How to clean orphan session in WL 7

Why Weblogic 7 can't clean orphan sessions ?
I have one J2EE application using Struts 1.1. On both jsp and java code, cleaning session was carefully coded. However, some users just close browser and open session remains in WebLogic. In web.xml, session-timeout
is 30.
I have noticed orphan session is quite serious in WL7. Is there a method to force-clean it ?
Thanks,
Alex Lin

ALTER SYSTEM KILL SESSION 'X,X';
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