A denitrification device for natural gas and its denitrification process
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, so as to reduce nitrogen content and reduce Effect of waste and low energy consumption
Active Publication Date: 2016-05-11
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 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
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[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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The invention discloses a process for removing nitrogen in natural gas, which comprises the following steps: BOG gas in an LNG storage tank is reheated by a BOG cold box and then enters a BOG pressurization system to be pressurized to 0.6-1.5Mpa; After passing through the BOG cold box and the liquefaction cold box, the BOG is cooled to a liquid state of -154°C~-165°C, and then enters the denitrification heat exchanger to be further cooled to -168~-176°C, and then the temperature drops to -178~-185°C, the nitrogen separated from the nitrogen removal equipment is vented at a high point, and the purified natural gas is recovered to the LNG storage tank. The present invention removes nitrogen by deep cooling the BOG in the LNG storage tank, has mature technology and strong adaptability, is especially suitable for working conditions where the nitrogen content in the raw material gas is high and the fluctuation range is relatively large, and can partially recover the emptied LNG storage tank natural gas while improving the safety of tank storage.
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...
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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