CN209909562U - System for be used for retrieving compressor station unloading natural gas - Google Patents
System for be used for retrieving compressor station unloading natural gas Download PDFInfo
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- CN209909562U CN209909562U CN201920261345.0U CN201920261345U CN209909562U CN 209909562 U CN209909562 U CN 209909562U CN 201920261345 U CN201920261345 U CN 201920261345U CN 209909562 U CN209909562 U CN 209909562U
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Abstract
The utility model discloses a system for be used for retrieving air compressor station unloading natural gas belongs to natural gas recovery technical field. The system comprises: the system comprises a multi-level gas power compressor, a gas reciprocating compressor and a controller. This practical novel cooperation through multistage gas power compressor and gas reciprocating compressor to utilize the controller to control first solenoid valve, second solenoid valve, third solenoid valve, fourth solenoid valve, fifth solenoid valve, sixth solenoid valve, the opening and closing of seventh solenoid valve based on the testing result that first pressure sensor, second pressure sensor, third pressure sensor transmitted, can carry out effective pressure boost to the gas of different pressures, different capacities that are discharged by the air release end of pipeline compressor in time, make the pressure after its pressure boost reach the requirement of predetermined recoverable pressure, improve the rate of recovery of air station air release natural gas.
Description
Technical Field
The utility model relates to a natural gas recovery technical field, in particular to a system for be used for retrieving gas station unloading natural gas.
Background
In the service process of the natural gas long-distance pipeline, the natural gas in the pipeline compressor needs to be emptied regularly for maintenance. To avoid waste of the vent gas and environmental pollution caused by discharge to the atmosphere, it is necessary to recover the vent gas. Wherein, the pipeline compressor is provided with an air inlet end communicated with an upstream pipeline, an air outlet end communicated with a downstream pipeline and an emptying end.
At present, a reciprocating compressor is arranged between an emptying end and an air inlet end of a pipeline compressor to perform pressurization and returning.
Designers have found that the prior art suffers from at least the following problems:
not only can the reciprocating compressor not effectively pressurize the lower pressure natural gas (e.g., less than 4 mpa), resulting in reduced recovery of the vented natural gas, but the reciprocating compressor also cannot effectively pressurize the vented natural gas when the amount of vented natural gas is less than the pressurization capacity of the reciprocating compressor.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a system for retrieving air station unloading natural gas can solve above-mentioned problem. The technical scheme is as follows:
a system for recovering compressed gas station vent natural gas, the system comprising: the system comprises a multi-level gas power compressor, a gas reciprocating compressor and a controller;
the high-pressure air inlet end of the first-level gas power compressor is communicated with the air outlet end of the pipeline compressor through a first pipeline, the low-pressure air inlet end of the first-level gas power compressor is communicated with the air outlet end of the pipeline compressor through a second pipeline, and the air outlet end of the first-level gas power compressor is communicated with the air inlet end of the pipeline compressor through a third pipeline;
the high-pressure air inlet end of the last-level gas power compressor is communicated with the air outlet end of the pipeline compressor through a fourth pipeline, and the air outlet end of the last-level gas power compressor is communicated with the air inlet end of the pipeline compressor through a fifth pipeline;
the low-pressure gas inlet end of the gas power compressor at the rest level is communicated with the gas outlet end of the gas power compressor at the adjacent upstream level through a sixth pipeline, the high-pressure gas inlet end is communicated with the gas outlet end of the pipeline compressor through a seventh pipeline, the first gas outlet end is communicated with the low-pressure gas inlet end of the gas power compressor at the adjacent downstream level through an eighth pipeline, and the second gas outlet end is communicated with the gas inlet end of the pipeline compressor through a ninth pipeline;
the gas inlet end of the gas reciprocating compressor is communicated with the gas outlet end of the pipeline compressor through a tenth pipeline, and the gas outlet end of the gas reciprocating compressor is communicated with the high-pressure gas inlet end of the last-level gas power compressor through an eleventh pipeline;
a first electromagnetic valve and a first pressure sensor are sequentially arranged on the third pipeline along the air flow direction, a second electromagnetic valve is arranged on the fourth pipeline, a third electromagnetic valve is arranged on the sixth pipeline, a fourth electromagnetic valve is arranged on the eighth pipeline, a fifth electromagnetic valve and a second pressure sensor are sequentially arranged on the ninth pipeline along the air flow direction, a sixth electromagnetic valve is arranged on the tenth pipeline, a seventh electromagnetic valve is arranged on the seventh pipeline, and a third pressure sensor is arranged on the fifth pipeline;
the controller is electrically coupled to the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, the sixth solenoid valve, the seventh solenoid valve, the first pressure sensor, the second pressure sensor, and the third pressure sensor at the same time;
the controller is a programmable logic controller with redundant configuration.
