CN219014017U

CN219014017U - Natural gas recycling equipment for combustion-driven compressor

Info

Publication number: CN219014017U
Application number: CN202320127857.4U
Authority: CN
Inventors: 齐宝珍; 谭小芳; 毛川文; 马春明; 黎洪珍; 张祥莉; 钟钧; 秦朝霞; 林家鹤; 袁昌勇
Original assignee: Chongqing Huashuo Energy Technology Co ltd
Current assignee: Chongqing Huashuo Energy Technology Co ltd
Priority date: 2023-01-17
Filing date: 2023-01-17
Publication date: 2023-05-12
Anticipated expiration: 2033-01-17

Abstract

The utility model relates to the technical field of long-distance high-pressure natural gas pipeline overhaul, and discloses natural gas equipment recovered by a fuel-driven compressor, which comprises an upstream recovery unit and a downstream recovery unit, wherein the upstream recovery unit and the downstream recovery unit both comprise the fuel-driven compressor and a sled vehicle, and the fuel-driven compressor is sled-mounted on the sled vehicle; the combustion drive compressor is connected with an air inlet pipe, a branch pipe and an air outlet pipe, and a pressure regulator is arranged on the branch pipe, so that the problems of economic loss and environmental damage caused by emptying of natural gas in a overhauling pipe section in the conventional long-distance pipeline overhauling in China are solved.

Description

Natural gas recycling equipment for combustion-driven compressor

Technical Field

The utility model relates to the technical field of long-distance high-pressure natural gas pipeline overhaul, in particular to natural gas recovery equipment of a combustion driving compressor.

Background

After the two large-scale broken pipe explosion combustion accidents happen to the middle and Burm pipeline in Qinglong, the domestic pipeline industry starts to overhaul and reform the middle and Burm pipeline, the middle and precious pipeline, the Chuangjia east pipeline and the like.

The overhaul of the long-distance high-pressure natural gas pipeline is different from the recovery process of the well head gas of the oil-gas field, the pressure in the long-distance pipeline is higher, and the pipeline connection valve chamber of most of the long-distance natural gas pipeline is in remote mountain areas, so that the problems that the working environment is limited by the field, the mountain area road bearing is not suitable for large-scale heavy vehicles to enter and the like exist, therefore, the cold emptying and the hot emptying processes are adopted for the pipe gas in a large number of overhaul pipeline sections, and the natural gas up to tens of millions of standard parties is directly discharged into the air, so that huge economic loss and resource waste are caused, and the natural gas discharged into the air also damages the environment and aggravates the greenhouse effect.

Disclosure of Invention

The utility model aims to provide natural gas recycling equipment for a combustion drive compressor, which solves the problems of economic loss and environmental damage caused by emptying natural gas in an overhaul pipe section in the existing long-distance pipeline overhaul in China.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the natural gas recycling device of the combustion driving compressor comprises an upstream recycling unit and a downstream recycling unit, wherein the upstream recycling unit and the downstream recycling unit both comprise the combustion driving compressor and a sled vehicle, and the combustion driving compressor is sled-mounted on the sled vehicle; the combustion drive compressor is connected with an air inlet pipe, a branch pipe and an air outlet pipe, and the branch pipe is provided with a pressure regulator.

The beneficial effect of this scheme is: the fuel-driven compressor is arranged on the sled in a sled way, a branch pipe on the fuel-driven compressor is directly communicated with an overhaul section of the long-distance high-pressure pipeline, and natural gas stored in the pipeline to be recovered is directly supplied to the fuel-driven compressor to work after being depressurized by the pressure regulator, so that the power problem of field operation of equipment is solved; the combustion drive compressor can also increase the pressure of the natural gas, so that the natural gas needing to be emptied in the overhaul section can be smoothly recovered into the long-distance high-pressure pipeline through the upstream recovery unit and the downstream recovery unit, the recovery of the natural gas is realized, and the problems of economic loss and environmental damage caused by the fact that the natural gas in the overhaul pipe section is emptied when the existing long-distance pipeline is overhauled in China are solved; meanwhile, the gas to be recovered is partially consumed by the gas driving compressor, so that the time required by the device for recovering the natural gas can be shortened, and the influence of overhaul on resident gas is reduced; the upstream recovery unit and the downstream recovery unit are arranged, so that the recovery efficiency of the natural gas stored in the pipeline can be improved, and the problem that the gas is difficult to recover due to overlarge pressure in the long-distance high-pressure pipeline can be further solved by respectively injecting half of the high-pressure natural gas from the two ends of the long-distance high-pressure pipeline.

