NOVELTY - Device comprises a refrigeration circulating system, landfill gas circulation system and monitoring and controlling system. The refrigerating circulation system comprises a compressor (1), a gas-liquid separator, a condenser (2), evaporator and expansion valve, a drying filter (6), and multiple valve and pipeline. The two evaporators are connected in parallel manner. The inlet of parallel pipeline through three-way valve (12) is connected with glass. A drying filter and an outlet of condenser in parallel through tee valve (18) are orderly connected with gas liquid separator and a compressor.    USE - The device is useful for removing siloxane in combustion gas, and removing the rubbish landfill and impurities e.g. water.    ADVANTAGE - The device acquires refrigeration process and the defrosting process at the same time.    DETAILED DESCRIPTION - Device comprises a refrigeration circulating system, landfill gas circulation system and monitoring and controlling system. The refrigerating circulation system comprises a compressor (1), a gas-liquid separator, a condenser (2), evaporator and expansion valve, a drying filter (6), and multiple valve and pipeline. The two evaporators are connected in parallel manner. The inlet of the parallel pipeline through three-way valve (12) is connected with glass. A drying filter and a outlet of the condenser in parallel through tee valve (18) are orderly connected with gas liquid separator and a compressor. The landfill gas circulating system comprises a pre-cooling heat exchanger. The two parallel evaporator refrigeration circulating system of the pipeline, a drain device and multiple valves are parallelly connected to inlet and outlet pipeline of two shunt-wound evaporator via the three-way valve. The pre-cooling heat exchanger is connected to the third drain device connected with the pre-cooling heat exchanger. The monitoring and control system includes multiple sensing device, a pressure meter and a valve. The sensing device are respectively set on the pre-cooling heat exchanger and the two evaporator are connected in parallel, further is set on the outlet of the pipeline of the two shunt-wound evaporator. The control system controls the opening and closing of the valve according to the feedback value which produces the desired stack temperature.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the device for removing siloxane in combustion gas.    Compressor (1)    Condenser (2)    Drying filter (6)    Three-way valve (12)    Tee valve (18)