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The CO2 capture process using ionic liquids (ILs) in the coal-fired power plant is simulated, in which the physical properties of ILs and ILs-CO2 phase equilibria are modelled based on experimental data. Analysis shows that the increase of packed height and absorption pressure is beneficial for CO2 absorption, while the inlet temperature has the dual effect as it influences both the ILs viscosity and CO2 solubility. The optimum condition is determined with 20 m packed height, 4 MPa absorption pressure and 50 ℃ inlet temperature. The regeneration process is more energy efficient with pressure swing method, in which the pressure of ILs-CO2 stream is reduced to 0.1 MPa with almost no ILs loss. Energy consumption and cost analysis shows that the multistage compressor is the most energy-intensive unit, and the absorption pressure has the largest effect on the system with 4 MPa the optimum parameter. With the optimum condition, the energy consumption of the process is 2.21 GJ/t, which is more energy-efficient than the conventional carbon capture system using monoethanolamine.

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CO2捕集过程的高能耗限制了减排技术的应用,开发新型高效的捕集介质是降低能耗、推广减排技术的关键。利用实验数据对离子液体[hmim][Tf2N]的物性以及[hmim][Tf2N]-CO2气液相平衡进行建模,搭建了物理吸收CO2的燃煤电厂脱碳工艺流程模型。结果显示,填料高度和吸收压力的提高对CO2吸收有利,贫液进料温度会影响CO2溶解度和离子液体黏度,使CO2脱除率先上升后下降。综上,选取吸收塔填料高度为20 m、吸收压力为4.0 MPa、贫液进料温度50 ℃为最优操作条件。为了降低能耗,再生过程中采取变压方式,将高压富液减压至0.1 MPa实现CO2分离和离子液体再生,几乎没有介质损耗。对系统的能耗分析表明,多级压缩机在系统中能耗最高,吸收压力对系统能耗和成本影响最大,4.0 MPa吸收压力下系统经济性较高。在优选条件下,CO2捕集能耗为2.21 GJ/t,相比传统乙醇胺脱碳系统更加节能。

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刘逸芸(1995),女,博士,工程师,主要研究方向为环保技术,

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刘逸芸(1995),女,博士,工程师,主要研究方向为环保技术,

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figureFileSmall=C403prsllRu4Txju69QQWw==, figureFileBig=HC41on/0V9+qwH0XunF3bA==, tableContent=null), ArticleFig(id=1240938922172273505, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222543594922172954, language=EN, label=Fig.6, caption=Effect of absorber pressure on the CO2 absorption efficiency with 500 kmol/h ILs flow (solid) and the ILs flow rate needed to reach 90% CO2 absorption, figureFileSmall=2PLmUG+Dysl59vleH7yTRA==, figureFileBig=naPV1ib617bXAGF2MvLD7w==, tableContent=null), ArticleFig(id=1240938922323268459, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222543594922172954, language=CN, label=图6, caption=吸收压力在贫液流量500 kmol/h下对CO2脱除率的影响以及达到90% CO2脱除率所需要的贫液流量, figureFileSmall=2PLmUG+Dysl59vleH7yTRA==, figureFileBig=naPV1ib617bXAGF2MvLD7w==, tableContent=null), ArticleFig(id=1240938922419737456, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222543594922172954, language=EN, label=Fig.7, caption=Effect of inlet temperature on the CO2 absorption efficiency with rate-based or equilibrium calculation mode, figureFileSmall=dk5YXkO94/xXvLDHW2D80Q==, figureFileBig=kqV7vT+0myDQiqaDmBT1LQ==, tableContent=null), ArticleFig(id=1240938922512012148, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222543594922172954, language=CN, label=图7, caption=速率模式和平衡模式计算下贫液进料温度对CO2脱除率的影响, figureFileSmall=dk5YXkO94/xXvLDHW2D80Q==, figureFileBig=kqV7vT+0myDQiqaDmBT1LQ==, tableContent=null), ArticleFig(id=1240938922612675450, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222543594922172954, language=EN, label=Fig.8, caption=Effect of regeneration pressure on the regeneration temperature, regeneration energy consumption and ILs loss, figureFileSmall=Qe776Z1rdBzVy7y25QaLwQ==, figureFileBig=nx8/407PPJKehNnEsLVM0w==, tableContent=null), ArticleFig(id=1240938922730115969, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222543594922172954, language=CN, label=图8, caption=再生压力对再生温度、再生能耗和吸收剂损耗的影响, figureFileSmall=Qe776Z1rdBzVy7y25QaLwQ==, figureFileBig=nx8/407PPJKehNnEsLVM0w==, tableContent=null), ArticleFig(id=1240938922830779269, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222543594922172954, language=EN, label=Fig.9, caption=Effect of absorber pressure on the energy consumptions and ILs flow rate, figureFileSmall=J7X77HD6z1L/HFoVHmlmPw==, figureFileBig=tcH0anl3QcaTXLNj2D21Ow==, tableContent=null), ArticleFig(id=1240938922935636878, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222543594922172954, language=CN, label=图9, caption=吸收压力对捕集过程能耗(多级压缩机、贫液泵和总能耗)以及贫液流量的影响, figureFileSmall=J7X77HD6z1L/HFoVHmlmPw==, figureFileBig=tcH0anl3QcaTXLNj2D21Ow==, tableContent=null), ArticleFig(id=1240938923040494480, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222543594922172954, language=EN, label=Tab.1, caption=

