RU2812686C1 - Method for non-consumption purging gas purification units at compressor station - Google Patents

Abstract

FIELD: gas industry.

SUBSTANCE: operation of compressor stations of main gas pipelines (hereinafter - CS), in particular gas purification units. The method consists in the fact that gas from the CS purification unit is directed to the CS condensate collector through an equalizing pipeline and supplied to the low-pressure output gas pipeline of the gas distribution station (hereinafter referred to as the GDS) through the gas ejection unit. The output pipeline of the gas ejection unit is connected to the output pipeline of the GDS through a metering unit with a control valve designed to limit the gas flow within the limits allowed by the operational characteristics of the gas metering unit of the GDS. In this case, by opening the control valve, gas is supplied from the gas ejection unit to the low pressure inlet pipeline of the gas metering unit. After reaching the residual gas pressure in the condensate collector equal to the gas pressure in the low-pressure output pipeline of the GDS, open the valve at the inlet of the gas ejection unit and turn on the ejector, which ensures complete pumping of the residual gas in the CS condensate collector. The effect is complete elimination of gas emissions into the atmosphere during purging of gas purification units of the compressor station and gas metering by means of gas flow measurement.

EFFECT: increased energy saving and environmental efficiency of the gas transportation system, as well as accurate metering of gas consumption for process needs.

1 cl, 1 dwg

Description

The invention relates to the field of operation of compressor stations of main gas pipelines (hereinafter - CS), in particular gas purification units. The method consists in the fact that gas from the CS cleaning unit is directed to the CS condensate collector through an equalizing pipeline and supplied to the low-pressure output gas pipeline of the gas distribution station (hereinafter referred to as the GDS) through the gas ejection unit.

There is a known method for purging a gas purification unit and a device for its implementation (Pat. 2460000 Russian Federation, IPC ⁷ F16L 55/07. A method for purging a gas purification unit and a device for its implementation / S.T. Pashin, R.Yu. Distanov, I. G. Ismagilov, M. V. Chuchkalov, S. M. Faizullin, E. S. Ivanov, E. R. Yunusov, M. G. Khismatullin - No. 2010140885/06; application 10/06/2012; published 08/27/2012 , Bulletin No. 24) [1], according to which the purged gas enters through a drainage pipeline into a condensate collector with a closed candle pipeline with subsequent gas production to the output pipeline of the gas distribution station. After the end of production, residual gas with a pressure equal to the output pressure of the gas distribution system.

The disadvantage of this known method is the presence of gas emissions into the atmosphere and a fee for gas emissions if it is necessary to carry out work with opening the condensate collector tank.

There is a known method for producing gas from gas purification devices and a device for its implementation (Patent 2667722 Russian Federation, IPC ⁷ F17D 1/04. A method for producing gas from gas purification devices and a device for its implementation / E.B. Grigorchuk - No. 2016151227; application 12/26/2016; published 09/24/2018, Bulletin No. 27) [2], which consists in the fact that gas production from the CS gas purification units to the low pressure output pipeline of the GDS is carried out until the residual gas pressure in the CS gas purification unit is equal to 0 .7 MPa, with subsequent release of residual gas into the atmosphere.

The disadvantage of this known method is the presence of residual gas emissions into the atmosphere and charges for gas emissions.

The prototype is a method of non-consumption purge of gas purification units (Pat. 2746172 Russian Federation, IPC ⁷ F16L 55/07, F17D 1/04. Method of non-consumption purge of gas purification units / PP Usmanov, M.V. Chuchkalov, I.R. Gimranov - No. 2020122639, application 07/03/2020; publ. 04/08/2021, Bulletin No. 10) [3], which consists in the fact that the purged high-pressure gas is transferred from the gas purification unit through a drainage pipeline into a closed condensate collector, after which the gas from the condensate collector through The equalizing pipeline is supplied to the outlet pipeline of the gas distribution station with low pressure, the residual pressure in the condensate collector is completely generated through the ejection unit.

The disadvantage of the prototype is gas accounting by calculation without the use of gas flow measuring instruments, with a greater error.

The purpose of the invention is to completely eliminate gas emissions into the atmosphere and fees for gas emissions during purging of gas purification units of compressor stations and to reduce the error when accounting for gas consumption.

The technical result is the complete elimination of gas emissions into the atmosphere during purging of gas purification units of the compressor station and gas accounting by means of gas flow measurement.

