Hybrid sequential and simultaneous process simulation system

Abstract

A pressure and flow calculation technique that efficiently solves for pressures and flows within a process network uses both a simultaneous and a sequential solving method. The calculation technique first determines a flow conductance for each of the process network elements, linearizes pressure and flow relationships in each flow path by determining a linearized flow conductance for each process element and then determines a composite process network having a linearized, composite process component in each flow path to produce a simplified process network. A simultaneous solving method is then used to simultaneously solve for the pressures and flows at each of a set of junction nodes of the simplified process network and thereafter a sequential solving method is applied to determine the pressures and flows at the other nodes of the process network.

Description

technical field [0001] The present invention relates generally to the operation of simulating flow networks, such as those used in power plants, industrial manufacturing plants, process plants, and other types of process plants, and more particularly to methods for efficiently solving process network simulation systems Systems and methods for real-time pressure / flow parameters in . Background technique [0002] Distributed process control systems, such as those typically used in power generation, chemical manufacturing, petroleum processing, industrial manufacturing, or other types of plants, typically include one or more analog / digital or combined analog / A digital or wireless bus is communicatively coupled to the controllers of the plurality of field devices. Field devices may be, for example, valves, valve positioners, switches, transmitters (e.g., temperature, pressure, level, and flow rate sensors), furnaces, heat exchangers, furnaces, etc., located in a plant environm...

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Problems solved by technology

However, this technique has the disadvantage that it takes a long time and / or a lot of processing power to find a solution during each time interval or simulation loop.

Another disadvantage of this approach is that the entire equation structure is pre-constructed or pre-established, and the centralized solver may therefore have difficulty dealing with matrix singularities that may arise in specific cases

Because all simulated process components are connected together in a network, the time required to complete the entire set of computations can be challenging, especially when the network size is large, at least in part because of the Slow propagation of pressure and flow calculations between different simulation modules

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