Effects of carbonization temperature on the products from integrated mild-liquefaction and carbonization process of Hongliulin coal
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摘要: 在炭化温度为430-600 ℃研究了红柳林煤温和液化-炭化耦合转化过程的产物分布及理化性质。结果表明，半焦产率达40.64%-53.02%，有机液相产率达30.89%-36.98%，正己烷可溶物产率达29.74%-33.28%；在较低温度下炭化温度升高有利于正己烷可溶物产率提高，而在较高炭化温度下则相反；430 ℃炭化温度下半焦表现出较强黏结性，550 ℃炭化温度下半焦的黏结性消失，挥发分降至10%左右。通过调节炭化温度可使半焦定向用于配煤炼焦或无烟煤原料。Abstract: The integrated mild-liquefaction and carbonization experiments of Hongliulin coal were conducted at 430-600 ℃, and distributions and physico-chemical properties of the obtained products were investigated. The results show that the yields of semi-cokes, organic liquid products and n-hexane soluble organic products were up to 40.64%-53.02%, 30.89%-36.98% and 29.74%-33.28%, respectively. The increasing carbonization temperature in the relatively low temperature range was favorable for the elevated yield of n-hexane soluble organic products, while at relatively high temperature presenting an opposite one. The semi-cokes obtained at 430 ℃ presented a strong caking property, while those at 550 ℃ showed no caking property, and the content of their volatile matters decreased to about 10%. It is suggested that the produced semi-coke could be directionally utilized as blending coal in coking or smokeless fuel by adjusting carbonization temperature.
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Key words:
- coal /
- mild-liquefaction /
- carbonization /
- semi-coke /
- liquid phase products
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图 1 自建的炭化装置示意图
Figure 1 Schematic diagram of self-built carbonization set-up
1: nitrogen cylinder; 2: mass flowmeter; 3: thermocouple; 4: heating furnace; 5: salt bath; 6: carbonization reactor; 7: cold trap; 8: gas washing bottle; 9: acetone; 10: ice-water bath; 11: controller
图 2 炭化温度430-600 ℃产物的分布
Figure 2 Distributions of various products at the carbonization temperature of 430-600 ℃
: CG; : W; : LG; : SC; : LO
图 3 炭化温度430-600 ℃炭化气相产物的组成
Figure 3 Compositions of GC at the carbonization temperature of 430-600 ℃
图 4 炭化温度430-600 ℃液相产物组成及其正己烷可溶物产率
Figure 4 Compositions of LMs (a) and yields of HS (b) at the carbonization temperature of 430-600 ℃
: APS; : LW; : HS
图 5 430和500 ℃下正己烷可溶物组成
Figure 5 Compositions of HSs at the carbonization temperature of 430 ℃ and 500 ℃
图 6 炭化温度430-600 ℃半焦的SEM照片
Figure 6 SEM of SCs at the carbonization temperature of 430-600 ℃
(a): 430 ℃; (b): 470 ℃; (c): 500 ℃; (d): 550 ℃; (e): 600 ℃
表 1 原料煤的工业分析和元素分析
Table 1 Proximate analysis and ultimate analysis of raw coal
Proximate analysis w/% Ultimate analysis w/% H/C
atomic ratioMad Ad Vdaf FCdaf Cdaf Hdaf Ndaf St, d Odaf* 1.74 5.69 35.76 64.24 82.40 5.16 1.00 1.75 9.59 0.75 * by difference; M: moisture; A: ash content; V: volatile matters; FC: fixed carbon; ad: air dry basis; d: dry basis; daf: dry and ash-free basis 
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表 2 炭化温度430-600 ℃半焦的基本性质
Table 2 Fundamental properties of SCs at the carbonization temperature of 430-600 ℃
tC/℃ Proximate analysis w/% Ultimate analysis w/% APS w/% G Mad Ad Vdaf Cdaf Hdaf Ndaf St, d Odaf* 430 0.10 12.62 27.74 91.05 3.79 1.24 0.92 2.87 39.14 77.38 470 0.45 12.82 17.50 91.34 3.54 1.25 0.97 2.76 9.88 15.32 500 0.56 14.36 12.35 91.91 3.14 1.27 1.02 2.49 5.47 0 550 0.33 14.86 10.50 93.41 2.88 1.32 1.01 1.19 3.49 0 600 0.57 15.39 9.42 93.99 2.70 1.36 1.04 0.72 1.28 0 * by difference; M: moisture; A: ash content; V: volatile matters; FC: fixed carbon; ad: air dry basis; d: dry basis; daf: dry and ash-free basis
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表 3 炭化温度430-600 ℃半焦的比表面积和孔结构
Table 3 Specific surface area and pore structure of SCs at the carbonization temperature of 430-600 ℃
tC/ ℃ ABET/(m2·g-1) Pore volume v/(cm3·g-1) Average pore width d/nm 430 1.34 0.001 6 9.79 470 2.96 0.003 1 7.44 500 3.94 0.004 7 6.30 550 1.29 0.002 4 11.29 600 0.30 0.002 9 15.35
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