Is it possible to send more than 150 emails in a day when sending a sequence?

Yes, as long as you have the permissions and the persons are added to the sequence properly in the setup. They will all go out in one batch, then the next email will go at the next scheduled time and so forth. This is a setup once, then let it go kind of email marketing piece. You can stop it, remove individuals, remove or adjust the sequences as long as it hasn't been sent.