The method of transportation of compressed gas

 

(57) Abstract:

The invention relates to the field of transportation of compressed gas through pipelines. The method of transportation of compressed gas includes a second gas compression on the linear parts of main gas pipeline through the ejection of the gas stream by at least one high-pressure gas stream supplied to the gas pipeline; high-pressure gas stream down to the gas pipeline at least one additional gas pipeline located in the cavity of the main pipeline and/or outside of it. In preferred embodiments, the high pressure gas stream is served in the main pipeline for one or more additional pipelines, equal or different lengths, Autonomous located in the trunk pipeline; a gas ejection flow of the main gas pipeline perform consecutively two or more high pressure gas streams supplied through the additional pipelines located within one another in the cavity of the main pipeline; high pressure gas stream is formed by sequential ejection of two or more gasolinegasoline gas flows are served in the main pipeline at one or more pipelines of equal or different lengths, outside of the main pipeline; high-pressure gas flow form through speed of ejection of the gas streams in the system for more pipelines, situated Autonomous from one another outside of the main pipeline; high-pressure gas flows is formed by the ejection of gas streams into one or more pipelines, situated in additional pipelines: gas ejection flow of the main gas pipeline carry out high-pressure gas streams supplied through the additional pipelines located in the cavity and outside of the main pipeline. The technical result of the invention is to reduce the unit cost of transportation of gas by increasing the step of placing the intermediate compressor stations. 7 C. p. F.-ly, 10 ill.

The invention relates to the field of gas and oil and gas industry and can be used in the construction and operation of gas pipelines.

There is a method of transportation of gas, including the stage of preparation of gas for transportation, compression on the lead compressor station (CS), cleaning and, if necessary, to regulate its linear sections of the main pipeline at an intermediate CA. Specified known method, was named the traditional, is the transportation of gas by one - or multi-line gas at the initial pressure of the gas at linear sections 5.5 to 7.5 MPa and compression of gas by the COP to 1,45-1,50. [see Z. So Galiulin, E. C. Leontiev. Intensification of main gas pipeline transport. M. : Nedra, 1991, S. 30-32] .

The disadvantages of the traditional method are the relatively low utilization of the useful head (0,68-0.7) and high specific costs for construction of the COP, through 110-150 km

There is a method of low-pressure gas transportation, providing increased utilization of the useful pressure (up to 0.8) when the degree of compression of gas 1,25 [see Z. So Galiulin, E. C. Leontiev. Intensification of main gas pipeline transport. M. : Nedra, 1991, S. 21-22]

However, this method of reducing the specific energy consumption for the transportation of gas by 14%, causing the need to increase the COP on the pipeline 1.5 times [see Z. So Galiulin, E. C. Leontiev. Intensification of main gas pipeline transport. M. : Nedra, 1991, S. 21-22] .

Closest to the proposed method is a method of transporting gas supply e is th (box) diameters, due to some improvement in the throughput of the pipeline, [see E. I. Yakovlev. Gas network and gas storage facilities. M. : Nedra, 1991, S. 46, 47] .

The main disadvantage of this method is associated with increased specific consumption of metal and disabilities increased step placement KS. So, during the transportation of the gas during compression ratio of 1.35 for the performance of the pipeline in the traditional step of placing the COP is a need to elaborate looping a length of 14% from the length of the linear part of the pipeline [see Z. So Galiulin, E. C. Leontiev. Intensification of main gas pipeline transport. M. : Nedra, 1991, S. 23] .

The present invention is to provide a method for transportation of gas via trunk gas pipeline, designed to reduce the unit cost of transportation of gas by increasing the step of placing the intermediate compressor stations, as well as increasing the capacity of the linear sections of the pipeline, reducing the anthropogenic impact on the environment.

This object is achieved in that a second gas compression on the linear parts of main gas pipeline is carried out by the ejection th least one additional gas, located in the cavity of the main pipeline and/or outside of it.

