Method of and device for storing natural gas

FIELD: gas industry.

SUBSTANCE: invention relates to method of storing natural gas for satisfying peak requirements. According to invention, hermetic sleeve, diameter 10-12 m and 400-600 m long, is made of sheet reinforced polyethylene, thickness 0.3-0.5 mm. High-pressure reinforced hose is fitted at one end of sleeve. Flattened sleeve is lowered to bottom of sea or lake to depth of 2-4 km, with laying of high-pressure hose along bottom to beach or floating station. Sleeve is covered by rope net, and granite stones are placed at sides to equalize buoyancy force. Gas under pressure of 200-400 atm is pumped into sleeve to turn it into cylindrical reservoir-storage, capacity of -60 thousand cubic meters. Reservoir is enclosed by rope net to prevent floating up. Gas is consumed from storage by natural forcing by bottom pressure of water. Proposed device for storing natural gas consists of compressing and transfer station, high-pressure pipeline, elastic reservoir, rope net and granite ballast. Compressing station is installed on the beach or afloat on sea or lake surface and is connected at bottom by high-pressure pipeline with elastic storage-reservoir enclosed by rope net and arranged at depth of 2-4 km.

EFFECT: possibility of storing gas compressed to 400 atm in modular thin walled reservoirs.

3 cl, 1 dwg

 

The invention relates to the gas industry, in particular to a technique of storing natural gas to meet peak gas demand.

Peak demand, for example, in Russia 60-70 billion m3in year. The provision of such needs a sharp increase in gas production is associated with great difficulties connected with the power increase of gas and gas equipment.

However, in the summer months when gas consumption is reduced, it would be part of the production injecting it into underground gas storages (UGS). The way it is done.

Today in Russia from underground gas storages uses about 30% of the total produced gas. All it says about the necessity to develop the technique of storing natural gas.

Peak demand gas fuel occur for the following reasons:

- the seasonal fluctuations in gas consumption;

- abnormally cold winters;

- emergency on gas pipelines;

- ensuring the reliability of export deliveries;

the delay in commissioning of new facilities.

There are three ways of storing gas:

1. Storage in a compressed state

in high-pressure cylinders (up to 250 ATM).

Disadvantage: for large storage impractical because of the complexity, bulkiness and explosion hazard.

b) storage (aquifer structures in depleted gas is gas condensate fields, in salt caverns in porous Sandstone layers).

Disadvantages:

- the complexity of the equipment wellhead piping;

- diffusive gas loss;

- violation of water-salt metabolism in groundwater;

the necessity of drilling multiple wells for uniform pumping the gas.

2. Storing in a liquefied state in cryogenic tanks.

Disadvantages:

- the need to maintain the temperature at - 82°C and a pressure of about 50 atmospheres;

high cost and complexity of refrigeration units.

3. Storage in the adsorbed state.

This kind of gas storage developed in recent years based on the use of solid sorbents: intermetallic compounds, activated carbon, titanium dioxide and other

Disadvantage: very low dynamic capacity in relation to methane (not more than 2.5% of the mass).

The objective of the invention is to find a way to hold compressed to 400 ATM of natural gas in modular thin-walled vessels with a volume of several tens of thousands of cubic meters.

The problem is solved by creating a deep underwater storage of natural gas, in which the differential pressure between the gas and the environmental store water is close to zero, and the Archimedes force is balanced by a corresponding ballast.

This is the technical result of the invention. The prototype was not found, therefore the application is executed as inersha the invention.

