Rapid Hydrate Formation Conditions Prediction in Acid Gas Streams
, Eirini Maria Kanakaki 1, Sofianos Panagiotis Fotias 1 and Vassilis Gaganis 1,2,*Round 1
Reviewer 1 Report
Before accepting this article, the author must carefully consider the following questions and provide explanations in key areas of the article:
1.Even if the hydrate meets the phase equilibrium conditions, it will not be generated immediately, requiring a relatively high degree of subcooling, and there is still a period of induction time. The authors' idea of simply comparing the ambient temperature and pressure of the gas with the phase equilibrium conditions to determine whether hydrates are generated is not mature enough.
2.At present, the hydrate flow assurance has gradually shifted from a prevention and control strategy that completely prevents hydrate formation to a dynamic management of hydrate risk, which allows hydrate formation but prevents its aggregation and maintains the fluidity of hydrate slurry. Does the author simply equate the problem of hydrate generation with the risk of hydrate blockage.
3. The section 1 is too verbose, the lengthy content is not closely related to the research direction of the article, the literature research is not sufficient, and there is too little research on the phase equilibrium of acidic gases on hydrates.
4. The focus of this article is on acid gases, but the full text did not carefully analyze and deduce how acid gases affect the phase equilibrium of hydrates.
5.The method proposed in this article heavily relies on the training set of the data, but for the field, how to obtain the training set requires careful consideration by the authors.
Author Response
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Reviewer 2 Report
The document is well written and has a good structure. However, there are several aspects that should be addressed before publication:
1) Section 2.2. The text (lines 223-227) contradicts the meaning of equation (2).
2) Figure 6. For consistency, it is recommended that temperature and pressure be shown in the same dimension in the Figures. In the Figure 6, pressure is shown in kPa; in all other figures, pressure is given in bar.
3) Figures 8,10, 12, 14. The hydrate phase boundary (solid line) in the right panel of the indicated Figures has a characteristic bend to the right (marked by a red square), which does not correspond to the real phase behavior in the hydrate-forming system. At the upper quadruple point Q2, gas, aqueous solution, gas hydrate and liquid hydrate former are in equilibrium. At this point, there is a sharp increase in the slope of dp/dT, so the three-phase equilibrium gas – aqueous solution - hydrate changes to the three-phase equilibrium liquid hydrate former – aqueous solution – hydrate as the pressure and temperature increase after Q2. The phase envelope in the left panel is much closer to the real phase behavior.
Author Response
Please find attached our response to your comments.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
No suggestions
