Ash deposition preventing arrangement structure for horizontal flue of coal-powder boiler

The invention provides an ash deposition preventing arrangement structure for a horizontal flue of a coal-powder boiler. The ash deposition preventing arrangement structure is reasonable in design and can enlarge the heating area, the heat transfer effect is improved, meanwhile, workers do not need to clear coal, labor intensity of the workers can be effectively reduced, and the production efficiency is improved. The ash deposition preventing arrangement structure comprises a combustion chamber, the horizontal flue, an overheater and a coal economizer. The horizontal flue is arranged above the combustion chamber. The overheater is located in the horizontal flue. The coal economizer is located on a vertical flue communicating with the horizontal flue. A water cooling wall is arranged below the horizontal flue. A certain slope is arranged on the front half portion below the horizontal flue. The ash deposition preventing arrangement structure is characterized in that the rear half portion of the bottom of the ho