Flare gas recovery treatment system

Abstract

The utility model provides a flare gas recycling system. The flare gas recycling system comprises a flare gas liquid separation tank, a compressor unit, a flare gas water-sealed tank and a heating furnace, a flare gas inlet and a gas phase outlet are formed in the flare gas liquid separation tank, and the flare gas inlet is used for introducing flare gas; the gas phase outlet is respectively communicated with the compressor unit and the flare gas water-sealed tank; the flare gas is separated into a gas phase part and a liquid phase part by the flare gas liquid separation tank; the heating furnace is communicated with the compressor unit through a fuel gas pipeline, and the heating furnace is used for receiving the compressed gas phase part and taking the compressed gas phase part as fuel; the flare gas water-sealed tank is also communicated with an elevated flare; the flare gas water-sealed tank collects the escaping gas phase part and leads the escaping gas phase part to the elevated flare. The flare gas is recovered and then subjected to gas phase and liquid phase separation, and the compressor unit is additionally arranged to carry out pressure increasing treatment on the flare gas, so that stable air pressure in front of the heating furnace and stable operation of the heating furnace are ensured, and the gas is fully combusted and utilized in the heating furnace.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production equipment, and particularly relates to a flare gas recovery and treatment system. Background Technique

[0002] The burning flare is an always-burning lamp and a characteristic of chemical production. Usually, flare gas mainly comes from process adjustments during normal production operations, emissions during equipment switching, relieving of safety valves and pressure control valves, gas emissions during startup, shutdown and abnormal handling, etc. The compositions of flare gas in different chemical production processes are not the same, and the gases discharged from each device to the flare system affect each other. Moreover, flare gas usually has a large discharge volume and high calorific value. If directly discharged to the atmosphere, on the one hand, the heat cannot be reasonably utilized, resulting in waste of resources; on the other hand, combustion exhaust gas is discharged to the atmosphere. Especially for hydrocarbon flare gas, the total emission is about 1500 m 3 / h, and the combustible gas in its gas composition accounts for about 58%. This not only causes waste of resources but also brings environmental pollution and does not meet the carbon emission requirements.

[0003] Domestic patent 202111186263.2, a flare gas recovery system and method for an offshore platform, collects flare gas through a flare gas recovery pipeline and then separates the gas phase and liquid phase using a flare liquid separation tank. The gas separated from the flare liquid separation tank is pressurized by a jet booster using the pressure regulating valve, quick-opening valve and rupture disc of the safety pressure regulating system, and the liquid separated from the flare liquid separation tank is transported to downstream condensate treatment, while the separated gas enters the flare system for combustion through the pressure regulating valve.

[0004] The existing treatment of flare gas recovery focuses on the condensate treatment of the liquid phase, and directly pressurizes the gas phase and then returns it to the flare system for combustion. However, the calorific value and combustible gas components of flare gas cannot be effectively utilized. Especially for hydrocarbon flare gas, the combustible gas in its gas composition accounts for about 58%. When directly entering the flare gas system for combustion, the recovered gas pressure is unstable and special pressurization equipment is required. Once the pressurization equipment fails, or when the flare gas production is small, it cannot ensure the stable gas pressure before entering the flare system. Moreover, the flare gas system only serves as a gas treatment method, and the combustible components of the gas are not well utilized, still resulting in problems of resource waste and environmental protection. Content of the Utility Model

[0005] The utility model provides a flare gas recovery and treatment system, which can recycle flare gas resourcefully, ensure the stable operation of equipment, and effectively save energy and reduce consumption.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A flare gas recovery and treatment system, the flare gas recovery and treatment system includes a flare gas liquid separation tank, and also includes a compressor unit, a flare gas water seal tank and a heating furnace; a flare gas inlet and a gas phase outlet are provided on the flare gas liquid separation tank, and the flare gas inlet is used to connect to flare gas; the gas phase outlet is respectively communicated with the compressor unit and the flare gas water seal tank; the flare gas liquid separation tank is used to separate the flare gas into a gas phase part and a liquid phase part; the heating furnace is communicated with the compressor unit through a fuel gas pipeline, and the heating furnace is used to receive the compressed gas phase part and use it as fuel; the flare gas water seal tank is also communicated with an elevated flare; the flare gas water seal tank is used to collect the escaped gas phase part and lead it to the elevated flare.