In one possible design, the multi-stage gas dynamic compressor has a stage of 2.
In one possible design, each of the multi-stage gas dynamic compressors comprises: the device comprises a body with a three-way structure, a buffer shell positioned in the body, a spray gun and a nozzle connected with the spray gun;
the body is provided with a high-pressure air inlet end with gradually-reduced inner diameter, an air outlet end with gradually-increased inner diameter and a low-pressure air inlet end with equal diameter, and the high-pressure air inlet end, the air outlet end, the buffer shell, the spray gun and the spray nozzle are coaxially arranged;
the opening end of the buffer shell is distributed facing the high-pressure air inlet end, the closed end of the buffer shell is provided with a first through hole communicated with the air outlet end, and the side wall of the buffer shell is provided with a plurality of second through holes communicated with the low-pressure air inlet end;
the nozzle penetrates through the high-pressure air inlet end and is fixed in the buffer shell;
the inner diameters of the nozzle and the spray gun are gradually reduced according to the air inlet direction;
the minimum inner diameter of the nozzle, the aperture of the first through hole and the maximum diameter of the air outlet end are sequentially increased.
In one possible embodiment, the system further comprises: and the high-pressure gas storage tank is arranged on the tenth pipeline and is positioned between the gas outlet end of the gas reciprocating compressor and the second electromagnetic valve.
In one possible embodiment, the system further comprises: the eighth electromagnetic valve is arranged on the tenth pipeline and is positioned between the gas outlet end of the gas reciprocating compressor and the high-pressure gas storage tank;
the eighth solenoid valve is electrically coupled to the controller.
In one possible embodiment, a first valve is arranged on the first line;
and a second valve is arranged on the second pipeline.
In one possible embodiment, the first valve and the second valve are ball valves.
In one possible embodiment, the gas reciprocating compressor is a liquefied natural gas reciprocating compressor.
In one possible embodiment, the gas reciprocating compressor is an electrically driven reciprocating compressor.
In one possible design, the low-pressure inlet end of the first stage of the gas-powered compressor is also in communication with an auxiliary conduit in the compressor station.
The embodiment of the utility model provides a beneficial effect that technical scheme brought includes at least:
the embodiment of the utility model provides a system for retrieving air station evacuation natural gas, cooperation through multistage gas power compressor and gaseous reciprocating compressor, and utilize the controller to control first solenoid valve based on first pressure sensor, second pressure sensor, the testing result that third pressure sensor transmitted, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, the sixth solenoid valve, the open and close of seventh solenoid valve, can carry out effective pressure boost to the gas of different pressures, different capacities that is discharged by the evacuation end of pipeline compressor in time, the pressure after making its pressure boost reaches the requirement of predetermined recoverable pressure, improve the rate of recovery of air station evacuation natural gas; in addition, the controller is set to be a programmable logic controller with a redundant configuration, so that the influence on the operation reliability of the system when the controller fails can be reduced, and the opening and closing of the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the sixth electromagnetic valve and the seventh electromagnetic valve can be effectively controlled according to the detection results transmitted by the first pressure sensor, the second pressure sensor and the third pressure sensor.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a block diagram of a system for recovering compressed natural gas from a compressor plant having a number of stages 3 for a multi-stage gas dynamic compressor according to an embodiment of the present invention;
FIG. 2 is a block diagram of a system for recovering compressed natural gas from a compressor plant having a number of stages 2 for a multi-stage aerodynamic compressor according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a gas dynamic compressor according to an embodiment of the present invention.
