Abstract: Coal combined sample equipment has been widely used in coal,coal-fired power plants and other fields, and its performance deviation may lead to coal trade disputes, which affect the safety and economy of boiler combustion. The paper describes the inspection of combined coal preparation equipment with performance deviation, and iuugrates the process of static and dynamic examination of equipment inspection. By adjusting the equipment, the defects of key parts of the equipment were eliminated, particle size and the reduction ratio of technical parameters were redfined. According to the performance test of relevant technical standards, the equipment performance was evaluated through auuracy, system bias and supplemental tests. The equipment meets the requirements of relevant standards.

Key words: coal, combined sample preparation equipment, performance adjustment, test