Research Of The TEG Dehydration System Of XX Underground Gas Storage

The TEG dehydration system of xx underground gas storage encountered a series of problems in the process of production and operation, which not only increases the operation maintenance cost of underground gas storage, but also has a certain influence on the normal production and operation. In addition, the gas storage TEG dehydration device, in actual operation consumes a lot of energy, which not only resulted in the waste of energy resources,but also increase the economic burden of enterprises.In view of these questions, this topic has carried on the research from the following three aspects:(1) For the block problem of TEG dehydration system in the operation, the paper uses HYSYS software to establish a simplified model. This paper analyses the reason of the clogging of the dewatering device. To solve the problem of clogging, the methods are recommended to solve the problem of temperature increasing, pressure boosting, adding inhibitor and non destructive thawing. The temperature is too high for the poor TEG in the operation of the dehydration unit, which can be used to replace the heat exchanger or increase the heat dissipation system. By heat exchanger simulation software, it is suggested that the shell and tube heat exchanger replacement for plate heat exchanger, or in the absorption tower TEG into the tower pipeline is additionally arranged on the air cooler. The waste can not be recycled through the sewage system to carry out, and additional sewage tank is proposed. The solution to these problems is to ensure the safe operation of the dehydration system.(2)According to the operation data of the field dehydration device, the process model of xx underground gas storage TEG dehydration system is established with HYSYS software. This paper analyses the influence of main parameters on the dehydration effect. Results show that the amount of poor glycol is increased, and the effect of dehydration is weakened. The increase in temperature will reduce the effect of TEG dehydration. This paper analyses the effects of main operating parameters on TEG regeneration. Results show that the increase of the temperature of the mouth rich glycol will reduce the regeneration effect, but the change is small. The temperature and pressure of alcohol and fuel gas have little effect on the dewatering effect. This paper analyses the effect of main parameters on TEG regeneration.The higher the temperature of the heavy boiler is, the greater the regeneration concentration of three glycol is. The increase of fuel gas consumption will promote the regeneration of TEG,and it will almost no longer affect the regeneration effect when it is increased to a certainvalue. The pressure of the heavy boiler is increased, the regeneration effect is poor.(3) For the model of HYSYS software, it is select the important parameters related to energy consumption of dehydration unit, TEG circulation, reboiler temperature and steam provided the amount of gas, to establish an optimal energy consumption objective function with constraint conditions. Using the software HYSYS Optimizer Option optimizer to optimize. The optimized parameters in the products meet the requirements of the water dew point of natural gas, and it greatly reduces the energy consumption of TEG dehydration unit.These measures save the cost of production and operation, and create a good economic and social benefit.