CN205299081U - Recovery system of gas gathering station unloading natural gas - Google Patents

Abstract

The utility model relates to a recovery system for venting natural gas in a gas gathering station, which is characterized in that it includes a separation tank, a natural gas compressor, a liquid tank and a torch for igniting the natural gas; the gas outlet of the separation tank passes through A pipeline is connected to the inlet of the natural gas compressor, the gas outlet of the natural gas compressor is connected to a gathering pipeline through a pipeline, the liquid outlet of the separation tank and the liquid discharge port of the natural gas compressor are respectively connected to the liquid tank through a pipeline, and the The pipeline between the tank and the natural gas compressor is connected to the flare through a pipeline. Set a liquid level sensor, a pressure sensor and an electric ball valve on the pipeline between the separation tank and the natural gas compressor, the electric ball valve is set near the inlet of the natural gas compressor, and the pipeline connecting the flare is set near the entrance of the electric ball valve Another electric ball valve is arranged at the end, and the liquid level sensor, the pressure sensor and the two electric ball valves are electrically connected with an electric control cabinet respectively.

Description

A recovery system for vented natural gas in a gas gathering station

technical field

The utility model relates to a recovery system for venting natural gas in a gas gathering station, which belongs to the technical field of natural gas gathering and transportation.

Background technique

The general natural gas surface gathering and transportation system is divided into three levels, namely the natural gas well site device, gas gathering station and purification plant. In actual production and operation, due to the natural gas containing moisture and other reasons, the gas transmission pipeline from the natural gas well site to the gas gathering station will occasionally have liquid accumulation or hydrate, which will cause pipeline blockage in severe cases, causing the gas transmission pipeline to be blocked and affecting Normal production, so it is necessary to vent the natural gas at the inlet of the gas gathering station.

When venting, the operator switches the valve of the incoming gas pipeline with water blockage in the gas gathering station, and guides it to the torch outside the gas gathering station for ignition. The accumulated liquid or hydrate in the pipeline and natural gas are separated from gas and liquid through the separation tank outside the gas gathering station. The hydrate or accumulated liquid is automatically deposited under the separation tank by gravity, and the natural gas is led from the upper part of the separation tank to the flare to ignite and vent. When the effusion is emptied, the operator switches the valves in the station to resume normal production. The advantage of this method of operation is that it is easy to operate, safe and controllable, and its disadvantage is that the amount of natural gas that is ignited and vented is relatively large, about tens of thousands of cubic meters per day, which wastes energy and pollutes the environment. If drying and dehydration or adding hydrate inhibitors are carried out at the wellhead of the gas well, the cost of a set of equipment is about 100,000 to 200,000, not including the cost of chemicals, labor and vehicle transportation. Moreover, the addition of hydrate inhibitors will increase the cost and difficulty of the purification treatment of natural gas in the later stage.

CN201020164819U discloses a gas gathering station vented natural gas injection recovery device. In this device, the injection technology is mainly used for natural gas recovery. The advantage is that the cost of the solution is low, and no additional power is required. The disadvantage is that the venting pressure is limited, and liquid accumulation or hydrate cannot be eliminated, which fundamentally cannot meet the demand for natural gas venting. Moreover, the recovered natural gas has a high moisture content and cannot be introduced into the gathering pipeline. It also needs to be processed in the gas gathering station, which increases the energy consumption in the gas gathering station.

Contents of the invention

In view of the above problems, the purpose of this utility model is to provide a gas gathering station vented natural gas recovery system and its process that can recover vented natural gas and eliminate liquid accumulation and hydrate.

In order to achieve the above object, the utility model adopts the following technical solutions: a recovery system for venting natural gas in a gas gathering station, which is characterized in that it includes a separation tank, a natural gas compressor, a liquid tank and a The torch; the gas outlet of the separation tank is connected with the inlet of the natural gas compressor through a pipeline, and the gas outlet of the natural gas compressor is connected with a gathering pipeline for delivering natural gas to the purification plant through a pipeline, so The liquid outlet of the separation tank and the liquid outlet of the natural gas compressor are respectively connected to the liquid tank through a pipeline, and the pipeline between the separation tank and the natural gas compressor is connected to the The torch is connected.