Critical properties of [hmim][Tf2N]

, figureFileSmall=null, figureFileBig=null, tableContent=
项目数值
临界压力pc/MPa1.611
临界温度Tc/K815
偏心因子ω0.855 6
临界体积Vc/(m3·mol–1)1.104 4
压缩系数Zc0.262 6
), ArticleFig(id=1240938923136963482, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222543594922172954, language=CN, label=表1, caption=

[hmim][Tf2N]的临界性质

, figureFileSmall=null, figureFileBig=null, tableContent=
项目数值
临界压力pc/MPa1.611
临界温度Tc/K815
偏心因子ω0.855 6
临界体积Vc/(m3·mol–1)1.104 4
压缩系数Zc0.262 6
), ArticleFig(id=1240938923254404000, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222543594922172954, language=EN, label=Tab.2, caption=

Fitting parameters of [hmim][Tf2N] basic properties

, figureFileSmall=null, figureFileBig=null, tableContent=
变量C1C2C3
密度ρ320.90.206 41.339×10–4
表面张力σ52.301.420–0.849 1
热容cp–4.583×10–21.004×10–4–8.191×10–8
蒸汽压力p28.32–14 8490
黏度η–7.32601.238×10–8
), ArticleFig(id=1240938923401204652, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222543594922172954, language=CN, label=表2, caption=

[hmim][Tf2N]基础性质的拟合参数

, figureFileSmall=null, figureFileBig=null, tableContent=
变量C1C2C3
密度ρ320.90.206 41.339×10–4
表面张力σ52.301.420–0.849 1
热容cp–4.583×10–21.004×10–4–8.191×10–8
蒸汽压力p28.32–14 8490
黏度η–7.32601.238×10–8
), ArticleFig(id=1240938923514450869, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222543594922172954, language=EN, label=Tab.3, caption=

Initial specification of absorber inlet streams

, figureFileSmall=null, figureFileBig=null, tableContent=
项目烟气捕集介质
温度/℃5050
压力/MPa3.03.0
总流量/(kmol·h–1)245500
CO2摩尔分数/%141
N2摩尔分数/%80
O2摩尔分数/%6
[hmim][Tf2N]摩尔分数/%99
), ArticleFig(id=1240938923602531262, tenantId=1146029695717560320, journalId=1210938733613449225, articleId=1222543594922172954, language=CN, label=表3, caption=

吸收塔初始进料情况

, figureFileSmall=null, figureFileBig=null, tableContent=
项目烟气捕集介质
温度/℃5050
压力/MPa3.03.0
总流量/(kmol·h–1)245500
CO2摩尔分数/%141
N2摩尔分数/%80
O2摩尔分数/%6
[hmim][Tf2N]摩尔分数/%99
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离子液体捕集火电厂烟气CO2模拟与分析
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刘逸芸 1 , 刘向阳 2 , 贾林权 1 , 牛国平 1 , 蒙毅 1 , 谭增强 1
热力发电 | 热能科学研究 2023,52(12): 115-123
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热力发电 | 热能科学研究 2023, 52(12): 115-123
离子液体捕集火电厂烟气CO2模拟与分析
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刘逸芸1 , 刘向阳2, 贾林权1, 牛国平1, 蒙毅1, 谭增强1
作者信息
  • 1.西安西热锅炉环保工程有限公司,陕西 西安 710054
  • 2.西安交通大学能源与动力工程学院,陕西 西安 710049
  • 刘逸芸(1995),女,博士,工程师,主要研究方向为环保技术,