[0008] Optionally, the gas phase outlet is respectively communicated with the compressor unit and the flare gas water seal tank through a gas phase outlet pipeline; a three-way switching valve is provided on the gas phase outlet pipeline, and the three-way switching valve is used to switch the connection path between the flare gas liquid separation tank and the compressor unit, or the connection path between the flare gas liquid separation tank and the flare gas water seal tank.

[0009] Optionally, the gas phase outlet pipeline between the three-way switching valve and the compressor unit is a recovery pipeline, and a temperature sensor, a first pressure transmitter and an oxygen content analyzer are provided on the recovery pipeline.

[0010] Optionally, a first control valve is further provided on the recovery pipeline, and the first control valve is electrically connected to the temperature sensor, the pressure transmitter and the oxygen content analyzer respectively.

[0011] Optionally, a first manual valve and a second manual valve are further provided on the recovery pipeline, the first manual valve is arranged on one side of the inlet end of the first control valve; the second manual valve is arranged on one side of the outlet end of the first control valve.

[0012] Optionally, the flare gas recovery and treatment system further includes a compressed gas circuit, and the compressed gas circuit communicates the recovery pipeline and the fuel gas pipeline;

[0013] A gas flow meter is further provided at one end of the fuel gas pipeline close to the compressor assembly;

[0014] A second control valve is provided on the compressed gas circuit, and the second control valve is electrically connected to the gas flow meter.

[0015] Optionally, a third control valve is further provided at one end of the fuel gas pipeline close to the heating furnace; the third control valve is electrically connected to the gas flow meter.

[0016] Optionally, the compressor unit includes a first purifier, a compressor, and a cooler that are connected in sequence. The compressor is connected to the gas phase outlet, and the cooler is connected to the heating furnace.

[0017] Optionally, the compressor unit further includes a second purifier, which is connected between the cooler and the heating furnace.

[0018] Optionally, a liquid phase outlet is provided on the flare gas knockout drum, and the liquid phase outlet is connected to a liquid recovery system through a liquid phase outlet pipeline.

[0019] The beneficial effects of the present utility model are as follows:

[0020] (1) After the flare gas is recovered by the present utility model, gas-liquid separation is carried out, and according to the actual situation of unstable flare gas production, a compressor unit is added to boost, cool, and purify the flare gas, ensuring stable gas pressure in front of the heating furnace, ensuring the stable operation of the heating furnace, enabling the gas to be fully burned and utilized in the heating furnace, turning waste into treasure, and greatly reducing the emission of hydrocarbon gases, achieving the purpose of energy conservation, consumption reduction, and carbon emission reduction.

[0021] (2) The present utility model adds a compressed gas circuit between the compressor unit and the heating furnace to ensure the gas volume of the outlet of the compressor unit when the intake volume of the compressor unit is small, thereby ensuring stable gas pressure in front of the tubes of the heating furnace, enabling the heating furnace to operate stably, burning the recovered gas fully, improving the energy utilization efficiency, and greatly reducing the gas venting volume.

[0022] (3) Control valves and switching valves are provided on each pipeline of the present utility model, which can switch the flow direction according to the actual operating conditions and adapt to various emergency environments.

[0023] (4) The flare gas of the present utility model is boosted, cooled, and purified to ensure that the impurities and water content of the gas after boosting are greatly reduced, ensuring the combustion efficiency in the heating furnace. Description of the Drawings

[0024] Figure 1 is a schematic diagram of the flare gas recovery and treatment system described in the present utility model;

[0025] Figure 2 is a further refined schematic diagram of the flare gas recovery and treatment system described in the present utility model;

[0026] Figure 3 is a schematic diagram of the flare gas recovery and treatment system described in the present utility model with a compressed gas circuit;

[0027] Figure 4 is a schematic diagram of a compressor unit described in the present utility model;

[0028] Figure 5 It is a further schematic diagram of the compressor unit described in the present utility model.

[0029] Wherein: 1. Torch gas liquid separation tank; 11. Torch gas inlet; 12. Gas phase outlet; 2. Compressor unit; 21. First purifier; 22. Compressor; 23. Cooler; 3. Torch gas water seal tank; 4. Heating furnace; 5. Fuel gas pipeline; 51. Gas flowmeter; 52. Third control valve; 6. Elevated flare; 7. Gas phase outlet pipeline; 71. Three-way switching valve; 72. Recovery pipeline; 721. Temperature sensor; 722. First pressure transmitter; 723. Oxygen content analyzer; 724. First control valve; 725. First manual valve; 726. Second manual valve; 8. Compressed gas circuit; 81. Second control valve. Specific embodiments

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are only a part rather than all of the embodiments of the present utility model. The description of at least one exemplary embodiment below is actually only illustrative and in no way restricts the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be clear that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0033] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary statements, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present utility model: the orientation words "inside, outside" refer to inside and outside the contours of the respective components themselves.

