A method for calculating bog storage and generation in LNG storage tank
A storage tank and inventory technology, which is applied in the field of calculating BOG inventory and production in LNG storage tanks, can solve problems such as constraints on BOG monitoring, and achieve the effect of reducing operating costs, reducing costs, and improving safety performance
Active Publication Date: 2020-07-28
深圳市中燃科技有限公司
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Problems solved by technology
However, the existing storage tank station control system restricts the monitoring of BOG. In view of this problem, the present invention studies a method for calculating the BOG stock and production rate in the LNG storage tank through the existing monitoring data.
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[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0038] Such as figure 1 , the embodiment of the present invention provides a method for calculating the BOG stock and production in an LNG storage tank, which includes five steps (a), (b), (c), (d), and (e). For details, please refer to the following description .
[0039] (a) Station control data at sampling time t: real-time gas phase space temperature T BOG , storage tank pressure P, storage tank liquid level L, and calculate the critical pressure P accor...
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The invention provides a method for calculating stock and output of BOG in an LNG storage tank. The method comprises the following steps of: sampling station control data at a moment of a time t: real-time gas-phase space temperature TBOG, a storage tank pressure P and a storage tank liquid level L; (1) calculating a critical pressure Pc and a critical temperature Tc according to volume of each component of natural gas in the storage tank; (2) calculating a comparison pressure Pr and a comparison temperature Tr; (3) calculating a compression factor Z; (4) calculating a BOG water capacity; (5) calculating a real-time volume VBOG of the BOG under a standard state, so as to solve a stock VN of the BOG in the LNG storage tank; and (6) carrying out linear fitting on the time t and VBOG and calculating a real-time generation speed of the BOG. According to the method provided by the invention, the state of the BOG in the storage tank is monitored, the real-time stock and generation speed of the BOG are calculated and data can be provided for the production and operation, so that data support is provided for reducing the operation cost and avoiding the safety accidents, the safety performance is improved and the cost is reduced.
Description
technical field [0001] The invention relates to a method for calculating BOG storage and production in an LNG storage tank. Background technique [0002] LNG (Liquefied Natural Gas) is a natural gas that is transported and stored in liquid form after being pretreated at room temperature to remove impurities such as heavy hydrocarbons, sulfides, carbon dioxide and water, and then cryogenically cooled to -162°C. Its main component is methane accounting for 70%-95% of the molar volume, and the rest is ethane, propane, butane and a small amount of nitrogen, carbon dioxide, hydrogen sulfide, etc. It is a colorless, odorless, non-toxic liquid with a high ignition point (close to 600 ° C), slow burning speed, non-corrosiveness, and a specific gravity less than 1 / 2 of water. [0003] Liquefied natural gas (LNG) storage tanks are essential storage equipment for the transportation and storage of liquefied natural gas. LNG storage tanks store natural gas at atmospheric pressure and l...
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IPC IPC(8): G06F17/10G07C3/00G07C3/08
CPCG07C3/005G07C3/08G16Z99/00
Inventor 王炳淇解东来
Owner 深圳市中燃科技有限公司