TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Device: The scraper mechanism is of complementary shape to the internal dimensions of the chamber. It is arranged to rotate within the chamber. It is arranged to be attached to a rotating component within the vessel. The auger arrangement comprises a shaft and the scraper mechanism is arranged to be attached to the shaft. It comprises a shaft and a flight arrangement mounted on the shaft, the scraper mechanism arranged to be attached to the flight arrangement. The scraper mechanism comprises a scraper member, the scraper member being of complementary shape to the internal dimensions of the chamber, and a support member, the scraper member being attached to the auger arrangement by the support member. It comprises a scraper member, the scraper member being of complementary shape to the internal dimensions of the chamber, and a support member, the scraper member being attached to the rotating component by the support member. The scraper member comprises a helical shaped member. It comprises a bar member. The support member comprises a scraper flight arrangement, where the scraper flight arrangement is arranged to act against the flow of matter from the inlet towards the outlet. The scraper mechanism is located in the vicinity of the outlet of the vessel. The vessel comprises a generally cylindrical body and a base cone at the lower end of the cylinder, the base cone comprising the outlet. Scraper mechanism is located in part within the cylindrical body and in part within the base cone. Inlet is higher than the outlet. The chamber defines a vertical axis, the inlet being mounted above the outlet on the vertical axis. The system is a pyrolysis system for pyrolyzing the input matter. The system further comprises a gas outlet arranged to extract gas produced by the pyrolysis reaction. It further comprises a heater to heat the chamber. Preferred Parameters: The matter to be pyrolyzed comprises particles having a maximum dimension of less than 50mm. The inlet has a diameter greater than 10mm. Preferred Composition: The material received at the inlet has a water content of less than 30%.