Optimized design of TEG dehydration from coal bed gas

At present, the method for dehydration of coal bed gas in China mainly refers to the dehydration treatment method for low-pressure gas field, which has the problems of high engineering investment and energy consumption in the process. The low yield of coal bed gas determines that the emphases for gathering and transportation of coal bed gas are saving investment and improving adaptability. By analyzing the problems of existing coal bed gas dehydration process, it was found that the mainly problems were the poor use effect of filter separator, glycol pumps and buffer tank, together with the bad heat transfer effect of the poor and rich glycol heat exchanger. Measures of the process and equipment were put forward to improve the dehydration efficiency, reduce investment, improve technological adaptability, and save energy. Finally, taking the gas of Qinshui Shanxi coal bed gas field as an example, comparing the traditional design with the optimized design by HYSYS software, the simulation results showed that the optimized design could effectively reduce comprehensive energy consumption of about 65% relative to traditional design. Therefore it has high dehydration efficiency, strong adaptability, low investment and low energy consumption.