CN219102708U - Recycling device for secondary high-pressure natural gas - Google Patents
Recycling device for secondary high-pressure natural gas Download PDFInfo
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- CN219102708U CN219102708U CN202320129538.7U CN202320129538U CN219102708U CN 219102708 U CN219102708 U CN 219102708U CN 202320129538 U CN202320129538 U CN 202320129538U CN 219102708 U CN219102708 U CN 219102708U
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Abstract
The utility model relates to the technical field of natural gas recovery, and discloses a secondary high-pressure natural gas recovery device which comprises a compressor, a power mechanism and a high-pressure gas storage tank truck, wherein an air inlet pipe and an air outlet pipe are connected to the compressor, a balance section is arranged on the air inlet pipe, the air outlet pipe is communicated with the high-pressure gas storage tank truck, and the power mechanism provides power for the compressor so as to solve the problem of economic loss caused by directly discharging natural gas in a maintenance pipe section into the air when a natural gas supply pipeline of a city branch, a gas company branch, a town gas valve chamber and a pipe well in China is overhauled.
Description
Technical Field
The utility model relates to the technical field of natural gas recovery, in particular to a secondary high-pressure natural gas recovery device.
Background
A natural gas filling station refers to a location that provides fuel in the form of Compressed Natural Gas (CNG) to Natural Gas Vehicles (NGV) and large CNG sub-station vehicles. The gas in the natural gas pipeline is generally subjected to pre-purification treatment to remove sulfur and moisture in the gas, the pressure is compressed from 0.1-1.0Mpa to 25Mpa by a compressor unit, and finally the gas is supplied to the vehicle by a gas selling machine. And because natural gas belongs to flammable and explosive gas, the gas supply pipeline in the natural gas filling station needs to be overhauled and maintained regularly.
When the pipeline for supplying gas to the natural gas filling station is overhauled, natural gas in the pipeline needs to be emptied in order to ensure operation safety, and because the pressure in the transportation pipeline is larger, the natural gas is difficult to recover and is different from the recovery process of the well head gas of the oil-gas field which is mature at present in China, the natural gas does not need to be subjected to complex processes such as desulfurization, impurity removal, hydrogen sulfide removal and the like, so that the cold emptying and the hot emptying processes are adopted when the gas supply pipeline of the natural gas filling station is overhauled at present, the natural gas is completely and directly discharged into the air, not only is economic loss and resource waste caused, but also the environment is destroyed and the greenhouse effect is aggravated when the natural gas is discharged into the air.
Disclosure of Invention
The utility model aims to provide a recovery device of secondary high-pressure natural gas, which solves the problem of economic loss caused by directly discharging natural gas in a overhauling pipe section into air when overhauling natural gas supply pipelines of a provincial branch line, a gas company branch line and a town gas valve chamber/pipe well in the prior art in China.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the secondary high-pressure natural gas recovery device comprises a compressor, a power mechanism and a high-pressure gas storage tank truck, wherein the compressor is connected with a gas inlet pipe and a gas outlet pipe, a balance section is arranged on the gas inlet pipe, the gas outlet pipe is communicated with the high-pressure gas storage tank truck, and the power mechanism provides power for the compressor.
The beneficial effect of this scheme is: the power mechanism supplies power to the compressor, the compressor works to compress the natural gas stored in the pipe in the overhaul section, then the natural gas is transferred and temporarily stored in the high-pressure gas storage tank truck, and the balance section is arranged on the gas inlet pipe, so that the natural gas to be recovered flows through a section of straight pipe before entering the compressor, and the flowing speed of the natural gas can be more uniform and stable before entering the compressor, so that the running safety of the device is ensured; and then the natural gas is transported to a place where the natural gas can be recycled, thereby solving the problem of economic loss caused by directly discharging the natural gas in the overhauling pipe section into the air in overhauling the gas supply pipeline of the existing domestic natural gas station.
Preferably, the balancing section includes a flow meter, a thermometer and a high pressure gauge.
The beneficial effect of this scheme is: the flowmeter can detect the flow of the natural gas in the pipeline in real time, so that statistics is convenient; the high-pressure manometer and the thermometer can be used for operators to monitor and adjust the flow rate, the pressure and the like of the natural gas in the gas inlet pipe at any time, so that the running safety of the device is further ensured.
Preferably, the air outlet pipe is provided with an electric explosion-proof cut-off valve and a one-way valve.
