Discussion on coal quality issues in coal mines

1. During project construction, more silos should be built; when coal is unloaded, it can be done simultaneously from several silos, and the concept of coal blending can be utilized to mitigate fluctuations in the quality of coal from coal mines； 2. It is said that there is now online coal quality analysis available, which allows for the online analysis of the ash composition in order to estimate the ash fusion point, serving as a reference for gasification units ； 3. If nothing else works, the frequency of coal analysis must be increased, and the staff in the gasification unit should pay more attention to the process parameters.

This post was last edited by shuker666 on 2019-12-17 17:03: https://bbs.hcbbs.com/thread-2762542-1-1.html ； https://bbs.hcbbs.com/thread-727683-1-1.html This is my previous discussion on coal quality analysis. Coal quality data is fundamental; only by understanding the basics of coal can appropriate measures be taken based on specific requirements

This post was last edited by shuker666 on 2019-12-17 at 17:46. Generally speaking, for gasification technology, key technical parameters such as ash fusion point, viscosity-temperature characteristics, ash content, and slurry-forming ability are very important； For sulfur recovery in subsequent processes, the main issue is the fluctuations in sulfur content ； The remaining individual parameters can be achieved through technical selection and design. The regulation of ash content (especially its reduction) is primarily achieved through coal washing. For large coal mines, **regulations require the presence of coal washing plants, which essentially solves this problem; it also addresses the issue of high sulfur content ； Pulp-forming regulation: measures such as adding additives, grading, and coal blending ； Visco-temperature properties and ash fusion point adjustment: measures such as adding cosolvents and coal blending ； Therefore, there are corresponding countermeasures for all indicative issues. However, for the raw coal produced in bulk by coal mines, the significant fluctuations in coal quality caused by complex factors such as differences in coal seams and coal-forming conditions inevitably lead to difficulties in production. So, in my opinion, laying a solid foundation remains key. The general approach is that during the project approval phase, the appropriate gasification technology should be selected based on the coal quality data of the coal mine; during the design phase, design deviations should be minimized and sufficient design margins taken into account (that is, the choice of coal type should be carefully considered). Once the project is operational, an appropriate coal source should be matched to the gasification technology, which helps to ensure stable production. To strengthen the data foundation, it is necessary to have a clear understanding of the coal quality data related to coal mines. Coal mines undergo underground drilling surveys during the initial exploration, detailed exploration, and refined exploration phases; these original drill core sample data serve as the basis. By conducting statistical analysis on these coal core sample data, and using statistical modeling in accordance with the design and mining plans for coal mine construction, it is possible to analyze the coal quality. In simple terms, this involves determining the coal quality characteristics of the coal seams mined over a certain time period. By having a clear grasp of the overall trends, minor adjustments can be made through appropriate measures to improve and supplement the information, thereby preventing deviations from the intended course. On this basis, individual issues should be addressed separately, that is, by taking into account actual production management, technical methods, operational techniques, production experience, and so on, in order to achieve stable coal quality and consistent production. The actual implementation process is much more detailed than this, with many factors to take into account; I can only discuss it briefly here, so I welcome any advice.

Adopting advanced coal blending technology is a reliable approach; given China’s vast territory, there are significant differences in coal quality

There are mature technical methods for coal quality testing, but they are all in the hands of imported brands; the equipment is just more expensive