Emergency emission tail gas recovery device for VOCs (volatile organic compounds) facility

Abstract

The utility model discloses a VOCs facility emergency emission tail gas recovery device. The problem that when an existing catalytic oxidation furnace is shut down in an interlocking mode, a system directly discharges VOCs gas, and the environment is prone to being polluted is solved. The device comprises a catalytic oxidation furnace, the liquid separation tank is used for gas-liquid phase separation; the catalytic oxidation furnace is connected with the liquid separation tank; the liquid separation tank is connected with the gas holder recovery device through a first pipeline and is used for recovering a gas-phase material in the liquid separation tank and feeding the gas-phase material into a fuel gas pipe network; and the liquid separation tank is connected with the dirty oil tank through a second pipeline and is used for recovering the liquid-phase material in the liquid separation tank. The device has the beneficial effects that the hidden dangers of excessive emission and air pollution possibly caused by automatic switching to air emission under the conditions of original equipment faults, interlocking and the like are eliminated, high-concentration oil gas can be switched to a gas cabinet recovery device, the impact of the high-concentration oil gas on VOCs treatment equipment is avoided, the equipment is prevented from being damaged, and the operation safety of the equipment is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of VOCs treatment in the intermediate tank farm of oil refining, and particularly relates to a device for recovering the emergency exhaust gas of VOCs facilities. Background Technique

[0002] For the VOCs oil and gas recovery facilities in the storage tank farm, in the oil refining tank farm, chemical tank farm and storage and transportation tank farm, except for the first-phase oil refining tank farm, other equipment all adopt the "condensation recovery + CO" process, and the end treatment equipment is a catalytic oxidation furnace. The VOCs gas discharged from the tank farm is cooled and absorbed by the condensation recovery equipment and then enters the catalytic oxidation furnace for catalytic combustion, and finally meets the national standard emission requirements.

[0003] For the safe operation of the catalytic oxidation furnace, a relatively large number of protective interlocks are set in the catalytic oxidation unit. When the oil and gas concentration entering the catalytic oxidation furnace is too high, or the reaction temperature of the catalyst bed layer in the catalytic oxidation furnace is too high, or the differential pressure of the inlet heat exchanger is too low, etc., the catalytic oxidation furnace will interlock and stop. When the catalytic oxidation furnace interlocks and stops, the oil and gas entering the catalytic oxidation furnace will automatically switch to the on-site direct discharge chimney, exceeding the maximum emission concentration and time allowed by national regulations, and may face problems such as non-compliance with enterprise environmental protection emissions, warnings, administrative fines, etc. Content of the Utility Model

[0004] In order to solve the problem that the system directly discharges VOCs gas when the existing catalytic oxidation furnace interlocks and stops in the background technique, which is easy to pollute the environment, the utility model provides a device for recovering the emergency exhaust gas of VOCs facilities.

[0005] The technical solution of the utility model is: a device for recovering the emergency exhaust gas of VOCs facilities, including a catalytic oxidation furnace, and further including:

[0006] A separation tank for gas-liquid separation; the catalytic oxidation furnace is connected to the separation tank;

[0007] A first pipeline is arranged on the separation tank;

[0008] A second pipeline is arranged on the separation tank;

[0009] A gas holder recovery device, the separation tank is connected to the gas holder recovery device through the first pipeline, and is used for recovering the gas-phase material in the separation tank and sending it into the fuel gas pipeline network; a booster fan is arranged on the first pipeline;

[0010] A dirty oil tank, the separation tank is connected to the dirty oil tank through the second pipeline, and is used for recovering the liquid-phase material in the separation tank, and a condensate pump is arranged on the second pipeline.

[0011] As a further improvement of the utility model, it further includes a pressure transmitter, which is arranged on the liquid separation tank, connected to the booster fan and used to control the operation of the booster fan.

[0012] As a further improvement of the utility model, there are multiple first pipelines, and the booster fan is arranged on each first pipeline.

[0013] As a further improvement of the utility model, it further includes an explosion detonation arrestor, which is arranged at the outlet of the booster fan on the first pipeline and / or at the inlet of the liquid separation tank.

[0014] As a further improvement of the utility model, it further includes a check valve, which is arranged in front of the gas holder recovery device on the first pipeline.

[0015] As a further improvement of the utility model, it further includes:

[0016] A third pipeline, through which the catalytic oxidation furnace is connected to the liquid separation tank;

[0017] An emergency control valve, which is arranged on the third pipeline and has a first closed position and a second position where it is controlled by the catalytic oxidation furnace to open in an emergency so that the third pipeline is connected.

[0018] As a further improvement of the utility model, it further includes a detector, which is arranged on the liquid separation tank and used to measure the oxygen content in the liquid separation tank.

[0019] As a further improvement of the utility model, it further includes:

[0020] A nitrogen replenishing mechanism, which is connected to the liquid separation tank and used to replenish nitrogen to the liquid separation tank;

[0021] A first control valve, which is arranged between the nitrogen replenishing mechanism and the liquid separation tank and has a first closed position and a second position where it is controlled by the detector to open so that the nitrogen replenishing mechanism replenishes nitrogen to the liquid separation tank.