Simulation analysis of CO2 capture at coal-fired power plant with ionic liquids
Yiyun LIU1 , Xiangyang LIU2, Linquan JIA1, Guoping NIU1, Yi MENG1, Zengqiang TAN1
Affiliations
  • 1.Xi’an Xi Re Boiler Environmental Protection Engineering Co., Ltd., Xi’an 710054, China
  • 2.School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
出版时间: 2023-12-25 doi: 10.19666/j.rlfd.202304052
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CO2捕集过程的高能耗限制了减排技术的应用,开发新型高效的捕集介质是降低能耗、推广减排技术的关键。利用实验数据对离子液体[hmim][Tf2N]的物性以及[hmim][Tf2N]-CO2气液相平衡进行建模,搭建了物理吸收CO2的燃煤电厂脱碳工艺流程模型。结果显示,填料高度和吸收压力的提高对CO2吸收有利,贫液进料温度会影响CO2溶解度和离子液体黏度,使CO2脱除率先上升后下降。综上,选取吸收塔填料高度为20 m、吸收压力为4.0 MPa、贫液进料温度50 ℃为最优操作条件。为了降低能耗,再生过程中采取变压方式,将高压富液减压至0.1 MPa实现CO2分离和离子液体再生,几乎没有介质损耗。对系统的能耗分析表明,多级压缩机在系统中能耗最高,吸收压力对系统能耗和成本影响最大,4.0 MPa吸收压力下系统经济性较高。在优选条件下,CO2捕集能耗为2.21 GJ/t,相比传统乙醇胺脱碳系统更加节能。

离子液体  /  CO2捕集  /  物理吸收  /  燃煤电厂

The CO2 capture process using ionic liquids (ILs) in the coal-fired power plant is simulated, in which the physical properties of ILs and ILs-CO2 phase equilibria are modelled based on experimental data. Analysis shows that the increase of packed height and absorption pressure is beneficial for CO2 absorption, while the inlet temperature has the dual effect as it influences both the ILs viscosity and CO2 solubility. The optimum condition is determined with 20 m packed height, 4 MPa absorption pressure and 50 ℃ inlet temperature. The regeneration process is more energy efficient with pressure swing method, in which the pressure of ILs-CO2 stream is reduced to 0.1 MPa with almost no ILs loss. Energy consumption and cost analysis shows that the multistage compressor is the most energy-intensive unit, and the absorption pressure has the largest effect on the system with 4 MPa the optimum parameter. With the optimum condition, the energy consumption of the process is 2.21 GJ/t, which is more energy-efficient than the conventional carbon capture system using monoethanolamine.

