Protective device for prolonging service life of bed temperature thermocouple of circulating fluidized bed boiler

The utility model belongs to the technical field of bed temperature thermocouple protection, and discloses a protective device for prolonging the service life of a bed temperature thermocouple of a circulating fluidized bed boiler. The protective device comprises a protective main body and a sleeve main body, wherein the protective main body is formed by integrally welding a bottom plate made of 310S stainless steel, a herringbone baffle plate, a web reinforcing rib and an outer inserting sleeve; the sleeve main body is formed by integrally welding a protective sleeve made of 310S stainless steel, a supporting rib and a plugging ring; wherein the herringbone baffle plate is arranged above a bed temperature thermocouple probe to form a primary protection, and the protective sleeve and the outer insertion sleeve are added to form another protection, so that the double protection can not only avoid direct scouring of materials adhered to the wall, but also reduce indirect abrasion of falling materials to a hotbe