Method and device for preparing activated carbon by treating distillers' grains of white spirit with supercritical or subcritical water

The invention discloses a method and device for preparing activated carbon by treating distillers' grains of white spirit with supercritical or subcritical water. A 10 to 15 g of distillers' grain rawmaterial sieved by a 100-mesh sieve (150 mum) and weighed is placed in a reactor, and deionized water is filled into a water storage tank; after installation of an experimental device is completed, ahigh-pressure pump is opened; the deionized water is input into a reaction device; a needle valve is closed after water flows out of a water outlet of the device; a back pressure valve is opened to boost to carry out leakage checking, and operation is kept for 20 to 30 min; a pressure is relieved after leakage checking is completed; condensate water is opened, warming is started, and a constant temperature is kept after a set temperature is reached; then boosting is carried out to form water in a supercritical or subcritical state to react with the distillers' grains; after a reaction is completed, the pressure is rel