Factors affecting the gasification pressure of dry coal entrained flow bed
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:victory: Both SHELL and GSP are dry coal pulverized entrained bed gasification technologies. According to some data, the maximum gasification pressure of SHELL is 4.0MPa and the maximum gasification pressure of GSP is 8.0MPa. Teachers, is there any basis for this statement? Welcome to discuss the factors that may affect the gasification pressure of dry coal entrained bed. This post was last edited by Pioneer on 2007-12-31 21:23 ]
As for the air flow bed, the factors affecting the gasification pressure of dry coal may be mainly due to the limitation of the transportation speed of dry coal at the current technical level. If the speed is too high, it may cause combustion or explosion due to friction during transportation. From this point of view, neither SHELL nor GSP can make the gasification pressure too high, and the maximum should be ~4.0MPa.
The feeding method is one of the limiting factors that prevents the dry gasification pressure from being too high. 1. The current powder velocity measurement technology cannot yet achieve stable measurement under pressure exceeding 6.5Mpa (in practice), but it can be solved soon. The actual speed of conveying dry coal powder should not be a problem 2. Energy consumption of feeding materials after the pressure is increased * * Increase. Because the energy consumption of powder transportation is much higher than that of coal slurry transportation. 3. Equipment investment has increased significantly. The last two are the main reasons, regardless of Shell or GSP.
I agree with the 3rd floor. The important reason why the gasification pressure of dry powder is relatively low (currently below 4MPa) is because its transportation method consumes high energy and is difficult to measure. Because dry powder transportation uses a lock bucket system, it requires repeated pressure filling and pressure relief. As we all know, the gas pressure filling process is relatively slow, and gas compression consumes a lot of energy (much higher than liquid pressurization). Moreover, this part of the gas needs to be depressurized. The depressurization process is also very long, and the decompression gas will contain powder. If the speed is too fast, it will also cause wear of pipeline valves.
In the case of increased energy consumption, it would also be very good if the solid-gas ratio can increase year-on-year.
I heard from GSP that their gasification pressure can reach 42 kg. But other dry coal pulverized gasification is not enough!
Aerospace signed a set of 6.5MPa gasifiers. I don’t know how they achieved it.