A liquid level sensor, a pressure sensor and an electric ball valve are arranged on the pipeline between the separation tank and the natural gas compressor, and the electric ball valve is arranged at a position close to the inlet of the natural gas compressor, connected to The pipeline of the torch is arranged near the inlet end of the electric ball valve and is provided with another electric ball valve, the liquid level sensor, the pressure sensor and the two electric ball valves are respectively electrically connected to an electric control cabinet, A controller is arranged in the electric control cabinet, and the electric control cabinet is electrically connected to a monitoring room arranged inside the gas gathering station.

A gate valve and a one-way valve are arranged on the pipeline between the natural gas compressor and the gathering pipeline, and the one-way valve is arranged at a position close to the gathering pipeline.

The natural gas compressor, the liquid level sensor, the pressure sensor, the two electric ball valves and the electric control cabinet are all explosion-proof products.

The natural gas compressor is a three-stage natural gas compressor.

Because the utility model adopts the above technical scheme, it has the following advantages: 1. The utility model is provided with a separation tank, the gas outlet of the separation tank is connected with the natural gas compressor through a pipeline, and the liquid outlet of the separation tank is connected with the liquid tank through a pipeline , used to collect the effusion or hydrate flowing out from the separation tank, the pipeline between the separation tank and the natural gas compressor is respectively connected with a torch for igniting the natural gas through a pipeline, the utility model can satisfy The demand for venting natural gas, energy saving, good economy and environmental protection. 2. The utility model is provided with a liquid level sensor, a pressure sensor and an electric ball valve on the pipeline between the separation tank and the natural gas compressor, and another electric ball valve is provided on the pipeline connected to the torch, and the liquid level sensor, The pressure sensor and the two electric ball valves are electrically connected to an electric control cabinet respectively, and the electric control cabinet is electrically connected to a monitoring room installed inside the gas gathering station, through which the entire recovery system can be monitored remotely. The utility model has the advantages of simple structure, convenient use, High cost performance. 3. The natural gas compressor, liquid level sensor, pressure sensor, two electric ball valves and electric control cabinet of the utility model are all explosion-proof products, which can ensure the safety of personnel and equipment. The utility model system has a high degree of automation, unattended, safe and reliable . 4. The number of gas compression stages of the natural gas compressor of the utility model is three stages, which can compress the gas in three stages, and the pressure of the third stage can be adjusted according to the external pressure. The compressed gas has a small liquid content and can meet the requirements of external It can be directly transported to the external pipeline of the gas gathering station. 5. The one-way valve of the utility model is arranged close to the gathering and transportation pipeline, which can prevent the gas in the gathering and transportation pipeline from flowing back to the natural gas compressor.

Description of drawings

Fig. 1 is the technological process schematic diagram of the present utility model

detailed description

As shown in Figure 1, the utility model proposes a recovery system for venting natural gas in a gas gathering station, which includes a separation tank 1, a natural gas compressor 2, a liquid tank 3 and a torch 4 for igniting natural gas . The gas outlet of the separation tank 1 is connected with the inlet of the natural gas compressor 2 through a pipeline 5, and the gas outlet of the natural gas compressor 2 is connected with a gathering pipeline 6 for transporting natural gas to the purification plant through a pipeline 5. The liquid outlet of the separation tank 1 is connected to the liquid tank 3 through a pipeline 5 for collecting liquid accumulation or hydrate flowing out of the separation tank 1 . The liquid discharge port of the natural gas compressor 2 is connected with the liquid tank 3 through a pipeline 5 . The pipeline 5 between the separation tank 1 and the natural gas compressor 2 is connected to the flare 4 through another pipeline 5 .