ionic liquids  /  CO2 capture  /  physical absorption  /  coal-fired power plant
刘逸芸, 刘向阳, 贾林权, 牛国平, 蒙毅, 谭增强. 离子液体捕集火电厂烟气CO2模拟与分析. 热力发电, 2023 , 52 (12) : 115 -123 . DOI: 10.19666/j.rlfd.202304052
Yiyun LIU, Xiangyang LIU, Linquan JIA, Guoping NIU, Yi MENG, Zengqiang TAN. Simulation analysis of CO2 capture at coal-fired power plant with ionic liquids[J]. Thermal Power Generation, 2023 , 52 (12) : 115 -123 . DOI: 10.19666/j.rlfd.202304052
我国“富煤、贫油、少气”的能源格局,决定了煤炭在一段时间内仍将占据中国能源消费的主导地位[1]。截至2020年年底,全国口径煤电装机容量占总装机容量的49.1%。燃煤电厂CO2排放占全国总排放量的40%~50%,是我国最大的CO2排放单一来源,也是减排CO2最值得关注的领域。
CO2的捕集与封存(CCS)技术可以将燃煤电厂产生的CO2收集并储存起来,被认为是减少温室气体排放的有效手段[2-4]。目前,燃煤电厂中主流的CO2的捕集工艺可以分为燃烧前捕集、富氧燃烧捕集和燃烧后捕集3类[5-6]。其中,以乙醇胺等烷基醇胺作为捕集介质的燃烧后捕集方法是目前应用最广的减排工艺[7-9]。该技术通过在传统燃煤电厂的尾气处理系统中加入CO2捕集装置,对烟气中的CO2进行吸收[10]。这种技术路线原理简单,对现有电站继承性好。但是,由于燃煤电厂尾气中的CO2体积分数低(10%~20%),且体系成分复杂,导致醇胺法的设备体系庞大,能耗高,减排成本高昂[8,11],还存在溶剂损失大、设备腐蚀严重、容易造成二次污染等缺陷。因此,开发新型的捕集介质是推广CCS技术、实现CO2减排的关键[12-14]
近年来,由有机阴阳离子组成的盐类化合物离子液体(ionic liquid,ILs)作为一种潜在CO2捕集介质,受到了广泛关注[15-17]。离子液体可以有效溶解CO2,并具有不挥发性、可设计性和高选择性等特点[16],从而降低捕集过程的能耗和环境污染。传统离子液体可以直接通过物理溶解作用在高压低温下吸收CO2,再通过减压闪蒸实现溶剂再生[15]。咪唑基离子[Cnmim]是研究最为广泛的离子液体阳离子之一[18]。研究表明,咪唑基离子中正电荷分散在不饱和环中,可以和CO2形成加合物以促进CO2溶解[19]。多项研究利用含咪唑基阳离子的离子液体作为碳捕集的溶剂[20-21],其在后续的CO2转化中也有不俗的表现[22-23]。在比较阴离子对离子液体性质影响的研究中,大多也以咪唑基离子作为阳离子[6]。其中,三氟甲磺酰亚胺阴离子[Tf2N]与CO2具有更高的亲和性[24-26]。在含有[Tf2N]阴离子的离子液体中,CO2溶解度更高、选择性更好,在捕集过程中不容易吸收N2和H2O[27]。这类离子液体相较含有其他阴离子的离子液体来说黏度更小(黏度由低到高为[Tf2N]<[CF3SO3]<[BF4]<[PF6])[16],且普遍热稳定性高,熔点低,是作为CO2捕集介质的优秀候选溶剂[26-28]
现有的研究大多通过实验室研究[29-30]或理论计算[31-33]对于各种离子液体的物理性质以及包括CO2等气体在离子液体中的溶解度进行探究,但对于离子液体捕集CO2的全过程研究不足。离子液体1-己基-3-甲基咪唑双三氟甲磺酰亚胺([hmim][Tf2N],图1)是国际纯粹与应用化学联合会(IUPAC)选取建立热物性数据库的标准参考流体,因此本文选取[hmim][Tf2N]作为研究对象来模拟离子液体对火电厂烟气CO2的捕集过程。在对[hmim][Tf2N]的物理性质进行建模的基础上,通过数值计算对[hmim][Tf2N]捕集CO2的物理吸收过程进行模拟优化,分析影响碳捕集能耗的关键因素,以期推动离子液体作为CO2捕集介质的工业应用。
为了模拟[hmim][Tf2N]捕集CO2过程,利用实验数据对[hmim][Tf2N]的物性进行了建模。其中,Ren等人[34]利用基团贡献法估算给出了[hmim][Tf2N]的临界压力pc、临界温度Tc和偏心因子ω,而通过Valderrama等人[35]给出的关联式可以估算出[hmim][Tf2N]的临界体积Vc和压缩系数Zc表1),与实验值的平均偏差为1.6%。