Wherein the various reference numbers in the drawings are described below:
1-a multi-stage gas-powered compressor;
1 a-a first stage aerodynamic compressor;
1 b-a last stage of a gas-powered compressor;
1 c-a residual grade gas dynamic compressor;
11-body, 111-high pressure inlet end, 112-outlet end, 113-low pressure inlet end;
12-buffer housing, 121-first through hole, 122-second through hole;
13-a spray gun;
14-a nozzle;
15-pressing cover;
2-gas reciprocating compressor;
3 a-a first pipeline, 3 b-a second pipeline, 3 c-a third pipeline, 3 d-a fourth pipeline, 3 e-a fifth pipeline, 3 f-a sixth pipeline, 3 g-a seventh pipeline, 3 h-an eighth pipeline, 3 i-a ninth pipeline, 3 j-a tenth pipeline, 3 k-an eleventh pipeline;
4 a-a first solenoid valve, 4 b-a second solenoid valve, 4 c-a third solenoid valve, 4 d-a fourth solenoid valve, 4 e-a fifth electro-valve, 4 f-a sixth solenoid valve, 4 g-a seventh solenoid valve, 4 h-an eighth solenoid valve;
5 a-a first pressure sensor, 5 b-a second pressure sensor, 5 c-a third pressure sensor;
6-high pressure gas storage tank;
7 a-the first valve, 7 b-the second valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
In addition, the pipeline compressor a according to the embodiment of the present invention is installed between the upstream pipeline and the downstream pipeline, and pressurizes the natural gas in the upstream pipeline so that the natural gas in the upstream pipeline can smoothly flow into the downstream pipeline.
The embodiment of the utility model provides a system for retrieving air station unloading natural gas, as shown in figure 1, this system includes: the system comprises a multi-level gas power compressor 1, a gas reciprocating compressor 2 and a controller;
the high-pressure air inlet end of the first-level gas power compressor 1a is communicated with the air outlet end of the pipeline compressor A through a first pipeline 3a, the low-pressure air inlet end is communicated with the air outlet end of the pipeline compressor A through a second pipeline 3b, and the air outlet end is communicated with the air inlet end of the pipeline compressor A through a third pipeline 3 c;
the high-pressure air inlet end of the last-level gas power compressor 1b is communicated with the air outlet end of the pipeline compressor A through a fourth pipeline 3d, and the air outlet end is communicated with the air inlet end of the pipeline compressor A through a fifth pipeline 3 e;
the low-pressure gas inlet end of the gas power compressor 1c at the rest level is communicated with the gas outlet end of the gas power compressor at the upstream adjacent level through a sixth pipeline 3f, the high-pressure gas inlet end is communicated with the gas outlet end of the pipeline compressor A through a seventh pipeline 3g, the first gas outlet end is communicated with the low-pressure gas inlet end of the gas power compressor at the downstream adjacent level through an eighth pipeline 3h, and the second gas outlet end is communicated with the gas inlet end of the pipeline compressor A through a ninth pipeline 3 i;
the gas inlet end of the gas reciprocating compressor 2 is communicated with the gas outlet end of the pipeline compressor A through a tenth pipeline 3j, and the gas outlet end is communicated with the high-pressure gas inlet end of the last-level gas power compressor 1b through an eleventh pipeline 3 k;
a first electromagnetic valve 4a and a first pressure sensor 5a are sequentially arranged on the third pipeline 3c along the airflow direction, a second electromagnetic valve 4b is arranged on the fourth pipeline 3d, a third electromagnetic valve 4c is arranged on the sixth pipeline 3f, a fourth electromagnetic valve 4d is arranged on the eighth pipeline 3h, a fifth electromagnetic valve 4e and a second pressure sensor 5b are sequentially arranged on the ninth pipeline 3i along the airflow direction, a sixth electromagnetic valve 4f is arranged on the tenth pipeline 3j, a seventh electromagnetic valve 4g is arranged on the seventh pipeline 3g, and a third pressure sensor 5c is arranged on the fifth pipeline 3 e;
the controller is electrically coupled with the first solenoid valve 4a, the second solenoid valve 4b, the third solenoid valve 4c, the fourth solenoid valve 4d, the fifth solenoid valve 4e, the sixth solenoid valve 4f, the seventh solenoid valve 4g, the first pressure sensor 5a, the second pressure sensor 5b and the third pressure sensor 5 c;
the controller is a programmable logic controller with redundant configuration.
