Process Design Of Safety Discharge System Of Petrochemical Plant

Along with consistent expanding markets of chemical materials and an ever-growing demand in synthetic rubber, the amount of newly-built and large-scaled chemical plants are on the rise. The synthetic rubber plant, for example, has several hazardous gas (including flammable and explosive ones like isobutylene and isoprene and highly toxic methyl chloride) to emit during the production process, which posed a hidden threat to safety production. Thus it matters a lot to design a set of safety relief system based on scientific rationality and perfect safety in an effort to ensure a smooth process operation.Safety relief system, applied in protecting pressure equipments like pressure vessels, boilers and pipeline system from explosion accident caused by overpressure due to fire, operation failure or the unexpected cutoff of water or electricity supply, plays a significant role in securing safety production of chemical enterprises.Exactly selection and setting of safety discharge system is a very important link of design works. Safety system including the safety valves, rupture discs and flare system for equipments and pipelines has been studied in this paper. In this study, the devices selection and setting mode were decided by operation conditions and material properties, the diameters of relief devices were optimized through calculation and simulation.This paper started by doing a HAZOP analysis with advanced technologies over each unit of a synthetic rubber plant, through which all possible defects triggered by design, operating or even management sections were spotted comprehensively. Consequences of all kinds resulted from equipment breakdowns and errors in operation were also analyzed and resolution corresponding to each case was verified as well. On the basis of data and information aforesaid and the calculation through the software of Pro/II, analyses of relief capacity of process materials in various conditions and design calculation over safety valves and rupture discs were finished in a bid to finalize local and overall relief capacity of dangerous materials under different operating conditions. Arrangement of flare system was finished and calculation on resistance of pipe network in all conditions was done in the end of this paper,thanks to the software of VISUAL FLOW. The extending direction of pipes and the size of header pipes were properly designed to achieve the aim of practicability, economy and aesthetics on the promise of meeting the requirements of safety design.The study in this paper reached the aim of achieving the maximum economic benefit by integrating safety production with lowering the cost of the plant.