RU2657373C2 - Method of preserving natural gas by preventing its emissions into atmosphere during repair of gas pipelines - Google Patents

Abstract

FIELD: gas production industry.

SUBSTANCE: invention relates to gas industry and can be used in repair of gas pipelines in order to maintain and further use natural gas contained therein. Object of the present invention is to provide an device for conserving natural gas by preventing its emission into the atmosphere during the repair of gas pipelines, in which gas from the area to be repaired is directed to the working section of the gas pipeline and then to the consumer with minimal losses. Task is solved by constructing a technological scheme, providing gas to the consumer up to pressure 1…1.2 MPa and injection of water under pressure into the gas pipeline section to be repaired in order to increase the gas pressure in the pipeline to the value, allowing to deliver residual gas to the consumer. Device for preserving natural gas by preventing its emissions in atmosphere when repairing gas pipelines includes the repaired section of the gas pipeline, limited by crane units, gas pipeline-tap to the consumer. It is proposed to supplement the existing technological scheme with an installation for supplying water under pressure to the gas pipeline section to be repaired in order to increase the gas pressure in it and further develop it to the consumer, installation for drying the gas supplied to the consumer, a storage barn for storage of water, as well as an installation for its purification.

EFFECT: proposed invention allows to save not less than 75 % of the fuel, and also to exclude the harm to the environment that occurs when the gas is released into the atmosphere or when it is burned.

1 cl, 1 dwg

Description

The invention relates to the gas industry and can be used in the repair of gas pipelines in order to preserve and further use the natural gas contained therein.

When repairing a gas pipeline, transported natural gas from a repaired area, as a rule, is produced through gas pipelines-branches and gas distribution stations (GDS) to a pressure of 1 ... 1.2 MPa. The natural gas remaining in the pipe through the purge candles is discharged into the atmosphere or burned using special burners.

There are installations for pumping transported natural gas from the gas pipeline section to be repaired into the working gas pipeline section, for example, LMF BS604 mobile compressor units [1] (http.//www/lmf.su). The disadvantage of these installations is the high inlet pressure of at least 1 MPa. It is advisable to use such installations in sections of gas pipelines where it is not possible to generate transported gas to the consumer.

The closest in technical essence and the achieved result to the claimed device for the conservation of natural gas by preventing its emissions into the atmosphere when repairing pipelines is the use of mobile units for liquefying natural gas, for example, the installation of KRIOPAK (see Investinnoprom.ru> mobilnye-ustanovki ... ) or similar to it. When using them, the mobile unit is connected via a crane unit to the section of the gas pipeline to be repaired, from which natural gas has been previously generated by the consumer up to a pressure of 1 ... 1.2 MPa (minimum pressure at the unit inlet is 0.1 MPa). Further, the natural gas liquefied by the installation is transported by special vehicles to the consumer for further use.

A disadvantage of the known prototype is that it requires the presence of consumers of liquefied gas with a developed infrastructure capable of transporting, storing and selling products.

The objective of the present invention is to provide a device for the conservation of natural gas by preventing its emissions into the atmosphere when repairing gas pipelines, in which gas from the area to be repaired is directed to the working section of the gas pipeline and then to the consumer with minimal losses.

The problem is solved by constructing a technological scheme that provides:

- gas production to the consumer up to a pressure of 1 ... 1.2 MPa;

- injection of pressurized water into the pipeline section to be repaired, in order to increase the gas pressure in the pipeline to a value that allows the gas to be produced to the consumer.

The essence of the present invention lies in the fact that the inventive device for the conservation of natural gas by preventing its emissions into the atmosphere during the repair of gas pipelines, including the repaired section of the gas pipeline, limited by crane units, the gas pipe-outlet to the consumer, according to the invention, it is proposed to supplement the installation for supplying water under pressure in a repaired section of the gas pipeline to increase the gas pressure in it and to further develop it to the consumer by installing a dehumidifier for the gas supplied to the consumer, mbar for water storage, as well as the installation of clean it up.

In FIG. shows a diagram of a device for preserving natural gas by preventing its emissions into the atmosphere during the repair of gas pipelines, where:

1 - repaired section of the gas pipeline;

2 - crane unit;

3 - crane unit;

4 - gas pipeline branch;

5 - gas distribution station (GDS);

6 - installation for supplying water under pressure;

7 - installation for drying gas;

8 - installation for water purification;

9 - water intake line;

10 - a barn;

11 - drain line.

Kr1-Kr7 - cranes.

A device for the conservation of natural gas by preventing its emissions into the atmosphere during the repair of pipelines works as follows. The repaired section of the gas pipeline 1, located between the crane units 2 and 3, is blocked by cranes Kr1 and Kr2. The crane assembly 2 in FIG. shown simplistically - with one crane Kr1. Cranes Кр2, Кр3, Кр4, Кр5, Кр6 are included in the crane unit 3. Natural gas from the repaired section of the gas pipeline 1 through the gas branch 4 and the open crane Кр3 is sent to the gas distribution station 5 and then through the low pressure networks to consumers. Gas from the repaired section of gas pipeline 1 is produced by consumers up to a pressure of 1 ... 1.2 MPa, after which the Кр3 valve is shut off. Next, they connect to the crane unit 3: through the Kr4 crane - a mobile installation for supplying water under pressure 6, through Kr6 and an additionally installed crane Kr7 - a mobile gas drying unit 7, through Kr5 - a mobile water treatment unit 8. All taps are closed. Installation for supplying water under pressure 6 is connected by a water intake line 9 with a barn 10 for storing water. The water treatment plant 8 is connected to the barn 10 by a drain line 11.

After making the connections, the Кр4 crane opens, a mobile unit for supplying water under pressure 6 from the barn 10 via the intake line 9 is put into operation, while gas accumulates in the upper part of the cavity of the repaired section of the gas pipeline 1. After increasing the pressure in the repaired section of the gas pipeline 1, to the level of operating pressure, the cranes Кр6 and Кр7 open, a mobile unit for gas dehydration 7 is launched, and the dried gas is sent to the consumer. Gas is produced up to a pressure of 1 ... 1.2 MPa, after which the gas supply to the gas distribution station 5 is stopped, the installation for supplying water under pressure 6 and the installation for drying gas 7 are stopped, valves Кр4, Кр6 and Кр7 are shut off. Next, the Кр5 crane opens, a mobile water purification unit 8 is launched, and purified water is fed through a drain line 11 to the barn 10, to which it is stored for hydraulic testing of the repaired section of the gas pipeline 1. Mobile units are dismantled and transported to another section to be repaired.

It should be noted that this device for preserving natural gas by preventing its emissions into the atmosphere when repairing gas pipelines is applicable in sections of gas pipelines in which the terrain has a corresponding slope, which ensures gas accumulation, when filling the repaired section of gas pipeline 1 with water, in the area of the crane unit, to which connections are made and from which gas is taken.

The proposed device allows you to save at least 75% of the fuel, as well as to eliminate environmental damage that occurs when the gas is discharged into the atmosphere or when it is burned.

Claims (1)

A device for preserving natural gas by preventing its emissions into the atmosphere when repairing gas pipelines, including a repaired section of a gas pipeline limited by crane units, a gas outlet to the consumer, characterized in that it is proposed to supplement it with a unit for supplying pressurized water to the repaired section of the pipeline to increase gas pressure and its further production to the consumer, a unit for drying the gas supplied to the consumer, a barn for storing water, as well as a unit for its purification.

Images