Integrated TEG (triethylene glycol) dehydration integrated process device and method

Abstract

The invention discloses an integrated TEG (triethylene glycol) dehydration integrated process device and method. The device comprises a feed gas filtration separator, a TEG (triethylene glycol) absorption tower and a dry gas / barren solution heat exchanger; a liquid phase outlet at the bottom of the TEG (triethylene glycol) absorption tower is connected to a TEG (triethylene glycol) circulating pump; a pregnant solution outlet of the TEG (triethylene glycol) circulating pump is sequentially connected to a pregnant solution heat exchange coil, a flash tank, a TEG (triethylene glycol) solution filter and a barren / pregnant solution heat exchanger, a barren solution buffer tank and a pregnant solution rectifying column; a flashing steam outlet of the flash tank is connected to a TEG (triethylene glycol) fire tube type reboiler; the pregnant solution rectifying column, the fire tube type reboiler, a barren solution rectifying column and the barren solution buffer tank are connected together;and an outlet of the barren solution buffer tank, the barren / pregnant solution heat exchanger, the TEG (triethylene glycol) circulating pump, a dry gas / barren solution heat exchanger shell pass and aliquid phase inlet at the tower top of the TEG (triethylene glycol) absorption tower are sequentially connected. According to the integrated TEG (triethylene glycol) dehydration integrated process device and method, the process is simpler, highly integrated design is better facilitated, moving is easy, in addition, energy conservation and emission reduction are realized to a great extent, the operation cost is lowered, and the one-time investment is reduced.

Description

technical field [0001] The invention relates to a novel, high-efficiency and energy-saving integrated TEG dehydration integration process, which belongs to the technical field of dehydration processes in the fields of natural gas treatment plants, natural gas single well test production, shale gas dehydration stations and the like. Background technique [0002] TEG dehydration is based on the principle of absorption, using a hydrophilic liquid in countercurrent contact with natural gas to remove water vapor in the gas. For glycol dehydration, due to the large dew point drop, low cost and reliable operation of triethylene glycol dehydration, its economic benefits are the best among various glycol compounds. Therefore, it is widely used abroad. When both dehydration with triethylene glycol and solid adsorbent dehydration can meet the dew point drop requirements, the economic benefit of dehydration with triethylene glycol is better. Compared with adsorption dehydration, glyco...

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Problems solved by technology

[0003] ① It needs to be regenerated by stripping, and the regenerated stripping gas will be incinerated and discharged, which will cause energy waste on the one hand, and cause a certain degree of pollution to the environment on the other hand;

[0004] ②The process flow is complicated, there are many equipments, and the degree of device integration is not high;

[0005] ③The traditional waste liquid recovery process is carried out by gravity, and the recovery tank is arranged below the ground, which is not easy to pry and relocate;

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