Aiming　at　the　problem　of　organic　heat　carrier　boiler　coil＇s　over-temperature　coking,　heat　transfer　analysis　of　the　organic　heat　carrier　helical　coil　are　carried　out　to　study　how　the　spiral　characteristic　parameters,　thermal　oil　viscosity　and　flow　rate　to　affect　helical　coil＇s　heat　transfer　capabilities.　The　results　show　that:　among　the　factors　affecting　the　convective　heat　transfer　capacity　of　the　spiral　coil,　the　most　obvious　is　the　thermal　oil＇s　flow　rate,　followed　by　thermal　oil＇s　viscosity,　helical　coil　tube　diameter　has　a　certain　influence　on　the　heat　transfer　capability,　the　curvature　and　pitch　of　the　spiral　coil　diameter　has　little　influence　on　the　heat　transfer　capability.　©　2015,　Lanzhou　Petroleum　Machinery　Research　Institute.　All　rights　reserved.