Water　wall　design　is　a　key　issue　for　supercritical　Circulating　Fluidized　Bed　(CFB)　boiler.　On　account　of　the　good　heat　transfer　performance,　rifled　tube　is　applied　in　the　water　wall　design　of　a　600　MW　supercritical　CFB　boiler　in　China.　In　order　to　investigate　the　heat　transfer　and　frictional　characteristics　of　the　rifled　tube　with　vertical　upward　flow,　an　in-depth　experiment　was　conducted　in　the　range　of　pressure　from　12　to　30　MPa,　mass　flux　from　230　to　1200　kg/(m(2)　s),　and　inner　wall　heat　flux　from　130　to　720　kW/m(2).　The　wall　temperature　distribution　and　pressure　drop　in　the　rifled　tube　were　obtained　in　the　experiment.　The　normal,　enhanced　and　deteriorated　heat　transfer　characteristics　were　also　captured.　In　this　paper,　the　effects　of　pressure,　inner　wall　heat　flux　and　mass　flux　on　heat　transfer　characteristics　are　analyzed,　the　heat　transfer　mechanism　and　the　frictional　resistance　performance　are　discussed,　and　the　corresponding　empirical　correlations　are　presented.　The　experimental　results　show　that　the　rifled　tube　can　effectively　prevent　the　occurrence　of　Departure　from　Nucleate　Boiling　(DNB)　and　keep　the　tube　wall　temperature　in　a　permissible　range　under　the　operating　condition　of　supercritical　CFB　boiler.　(C)　2010　Elsevier　Inc.　All　rights　reserved.