关键词: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">沸腾床, 渣油加氢裂化, 紧急泄压, 限流孔板, 启动联锁, 泄压速率

Abstract: The emergency pressure relief rate is crucial for the safe operation of high-pressure hydrogenation units during accident handling. The emergency pressure relief rate of the unit is related to the parameters such as the diameter of the emergency pressure relief system's orifice plate. This paper introduces a method for checking the diameter of the orifice plate in the emergency pressure relief system of an ebullated-bed residue hydrocracking unit. By theoretical calculation, it verifies whether the pressure relief rate of the unit meets the design requirements and further calculates the actual required orifice plate diameter, thereby significantly reducing the number of tests and shortening the startup and commissioning time. Taking an oil refinery's ebullated-bed residue hydrocracking unit as the research object, during the commissioning stage of the unit, the interlock conditions were activated under high-pressure hydrogen conditions, and the emergency pressure relief valve button was manually opened for emergency pressure relief testing. The diameter of the orifice plate was changed from 34.5 mm to 41.0 mm according to the calculation formula, and it was verified to meet the actual production requirements after testing.

Key words: font-family:-apple-system, blinkmacsystemfont, ", font-size:14px, background-color:#FFFFFF, ">ebullated-bed, residue hydrocracking, emergency pressure relief, restriction orifice plate, starting interlock, pressure relief rate