In the above embodiment, a liquid level sensor 7 , a pressure sensor 8 and an electric ball valve 9 are provided on the pipeline 5 between the separation tank 1 and the natural gas compressor 2 . Wherein, the electric ball valve 9 is arranged near the inlet of the natural gas compressor 2 . Another pipeline 5 connected to the flare 4 is arranged near the inlet end of the electric ball valve 9 and is provided with another electric ball valve 10 . The liquid level sensor 7, the pressure sensor 8 and the two electric ball valves 9 and 10 are respectively electrically connected to an electric control cabinet 11, and the electric control cabinet 11 is electrically connected to a monitoring room 12 set inside the gas gathering station, through which remote monitoring can be performed The entire recycling system. Wherein, a controller (not shown in the figure) is arranged in the electric control cabinet 11 . When the pressure sensor 8 detects that the pressure of the gas exceeds 0.4 MPa, under the action of the controller, the electric ball valve 10 is automatically opened, and the excess natural gas is ignited and discharged through the torch 4; when the liquid level sensor 7 detects that there is liquid, The electric ball valve 10 is automatically opened, and the liquid is discharged through the pipeline 5 connected to the flare 4 .

In the above embodiment, a gate valve 13 and a one-way valve 14 are provided on the pipeline 5 between the natural gas compressor 2 and the gathering pipeline 6 . Wherein, the one-way valve 14 is arranged near the gathering pipeline 6 to prevent the gas in the gathering pipeline 6 from flowing back to the natural gas compressor 2 .

In the above embodiment, the natural gas compressor 2, the liquid level sensor 7, the pressure sensor 8, the two electric ball valves 9, 10 and the electric control cabinet 11 are explosion-proof products respectively.

In the above embodiment, the number of gas compression stages of the natural gas compressor 2 is three.

The above-mentioned embodiments are only used to illustrate the utility model, wherein the structure and connection mode of each component can be changed, and any equivalent transformation and improvement carried out on the basis of the technical solution of the utility model should not be excluded. Outside the scope of protection of the present utility model.

Claims (6)

1. the recovery system of a gas gathering station emptying natural gas, it is characterised in that: it includes a knockout drum, a natural gas compressor, a liquid case and a torch for being ignited by natural gas; The gas outlet of described knockout drum is connected with the entrance of described natural gas compressor by a pipeline, the gas outlet of described natural gas compressor connects one for natural gas is delivered to the gathering line of purification plant by a pipeline, the liquid outlet of described knockout drum and the leakage fluid dram of described natural gas compressor are connected with described liquid case respectively through a pipeline, are connected with described torch by a pipeline on the described pipeline between described knockout drum with described natural gas compressor.

2. the recovery system of a kind of gas gathering station as claimed in claim 1 emptying natural gas, it is characterized in that: on the described pipeline between described knockout drum and described natural gas compressor, be provided with a liquid level sensor, one pressure transducer and an electrical ball valve, described electrical ball valve is positioned close to the position of described natural gas compressor entrance, the described pipeline connecting described torch is positioned close to the arrival end of described electrical ball valve and is provided with another electrical ball valve, described liquid level sensor, described in described pressure transducer and two, electrical ball valve electrically connects with an electrical control cubicles respectively, a controller it is provided with in described electrical control cubicles, described electrical control cubicles electrical connection one is arranged on the Control Room within gas gathering station.

3. the recovery system of a kind of gas gathering station as claimed in claim 1 emptying natural gas, it is characterized in that: being provided with a gate valve and a check valve on the described pipeline between described natural gas compressor and described gathering line, described check valve is positioned close to the position of described gathering line.

4. the recovery system of a kind of gas gathering station as claimed in claim 2 emptying natural gas, it is characterized in that: being provided with a gate valve and a check valve on the described pipeline between described natural gas compressor and described gathering line, described check valve is positioned close to the position of described gathering line.

5. the recovery system of a kind of gas gathering station as claimed in claim 4 emptying natural gas, it is characterised in that: described natural gas compressor, described liquid level sensor, described pressure transducer, electrical ball valve and described electrical control cubicles respectively anti-explosion product described in two.

6. the recovery system of a kind of gas gathering station emptying natural gas as described in claim 1 or 2 or 3 or 4 or 5, it is characterised in that: described natural gas compressor is three grades of natural gas compressors.