Internationally, 380# heavy oil refers to fuel oil with kinematic viscosity (50℃) greater than 180cSt but less than 380cSt. 4380# heavy oil requires (1) kinematic viscosity (50℃), which has little influence on the company's diesel engine, mainly due to heating problems. According to the heating situation, it is generally controlled within 380cSt, when it is cold. To ensure good liquidity. (2) Density (15℃) Due to the technical requirements of the oil separator, the density must be controlled within 0.991g/cm3 (international standard), otherwise abnormal operation will occur during oil separation, and water and impurities will not be discharged normally. If conditions permit, it is better to be within 0985g/cm3 and exceed 0985g/cm3. The lower the net calorific value, the higher the water consumption. The current international standard requires that the water content is less than or equal to 0.5%, and the unit price will be deducted if it exceeds 0.5%. Due to the limitation of the water sensor of the oil separator, the maximum water content cannot exceed 65,438+00%, otherwise the oil separator will be exhausted. (4) Pour point Pour point is the main parameter reflecting the low-temperature fluidity of heavy oil, which is mainly affected by the composition of wax in heavy oil. The higher the wax content, the higher the pour point. It can be relaxed to ≤20℃ in summer, and the international standard is ≤30℃. If the power plant heats enough steam, it can be relaxed to international standards. This strict requirement is to prevent personal underheating. If the pipeline is blocked by heavy oil due to insufficient heating, the normal operation of power generation will be affected. (5) Sulfur content is mainly related to corrosion and environmental protection. Of course, the lower the better, according to the requirements of the unit, within 35%. It is best to control it at ≤ 10%. (6) Flash point is an index related to fuel safety, and international standards require the closed flash point of heavy oil to be ≥60℃. Please note that the open flash point cannot replace the closed flash point because the open flash point is higher than the closed flash point. Usually, the closed flash point of heavy oil is above 120℃, but the closed flash point of heavy oil doped with C9 is only 37℃, which seriously affects safety.