We are promoting microwave drying technology for lignite. Commercialized technologies in the United States

Are there any relevant parameters? Let me introduce the scale and energy consumption

1. Dewatering efficiency: more than 90% higher than that of similar domestic products. 2. For methanol plants, the cost can be recovered within 2.6 years. 3. For lignite or coals-based plants, the cost can be recovered within 1.04 years. 4. The microwave dewatering technology for lignite utilizes high-power microwave generators to apply steady and rapid microwave heating to coal transported on belts, thereby removing the external and internal water present in the coal. Great Wall Energy Chemicals has approved this technology. This technology has significant advantages over conventional heating and dehydration: first, since microwave heating operates on a non-contact principle, it prevents damage to coal during drying using current methods, thereby reducing coal loss rates ； Second, microwave heating has very good selectivity. The temperature used for water removal by microwaves is low, with a maximum temperature of only 85°C; this temperature does not cause any reactions in the other components of coal, while the water evaporates in the form of steam ； Thirdly, microwave water removal offers excellent controllability; it enables precise control of the moisture content in coal, allowing the external moisture level to be reduced from 20% to 1% and the internal moisture level to be reduced by 3%, thereby lowering operating costs

Can this technology be used to achieve the pyrolysis of coal powder?

Could you give us a detailed introduction to the workflow? Let’s briefly introduce the processing steps and the cost per ton of coal. How much investment is needed, and what is the land area required? Can lignite with a moisture content of 32%-45% be processed?

We have economic analysis and return on investment calculations; the specific details depend on the actual conditions of the coal. It’s similar to what Nanjing Sanle uses, but the dehydration rate is 90% higher. Typically, the moisture content of lignite in coal washing plants before it reaches the processing unit is 20%. If you want to remove all the water, it’s recommended to use flue gas for preliminary dehydration first, and then carry out further strict dehydration

This technology is designed to prevent thermal pyrolysis from occurring

What is the energy conversion efficiency of this technology? What is the conversion rate of electrical energy into the energy required for drying? What is the efficiency of converting electrical energy into microwave energy?

The MRE technology, right? We did it in 2008; to be honest, using microwaves to improve the quality of low-quality coal isn’t worth it at all – the costs are too high

I have been studying coal drying, taking into account environmental and investment costs, and I’m not sure whether this drying method incurs higher costs compared to hot air ovens or steam rotary dryers

This post was last edited by douglas on 2015-7-10 14:29. The economic return rate is high; 1) the total carbon content of lignite ensures this, 2) there is minimal loss of volatile substances； 3 The integrity of lignite is ensured, and it is better than hot air (or hot steam drying) in terms of benefits, economics, and the environment. On-site in the United States, both hot steam drying and microwave drying are used, but in terms of working conditions, microwave drying is better