The multi-stage gas dynamic compressor 1 may have a plurality of stages, for example, 2 stages, 3 stages, 4 stages, and the like. When the multi-stage gas dynamic compressor 1 is of stage 2, the multi-stage gas dynamic compressor 1 comprises two gas dynamic compressors; when the multi-stage gas dynamic compressor 1 has a stage 3, the multi-stage gas dynamic compressor 1 comprises three gas dynamic compressors.
The working principle of the system for recovering compressed natural gas discharged from a compressed gas station, the system being provided by the embodiment of the invention and having the number of levels of 3, is described as follows:
when recovering the low-pressure gas (for example, the pressure is less than 4 mpa) discharged from the blow-down end of the pipeline compressor a, the low-pressure gas enters the interior of the first-stage aerodynamic compressor 1a from the low-pressure gas inlet end of the first-stage aerodynamic compressor 1a and is mixed with the high-pressure gas discharged from the gas outlet end of the pipeline compressor a. The gas pressure at the gas outlet end of the first-stage aerodynamic compressor 1a is detected by the first pressure sensor 5a, and the detection result is transmitted to the controller.
If the pressure of the mixed gas is greater than or equal to the preset recoverable pressure (for example, greater than 2 MPa), the controller opens the first electromagnetic valve 4a, and closes the third electromagnetic valve 4c, so that the mixed gas consisting of the high-pressure gas discharged from the gas outlet end of the pipeline compressor A and the low-pressure gas discharged from the gas outlet end of the pipeline compressor A flows into the gas inlet end of the pipeline compressor A through the gas outlet end of the first-level aerodynamic compressor 1a for recycling.
And if the pressure of the mixed gas is less than the preset recoverable pressure, the controller closes the first electromagnetic valve 4a, opens the third electromagnetic valve 4c and the seventh electromagnetic valve 4g, so that the mixed gas enters the second-level gas power compressor 1c from the low-pressure gas inlet end of the second-level gas power compressor 1c and is mixed with the high-pressure gas discharged from the gas outlet end of the pipeline compressor A again. The gas pressure at the gas outlet end of the second-stage aerodynamic compressor 1c is detected by the third pressure sensor 5c, and the detection result is transmitted to the controller.
If the pressure of the mixed gas is greater than or equal to the predetermined recoverable pressure (for example, greater than 2 mpa), the controller opens the fifth solenoid valve 4e, and closes the fourth solenoid valve 4d, so that the mixed gas flows into the gas inlet end of the pipeline compressor a for recycling.
And if the pressure of the mixed gas is less than the preset recoverable pressure, the controller closes the fifth electromagnetic valve 4e, opens the fourth electromagnetic valve 4d and the second electromagnetic valve 4b, so that the mixed gas enters the last-level gas power compressor 1b from the gas outlet end of the second-level gas power compressor 1c and is mixed with the high-pressure gas discharged from the gas outlet end of the pipeline compressor A again. The gas pressure at the gas outlet end of the last stage of the aerodynamic compressor 1b is detected by the second pressure sensor 5b and the detection result is transmitted to the controller.
If the pressure of the mixed gas is greater than or equal to the preset recoverable pressure (for example, greater than 2 MPa), the mixed gas flows into the gas inlet end of the pipeline compressor A for recycling.
