Trimeric sodium phosphate tail gas washing device

The utility model discloses a trimeric sodium phosphate tail gas washing device, which consists of a tail gas system and a spray water system, wherein the tail gas system comprises a cyclone separator (1), a heat pipe air preheater (2), an induced draft fan (3), a semi-annular joint water seal (4), a vertical sprayer (5), a sprayer tower (6) and a chimney (7), wherein a polymerization furnace (13) is connected with the cyclone separator (1) through a tail gas pipeline; a pipeline is connected with the heat pipe air preheater (2), the induced draft fan (3) and the semi-annular joint water seal (4) in sequence; the water seal (4) is directly connected with the vertical sprayer (5); the vertical sprayer (5) is connected to the lower part of the spray tower (6); the top of the spray tower (6) is provided with a rotational flow plate (8); the chimney (7) is arranged on the rotational flow plate (8); the spray water system comprises a lye tank (9), a washing water groove (10), a water pump (11) and a washing water