An integrated vacuum pressure swing adsorption(VPSA) and Rectisol process is proposed for CO_(2) capture from underground coal gasification(UCG) syngas. A ten-bed VPSA process with silica gel adsorbent is firstly desi...An integrated vacuum pressure swing adsorption(VPSA) and Rectisol process is proposed for CO_(2) capture from underground coal gasification(UCG) syngas. A ten-bed VPSA process with silica gel adsorbent is firstly designed to pre-separate and capture 74.57% CO_(2) with a CO_(2) purity of 98.35% from UCG syngas(CH_(4)/CO/CO_(2)/H_(2)/N_(2)= 30.77%/6.15%/44.10%/18.46%/0.52%, mole fraction, from Shaar Lake Mine Field,Xinjiang Province, China) with a feed pressure of 3.5 MPa. Subsequently, the Rectisol process is constructed to furtherly remove and capture the residual CO_(2)remained in light product gas from the VPSA process using cryogenic methanol(233.15 K, 100%(mass)) as absorbent. A final purified gas with CO_(2) concentration lower than 3% and a regenerated CO_(2) product with CO_(2) purity higher than 95% were achieved by using the Rectisol process. Comparisons indicate that the energy consumption is deceased from 2.143 MJ·kg^(-1) of the single Rectisol process to 1.008 MJ·kg^(-1) of the integrated VPSA & Rectisol process, which demonstrated that the deployed VPSA was an energy conservation process for CO_(2) capture from UCG syngas. Additionally, the high-value gas(e.g., CH_(4)) loss can be decreased and the effects of key operating parameters on the process performances were detailed.展开更多
Rectisol process is more efficient in comparison with other physical or chemical absorption methods for gas purification. To implement a real time simulation of Rectisol process, thermodynamic model and simulation str...Rectisol process is more efficient in comparison with other physical or chemical absorption methods for gas purification. To implement a real time simulation of Rectisol process, thermodynamic model and simulation strategy are needed. In this paper, a method of modified statistical associated fluid theory with perturbation theory is used to predict thermodynamic behavior of process. As Rectisol process is a highly heat-integrated process with many loops, a method of equation oriented strategy, sequential quadratic programming, is used as the solver and the process converges perfectly. Then analyses are conducted with this simulator.展开更多
As a non-standard core equipment of the-101℃class rectisol unit,the hydrogen sulfide/carbon dioxide absorber fabricated by the Wuhan Donghai Heavy-duty Petrochemical Equipment Manufacturing Company has
In order to break through the limitations of the traditional hazard and operability(HAZOP)analysis,this study established a gray evaluation model based on gray theory for the riskiness ranking of deviations and semi-q...In order to break through the limitations of the traditional hazard and operability(HAZOP)analysis,this study established a gray evaluation model based on gray theory for the riskiness ranking of deviations and semi-quantitative analysis of risk levels.A quantitative HAZOP analysis combining HAZOP with Aspen Plus,Aspen Dynamics,Fault Tree Analysis(FTA),Risk Matrix and Layer of Protection Analysis(LOPA)was performed for high risk deviations.The dynamic model of the methanol washing unit in the rectisol process was established by Aspen Dynamics and the effects of different deviations on the risk indicators and operability indicators were investigated.Then,the risk of deviations was ranked according to the simulation results and the high-risk deviations were identified.Subsequently,the sensitivity analysis module of Aspen Plus software was used to calculate the fluctuationrange of highrisk deviations,whose results were imported into Aspen Dynamics to simulate and analyze the risk level of accidents,and then FTA was used to quantify the probability of accidents.Synchronizing the two to the risk matrix determined the deviations to have initial risk ratings of 10 and 15,both of which are high-risk deviations.The HAZOP quantitative analysis report is finalizedafter reducing the residual risk level of the deviation to 9(low risk)through LOPA analysis.The results of the case study showed that the method can verify the accuracy of the gray evaluation model to a certain extent,and the quantitative HAZOP analysis report is of guiding significancefor actual production.展开更多
