FIELD: petrochemical industry; may be used in plants for production of ethylene and propylene where carbon deposition is prevented by supplying of inhibitor solution to coil pipe. SUBSTANCE: unit includes straight part of coil pipe with raw material inlet, inhibitor sprayer, pipe supplying inhibitor to sprayer and additional pipe embracing the inhibitor supplying pipe, with pipes arranged coaxially. Unit is also provided with spray straightening device suppressing the large-scale turbulence downstream and located coaxially in straight part of coil pipe, in zone of injection of inhibitor solution. EFFECT: prevented burn-outs in coil pipe in zone of inhibitor solution injection. 5 cl, dwg
