NOVELTY - A wall-clamped large constant-temperature methane trough having both ends that are 1/4 spheres, comprises a middle section that is a semi-circular cylinder connected with both ends; where the inner wall (5) and the outer wall (7) are of parallel circular arch structures; a hollow cavity (6) is formed between the inner wall and the outer wall; a trough plug (8) is arranged on the methane trough; a gas guide tube (9) is arranged on the trough plug; a material inlet (10) and a material outlet (11) are formed on a methane pool; and the material inlet is connected with a preheating chamber (14).    USE - The wall-clamped large constant-temperature methane trough is useful for industrial and commercial applications.    ADVANTAGE - The wall-clamped large constant-temperature methane trough has good temperature preserving property. Moreover, as the heating tube is connected with the warming boiler, the heat supplied by the heating energy keeps a working temperature of the methane trough at 30-35 degrees C; and the gas production rate is 1:1. Additionally, a 100 m3 methane trough can produce 80-100 m3 of methane every day to fully satisfy cooking, warming, lighting, and supplying warm water of 50 families and to keep the temperature of the methane trough constant.    DETAILED DESCRIPTION - A wall-clamped large constant-temperature methane trough having both ends that are 1/4 spheres, comprises a middle section that is a semi-circular cylinder connected with both ends; where the inner wall (5) and the outer wall (7) are of parallel circular arch structures; a hollow cavity (6) is formed between the inner wall and the outer wall; a trough plug (8) is arranged on the methane trough; a gas guide tube (9) is arranged on the trough plug; a material inlet (10) and a material outlet (11) are formed on a methane pool; the material inlet is connected with a preheating chamber (14); the material outlet is connected with a fertilizer making chamber (15); and auxiliary heat source systems are arranged at the bottom and on the inner wall of the methane trough.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the wall-clamped large constant-temperature methane trough.    Bearing layer (1)    Interlayer (2)    Heating layer (3)    Preheating chamber (14)    Fertilizer making chamber (15)