The essence of the method lies in the fact that I'm thin (0.3 to 0.5 mm) sheet reinforced high-pressure polyethylene and are made from it tight "stocking" with a diameter of 10-20 metres and a length of 400 to 600 meters, at one end which establish the reinforced high pressure hose length of several tens of kilometers, omit this "flattened" stocking at the bottom of the sea or lake to 2-4 km. Paving the high pressure hose on the bottom to the shore or floating station compression or pumping gas, a stocking" rope mesh, and laterally occiput granite stones in the amount necessary to balance Archimedean force eject "stocking" on the surface of the waters; inject gas under pressure of 200-400 psi "stocking", turning it into a cylindrical container storage volume 30-60 thousand cubic meters, while framed by the capacity of the wire mesh holding capacity from surfacing; consume gas from such store by his natural expression on the surface of the bottom pressure of the water.

Diagram of the device for implementing the method of storing natural gas shown in the drawing.

The gas storage device consists of the following elements: 1 - station compression and pumping, 2 - high pressure pipeline, 3 - elastic thin-walled tank, 4 - rope is the first grid, 5 - granite ballast, the station compression and pumping installed on shore or afloat a sea or lake 6 and is connected by high pressure pipeline laid on the seabed, located at a depth of 2-4 thousand meters elastic capacity-store, framed wire mesh, having the ability to prevent the ascent of storage tanks under the action of the Archimedean force.

The device operates as follows.

Using station 1 inject natural gas into the elastic capacity of the storage 3 to the pressure of 200-400 MPa, while the flattened first capacitance takes the form of a cylinder with a volume of several tens of thousands of cubic meters and is based on the top rope mesh 4, the holding tank 3 from surfacing. When the gas consumption from the store it under natural bottom pressure of 200-400 MPa is supplied by pipeline 2 to the station 1, and further through the pipeline to the consumer.

Example (current)

Take made of elastic capacity with a diameter of 10 meters and a length of 400 meters, put it on the bottom of the deep (4 km) water area and fill it with natural gas up to a pressure of 400 atmospheres, the pressure inside the vessel is equal to pressure outside. When straightening capacity takes the form of a cylinder 32000 m3and leans on the rope wall 4.

The specific gravity of methane at a pressure of 400 ATM is 304 kg/m3and eat the awn will contain 32000· 304=9728000 kg ˜9730 tons of methane. The specific gravity of methane at normal pressure equal 0,717 kg/m3thus, the stored gas reserve will be 9728000:0,717=13567642 m3or about 14 million m3.

Wire mesh holding capacity storage from surfacing under the action of the Archimedean force equal to 32 thousand tons. Such strength withstands wire mesh, consisting of 3200 transverse with respect to capacity-storage steel cables with a diameter of 10 mm each, the distance between which is 0.25 m, the Longitudinal components of the wire mesh are made from a synthetic tape. The total mass of granite stones should be 40,000 tons.

Store maintenance at depth and provides the expenditure of gas without the use of compressor stations, so that the pressure gas supply constantly and 400 ATM that allows the use of small diameter hoses.

It is of interest to use such storage subsea natural gas.

1. The method of storing natural gas in an underwater storage is that you take reinforced polyethylene sheet thickness of 0.3-0.5 mm and made of him a sealed "stocking" with a diameter of 10-12 m and a length of 400-600 m, at one end which establish the reinforced high pressure hose, lower oblate stocking on the bottom Morari lake to 2-4 km, paving the high pressure hose on the bottom to the shore or floating station, served "stocking" rope mesh, and laterally occiput granite stones in the amount necessary to balance Archimedean force eject "stocking" on the water surface; they fill in the "stocking" gas under pressure of 200-400 MPa., turning it into a cylindrical container storage volume 30-60 thousand cubic meters, while framed by the capacity of the wire mesh holding capacity from surfacing; consume gas from such store by his natural expression on the surface of the bottom pressure of the water.

2. Device for storage of natural gas, consisting of station compression and pumping, high pressure pipeline, elastic capacity, wire mesh and granite ballast, the station compression set ashore or afloat a sea or lake and is connected on the bottom of the high pressure pipeline located at a depth of 2-4 thousand meters elastic capacity-store, framed wire mesh, having the ability to prevent the ascent of storage tanks under the action of the Archimedean force.



 

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