How can I book an hourly hotel room in the airport, where is it located and what are the rates?

Well, in my opinion, it is not necessary to reserve in advance. You can directly check in upon your arrival. The hourly lounges are located in 2nd Floor of the west of the domestic arrival hall.

Here is the fare:
Standard room costs CNY60 within 4 hours and CNY360 for 5-24 hours and the overnight cost is CNY360.
Suit room costs CNY80 within 4 hours and CNY480 for 5-24 hours and the overnight cost is CNY480.