Can I use a shower or hourly lounge in T2 of Beijing airport ?

Yes, hourly lounges are available between D2-3, B1, International Arrival Hall, T2. You can have a rest and take a shower there. You can book it by dialing 86-010-64598943； however, the resevation time is upmost 24h. A single room costs CNY260 for a stay of 6-8h and for longer stay, the fare is CNY300; a standard room costs CNY400 for a stay of 6-8h, and CNY480 for longer stay.

Thank you. I have another question. If I go there without reservation, can I use? (if they have a room.)

Of course. As long as they have empty rooms when you show up, you can use it.