If the pressure of the mixed gas is still less than the predetermined recoverable pressure, the controller opens the sixth electromagnetic valve 4f to allow the high-pressure gas discharged from the gas outlet end of the pipeline compressor a to flow into the gas reciprocating compressor 2 for pressurization. The pressurized gas flows into the high-pressure gas inlet end of the last-level gas power compressor 1b, is mixed with the low-pressure mixed gas flowing out of the second-level gas power compressor 1c, the pressure of the vent natural gas flowing into the gas inlet end of the pipeline compressor A is increased, and then the mixed gas flows into the gas inlet end of the pipeline compressor A for recycling.
If the controller fails to effectively control the opening and closing of the first solenoid valve 4a, the second solenoid valve 4b, the third solenoid valve 4c, the fourth solenoid valve 4d, the fifth solenoid valve 4e, the sixth solenoid valve 4f and the seventh solenoid valve 4g according to the detection results transmitted by the first pressure sensor 5a, the second pressure sensor 5b and the third pressure sensor 5c during the operation process, at this time, the redundant configuration in the controller intervenes and undertakes the operation of the failed component, thereby reducing the influence on the operation reliability of the system when the controller fails.
It can be seen that the embodiment of the utility model provides a system for retrieving atmospheric natural gas of compressor station, through the cooperation of multistage gas power compressor 1 with gas reciprocating compressor 2, and utilize the controller to control the opening and closing of first solenoid valve 4a, second solenoid valve 4b, third solenoid valve 4c, fourth solenoid valve 4d, fifth solenoid valve 4e, sixth solenoid valve 4f, seventh solenoid valve 4g based on the testing result that first pressure sensor 5a, second pressure sensor 5b, third pressure sensor 5c transmitted, can effectively pressurize to the gas of different pressures, different capacities that is discharged by the atmospheric end of pipeline compressor A in time, make the pressure after its pressurization reach the requirement of predetermined recoverable pressure, improve the rate of recovery that atmospheric natural gas was let out to the compressor station; in addition, by providing the controller as a programmable logic controller having a redundant configuration, the influence on the system operation reliability in the event of a failure of the controller can be reduced, and the opening and closing of the first solenoid valve 4a, the second solenoid valve 4b, the third solenoid valve 4c, the fourth solenoid valve 4d, the fifth solenoid valve 4e, the sixth solenoid valve 4f, and the seventh solenoid valve 4g can be controlled effectively based on the detection results transmitted from the first pressure sensor 5a, the second pressure sensor 5b, and the third pressure sensor 5 c.
In the application process, since the pressure of the gas discharged from the discharge end of the pipeline compressor A is 0.3 MPa, the preset recovery pressure is 0.3 MPa, the supercharging capacity (namely the supercharging multiple) of each grade of gas power compressor is 8 times, the supercharging capacity (namely the supercharging multiple) of the gas reciprocating compressor 2 is 2.8 times, and the cooperation of the gas reciprocating compressor 2 and the two-grade gas power compressor (namely comprising 2 gas power compressors) can increase the pressure of the gas discharged from the pipeline supercharger A to the recovery pressure. In view of the cost, in the embodiment of the present invention, as shown in fig. 2, the multi-stage gas dynamic compressor 1 has a stage 2.
With regard to the structure of each of the stages of the gas dynamic compressor 1, the embodiment of the present invention provides an example, as shown in fig. 3, in which each stage of the gas dynamic compressor includes: the three-way structure comprises a body 11 with a three-way structure, a buffer shell 12 positioned in the body 11, a spray gun 13 and a nozzle 14 connected with the spray gun 13; the body 11 is provided with a high-pressure air inlet end 111 with gradually reduced inner diameter, an air outlet end 112 with gradually increased inner diameter and a low-pressure air inlet end 113 with equal diameter; the high-pressure air inlet end 111, the air outlet end 112, the buffer shell 12, the spray gun 13 and the nozzle 14 are coaxially arranged; the open end of the buffer shell 12 faces the high-pressure air inlet end 111 and is distributed, the closed end is provided with a first through hole 121 communicated with the air outlet end 112, and the side wall is provided with a plurality of second through holes 122 communicated with the low-pressure end; the nozzle 14 is positioned in the buffer shell 12 through the high-pressure air inlet end 111; the inner diameters of the nozzle 14 and the spray gun 13 are gradually reduced according to the air inlet direction; the minimum inner diameter of the nozzle 14, the aperture of the first through hole 121 larger than and the maximum diameter of the outlet port 112 are increased in this order.
