Method of control of technological parameters at pipeline sections with reduced allowable gas pressures
The invention relates to techniques for managing operations of the process gas transportation. The technical result of the invention is the implementation of low-energy process of gas transportation through the current main gas pipeline. This is achieved by regulation of mutual raspredelenie degrees of compression of the compressor stations of gas pipeline from preferential conditions of operation of compressors compressor stations with a minimum compression ratio maximum gas inlet pressure and the maximum gas pressure at the outlet, the choice of modes of compressors compressor stations should be excluded as exceeding the permissible operating pressure of the gas on the pipeline for a compressor station, and going beyond the limits of operational parameters of the compressors, which are defined using combined gas-dynamic characteristics. 3 table.
The invention relates to techniques for managing operations of the process of transportation of gas via trunk gas pipelines through compression, in which Gazoprovod, considered as a system, and is intended for regulation as highlighted sections of trunk gas pipelines, including several compressor stations (CS), and entire trunk gas pipelines from production to gas consumers.
The purpose of the invention is the regulation of the process parameters of gas transportation through the current main gas pipeline, on separate sections between which the COP during operation restrictions permissible operating pressure of the gas relative to the nominal design value for the blowers COP with a minimum total capacity of compression and, therefore, the implementation of the transport gas with minimum energy consumption.
There are recommendations [1; 2] for the implementation process of the transportation of gas via trunk gas pipeline, providing a minimum total capacity of compression compressors by reducing the step between the COP and maintain maximum gas pressures at the outlets of the blowers KS. Recommendations in addition to the indications on the economic feasibility of maintaining the maximum allowable gas pressures at the outlets nineteeth control of process parameters at pipeline differences in maximum permissible voltages on sites and mainly applicable only at the stage of development of the project of construction of the main pipeline using pipe of the same size with the same maximum permissible stresses in the pipe wall.
There is a method of control of technological parameters of the main pipeline  (patent SU # 1755000, CL F 17 D 1/00, priority dated November 25, 1987), according to which as regulated quantities taken the degree of pressure increase or the compression ratio of each compressor, the optimum current value which is determined is given in the patent addiction. The main disadvantage of this method lies in the fact that the dependencies do not take into account the physical essence of the process of transport of gas through pipelines by means of compression, i.e. the lack of optimum power compression , since, as a rule, the higher the output pressure compressors COP, the less power required compression compressors COP. Besides, this method also does not imply the use of the different values of maximum allowable gas pressures on sections of the pipeline.
In practice, traditionally tend to work with equal capacity compression KS that do not always correspond to the proposed recommendations and the methods of regulation.
Task - develop method of regulating the functioning of the main pipeline, obezlyudela COP minimum, that is, the minimum energy consumption for the transport of gas, in the presence of sections of the pipeline between the COP with reduced relative to the nominal design value of the maximum permissible gas pressure regardless of the size of this reduction and the underlying reasons. Thus regulation of the main pipeline with the same at all sites maximum allowable gas pressures for the proposed method is a special case.
As an object of regulation the main pipeline is a chain of consecutive COP and followed sections of the pipeline, namely:
INPUT 1-I COP the 1st section of the pipeline
2-I KS 2nd section of the pipeline
3-I COP the 3rd section of the pipeline
i-I CS i-th section of the pipeline
(N-1)-I KS (N-1)-th pipeline
N-I CC N-th section of the pipeline OUTPUT.
The implementation of the method is as follows.
1. While the pipeline is measured by conventional methods and means or set the following parameters (i=1; 2; 3;...; N-1; N):
Qi- the charge of the transported gas inlet blowers i-th KS, nm3;
QOPT- desired flow transport is articheski the flow of the transported gas at the outlet of the main gas pipeline, nm3;
POPTthe absolute pressure of the transported gas at the outlet of the main gas pipeline required for submission at the outlet of the main gas pipeline gas flow QOPT(set Manager), MPa;
POthe actual absolute pressure of the transported gas at the outlet of the main gas pipeline, MPa;
PIthe absolute pressure of the transported gas inlet of the main gas pipeline, MPa;
PSTAGE ithe absolute maximum permissible pressure of the gas transported for the section of the pipeline after the i-th KC-defined maximum stresses in the pipe wall or due to other reasons, MPa;
Pl,ithe absolute pressure of the gas transported on the input of the i-th CS, and R1.1=PI, MPa;
P2,ithe absolute pressure of the gas transported on the output of the i-th COP, MPa;
T1,ithe temperature of the transported gas inlet of the i-th KS, K;
T2,ithe temperature of the gas transported after the i-th COP, K.
