某天然气脱硫装置适应性分析与动态特性研究

发布时间：2018-05-04 07:13

本文选题：天然气脱硫 + 适应性　；参考：《西南石油大学》2015年硕士论文

【摘要】：由于原料气配气方案制度改变、环境温度变化等原因,在实际运行中,某天然气脱硫装置经常受到原料气流量、原料气酸性组分含量和贫液入塔温度等因素的干扰。为保证装置平稳运行,基于化工稳态和动态模拟技术对装置的适应性和动态特性进行研究,以期为装置的实际操作提供支撑。基于HYSYS建立脱硫装置稳态模型,通过对比模拟数据与实际数据以验证所建模型的正确性。依据参数控制的难易程度,将装置参数分为可控制参数与不可控参数两类。通过对可控参数进行单因素分析及灵敏度分析,探究各可控参数对天然气净化质量、富液酸气负荷和装置能耗的影响情况并确定各参数对考察指标影响的强弱程度。通过对不可控变量进行响应面回归,得到原料气流量、原料气中H2S含量、原料气中CO2含量和贫液温度与所需贫液流量和能耗的定量关系。在此基础上对不可控变量进行多因素交互作用分析,结果表明：原料气流量和贫液入塔温度间交互作用、原料气中H2S含量和原料气中CO2含量间交互作用对装置能耗和循环量的影响可忽略,而其它因素间则存在显著交互作用。在稳态模型分析的基础上,增加装置的设备和控制方案来建立装置动态模型。以原料气流量、原料气中H2S含量、贫液温度和贫液循环量为扰动量,对装置进行正、反向等幅度扰动以研究装置的动态特性。由于贫液循环量不会随干扰而自动调整,面对干扰时富液酸气负荷会出现较大幅度变化,而再生塔塔底能耗则基本不随干扰变化。为提高装置应对干扰的自适应性,结合稳态分析结果提出比例和回归两种改进的控制方案。研究结果表明：比例控制方案中贫液循环量可随原料气流量变化而进行自动调整；回归控制中贫液循环量可随多个干扰变量而调整,进而实现对装置的卡边、自适应控制。
[Abstract]:Because of the change of the scheme of raw gas distribution and the change of ambient temperature, the desulfurization device is often disturbed by the flow rate of raw gas, the content of acid component of raw gas and the temperature of lean liquid entering tower. In order to ensure the smooth operation of the plant, the adaptability and dynamic characteristics of the plant are studied based on the steady state and dynamic simulation technology of chemical industry, in order to provide support for the practical operation of the plant. The steady-state model of desulphurization device is established based on HYSYS, and the correctness of the model is verified by comparing the simulated data with the actual data. According to the degree of difficulty in parameter control, the device parameters are divided into controllable parameters and uncontrollable parameters. Through single factor analysis and sensitivity analysis of controllable parameters, the influence of controllable parameters on natural gas purification quality, liquid rich acid gas load and unit energy consumption is explored, and the degree of influence of each parameter on the investigation index is determined. Through the response surface regression of uncontrollable variables, the quantitative relationships between the flow rate of raw gas, the content of H _ 2S in raw gas, the content of CO2 in raw gas and the temperature of lean liquid were obtained. On the basis of this, the interaction analysis of the uncontrollable variables is carried out. The results show that the interaction between the flow rate of raw gas and the temperature of lean liquid entering tower, The interaction between H _ 2S content in feedstock gas and CO2 content in feedstock gas can be neglected, but there is significant interaction among other factors. On the basis of steady-state model analysis, the device dynamic model is established by adding equipment and control scheme. Taking the flow rate of raw gas, the content of H _ 2S in raw gas, the temperature of lean liquid and the amount of circulation of lean liquid as disturbance quantity, the dynamic characteristics of the device were studied by the constant amplitude disturbance of positive and reverse amplitude. Because the lean liquid circulation will not be adjusted automatically with the interference, the liquid rich acid gas load will change greatly in the face of the interference, while the energy consumption at the bottom of the regeneration tower will not change with the interference basically. In order to improve the adaptability of the device to interference, two improved control schemes, proportion and regression, were proposed in combination with the results of steady-state analysis. The results show that the lean liquid circulation can be adjusted automatically with the flow rate of raw gas in the proportional control scheme, and the poor liquid circulation can be adjusted with multiple disturbance variables in the regression control, thus realizing the self-adaptive control of the clamped edge of the device.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE96

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