Through setting up as above, can not consume external power, alright effectively utilize high-pressure gas to draw to penetrate low-pressure gas, the energy that make full use of blow-down gas body 11 has compresses the recovery, reduces the running cost.
The following description is given of the operating principle of the gas dynamic compressor constructed as above:
high-pressure gas enters the spray gun 13 through the high-pressure gas inlet end 111 of the body 11, negative pressure is formed in the buffer shell 12 around the injection port of the nozzle 14, at the moment, low-pressure gas enters the buffer shell 12 through the low-pressure gas inlet end 113 of the body 11 and the second through hole 122 in the buffer body 11 in sequence, the low-pressure gas is fully mixed with the high-pressure gas, and then the mixed gas passes through the first through hole 121 of the buffer shell 12 and is discharged from the gas outlet end 112 of the body 11.
The embodiment of the present invention provides an example of a fixing mode of the buffer housing 12 in the body 11, wherein an annular clamping groove is provided on an inner wall of the body 11, and the annular clamping groove is used for abutting against a first end surface of the buffer housing 12, which is far away from the high-pressure air inlet 111; the gas dynamic compressor further comprises: and the gland 15 is connected with the body 11 and abuts against a second end face, close to the high-pressure air inlet end 111 of the body 11, in the buffer shell 12.
It will be appreciated that in order to ensure that high pressure gas can smoothly enter the lance 13 through the high pressure inlet end 111 of the body 11, the gland 15 is provided with a high pressure inlet end 111.
The gland 15 can be connected with the body 11 in a threaded manner, so that the buffer shell 12 and the gland 15 can be conveniently detached and replaced. Specifically, the outer wall of the gland 15 may be provided with threads, and the inner wall of the body 11 may be provided with threads matching the threads on the gland 15.
Further, the spray gun 13 can be in threaded connection with the inner wall of the gland 15, and the nozzle 14 can also be in threaded connection with the spray gun 13, so that the nozzle 14 with different sizes can be replaced conveniently.
Specifically, the outer wall of the spray gun 13 is provided with threads matched with the threads of the gland 15, the inner wall of the spray gun 13 is provided with threads, and the outer wall of the spray nozzle 14 is provided with threads matched with the threads of the inner wall of the spray nozzle 14.
In order to improve the gas pressure at the gas outlet end of the last level gas power compressor 1b by using the gas reciprocating compressor 2 in time, as shown in the attached drawing 1, in the embodiment of the present invention, the system further includes: and a high pressure gas tank 6 provided on the tenth pipeline 3j and located between the gas outlet end of the gas reciprocating compressor 2 and the second solenoid valve 4 b.
With this arrangement, the high-pressure gas tank 6 can temporarily store the high-pressure gas flowing into the gas power compressor 1b of the last stage.
Further, in order to facilitate the maintenance of the high-pressure gas storage tank 6, as shown in fig. 1, in an embodiment of the present invention, the system further includes: an eighth solenoid valve 4h disposed on the tenth pipeline 3j and located between the gas outlet end of the gas reciprocating compressor 2 and the high pressure gas tank 6; the eighth solenoid valve 4h is electrically coupled to the controller.
Through such setting, when overhauing high pressure gas holder 6, can utilize the controller to close second solenoid valve 4b, eighth solenoid valve 4h earlier, then dismantle high pressure gas holder 6 from tenth pipeline 3j, maintain.
Similarly, in order to facilitate the maintenance of the first-stage aerodynamic compressor 1a, in the embodiment of the present invention, as shown in fig. 1, a first valve 7a is disposed on the first pipeline 3 a; a second valve 7b is provided on the second line 3 b.
