Pump-free conveying system for oil and gas recovery condensate

Abstract

The utility model discloses an oil gas recovery condensate pump-free conveying system which comprises a condensate temporary storage tank which is respectively connected with a front-end pipeline and a rear-end pipeline of an oil gas recovery condensing device through two pipelines. A balance valve and a condensate pipeline valve are respectively mounted on two pipelines corresponding to a front-end pipeline and a rear-end pipeline of the oil gas recovery condensing device; a liquid level transmitter is also mounted on the condensate temporary storage tank; the condensate temporary storage tank is further connected with a nitrogen supplementing device and a condensate recycling device through two pipelines respectively, and the two pipelines, corresponding to the nitrogen supplementing device and the condensate recycling device, of the condensate temporary storage tank are provided with a nitrogen supplementing valve and a condensate discharging valve respectively. Condensate is pushed to be conveyed and recycled through the air pressure of medium-pressure nitrogen, re-volatilization of the condensate in the conveying process can be reduced, gas blockage caused by high gas-liquid ratio in a condensate pipeline is avoided, the system does not need a pump, and the frequency of pump overhauling and power consumption input are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil gas recovery technical field, concretely is a kind of oil gas recovery condensate pump-free conveying system. BACKGROUND

[0002] The mainstream process for treating VOCs (volatile organic compounds) in the current industry is the "condensation+adsorption" process. When treating low-boiling-point media such as gasoline and naphtha, the minimum processing temperature of the condensation process is about -70°C, and the recovered condensate is prone to volatilization. The condensate recovered in the industry is generally pumped to the designated area of the customer, but under the action of pipeline heat tracing (condensate tank and condensate pipeline heat tracing to prevent icing) and pumping, the condensate is easily re-vaporized, causing a high gas-liquid ratio in the condensate pipeline, resulting in gas blockage, and the pump cannot deliver the condensate to the designated location. After the condensate is vaporized, the gas-liquid ratio of the medium delivered by the pump increases, and the pump is prone to overheating failure under long-term operation in this working condition, which has defects. SUMMARY

[0003] In view of the deficiencies of the prior art, the utility model provides an oil gas recovery condensate pump-free conveying system to solve the problems of gas blockage and pump failure in the prior art.

[0004] To solve the above technical problems, the utility model provides the following technical scheme:

[0005] An oil gas recovery condensate pump-free conveying system includes a condensate temporary storage tank, which is connected to the front-end pipeline and the rear-end pipeline of an oil gas recovery condensing device through two pipelines, respectively, and has a balance valve and a condensate pipeline valve installed on the two pipelines corresponding to the front-end pipeline and the rear-end pipeline of the oil gas recovery condensing device, respectively, and a liquid level transmitter is also installed on the condensate temporary storage tank.

[0006] The condensate temporary storage tank is also connected to a nitrogen supplementing device and a condensate recovery device through two pipelines, respectively, and has a nitrogen supplementing valve and a condensate discharge valve installed on the two pipelines corresponding to the nitrogen supplementing device and the condensate recovery device, respectively.

[0007] Preferably, the pipeline between the front-end pipeline of the oil gas recovery condensing device and the condensate temporary storage tank and the pipeline between the nitrogen supplementing device and the condensate temporary storage tank are both connected to the top of the inner cavity of the condensate temporary storage tank.

[0008] Preferably, the pipeline between the rear-end pipeline of the oil gas recovery condensing device and the condensate temporary storage tank and the pipeline between the condensate recovery device and the condensate temporary storage tank are both connected to the bottom of the inner cavity of the condensate temporary storage tank.

[0009] Preferably, the nitrogen supplementing device is a medium-pressure nitrogen supplementing device with a pressure of 0.3-0.6 MPa.

[0010] Preferably, the nitrogen replenishment valve, condensate pipeline valve, balancing valve, and condensate external discharge valve are all electronically controlled valves, and online pressure gauges are also installed on the pipelines between the nitrogen replenishment valve and the condensate external discharge valve and the condensate storage tank.

[0011] Preferably, the system also includes a controller, wherein the online pressure gauge and the level transmitter are both connected to the controller via signal connection, and the controller is also connected to the nitrogen replenishment valve, the condensate pipeline valve, the balancing valve, and the condensate external discharge valve via signal connection, respectively.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] This invention uses medium-pressure nitrogen to drive the condensate transport and recovery, which can reduce the re-evaporation of condensate during the transport process, avoid gas blockage caused by high gas-liquid ratio in the condensate pipeline, and smoothly discharge the condensate into the condensate recovery device at the customer's designated location. This system does not require a pump, reducing the number of pump maintenance and power consumption input, and solves the problems of gas blockage and pump failure that are common in existing oil and gas recovery technologies. Attached Figure Description

[0014] Fig. 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Fig. 2 This is a schematic diagram of the system of this utility model.

[0016] In the diagram: 1. Nitrogen replenishment valve; 2. Condensate pipeline valve; 3. Balancing valve; 4. Condensate external discharge valve; 5. Condensate storage tank; 6. Level transmitter; 7. Online pressure gauge; 8. Nitrogen replenishment device; 9. Oil and gas recovery and condensation device; 10. Condensate recovery device; 11. Controller. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] like Figs. 1-2 As shown, this utility model provides a technical solution: a pumpless conveying system for oil and gas recovery condensate, including a condensate storage tank 5. The condensate storage tank 5 is connected to the front end pipeline and the rear end pipeline of the oil and gas recovery condensation device 9 through two pipelines respectively. A balance valve 3 and a condensate pipeline valve 2 are respectively installed on the two pipelines corresponding to the front end pipeline and the rear end pipeline of the oil and gas recovery condensation device 9. A liquid level transmitter 6 is also installed on the condensate storage tank 5.