2. Determine the actual compression ratio compressors i-th KC
and the average temperature gas stations
4. The outlet pressure of the blower of each i-th CA R2,icompared with the allowable pressure PSTAGE ifor the section of the pipeline after the first COP, the compression ratio of the i-th CSi; compare with its limiting valuesmaxandminon the basis of working conditions blowers in the group, and the gas pressure at the outlet of the main gas pipeline Rocompare with the required gas pressure at the outlet of the main gas pipeline ROPT(or the gas flow at the outlet of the main gas pipeline QOcompared with the desired gas flow at the outlet of the main gas pipeline QOPT).
5. Register control signals to increase or decrease gas pressure at the outlet of the COP issued arranged below in the direction of gas adjacent the COP, and turned off the blower.
6. Control actions performed on each of the i-th CS (i=1; 2; 3;...; N-1), except the last N - allowable compression ratio and maximum permissible pressures at inlet and outlet. If necessary, reducing the pressure of the gas at the outlet of the COP is consistent with its predominant implementation by reducing the degree of compression compressors COP. If necessary, increase the pressure of the gas at the outlet of the COP is consistent with its predominant implementation through simultaneous growth of input and output pressures without changing the mode or degree of compression compressors COP due to growth in output pressure with increasing compression blowers from the previous COP, for which the input pressure is fixed, for example, because it is for the gas pipeline first and has the specified inlet pressure or because the output pressure of the previous COP has the maximum value. Specific management actions must meet the guidelines described in the table.1.
7. The last N-th COP should be aimed at ensuring the gas pressure POequal to POPTwith minimal compression blowers. Specific management actions implemented on the N-th COP, depending on the registered settings with regard to the priorities referred to in paragraph 6 shall meet the recommendations predstavliati compression and the average temperature on p. 2, to compare the data obtained in accordance with PP 3 and 4, register control signals on p. 5 and Refine management actions according to PP 6 and 7.
If the task Manager at the outlet of the main gas pipeline it is necessary to maintain the equality QOand QOPTand not POand POPTabove the control actions are the same.
The proposed method is easy to implement using existing transmission pipelines systems power automation that supports the outlet pressure of the compressor is equal to the specified value. Although in this case, as formally regulated value is used, the outlet pressure of the blower COP, however, the actual controlled variable is the compression ratio of the supercharger, because this value is crucial for the regulation. At the same time from the aggregate system automation can be obtained for the implementation of the proposed method the data for the maximum and minimum degrees of compression blowers, taking into account the limit values for the maximum and minimum volume of their performance, drive power, the permissible throttle frequent the signal is corresponding signal, obtained from the aggregate system automation for any fan of the group.
The signals on the limitation of operational parameters of the compressors can be formed without the use of aggregate systems automation, if generated according to the proposed method the control system will be established individually combined gas-dynamic characteristics of the compressors COP with indication of the boundaries of acceptable operating parameters. The position of the operating points of the blowers on the characteristics of the installed conventional methods directly on measured parameters (costs, compression ratio, speed, temperature).
The analysis of the level of technology has allowed to establish that the applicant is not detected similar, characterized by signs, identical to all the essential features of the claimed invention, therefore, it meets the criterion of “novelty.”
An example implementation of the proposed method of regulation of the main pipeline and its advantages in comparison with the method, recommending the operation of the blowers COP at maximum output pressure gas, as well as traditionally used in the present method, Comair does not exceed the restriction of the output pressure. Comparison with the method for adjustment in the patent SU # 1755000, is impossible, since there are no guidelines for its use when the differences in the maximum allowable pressure on individual sections of the pipeline.
Considered the main gas pipeline from pipe Dy=1400 mm without limit selections containing 5 CC (N=5) sections of pipelines after them. In all areas is transported by the same natural gas consumption QOPT=1040 nm3/s (mass flow rate of 695 kg/s) at an average temperature of 285 K. Polytropic efficiency compressors COP adopted equal to 0.8. To exclude consideration of selection of gas for own needs of the COP, no significant impact on the results obtained, adopted the option of using electrically driven compressors with variable speed. The absolute gas pressure at the entrance to the pipeline PIand required for the transportation of the specified gas flow pressure at the outlet of the pipeline POPTequal to 5.5 MPa. The maximum allowable absolute pressure of gas for gas pipeline sections 1, 3 and 5 is 7.6 MPa, for sections of the pipeline 2 and 4 it is reduced to 7.0 MPa, and in other areas of the pipeline and compressors COP identify the different gas pressures (input COP 5.5 MPa, the output - 6,97 MPa) using the same degrees of compression compressors COP equal to 1.27. The total capacity of compression in this case is 139,4 MW (taken as 100%).
