CN205640233U - Pipeline under pressure's unloading natural gas recovery unit - Google Patents

Abstract

The invention of the utility model provides a recovery device for vented natural gas of a pressure pipeline, which includes a compressor unit located at the shut-off valve downstream of the pipeline to be recovered, and the compressor unit is respectively connected to the upstream pipeline and the downstream pipeline of the shut-off valve through connecting pipes. , the connecting pipe is respectively provided with an inlet ball valve and an exhaust ball valve for controlling the switching state of the connecting pipe. The compressor unit created by the utility model extracts the natural gas from the closed pipe section to be recovered to the normal downstream gas pipeline, which can conveniently recover a large amount of natural gas in the pipeline, greatly reduces energy loss, and reduces the venting of natural gas The equipment has the advantages of low cost, simple process, low investment and high safety.

Description

A venting natural gas recovery device for pressure pipelines

technical field

The invention belongs to the technical field of oil and gas long-distance pipeline storage and transportation engineering, and in particular relates to a vented natural gas recovery device for pressure pipelines.

Background technique

Natural gas has certain losses in the process of transportation and processing, mainly including leakage loss and venting loss. In recent years, with the continuous construction of long-distance natural gas pipelines, the venting volume of natural gas at compressor stations and various process stations along the line has increased year by year. There are still some defects in the storage and transportation technology. The amount of natural gas vented at the station is obviously high, and the vented natural gas is basically treated in the form of burning flares, resulting in a waste of energy.

For the recovery of vented natural gas, at present, there are mainly two recovery methods at home and abroad: recovery of gas cabinets and direct recovery of online compressors. Whether it is recovery of gas cabinets or direct recovery of compressors, there are complex processes, high equipment costs, and investment Larger, need to store and transport the recovered natural gas, and the storage and transport of natural gas will bring a series of safety problems. Therefore, the existing recovery and utilization process of vented natural gas has defects, which need to be further improved and perfected to reduce economic loss and environmental pollution.

Contents of the invention

In view of this, the present invention aims to propose a vented natural gas recovery device for pressure pipelines to solve the problems of high equipment cost, complicated process, large recovery investment and potential safety hazards in the recovery of vented natural gas.

In order to achieve the above object, the technical solution created by the present invention is achieved in this way:

A device for recovering vented natural gas from a pressure pipeline, which includes a compressor unit located at the shut-off valve downstream of the pipeline to be recovered, and the compressor unit is respectively connected to the upstream valve chamber and the downstream valve chamber of the shut-off valve through connecting pipes. An inlet ball valve and an exhaust ball valve for controlling the switch state of the connecting pipe are respectively arranged on the connecting pipe.

Further, the connecting pipe is fixedly connected to the upstream valve chamber and the downstream valve chamber through connecting flanges.

Further, the compressor unit is also provided with a cooler, and the cooler is connected to the engine of the compressor unit in a waterway through a hose.

Further, the cooler is an air cooler or a water cooler.

Further, the compressor unit also includes a lubricating system, and the lubricating system includes a crankcase oil filling port, an oil level controller, an oil level observation window, a high level oil tank, a control ball valve and an oil outlet ball valve.

Further, the engine of the compressor unit uses natural gas as raw material.

Further, the compressor unit is a movable vehicle-mounted compressor.

Compared with the prior art, the vented natural gas recovery device created by the present invention has the following advantages:

(1) For the compressor unit of the present invention, when the natural gas pipeline needs to be vented, the shut-off valves upstream and downstream of the pipeline to be recovered are closed, and then the compressor unit is arranged at the downstream shut-off valve, and the natural gas is recovered from the closed The pipeline is pumped into the downstream normal gas transmission pipeline, which can conveniently recover a large amount of natural gas in the pipeline, greatly reduces energy loss, and reduces the degree of environmental pollution in the natural gas venting section. The equipment has low cost, simple process, and low investment. and high security advantages;

(2) The compressor unit of the present invention can obtain materials locally, utilize partly vented natural gas as a raw material, drive the compressor unit to work through a gas engine, and solve the problem that there is no power source at the valve chamber of the shut-off valve to provide power for the compressor;

(3) The compressor unit described in the present invention works through a vehicle-mounted unit and has strong mobility. The same set of units can be used to provide natural gas recovery work for different valve chambers, which greatly saves costs. The compressor unit can be directly driven into a natural gas station or The cut-off valve chamber greatly reduces energy loss and provides great convenience for the normal operation of natural gas pipelines.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute improper limitations to the present invention. In the attached picture:

Fig. 1 is the schematic diagram of the vented natural gas recovery device described in the invention creation embodiment;

Fig. 2 is a schematic diagram of a vented natural gas recovery device described in an inventive embodiment of the present invention.

Explanation of reference signs:

1-gas pipeline; 10-upstream valve chamber; 11-downstream valve chamber; 12-block valve; 20-compressor unit; 22-inlet ball valve; 23-exhaust ball valve; 24-connecting pipe; 31-connecting flange ; 40 - Cooler.

detailed description

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention Creation and simplification of description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, a feature defined as "first", "second", etc. may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention based on specific situations.

