May I ask about the consumption ratio of coal with such properties for methanol production, as well as the gasification furnace technology to be used?

This post was last edited by CNCEC on 2015-11-11 at 16:35. The ash fusion point is very important in gasification technology; make sure to collect data on it. When using the Tsinghua furnace with this type of coal, the total energy consumption is approximately 45 GJ per ton, with the raw coal consuming about 36 GJ.

Thank you for your helpful advice, brother. After checking, the melting point of ash is 1300–1400 (it varies between the shallow and deep layers)

When slag is gasified, the ash melting point and grindability are important parameters!

If gas flow bed gasification is to be used, the ash melting point and the viscosity-temperature properties of the ash must be considered first. The ash melting point of your coal is not very high; it is necessary to conduct further analysis of its viscosity-temperature properties, by examining the viscosity-temperature curve of the ash residues. This is relevant to the operating temperature and the range of acceptable operating temperatures. Secondly, the grindability index must also be considered – whether the coal is easy to grind – as this affects consumption and the final carbon conversion rate. If slurry coal is taken into consideration, the slurry-forming capacity also needs to be considered. Since you mentioned good slurry-forming properties, then there’s no problem; it’s usually around 60%. For water-coal slurry, multi-nozzle systems can also be considered; they are widely used in China nowadays and the technology is quite mature. The advantage lies in their effective water treatment systems. Dry powder gasification, as well as cooling methods such as those used in space furnaces and Dongfang furnaces, can also be considered ； If high energy efficiency and co-generation of electricity are considered, Shell boilers or Huisheng boilers from Nanjing can be used; they operate on a waste-heat recovery system, resulting in high thermal efficiency. Based on the data you provided, it seems that the quality of your coal is quite good; it would be suitable for use as chemical industry coal.

For space furnaces, it is important to check whether the grindability of the coal and the viscosity range of the ash are suitable; a ash melting point between 1300–1400 is not a major issue. I don’t think bituminous coal is very suitable as a coal for gasification, as its volatile matter content is too low.

I’m very grateful for my brother’s advice. The company has only recently taken over this coal field, and in the coming time, technicians will need to be stationed there on a regular basis to conduct detailed tests of the coal’s properties, so as to fully understand them. Only in this way can the most suitable vaporizer be selected. These past two days, the leader has been considering candidates for a trip to Inner Mongolia; they are likely to stay there until the end of the year. We joked that spending the coldest times of the year in Inner Mongolia is a real test for one’s endurance... The Tsinghua furnace is just one option mentioned in our informal conversations; in reality, we’re not yet at a point where we need to make a final decision right now. Multiple nozzles are also one of the options we are considering. However, the dry powder gasification technology used in Shell’s furnaces is probably not a priority for us, as it seems more suitable for power generation; it doesn’t seem very appropriate for coal chemical processing, due to high investment costs, complex equipment, and other issues. Domestic space furnaces are one of the options we are considering. However, it initially seems that water-coal slurry might be more suitable... In any case, gasification technology is still under investigation at the moment; it’s necessary to first thoroughly understand the characteristics of the coal quality. Parameters such as ash fusion point and viscosity-temperature behavior will definitely need to be tested in detail in the coming period; once more accurate data are available, they will be shared here for feedback from brothers and other sailors

The ash fusion temperature data for 1300–1400 was obtained just yesterday by asking a technician casually, and it doesn’t seem very accurate. Over the next little over month, we will definitely conduct detailed tests on the coal samples; more accurate data will be available in some time. Once that happens, we’ll ask our colleagues for their guidance again. Thank you in advance

It has a calorific value of over 7,000 kcal, a moisture content of 0.7%, and low ash and sulfur levels. This type of coal is similar to washed bituminous coal, with lower moisture content; it forms under favorable conditions and undergoes high degrees of coalification. Highly coalified coal has low grindability, as well as low volatile matter and low reactivity, and strictly speaking is not suitable as coal for water-coal slurry gasification, as it cannot be used to produce high-concentration water-coal slurries. Therefore, to use the Tsinghua Furnace 2 generation, coal blending is the only option.