The method of transportation of compressed gas and a device for its implementation

 

(57) Abstract:

The invention relates to pipeline transport and can be used for transportation of compressed gas through pipelines, in particular, on the areas of large extent, related to the impossibility or difficulty of construction of the intermediate compressor stations. In the method of transportation of compressed gas through the main gas pipeline additional gas pressure in the main pipeline create by means of the gas at the intermediate and/or final compressor stations of main gas pipeline, further compression and subsequent submission of the entraining gas flow in the intermediate points of the main pipeline; the device for transportation of compressed gas through the main gas pipeline linear section of the main gas pipeline adjacent to the final or intermediate compressor stations equipped with at least one additional gas pipeline, located with the possibility of filing in the intermediate points of the linear section of the main pipeline in the reverse direction of the gas streams higher pressure, created at the compressor station to which it is adjacent. Technical achiev the gadfly, the reduction in compressor stations Park units for compression of high pressure gas; improving the reliability and safety of operation of the main pipeline. 2 S. p. f-crystals, 2 Il.

The invention relates to gas industry and can be used in the construction and operation of trunk gas pipelines increased length associated with the inability or difficulty of construction of the intermediate compressor stations (CS).

Known methods and devices for transporting compressed 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 on the COP, equal 1,45-1,50.

The disadvantages of these methods and devices are: increased energy consumption in the gas compression due to the relatively low utilization of the useful head (of 0.68 to 0.70); high specific costs associated with construction and operation of the COP placed through 110-150 km [E. I. Yakovlev. Gas network and gas storage facilities. M.: Nedra, 1991, S. 46,47].

There is also known a method and an apparatus for transporting compressed gas to flow through the main gas and the additional gas is the capacity of the pipeline-prototype [see Jablonski, S. J. Design of oil and gas pipelines. Costoptimized. M., 1959, S. 270,285].

The main disadvantage of this method and device is associated with an increased specific consumption of metal with a slight increase in the length of the linear section of the pipeline.

In the present invention solved the problem:

- reducing the initial pressure of the gas in the main gas line section of the great length while maintaining the specified throughput and his final pressure gas;

- increase the capacity of the linear part of the pipeline great length under given initial and final pressure of the gas in the main gas line;

- increase the length of the linear part of the pipeline while maintaining the specified bandwidth him and the acceptable level of the initial pressure of the gas.

The technical result of the invention are:

- reduction of specific consumption of metal for the construction of the main pipeline, as equals marginal gas pressure in the pipes of larger and smaller diameters are provided in the past with a smaller wall thickness; and, as a consequence, the reduction of costs for the manufacture of pipes (often in special design) program, since significantly reduced the proportion of such gas and, as a consequence, reduced energy consumption to receive it;

- improving the reliability and safety of operation of the main pipeline as the gas of higher pressure serves pipes of smaller diameter, which decreases the likelihood of defects in the material structure.

The solution of this problem is achieved by the fact that the additional pressure of the gas in the main gas pipeline create by means of the gas at the intermediate and/or final compressor stations of main gas pipeline, further compression and subsequent submission of the entraining gas flow in the intermediate points of the main pipeline; the linear parts of main gas pipeline adjacent to the final or intermediate compressor stations equipped with at least one additional gas pipeline, located with the possibility of filing in the intermediate points of the linear section of the main pipeline in the reverse direction of the gas streams higher pressure created by the compressor station to which it is adjacent.

The invention is further illustrated by a description of its essence, the procedure of calculation of the parameter is investing gas and accompanying drawings, which shows the compared options for gas transportation:

- Fig.1 - scheme of transportation of gas with two intermediate delivery points ejecting streams (proposed option);

- Fig.2 - scheme of transportation of gas with high initial pressure (known option).

The invention consists in the fact that decreasing the length of the linear section of the gas pressure in the gas stream is increased by the ejection of its gas stream with a higher gas pressure, and the entraining gas stream can be created on the head COP and taken to an intermediate point of the linear section for additional pipeline or on the next, intermediate, KS. In the latter case, the entraining gas stream to create an intermediate CA by sampling gas from a gas flow of the main gas pipeline, komprimiert it to the required level and fed to an intermediate point of the feed in the main gas pipeline of additional pipeline.