The beneficial effect of this scheme is: along with the continuous in-process that enters into high-pressure gas storage tank car through the outlet duct of natural gas, the pressure differential can appear at the outlet duct both ends can lead to the natural gas to flow back to in the compressor, arouse the incident, set up electronic explosion-proof trip valve and check valve, electronic explosion-proof trip valve can seal the shutoff to the outlet duct automatically according to the internal air current condition of outlet duct, avoids the condition that the natural gas appears flowing back to the compressor, guarantees the safety of device, and the check valve can further avoid the natural gas to flow back.
Preferably, the air outlet pipe and the air inlet pipe are high-pressure austenite soft connecting pipelines, and the joint of the high-pressure austenite soft connecting pipelines and the device is provided with a hard pipeline for transition.
The beneficial effect of this scheme is: the high-pressure austenite flexible connecting pipeline can meet the condition of transporting high-pressure natural gas, and a certain safe fireproof distance is kept between an access port in a reserved valve chamber in the pipeline and the compressor, and the pipeline is bent to the field condition.
Preferably, the nitrogen gas cylinder, the compressor and the power mechanism are arranged in a skid-mounted mode.
The beneficial effect of this scheme is: the nitrogen cylinder is arranged, before the natural gas is recycled from the pipe in the overhaul section, the air in the device is emptied by utilizing the mode of nitrogen replacement, so that the gas and the air are prevented from being more inflammable and explosive after being mixed, and the nitrogen cylinder, the compressor and the power mechanism are arranged in a skid-mounted mode, so that the device can be conveniently moved to different operation sites at any time.
Preferably, the compressor is an electrically driven compressor and the power mechanism comprises a diesel generator.
The beneficial effect of this scheme is: the generator generates electricity to drive the compressor to work, so that the recovery of natural gas is realized after the natural gas stored in the pipeline is compressed.
Preferably, the compressor is an electrically driven compressor, the power mechanism comprises a gas generator, a first gas supply pipe is connected to the gas generator, and a first pressure regulator is arranged on the first gas supply pipe.
The beneficial effect of this scheme is: the generator selects a gas generator, and the gas generator can locally utilize the natural gas stored in the pipe to be recovered to generate power, so that part of the natural gas to be recovered is consumed, the time required by the device for recovering the natural gas is shortened, and the influence of overhaul on resident gas is reduced.
Preferably, the first air supply pipe is also provided with a high efficiency filter.
The beneficial effect of this scheme is: the high-efficiency filter can filter impurities and water vapor in the natural gas stored in the pipe, so that the normal operation of the gas generator is ensured.
Preferably, the compressor is a combustion drive compressor, a second air supply pipe is arranged on the combustion drive compressor, and a second pressure regulator is arranged on the second air supply pipe.
The beneficial effect of this scheme is: the gas-driven compressor is selected without an additional power mechanism, and natural gas in the natural gas filling station is directly used as driving energy of the gas-driven compressor, so that the operation of setting up a hard pipeline transition on the ground vertical section connection of the underground valve is reduced, the installation flow before the device operation is reduced, and the device operation is more convenient.
Drawings
FIG. 1 is a schematic diagram of embodiment 1 of the present utility model;
fig. 2 is a schematic diagram of embodiment 2 of the present utility model.
Detailed Description
The following is a further detailed description of the embodiments:
reference numerals in the drawings of the specification include: the device comprises a pipeline 1, a main pipeline 11, an electric drive compressor 2, an air inlet pipe 3, a balancing section 31, a turbine flowmeter 32, a first high-pressure gauge 33, a first thermometer 34, an air outlet pipe 4, an electric explosion-proof cut-off valve 41, a one-way air outlet valve 42, a high-pressure air storage tank truck 5, a diesel generator 6, a gas generator 7, an air supply pipe 71, a pressure regulator 72, a high-efficiency filter 73, a second high-pressure gauge 74, a second thermometer 75, a manual cut-off valve 76, a first valve 8 and a second valve 81.
Example 1
Embodiment 1 basically as shown in fig. 1, the recovery device of the secondary high-pressure natural gas as shown in fig. 1 comprises a compressor, a power mechanism and a high-pressure gas storage tank truck 5, wherein in the embodiment, the compressor is an electric drive compressor 2, and the power mechanism is a diesel generator 6. The electric drive compressor 2, the diesel generator 6 and the high-pressure gas storage tank truck 5 are arranged on the skid-mounted vehicle in a skid-mounted mode, so that the device can be conveniently transferred to different natural gas filling stations for natural gas recovery; a cable is arranged between the diesel generator 6 and the electric drive compressor 2 for connection, and the diesel generator 6 generates electricity to drive the compressor 2 to work.
