This utility model relates to the field of
waste heat recovery technology, specifically to a
waste heat recovery device for engine exhaust of a single-screw expander, comprising a heating component, a shell component, a heat insulation component, an exhaust component, and a heat insulation sleeve. The exhaust component is located outside the heating component, and the heat insulation component and the exhaust component are located outside the heat insulation component and the heat insulation sleeve. The shell component is located outside the heat insulation component and the heat insulation sleeve. The heating component consists of a heating tank, a first upper cover, a liquid inlet, and a liquid outlet. The shell component consists of a shell, a second upper cover, and a connecting
pipe, with the second upper cover connected to the upper end of the shell. Connecting pipes are connected to the upper and lower parts of one side of the shell. The heat insulation component consists of multiple sets of spliced sleeves, with multiple sets of limiting grooves inside each spliced sleeve. The exhaust component consists of an inlet
pipe, a spiral
pipe, and an outlet pipe, with an inlet pipe connected to the upper part of the spiral pipe and an outlet pipe connected to the lower part of the spiral pipe.