Used for ejection of a certain volume of gas circulates in the last stage of the linear section as an integral part of the main flow of gas that is converted into a stream of high pressure gas directed to the second method and apparatus for transporting compressed gas is as follows. With the known length of the longest segment and the specified bandwidth of the pipeline q take its diameter D satisfying the conditions of its operation. To estimate the parameters of the original version of the transportation of gas, with a gradual decrease in pressure along the length of the linear section of the pipeline. Next, you will set the approximate level of the lower initial gas pressure or by evaluating several options for filing in the gas ejecting streams determine the maximum possible reduction of the initial gas pressure in the main pipeline. However, depending on the length of the linear section can be evaluated with different design layout of additional pipelines. In the case of a single intermediate point feed into the main gas ejecting flow of additional gas can be stretched from the head of the COP or the next intermediate CA. At considerable length of the linear section of the ejection of the main gas stream is produced at one intermediate point and two or more feed ejecting flows from the head and intermediate CA.

For gas flows with subsonic and mixing chambers of the cylindrical shap the Tr tubes sufficient for practical purposes, the accuracy (error of 2-4%) are associated with dependence [see G. N. Abramovich. Applied gas dynamics, M.: Nauka, 1969, S. 493]:

< / BR>
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;

P1, R2respectively the total pressure of the ejecting and the ejected gas flows, PA.

The order of implementation of the method is demonstrated on the example of the linear section of the main pipeline with two intermediate delivery points ejecting streams - option 1(see Fig.1) in comparison with the single-pipeline - option 2 (see Fig.2). The length l of the main gas pipelines and their inner diameter DNRin both cases the same. Transportation of gas through a single pipeline 1 is at the initial pressure PNcreated on the head COP 1, and the final pressure PTOat the entrance of the intermediate CA 3, providing bandwidth q.

In accordance with the proposed design of the gas pipeline linear plot with two intermediate delivery points ejecting streams 4 and 5 are divided into three parts of equal or nerved 6 runs from CS 1 to 4, and the other additional gas 7 from the CS 3 to item 5.

The throughput of a gas main option 1 is determined by the bandwidth capabilities of the principal0and additional qdgas pipelines, i.e., q=q0+qd. Since q0<q,the initial pressure in the pipeline PBUT<Pthat makes operation more reliable, reduces the wall thickness of the pipe and, therefore, the metal structures and the cost of its construction. The initial pressure of the gas in the secondary gas pipeline 6 RNDtaken from the condition run its stream function of the ejection of the main gas stream in step 4. PND>RNthe advantages of option 1 are not excluded, because the pipe of smaller diameter have lower risk of failures, and less intensity. On a plot of l2the main pipeline at an initial pressure of the gas in the mixing chamber R03= PP1and a final pressure PK2provided transportation total gas volume - q. It is obvious that the pressure of the main gas stream in paragraph 5 RK2will be insufficient for the transportation of gas through the feed in paragraph 5 of the additional gas 7 gas flow high pressure (P')NDcreated at COP-3. Required for ejection of the main gas flow final pressure P'KDis set so that the capacity of the area l3included gas volume flow qpsubmitted by additional pipeline 7, i.e.

qP=q+qp< / BR>
Example of calculation of parameters of gas transportation on the proposed method and device are made in comparison with the known variation of the transporting gas at the long gas pipeline, designed to seal on the bottom of the sea (with a maximum dive depth of 2150 m) with single-stage pressure drop between compressor stations [see Goryainov Y. A., resonance C. I., Fedorov, A. S. Kharionovsky centuries "Blue stream": scientific and technical problems and their solution. "Gas industry", 4, 2000, S. 32-33].

Known variant of the pipeline (see Fig.2) is characterized by the following conditions: length l= 390 km; diameter of 0.61 m and the wall thickness 31.8 mm (adopted an internal diameter of DNR=0,54 m); initial pressure PN=25,0 MPa, the resultant pressure PP=5,4 MPa; the temperature of the gas at the beginning of the track 35oWith, at the end of about 0o(Taken TCF=300 K). Projected throughput sposobnostey: relative density = 0,6; the average compressibility factor Zcp=0,75.