The upstream and downstream of the overhaul section of the pipeline 1 are respectively communicated with two main pipelines 11, a first valve 8 is arranged on the right main pipeline 11, a second valve 81 is arranged on the left main pipeline 11, and the specific main pipeline 11 is arranged in the mode shown in fig. 2: because a plurality of valves are reserved on the pipeline 1 at intervals, the valves can cut off the pipeline 1, when overhauling, one valve is selected nearby at the upstream or downstream of an overhauling section and is used as an airflow cut-off point of the pipeline 1 together with a natural gas filling station, the natural gas filling station is used as a connection point of the main pipeline 11, and the main pipeline 11 is fixed with an access port reserved under the ground of the natural gas filling station through a flange; in this embodiment, as shown in fig. 1, at a stage point downstream of the inspection section, when the natural gas in the pipeline 1 is cut off, the first valve 8 is closed, and the second valve 81 is opened, so that the natural gas in the left side of the pipeline 1 does not flow to the right.
As shown in fig. 1, an air inlet pipe 3 and an air outlet pipe 4 are connected to an electric drive compressor 2, the air inlet pipe 3 can be used for conveying natural gas to be recovered in a pipeline 1 to the electric drive compressor 2, a balance section 31 is arranged on the air inlet pipe 3, the balance section 31 comprises a turbine flowmeter 32 and straight pipe parts at the front end and the rear end of the turbine flowmeter 32, and the balance section 31 is arranged, so that the natural gas to be recovered flows through a section of straight pipe before entering the electric drive compressor 2, the flow speed of the natural gas is enabled to be more stable before entering the electric drive compressor 2, and the turbine flowmeter 32 can detect the flow of the natural gas in the air inlet pipe 3 in real time, and statistics is convenient; in this embodiment, the balancing section 31 further includes a first high-pressure gauge 33 and a first thermometer 34, so as to monitor and adjust the flow rate, pressure, etc. of the natural gas in the air inlet pipe 3 at any time, thereby further ensuring the operation safety of the device, and the instruments and meters in the balancing section 31 are all arranged on the sled together with the electrically driven compressor 2, so that the device can start working at any time at an inspection point reached.
The gas outlet pipe 4 is used for conveying the natural gas after the pressurization of the electric drive compressor 2 into the high-pressure gas storage tank car 5, the design pressure of the pipeline 1 with the secondary high pressure is not more than 4.0MPa, the internal pressure of the high-pressure gas storage tank car 5 can reach 25MPa, the electric drive compressor 2 continuously conveys the natural gas to be recovered into the high-pressure gas storage tank car 5 for recovery temporary storage after compressing the natural gas, the internal pressure of the high-pressure gas storage tank car 5 can be larger and larger along with the continuous entering of the natural gas into the high-pressure gas storage tank car 5 through the gas outlet pipe 4, the pressure of the gas inlet end of the gas outlet pipe 4 can be gradually larger than the pressure of the gas outlet end, the pressure difference between the two ends of the gas outlet pipe 4 can lead the natural gas to flow back into the compressor to cause safety accidents, therefore, the electric explosion-proof cut-off valve 41 and the one-way valve 42 are arranged on the gas outlet pipe 4, the situation of the natural gas returning electric explosion-proof cut-off valve 41 can be automatically blocked on the gas outlet pipe 4 according to the internal airflow situation of the gas outlet pipe 4, the situation that the natural gas returns to the electric drive compressor 2 is avoided, the safety of the device is ensured, and the additionally arranged one-way valve 42 can further avoid the backflow of the natural gas.
In addition, before the natural gas stored in the pipe of the overhaul section of the pipeline 1 is recovered, the air in the device is emptied by utilizing a nitrogen replacement mode, so that the gas and the air are prevented from being more inflammable and explosive after being mixed, and therefore, the device also comprises a plurality of nitrogen cylinders, and the air in each pipeline inside the device is conveniently discharged by utilizing the nitrogen after the device is communicated with the pipeline 1; the nitrogen cylinders are all arranged on the sled vehicle where the electric drive compressor 2 is located.
