Method of using reserve underground storage for liquefied natural gas

FIELD: storing or distributing of gas or liquids.

SUBSTANCE: method comprises filling the underground storage with liquefied natural gas, storing the gas, and supplying the gas to the consumer maintaining an excess pressure inside the storage. The reserve underground storage is positioned in the vicinity of the consumer. The gas evaporated from the storage is directed to the consumer through an additional gasifier.

EFFECT: reduced heat influx to the storage.

1 cl, 1 dwg

 

The invention relates to methods of underground reserve of liquefied natural gas (LNG), namely economical, fire - proof underground vaults (HRP), and can be used for accumulation and storage (issues) of LNG when interruptions in the supply of natural gas (GHG) emissions or interruptions in the delivery (transport) of LNG.

The relevance of this problem is proved by disruptions in the supply network gas, which occur more often because of failure of the piping is worn out.

The prototype of the claimed invention is a method of using the underground storage of liquefied natural gas (HRP LNG), implemented in the device [1] - RF Patent №2232342, IPC7F17 1/00, 65G 5/00, 10.07.2004,, bull. No. 19.

The way to use HRP LNG [1] consists in lling the HRP liquefied natural gas, storage and delivery of LNG to the surface of the consumer pumping method, while maintaining at PH continuous excess pressure PG.

With all the advantages of use [1], namely

excluded from direct contact HRP LNG from the atmosphere than cause a permanent reduction of loss of LNG from evaporation;

- full depth HRP LNG achieve a high degree of fire and explosion in operating conditions and in case of accidents and various man-made in the action;

- deep depth HRP LNG achieve environmental security in the long term storage of LNG and storage operation, so as not to allow the output of the zero-degree isotherm at the surface of the earth,

at the same time, when the storage of LNG, as with all stores, HRP also the evaporation of the cryogenic liquid, and this, in turn, is unacceptable in the long term storage.

This disadvantage makes the task of the standing losses of the stored liquefied natural gas from the heat leakage from the environment.

This task is achieved by the fact that in the known method [1] using HRP LNG, consisting in filling the underground storage LNG storage and delivery of LNG to the surface of the consumer (for example, a pumping method), while maintaining at PH continuous excess pressure PG, backup HRP LNG feature near (near) consumer GHG with your feed store LNG and use issued consumable store LNG to replenish evaporated in underground storage LNG, and evaporated in HRP natural gas is sent through additional regasification consumer GHGs, and in the issuance of LNG to the regasification use regasification disabled in this time, consumable stores LNG, while maintaining the guaranteed excess pressure PG in the back of HRP implementation is proven through additional regasification.

The implementation of how to use the backup underground storage of liquefied natural gas in conjunction with the above characteristics (restrictive and distinctive features in the claims) is new for underground LNG storage and, therefore, meets the criterion of "novelty."

The above set of distinctive features is unknown at this level of technology and does not follow from well-known design rules LNG storage and accessories, which proves the compliance with the criterion of "inventive step".

Construction of LNG storage with the specified set of essential features not present any constructive technical and technological difficulties, whence it follows that the criterion of "industrial applicability".

Diagram illustrating the essence of the proposed method, shown in the drawing device that implements the method.

The drawing shows located on the surface of the ground 1 ground supplies store LNG and away back HRP LNG 3 with a cryogenic liquid and gas pipes 3 arranged in the processing shaft with a ladder and sealed the hatches. The output of gate filling-issue 5 LNG supplies store 2 is connected to a cryogenic pipeline szapary valve 6 (entrance LNG evaporator 7) and valve filling-issue 8 LNG underground storage. Gas pipeline HRP LNG 3 via the auxiliary regenerator 9 is connected to the gas distribution points (GCP) 10 user (for example, a gas boiler or gas-fired power plant with heat recovery in heating system and hot water). The output of the regenerator 7 is also connected to hydraulic fracturing 10 user 11.

Work on the proposed way of using backup HRP LNG is in the following 3 modes.

1. When working consumer 11 LNG supplies store 2

LNG from feed store 2 through the valve 5 and the valve 6 is sent to the regasification 7, in which it evaporates, is heated almost to ambient temperature, then the natural gas is sent to hydraulic fracturing 10 user 11. When this valve 8 HRP LNG 3 is closed, and evaporated in HRP LNG 3 couples go through additional regasification 9 and it also comes in hydraulic fracturing 10 user 11. The pressure in the steam region HRP LNG 3 will be equal to the pressure after the evaporator 7, the maintenance of this pressure exercised by the reverse flow of gas through the additional regasification 9.

2. When working consumer 11 LNG supplies store 2 with the addition of LNG backup HRP LNG 3

In this mode, the valve 6 is closed, and LNG from feed store 2 via open valves 5 and 8 are directed to HRP LNG 3, replenishing his supply of cryogenic liquid. P and this pair of LNG through additional regasification 9, in which they are heated almost to ambient temperature, and come join 10 user 11.

3. When working consumer 11 LNG backup HRP LNG 3

In this mode, the valve 5 supplies store 2 is closed, and LNG from an underground storage 3 is directed through open valve 8 and 6 in regasification 7, from which it is evaporated and heated gas is directed to hydraulic fracturing 10 user 11. While the supercharged HRP LNG 3 carry out a reverse flow of gas through the additional regasification 9 to a pressure equal to the pressure before fracturing 10.

Thus, implementation of the proposed method allows us to constantly enrich HRP LNG supply cryogenic fluid along with the work of consumer expenditure from the storage of LNG. And at the same time allows for the interruption of supply (delivery) of LNG to the consumer (or many people) to work on a backup natural gas from HRP LNG.

Compared with the use of terrestrial storage of LNG use the backup HRP LNG allows

- protection against fire and explosion HRP LNG;

- ensuring a constantly declining (retention time) of heat leakage to HRP LNG and more efficient storage.

The application of the proposed method using backup HRP LNG allows you to store LNG any time (long term storage) and provides payment is the situation of loss of the stored liquefied natural gas with decreasing time losses LNG to evaporation.

1. Way to use the backup underground storage of liquefied natural gas, which consists in filling the underground storage of liquefied natural gas, storage and delivery to the surface to the consumer, while maintaining underground storage guaranteed natural gas excess pressure, characterized in that the backup underground storage of liquefied natural gas have near consumers of natural gas with its consumable storage of liquefied natural gas and use issued consumable store liquefied natural gas to replenish evaporated in back underground storage of liquefied natural gas, and evaporated in underground backup natural gas is sent through additional regasification consumer of natural gas.

2. Way to use the backup underground storage of liquefied natural gas according to claim 1, characterized in that when the issue of liquefied natural gas to the consumer for its regasification use regasification disabled at this time supplies store liquefied natural gas, and maintaining the guaranteed excess pressure natural gas backup underground storage carry through additional regasification.



 

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