Hydrogen Safety Prediction and Analysis of Hydrogen Refueling Station Leakage Accidents and Process Using Multi-Relevance Machine Learning

Round 1

Reviewer 1 Report

The authors present a study on safety of hydrogen fueling stations. The work is generally interesting, but the manuscript requires a lot of improvement. The language is unclear/imprecise. As a consequence, the reader often does not what the authors want to say or things are simply expressed wrong. It is therefore hard to actually read the manuscript. The manuscript therefore requires a lot of improvement before it might be published. Some issues to be addressed are – among others:

1. The term „hydrogenation“ describes a chemical reaction in which an unsaturated molecule reacts with hydrogen. Using it for fueling a car with hydrogen is incorrect use of the term.
2. Hydrogen is not “a high-efficiency energy”. The wording itself does not make sense.
3. There is a difference between “safety” and “security”.
4. Line 46 to 47: “the selection… is very cautious”. I guess I know what you want to say, but it should be expressed in correct and meaningful English.
5. Line 47f: What have batteries to do with this topic?
6. What is the unit of specific gravity?
7. What kind of specific gravity is “13.44.0”?
8. What does this mean? (“The safety measure for the use of hydrogen energy is 0.0695.”)
9. Please specify what you mean with “1206,000 hydrogenation data”.
10. What does Figure 4 really tell us?
11. Were the data in the test set independent of the traning set or were they just different, but statistically depended data?
12. One could really make figures look a little more like in a scientific paper.
13. What do we really learn from the findings reported? The authors present some modelling results, but what conclusion can be drawn?

Author Response

1.Modified to hydrogen refueling station

2.This sentence has been deleted

3.There is a difference between “safety” and “security”. yes difference 

4.This sentence is modified to metal materials also needs to be very careful, which is also closely related to the safety of hydrogen in use, such as in hydrogen storage bottles, pipes, valves, instruments and pipe fittings are in use. 

5.Modified to the selection of metal materials also needs to be very careful,

6.air=1  When the specific gravity of air is 3.4~4.0(Air=1)

7.Modified to ”The specific gravity of hydrogen to air is only 0.0695.”

8.Modified to “Through the sensor collected 1,206 million hydrogenation data and analyzed, and calculated the fitting model.”

9.Modified to “Based on the above values, the data in the training set can be used to predict the possible periodic values of the various equipment in the hydrogen refueling station during the hydrogen refueling process, and to predict whether the current state or future state will be abnormal or dangerous based on the values It happened. As shown in Figure 4, only 20 forecast data in the future are shown here.”

10.The test set and the training set are data on different dates, and they are independent of each other

11.12.The core of the article is added in the last chapter:Through the above established model, the equipment real-time data input model is compared with the prediction results, and the equipment control strategy is obtained. Taking the temperature as an example, the operating temperature of the equipment can be predicted according to the model, and the control strategy can be specified to ensure that the equipment operates within a safe temperature range and ensure the safety of the equipment.

Author Response File: Author Response.docx

Reviewer 2 Report

Congratulations to authors by the research presented. It would be appropriate to introduce the changes presented in the attached file for the overall improvement of the text.

Comments for author File: Comments.pdf

Author Response

1.Modified to"C0 ₂"

2.Modified to 4.0v%. 

3.Reorder revised content

4.The format of mathematical formula has been modified to be unified

5.Because according to the above formula, calculate the tank volume, and according to the value of the tank volume, if the pressure is less than the nominal working pressure (NWP), the current hydrogen storage tank needs to be charged or the gas tank needs to be replaced.

6.Modified to 1.2 million 

7.Because used to roughly view the highest and stddev pressure values of the current device

8.Because the final purpose is to refuel the vehicle, it is necessary to analyze the hydrogen data when the vehicle is refueled, and based on these data, to reflect whether the current hydrogen refueling process needs to adjust the flow rate or air pressure. In order to reduce the risk in the hydrogenation process.(It has been explained in the corresponding position of the paper)

9.High pressure machine and medium pressure machine are written in the first section

10.Has been revised to：The horizontal axis is the start time, and its unit is seconds. 

11.“I believe that if there is an opportunity, these are improvements, and this system will become more and more perfect, more flexible and practical.” has been removed from the article

12. Has been revised to：1 means on, 2 means off

13.The core of the article is added in the last chapter:Through the above established model, the equipment real-time data input model is compared with the prediction results, and the equipment control strategy is obtained. Taking the temperature as an example, the operating temperature of the equipment can be predicted according to the model, and the control strategy can be specified to ensure that the equipment operates within a safe temperature range and ensure the safety of the equipment.

Round 2

Reviewer 1 Report

The manuscript has improved to some degree, but is still too weak for publication. Just some comments on the authors reply (there are still further issues that would need to be addressed):

1. If the reviewer points out that there is a difference between „safety“ and „security“ it is not sufficient to just reply „Yes, there is a difference“. Please correct the incorrect wording in the manuscript.
2. Regarding my last point #4: You might have reworded the sentence, but the new version still does not really make sense.
3. What is the unit of specific gravity? I guess it is not dimensionless (and if it is, please define it properly).
4. What is this supposed to mean: “When the specific gravity of air is 3.4~4.0(Air=1), the

specific gravity of gasoline vapor is 1, and hydrogen is only.” This does not make any sense.

5. Regarding my last point #8: You might have reworded the sentence, but the new version still does not really make sense.
6. The description of Figure 4 ist still barely understandable.
7. The language quality is still on an unacceptable low level. Please get the manuscript properly proofread.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

The new version took into account the comments and corrections mentioned above, which raised the quality of the article under review.

 

Author Response

First of all, thank you very much for your review. After carefully reading your reply to me, I carefully revised some existing problems in the paper and explained some problems.Because I was worried that my English grammar level was not enough, I used the editing service for the manuscript by MDPI.This is the first time I have written and contributed this type of paper. There are many deficiencies in the writing and grammar of the paper. I hope to learn from experience and learn to improve my ability through this submission.I sincerely hope you can forgive me for some of my problems and also hope my article will be published successfully.

Round 3

Reviewer 1 Report

I still see significant need for improvement in the manuscript and cannot recommend publication.