Effect body lower effluent collecting device of low-temperature multi-effect seawater desalination device

The invention provides an effect body lower effluent collecting device of a low-temperature multi-effect seawater desalination device. The effect body lower effluent collecting device comprises a water collecting and pollution discharging sleeve; the water collection and pollution discharge sleeve comprises an inner pipe, an outer pipe and a collection chamber, one end of the outer pipe is communicated with a water-collecting downcomer at the bottom of the evaporator effect body, and the other end is communicated with the collecting chamber; the inner pipe penetrates through the collecting chamber, passes through the outer pipe and the water collecting descending pipe and extends into the evaporator effect body; an inner pipe upper closed section pipe orifice of the inner pipe is higher than a connecting end pipe orifice of the water collecting downcomer and the evaporator effect body; the inner pipe lower closed section of the inner pipe is communicated with a process pump inlet pipeline of a process pump of