包括密度、表面张力、热容、蒸汽压力、黏度在内的5种温度相关的基础性质可以由式(1)—式(5)来进行关联,通过对常压下的实验数据进行拟合得到相应的关联式。[hmim][Tf2N]在不同温度下的密度采用根据美国材料实验协会的标准方法D7042—04测量得到的数据[36],标准偏差为0.03 kg/m3,并通过式(1)进行拟合。
ρ=1 000MwC1+C2T+C3T2
不同温度下的表面张力采用Wilhelmy板法测量得到的数据[37],标准偏差为0.039 mN/m,并通过式(2)进行拟合。
σ=C1(1TTc)C2+C3TTc
不同温度下的热容采用绝热量热计测量得到的数据[38],标准偏差为0.24 J/(mol·K),并通过式(3)进行拟合。
cp=C1+C2T+C3T2
不同温度下的蒸汽压力采用Knudsen隙透法测量得到的数据[39],标准偏差小于0.67 mPa,并通过式(4)进行拟合。
lnp=C1+C2T+C3
不同温度下的黏度也采用根据美国材料实验协会的标准方法D7042—04测量得到的数据[36],测量偏差在0.002 6~2.900 0 mPa·s内随温度降低而增大,并通过式(5)进行拟合。
lnη=C1+C2/T+C3/T2
式中:ρ为密度,kg/m3Mw为[hmim][Tf2N]摩尔质量,g/mol;σ为表面张力,mN/m;Tc为[hmim][Tf2N]的临界温度,K;cp为热容,J/(mol·K);p为蒸汽压力,Pa;η为黏度,mPa·s;T为温度,K;C1C2C3为方程的系数,其拟合结果见表2
图2为离子液体[hmim][Tf2N]的密度、表面张力、热容、蒸汽压力和黏度实验值与模拟值对比。由图2可知,所选函数对密度、表面张力、热容、蒸汽压力和黏度数据的拟合精度R2分别为0.999 9、0.998 9、0.999 9、0.999 9和0.995 5,可以很好地与实验数据相关联,并为过程模拟提供准确的性质估算。
采用Peng-Robinson(PR)状态方程拟合了[hmim][Tf2N]-CO2体系气液相平衡数据,对捕集过程进行模拟[40-41]。PR方程形式简单易于计算,适用于各种压力下的平衡计算,尤其是可以较好地计算高压下的相平衡,常被用于模拟气体在离子液体中的溶解相平衡[42-43]。由于离子液体分子量大,其分子间作用力较强,因此在标准的PR方程中引入了Boston-Mathias(BM)α函数和不对称混合规则,从而实现对极性非理想体系的模拟[44-45]。PR-BM模型的状态方程可以写成以下形式:
p=RTVmbaVm(Vm+b)+b(Vmb)
式中:Vm为摩尔体积;参数ab由式(7)、式(8)定义。
b=xibi
a=a0+a1
式中:a0代表标准二次混合规则项,可以通过式(9)与二元交互作用常数kij相关联。而kij的值与温度有关,可以进一步通过式(10)进行计算,其中kij=kjia1则代表非对称混合项,用来更好地模拟高度非线性体系,通过式(11)来计算。温度相关的lij通过式(12)来计算,其中lij≠lji
a0=ninj(aiaj)1/2(1kij)
kij=k0+k1T+k2T
a1=i=1nxi(j=1nxj((aiaj)1/2lij)1/3)3
lij=l0+l1T+l2T
式中:aibi为只与纯物质的临界性质有关的函数[46]k0k1k2以及l0l1l2为[hmim][Tf2N]与CO2之间的二元交互作用系数,可通过对CO2在[hmim][Tf2N]的溶解度数据进行回归得到。
CO2的溶解度采用Kumełan等人通过自制耐压容器测量得到的数据[47],拟合精度R2为0.987 9,图3为[hmim][Tf2N]-CO2二元体系的压力-温度-组成(p-T-x)相图。对比图3中实验值和模拟结果可见,该模型对于[hmim][Tf2N]-CO2的气液相平衡的模拟与实验数据具有较高的一致性,可以用于对CO2捕集过程的模拟。N2和O2在离子液体中的溶解度非常低,在常压下只有CO2溶解度的1/30[48],因此在模拟中不考虑其影响。
模拟搭建了以离子液体[hmim][Tf2N]作为捕集介质的燃煤电厂烟气脱碳的工艺流程,具体如图4所示。CO2的物理吸收过程通常包括用于烟气中CO2吸收的吸收单元以及用于再生捕集介质的再生单元2部分。模拟采用国内燃煤电厂经过脱硝脱硫除尘后的烟气情况,温度为50 ℃,压力为0.1 MPa,烟气组成中N2:CO2:O2的摩尔比为80:14:6。烟气在进入吸收单元之前,首先需要加压来提高吸收效率。多级压缩机之间设置间冷器,将高温高压烟气冷却并分离出水分,压缩之后的烟气可以认为没有水分。