CW operation with a maximum output pressure of the gas increases the total capacity of the compression up to USD 151.6 MW (108,8%). This is because when the maximum permissible pressures at the outlets of the blowers KS-1 and KS-3, equal to 7.6 MPa, the transport gas may be carried out only when the blower KS-2 and KS-4, because when created in these conditions at the inputs of KS-2 and KS-4 the pressure of 6.3 MPa operation of the blowers KS-2 and KS-4 with an output pressure of 7.0 MPa is possible only if the degree of compression below the minimum, equal to 1.2.
Mutual distribution of the degrees of compression of the COP recommended in accordance with the proposed method of regulation of the main pipeline, reduces total power compression to 133,0 MW (95.4 percent).
More detailed numerical data of the example implementation presented below in table.3.
Thus, the proposed method of control of the main gas pipeline allows to ensure the transport of gas minimum total capacity of compressor stations to minimize the energy consumption for the transportation of gas.
Comparison of the essential features of the proposed and known ways of regulating the main pipeline gives reason to believe that the proposed method meets the criteria of “inventive step” and “industrial applicability”.
1. DOBROKHOTOV C. D. Centrifugal blowers natural gas. M.: Nedra, 1972, pp. 9-14.
2. TEMPEL, F. G., MASLOV A. MT Technology mode gaspereau. Leningrad: Nedra (Leningrad. div.), 1974, pp. 37, 38.
3. MATVEEV centuries the Method of regulation of a gas pipeline (patent SU # 1755000, CL F 17 D 1/00, priority dated November 25, 1987).
Method of control of technological parameters of the existing gas main on separate sites which during operation permissible gas pressure is reduced from the nominal design values, using as the main regulated value of the compression ratio of the supercharger compressor station consisting in measuring the parameters of the transported gas, determining the actual values of controlled variables and parameters of operation of the blowers, comparing them with valid values and the adjustment of the operating compressors compressor stations, characterized in that the primary work of blowers with minimum compression and maximum permissible pressures at inlet and outlet, the choice of modes of operation of the blowers are subject to margins of operational parameters, determined using a combined gas-dynamic characteristics of the blower.
FIELD: pipeline transport.
SUBSTANCE: power plant is additionally provided with a turbine expander provided with an electric generator. Power generated by the steam plant is directed to the main gas pipeline, and a part of power is directed to the turbine expander with electric generator to produce electric power.
EFFECT: enhanced reliability and efficiency.
1 cl, 1 dwg
FIELD: pipeline transport.
SUBSTANCE: method comprises intensifying extraction of low-pressure gas in tanks of oil stabilization due to rarefying gas in the inlet gas collector that connects the tank with the inlet of liquid-gas jet compressors by mixing the pumping product with active agent and increasing initial pressure of the low-pressure gas up to the pressure required by a consumer with simultaneous condensation of C5+ fraction. The gas-liquid mixture is supplied to the air cooling apparatus. After the separation of gas from the active agent, purifying and drying the compressed gas is intensified by supplying the compressed gas into the vortex pipe and, then, to the consumer.
EFFECT: improved method.
FIELD: oil and gas industry.
SUBSTANCE: device comprises device for enhancing and reducing pressure, receiving gas line for supplying the plant with the gas, discharging gas line through which the gas after purification is supplied from the plant, two vortex pipes, ejector, and condensate collector. The inlet of the first vortex pipe is connected with the receiving gas line and outlet of the cold gas flow of the second vortex pipe through the device for enhancing or reducing pressure. The output of the hot flow of the first vortex pipe is connected with the inlet of the first separator through the ejector, and the condensate outlet of the separator is connected with the inlet of the second vortex pipe. The outlet of the cold flow of the second vortex pipe is connected with the receiving gas.
EFFECT: enhanced quality of purification.
1 cl, 1 dwg
FIELD: preparation and transportation of petroleum associated and natural gases.
SUBSTANCE: invention relates to preparation of gas for transportation along gas pipeline and separation of heavy fraction condensate from gas. Proposed plant for preparation of petroleum associated gas or natural gas for transportation along gas pipeline and obtaining of liquid hydrocarbons from gas intake line, device to increase and decrease pressure, gas flow line, liquid hydrocarbons extraction line, three-circuit heat exchanger, separator, expansion valve, two regulating valves and swirl pipe whose input is connected through pressure increasing and decreasing device from one side with inlet gas line through first regulating valve and through series-connected second regulating valve and first circuit of heat exchanger, and from other side, with output of expansion valve. Output of cold flow of swirl pipe is connected through second circuit of heat exchangers with gas flow line, output of hot flow of swirl pipe is connected through third circuit of heat exchanger with input of separator whose condensate output is connected with line to remove liquid hydrocarbons, and gas output, with input of expansion valve.