With the above arrangement, when the first-stage gas dynamic compressor 1a is to be serviced, the first valve 7a and the second valve 7b may be closed.
The first valve 7a and the second valve 7b are ball valves, and the first valve 7a and the second valve 7b are easy to obtain and low in cost.
As an example, in the embodiment of the present invention, the gas reciprocating compressor 2 may be a liquefied natural gas reciprocating compressor. The gas reciprocating compressor 2 has strong pressurization capacity, and can pressurize gas by 2.8 times, for example, the gas pressure can be increased from 4 MPa to 11.2 MPa by using the liquefied natural gas reciprocating compressor.
As an example, in the embodiment of the present invention, the gas reciprocating compressor 2 may also be an electric reciprocating compressor. The gas reciprocating compressor 2 is convenient to obtain and low in price.
In the pressure station, downstream lines are usually connected to auxiliary lines, for example, lines for tapping, lines for metering. When the pipeline compressor A is overhauled, the gas in the auxiliary pipeline is also emptied to ensure the safe operation of the overhaul.
In order to avoid the waste of the above-mentioned gas, in the embodiment of the utility model, the inlet end of the first-level gas power compressor 1a still communicates with the auxiliary pipeline in the compressor station to install the check valve additional on the pipeline of different unloading pressure grades, prevent that the phenomenon of getting rid of gas appears empting.
Through such setting, can retrieve the gas that the end of emptying of pipeline compressor A discharged, also can retrieve the gas that auxiliary line discharged, can enlarge the application range of this system, can improve the economic benefits of this system.
To sum up, the embodiment of the utility model provides a system not only can effectively retrieve different pressure, the gas of different capacity, has recovery efficiency height, and the characteristics that the recovery ability is strong can also improve economic benefits and application range moreover.
All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.
The above description is only illustrative of the present invention, and should not be taken as limiting the scope of the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A system for recovering compressed natural gas from a compressor station, the system comprising: the device comprises a multi-level gas power compressor (1), a gas reciprocating compressor (2) and a controller;
the high-pressure air inlet end of the first-level gas power compressor (1a) is communicated with the air outlet end of the pipeline compressor (A) through a first pipeline (3a), the low-pressure air inlet end is communicated with the emptying end of the pipeline compressor (A) through a second pipeline (3b), and the air outlet end is communicated with the air inlet end of the pipeline compressor (A) through a third pipeline (3 c);
the high-pressure air inlet end of the last-level gas power compressor (1b) is communicated with the air outlet end of the pipeline compressor (A) through a fourth pipeline (3d), and the air outlet end of the last-level gas power compressor is communicated with the air inlet end of the pipeline compressor (A) through a fifth pipeline (3 e);
the low-pressure gas inlet end of the gas power compressor (1c) at the rest level is communicated with the gas outlet end of the gas power compressor at the adjacent level at the upstream through a sixth pipeline (3f), the high-pressure gas inlet end is communicated with the gas outlet end of the pipeline compressor (A) through a seventh pipeline (3g), the first gas outlet end is communicated with the low-pressure gas inlet end of the gas power compressor at the adjacent level at the downstream through an eighth pipeline (3h), and the second gas outlet end is communicated with the gas inlet end of the pipeline compressor (A) through a ninth pipeline (3 i);
the gas inlet end of the gas reciprocating compressor (2) is communicated with the gas outlet end of the pipeline compressor (A) through a tenth pipeline (3j), and the gas outlet end is communicated with the high-pressure gas inlet end of the last-level gas power compressor (1b) through an eleventh pipeline (3 k);
a first electromagnetic valve (4a) and a first pressure sensor (5a) are sequentially arranged on the third pipeline (3c) along the airflow direction, a second electromagnetic valve (4b) is arranged on the fourth pipeline (3d), a third electromagnetic valve (4c) is arranged on the sixth pipeline (3f), a fourth electromagnetic valve (4d) is arranged on the eighth pipeline (3h), a fifth electromagnetic valve (4e) and a second pressure sensor (5b) are sequentially arranged on the ninth pipeline (3i) along the airflow direction, a sixth electromagnetic valve (4f) is arranged on the tenth pipeline (3j), a seventh electromagnetic valve (4g) is arranged on the seventh pipeline (3g), and a third pressure sensor (5c) is arranged on the fifth pipeline (3 e);
the controller is electrically coupled to the first solenoid valve (4a), the second solenoid valve (4b), the third solenoid valve (4c), the fourth solenoid valve (4d), the fifth solenoid valve (4e), the sixth solenoid valve (4f), the seventh solenoid valve (4g), the first pressure sensor (5a), the second pressure sensor (5b), and the third pressure sensor (5c) at the same time;
the controller is a programmable logic controller with redundant configuration.
