Modelling and Simulation of the Freezing Systems and Heat Pumps Using Unisim ® Design C
Abstract—The paper describes the modeling and simulation of the heat pumps domain processes. The main objective of the study is the use of the heat pump in propene–propane distillation processes. The modeling and simulation instrument is the Unisim® Design simulator. The paper is structured in three parts: An overview of the compressing gases, the modeling and simulation of the freezing systems, and the modeling and simulation of the heat pumps. For each of these systems, there are presented the Unisim® Design simulation diagrams, the input–output system structure and the numerical results. Future studies will consider modeling and simulation of the propene–propane distillation process with heat pump.
Simulation of Gas Dehydration Plants Safe Operation in Chemical Industry
This article describes a study of the dynamic behavior of a gas dehydration plant that uses triethylene glycol as sorbent agent. The gas dehydration technology in these plants benefits from the high capacity of triethylene – glycol to absorb water from gas. After desorption the hygroscopic qualities of the agent return to the initial state of unsaturation. The authors used the software package HYSYS v3.2® to simulate this process. The main cases refer only to the process safety in operation and the various situations that may occur during this process.
Design concept for implementation of a novel subsea gas dehydration process for a gas/condensate well
Abstract Natural Gas usually contains significant quantities of water vapour, which must be removed for gas processing and transmission. Common allowable water content of transmission gas ranges from 4 to 7 pounds per MMSCF (64–112 mg/m3). Failure to sufficiently reduce the water content can lead to condensation of liquid water and the formation and accumulation of gas hydrates into pipe blocking plugs. This is particularly important for subsea pipelines with the high pressure and low temperatures conditions that exposes the gas to hydrate formation conditions. To meet the demands of deeper and more remote reservoirs, subsea processing has been poised as one of the most potentially promising technology developments in the offshore development. A novel dehydration solution that is applicable for subsea installation has been designed and tested in the laboratories of Clean Gas Technology Australia department of Curtin University. The solution utilises the concepts of gas cooling through expansion and the controlled formation and management of gas hydrates to reduce the water content of a saturated gas stream to levels suitable for gas transport in subsea pipelines. The pilot plant implemented to test the solution design at pressures up to 10 MPa (1469 psi) and flow rates of 35 std m3/h (30 MSCFD) demonstrated that dehydration performance better than achieved with batch experiments was achievable. This paper describes a design methodology to migrate the process to a subsea implementation and presents a model for a production implementation using the experimentally obtained dehydration performance, demonstrating that it can provide a viable subsea dehydration solution.