[0034] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned" etc. can be used here to describe the spatial positional relationships of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to cover different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0035] In addition, it should be noted that the use of words such as "first", "second" etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0036] It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other. The following will describe the present utility model in detail with reference to the drawings and in combination with the embodiments.

[0037] See Figure 1 , which shows a schematic diagram of a flare gas recovery and treatment system described in the present application. The flare gas recovery and treatment system at least includes a flare gas liquid separation tank 1, a compressor unit 2, a flare gas water seal tank 3, and a heating furnace 4; a flare gas inlet 11 and a gas phase outlet 12 are provided on the flare gas liquid separation tank 1, and the flare gas inlet 11 is used to connect to flare gas; the gas phase outlet 12 is respectively communicated with the compressor unit 2 and the flare gas water seal tank 3; the flare gas liquid separation tank 1 is used to separate the flare gas into a gas phase part and a liquid phase part; the heating furnace 4 is communicated with the compressor unit 2 through a fuel gas pipeline 5, and the heating furnace 4 receives the gas phase part compressed by the compressor unit 2 and uses it as fuel; the flare gas water seal tank 3 is also communicated with an elevated flare 6; the flare gas water seal tank 3 collects the escaped gas phase part and leads it into the elevated flare 6.

[0038] In this embodiment, in the specific use process of the provided flare gas recovery and treatment system, the flare gas generated in production is introduced into the flare gas liquid separation tank 1 through a pipeline. In the flare gas liquid separation tank 1, the flare gas is separated into a gas phase part and a liquid phase part. Among them, the liquid phase part can be exported and recycled through other devices; the gas phase part leaves the flare gas liquid separation tank 1 through the gas phase outlet 12. Under normal working conditions, the gas phase part completes the gas compression operation through the compressor unit 2, thereby increasing its air pressure. The gas phase part with increased air pressure enters the heating furnace 4 through the fuel gas pipeline 5 and is used as fuel for combustion by the heating furnace 4, thereby recycling the available part in the flare gas; in an abnormal working state, such as when the compressor unit 2 suddenly breaks down or is shut down for maintenance, or the fuel gas pipeline 5 is blocked, the gas phase part cannot enter the heating furnace 4 through the compressor unit 2 for combustion and utilization. At this time, the gas phase part can enter the flare water seal tank 3, accumulate in the flare water seal tank 3, and enter the elevated flare 6 for combustion when reaching a certain pressure value range, avoiding safety risks caused by the failure to discharge the flare gas in time.

[0039] The flare gas recovery and treatment system provided in this embodiment separates the flare gas into gas phase and liquid phase after recovery, and can, according to the actual situation of unstable flare gas production, add a compressor unit to perform pressure boosting, cooling, and purification treatment on the flare gas, ensure the stable air pressure in front of the heating furnace, ensure the stable operation of the heating furnace, enable the gas to be fully combusted and utilized in the heating furnace, turn waste into treasure, and greatly reduce the hydrocarbon gas emissions, achieving the purpose of energy conservation, consumption reduction, and carbon emission reduction; at the same time, it also has a flare gas water seal tank 3 as an emergency safety design, which can also ensure that the flare gas is processed in time in case of emergency, avoiding safety risks.

[0040] Further, the working liquid in the flare gas knockout drum 1 can be selected as condensed oil, liquid hydrocarbon mixture or other working liquids well-known to those skilled in the art and applicable to hydrocarbon gases.

[0041] Further, the fuel gas pipeline 5 in this embodiment can also be connected to the fuel gas pipeline network of the factory to collect and use the recovered hydrocarbon gas as fuel.

[0042] Optionally, referring to Figure 2 , in the present utility model, the gas phase outlet 12 is respectively connected to the compressor unit 2 and the flare gas water seal tank 3 through the gas phase outlet pipeline 7; a three-way switching valve 71 is provided on the gas phase outlet pipeline 7, and the three-way switching valve 71 is used to switch the connection path between the flare gas knockout drum 1 and the compressor unit 2, or the connection path between the flare gas knockout drum 1 and the flare gas water seal tank 3.

