Abstract: A pressure reducing system for fuel gas and a natural gas dewaxing vehicle are provided. The pressure reducing system includes fuel gas pipelines which consist of successively connected a high pressure pipeline, a medium pressure pipeline and a low pressure pipeline in the flow direction of fuel gas. The tail end of the low pressure pipeline connects with a combustion apparatus. A high pressure relief valve, a high pressure air feed valve, a heat exchanger and a primary pressure reducing valve subassembly are connected on the high pressure pipeline. The heat exchanger is provided with a hot fluid inlet and a hot fluid outlet, where the hot fluid inlet connects with a hot water apparatus, and the hot fluid outlet connects with a water storage apparatus. The medium pressure pipeline is equipped with a medium pressure relief valve and a secondary pressure reducing valve.

Abstract: A pressure reducing system for fuel gas and a natural gas dewaxing vehicle are disclosed. The pressure reducing system (6) comprises fuel gas pipelines which consist of successively connected a high pressure pipeline (41), a medium pressure pipeline (42) and a low pressure pipeline (43) in the flow direction of fuel gas. The tail end of the low pressure pipeline (43) connects with an combustion apparatus (7). A high pressure relief valve (17), a high pressure air feed valve (21), a heat exchanger (24) and a primary pressure reducing valve subassembly are connected on the high pressure pipeline (41). The heat exchanger (24) is provided with a hot fluid inlet (24A) and a hot fluid outlet (24B), wherein the hot fluid inlet (24A) connects with an hot water apparatus (12), and the hot fluid outlet (24B) connects with an water storage apparatus. The medium pressure pipeline (42) is equipped with a medium pressure relief valve (27) and a secondary pressure reducing valve (29).