In preferred cases:

- high-pressure gas stream is served in the main pipeline for one or more additional pipelines, equal or different lengths, Autonomous located in the cavity of the main gas pipeline parallel to each other;

the ejection of the gas flow of the main gas pipeline perform consecutively two or more high pressure gas streams supplied through the additional pipelines located within one another in the cavity of the main pipeline;

- high-pressure gas flow fed into the main pipeline is formed by sequential ejection of two or more gas streams supplied through the additional pipelines located within one another in the cavity of the main pipeline;

- high-pressure gas flows are served in the main pipeline for one or more additional pipelines, equal or different lengths, outside of the main pipeline;

- high-pressure gas flow supplied to a gas main form through stupenchatogo the CSOs outside of the main pipeline;

- high-pressure gas streams fed into the main pipeline formed by the ejection of gas flows in one or more pipelines, situated in the cavities of additional pipelines;

the ejection of the gas stream is carried out in the main gas pipeline of high pressure gas streams supplied to the main pipeline at the same time additional pipelines located in the cavity and out of the main gas pipeline.

The invention is further explained in the description of his nature, examples of calculation of efficiency of its application and accompanying drawings, which shows:

- Fig. 1 is a schematic diagram of the ejector with the notation of the parameters of the interacting gas flows;

- Fig. 2 - scheme of filing ejecting flow of additional gas pipeline located in the cavity of the main trunk pipeline;

- Fig. 3 - scheme sequential ejection of the main gas stream of high-pressure gas streams supplied through the internal additional pipelines located in the cavity of the main pipeline;

- Fig. 4 - sequential ejection of ejecting the main pipeline;

- Fig. 5 - scheme of filing the entraining gas stream by additional pipeline located outside the main gas pipeline;

- Fig. 6 is a diagram of the formation of the primary ejecting a gas stream by means of stepwise feed of the high-pressure gas flows through the offline additional and auxiliary pipelines;

- Fig. 7 is a diagram of the formation of the primary ejecting the gas stream supplied to the main gas pipeline on the external pipeline, with his ejection gas stream supplied through the inner auxiliary gas line;

- Fig. 8 is a scheme for submission to the main gas ejecting flows sequentially through internal and external pipelines;

- Fig. 9 is a diagram of the feed into the main gas ejecting streams successively for internal and external additional pipelines;

- Fig. 10 is a scheme for submission to the main gas ejecting streams of internal and external pipelines into a single mixing chamber.

The invention consists in the following. From fluid mechanics it is known that the total pressure of one gas stream with parameters2(platnost pornoho of the gas stream with the appropriate parameters ; P1; T1; v1(see Fig. 1). A jet of gas flowing from the nozzle with an area of S1mixed with the ejected his stream of gas flowing from the channel area S2that leads to almost uniform gas flow in the section of S3located at a distance of 8 to 10 diameters of the mixing chamber, where the alignment of the density, temperature and pressure to the level of P03. In Fig. 1 shows a diagram with internal single ejecting jets, but there may be cases with the external location or feed streams to the mixing chamber multiple nozzles.

Calculation of parameters of the steady-state gas flow in the mixing chamber, regardless of the nature of the internal processes produced with respect to equations of conservation of mass consumption, energy (in the absence of external inflows) and ejecting pulses and the ejected streams (see L. I. Sedov. The mechanics of a continuous medium. Volume II. M. : Nauka, 1973, S. 122).

For gas flows with subsonic speed and the mixing chamber has a cylindrical shape, as are the pipes of main gas pipelines, such basic parameters of the gas flow, as the pressure P1; P2and R03with sufficient to prakticheskaya, 1969, S. 493):

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where R03- the total pressure of the gas stream in the mixing chamber, PA;

- coefficient of ejection;

F1F2respectively the cross-sectional area of the ejecting channels and the ejected gas flow, m2;

P1P2respectively the total pressure of the ejecting and the ejected gas flows, PA.

The proposed method is as follows. Stage of the design or renovation of the main gas pipeline is connected with the choice of schema formation and parameters of the gas flow (initial and final pressures, the throughput of the pipeline in this linear section), providing increased distance between compressor stations, equivalent or higher bandwidth of the linear part of the pipeline while reducing its specific metal consumption compared to traditional single or multi-line gas line.

The order of the choice of the method involves the following basic steps.