基金financially supported by the Renewable Energy and Hydrogen Projects in National Key Research & Development Program of China (2019YFB1505000)。
文摘An integrated vacuum pressure swing adsorption(VPSA) and Rectisol process is proposed for CO_(2) capture from underground coal gasification(UCG) syngas. A ten-bed VPSA process with silica gel adsorbent is firstly designed to pre-separate and capture 74.57% CO_(2) with a CO_(2) purity of 98.35% from UCG syngas(CH_(4)/CO/CO_(2)/H_(2)/N_(2)= 30.77%/6.15%/44.10%/18.46%/0.52%, mole fraction, from Shaar Lake Mine Field,Xinjiang Province, China) with a feed pressure of 3.5 MPa. Subsequently, the Rectisol process is constructed to furtherly remove and capture the residual CO_(2)remained in light product gas from the VPSA process using cryogenic methanol(233.15 K, 100%(mass)) as absorbent. A final purified gas with CO_(2) concentration lower than 3% and a regenerated CO_(2) product with CO_(2) purity higher than 95% were achieved by using the Rectisol process. Comparisons indicate that the energy consumption is deceased from 2.143 MJ·kg^(-1) of the single Rectisol process to 1.008 MJ·kg^(-1) of the integrated VPSA & Rectisol process, which demonstrated that the deployed VPSA was an energy conservation process for CO_(2) capture from UCG syngas. Additionally, the high-value gas(e.g., CH_(4)) loss can be decreased and the effects of key operating parameters on the process performances were detailed.
基金Supported by the National Basic Research Program of China(2013CB733600)
文摘Rectisol process is more efficient in comparison with other physical or chemical absorption methods for gas purification. To implement a real time simulation of Rectisol process, thermodynamic model and simulation strategy are needed. In this paper, a method of modified statistical associated fluid theory with perturbation theory is used to predict thermodynamic behavior of process. As Rectisol process is a highly heat-integrated process with many loops, a method of equation oriented strategy, sequential quadratic programming, is used as the solver and the process converges perfectly. Then analyses are conducted with this simulator.
文摘As a non-standard core equipment of the-101℃class rectisol unit,the hydrogen sulfide/carbon dioxide absorber fabricated by the Wuhan Donghai Heavy-duty Petrochemical Equipment Manufacturing Company has
基金supported by the National Nature Science Foundation of China(U1710101)the Shanxi Science and Technology Service Co.Ltd.,China.
文摘In order to break through the limitations of the traditional hazard and operability(HAZOP)analysis,this study established a gray evaluation model based on gray theory for the riskiness ranking of deviations and semi-quantitative analysis of risk levels.A quantitative HAZOP analysis combining HAZOP with Aspen Plus,Aspen Dynamics,Fault Tree Analysis(FTA),Risk Matrix and Layer of Protection Analysis(LOPA)was performed for high risk deviations.The dynamic model of the methanol washing unit in the rectisol process was established by Aspen Dynamics and the effects of different deviations on the risk indicators and operability indicators were investigated.Then,the risk of deviations was ranked according to the simulation results and the high-risk deviations were identified.Subsequently,the sensitivity analysis module of Aspen Plus software was used to calculate the fluctuationrange of highrisk deviations,whose results were imported into Aspen Dynamics to simulate and analyze the risk level of accidents,and then FTA was used to quantify the probability of accidents.Synchronizing the two to the risk matrix determined the deviations to have initial risk ratings of 10 and 15,both of which are high-risk deviations.The HAZOP quantitative analysis report is finalizedafter reducing the residual risk level of the deviation to 9(low risk)through LOPA analysis.The results of the case study showed that the method can verify the accuracy of the gray evaluation model to a certain extent,and the quantitative HAZOP analysis report is of guiding significancefor actual production.
