speed, quality of service will be a great advantage, providing guarantee for the stable operation of the leader of the unit. Meanwhile, we will get a large number of dry gas seal in the high-pressure field of application experience, laying the foundation for the application of high pressure dry gas seal in the high pressure centrifugal compressor, completely solving the high-pressure dry gas seal long-term dependenced on imports of the situation, bring huge economic and social benefits to the industry.