[0022] As a further improvement of the utility model, the booster fan is a Roots booster fan.

[0023] The beneficial effects of the utility model are as follows: it eliminates the potential hazard of exceeding the standard emission and polluting the air caused by the automatic switching to the air discharge in case of original equipment failures, interlocks, etc. It can also switch the high-concentration oil and gas to the gas holder recovery device, avoid the impact of high-concentration oil and gas on the VOCs treatment equipment, prevent equipment damage, and ensure the safe operation of the equipment. The utility model also has the advantages of simple structure, convenient assembly, reliable operation and long service life. Description of the Drawings

[0024] Att Figure 1 It is a schematic diagram of the principle of an embodiment of the utility model.

[0025] In the figure, 1 is a catalytic oxidation furnace; 2 is a liquid separation tank; 21 is a pressure transmitter; 22 is a detector; 3 is a first pipeline; 31 is a booster fan; 32 is an explosion suppression and detonation arrestor; 33 is a check valve; 4 is a second pipeline; 41 is a condensate pump; 5 is a gas holder recovery device; 6 is a dirty oil tank; 7 is a third pipeline; 71 is an emergency control valve; 8 is a nitrogen replenishment mechanism; 81 is a first control valve. Detailed implementation manners

[0026] The embodiments of the present utility model will be further described below with reference to the accompanying drawings:

[0027] As Figure 1 shown, a VOCs facility emergency emission tail gas recovery device includes a catalytic oxidation furnace 1, and further includes:

[0028] A liquid separation tank 2 for gas-liquid separation; the catalytic oxidation furnace 1 is connected to the liquid separation tank 2;

[0029] A first pipeline 3 is arranged on the liquid separation tank 2;

[0030] A second pipeline 4 is arranged on the liquid separation tank 2;

[0031] A gas holder recovery device 5, the liquid separation tank 2 is connected to the gas holder recovery device 5 through the first pipeline 3, and is used for recovering the gas-phase material in the liquid separation tank 2 and sending it into the fuel gas pipeline network; a booster fan 31 is arranged on the first pipeline 3;

[0032] A dirty oil tank 6, the liquid separation tank 2 is connected to the dirty oil tank 6 through the second pipeline 4, and is used for recovering the liquid-phase material in the liquid separation tank 2, and a condensate pump 41 is arranged on the second pipeline 4. The beneficial effects of the present utility model are that it eliminates the potential hazard of exceeding the standard emission and polluting the air that may be caused by automatically switching to the air discharge in case of original equipment failures, interlocks, etc., and can also switch the high-concentration oil and gas to the gas holder recovery device, avoiding the impact of high-concentration oil and gas on the VOCs treatment equipment and preventing equipment damage, ensuring the safe operation of the equipment. The present utility model also has the advantages of simple structure, convenient assembly, reliable operation and long service life.

[0033] Specifically, when the condensation recovery facility, catalytic oxidation furnace or other terminal treatment equipment fails, the automatic control logic can switch other VOCs to the emergency emission route, enter the liquid separation tank, and finally be treated by the gas holder recovery device, eliminating the potential hazard of exceeding the standard emission and polluting the air that may be caused by the automatic switching to the air emission in case of original equipment failures, interlocks, etc. When the oil and gas concentration entering the VOCs oil and gas recovery facility is too high (for example, the floating roof of the storage tank is damaged, or the fractionation tower of the device fails to fully fractionate the light components, etc.), at this time, the high-concentration oil and gas entering the catalytic oxidation furnace may cause irreversible damage to the catalyst due to furnace runaway temperature, or the high-concentration oil and gas may cause the activated carbon adsorption to quickly become saturated and inactivated. The utility model can switch the high-concentration oil and gas to the gas holder recovery device, avoid the impact of high-concentration oil and gas on the VOCs treatment equipment, avoid equipment damage, and ensure the safe operation of the equipment.

[0034] The utility model further includes a pressure transmitter 21, which is arranged on the liquid separation tank 2, connected to the booster fan 31 and used to control the operation of the booster fan 31. Specifically, there are multiple first pipelines 3, and the booster fan 31 is arranged on each first pipeline 3. More specifically, the booster fan 31 is a Roots booster fan. A pressure transmitter is arranged on the liquid separation tank. When the pressure transmitter reaches the set pressure, the booster fan automatically runs and sends the oil and gas into the gas holder recovery device; when the pressure transmitter reaches the low limit pressure, the booster fan automatically stops running.

[0035] The utility model further includes an explosion suppression and flame arrester 32, which is arranged at the outlet of the booster fan 31 on the first pipeline 3 and / or at the inlet of the liquid separation tank 2. The utility model further includes a check valve 33, which is arranged in front of the gas holder recovery device 5 on the first pipeline 3. The arrangement of the explosion suppression and flame arrester and the check valve makes the product safer.

