Annular cooling formula selective catalytic reduction injection apparatus

Annular cooling formula selective catalytic reduction injection apparatus is including reductant entry joint, coolant liquid joint, sheath, neck bush, sprayer, base and sprayer positioning mechanism.The pore wall of the central through hole of base is equipped with annular boss, the upper end of sheath and the lower extreme detachably interconnect of reductant entry joint, the lower extreme of sheath stretches into in the central through hole of base to the up end of butt annular boss. The neck bush includes bushing body and bottom portion, in bushing body stretches into the central through hole of base, the centre bore pore wall of the outer peripheral face butt annular boss of bushing body upper end, bottom portion outwards extends along bushing body's lower extreme periphery, bushing body's upper end and bottom part do not and base sealing connection. The sprayer passes the central through hole of sheath, and during the cavity that the reductant entry connects was stretched into tothe upper end of sprayer,