Waste heat recovery system in olefin production

The invention belongs to the technical field of petrochemical equipment, and particularly relates to a waste heat recovery system in olefin production. The system comprises a washing tower. The bottomof the washing tower is successively connected to a tower pump, a scrubbing oil filter, a heat recovery heat exchanger and a water cooler through a pipeline. The water cooler is connected to the topof the washing tower through a pipeline. A fresh scrubbing oil supplementing pipe and a waste scrubbing oil discharge pipe are also connected to the pipeline, and the fresh scrubbing oil supplementingpipe is arranged behind the waste scrubbing oil discharge pipe. An olefin entering pipe is also connected to the bottom of the washing tower, and an olefin discharge pipe is also connected to the topof the washing tower; and the bottoms of the washing tower and the scrubbing oil filter are connected to a scrubbing oil dense discharge tank through an emptying pipeline, and the scrubbing oil densedischarge tank is also conne