The proposed variant of the pipeline (see Fig.1) is divided into three sections of equal length l1+l2+l3=390 km. the Other parameters of the gas pipeline and gas remain the same. The internal diameter of the additional pipeline dNR= 0,398 m

Consider the case when the section l1the main pipeline of the initial gas pressure is reduced to 8.0 MPa, i.e., 32% PBUT=MA. The gas pressure in the end of the section l1(punct) PCO=EA.

The capacity of the area l1the main pipeline in quadratic mode of motion of the gas [see A. I. Guzhov. Collection, transport and storage of natural hydrocarbon gases. M., Nedra, 1978, S. 326] will be

< / BR>
After substitution and calculation have

< / BR>
Accordingly, the throughput of additional gas on a plot of l1must be

q1=q-q01=22,1-18,9=3.2 million m3/day.

As for the initial pressure in the main pipeline, let the full pressure of the gas in the mixing chamber of paragraph 4, is equal to RP1=17 MPa. Then the final pressure in the secondary pipeline, providing a given level of P1< / BR>
< / BR>
The initial pressure in the secondary pipeline section l1PNDdetermine from the condition of providing them the specified amount of bandwidth q1< / BR>
< / BR>
Where RND=26,6-106PA=26,6 MPa.

The plot of l2the pipeline must provide transportation total gas volume q, i.e. q02=q, with the initial pressure PP1and a final pressure in paragraph 5 RK2that is determined by the dependence of

< / BR>
Where RK2=9,5106PA=9,5 MPa.

To maintain the gas pressure at the end of the pipeline PTO=5,4 MPa in the mixing chamber of paragraph 5 should be created total pressure PP2. It should be borne in mind that the area l3pipeline capacity, q03= q02+q2.Calculation of parameters of the transporting gas at this stage is iterative in nature, because the unknown bandwidth of the second additional gas pipelinep. Under equal conditions with the first additional pipeline as a first approximation should be taken throughput - q01. Our iteration in this calculation misses, and then it will be shown that q2= 30,8-106PA = 30,8 MPa.

The magnitude of the loss of gas pressure in the second additional gas with the same parameters with the first additional pipeline is taken equal to 0.4 MPa. Then the initial pressure of the gas stream in the second additional gas will amount to 31.2 MPa, and throughput will be equal to

< / BR>
In the process of circulation of the entraining gas flow on the section l3involved double the volume of gas enclosed in an additional pipeline. The weight quantity of this gas at a relative density = 0.6 and absolute density = 270 kg/m3at an average pressure of 31 MPa and Tcf=18oWith is

< / BR>
and the volume of this gas at normal conditions is equal to 11.2 million m3.

Thus, the volume of gas used in a closed loop for the ejection of the main gas flow equal to half of the daily performance of the pipeline, which in relation to the volume of gas passing through it during the year, will be negligible to 0.14%.

The above example clearly illustrates the power of the proposed method and device in solving the problems of transportation of gas via trunk gas pipeline with the length is Ecevit:

- reduction of pipe wall thickness and, consequently, a decrease in specific consumption of metal, the cost of manufacture of pipes and the construction of the pipeline;

- reduction at compressor stations Park units for compressing gas with a high pressure level, as with the proposed method of transportation significantly reduced the proportion of such gas;

- increase of reliability and safety of operation of the main pipeline, as the share of high-pressure gas is supplied through the pipes of smaller diameter, which decreases the probability of defects in the material structure.

1. The method of transportation of compressed gas through the main gas pipeline, including compression gas main compressor station and feeds it into the primary or the primary and secondary pipelines, additional gas compression at intermediate compressor stations, characterized in that the additional pressure of the gas in the main gas pipeline create by means of the gas at the intermediate and/or final compressor stations of main gas pipeline, further compression and subsequent submission of the entraining gas flow at intermediate points of the primary is causee main compressor station, the primary or the primary and secondary pipelines, equipment for receiving and additional gas compression at intermediate compressor stations, characterized in that the linear parts of main gas pipeline adjacent to the final or intermediate compressor stations equipped with at least one additional gas pipeline, located with the possibility of filing in the intermediate points of the linear section of the main pipeline in the reverse direction of the gas streams higher pressure created by the compressor station to which it is adjacent.

 

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