PROBLEM TO BE SOLVED: To evaluate a bridge property of combustion ash in a heat transfer pipe of a boiler, in a combustion ash bridge property evaluation device.;SOLUTION: A combustion ash bridge property evaluation device 30 in a transfer pipe of a boiler includes: a heating furnace 32; a fuel supply part 34 for supplying mixture of a fuel and air from one end side of the heating furnace 32; and a probe pipe arrangement part 36 which is arranged on the other end side of the heating furnace 32, and in which a plurality of probe pipes 54 provided by extending in the direction orthogonal to a flow direction of a combustion gas for evaluation in which the mixture combusted are arranged. The Reynolds number of the combustion gas for evaluation, and an outer diameter and a pitch of the probe pipe 54 are set so that the Strouhal number of the flow of the combustion gas for evaluation with respect to the probe pipes 54 becomes the same Strouhal number of the flow of the combustion gas with respect to the heat transfer pipe of the boiler.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2019,JPO&INPIT
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