[0043] In this embodiment, a three-way switching valve 71 is provided on the gas phase outlet pipeline 7 to switch the connection relationship of the gas phase outlet pipeline 7 under different working scenarios. For example, under normal working conditions, the three-way switching valve 71 connects the flare gas knockout drum 1 and the compressor unit 2, and disconnects the connection between the flare gas knockout drum 1 and the flare gas water seal tank 3. At this time, the gas phase part completes the gas compression operation through the compressor unit 2, thereby increasing its air pressure. The gas phase part after increasing the air pressure enters the heating furnace 4 through the fuel gas pipeline 5 and is used as fuel for combustion by the heating furnace 4, so as to recycle the available part in the flare gas; in an abnormal working state, the gas phase part cannot enter the heating furnace 4 through the compressor unit 2 for combustion and utilization. At this time, the three-way switching valve 71 can be used to disconnect the connection between the flare gas knockout drum 1 and the compressor unit 2, and connect the flare gas knockout drum 1 and the flare gas water seal tank 3. The gas phase part enters the flare water seal tank 3, accumulates in the flare water seal tank 3, and enters the elevated flare 6 for combustion when reaching a certain pressure value range, avoiding safety risks caused by the failure to discharge the flare gas in time.

[0044] The flare gas recovery and treatment system provided in this embodiment can switch the flow direction according to the actual working conditions and adapt to various emergency working scenarios.

[0045] It should be noted that those skilled in the art can specifically select the model, manufacturer and installation method of the three-way switching valve 71 according to the actual production and use requirements, and no specific limitation is made in this embodiment.

[0046] Optionally, referring to Figure 2 , between the three-way switching valve 71 and the compressor unit 2 in the present utility model is a recovery pipeline 72, and a temperature sensor 721, a first pressure transmitter 722 and an oxygen content analyzer 723 are provided on the recovery pipeline 72.

[0047] In this embodiment, a temperature sensor 721, a first pressure transmitter 722, and an oxygen content analyzer 723 are provided on the recovery pipeline 72 between the three-way switching valve 71 and the compressor unit 2. The temperature of the gas phase part in the recovery pipeline 72 is detected by the temperature sensor 721, the air pressure of the gas phase part in the recovery pipeline 72 is detected by the first pressure transmitter 722, and the oxygen content of the gas phase part in the recovery pipeline 72 is detected by the oxygen content analyzer 723, so that the gas phase part entering the compressor unit 2 can be detected in real time. In practical applications, when the air pressure, temperature, and oxygen content of the gas phase part are unstable or the values are abnormal, if the gas phase part of the flare gas is continuously input into the compressor unit 2 at this time, it may cause safety risks such as explosion or leakage. Therefore, by setting the temperature sensor 721, the first pressure transmitter 722, and the oxygen content analyzer 723, the gas phase part of the flare gas is monitored in real time, and the working state of the flare gas recovery and treatment system is adjusted in time to avoid potential safety hazards.

[0048] Optionally, referring to Figure 2 , a first control valve 724 is further provided on the recovery pipeline 72 described in the present utility model, and the first control valve 724 is electrically connected to the temperature sensor 721, the first pressure transmitter 722, and the oxygen content analyzer 723 respectively.

[0049] In this embodiment, the first control valve 724 on the recovery pipeline 72 is electrically connected to the temperature sensor 721, the first pressure transmitter 722, and the oxygen content analyzer 723 respectively. The detection and analysis results of the temperature sensor 721, the first pressure transmitter 722, and the oxygen content analyzer 723 are received through the first control valve 724 to switch the connection or disconnection state of the recovery pipeline 72.

[0050] Furthermore, when any two of the detection and analysis results of the temperature sensor 721, the first pressure transmitter 722, and the oxygen content analyzer 723 are abnormal, the first control valve 724 disconnects the recovery pipeline 72, otherwise the recovery pipeline 72 continues to be connected.

[0051] Exemplarily, when any two of the following conditions occur: the pressure of the gas phase part in the recovery pipeline 72 exceeds 6.5 kPa, the oxygen content exceeds 2%, and the temperature exceeds 40 °C, the first control valve 724 disconnects the recovery pipeline 72, otherwise the recovery pipeline 72 continues to be connected.

[0052] It should be noted that the first control valve 724 described in this embodiment can be any control valve well known to those skilled in the art, and no specific limitation is made in this embodiment.

