Release of HCl and H2S during gasification of refuse derived-fuel chars
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摘要: 通过水平管式气化炉和化学吸收法,对比研究了矿化垃圾热解半焦(ARC)和常规垃圾热解半焦(NRC)在水蒸气和CO2气化过程中腐蚀性气体(HCl和H2S)的析出特性,考察了气化温度、气化介质类型和流量对腐蚀性气体析出特性的影响。当气化温度升至950℃,ARC在水蒸气气化过程中的碳气化率、HCl和H2S产率分别为66.1%、100%和74.9%,而其在CO2气化过程中的碳气化率、HCl和H2S产率分别为77.8%、100%和2.9%;NRC在水蒸气气化过程中的碳气化率、HCl和H2S产率分别为98.8%、100%和53.7%,而其在CO2气化过程中的碳气化率、HCl和H2S产率分别为100%、96.2%和10.3%。以NRC为原料,考察了水蒸气和CO2流量对其HCl和CO2析出特性的影响。NRC的HCl和H2S产率均随水蒸气流量增加而增加,但当水碳比大于等于3.3时,其促进作用不再明显。NRC的HCl产率随CO2流量的增加而增加,而H2S产率随CO2流量的增加而减小。Abstract: Using a horizontal tubular reactor together with chemical adsorption, release characteristics of corrosive gases, viz., HCl and H2S, during steam and CO2 gasification process of aged and normal refuse derived-fuels char (ARC and NRC) were investigated. Effects of gasification temperature, type and flow rate of gasification medium on their release behaviors were examined. In H2O gasification at 950℃ the carbon gasification rates, HCl and H2S yields of ARC are 66.1%, 100% and 74.9%, respectively, and those are 77.8%, 100% and 2.9% in CO2 gasification, respectively. The carbon gasification rates, HCl and H2S yields of NRC in H2O gasification are 98.8%, 100% and 53.7%, and those are 100%, 96.2% and 10.3% in CO2 gasification, respectively. The release characteristics of HCl and H2S are investigated with different flow rates of H2O and CO2 in the NRC gasification. HCl and H2S yields of NRC increase with increasing flow rate of H2O, but the promoting effect can be ignored when H2O/C is ≥ 3.3. HCl yield of NRC increases but H2S yield decreases with increasing flow rate of CO2.
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Key words:
- HCl /
- H2S /
- aged refuse derived-fules char /
- normal refuse derived-fuels char /
- gasification
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表 1 ARDF和NRDF的元素分析与工业分析
Table 1 Ultimate and proximate analyses of ARDF and NRDF
Sample Ultimate analysis wdb*/% C H N total S inorganic sulfur total Cl inorganic Cl ARDF 35.95 2.56 0.85 0.65 0.103 0.95 0.46 NRDF 57.26 6.23 0.87 0.15 0.007 1.37 0.14 *: dried basis 表 2 气化半焦原料的元素分析
Table 2 Ultimate analysis of raw material in char gasification experiment
Sample Ultimate analysis wdb*/% C H N total S inorganic sulfur total Cl inorganic Cl ARC 37.78 0.62 0.44 0.99 0.784 1.77 1.23 NRC 60.09 0.73 0.99 0.14 0.086 2.34 1.49 *: dried basis -
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