关键词: 速度封, 分子封, 空气侵入, CFD模拟, 安全吹扫速度

Abstract: In elevated flare systems,when the waste gas discharge ends or runs at low flow rates,air infiltration often happens due to insufficient up-flowing momentum.This could lead to burnback and flashback and thus greatly harm the equipment and operation safety. In order to prevent air infiltration,the conventional practice in this industry is to inject purge gas into the system to increase the momentum of the flare gas. To save the amount of purge gas,sealing equipment such as velocity sealer or molecular sealer is often installed at the base of the flare header to better prevent the outside air from infiltrating into the torch cylinder. Although safe purge speeds are stipulated in some design specifications,the effects of the detailed structures of the equipment or the purge gas properties are not considered. In this paper,the air infiltration is studied by using CFD simulation and the effects of the sealing equipment in preventing air infiltration are analyzed. And the results can provide helpful guidance for selecting proper seal type and structure in actual industrial application.

Key words: Home｜Journal Papers｜About CNKI｜User Service｜FAQ｜Contact Us｜中文《Petrochemical Safety and Environmental Protection Technology》 2017-05Add to Favorite Get Latest Update CFD SIMULATION STUDY OF AIR INTRUSION IN ELEVATED FLARES WITH SEALING EQUIPMENTLiu Shijun