In the embodiment, the main pipeline 11, the air inlet pipe 3 and the air outlet pipe 4 are all high-pressure austenite soft connecting pipelines, when the pipe natural gas to be recovered in the pipeline 1 with the next highest pressure is transported and recovered in practice, the pressure of the pipe natural gas to be recovered is higher, especially the pressurized natural gas transported in the air outlet pipe 4 is selected, so that the high-pressure austenite soft connecting pipelines can meet the condition of transporting the high-pressure natural gas, and the problem that a certain safe fireproof distance is kept between a reserved valve access port in the pipeline 1 and the electric drive compressor 2 on the ground and the field condition of bending trend is overcome is solved; in addition, there is a section of vertical upward path at the junction of the main pipe 11 to the ground and the ground to the sled car, the pipeline transported in this section of vertical upward path all adopts the high-pressure hard pipeline to carry out transition, the vertical hard pipeline can ensure that natural gas is more stable in the in-process of upward motion, specific hard pipeline connection mode takes the connection between the air inlet pipe 3 and the electric drive compressor 2 as an example: the whole Z-shaped hard pipeline is arranged, the upper end of the hard pipeline is fixed with the inlet of the electric drive compressor 2 through flange connection, the distance between the lower end of the fixed hard pipeline and the ground is 10cm, and the high-pressure austenite soft connecting pipeline is fixed with the lower end of the hard pipeline through a flange.
The specific implementation process is as follows:
the two ends of a pipeline 1 of the overhaul section are closed and cut off by closing valves at the upstream and the downstream, the stored natural gas in the pipe in the overhaul section enters the electric drive compressor 2 through the gas inlet pipe 3, meanwhile, the diesel generator 6 is started, the electric drive compressor 2 is powered by the diesel generator 6, the electric drive compressor 2 starts to work, the input natural gas is compressed and pressurized, and the compressed natural gas enters the high-pressure gas storage tank car 5 through the gas outlet pipe 4 for recovery and storage.
Because diesel generator 6 and electric drive compressor 2 sled dress are on the sled car, consequently this device can in time remove the place that needs to overhaul and carry out the operation to because natural gas filling station all builds in the town, traffic is more convenient, so diesel generator 6, electric drive compressor 2 and high-pressure gas tank car 5 all can be according to specific maintenance condition, select domestic current brand and make up. The balance section 31 and the electric explosion-proof valve can ensure the safety of the device when the pipe natural gas in the pipeline 1 is recovered, and the pipe natural gas is temporarily stored in the high-pressure gas storage tank car 5 and then transported to the next use place, so that the problems of economic loss and serious greenhouse effect caused by directly discharging the pipe natural gas in the air when the gas supply pipeline 1 of the natural gas filling station is overhauled at present in China are avoided.
Example 2
The recovery device of the sub-high pressure natural gas shown in fig. 2 is different from the embodiment 1 in that: the power mechanism is the gas generator 7, is connected with the air supply pipe 71 on the gas generator 7, and the air supply pipe 71 passes through the tee bend connector and connects on intake pipe 3, makes pipeline 1 discharge in intake pipe 3 a part natural gas can enter into gas generator 7 after can passing through the air supply pipe 71 reposition of redundant personnel, and gas generator 7 directly utilizes the pipe that waits to retrieve to deposit natural gas and generates electricity, and power supply drives compressor 2 work, solves the electric compressor 2 power supply problem.
The gas supply pipe 71 is provided with a pressure regulator 72 and a high-efficiency filter 73, the high-efficiency filter 73 is arranged in front of the pressure regulator 72, when natural gas passes through the gas supply pipe 71, the pressure regulator 72 carries out pressure reduction treatment on the natural gas output from the pipeline 1, and the natural gas enters the gas generator 7 to supply energy after pressure reduction, so that the gas generator 7 works to generate electricity; the gas generator 7 generates power to provide necessary power for the operation of the electric drive compressor 2, and meanwhile, the gas generator 7 consumes part of the stored natural gas to be recovered, so that the time required by the device for recovering the natural gas can be shortened, the influence of overhaul on resident gas is reduced, and the overhaul loss is further reduced; a high-efficiency filter 73 is arranged in front of the pressure regulator 72 to filter impurities and water vapor in the natural gas, so that the normal operation of the gas generator 7 is ensured; in addition, in order to further ensure the normal operation of the gas generator 7, the gas supply pipe 71 is further provided with a manual cut-off valve 76, a second thermometer 75 and a second high-pressure gauge 74, so as to monitor and adjust the flow rate, pressure and the like of the natural gas in the gas supply pipe 71 at any time, ensure the operation safety of the device, and instruments including a high-efficiency filter 73, a pressure regulator 72, the manual cut-off valve 76, the second thermometer 75, the second high-pressure gauge 74 and the like are arranged on the sled together with the gas generator 7, so that the device is ready for field operation at any time.