以CO2捕集量1万t/a为目标,设定进入吸收塔的烟气情况,具体见表3
考虑捕集介质循环利用,离子液体进料含有99%的[hmim][Tf2N]。填料吸收塔中烟气和离子液体形成逆流。脱碳后的烟气从顶部排出,而[hmim][Tf2N]-CO2富液从塔底流出进入再生单元。吸收塔采用考虑传质动力学的速率模型,以获得更精确的模拟结果。初始设置操作压力为3 MPa,填料高度为20 m,塔径为1.77 m,以使液泛率在80%以下。气液两相传质系数和相界面由Onda等人[49]总结的关系式估算:
kL=0.051(Re'L)2/3ScL0.5(apdp)0.4(ηLgρL)1/3kV=CReV0.7ScV1/3apDV(apdp)2aI=apAthp(1exp(1.45(σcσ)0.75ReL0.1FrL0.05WeL0.2))
式中:kLkV分别为液体和气体的二元传质系数;aI为传质相界面;ReLReV分别为液体和气体的雷诺数;ReL为液体基于湿表面积的雷诺数;ScLScV分别为液体和气体的施密特数;FrLWeL分别为液体的弗劳德数和韦伯数;ηLρLσ分别为液体的黏度、密度和表面张力;DV为气体的扩散率;apdphpσc为填料的比表面积、尺寸、高度和临界表面张力;At为填料塔的截面积;g为重力常数;在dp <0.015 m时常数C取2.00,反之C取5.23。
吸收塔是捕集过程中的关键设备,因此在以上参数的基础上分析研究了吸收塔的填料高度(10~30 m)、操作压力(1.0~6.0 MPa)、贫液进料温度(20~100 ℃)对吸收效率的影响,以及在相应条件下达到90% CO2脱除率所需要的液体流量。CO2脱除率的定义为:
TCO2=1xT,CO2xF,CO2
式中:TCO2为CO2脱除率;xT,CO2xF,CO2分别为脱碳烟气和富碳烟气中CO2体积分数。
再生单元中,[hmim][Tf2N]-CO2富液与贫液进行换热之后进入闪蒸器再生,目标为离子液体纯度达到99%。再生之后的贫液经由贫液泵重新加压,冷却后泵入吸收塔中循环利用。在模拟分析中,探究了变压和变温对于再生能耗和介质损耗的影响。
离子液体捕集过程的关键在于变压过程的压力调节,因此进一步分析了吸收压力对系统能耗的影响。系统能耗涵盖多级压缩机、贫液泵和闪蒸罐的能耗,前二者分别考虑烟气压缩后的焓变以及贫液加压后获得的能量(泵效率75%),后者考虑变温过程中流股的升温显热、相变潜热和解吸热。
吸收塔填料高度的增加可以增大气液两相的接触,从而提高整体的吸收效率,但另一方面会增加塔的建设成本。在贫液流量为500 kmol/h时,探究了填料高度对CO2吸收的影响,结果如图5所示。
图5可见,随着填料高度由10 m增加到30 m,CO2脱除率从46%提高到81%,但并未实现90%的脱除率要求。因此,进一步研究了在不同填料高度下,达到90% CO2脱除率所需要的贫液流量。由图5还可见,随着填料高度的增加,所需贫液流量逐渐下降。填料高度为10 m时需要3 026 kmol/h的贫液才能实现90%的CO2脱除率;而填料高度为30 m时,只需要754 kmol/h的贫液;此外,当填料高度达到20 m以上时,继续增加填料所能减少的贫液流量有限。考虑塔顶和塔釜需要预留一定设计高度,而塔高超过30 m时会极大增加设备的建设投资,因此20 m左右是CO2吸收塔较优的填料高度。
离子液体[hmim][Tf2N]对CO2的吸收是物理吸收过程,提高操作压力可以增大CO2的溶解度,从而提高传质驱动力和CO2脱除率。在贫液流量500 kmol/h下,吸收压力对CO2脱除率的影响如图6所示。由图6可见,在贫液流量为500 kmol/h时,随着操作压力由1.0 MPa提高到6.0 MPa,CO2的脱除率从26%提高到98%。通过求导可知,当操作压力提高到4.5 MPa以上时,CO2脱除率随着压力提高的变化幅度减小。进一步探究在不同操作压力下,达到90% CO2脱除率所需要的贫液流量。结果显示:在1.0 MPa操作压力下需要4 034 kmol/h贫液以达到90%脱除率;而在6.0 MPa操作压力下,只需要318 kmol/h贫液,所需贫液流量降低了12.7倍,说明操作压力对于CO2吸收效率具有显著影响。此外,通过求导可知当操作压力达到4.0 MPa以上时,贫液流量减小的幅度变缓。提高操作压力需要将进料物流加压到更高压力,增加压缩机和贫液泵的能耗。综合考虑选取4.0 MPa为较优的吸收压力。