[0036] The utility model further includes:

[0037] A third pipeline 7, the catalytic oxidation furnace 1 is connected to the liquid separation tank 2 through the third pipeline;

[0038] An emergency control valve 71, which is arranged on the third pipeline 7 and has a first position of closing and a second position of being controlled by the catalytic oxidation furnace 1 to open in case of emergency so that the third pipeline 7 is connected. Such control is convenient and reliable. When the emergency control valve is opened, the directly discharged tail gas enters the liquid separation tank. After gas-liquid separation, the liquid phase is sent to the light pollution oil tank through the condensate pump; the gas phase is sent to the low-pressure flare gas main pipe after being pressurized by the Roots booster fan to >8KPa. When the oxygen content in the tail gas is greater than 1%, the low-pressure nitrogen regulating valve automatically supplements nitrogen to dilute the oxygen content in the tail gas.

[0039] The utility model further includes a detector 22, which is arranged on the liquid separation tank 2 and used to measure the oxygen content in the liquid separation tank 2. Specifically, the utility model further includes:

[0040] The nitrogen replenishing mechanism 8 is connected to the liquid separation tank 2 and is used to replenish nitrogen to the liquid separation tank 2;

[0041] The first control valve 81 is arranged between the nitrogen replenishing mechanism 8 and the liquid separation tank 2 and has a first closed position and a second position controlled by the detector 22 to be opened so that the nitrogen replenishing mechanism 8 replenishes nitrogen to the liquid separation tank 2. In order to ensure that the oxygen content of the gas entering the gas holder recovery device is qualified (<1%), an on-line oxygen content detection instrument and an automatic nitrogen replenishing control valve are also installed on the liquid separation tank. When the oxygen content exceeds 1%, the booster fan stops running, and the automatic nitrogen replenishing valve opens to replenish nitrogen into the liquid separation tank. When the oxygen content is lower than 1% and the pressure of the liquid separation tank reaches the upper limit value for the fan to start, the booster fan resumes running.

[0042] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, in the description of the present invention, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0044] All technicians should note that although the present invention has been described according to the above specific embodiments, the inventive concept of the present invention is not limited to this invention. Any modification using the inventive concept of the present invention will be included in the scope of the patent protection of the present invention.

Claims

1. A VOCs facility emergency exhaust gas recovery device, comprising a catalytic oxidation furnace (1), characterized in that Also included: The liquid separation tank (2) is used for gas-liquid phase separation; the catalytic oxidation furnace (1) is connected to the liquid separation tank (2); A first pipeline (3) is provided on the liquid separation tank (2); A second pipeline (4) is provided on the liquid separation tank (2); A gas cabinet recovery device (5), wherein the liquid separation tank (2) is connected to the gas cabinet recovery device (5) via a first pipeline (3), and is used to recover gaseous materials in the liquid separation tank (2) and send them into the fuel gas pipeline network; a booster fan (31) is provided on the first pipeline (3); The waste oil tank (6) is connected to the waste oil tank (6) via a second pipeline (4) and is used to recover liquid materials in the waste oil tank (2). A condensate pump (41) is provided on the second pipeline (4).

2. A VOCs facility emergency exhaust gas recovery device according to claim 1, characterized in that It also includes a pressure transmitter (21), which is disposed on the liquid separation tank (2), connected to the booster fan (31) and used to control the operation of the booster fan (31).

3. A VOCs facility emergency exhaust gas recovery device according to claim 1, characterized in that There are a plurality of first pipelines (3), and each first pipeline (3) is provided with the booster fan (31).

4. A VOCs facility emergency exhaust gas recovery device according to claim 1, characterized in that It also includes a detonation and flame arrester (32), which is arranged at the outlet of the booster fan (31) on the first pipeline (3) and / or at the inlet of the liquid separation tank (2).

5. A VOCs facility emergency exhaust gas recovery device according to claim 1, characterized in that It also includes a one-way valve (33) arranged in front of the gas cabinet recovery device (5) on the first pipeline (3).

6. A VOCs facility emergency exhaust gas recovery device according to claim 1, characterized in that Also includes: A third pipeline (7), the catalytic oxidation furnace (1) is connected to the liquid separation tank (2) via the third pipeline (); The emergency control valve (71) is arranged on the third pipeline (7) and has a first position of being closed and a second position of being opened by the catalytic oxidation furnace (1) in an emergency so that the third pipeline (7) is connected.

7. A VOCs facility emergency exhaust gas recovery device according to claim 1, characterized in that It also includes a detector (22) which is arranged on the liquid separation tank (2) and is used to measure the oxygen content in the liquid separation tank (2).

8. A VOCs facility emergency exhaust gas recovery device according to claim 7, characterized in that Also includes A nitrogen replenishing mechanism (8) connected to the liquid separation tank (2) and used for replenishing nitrogen into the liquid separation tank (2); The first control valve (81) is arranged between the nitrogen replenishing mechanism (8) and the liquid separation tank (2), and has a first position of being closed and a second position of being opened under the control of the detector (22) so that the nitrogen replenishing mechanism (8) replenishes nitrogen for the liquid separation tank (2).

9. A VOCs facility emergency exhaust gas recovery device according to claim 1, characterized in that The booster fan (31) is a Roots booster fan.

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