Gas internal combustion engine distributive energy denitration and silencing integral device

The invention discloses a gas internal combustion engine distributive energy denitration and silencing integral device for smoke discharge of a gas internal combustion engine in distributive energy. The denitration and silencing integral device integrates two process links of denitration and silencing therein; a sudden expansion reaction chamber is formed in the integral device; one end of the device is connected with a mixing pipe section communicated with smoke input, and the other end of the device is connected with a smoke discharge pipe section for smoke discharge; a SCR catalyst layer and a silencing material layer are arranged in the integral device; the SCR catalyst layer is positioned at one end in the device near the mixing pipe section; the silencing material layer is positioned at one end in the device near the smoke discharge pipe section; a flow homogenizer is arranged in an inlet of the mixing pipe section; and the mixing pipe section is also provided with an urea sprayer. The device is arrange