Research On The Response Characteristics Of Natural Gas Decarbonization Unit Under Multiple Operating Conditions

Amine decarburization is one of the most commonly used methods in natural gas decarburization processes,and the stability of its process system operation has always received strong attention.In actual production and operation,the natural gas decarbonization device is often subject to various disturbances,in which the quality of the feed gas is fluctuating for a long time due to the influence of the gas field itself and the transportation environment,which is directly related to the smooth operation of the natural gas decarbonization device and the environmental economy It is closely related to whether the device can operate stably and whether its response action under various working conditions is timely and effective.Therefore,it is particularly important to study the response characteristics of the device under various working conditions.Based on the actual operation of the natural gas decarbonization cycle experimental device built in the laboratory,this paper conducts an optimization study,and uses a combination of experiment and dynamic simulation to explore the response characteristics of the device under under multiple operating conditions from two directions:start-up conditions and sudden changes in operating conditions.Analyze the key influencing factors,and give optimization and improvement from the perspective of the control plan,the main work and conclusions are as follows:Through the single-factor experimental study,the response characteristics of different start-up conditions to the temperature and liquid level of the decarburization device under the single factor were analyzed.It was found that the response characteristics under different start-up conditions,especially the response time of the liquid level in the absorption tower kettle,were different.The RSM analysis method was used to analyze the multi-factor coupling effect.It was found that the influence of various factors on the response characteristics was not simple monotonic,and the interaction between the absorption pressure and the temperature of lean liquid entering the tower had a more significant effect on the target value.Based on the actual operation data,the HYSYS steady-state model of the natural gas decarbonization cycle experimental device was established.On this basis,the corresponding HYSYS dynamic model was established according to the device control scheme and equipment size.The response characteristics of the decarbonization system to different disturbances were studied when the natural gas decarbonization system encountered sudden fluctuations in the flow rate of raw gas,inlet pressure,flow rate of lean liquid into the tower and inlet temperature of the tower.The changes of CO₂ content of purified gas,the top pressure of the absorption tower,the temperature of the absorption tower kettle,the liquid level of the absorption tower kettle and the load of rich liquid acid gas with time under various sudden changes were analyzed,and the response characteristics of the device under the current control scheme were analyzed.In view of the response delay problem of the original control scheme,the theoretical basis for optimization and improvement is obtained after dynamic simulation under multi-factor coupling conditions.The response characteristics of the optimized control scheme are simulated under the most significant working conditions,and the response evaluation system of natural gas decarburization device is established,which provides theoretical guidance for the efficient and stable operation of natural gas decarburization device.