1.农业农村部长江中下游农业装备重点实验室,湖北 武汉 430070
2.华中农业大学工学院,湖北 武汉 430070
3.华中科技大学煤燃烧国家重点实验室,湖北 武汉 430074
梅道锋(1986—),男,博士,讲师,dmei@mail.hzau.edu.cn
晏水平(1980—),男,博士,教授,yanshp@mail.hzau.edu.cn
收稿:2018-10-31,
修回:2018-12-03,
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梅道锋, 赵海波, 晏水平. 基于NiO/Ca2Al2SiO7的沼气自热化学链重整制氢热分析动力学模拟[J]. 化工学报, 2019, 70(S1): 193-201 DOI: 10.11949/j.issn.0438-1157.20181282.
MEI Daofeng, ZHAO Haibo, YAN Shuiping. Thermodynamics simulation of biogas fueled chemical looping reforming for H2 generation using NiO/Ca2Al2SiO7[J]. CIESC Journal, 2019, 70(S1): 193-201 DOI: 10.11949/j.issn.0438-1157.20181282.
梅道锋, 赵海波, 晏水平. 基于NiO/Ca2Al2SiO7的沼气自热化学链重整制氢热分析动力学模拟[J]. 化工学报, 2019, 70(S1): 193-201 DOI: 10.11949/j.issn.0438-1157.20181282. DOI:
MEI Daofeng, ZHAO Haibo, YAN Shuiping. Thermodynamics simulation of biogas fueled chemical looping reforming for H2 generation using NiO/Ca2Al2SiO7[J]. CIESC Journal, 2019, 70(S1): 193-201 DOI: 10.11949/j.issn.0438-1157.20181282. DOI:
以水泥的主要成分Ca
2
Al
2
SiO
7
为惰性载体,采用热分析动力学研究了NiO/Ca
2
Al
2
SiO
7
氧载体作用下沼气的化学链重整(chemical looping reforming
CLR)制氢性能。通过自编的MATLAB
®
代码计算得到430种工况下CLR模拟结果,充分考虑NiO负载率
y
NiO
、氧载体循环流率
F
s
、氧载体转化率变化Δ
X
s
、水蒸气浓度
<math id="M1"><msub><mrow><mi>x</mi></mrow><mrow><msub><mrow><mi>H</mi></mrow><mrow><mn mathvariant="normal">2</mn></mrow></msub><mi>O</mi></mrow></msub></math>
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5.41866684
3.89466667
及空气反应器温度
T
AR
的影响。调节氧载体循环流率,可实现对(xNiO+Ca
2
Al
2
SiO
7
)/biogas质量比的控制,进而调整系统总焓变化Δ
H
,实现自热化学链重整(CLRa),即Δ
H
=0。在CLRa状态下,
T
AR
和Δ
X
s
的升高均导致H
2
产率降低,而
F
s
增加则有助于提高H
2
产率。模拟结果表明,当NiO含量低于10%(质量)、
T
AR
接近1150 K、Δ
X
s
小于0.25、
F
s
大于2 kg∙s
-1
、
<math id="M2"><msub><mrow><mi>x</mi></mrow><mrow><msub><mrow><mi>H</mi></mrow><mrow><mn mathvariant="normal">2</mn></mrow></msub><mi>O</mi></mrow></msub></math>
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5.41866684
3.89466667
小于54.5%(体积)时,H
2
产率可达最优值1.57(m
3
H
2
)∙(m
3
biogas)
-1
。对系统的热量平衡分析显示,CLRa能够在自热状态下运行,且反应器出口处气流携带热量能够满足进口处气流的预热需求。
Thermodynamics analyses were carried out in biogas fueled chemical looping reforming (CLR) process for H
2
generation
where the main component of cement Ca
2
Al
2
SiO
7
was used as a support for NiO/Ca
2
Al
2
SiO
7
oxygen carrier. Around 430 cases for CLR were studied
via
a home-built MATLAB
®
code
considering the effects of NiO loading
y
NiO
oxygen carrier circulation rate
F
s
oxygen carrier conversion variation Δ
X
s
steam concentration
<math id="M3"><msub><mrow><mi>x</mi></mrow><mrow><msub><mrow><mi>H</mi></mrow><mrow><mn mathvariant="normal">2</mn></mrow></msub><mi>O</mi></mrow></msub></math>
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5.84200001
4.23333359
and air reactor temperature
T
AR
. The global enthalpy variation Δ
H
can be easily tuned to Δ
H
=0
i
.
e
. CLRa state
by varying the (NiO+Ca
2
Al
2
SiO
7
)/biogas ratio. Under CLRa state
increase of
T
AR
and Δ
X
s
can lead to the decrease of H
2
yield
while rising of
F
s
would result in the higher H
2
yield. The simulation suggests that the optimized H
2
yield of 1.57 (m
3
H
2
)∙(m
3
biogas)
-1
can be achieved with NiO loading lower than 10%(mass)
T
AR
close to 1150 K
Δ
X
s
lower than 0.25
F
s
higher than 2 kg∙s
-1
and
<math id="M4"><msub><mrow><mi>x</mi></mrow><mrow><msub><mrow><mi>H</mi></mrow><mrow><mn mathvariant="normal">2</mn></mrow></msub><mi>O</mi></mrow></msub></math>
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5.84200001
4.23333359
lower than 54.5%(vol). Heat balance of the global FR
AR and WGS reactors showed that the CLRa can be run under auto-thermal condition
meanwhile heat at exits of reactors can be recovered to be used in the preheating of gases entering reactors.
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