Flight from Uk to Bejing then cruise from Tianjin

I am flying into Beijing on 4th October from the UK, then joining a cruise ship in Tianjin on 7th October. The first stop after joining the cruise will be in Japan, however we will be visiting Hong Kong as one of the ports of call on the 13th October. The cruise ship will continue and end in Singapore on 19th October. Can you confirm that I am eligible to apply for the 144 hour visa Free transit. Thanks