撞击流式反应器内水合物法分离沼气中CO2研究

doi:10.11949/0438-1157.20191432

摘要/Abstract

摘要：

实验考察了撞击流式反应釜内水合物法分离沼气中CO₂的特性。选取纯水和十二烷基硫酸钠（SDS）两个不同的体系，考察了水合物生成过程中压力、温度、撞击强度的影响。实验结果表明在纯水体系和SDS体系下压力的升高均有利于水合物的快速生成，但并不利于沼气中的二氧化碳捕集；实验通过改变撞击流式反应器的撞击强度发现，当撞击强度为0.128时，CO₂分离因子(S.F.)在纯水和SDS两种体系下均达到最大，纯水体系下S.F.的最大值为138.9，SDS体系下S.F.的最大值为64.5；实验结果表明添加剂SDS可以促进水合物的生成，最适宜的浓度为600 mg/L，此时耗气量、CO₂水合率S.Fr.(CO₂)和CH₄水合率S.Fr.(CH₄)达到最大，但SDS对CH₄水合物生成过程的促进作用大于CO₂水合物，反而不利于CO₂的分离，降低CO₂的分离因子。

关键词: 水合物, 沼气, 分离, 二氧化碳捕集, 分离因子

Abstract:

The characteristics of CO₂ separation in biogas by hydrate method in impinging flow reactor were investigated experimentally. Two different systems, pure water and sodium dodecyl sulfate (SDS), were selected to investigate the effects of pressure, temperature and impact intensity during hydrate formation process. The experimental results showed that the increase of pressure in pure water system or SDS system was conducive to the rapid formation of hydrate, but not conducive to the CO₂ capture. By changing the impact intensity of the impinging stream reactor, it was found that the CO₂ separation factor (S.F.) reached the maximum in both systems when the impact intensity was 0.128, the maximum value of S.F were 138.9 and 64.5, respectively.The experimental results showed that the additive SDS could promote the formation of hydrate, and the optimal concentration was 600 mg/L when the gas consumption,CO₂ recovery S.Fr.(CO₂) and CH₄recoveryS.Fr.(CH₄) reached the maximum. However, the promotion effect of SDS on CH₄ hydrate formation process was greater than that of CO₂ hydrate, which was not conducive to the CO₂separation from biogas, but the separation factor of CO₂ would be reduced.

Key words: hydrate, biogas, separation, CO₂ capture, separation factor

中图分类号:

TQ 028

方书起, 张欣悦, 李思齐, 白东豪, 白净. 撞击流式反应器内水合物法分离沼气中CO₂研究[J]. 化工学报, 2020, 71(5): 2099-2108.

Shuqi FANG, Xinyue ZHANG, Siqi LI, Donghao BAI, Jing BAI. Investigation on separation of CO₂ from biogas by hydrate method in impinging stream reactor[J]. CIESC Journal, 2020, 71(5): 2099-2108.

图/表 17

图1 实验装置原理图1—气瓶；2—真空泵；3—压力表；4—恒温箱；5—反应器；6—磁力搅拌装置；7—温度传感器；8—压力传感器；9—数据采集仪；10—数据记录仪

Fig.1 Schematic diagram of experimental apparatus

图2 反应器釜体、导流筒和搅拌器结构示意图

Fig.2 Schematic diagram of reactor structure, guide tube and agitator

表1 不同转速下的撞击强度

Table 1 Impact intensity under different rotational speeds

磁力搅拌装置转速/(r/min)	撞击强度（β）
0	0
200	0.043
400	0.128
600	0.213
800	0.299
1000	0.384

图3 纯水体系不同压力下压力变化曲线和耗气量

Fig.3 Pressure curve and gas consumption under different pressures in pure water system

图4 纯水体系不同压力下的S.Fr.(CO2)、S.Fr.(CH4)和剩余气相CH4浓度 (y1)

Fig.4 CO2 recovery S.Fr.(CO2), CH4 recovery S.Fr.(CH4) and CH4 concentration of residual gas phase under different pressures in pure water system

图5 纯水体系不同压力下CO2分离因子(S.F.)

Fig.5 Separation factor(S.F.) under different pressures in pure water system

图6 纯水体系不同温度下的S.Fr.(CO2)、S.Fr.(CH4)和剩余气相CH4浓度 (y1)

Fig.6 CO2 recovery S.Fr.(CO2), CH4 recovery S.Fr.(CH4) and CH4 concentration of residual gas phase under different temperatures in pure water system

图7 纯水体系不同温度下的分离因子(S.F.)

Fig.7 Separation factor (S.F.) under different temperature in pure water system

图8 纯水体系不同撞击强度下的S.Fr.(CO2)、S.Fr.(CH4)和剩余气相CH4浓度 (y1)

Fig.8 CO2 recovery S.Fr.(CO2), CH4 recovery S.Fr.(CH4) and CH4 concentration of residual gas phase under different impact intensities in pure water system

图9 纯水体系不同撞击强度下和分离因子(S.F.)

Fig.9 Separation factor (S.F.) under different impact intensities in pure water system

图10 SDS体系不同浓度下的S.Fr.(CO2)、S.Fr.(CH4)和剩余气相CH4浓度 (y1)

Fig.10 CO2 recovery S.Fr.(CO2), CH4 recovery S.Fr.(CH4) and CH4 concentration of residual gas phase under different concentrations in SDS system

图11 SDS不同浓度下分离因子 (S.F.)

Fig.11 Separation factor (S.F.) under different concentrations in SDS system

图12 SDS和纯水体系不同压力下的耗气量对比

Fig.12 Comparison of gas consumption under different pressures in SDS and pure water system

图13 不同压力下的S.Fr.(CO2)和S.Fr.(CH4)对比

Fig.13 CO2 recovery S.Fr.(CO2) and CH4 recovery S.Fr.(CH4) under different pressures

图14 不同压力下的CO2分离因子(S.F.)对比

Fig.14 Separation factor (S.F.) under different pressures

图15 不同撞击强度下的S.Fr.(CO2)和S.Fr.(CH4)对比

Fig.15 CO2 recovery S.Fr.(CO2) and CH4 recovery S.Fr.(CH4) under different impact intensities

图16 不同撞击强度下的剩余气相CH4浓度 (y1)和CO2分离因子 (S.F.)对比

Fig.16 CH4 concentration of residual gas phase and separation factor (S.F.) under different impact intensities

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撞击流式反应器内水合物法分离沼气中CO₂研究

Investigation on separation of CO₂ from biogas by hydrate method in impinging stream reactor

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