A method for regulating coal quality in coal gasification process
A coal gasification and process technology, applied in the direction of external electrostatic separator, electrode structure, electrostatic separation, etc., can solve the problems of failing to meet the coal quality requirements of coal gasification process, increasing coal transportation cost, affecting coal gasification operation, etc. Low requirements for coal types, wide application range, and the effect of improving stability
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Embodiment 1
[0028] The present invention is further illustrated by examples. A coal with a relatively high ash content (42.34%) is selected. The main chemical components and content distribution are shown in Table 1. The separation goal is to make the obtained clean coal meet the coal quality requirements of the Shell coal gasification process with an ash content of 8%~30%.
[0029] Table 1 The main chemical composition and content distribution of raw coal
[0030] components clean coal Ash content quartz Kaolin pyrite Calcite Content % (raw coal) 57.66 42.34 21.32 8.33 5.39 3.86
[0031] The raw coal is ground into coal powder with a particle size of less than 74 μm in a coal mill and dried with hot air. Nitrogen is used to transport the coal powder to a tribo-charged electrostatic separator. The concentration of pulverized coal is selected as 25wt.%. The number of triboelectric electrostatic separation devices is selected as one. The form of the ...
Embodiment 2
[0037] Choose a coal with high sulfur content (7.62%), the main chemical composition and content distribution are shown in Table 3. The separation goal is to make the obtained clean coal meet the coal quality requirements of the Shell coal gasification process with a total sulfur content of less than 5.3%.
[0038] Table 3 The main chemical composition and content distribution of raw coal
[0039] components clean coal Ash content quartz Kaolin pyrite Calcite Total sulfur content Content % (raw coal) 65.61 34.39 16.03 6.51 9.52 2.33 7.62
[0040] The raw coal is ground into coal powder with a particle size of less than 74 μm in a coal mill and dried with hot air. Nitrogen is used to transport the coal powder to a tribo-charged electrostatic separator. The concentration of pulverized coal is selected as 30wt.%. The number of triboelectric electrostatic separation devices is selected as two. The friction charger of one of the friction ...
Embodiment 3
[0046] Choose a coal with low ash content (7.92%) and high sulfur content (5.44%). The main chemical components and content distribution are shown in Table 5. The goal is to adjust the coal quality through sorting and mixing of fly ash, cinder and raw coal, so that the obtained clean coal meets the coal quality requirements of coal gasification process with ash content of 8%~30% and total sulfur content of less than 5.3%.
[0047] Table 5 The main chemical composition and content distribution of raw coal
[0048] components clean coal Ash content quartz Kaolin pyrite Calcite Total sulfur content Content % (raw coal) 92.08 7.92 2.35 0.30 5.16 0.11 5.44
[0049] The fly ash and ash are transported to the coal mill and mixed with the raw coal through the belt according to the ratio of fly ash:ash:raw coal mass ratio of 0.1:0.1:1. The raw coal is ground into coal powder with a particle size of less than 74 μm in a coal mill and dried with h...
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