温度也是影响CO2脱除率的重要因素。由图3可知,随着温度的升高,CO2溶解度逐渐减小,吸收塔中传质驱动力也逐渐减小。吸收塔内的温度主要受到离子液体贫液的温度影响,因此可以通过改变贫液的进料温度来调控塔内的操作温度,探究在20~100 ℃下CO2脱除率的变化情况,结果如图7所示。根据溶解度变化,CO2脱除率应该随着温度上升而降低。然而一方面,若采用考虑传质动力学的速率模型计算,CO2脱除率在20~50 ℃内随温度上升而提高,在50~100 ℃内则随温度上升而降低。另一方面,若采用不考虑传质过程的平衡模型来计算,则CO2脱除率在20~100 ℃内都随温度上升而降低。这说明CO2的吸收过程在20~50 ℃内主要受到传质速率的限制。
离子液体的一大缺陷在于其高黏度,这往往导致离子液体-CO2体系传质速率低,影响CO2的吸收。虽然[hmim][Tf2N]在较低温度下对CO2溶解更好,但是高黏度使得吸收过程无法达到气液平衡状态,反而降低了CO2脱除率。在20~50 ℃,随着温度升高,[hmim][Tf2N]黏度下降,传质速率提高,从而CO2脱除率也逐渐提高。当温度达到50 ℃以上时,[hmim][Tf2N]黏度已经足够小,传质速率对吸收过程的影响小于CO2溶解度的影响,CO2脱除率开始随温度上升而下降。因此,[hmim][Tf2N]吸收CO2的最佳温度选取为50 ℃。此外,对比速率模型和平衡模型2种计算结果可以发现,即使在50 ℃以上,速率模型的CO2脱除率总是小于平衡模型的脱除率,这说明传质过程仍然限制着CO2的吸收。
再生过程可以通过变压和变温2种形式来实现。为了降低离子液体再生过程的能耗,并减小可能造成的捕集介质的损失,探究了变压和变温方式对离子液体再生过程的影响,结果如图8所示。吸收过程的填料高度、吸收压力和贫液进料温度采用2.1节优化后的参数。
图8可知,随着再生压力的提高(与吸收过程的压力差减小),再生离子液体到99%纯度所需的温度显著提高。当再生压力为0.1 MPa时,只需要45 ℃就可以再生得到99%纯度的离子液体。因此在吸收塔操作温度为50 ℃的情况下,可以得到离子液体纯度大于99%的贫液。再生压力从0.1 MPa提高到0.4 MPa的过程中,再生温度迅速上升至370 ℃。若继续提高再生压力,所需再生温度的提高幅度减小。当再生压力为1.0 MPa时,所需的再生温度达到488 ℃。
再生能耗随再生压力的变化与再生温度的变化呈相同趋势,说明温度是影响再生能耗的主要因素。当再生压力为0.1 MPa时,由于所需再生温度很低,再生能耗只有0.1 MW;当再生压力从0.1 MPa提高到0.4 MPa,再生能耗迅速增加到30 MW;继续提高再生压力到1.0 MPa时,能耗则达到48 MW。虽然提高再生压力减小了与吸收过程的压力差,在一定程度上降低了贫液泵的能耗,但是需要将富液提高到更高的温度来实现离子液体的再生。由于离子液体[hmim][Tf2N]热容比较高(图2),通过变温来实现再生会造成更高的能量消耗。Xie等人[50]的研究也表明,通过变压来实现离子液体-CO2体系再生的能耗要远低于变温过程,也低于同时变压变温再生过程的能耗。
此外,随着再生压力的提高,所需再生温度升高,离子液体的损耗也逐渐增大。当再生压力为0.1 MPa时,再生温度为45 ℃,[hmim][Tf2N]在再生过程中的损耗为1.2×10–5 kmol/h,几乎可以看作没有损耗;当再生压力为0.4 MPa时,再生温度为370 ℃,离子液体损耗达到20 kmol/h;当再生温度达到400 ℃以上,开始接近[hmim][Tf2N]的沸点(常压下443 ℃),导致其损耗显著增加;1.0 MPa再生压力下损耗为401 kmol/h,达到液体总量的80%。由此可见,将高压富液减压至常压实现离子液体再生是更加经济节能的。
综合以上分析,吸收过程选取填料高度20 m、贫液进料温度50 ℃、吸收压力4.0 MPa、再生过程选取变压方式、再生压力0.1 MPa为最优条件。在此基础上,进一步分析了达到90% CO2脱除率时全过程的捕集能耗。离子液体[hmim][Tf2N]主要通过变压物理方式捕集CO2,吸收压力对于系统能耗的影响最大,主要耗能单元是多级压缩机和贫液泵。其中,多级压缩机的能耗为0.72 MW,占到了总能耗的86%,而贫液泵的能耗为0.12 MW。