Preferably, the air inlet pipe, the branch pipe and the air outlet pipe are all high-pressure austenite soft connecting pipelines, the connection part of the high-pressure austenite soft connecting pipelines and the equipment is provided with a hard pipeline for transition, and the hard pipeline is Z-shaped.

The beneficial effect of this scheme is: in practical application, the suction pressure of the natural gas in the pipe to be recovered is 2.0MPa-6.0MPa, the pressure of the natural gas discharged and returned is 5.5MPa-8.6MPa, the high-pressure austenite flexible connecting pipeline can meet the condition of transporting the high-pressure natural gas, and a certain safe fireproof distance is kept between an access port in a reserved valve chamber in the long-distance high-pressure pipeline and an electric drive compressor outside a valve chamber, and the field situation of the field bending trend is overcome; the hard pipeline is Z-shaped, namely, the turning part of a section of pipeline which is vertically upwards is arranged in the hard pipeline, so that the situation that the hard bending and the damage of the pipeline occur to the high-pressure austenite soft connecting pipeline is avoided.

Preferably, a nitrogen cylinder is also included.

The beneficial effect of this scheme is: the nitrogen bottle is arranged, and before the natural gas is recovered from the pipe in the overhaul section, 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.

Preferably, the air inlet pipe is provided with a balancing section, and the balancing section comprises a flowmeter.

The beneficial effect of this scheme is: the balance section comprises a turbine flowmeter and straight pipe parts at the front end and the rear end of the turbine flowmeter, and is arranged, so that natural gas to be recovered flows through a section of straight pipe before entering the combustion drive compressor, the flowing speed of the natural gas is ensured to be more uniform and stable, and the flowmeter can detect the flow of the natural gas in the pipe in real time, and statistics is convenient.

Preferably, an electric explosion-proof cut-off valve is arranged on the air outlet pipe.

The beneficial effect of this scheme is: in the process that the natural gas is continuously extracted and recovered, along with the reduction of the natural gas in the overhaul section, the pressure intensity on the left side of the gas outlet pipe is gradually larger than the pressure intensity on the right side, the pressure difference at two ends of the gas outlet pipe can lead the natural gas to flow back into the electric drive compressor to cause safety accidents, and the electric explosion-proof cut-off valve can automatically seal and block the gas outlet pipe according to the condition of the gas flow inside the gas outlet pipe so as to avoid the condition of the natural gas flowing back to the electric drive compressor, thereby ensuring the safety of the device.

Preferably, the pressure regulator, the nitrogen cylinder, the balancing section and the electric explosion-proof cut-off valve are arranged on the prying vehicle.

The beneficial effect of this scheme is: the pressure device, the nitrogen bottle, the balance section and the electric explosion-proof cut-off valve are arranged on the prying vehicle together with the fuel drive compressor, so that the device is convenient to prepare for field operation at any time.

Preferably, the suction pressure of the combustion-driven compressor is 2.0MPa-6.0MPa, the discharge pressure is 5.5MPa-8.6MPa, the discharge amount is not less than 2.0 thousands ㎥/h, the power is 500KW-1000KW, the weight of the combustion-driven compressor after skid-mounted is less than or equal to 23T, and the length, width and height of the skid-driven compressor are respectively less than 11.0m, 3.0m and 4.0m.

The beneficial effect of this scheme is: because the valve chambers of the long-distance high-pressure pipeline are all located in mountain areas, the wild areas and the like, the combustion drive compressor is specially customized to meet the vehicle-mounted skid-mounted moving requirements of miniaturization, modularization and quick assembly, and meanwhile, the recovered natural gas can be ensured to overcome the high-pressure condition in the long-distance high-pressure pipeline and be recovered smoothly.

Drawings

FIG. 1 is a three-dimensional effect diagram of an embodiment of the present utility model;

FIG. 2 is a schematic diagram of an upstream recovery unit in an embodiment of the utility model.

