Tin smelting flue gas online analysis sample gas pretreatment device and pretreatment method

The invention discloses a tin smelting flue gas online analysis sample gas pretreatment device and pretreatment method. The device comprises a gas-liquid separation system, a heat exchange cooling anddewatering system and a drying and filtering system, wherein the gas-liquid separation system comprises a gas-liquid separator (1), a sample gas inlet pipe (2), a liquid discharge pipe (3) with an electromagnetic valve (4) and a liquid level switch (5); the heat exchange cooling and dewatering system comprises a vortex tube cooler (6), a compressed air tube (8) with a micro-adjusting valve (9), aheat exchange barrel (11) and a cold cavity (10) which are connected with the vortex tube cooler, a primary dryer (12) connected with the cold cavity, and a peristaltic pump (15) at the bottom of thecold cavity; the gas-liquid separator is connected with the cold cavity through a sample gas conveying pipe (14); and the drying and filtering system comprises a secondary dryer (16) connected with the cold cavity through a pi