关键词: 炼化装置, 爆炸危险区域, 附加2区, 热油单元, ⅢB类液体, 闪点, 最高允许表面温度, 粉尘厚度

Abstract:

In this paper, several bottleneck problems are put forward about hazardous area classification and the selection and design of electrical apparatus explosion-proof in refining and chemical plants. Comparing different regulations between domestic and international system standards, it is put forward that the general provisions of relevant contents in the national standard and the problems of how to implement them in engineering design and equipment selection. Compared with the provisions of relevant contents in North American standards, based on the clear definition of the value of equipment process parameters, this paper analyzes the theoretical compatibility of these provisions. Investigate the practice and actual operation of domestic plants that have been in operation for many years, it is concluded that the design can refer to the provisions of API or NFPA series standards to determine whether to divide the hazardous area, the scope of hazardous area and the selection of explosion-proof equipment, which can be used to guide the actual engineering design.

Key words: refining and chemical plant, explosion hazardous area, additional zone 2, hot oil unit, Class ⅢB liquid, flash point, the highest permissible surface temperature, dust thickness