Detailed Description

The following is a further detailed description of the embodiments:

reference numerals in the drawings of the specification include: the long-distance high-pressure pipeline 1, the main recycling pipeline 2, the main exhaust pipeline 21, the combustion compressor 3, the air inlet pipe 4, the balancing section 41, the turbine flowmeter 42, the first high-pressure gauge 43, the first thermometer 44, the branch pipe 5, the high-efficiency filter 51, the manual cut-off valve 52, the pressure regulator 53, the second high-pressure gauge 54, the second thermometer 55, the air outlet pipe 6, the electric explosion-proof cut-off valve 61, the one-way air outlet valve 62, the valve 7 and the valve chamber 8.

Examples

The embodiment is basically as shown in fig. 1-2, and the natural gas equipment is composed of an upstream recovery unit and a downstream recovery unit, wherein the upstream recovery unit and the downstream recovery unit are respectively arranged at the upstream and the downstream of a section to be maintained of the long-distance high-pressure pipeline 1, the upstream recovery unit and the downstream recovery unit both comprise a combustion compressor 3 and a sled, and the combustion compressor 3 is arranged on the sled in a sled manner so as to facilitate the transportation of the combustion compressor 3 to the field for operation.

As shown in fig. 1, a plurality of valve chambers 8 are arranged on the long-distance high-pressure pipeline 1 at intervals, the valve chambers 8 are communicated with the ground, a valve 7 is reserved in each valve chamber 8 and can cut off the long-distance high-pressure pipeline 1, and when overhauling, one valve chamber 8 is selected from the upstream and the downstream of an overhauling section as an airflow cut-off point of the long-distance high-pressure pipeline 1; in this embodiment, taking an upstream recovery unit disposed upstream of the maintenance section as an example, as shown in fig. 2, a recovery main pipe 2 is communicated with the left side of the long-distance high-pressure pipeline 1, and the specific communication mode is as follows: the inlet reserved in the valve chamber 8 is used as a connection point, the main recovery pipeline 2 is fixed with the inlet in a flange connection mode, and the main recovery pipeline 2 can be used for allowing the natural gas stored in the pipeline to be recovered to flow back into the long-distance high-pressure pipeline 1 after being compressed and pressurized; the right side of the long-distance high-pressure pipeline 1 is communicated with a main exhaust pipeline 21 in the same way, and the main exhaust pipeline 21 can be used for discharging natural gas stored in the pipeline and then enters the combustion compressor 3.

The gas-driven compressor 3 is connected with a gas inlet pipe 4 and a branch pipe 5, the gas inlet pipe 4 is communicated with a pneumatic cylinder in the gas-driven compressor 3, the branch pipe 5 is communicated with a gas engine in the gas-driven compressor 3, as shown in fig. 2, the gas inlet pipe 4 is communicated with a main exhaust pipe 21, the branch pipe 5 is communicated with the gas inlet pipe 4 through a three-way connecting pipe, and the pipe diameter of the gas inlet pipe 4 is larger than that of the branch pipe 5; part of natural gas to be recovered in the overhaul section of the long-distance high-pressure pipeline 1 enters the gas engine through a branch pipe 5 to be used as power for working of the combustion compressor 3; the pressure regulator 53 and the high-efficiency filter 51 are arranged on the branch pipe 5, the high-efficiency filter 51 is arranged in front of the pressure regulator 53, when natural gas passes through the branch pipe 5, the pressure regulator 53 carries out pressure reduction treatment on the high-pressure natural gas output from the long-distance high-pressure pipeline 1, the natural gas enters the gas engine after pressure reduction, and the pressure reduction treatment is carried out on the natural gas so as to ensure that the gas engine can normally use the natural gas; by using the natural gas to be recovered as a power source on site, the problem of power in field operation is solved, part of the natural gas to be recovered is consumed, the time required by equipment for recovering the natural gas is shortened, the overhaul time can be shortened, and the influence on normal gas used by residents is reduced; a high-efficiency filter 51 is arranged in front of the pressure regulator 53 to filter impurities and water vapor in the natural gas, so that the normal operation of the combustion compressor 3 is further ensured; in addition, the branch pipe 5 is also provided with a manual cut-off valve 52, a first thermometer 44 and a first high-pressure gauge 43, so that the flow rate, the pressure intensity and the like of the natural gas in the branch pipe 5 can be monitored and adjusted at any time, and the safety of the operation of the equipment is ensured; in addition, the device comprises an efficient filter 51, a pressure regulator 53, a manual cut-off valve 52, a first thermometer 44, a first high-pressure gauge 43 and other instruments and meters, and the device and the combustion drive compressor 3 are arranged on the sled vehicle together, so that the device is convenient to prepare for field operation at any time.

