Torch emptying gas condensate recovery system

Abstract

The utility model discloses a torch emptying gas condensate recovery system which comprises a torch header pipe and a condensate buffer tank, the torch header pipe is connected with the condensate buffer tank through a condensate recovery pipe, a condensate inlet valve is arranged on the condensate recovery pipe, an outlet of the condensate buffer tank is connected with a condensate pipe, and the condensate pipe is connected with a condensate outlet valve. The condensate pipe is connected with a blow-off pipe, the blow-off pipe is connected to a floor drain, the blow-off pipe is provided with a blow-off valve, the condensate buffer tank is provided with a nitrogen pipe, the nitrogen pipe is externally connected with a nitrogen pipe network, the nitrogen pipe is provided with a nitrogen cut-off valve, and the nitrogen cut-off valve is connected with the blow-off valve. According to the torch emptying gas condensate recovery system, the torch emptying gas condensate can be conveyed to the downstream for treatment without arranging a transfer pump, the investment is reduced, meanwhile, the workload of staff is reduced, and the use convenience and safety are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical storage and transportation, in particular to a flare vent gas condensate recovery system. Background Art

[0002] The flare venting gas from a petrochemical production unit flows over long distances in the pipeline, and its physical parameters such as temperature and pressure change compared to when it is urgently vented from the unit. The relatively heavy components in the flare venting gas condense to produce condensate. The main components of the condensate are propane, butane and hydrocarbons above pentane. According to industry standards, the condensate needs to be recovered in a closed manner.

[0003] At present, most domestic refineries use condensate transfer pumps to deliver condensate from buffer tanks to light-polluted oil tanks or devices. As the scale of refineries increases and the number of devices increases, the laying distance of the flare vent air pipeline from the device to the flare facility becomes longer and longer, and the installation low points of the flare vent air pipeline increase accordingly, resulting in a large number of condensate buffer tanks and a more dispersed distribution. Not only does it require a large number of transfer pumps, but the transfer pump is a dynamic equipment and needs to consider the fire protection distance from the surrounding area. In addition, the intermittent operation of the transfer pump also increases the workload of the operator. Summary of the invention

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a flare vent gas condensate recovery system, which can transport the flare vent gas condensate to downstream treatment without arranging a transfer pump, thereby reducing investment and employee workload, and can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a flare venting gas condensate recovery system, comprising a flare main pipe and a condensate buffer tank, the flare main pipe and the condensate buffer tank are connected by a condensate recovery pipe, the condensate recovery pipe is provided with a condensate inlet valve, the outlet of the condensate buffer tank is connected with a condensate pipe, the condensate pipe is connected to a drain pipe, the drain pipe is connected to a floor drain, the drain pipe is provided with a drain valve, the condensate buffer tank is provided with a nitrogen pipe, the nitrogen pipe is externally connected to a nitrogen pipe network, and the nitrogen pipe is provided with a nitrogen shut-off valve.

[0006] As a preferred technical solution of the present utility model, the pressure of the nitrogen introduced into the nitrogen pipe is 0.7 MPa.

[0007] As a preferred technical solution of the utility model, a light hydrocarbon gas vent pipe is connected between the condensate buffer tank and the flare main pipe, and a light hydrocarbon gas vent shut-off valve is provided on the light hydrocarbon gas vent pipe.

[0008] As a preferred technical solution of the utility model, the condensate buffer tank is connected to a light hydrocarbon gas release pipe, and the light hydrocarbon gas release pipe is provided with a light hydrocarbon gas release valve.

[0009] As a preferred technical solution of the utility model, the condensate buffer tank is provided with an on-site pressure gauge, and the condensate buffer tank is provided with an on-site liquid level meter.

[0010] As a preferred technical solution of the utility model, the condensate buffer tank is externally connected with a remote pressure gauge and a remote liquid level gauge.

[0011] As a preferred technical solution of the utility model, a condensate cut-off valve is provided on the condensate pipe.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: the flare vent gas condensate recovery system is reasonably designed and easy to operate. By connecting 0.7MPa nitrogen to the condensate buffer tank, the condensate recovered from the flare vent gas is sent to the drain pipe under the action of nitrogen pressure due to the low pressure of the flare vent gas, thereby achieving the goal of transporting the flare vent gas condensate to downstream treatment without setting up a condensate transfer pump, which can not only reduce investment and increase safety, but also reduce the workload of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the utility model system.

[0014] In the figure: 1 flare main pipe, 2 condensate recovery pipe, 3 condensate inlet valve, 4 light hydrocarbon gas vent pipe, 5 light hydrocarbon gas vent cut-off valve, 6 nitrogen pipe, 7 nitrogen cut-off valve, 8 light hydrocarbon gas release pipe, 9 light hydrocarbon gas release valve, 10 local pressure gauge, 11 local liquid level gauge, 12 condensate pipe, 13 condensate cut-off valve, 14 drain pipe, 15 drain valve, 16 floor drain, 17 condensate buffer tank, 18 remote pressure gauge, 19 remote liquid level gauge. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] See also Figure 1The utility model provides a technical solution: a flare venting gas condensate recovery system, comprising a flare main pipe 1 and a condensate buffer tank 17, the flare main pipe 1 and the condensate buffer tank 17 are connected through a condensate recovery pipe 2, the condensate recovery pipe 2 is provided with a condensate inlet valve 3, the outlet of the condensate buffer tank 17 is connected with a condensate pipe 12, the condensate pipe 12 is connected with a drain pipe 14, the drain pipe 14 is connected to a floor drain 16, the drain pipe 14 is provided with a drain valve 15, the condensate buffer tank 17 is provided with a nitrogen pipe 6, the nitrogen pipe 6 is externally connected to a nitrogen pipe network, and the nitrogen pipe 6 is provided with a nitrogen cut-off valve 7.

