With so much attention on adding carbon capture to existing coal plants, TRAX has seen an increase in requests for draft studies for carbon capture additions. There are several benefits of modeling these changes due to the unique concerns that result from the addition of carbon capture and storage (CCS) capabilities.
In a TRAX draft study, engineers use our ProTRAX simulation software system to develop high-performance, high-fidelity models. These models are used to predict the behavior of the unit in its future configuration and determine the furnace and duct pressure profiles during normal and abnormal transient operations. When unacceptable pressures are encountered, TRAX recommends process modifications and/or control system changes to alleviate these potentially dangerous pressures. TRAX then tests these mitigations with the high-fidelity models.
The specific concerns for any given site or unit will vary based on configuration, fuel capabilities, fan draft, etc., but TRAX has seen several common issues when modeling the addition of carbon capture equipment.
TRAX’s modeling software includes fully developed modules to replicate CCS processes
Recognizing these CCS concerns, a model can be beneficial in allowing a client to test different plant configurations and controls schemes. TRAX ultra-high-fidelity models are best suited for fast events such as those in the air-flue gas path. Clients can optimize their configuration for best results, ensure the controls can handle various scenarios, prevent damage to existing equipment, and operate with fewest nuisance trips. The advantages to modeling a major addition come in four main varieties.
Safety. The CCS additions that TRAX has modeled have significant changes to the unit draft flow. With a study, clients can determine where ductwork and equipment pressures approach design limits and protect the furnace from extreme pressure events.The CCS additions that TRAX has modeled have significant changes to the unit draft flow. With a study, clients can determine where ductwork and equipment pressures approach design limits and protect the furnace from extreme pressure events.The CCS additions that TRAX has modeled have significant changes to the unit draft flow. With a study, clients can determine where ductwork and equipment pressures approach design limits and protect the furnace from extreme pressure events.
Cost Effectiveness. TRAX extensively tests controls strategies to optimize safe operation with a minimum of nuisance trips. In many cases, controls modifications successfully mitigate pressure excursions in order to avoid strengthening ducting runs or even the boiler.
Controls Checkout. TRAX can test scenarios to ensure that fan and other trips are avoided when possible. In units connected by the carbon capture equipment, our model analysis can suggest strategies for limiting the disturbance caused by an event in one unit to prevent propagation to another unit. In addition, we ensure all suggested mitigation strategies are in compliance with NFPA 85 fire prevention code.
Process Reliability. An analysis of new equipment can discover issues such as fan sizing problems, ducting issues, and concerns with damper speeds. Through modeling, TRAX can help find these issues before purchase.
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