Meanwhile, the air supply pipe 71 also adopts a high-pressure austenite flexible connecting pipeline so as to meet the requirement of transporting high-pressure gas; the connection between the gas supply pipe 71 and the gas generator 7 is also provided with a Z-shaped hard pipeline for transition.
In this embodiment, the gas generator 7 is used as a power mechanism, and the natural gas to be recovered is directly used as an energy source, so that the normal operation of the electric drive compressor 2 can be ensured, and part of the natural gas to be recovered can be consumed, thereby shortening the time required for recovering the natural gas by the device, reducing the influence of overhaul on resident gas and further reducing the overhaul loss.
Example 3
The recovery unit for the secondary high pressure natural gas differs from example 1 and example 2 in that: the compressor is a combustion drive compressor, and the air supply pipe 71 is directly communicated with an air gun of the natural gas filling station through flange connection; during operation, the natural gas in the natural gas filling station is firstly depressurized by the pressure regulator 72 and then is input into the gas driving compressor to enable the gas driving compressor to work, meanwhile, the gas inlet pipe 3 inputs the stored natural gas to be recovered into the gas driving compressor to be compressed and pressurized, and the compressed and pressurized natural gas is temporarily stored in the high-pressure gas storage tank car 5 through the gas outlet pipe 4, so that the recovery of the natural gas is realized.
Through selecting the gas drive compressor, can not need additionally set up power unit and drive the compressor connection with the gas and carry out the energy supply to the direct use natural gas in the natural gas filling station is the drive source of gas drive compressor, can be directly with the air gun intercommunication in gas supply pipe and the natural gas filling station, thereby reduce the operation that ground vertical section connection set up the transition of underground valve upper ground, and reduce the installation flow before the device operation, make the operation of device more convenient.
The foregoing is merely exemplary of the present utility model, and specific technical solutions and/or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present utility model, and these should also be regarded as the protection scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the practical applicability of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (9)
1. The utility model provides a recovery unit of next high pressure natural gas which characterized in that: the device comprises a compressor, a power mechanism and a high-pressure gas storage tank truck, wherein the compressor is connected with a gas inlet pipe and a gas outlet pipe, a balancing section is arranged on the gas inlet pipe, the gas outlet pipe is communicated with the high-pressure gas storage tank truck, and the power mechanism provides power for the compressor.
2. The secondary high pressure natural gas recovery unit of claim 1, wherein: the balancing section comprises a flowmeter, a thermometer and a high-pressure manometer.
3. The secondary high pressure natural gas recovery unit of claim 2, wherein: an electric explosion-proof cut-off valve and a one-way valve are arranged on the air outlet pipe.
4. A secondary high pressure natural gas recovery unit as claimed in claim 3, wherein: the air outlet pipe and the air inlet pipe are both high-pressure austenite soft connecting pipelines, and the joint of the high-pressure austenite soft connecting pipelines and the device is provided with a hard pipeline for transition.
5. The secondary high pressure natural gas recovery apparatus of claim 4, wherein: the nitrogen gas cylinder, the compressor and the power mechanism are arranged in a skid-mounted mode.
6. The secondary high pressure natural gas recovery apparatus of any one of claims 1-5, wherein: the compressor is an electric drive compressor, and the power mechanism comprises a diesel generator.
7. The secondary high pressure natural gas recovery apparatus of any one of claims 1-5, wherein: the compressor is an electric drive compressor, the power mechanism comprises a gas generator, a first gas supply pipe is connected to the gas generator, and a first pressure regulator is arranged on the first gas supply pipe.
8. The secondary high pressure natural gas recovery unit of claim 7, wherein: the first air supply pipe is also provided with a high-efficiency filter.
9. The secondary high pressure natural gas recovery apparatus of any one of claims 1-5, wherein: the compressor is a combustion drive compressor, a second air supply pipe is arranged on the combustion drive compressor, and a second pressure regulator is arranged on the second air supply pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320129538.7U CN219102708U (en) | 2023-01-17 | 2023-01-17 | Recycling device for secondary high-pressure natural gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320129538.7U CN219102708U (en) | 2023-01-17 | 2023-01-17 | Recycling device for secondary high-pressure natural gas |
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| Publication Number | Publication Date |
|---|---|
| CN219102708U true CN219102708U (en) | 2023-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320129538.7U Active CN219102708U (en) | 2023-01-17 | 2023-01-17 | Recycling device for secondary high-pressure natural gas |
Country Status (1)
| Country | Link |
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| CN (1) | CN219102708U (en) |
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2023
- 2023-01-17 CN CN202320129538.7U patent/CN219102708U/en active Active
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