NOVELTY - A coal preparing method involves sorting out large combustible material and other materials. Household rubbish with an opening of a plastic bag is broken down. Ferrous metal separation of the materials is carried out. Harmless inorganic filling material is sieved and crushed for producing regenerated coal. Organic matter is degraded. Base material is squeezed and dehydrated. The base material is drum type dried and crushed with other combustible material. Certain proportion of acid and calcium oxide are added to the base material to produce pulverized coal. The coal is dried and purified.    USE - Method for preparing coal from urban domestic rubbish.    ADVANTAGE - The method enables processing urban domestic rubbish in simple manner and preparing coal, which has high heat value, no secondary pollution and stable combustion. The method enables realizing resource recycling, replacing fossil fuel, saving lot of nation resources and changing waste into valuable materials in small floor area and short processing period with low operation cost.    DETAILED DESCRIPTION - A coal preparing method involves sorting out large combustible material and other materials. Household rubbish with an opening of a plastic bag is broken down and bag material is dispersed for convenient subsequent processing. Ferrous metal separation of the materials is carried out. Harmless inorganic filling material is sieved and crushed for producing regenerated coal. Organic matter is degraded by steam under pressure of 1.1 MPa at 180 degrees C for 1 hour to release water from the organic matter and to improve heat value of regenerated coal base material. The base material is squeezed and dehydrated by a dehydrating machine to reduce water content of the base material and to save energy greater than 30 percent. The base material is drum type dried. The dried product and other combustible material are crushed together as the base material of the regenerated coal. Proportion of acid and calcium oxide is added to the base material to produce pulverized coal, which is suitable for transporting and burning irrespective of client and market demand. The regenerated coal is dried and purified.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart illustrating a method for preparing coal from urban domestic rubbish.