Operation status of the fluidized bed gasifier
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Dear marine industry professionals: There are various types of gasifiers in our country, and fluidized bed gasifiers are currently the subject of much discussion. So, how are circular fluidized bed gasifiers performing in use by different companies? What are the problems existing in different furnace types and what are the improvement methods? I hope everyone can share their insights without reservation so that we can all learn from them? Personally, I think the market for fluidized bed gasifiers will also be very large in the future. Thank you!
I believe everyone’s choice is correct – the fluidized bed is by far the mainstream option. The fluidized bed technology is very complex and requires high energy consumption; wear and tear is one of the major challenges. Additionally, coal tends to coking, and dealing with the waste generated in medium-temperature gasification is quite difficult.
Gas-flow beds are definitely the mainstream technology at present, but their claim of being able to handle a wide range of coal types does not hold up to scrutiny. In China, coals with high ash content account for a large proportion, especially lignite with high ash levels. Currently, only fluidized-bed gasifiers are truly capable of processing such coals, and handling coals with high ash content is particularly challenging in the case of gas-flow beds. Moreover, as fluidized-bed technologies continue to improve, the issues related to waste generation are no longer a major problem; in fact, things are even simpler compared to steam-based gasification processes. Since dry slagging is used, there is only a small amount of wastewater from the subsequent syngas scrubber; the fly ash is burned back in the furnace, leaving only slag. Right or wrong, it’s just a personal opinion; therefore, I’d like to learn more about fluidized beds. I hope fellow sailors will not hesitate to share their knowledge and provide accurate answers.
At present, there are no particularly good gasification methods available for China’s high-calcium, high-sulfur, and high-ash coals, but from the perspective of gasification characteristics, fluidized bed is a suitable gasification technology. But low pressure and long-term operation are the current challenges.
What you say makes sense. I wonder what the maximum pressure in a fluidized bed is at the moment?
It’s the 10 kilograms from Yima Zongneng.
I heard that abroad, pressures as high as 4.0 MPa are used, right? Didn’t go up?
I’ve also heard that in the Endu furnace, after the bag filter, the original water washing method has been replaced by a cooler. So once the gas is cooled, won’t the fly ash contained in it settle on the cooler? Will it have no impact on the subsequent system? How exactly is it done? Expert, where are you! ! ! Thank you so much
It is important to note here whether gasification is used to produce fuel gas or feed gas. For fuel gas, cost is the main factor to consider ； The value-added of the feed gas is relatively high, so although the cost is a bit higher, it’s not a major issue. When comprehensively evaluating gasification technology, from the current requirements, environmental protection is a key factor, followed by efficiency, cost, and so on. Therefore, gas flow beds or fluidized beds need to be considered in terms of their applications.
First of all, thank you for your reply; it is precisely because of this that we need to have a discussion. I work in the field of fluidized beds, so my goal is to learn more about fluidized-bed gasifiers
First of all, thank you for your reply; it is precisely because of this that we need to have a discussion. I work in the field of fluidized beds, so my goal is to learn more about fluidized-bed gasifiers