1. To calculate the throughput of a traditional main pipeline when it is given geometrical parameters and the parameters of the gas transported by A. I. Guzhov. Collection, transport and storage of natural hydrocarbon gases. M. : Nedra, 1978, S. 325] :

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where q is the throughput of the pipeline, million m3/day. (at 20oC, 760 mm RT. Art. );

D - internal diameter of the pipeline, m;

PNand Rtorespectively the initial and final pressure of the gas on the current pipeline, PA;

- the relative density of the gas in the air;

Zcpaverage length of pipeline compressibility factor of gas;

Tcfaverage length of pipeline gas temperature, K;

l is the length calculation section of the pipeline, m

2. Choose to calculate one or more variants of formation of the gas flow in the circuits of Fig. 2-10 or combinations thereof.

3. To set the geometric parameters of additional pipelines (diameter and length).

4. Taking into account the technical capabilities of the compressed gas, the practical data or by calculation to determine the gas pressure at the compressor outlet and the total pressure of the gas in the secondary gas before feeding it into the main pipeline.

5. To find the total pressure of the gas in the mixing chamber of the main gas pipeline Roses on forms and gas pipelines and throughput of the latter by the formula (2).

7. Based on the obtained total flow and total pressure of the gas in the mixing chamber to determine the required spacing of increasing distance transportation of gas to the intermediate compressor station (at a given gas pressure at the entrance).

8. The final stage of selecting the method of transportation of gas and generation of gas streams involves technical and economic comparison of alternatives, with a view to assessing the impact as noted below positive factors and negative complication technology pipeline, the potential increase in energy consumption.

Forming the gas flows by the appropriate location of additional pipelines relative to the main pipeline. In Fig. 2 additional pipeline 2 with a diameter of D3and length L2placed in the cavity of the main gas pipeline l diameter D1. In this case it's one additional pipeline 2, however, possible options for the location of two or more additional pipelines, and they may be the same or different length.

In Fig. 3 illustrates the case when in the main gas line 7 is placed two additional Gazoprovod the2and D2>D3and L2>L3. With such dimensioning of possible location of one in the other three (D2>D3>D4when L2>L3>L4and more additional pipelines.

Unlike the previous case of the variant shown in Fig. 4, characterized by the fact that additional pipeline 2 with a diameter of D2the length L2is longer than a minor D3length L3. Accordingly, the same value can occur for three or more additional and auxiliary pipelines.

In Fig. 5 additional pipeline 4 with a diameter of D2located outside the main gas pipeline l and mates with the last PA distance L2. According to this scheme to the main pipeline can be fed two or more additional pipelines equal or different length and diameter.

In Fig. 6 shows a variant in which the outer additional pipeline 4 is equipped with an outer auxiliary gas 5, and Fig. 7 - internal auxiliary gas 6. The length L3and the diameter D3auxiliary gas 5 and 6 are limited to sootvetstvuyuschimi options combined arrangement of additional and auxiliary pipelines, pairing them with the main gas pipeline, including the simultaneous functioning of the internal and external additional gas pipelines, with the length of the first of them may be longer than the second (see Fig. 8), less (see Fig. 9) or they may be of equal length (see Fig. 10).

Transportation of gas for the proposed method is as follows. In the main gas line l (see Fig. 2) on the head or intermediate compressor station serves the compressed gas under an initial pressure P1-1. At the same time additional pipeline 2, located in the cavity of the main pipeline 1, serves the gas pressure P2-1= Pd+P1-1where Rdis the gas pressure, permissible under the terms of the strength of the pipe of this type. The additional length of pipeline L2is chosen so that at the junction of two streams of gas pressure gas in which R1-2and R2-2in accordance with the dependence (1) provided the gas pressure in the mixing chamber R03equal to or close to the value of the initial pressure in the main pipeline P1-1. The differential gas pressure in the mixing chamber R03and the final pressure in this linear plot of magistrate.

When the internal location of additional pipelines in the circuit of Fig. 3 creates a dual mode (in this case) of the gas ejection flow of the main gas pipeline 1: plot L3by means of an intermediate additional pipeline 2 and the area L2through the internal pipeline 3. The initial pressure of the gas flow in the internal additional pipeline 3 is greater than in the intermediate pipeline 2, but it is necessary to consider the level of gas pressure in the inner 3 and the base 1 of the gas pipelines in the area L2-L3.

In the circuit of Fig. 4 gas streams ejected sequentially: first the internal pipeline 2 and then the main pipeline 1. When this auxiliary gas 3 can be made higher than in the pipeline 2, the gas pressure, which creates opportunities to increase the pressure of the entraining jet at the exit into the main pipeline 1.

