Denitrification device and denitrification process for natural gas

A natural gas and liquefied natural gas technology, which is applied in solidification, lighting and heating equipment, refrigeration and liquefaction, etc., can solve problems such as high nitrogen content, increased power consumption in the liquefaction process, and difficulties in natural gas liquefaction, and achieve low energy consumption and low content Nitrogen amount, waste reduction effect

Active Publication Date: 2014-09-24
天津市振津石油天然气工程有限公司
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Problems solved by technology

However, in natural gas liquefaction plants, some gas sources have high nitrogen content, which makes natural gas liquefaction difficult and increases the power consu

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  • Denitrification device and denitrification process for natural gas
  • Denitrification device and denitrification process for natural gas

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Embodiment Construction

[0013] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] As shown in the drawings, the present invention is a denitrification device for natural gas, including liquid natural gas storage tank, BOG pressurization system, cryogenic system and nitrogen separation system.

[0015] The BOG supercharging system is used to pressurize the BOG to 0.6-1.5Mpa and then cool it to 35-55°C; the BOG supercharging system includes a first BOG compressor, a first BOG heat exchanger, a second BOG compressor and the second BOG heat exchanger; the first BOG compressor and the second BOG compressor can be selected from one of a centrifugal compressor, a reciprocating compressor and a screw compressor, and in this embodiment, the It is a screw compressor; the first BOG heat exchanger and the second BOG heat exchanger can be finned heat exchangers or shell-and-tube heat exchangers...

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Abstract

The invention discloses a process for removing nitrogen in natural gas. The process comprises the following steps: reheating BOG (boil off gas) in an LNG (liquefied natural gas) storage tank through a BOG cold box, feeding the BOG into a BOG supercharging system, supercharging the BOG to 0.6Mpa to 1.5Mpa; cooling the BOG to liquid at the temperature of minus 154 DEG C to minus 165DEG C after sequentially passing through the BOG cold box and a liquefying cold box, further cooling the BOG to minus 168DEG C to minus 176DEG C in a denitrification heat exchanger, cooling the BOG to the minus 178DEG C to minus 185DEG C after being throttled and expanded, discharging the nitrogen gas separated from the nitrogen removal device, and recycling the purified natural gas by utilizing the LNG storage tank. The nitrogen is removed after the BOG in the LNG storage tank is further cooled, the process is mature, the applicability is strong, the denitrification device and the denitrification process are particularly applicable to the working condition with high nitrogen content and large fluctuation range of the raw gas, the exhausted natural gas of the LNG storage tank can be partially recycled, and the storage safety of the storage tank can be improved.

Description

technical field [0001] The invention relates to a natural gas denitrification process and device. Background technique [0002] With the increasing awareness of the application of clean energy, the development and application of natural gas is becoming more and more common. Because liquefied natural gas (LNG) is easy to store and transport, it is widely used in peak shaving stations, buses, heavy trucks and ships. However, in natural gas liquefaction plants, some gas sources have high nitrogen content, which makes natural gas liquefaction difficult and increases the power consumption of the liquefaction process; moreover, the high nitrogen content in liquefied natural gas products brings safety hazards to the storage of liquefied natural gas. Therefore, it is of great practical significance to remove nitrogen from natural gas and ensure that the nitrogen content of natural gas entering the LNG storage tank meets the requirements. Contents of the invention [0003] The pu...

Claims

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Application Information

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IPC IPC(8): F25J3/00
CPCF25J3/0209F25J3/0233F25J3/0257F25J2200/02F25J2200/70F25J2210/90F25J2230/30F25J2215/04F25J2200/40F25J2270/90F25J2290/72
Inventor 李贺松董宪莹王月娥宋美萱胡家乐孔玉倩高杨
Owner 天津市振津石油天然气工程有限公司
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