EFFECT: increased degree of separation of condensate of heavy fractions of hydrocarbons from petroleum associated gas or natural gas designed for transportation along gas pipeline.
FIELD: the invention refers to energy-conservation technologies of pipeline transportation of natural gas.
SUBSTANCE: it may be used for controlling the technological process of the main pipeline with simultaneous selection out of gas of valuable ethane, propane, butane components. The technical result of the invention is reduction of energy inputs for maintaining pressure in the main pipeline, provision of stabilization of pressure in the main pipeline. The mode of transportation of natural gas along the main pipeline includes its feeding into the main pipeline on the first and the following compressor stations and giving out natural gas from the main pipeline through gas reducing stations and divide it on two flows one of them is directed into the pipeline of high pressure, and the other into a consumer pipe-bend. At that the gas of consumer pipe-bend is preliminary cooled and cleared from condensed and hard fraction, and then further cooling is executed till the temperature below the point of condensation of methane and division of cryogenic liquid and directed to the user, and out of received cryogenic liquid methane is separated from liquid ethane-propane-butane fraction which is returned into the pipeline of high pressure and further into the main pipeline, and detailed methane is directed into the pipe-bend. At that the gas in the pipeline of high pressure is preliminary additionally cooled, compremirated and returned into the main pipeline.
EFFECT: reduces power inputs.
7 cl, 1 dwg
FIELD: storage or transporting of natural gas.
SUBSTANCE: method comprises cooling natural gas down to a temperature below the temperature of the ambient air and transporting the cooled natural gas.
EFFECT: enhanced efficiency of storage and transporting.
16 cl, 13 dwg
FIELD: gas industry.
SUBSTANCE: method comprises separating the mixture into C1 methane fraction with subsequent supply to gas pipeline and C2+ hydrocarbon fraction that are preliminary stabilized by its liquefying by means of preliminary cooling down to a temperature at least 16°C and supplying to the gas pipeline. The pressure is maintained at a level no less than 3,2 MPa.
EFFECT: enhanced reliability of one-phase transporting.
FIELD: oil industry.
SUBSTANCE: supersonic tube comprises Laval nozzle, cyclonic separator with the blade, diffuser for discharging dried gas, and diffuser for discharging condensed liquid. The blade is made of deformed plate set in the screw groove made in the inner side of the cyclonic separator. The length of the plate is at least ½ of the pitch of the screw groove. The housing of the tube of the cyclonic separator receives locking members whose faces enters the screw groove. The distance between the adjacent locking members mounted in the screw groove is equal to the length of the plate.
EFFECT: enhanced efficiency.
FIELD: natural gas industry; other industries; production of the gas pipeline blowoff valves.
SUBSTANCE: the invention is pertaining to natural gas industry and is intended for blowing through of the gas pipelines. The technical result of the invention is the increased efficiency of usage of the gas pipeline blowoff valves at augmentation of the quantity of the delivered for utilization of the waste heavy hydrocarbon fractions of the natural gas for their additional condensation in the area of formation of the microswirlings between the exterior funnel-shaped and interior perforated conical walls. In the gas pipeline blowoff valve in the holes of the perforated conical wall there are the curvilinear grooves, which curvature is directed counterclockwise, and the curvature of the guiding vanes is made in the clockwise direction.
EFFECT: the invention ensures the increased efficiency of usage of the gas pipeline blowoff valves.
FIELD: gas conveyance means, particularly gas-main lines, gathering lines and manifolds of gas fields for condensate recovery.
SUBSTANCE: device to prevent condensate plug forming in pipeline comprises pipeline with inclined sections and connection elbows with enclosing channel. Discharge condensate pipe is formed in lower part of connection elbow. Condensate pipe is located in funnel-shaped enclosing channel and is connected to accumulation vessel located below ground freezing level. Condensate removal pipeline is installed in accumulation vessel so that the condensate removal pipeline is coaxially retained in vertical enclosing channel.
EFFECT: possibility to maintain thermal gas pipeline regime, which prevents condensate freezing, to remove accumulated condensate due to usage of steam condensation heat generated during condensation of steam present in conveying gas flow.