When the external location of additional pipeline 4 relative to the main pipeline 1 (see Fig. 5) the pressure of gas in the ground is determined by the structural strength of the pipe and it is naturally lower than in the domestic location doolette cross-section of the main pipeline, to a lesser extent, limited the choice of the diameter of the pipes may fold connecting multiple additional pipelines to one mixing chamber, and the creation of the length of the main pipeline multiple cameras blending.

Maintaining pressure end entraining gas flow in the external additional pipeline 4 is realized by feeding the gas flow auxiliary gas 5 (see Fig. 6), the pressure may be higher than in the pipeline 4, because it is made of tubes of smaller diameter, characterized by a higher ultimate strength.

Pressure end entraining gas flow of additional gas pipeline 4 on the circuit of Fig. 7 increase through the ejection gas stream of auxiliary gas 6, working in the back pressure of the gas in the pipeline 4.

A compromise solution to the problem of accounting for the strengths and weaknesses of the schemes with internal and external location of additional pipelines relative to the main options are combined placement 7 internal and external 8 additional pipelines, and in certain cases the length of the internal additional gas pipeline the gas pipeline, located on the circuit of Fig. 10 interact with the main gas stream together in a common mixing chamber.

Examples of calculation of parameters of traditional and variants of the proposed method of transportation of gas made based on practical data about the state of the gas streams: 1)N= 7.5 MPa; PTO= 4,9 MPa; = 0,7; Zcp= 0,864; TCP= 307,5 To; 2) Pn= 11.8 MPa; PTO= 8,9 MPa; = 0,7; Zcp= 0,802; TCP= 308,5 To [see Z. So Galiulin, E. C. Leontiev. The intensification of the main carrier gas. M. : Nedra, 1991, S. 14] .

1. Bandwidth is taken for the comparison of traditional pipeline with an inner diameter of DNR= 1,38 m length calculation section l= 100 km, in accordance with formula (2) is equal to:

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2. A variant of the proposed method with accommodation in the main pipeline with DBH= 1,38 m additional pipeline with an outer diameter of DH= 0,82 m in the circuit of Fig. 2. Permissible pressure gas pipe DH= 0,82 m is 10 MPa, taking into account the back pressure taken RH= 17,5 MPa. Estimated area l= 100 km Final pressure Pto= 12 MPa. Then the bandwidth of the inner pipe for pipeline

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Given the internal diameter of the channel-Palast is notrandom diameter1and additional pipeline with an outer diameter of D2,

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Bandwidth-cavity

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The total capacity of the main pipeline

qM= qin+qp= 56,7+43,4= 100,1 million m3/day.

In accordance with relationship (1) between two gas streams coefficient of ejection = 0,82/1,112= 0,52,

and the total pressure of the gas in the mixing chamber

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Distance transportation total gas flow 100,1 million mC/day. on the main pipeline after ejection at the same pressure drop of gas, as in the initial part, i.e. when RN= 7.4 MPa and pTO= 4,9 MPa in accordance with the dependence (2) is equal to

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Bandwidth traditional main gas pipeline with a length of 195 km when the gas pressure drops with p1= 7.5 MPa to p2= 4,9 MPa would be:

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i.e. according to the scheme of transportation of gas ejection throughput of the main gas pipeline 45% more.

Please rate the intensity of gas per unit of their daily throughput (mass 1 m pipe diameter of 1.42 m and 0.82 m respectively 691,6 kg and 200,7 kg).


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i.e., the specific consumption of the metal in the second case by 25.8% less than in the first. A comparative evaluation showed that the ejection of the main gas flow of the high pressure gas stream supplied through the additional gas pipeline located in the cavity of the main gas pipeline, provides:

- doubling of distance transportation of gas without compressing it at the intermediate compressor station;

- when saving interval of the intermediate compressor stations increasing the capacity of the main pipeline by 45%.

- reduction of specific consumption of metal PA construction of gas pipelines by 26%.

