## 3 Methodology
### Discussion
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline
**Coal** & **Depature** & **Arrival** & **Transport** & **Type of** & **Transit** & **Transit** & **Storage** & **Cost** & **Volume of** & **Shipped** \\
**Batches** & **Time** & **Time** & **Routes** & **Transport** & **Node** & **Time** & **Time** & **Time** & **Feight** & **Shipped** \\ \hline
1 & 13:00 & 16:30 & 5-11 & Freeway & - & - & - & 251,544 & 3000 & Yes \\
2 & 10:00 & 15:15 & 11 & Railway & 5 & & - & 278,130 & 5000 & No \\
3 & 10:15 & 15:15 & 7-8-9-10-11 & Railway & - & - & - & 142,423 & 3000 & Yes \\  & 2 nd day, 7:00 & 2 nd day, 9:30 & 5-11 & Railway & - & - & - & 219,750 & 3000 & Yes \\  & 5 & 20:30 & 2 nd day, 5:45 & 3-4-9-10-11 & Railway & 10 & 19:15-23:30 & - & 256,730 & 5000 & Yes \\  & 6 & 20:45 & 2 nd day, 7:8-9-10-11 & Railway & 15 & & - & 286,890 & 5000 & No \\
7 & 12:15 & 17:00 & 5-6-12-14-13 & Railway & - & - & - & 260,553 & 3000 & Yes \\
8 & 9:30 & 17:00 & 3-7-8-9-10-12-14-13 & Railway & - & - & - & 189,395 & 3000 & Yes \\
9 & 10:15 & 17:00 & 7-8-9-10-12-14-13 & Railway & - & - & - & 184,531 & 3000 & No \\  & 14:00 & 2 nd day, & 5-6-12-14-15 & Railway & 15 & 23:00-2 nd day, & 3:00-2 nd day, & 280,487 & 3000 & Yes \\  & 10:00 & 13 & -6-12-14-13 & Highway & - & - & - & 9:15 & & \\
11 & 2 nd day, 7:30 & 2 nd day, & 3-7-8-9-10-12-14-13 & Railway & - & - & - & 317,336 & 5000 & No \\
12 & 2 nd day, 8:00 & 14:30 & 14:13 & Railway & - & - & - & 300,938 & 5000 & Yes \\
13 & 16:30 & 18:30 & 5-6 & Railway & - & - & - & 223,079 & 5000 & Yes \\
14 & 12:75 & 18:30 & 3-4-5-6 & Railway & - & - & - & 217,525 & 3000 & No \\
15 & 2 nd day, 9:45 & 2 nd day, & 5-6 & Railway & - & - & - & 234,745 & 3000 & Yes \\
16 & 2 nd day, 6:15 & 2 nd day, & 3-4-5-6 & Railway & - & - & - & 222,879 & 5000 & Yes \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Coal transfer plan. Figure 9: Demand is not refined to the hour of coal consumption land inventory. Compared with the optimization scheme of transfer, which is refined to the hour, although the desired arrival time window is set when designing the demand of a coal consumption place, the inventory fluctuation volume of the derived coal transfer scheme is much larger, and the inventory stockpiled at the coal consumption place occupies a large amount of capital, which is not in line with the production and operation objectives. Moreover, if the coal transport is carried out according to the daily demand interval of the coal-consuming place, the value of the demand interval transmitted by the coal-consuming place is very important; however, this value is often the empirical value of the coal-consuming place, and it would be more scientific to calculate the relationship between the coal transport volume and the stockpile volume according to objectively available data, such as the consumption rate that is refined to the hour, so that the relationship between the coal transport volume and the stockpile volume can be better coordinated between the upstream and downstream coal transport in the integrated production, transportation, and sales mode. Therefore, hourly coal consumption needs to be considered in the optimization process of the transfer scheme. Impact of price volatility in the coal market  
From the relevant data report of the CHN ENERGY Investment Group for the year 2021, it can be seen that the production of commodity coal was 307 million tons, the unit cost of production was CNY 155.5 per ton, the cost of purchased coal was CNY 48,742 million, the quantity of purchased coal was 126.3 million tons, and the unit cost of purchased coal was CNY 386 per ton. As the quality of coal required by the power generation segment and the coal chemical segment is different, and high-quality coal should be used for power generation, the selling price of the coal production department for the two segments is differentiated, these values being CNY 482 per ton and CNY 366 per ton, respectively, and the selling price to the outside world is CNY 599 per ton.