Shell & Tube 열교환기 Tube Rupture Case에 대한 동적 해석

Abstract

The importance of safety in modern industry is becoming more important. To ensure safe operation of the plant it need to be accessed in many ways - select more reliable and safer process, design control systems to operate safely, and prepare the pressure relieving and flaring system to prevent the plant explosion. Tube rupture from the heat transfer equipment failure is a unique relieving case which requires the design of safe pressure relieving and flaring system under API 521 scenarios. And API 521 describes that the overpressure can be very serious and damage the heat exchanger and its system, especially in case that the shell side fluid is low pressure liquid and tube side fluid is high pressure gas (or flashing liquid). Regarding this matter, API 521 recommends to perform a dynamic simulation to check the pressure transient and equip adequate relieving devices according to the simulation results. The simulation of this tube rupture case has been performed by few engineering companies, and the problem is that there is no method using commercial programs to execute the dynamic simulation. In this paper, the heat exchanger system for tube rupture case is modeled by OLGA program. Two shell and tube heat exchangers are selected for the dynamic simulation modeling and each size of PSVs listed in API 526 are applied to the simulation. As the result of the simulation, the pressure transients due to the tube rupture are verified and the appropriate size of PSV is selected to remove the overpressure.