[0017] The flare main pipe 1 is provided with a low-point condensate discharge at the low point of the pipeline installation. The condensate is sent from the condensate discharge point to the condensate buffer tank 17 through the condensate recovery pipe 2 for closed recovery. When the condensate buffer tank 17 is in normal working state, the condensate inlet valve 3 is normally open. 0.7MPa nitrogen is connected to the condensate buffer tank 17 from the nitrogen pipeline network in the plant area to provide nitrogen for the system. When the condensate buffer tank 17 is in normal working state, the nitrogen cut-off valve 7 is normally open;

[0018] When the temperature is high in summer and autumn, the condensate collected in the condensate buffer tank 17 will produce lighter light hydrocarbon gas due to evaporation. This part of the gas returns to the flare main pipe 1 through the light hydrocarbon vent pipe 4. When the condensate buffer tank 17 is in normal working condition, the light hydrocarbon vent valve 5 is always open. The heavier condensate accumulated in the lower part of the condensate buffer tank 17 is sent to the sewage pipe 14 through the condensate pipe 12 under the action of 0.7MPa nitrogen pressure. When the condensate buffer tank 17 is in normal working condition, the condensate cut-off valve 13 is always open;

[0019] When the condensate buffer tank 17 is in normal working condition, the light hydrocarbon gas release valve 9 and the drain valve 15 are normally closed. When the condensate buffer tank 17 is under maintenance, the condensate inlet valve 3, the light hydrocarbon gas venting shut-off valve 5, the nitrogen shut-off valve 7, and the condensate shut-off valve 13 are all closed, and the light hydrocarbon gas release valve 9 is opened to release the small amount of residual gas in the condensate buffer tank 17 into the atmosphere; the drain valve 15 is opened to send the small amount of oil remaining in the condensate buffer tank 17 to the oily sewage pipeline network through the floor drain 16 for further treatment.

[0020] A local pressure gauge 10, a local liquid level gauge 11, a remote pressure gauge 18 and a remote liquid level gauge 19 are arranged on the condensate buffer tank 17. The output ends of the remote pressure gauge 18 and the remote liquid level gauge 19 are electrically connected to the input end of the control system of the central control room. The real-time pressure and liquid level of each condensate buffer tank 17 can be observed on site, and the pressure and liquid level of each condensate buffer tank 17 can also be seen in the central control room, thereby reducing the workload of operators to check multiple condensate buffer tanks 17 on site. When the condensate buffer tank 17 reaches a high liquid level, an alarm is sounded, or when the nitrogen pressure delivery flare venting gas condensate system fails, the operator can be reminded to arrive at the site in time to deal with the emergency, thereby increasing safety.

[0021] When the utility model recovers the condensate of the flare vent gas, the condensate recovered from the flare vent gas is hydraulically sent down to the drain pipe 14 by nitrogen, so that the flare vent gas condensate can be transported to the downstream for treatment without setting a condensate transfer pump, which can not only reduce investment and increase safety, but also reduce the workload of operators, and greatly improve the convenience of use.

[0022] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flare venting gas condensate recovery system, comprising a flare main pipe (1) and a condensate buffer tank (17), wherein the flare main pipe (1) and the condensate buffer tank (17) are connected via a condensate recovery pipe (2), the condensate recovery pipe (2) is provided with a condensate inlet valve (3), the outlet of the condensate buffer tank (17) is connected to a condensate pipe (12), the condensate pipe (12) is connected to a drain pipe (14), the drain pipe (14) is connected to a floor drain (16), and the drain pipe (14) is provided with a drain valve (15), characterized in that: The condensate buffer tank (17) is provided with a nitrogen pipe (6), the nitrogen pipe (6) is externally connected to a nitrogen pipe network, and the nitrogen pipe (6) is provided with a nitrogen shut-off valve (7).

2. A flare vent gas condensate recovery system according to claim 1, characterized in that: The pressure of the nitrogen introduced into the nitrogen pipe (6) is 0.7 MPa.

3. A flare vent gas condensate recovery system according to claim 1, characterized in that: A light hydrocarbon gas vent pipe (4) is connected between the condensate buffer tank (17) and the flare main pipe (1), and a light hydrocarbon gas vent shut-off valve (5) is provided on the light hydrocarbon gas vent pipe (4).

4. A flare vent gas condensate recovery system according to claim 1, characterized in that: The condensate buffer tank (17) is connected to a light hydrocarbon gas release pipe (8), and the light hydrocarbon gas release pipe (8) is provided with a light hydrocarbon gas release valve (9).

5. A flare vent gas condensate recovery system according to claim 1, characterized in that: The condensate buffer tank (17) is provided with an on-site pressure gauge (10), and the condensate buffer tank (17) is provided with an on-site liquid level meter (11).

6. A flare vent gas condensate recovery system according to claim 1, characterized in that: The condensate buffer tank (17) is externally connected to a remote pressure gauge (18) and a remote liquid level gauge (19).

7. A flare vent gas condensate recovery system according to claim 1, characterized in that: The condensate pipe (12) is provided with a condensate cut-off valve (13).

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