[0019] The condensate temporary storage tank 5 is also connected with the nitrogen supplement device 8 and the condensate recovery device 10 through two pipes respectively, the nitrogen supplement device 8 is a medium-pressure nitrogen supplement device with a pressure of 0.3-0.6 MPa, and the condensate temporary storage tank 5 is respectively provided with a nitrogen supplement valve 1 and a condensate discharge valve 4 on the two pipes corresponding to the nitrogen supplement device 8 and the condensate recovery device 10;

[0020] The pipes between the front-end pipeline of the oil gas recovery condensing device 9 and the condensate temporary storage tank 5 and between the nitrogen supplement device 8 and the condensate temporary storage tank 5 are connected with the top of the inner cavity of the condensate temporary storage tank 5, and the pipes between the rear-end pipeline of the oil gas recovery condensing device 9 and the condensate temporary storage tank 5 and between the condensate recovery device 10 and the condensate temporary storage tank 5 are connected with the bottom of the inner cavity of the condensate temporary storage tank 5;

[0021] The nitrogen supplement valve 1, the condensate pipeline valve 2, the balance valve 3 and the condensate discharge valve 4 are all electronic control valves, the pipes between the nitrogen supplement valve 1 and the condensate temporary storage tank 5 and between the condensate discharge valve 4 and the condensate temporary storage tank 5 are respectively provided with an online pressure gauge 7, and the application further comprises a controller 11, the online pressure gauge 7 and the liquid level transmitter 6 are signal connected with the controller 11, and the controller 11 is signal connected with the nitrogen supplement valve 1, the condensate pipeline valve 2, the balance valve 3 and the condensate discharge valve 4 respectively.

[0022] Working principle:

[0023] In the initial state, the controller 11 successively closes the nitrogen supplement valve 1 and the condensate discharge valve 4, opens the condensate pipeline valve 2 and the balance valve 3, and when the oil gas recovery condensing device 9 runs for a period of time, the condensate reaches a high liquid level in the condensate temporary storage tank 5, the liquid level transmitter 6 alarms the controller 11, the controller 11 successively closes the condensate pipeline valve 2 and the balance valve 3, opens the nitrogen supplement valve 1 and the condensate discharge valve 4, and under the action of the medium-pressure nitrogen, the condensate is sent to the condensate recovery device 10 at a specified position of the customer by using the gas pressure, when the condensate in the condensate temporary storage tank 5 is discharged, the controller 11 successively closes the condensate discharge valve 4 and the nitrogen supplement valve 1, opens the balance valve 3, balances the medium-pressure nitrogen in the condensate temporary storage tank 5 to the oil gas recovery condensing device 9 for further treatment (the nitrogen contains part of VOCs and cannot be directly discharged, and is treated again before the process front end), after the gas pressure balance in the condensate temporary storage tank 5 is completed, the opening and closing states of all the valves above return to the initial state, and the next operation cycle is performed.

[0024] It should be noted that in this text, terms such as "including", "containing" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0025] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A pumpless transfer system for oil and gas recovery condensate, comprising a condensate temporary storage tank (5), characterized in that: The condensate temporary storage tank (5) is connected with the front end pipeline and the rear end pipeline of the oil gas recovery condensing device (9) through two pipelines, and a balance valve (3) and a condensate pipeline valve (2) are respectively installed on the two pipelines corresponding to the front end pipeline and the rear end pipeline of the oil gas recovery condensing device (9), and a liquid level transmitter (6) is further installed on the condensate temporary storage tank (5); The condensate temporary storage tank (5) is further connected with the nitrogen supplement device (8) and the condensate recovery device (10) through two pipelines, and a nitrogen supplement valve (1) and a condensate discharge valve (4) are respectively installed on the two pipelines corresponding to the nitrogen supplement device (8) and the condensate recovery device (10) of the condensate temporary storage tank (5).

2. The oil and gas recovery condensate pumpless transfer system of claim 1, wherein: The pipeline between the front end pipeline of the oil gas recovery condensing device (9) and the condensate temporary storage tank (5) and the pipeline between the nitrogen supplement device (8) and the condensate temporary storage tank (5) are both communicated with the top of the inner cavity of the condensate temporary storage tank (5).

3. The oil and gas recovery condensate pumpless transfer system of claim 1, wherein: The pipeline between the rear end pipeline of the oil gas recovery condensing device (9) and the condensate temporary storage tank (5) and the pipeline between the condensate recovery device (10) and the condensate temporary storage tank (5) are both communicated with the bottom of the inner cavity of the condensate temporary storage tank (5).

4. The oil and gas recovery condensate pumpless transfer system of claim 1, wherein: The nitrogen supplement device (8) is a medium-pressure nitrogen supplement device with a pressure of 0.3-0.6 MPa.

5. The oil and gas recovery condensate pumpless transfer system of claim 1, wherein: The nitrogen supplement valve (1), the condensate pipeline valve (2), the balance valve (3) and the condensate discharge valve (4) are all electronic control valves, and an online pressure gauge (7) is further installed on the pipeline between the nitrogen supplement valve (1) and the condensate temporary storage tank (5) and the pipeline between the condensate discharge valve (4) and the condensate temporary storage tank (5), respectively.

6. An oil and gas recovery condensate pumpless transfer system according to claim 5 wherein: A controller (11) is further included, the online pressure gauge (7) and the liquid level transmitter (6) are both signal connected with the controller (11), and the controller (11) is further signal connected with the nitrogen supplement valve (1), the condensate pipeline valve (2), the balance valve (3) and the condensate discharge valve (4), respectively.

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