[0053] Optionally, referring to Figure 2, in the present utility model, a first manual valve 725 and a second manual valve 726 are further provided on the recovery pipeline 72. The first manual valve 725 is arranged on one side of the inlet end of the first control valve 724; the second manual valve 726 is arranged on one side of the outlet end of the first control valve 724.

[0054] In this embodiment, the first manual valve 725 and the second manual valve 726 are arranged on both sides of the first control valve 724, combining manual and automatic control to ensure the safety of the recovery pipeline 72.

[0055] Optionally, referring to Figure 3 , the flare gas recovery and treatment system in the present utility model further includes a compressed gas circuit 8. The compressed gas circuit 8 is connected to the recovery pipeline 72 and the fuel gas pipeline 5; a gas flow meter 51 is further arranged at one end of the fuel gas pipeline 5 close to the compressor assembly 2; a second control valve 81 is arranged on the compressed gas circuit 8, and the second control valve 81 is electrically connected to the gas flow meter 51.

[0056] In this embodiment, since the flare gas has the property of unstable production, during the production process, in order to avoid too little gas volume in the separated gas phase, resulting in the intake and outlet gas volumes of the compressor unit 2 being lower than the minimum value, bringing risks of equipment shutdown or even damage to the compressor unit 2, and the too small outlet gas volume affecting the working efficiency of the heating furnace 4, this embodiment sets up the compressed gas circuit 8. The gas flow meter 51 is used to detect the outlet gas volume of the compressor unit 2. When it is detected that the outlet gas volume of the compressor unit 2 is less than a certain specific value, the second control valve 81 makes the compressed gas circuit 8 in a connected state, so that the gas phase part output by the compressor unit 2 returns to the recovery pipeline 72 through the compressed gas circuit 8, converges with the newly output gas phase part of the flare gas liquid separation tank 1, and re-enters the compressor unit 2. The above operations are cycled until it is detected that the outlet gas volume of the compressor unit 2 reaches a certain specific value, and the second control valve 81 makes the compressed gas circuit 8 in a disconnected state, so that the gas phase part enters the heating furnace 4 for combustion and utilization.

[0057] This embodiment can ensure that the intake and outlet gas volumes of the compressor unit 2 are within a reasonable range, avoiding risks of equipment shutdown or even damage to the compressor unit 2 and avoiding affecting the working efficiency of the heating furnace 4.

[0058] Furthermore, the heating furnace 4 should also be connected to the fuel gas pipeline network in the factory to obtain fuel, so that when the flare gas production is insufficient to support the working needs of the heating furnace 4, it can still maintain its working state and avoid affecting the production process where it is located.

[0059] Optionally, referring to Figure 3, at one end of the fuel gas pipeline 5 close to the heating furnace 4 in the present utility model, a third control valve 52 is further provided; the third control valve 52 is electrically connected to the gas flowmeter 51.

[0060] In this embodiment, a third control valve 52 electrically connected to the gas flowmeter 51 is further provided on the fuel gas pipeline 5. Combining with the foregoing embodiment, the gas flowmeter 51 detects the gas output of the compressor unit 2. When it is detected that the gas output of the compressor unit 2 is less than a certain specific value, the second control valve 81 makes the compressed gas circuit 8 in a communicating state, and the third control valve 52 is also in a closed state accordingly, avoiding the continuous entry of the gas output of the compressor unit 2 into the heating furnace 4, affecting the combustion efficiency of the heating furnace 4, and reducing the gas intake of the compressor unit 2, bringing risks.

[0061] Optionally, referring to Figure 4 , the compressor unit 2 in the present utility model includes a first purifier 21, a compressor 22, and a cooler 23 that are connected in sequence. The compressor 22 is connected to the gas phase outlet 12, and the cooler 23 is connected to the heating furnace 4.

[0062] In this embodiment, the compressor unit 2 may include a first purifier 21, a compressor 22, and a cooler 23 that are connected in sequence. In actual use, the first purifier 21 is connected to the recovery pipeline 72, receives the gas phase part of the flare gas from the recovery pipeline 72, purifies the gas phase part, removes possible liquid or solid impurities therein, and outputs the purified gas phase part to the compressor 22 for pressurization to increase the pressure; the pressurized gas phase part enters the cooler 23 for temperature reduction so that after the temperature of the pressurized gas phase part drops to a specific range, it enters the heating furnace 4 through the fuel gas pipeline 5 for combustion. In this embodiment, the gas phase part of the flare gas is purified, pressurized, and cooled, so that it can be in a state with less impurities, and thus can burn fully in the heating furnace 4.