The air inlet pipe 4 is provided with a balancing section 41, the balancing section 41 comprises a turbine flowmeter 42 and straight pipe parts at the front end and the rear end of the turbine flowmeter 42, and the balancing section 41 is arranged, so that natural gas to be recovered flows through a section of straight pipe before entering the combustion drive compressor 3, the flowing speed of the natural gas becomes more uniform and stable, and the turbine flowmeter 42 can detect the flow of the natural gas in the pipe in real time, so that statistics is facilitated; in this embodiment, the balancing section 41 further includes a second thermometer 55 and a second high-pressure gauge 54, so as to monitor and adjust the flow rate, pressure, etc. of the natural gas in the air inlet pipe 4 at any time, so as to further ensure the safety of the operation of the device; in the same way, the instruments and meters in the balancing section 41 are arranged on the sled together with the combustion drive compressor 3, so as to facilitate field operation of the equipment.

In addition, before retrieving the pipe of long defeated high pressure pipeline 1 overhauls section and exist natural gas, need utilize nitrogen replacement's mode earlier, with the air evacuation in the device to avoid the gas to mix the back with air and more inflammable and explosive, consequently, this equipment still includes a plurality of nitrogen cylinders, in this embodiment, nitrogen cylinders are equipped with three altogether, every bottle 40L, and three nitrogen cylinders all set up on the sled car, so that after with device and long defeated high pressure pipeline 1 intercommunication, utilize nitrogen gas to discharge the air in each pipeline of device, further guarantee the security of operation.

As shown in fig. 2, the gas-driving compressor 3 is also connected with a gas outlet pipe 6, the other end of the gas outlet pipe 6 is communicated with the main recovery pipe 2, and natural gas to be recovered enters the upstream of the overhaul section of the long-distance high-pressure pipeline 1 through the gas outlet pipe 6 after being pressurized by the gas-driving compressor 3, namely, natural gas needing to be emptied in the overhaul section is pressurized and then is recovered into a fault-free pipeline at the upstream of the overhaul section, so that the recovery of the natural gas is realized; because the natural gas is continuously extracted and recovered in the process, the natural gas in the overhaul section is reduced, the pressure intensity on the left side of the gas outlet pipe 6 is gradually larger than the pressure intensity on the right side, the pressure intensity difference at the two ends of the gas outlet pipe 6 can lead the natural gas to flow back into the combustion drive compressor 3 to cause safety accidents, the gas outlet pipe 6 is further provided with an electric explosion-proof cut-off valve 61 and a one-way gas outlet valve 62, the electric explosion-proof cut-off valve 61 can automatically seal and block the gas outlet pipe 6 according to the internal gas flow condition of the gas outlet pipe 6, the condition that the natural gas flows back to the combustion drive compressor 3 is avoided, the safety of equipment is ensured, and the additionally arranged one-way gas outlet valve 62 can further avoid the backflow of the natural gas.

In the embodiment, the air inlet pipe 4, the branch pipe 5 and the air outlet pipe 6 all adopt high-pressure austenite flexible connecting pipelines, in practical application, the suction pressure of the natural gas stored in the pipe to be recovered is 2.0MPa-6.0MPa, the pressure of the natural gas discharged and returned is 5.5MPa-8.6MPa, the high-pressure austenite flexible connecting pipelines can meet the condition of transporting the high-pressure natural gas, and because the long-distance high-pressure pipeline 1 is reserved, a certain safe fireproof distance is kept between an access port in the valve chamber 8 and the combustion driving compressor 3 outside the valve chamber 8, and the condition of field bending and going to the field is overcome; in addition, there is a section of vertical upward connection path at the junction between the valve chamber 8 and the ground and between the ground and the sled car, in this embodiment, the vertical upward section of pipeline 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 upward movement process, and the specific hard pipeline connection mode is exemplified by the branch pipe 5 and the combustion compressor 3: the whole Z-shaped hard pipeline is arranged, the upper end of the hard pipeline is fixed with the combustion driving compressor 3 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.