探究系统能耗随吸收压力的变化规律,结果如图9所示。由图9可以发现,当吸收压力从1.0 MPa提高到6.0 MPa,多级压缩机的能耗从0.43 MW增大到0.81 MW,而贫液泵的能耗则从0.23 MW减小到0.08 MW。这是因为在本系统中烟气的处理量一定,初始压力也一定,因此多级压缩机的能耗取决于烟气进入吸收塔需要达到的压力。脱碳后的高压烟气可以通过透平机回收膨胀功,从而回收部分电能。对于贫液泵来说,随着吸收压力的提高,达到90% CO2脱除率所需要的离子液体流量降低,因此虽然贫液需要达到的压力提高,但贫液泵的能耗却呈下降趋势。在工程应用中,可以串联多个闪蒸罐逐级减压,以降低后续CO2储存时再次加压的能耗。由于多级压缩机是系统中能耗最大的单元,系统总能耗仍随吸收压力的提高而从0.66 MW增大到0.89 MW;而系统所需贫液流量随吸收压力的提高从4 034 kmol/h减小到318 kmol/h,吸收塔等设备的投资成本可以随之降低。在优选的4.0 MPa吸收压力下,降低压力(到1.0 MPa)最多只能减小不到20%的系统能耗,而所需贫液流量却随压力的减小增加了6.8倍,因此4.0 MPa吸收压力也是能耗较低的选择。
在工程应用中,需要综合考虑关键设备的投资成本以及系统能耗等带来的操作成本。随着操作压力的上升,对除关键设备外其他相关设备的要求也会提高,从而增加设备制造和系统维护的成本。这一点也应在经济性评估中予以考量,从而选择最佳的CO2捕集条件。在本系统的优化条件下,CO2捕集量为1.36 t/h,按照年运行8 000 h计算,年捕集量为1.09万t。系统总能耗为1.20 MW,即CO2捕集能耗为3.17 GJ/t(以CO2计,下同),显著低于传统乙醇胺系统的捕集能耗(3.50~4.97 GJ/t)[9,50]
通过对离子液体[hmim][Tf2N]的物性以及CO2-[hmim][Tf2N]气液相平衡进行模拟,搭建了物理吸收CO2的燃煤电厂脱碳工艺流程,主要结论如下。
1)吸收过程中,填料高度和吸收压力的增加有利于CO2吸收,一定CO2脱除率下所需的贫液流量减小;贫液进料温度的提高会降低CO2的溶解度,但同时也降低了离子液体的黏度,CO2脱除率随温度的提高先上升后下降。综合以上,选取填料高度20 m、吸收压力4.0 MPa、贫液进料温度50 ℃为最优操作条件。
2)再生过程中,随着再生压力的提高,再生离子液体的所需温度显著升高,这导致再生能耗和离子液体的损耗都急剧增加。因此,再生过程通过变压方式,将高压富液减压至0.1 MPa的能耗最低,且几乎没有介质损耗。
3)全系统能耗分析表明,多级压缩机是能耗最高的单元,吸收压力对于系统能耗的影响最大。吸收压力的提高会增加系统能耗,但同时有利于减少液体循环量,降低设备投资成本。在优选条件下,CO2捕集能耗为2.21 GJ/t,相比传统乙醇胺脱碳系统更加节能。
4)从模拟过程可以看出,对离子液体捕集CO2过程的研究设计需要建立在对离子液体以及二元体系性质的准确测量之上。新开发的离子液体介质缺乏物性研究同时价格昂贵,限制了其在捕集系统中的应用。此外,离子液体在实际工业应用中的数据匮乏,有必要开展工程试验来更好地评估离子液体体系在不同湿度、气体杂质、含尘等真实工况下的表现。
  • 国家自然科学基金项目(51976072)
  • 中国华能集团有限公司总部科技项目“基础能源科技研究专项”(HNKJ20-H50)
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2023年第52卷第12期
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doi: 10.19666/j.rlfd.202304052
  • 接收时间:2023-04-26
  • 首发时间:2026-01-26
  • 出版时间:2023-12-25
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  • 收稿日期:2023-04-26
基金
National Natural Science Foundation of China(51976072)
国家自然科学基金项目(51976072)
Science and Technology Project of China Huaneng Group Co., Ltd.(HNKJ20-H50)
中国华能集团有限公司总部科技项目“基础能源科技研究专项”(HNKJ20-H50)
作者信息
    1.西安西热锅炉环保工程有限公司,陕西 西安 710054
    2.西安交通大学能源与动力工程学院,陕西 西安 710049
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species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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