2. The system according to claim 1, characterized in that the multi-stage gas dynamic compressor (1) has a stage of 2.
3. A system according to claim 1, characterized in that each of said multi-stage gas-powered compressors (1) comprises: the device comprises a body (11) with a three-way structure, a buffer shell (12) positioned in the body (11), a spray gun (13) and a nozzle (14) connected with the spray gun (13);
the body (11) is provided with a high-pressure air inlet end (111) with gradually-reduced inner diameter, an air outlet end (112) with gradually-increased inner diameter and a low-pressure air inlet end (113) with the same diameter according to the air inlet direction, and the high-pressure air inlet end (111), the air outlet end (112), the buffer shell (12), the spray gun (13) and the nozzle (14) are coaxially arranged;
the opening end of the buffer shell (12) faces the high-pressure air inlet end (111) and is distributed, the closed end of the buffer shell is provided with a first through hole (121) communicated with the air outlet end (112), and the side wall of the buffer shell is provided with a plurality of second through holes (122) communicated with the low-pressure air inlet end (113);
the nozzle (14) penetrates through the high-pressure air inlet end (111) and is fixed in the buffer shell (12);
the inner diameters of the nozzle (14) and the spray gun (13) are gradually reduced according to the air inlet direction;
the minimum inner diameter of the nozzle (14), the aperture of the first through hole (121) and the maximum diameter of the air outlet end (112) are increased in sequence.
4. The system of claim 1, further comprising: and the high-pressure air storage tank (6) is arranged on the tenth pipeline (3j) and is positioned between the air outlet end of the gas reciprocating compressor (2) and the second electromagnetic valve (4 b).
5. The system of claim 4, further comprising: an eighth solenoid valve (4h) disposed on the tenth line (3j) and located between the outlet end of the gas reciprocating compressor (2) and the high pressure gas tank (6);
the eighth solenoid valve (4h) is electrically coupled to the controller.
6. A system according to claim 1, characterized in that a first valve (7a) is arranged on the first line (3 a);
a second valve (7b) is arranged on the second pipeline (3 b).
7. The system according to claim 6, wherein the first valve (7a) and the second valve (7b) are ball valves.
8. The system according to claim 1, wherein the gas reciprocating compressor (2) is a liquefied natural gas reciprocating compressor.
9. A system according to claim 1, wherein the gas reciprocating compressor (2) is an electrically driven reciprocating compressor.
10. A system according to any one of claims 1 to 9, wherein the low pressure inlet end of the first stage aerodynamic compressor (1a) is also in communication with an auxiliary duct in a compressor station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920261345.0U CN209909562U (en) | 2019-02-28 | 2019-02-28 | System for be used for retrieving compressor station unloading natural gas |
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| CN201920261345.0U CN209909562U (en) | 2019-02-28 | 2019-02-28 | System for be used for retrieving compressor station unloading natural gas |
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| CN209909562U true CN209909562U (en) | 2020-01-07 |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211112 Address after: Room 08-10, 6 / F, block a, No. 5, Dongtucheng Road, Chaoyang District, Beijing 100013 Patentee after: National Petroleum and natural gas pipeline network Group Co., Ltd Address before: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee before: PetroChina Co Ltd |