The technical result is achieved by the fact that the condensate collector KS is connected through a pipeline to the gas ejection unit of the GDS. The output pipeline of the gas ejection unit of the GDS is connected to the low-pressure input pipeline of the gas metering unit of the GDS, with an additionally mounted control valve to limit the gas flow within the limits permitted by the operational characteristics of the gas metering unit of the GDS.

The proposed method of non-consumption purge of CS gas purification units is that the purged gas from the CS gas purification unit through the drainage pipeline enters the closed container of the KS condensate collector, after which the gas from the condensate collector through the equalizing pipeline, gas ejection unit and gas metering unit is supplied to the outlet pipeline low pressure GDS. The method differs in that the output pipeline of the gas ejection unit is connected through a control valve to the input pipeline of the gas metering unit, which ensures that the purged gas from the CS gas purification unit is metered by means of gas flow measurement.

The present invention is illustrated in Fig. 1, where 1 is the equalizing pipeline; 2 - valve on the equalizing pipeline; 3 – pipeline connecting the output pipeline of the gas ejection unit and the output pipeline of the gas metering unit; 4 - output pipeline of low pressure GDS; 5 - spark plug pipeline with a tap on the compressor station; 6 - condensate collector KS; 7 - spark plug pipeline with a valve to the gas distribution station; 8 - GDS condensate collector; 9 - gas purification filter; 10 - gas metering unit; 11 - valve at the inlet of the gas ejection unit, 12 - control valve; 13-18 - CS gas purification unit; 19 - drainage pipeline; 21-27 - drain valves at CS gas purification units; 29-34 - valves at the entrance to the CS gas purification units; 35-40 - valves at the outlet of the CS gas purification units; 41 - high pressure pipelines; 42 - GDS gas ejection unit; 43 - GDS reduction unit.

The proposed method is implemented as follows.

Pipeline 1 with valve 2 is being installed between the candle pipeline with valve 5 of the condensate collector 6 and the candle pipeline with valve 7. Jumper 3 of the ejector output line 42 is being installed in the line of the input pipeline of the gas metering unit 10, with control valve 12.

When emptying condensate from a gas purification unit (consisting of dust collectors 13, 14, 15, 16, 17, 18 and closed inlet valves 34, 33, 32, 31, 30, 29 and closed outlet valves 40, 39, 38, 37, 36 , 35, respectively) by opening valves 21, 22, 23, 24, 25, 26, 27 through the drainage pipeline 19, condensate flows from the CS gas purification unit into the condensate collector 6 with the spark plug valve 5 closed and valve 2 closed. After the condensate drainage is completed ( time 20...30 min) taps 21, 22, 23, 24, 25, 26, 27 - close. Next, by opening valve 2, gas through pipeline 1 enters the candle pipeline with closed valve 7 and then into the gas ejection unit 42. By opening the control valve 12, gas is supplied from the gas ejection unit to the low-pressure inlet pipeline of the gas metering unit 10. After reaching the residual pressure gas in the condensate collector is equal to the gas pressure in the low-pressure output pipeline of the GDS, open valve 11 and turn on the ejector 42, which ensures complete pumping of the residual gas in the condensate collector.

The use of the claimed invention makes it possible to increase energy saving and environmental efficiency of the gas transportation system, as well as to maintain accurate gas accounting for one’s own technological needs.

Claims (1)

A method for purging gas purification units, which consists in the fact that the purged high-pressure gas is transferred from the gas purification units through a drainage pipeline into a closed condensate collector, from the condensate collector through an equalizing pipeline and an ejection unit into the low-pressure output gas pipeline of a gas distribution station (GDS), characterized in that gas purification units are gas purification units of the compressor station (CS), the condensate collector is the condensate collector of the CS, the output pipeline of the gas ejection unit is connected to the output pipeline of the GDS through a metering unit with a control valve designed to limit the gas flow within the permissible operational characteristics of the gas metering unit of the GDS, in this case, by opening the control valve, gas is supplied from the gas ejection unit to the low-pressure input pipeline of the gas metering unit, after reaching the residual gas pressure in the condensate collector equal to the gas pressure in the low-pressure output pipeline of the gas distribution station, open the valve at the inlet of the gas ejection unit and put it into operation an ejector that ensures complete pumping of residual gas in the CS condensate collector.

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