3. Accommodation in the main pipeline with a diameter of D1= 1.42 m two additional pipelines in the circuit of Fig. 3: diameter D2= 0,82 m, a length of 50 km and a diameter of D3= 0,53 m length of 100 km

Given the diameter of the cavity between the pipelines D1and D2< / BR>
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The bandwidth of this cavity at length calculation section l= 50 km, the initial pressure pH= 7.5 MPa, and the pressure drop in this area of 1.5 MPa, i.e.to= 6 MPa is equal to

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Given the diameter of the cavity between the gas is UB>= 12,5 MPa.

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The coefficient of ejection of the gas flow of the gas D2and D1< / BR>
< / BR>
The total pressure of the gas stream in the mixing chamber of the gas D2and D3< / BR>
< / BR>
The total flow of gas through D1from the mouth of the pipeline D2to the mouth of the pipeline D3< / BR>
q1-3= q1-2+q2-3= 63,8+36,0= 99,8 million m3/day.

We find from (2) the final pressure of the gas in the area from the mouth of the pipeline D2to the mouth of the pipeline D3length l= 50 km.

Given the diameter of the cavity between the pipelines D1and D3.

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The final pressure of the gas in this area is 5.7 MPa.

The capacity of the pipeline D3length l= 100 km, with pH= 20 MPa and pto= 15 MPa

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The ratio of the ejection flow of the gas D3and D1< / BR>
< / BR>
The total pressure of the gas stream in the mixing chamber of a gas pipeline D1in connection with the pipeline D3< / BR>
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The total gas flow in the main pipeline D1after connecting three streams

q = 63,8+36,0+18,5 = 118,3 million m3/day.

i.e., pipeline capacity, with dual serial EOL is tick the COP is supported by the pressure at the end of the linear section 7.0 MPa, providing transportation of gas even at 90-100 km

Two-stage ejection of the gas flow in the circuit of Fig. 3 in comparison with single-stage ejection increases the capacity of the pipeline by 18%, as compared to the traditional method of transportation with a length of 200 km - 85% (respectively 118,3 and 63.9 million m3/day. ). Specific metal pipeline with a length of 195 km with two-stage ejection is 1.3 kg/m3per day, i.e. 20% lower than in single-stage and 50% than traditional pipeline.

Thus, the proposed method of transportation of compressed gas from the gas ejection flow compared with the traditional method of transportation has a number of advantages:

- increases 1.5-2 times the interval of arrangement of the intermediate compressor stations with the ensuing feasibility, social and environmental consequences;

- increases the intensity of the process of transportation of compressed gas through the pressure regulation of compressed gas along the length of the linear section of the pipeline and, consequently, increase its capacity;

- snige usknow ability).

The proposed method provides the possibility of choosing the optimal formation of the gas flows and their parameters that are appropriate for the particular initial conditions and requirements to the gas pipeline.

1. The method of transportation of compressed gas through the main gas pipeline, including the preparation of gas, compressing it to a given level of pressure on the head of the compressor station and feeds it into the main pipeline periodically re-gas compression to compensate for the pressure loss of the gas stream on the linear parts of main gas pipeline, characterized in that the re-gas compression on the linear parts of main gas pipeline is performed by ejection of gas flow by at least one high-pressure gas stream supplied to the main gas pipeline, located in the cavity of the main pipeline and/or outside of it.

2. The method according to p. 1, characterized in that the high-pressure gas stream is served in the main pipeline for one or more additional pipelines, equal or different lengths, Autonomous located in the cavity of the main pipeline at the tion of the pipeline perform consecutively two or more high pressure gas streams, submitted by additional pipelines located within one another in the cavity of the main pipeline.

4. The method according to p. 1, characterized in that the high-pressure gas flow fed into the main pipeline is formed by sequential ejection of two or more gas streams supplied through the additional pipelines located within one another in the cavity of the main pipeline.

5. The method according to p. 1, characterized in that the high-pressure gas flows are served in the main pipeline for one or more additional pipelines, equal or different lengths, outside of the main pipeline.

6. The method according to p. 1, characterized in that the high-pressure gas flow supplied to a gas main form through speed of ejection of the gas streams in the system for more pipelines, situated Autonomous from one another outside the main pipeline.

7. The method according to p. 1, characterized in that the high-pressure gas streams fed into the main pipeline formed by the ejection of gas flows in one or more pipelines, the location in the main gas main gas stream carry out high-pressure gas streams, supplied to the main gas pipeline of additional pipelines located in the cavity and outside of the main pipeline.

 

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