GASIFIER HARD START SEISMIC VERIFICATION SYSTEM
Publication Date: 2014-Nov-10
The IP.com Prior Art Database
This innovation will measure vibration, or seismic, pulses specific to the initial generation of syngas within a defined space. This release of energy occurs every time a gasifier is started up. The magnitude of this energy release at the point of startup is heavily influenced by two variables. One variable is the ratio of high purity oxygen and the carbon percentage present in the carbon-based feedstock. The other variable is the entry timing of each feed into the gasifier. Each of these variables can be adjusted from one startup to another, but the entry timing variable is more difficult to quantify. By measuring the magnitude of each vibration pulse, or seismic shock wave, that is created, it will then be possible to enhance the entry timing of each feed. Based on being able to reduce the vibration pulse specific to each startup will then ensure enhanced protection for all equipment involved, both internal and external to the gasifier.
The current innovation will provide means to measure and quantify, in a very timely manner, the quality of each startup from the distributed control system (DCS). Having this timely feedback is essential for each startup because the quality of each startup has the potential to cover a wide range of intensities at the moment that syngas is generated. The intensity of each startup can be defined as "smooth" or “hard”. A smooth startup may have a measured magnitude of the vibration be minimal, which may be because there are no noises (metallic, or hammering in nature) that can be detected from an external vantage point or physical movement of the internal and external pieces of equipment. A hard, or severe, startup may have a measured magnitude of the vibration be excessive that may be due to equipment, both internally and externally, being moved enough that it is physically damaged.
The present innovation will provide a valuable input variable that is not available at this time when it comes to any trouble-shooting efforts that follow hard starts. Currently, trouble-shooting efforts are initiated after a hard start that has produced at least one of the following external observations: a seismic shock wave that can be felt in the structure or beyond (along the ground); noises that are often metallic in nature (the internal metallic noises can range from a single loud clashing noise; or a continuous, softer or muffled hammering noise). If the movement happens to be external, then the degree or distance of the movement and the duration of that movement, as well as any forced contact with other objects can help determine the intensity of the vibration following the hard start, or other operational items that are measureable. As a result of the hard start, those measurements are higher, lower or erratic when compared to their previous measureable non-hard start states.
Without this innovation, corrective responses to a hard start may have the same delays and pitfalls. The delays and pitfalls may be due to not having a credible instrumented response that has begun and ended with the hard start, regardless of equipment failure. The inability to reach a timely and credible response to a hard start has historically been based on a collection of debatable circumstances that arise when using the current methods. These methods and/or observation techniques have included: the physical movement of equipment; internal and external noises; analytical data; and defining the physical characteristics of the selected equipment being used in the configuration before they are used. Therefore, without the current innovation and the measured values it will provide at startup, the historically-used DCS trends (level movement, delta-pressures, and pressure spikes) have lacked a level of credibility necessary to conclusively tie each trended variable available at this time to the visual observations that wer...