The present invention will be described in detail below with reference to accompanying drawings 1-2 and in conjunction with embodiments.

The utility model provides a device for recovering vented natural gas for pressure pipelines. The device needs to cooperate with the shut-off valve 12 valve chamber at the downstream of the pipeline to be recovered to complete the recovery and utilization of natural gas. Before using the device, it is necessary to The upstream shut-off valve 12 and the downstream shut-off valve 12 of the recovery pipeline are closed, and the device is arranged at the valve chamber of the downstream shut-off valve 12. The recovery device of the present utility model is not limited to the gas recovery of the vented natural gas pipeline.

The vented natural gas recovery device includes a compressor unit 20, which is a vehicle-mounted compressor. The vehicle-mounted compressor is directly driven into the valve chamber of the shut-off valve 12. They are respectively connected to the upstream valve chamber 10 and the downstream valve chamber 11, and the inlet ball valve 22 and the exhaust ball valve 23 are respectively set to control the switching state of the connecting pipe 24. After the recovery operation is completed, the inlet ball valve 22 and the exhaust ball valve are closed. 23. Disconnect and complete the recovery of vented natural gas.

For example, the natural gas pressure in the gas transmission pipeline 1 is 10Mpa, and the natural gas recovery can be stopped after the minimum recovery is 1Mpa, and the remaining natural gas is vented for disposal.

The connecting pipe 24 is a high-pressure hose or other steel pipelines. The connection of the high-pressure hose is flexible and convenient, while the connection of the steel pipeline is firm and durable, which can be selected according to the actual situation on site.

The connecting pipe 24 is fixedly connected to the upstream valve chamber 10 and the downstream valve chamber 11 through the connecting flange 31, and the connecting flange 31 has a better connection effect, and has the advantages of firm connection and less leakage.

The compressor unit 20 will cause the system to heat up during long-term work, which is a potential threat to the recovery of natural gas. In order to ensure the safety of the system, it is necessary to cool the compressor unit 20, especially the engine. Therefore, in the compressor unit A cooler 40 is also arranged on the 20, and the cooler 40 is connected with the compressor unit 20 through a hose, and the cooler 40 is an air cooler or a water cooler.

In the environment of initial start-up and low start-up temperature, the system should be lubricated and preheated in advance. Usually, the compressor will work normally after the temperature of the lubricating oil reaches 30°C. The compressor unit 20 also includes a lubricating system, and the lubricating system Including crankcase oil filling port, oil level controller, oil level sight glass, high oil tank, control ball valve and oil outlet ball valve.

Usually the valve chamber of the cut-off valve 12 is not provided with a power supply, and the compressor unit 20 with its own power supply will increase the operating cost of the equipment and improve the requirements for the mobility of the compressor. In order to solve this problem, the compressor unit 20 in this technical solution A gas engine is used, and the gas engine directly uses the natural gas at the valve chamber as a raw material to provide power for the compressor unit 20, and local materials are used to solve the problem that there is no power supply at the valve chamber of the shut-off valve 12 .

The movable vehicle-mounted compressor greatly improves the flexibility of the recovery equipment. After one valve chamber is recovered, the compressor unit 20 can directly go to the next valve chamber for recovery. Equipment reuse can greatly reduce costs and provide natural gas The normal operation of the gas pipeline 1 provides great convenience.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the Within the protection scope of the present invention.

Claims (7)

1. A vented natural gas recovery device for pressure pipelines, characterized in that: it includes a compressor unit located at the shut-off valve downstream of the pipeline to be recovered, and the compressor unit is respectively connected with the upstream valve chamber and the downstream valve chamber of the shut-off valve through connecting pipes conduction, the connecting pipe is respectively provided with an inlet ball valve and an exhaust ball valve to control the switching state of the connecting pipe. 2 . The device for recovering vented natural gas from pressure pipelines according to claim 1 , wherein the connecting pipe is fixedly connected to the upstream valve chamber and the downstream valve chamber through connecting flanges. 3 . 3 . The device for recovering vented natural gas from pressurized pipelines according to claim 1 , wherein the compressor unit is further provided with a cooler, and the cooler is connected to the engine of the compressor unit through a hose. 4 . 4 . The device for recovering vented natural gas from pressurized pipelines according to claim 3 , wherein the cooler is an air cooler or a water cooler. 5 . 5. The venting natural gas recovery device of a pressure pipeline according to claim 1, characterized in that: the compressor unit also includes a lubricating system, and the lubricating system includes a crankcase oil filling port, an oil level controller, and an oil level observation Window, high tank, control ball valve and outlet ball valve. 6 . The device for recovering vented natural gas from pressurized pipelines according to claim 5 , wherein the engine of the compressor unit uses natural gas as a raw material. 7 . 7. The device for recovering vented natural gas from pressurized pipelines according to claim 1, wherein the compressor unit is a movable vehicle-mounted compressor.