The problem of quenching two streams of furnace gas
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I’ve been looking at some information on two-stage furnaces recently, and it’s a bit confusing. I’d like to ask whether in the quenching process for two-stage dry coal powder gas production, the gas goes directly into a cooling tank for cooling after the second stage of gasification? Should water be sprayed from the top of the furnace to achieve rapid cooling first? Or is a cold gas circulation quenching system required, like in Shell furnaces? If the method of sending the gas directly from the gasification furnace to the cooling tank is used, the temperature of the raw syngas at the outlet of the gasification furnace should still be above 1000 degrees. How can heat recovery be ensured in this case, while also ensuring that the temperature of the gas drops to the appropriate level before it reaches the conversion unit?
Which expert knows this? Please help me figure it out!
Excessively high gas temperature in the quench section can also cause the downstream S1501 to break due to the high viscosity of the ash generated by the high temperature, which leads to adhesion issues.
First, quench with water, then perform secondary cooling in a cooling tank!
So what is its waste heat recovery efficiency? Using water isn’t very efficient, is it?
The waste heat recovery efficiency is naturally low, as it is no longer a waste boiler process; instead, the syngas is directly cooled using water. The syngas becomes saturated with steam, which facilitates the subsequent shift reaction. The cooling process developed by TPRI has already been applied in the Shilin project in Inner Mongolia. This cooling process is well-suited for chemical production, as it requires less investment, has a simple design, and operates reliably. The waste boiler process, on the other hand, can recover the heat from the syngas to generate steam for power generation, making it suitable for IGCC power generation. The IGCC technology used in Tianjin relies on the two-stage waste boiler process with dry coal powder pressurized fluidized bed gasification technology developed by Xi’an Thermal Power Research Institute (now part of Huaneng Group’s Clean Energy Research Institute). My QQ is 275538341. Brother, what’s your QQ? Let’s communicate more if there are any issues.