Hypergravity-process triglycol natural gas dehydration system and process using system

Abstract

The invention discloses a hypergravity-process triglycol natural gas dehydration system which is characterized in that the outlet of a filtering separator is connected with the side inlet of a first hypergravity machine; the upper outlet of the first hypergravity machine is connected with the inlet of a gas-liquid separator; the lower outlet of the hypergravity machine is connected with the inlet of a heat exchanger; the outlet of the heat exchanger is connected with the inlet of a buffer tank; the outlet of the buffer tank is connected with the upper inlet of a second hypergravity machine; the upper outlet of the second hypergravity machine is connected with the inlet of a flash evaporation tank; the outlet of the flash evaporation tank is connected with the inlet of a pump; the outlet of the pump is connected with the upper inlet of the first hypergravity machine. According to the system, the characteristics of the enhanced absorption reactions of the hypergravity machines are utilized and high efficiency of triglycol is combined; the system has the advantages of simple equipment structure, small occupied area, easiness for dehydration, good operating flexibility, high efficiency and the like, and is a novel technology for removing the moisture in natural gas of an offshore platform.

Description

technical field [0001] The invention relates to the technical field of petroleum gas treatment and processing. More specifically, it relates to a high-gravity triethylene glycol natural gas dehydration system and its technology. Background technique [0002] Natural gas usually contains water vapor when it leaves the reservoir. Water vapor easily forms hydrates when the pressure and temperature of natural gas change. The local accumulation of hydrates will limit the flow rate of natural gas in the pipeline, increase the pressure drop of the pipeline, and reduce the gas transmission volume. In severe cases, the pipeline will be blocked and the gas transmission will be interrupted. At the same time, the moisture in natural gas is also the main factor causing corrosion and damage to equipment, instruments and pipelines. The existence of water may cause hydrates to freeze and block when the temperature is low, making traces of water become ice particles and damage or breakdown ...

AI Technical Summary

Problems solved by technology

1. Due to the large fluctuations in offshore natural gas production, there is a large loss of triethylene glycol, and the dew point of water treatment is high; 2. The dehydration balance of the tower equipment is low, and it is difficult to meet the dew point requirements of the outlet gas; 3. The dehydration of the tower equipment triethylene glycol The system is relatively complicated; 4. The energy consumption of the regeneration process of triethylene glycol solution is relatively large; 5. The tower equipment occupies a large area, has low mass transfer efficiency and limited processing capacity, and its use on offshore platforms has great limitations. The large volume will increase the platform area, which will directly lead to a substantial increase in investment

[0004] At present, the published patented process of natural gas dehydration is difficult to solve the above-mentioned related problems

The oilfield natural gas dehydration device disclosed in Chinese patent 201210188626.0 adopts the adsorption tower process, which occupies a large area, has high equipment height, and low dehydration efficiency, so it is difficult to apply to offshore platforms

The natural gas supergravity dehydration device disclosed in Chinese patents 201010013703.X and 201020019690.2 uses multiple supergravity separation tubes to connect two buffer tanks stacked up and down, and can remove liquid droplets with a radius of 10 μm. However, this equipment requires natural gas to pass through multiple times. The separation tube is separated, the pressure drop is large, and the working efficiency of the equipment is not high. In addition, the two buffer tanks occupy a large area, and the internal pressure is unstable and prone to danger.

Chinese patent 201010519341.1 discloses a purification gas dehydration process applied to high-sulfur natural gas, which uses tower equipment, which occupies a large area, and it is difficult to meet the equipment size requirements of offshore platforms

200710101510.8 discloses a natural gas supersonic dehydration method, which uses the energy of natural gas itself for heat exchange dehydration, does not require external energy power, and saves energy consumption. However, it needs to go through five steps of dehydration, and the process is relatively complicated and occupies a large area , not suitable for use on offshore platforms

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