[0063] Optionally, referring to Figure 5 , the compressor unit 2 in the present utility model further includes a second purifier 24, and the second purifier is connected between the cooler 23 and the heating furnace 4.

[0064] In this embodiment, a second purifier 24 is further provided between the cooler 23 and the heating furnace 4, so as to purify the possible liquid part impurities generated during the pressurization and cooling processes of the gas phase part, and avoid its entry into the heating furnace 4, resulting in unstable working conditions and insufficient combustion of the heating furnace 4.

[0065] Optionally, a liquid phase outlet is provided on the flare gas liquid separation tank 1 in the present utility model, and the liquid phase outlet is communicated with the liquid recovery system through a liquid phase outlet pipeline.

[0066] In this embodiment, a liquid phase outlet is provided on the flare gas knockout drum 1, and the liquid phase part generated during the separation of the gas phase and the liquid phase is led to the liquid recovery system through the liquid phase outlet pipeline for utilization.

[0067] It should be noted that those skilled in the art can specifically select the specific structure and form of the liquid recovery system according to the actual production and use requirements, and no specific limitation is made in this embodiment.

[0068] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0069] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A flare gas recovery and processing system, comprising a flare gas liquid separator, characterized in that: It also includes a compressor unit, a flare gas water seal tank, and a heating furnace; The flare gas separator tank is provided with a flare gas inlet and a gas phase outlet, the flare gas inlet is used to receive the flare gas; the gas phase outlet is respectively connected to the compressor unit and the flare gas water seal tank; the flare gas separator tank is used to separate the flare gas into a gas phase part and a liquid phase part; The heating furnace is connected to the compressor unit through a fuel gas pipeline, and the heating furnace is used to receive the compressed gas phase and use it as fuel; The flare gas water seal tank is also connected to the elevated flare; the flare gas water seal tank is used to collect the escaped gas phase and lead it to the elevated flare.

2. The flare gas recovery and processing system according to claim 1, characterized in that: The gas phase outlet is communicated with the compressor unit and the flare gas water seal tank respectively through a gas phase outlet pipeline; A three-way switching valve is provided on the gas phase outlet pipeline, and the three-way switching valve is used to switch the connection passage between the flare gas liquid separator tank and the compressor unit, or the connection passage between the flare gas liquid separator tank and the flare gas water seal tank.

3. The flare gas recovery and processing system according to claim 2, characterized in that: The gas phase outlet pipeline between the three-way switching valve and the compressor unit is a recovery pipeline, and a temperature sensor, a first pressure transmitter and an oxygen content analyzer are arranged on the recovery pipeline.

4. The flare gas recovery and processing system according to claim 3, characterized in that: The recovery pipeline is also provided with a first control valve, and the first control valve is electrically connected to the temperature sensor, the pressure transmitter and the oxygen content analyzer respectively.

5. The flare gas recovery and processing system according to claim 4, characterized in that: The recovery pipeline is further provided with a first manual valve and a second manual valve. The first manual valve is provided on the inlet side of the first control valve; the second manual valve is provided on the outlet side of the first control valve.

6. The flare gas recovery and processing system according to claim 3, characterized in that: The flare gas recovery and processing system also includes a compressed gas loop, The compressed gas circuit is connected to the recovery pipeline and the fuel gas pipeline; A gas flow meter is also provided on one end of the fuel gas pipeline close to the compressor assembly; The compressed gas circuit is provided with a second control valve, and the second control valve is electrically connected to the gas flow meter.

7. The flare gas recovery and processing system according to claim 6, characterized in that: A third control valve is also provided on one end of the fuel gas pipeline close to the heating furnace; The third control valve is electrically connected to the gas flow meter.

8. The flare gas recovery and processing system according to any one of claims 1 to 7, characterized in that: The compressor unit includes a first purifier, a compressor, and a cooler which are connected in sequence. The compressor is connected to the gas phase outlet, and the cooler is connected to the heating furnace.

9. The flare gas recovery and processing system according to claim 8, characterized in that: The compressor unit further includes a second purifier connected between the cooler and the heating furnace.

10. The flare gas recovery and processing system according to claim 1, characterized in that: The torch gas separation tank is provided with a liquid phase outlet, and the liquid phase outlet is connected to a liquid recovery system through a liquid phase outlet pipeline.

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