Steam generation apparatus and associated control system and methods for providing desired steam quality
AssigneeSkavis Corporation
InventorsRandall J. Davis, Charles F. Noll, Jr.
Life of this patent
Estimating the term…
Abstract
The current disclosure relates to steam generation and supply apparati and associated control systems. Particularly, the current disclosure relates to such steam generation supply apparati and associated control systems that are used for enhanced oil recovery. Certain embodiments are provided including methods and associated control systems related to the startup as well as main steam pressure header control or maintenance of a desired steam quality for such steam generation systems during normal operation.
Claims31
An apparatus for supplying at least one of water and steam to a desired destination at a desired steam quality comprising:
- a feedwater system;
- a steam generation system;
- a delivery system that includes a main steam header pipe that runs from the steam generation system to the desired destination for supplying steam or water;
- a plurality of instruments and devices that are in operative association with the feedwater system, steam generating system, or delivery system configured for sensing physical parameters of water or steam;
- and
- a control system having an input device, output device and memory, said control system being in operative association or communication with said instruments and devices wherein said control system is configured for performing an operation of determining a feedwater enthalpyl;
- wherein said control system is configured for determining an amount of heat needed to be put into feedwater to make at least one of water and steam have the desired steam quality by subtracting the feedwater enthalpy from an estimated desired steam quality enthalpy.
An apparatus for supplying at least one of water and steam to a desired destination at a desired steam quality comprising:
- a feedwater system;
- a steam generation system comprising a burner, a boiler and a flue;
- a delivery system comprising:
- a main steam header pipe that runs from the steam generation system to the desired destination for supplying steam or water,
- a pressure sensing instrument that is located downstream from the steam generating system for measuring the pressure of the steam or water,
- an oxygen sensor that is in communication or operative association with the flue for measuring an oxygen content of a flue gas, and
- a thermocouple that is in communication or operative association with the boiler for measuring a stack temperature;
- a plurality of instruments and devices that are in operative association with the feedwater system, steam generating system, or delivery system configured for sensing physical parameters of water or steam;
- and
- a control system having an input device, output device and memory, the control system being in operative association or communication with the instruments and devices wherein the control system is configured for performing an operation of determining a feedwater enthalpy.
An apparatus for supplying at least one of water and steam to a desired destination at a desired steam quality comprising:
- a feedwater system;
- a steam generation system;
- a delivery system comprising a main steam header pipe that runs from the steam generation system to the desired destination for supplying steam or water;
- a plurality of instruments and devices that are in operative association with the feedwater system, steam generating system, or delivery system configured for sensing physical parameters of water or steam;
- and
- a control system having an input device, output device and memory, the control system being in operative association or communication with the instruments and devices, the memory comprising an enthalpy table stored therein, the control system configured to perform an operation of determining a feedwater enthalpy by estimating an enthalpy of the steam or water having a desired quality by looking up enthalpy values of vapor and liquid portions of a current output of the steam generating system, and
- calculating the estimated enthalpy by subtracting a current enthalpy of the liquid portion of the current output from a current enthalpy of the vapor portion of the current output and multiplying that difference by the desired steam quality in fraction form and then adding the current enthalpy of the liquid portion of the steam.
Dependencies are inferred from the claim text.