Condensation operation state monitoring system of gas-phase polyethylene device

The utility model relates to a condensation operation state monitoring system of a gas phase polyethylene device. The device comprises a reactor, a recycle gas cooler and a compressor, an outlet of the circulating gas cooler is connected with an inlet of the reactor through a first pipeline; an outlet of the circulating gas cooler is further connected with a guide spraying pipe extending downwards, a guide spraying valve is arranged on the guide spraying pipe, the guide spraying pipe is further connected with a fourth pipeline used for reversely blowing ethylene into the first pipeline, the connecting position of the fourth pipeline and the guide spraying pipe is located on the upstream of the guide spraying valve, and a control valve set is further arranged on the fourth pipeline. When whether the system enters a critical state or not cannot be accurately judged in the switching process of a condensation state mode and a non-condensation state mode, the fourth pipeline can be closed through the control valve