In addition, the valve chambers 8 of the long-distance high-pressure pipeline 1 are all positioned in mountain areas, the wild areas and the like, so that the combustion-driven compressor 3 is specially customized to meet the requirements of small-sized, modularized and fast-assembled vehicle-mounted skid-mounted movement, the customized combustion-driven compressor 3 is required to have the suction pressure of 2.0MPa-6.0MPa, the discharge pressure of 5.5MPa-8.6MPa, the discharge amount of not less than 2.0 ten thousand ㎥/h and the power of 500KW-1000KW, and in order to smoothly move in the wild, the whole weight of the skid-mounted vehicle is not more than 23T, and the requirements of the skid-mounted vehicle on length, width and height of less than 11.0m, 3.0m and 4.0m are met.

The specific implementation process is as follows: before the natural gas stored in the pipe of the overhaul section of the long-distance high-pressure pipeline 1 is recovered, the air in the equipment is exhausted by utilizing a nitrogen replacement mode, so that the gas and the air are prevented from being more flammable and explosive after being mixed; and then the long-distance high-pressure pipeline 1 to be overhauled and the normal pipeline without faults are sealed and isolated according to the reserved valve chamber 8, then the upstream recovery unit and the downstream recovery unit are respectively connected with the upstream valve chamber 8 and the downstream valve chamber 8 closest to the section to be overhauled, the combustion compressor 3 is started, one part of the natural gas stored in the pipe to be recovered is supplied with energy through the branch pipe 5, and the other part of the natural gas enters the combustion compressor 3 through the air inlet pipe 4 and is respectively conveyed to the upstream and the downstream of the overhauling section after being pressurized by the pneumatic cylinder, so that the field operation of equipment and the recycling of the natural gas are realized. In addition, the upstream recovery unit and the downstream recovery unit are arranged, so that the recovery efficiency of the natural gas stored in the pipeline can be improved, and the problem that the gas is difficult to recover due to overlarge pressure in the long-distance high-pressure pipeline 1 can be further solved by respectively injecting half of high-pressure natural gas from two sides of the pipeline.

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

1. The natural gas equipment is retrieved to burning drive compressor, its characterized in that: the device comprises an upstream recovery unit and a downstream recovery unit, wherein the upstream recovery unit and the downstream recovery unit both comprise a fuel-driven compressor and a sled, and the fuel-driven compressor is sled-mounted on the sled; the combustion drive compressor is connected with an air inlet pipe, a branch pipe and an air outlet pipe, and the branch pipe is provided with a pressure regulator.

2. The gas turbine compressor recovery natural gas plant of claim 1, wherein: the air inlet pipe, the branch pipe and the air outlet pipe are all high-pressure austenite soft connecting pipelines, the connection part of the high-pressure austenite soft connecting pipelines and the equipment is provided with a hard pipeline for transition, and the hard pipeline is Z-shaped.

3. The gas turbine compressor recovery natural gas plant of claim 2, wherein: the nitrogen cylinder is also included.

4. A gas turbine compressor recovery natural gas plant according to claim 3, characterized in that: the air inlet pipe is provided with a balance section which comprises a flowmeter.

5. The gas turbine compressor recovery plant of claim 4, wherein: an electric explosion-proof cut-off valve is arranged on the air outlet pipe.

6. The gas turbine compressor recovery natural gas plant of claim 5, wherein: the pressure regulator, the nitrogen bottle, the balancing section and the electric explosion-proof cut-off valve are all arranged on the sled.

7. The gas turbine compressor recovery plant according to any one of claims 1 to 6, wherein: the suction pressure of the combustion-driven compressor is 2.0MPa-6.0MPa, the discharge pressure is 5.5MPa-8.6MPa, the discharge amount is not less than 2.0 ten thousand ㎥/h, the power is 500KW-1000KW, the weight of the combustion-driven compressor after skid-mounted is less than or equal to 23T, and the length, the width and the height of the skid-driven compressor are respectively less than 11.0m, 3.0m and 4.0m.