DS/ISO 9931-1992 煤．直接燃煤系统气体传送的雾化煤的取样引用关系

适用范围: This International Standard specifies a method which, subject to limitations imposed by the geometry of the pulverized-coal pipe, is applicable to multipoint sampling of pulverized coal suspended in air or other gases conveyed in circular pipes between pulverizer and burners in direct fired coal systems in power stations. The samples collected are used for deriving the mass distribution of coal between the burners and the particle size distribution of the coal, with the object of determining the performance of a pulverizer. The method is suitable for sampling from vertical circular pipes at, or beyond, a specified distance from a flow disturbance when — the maximum particle size to be sampled is less than one-third of the diameter of the sampler tip aperture, i.e. less than 1,5 mm (to ensure representative sampling and to avoid clogging of the sampler); — sampling takes place in a circular pipe with an internal diameter between 250 mm and 700 mm; — the air/coal ratio in the pipe is within the normal range of direct fired pulverized coal systems. NOTE 2 If sampling access can only be made at an unsuitable position, depending upon the purpose of the measurement, the equipment may still give satisfactory results. In such positions a more detailed investigation may be necessary. This may involve taking individual samples covering the full cross-section of the pipe using some other method, including a single tip sampler.

DS/ISO 9931-1992
煤．直接燃煤系统气体传送的雾化煤的取样