Ocean oil land terminal wharf VOCs treatment system

Abstract

The invention provides an offshore oil land terminal wharf VOCs treatment system which comprises an oil storage ship VOCs recovery interface unit, a VOCs gas conveying arm, a VOCs conveying pipeline, a safety unit, a gas-liquid separation unit, a VOCs conveying unit and a VOCs treatment unit, and the oil storage ship VOCs recovery interface unit is connected with the VOCs gas conveying arm through a flange; the VOCs gas conveying arm is connected with the safety unit through a VOCs conveying pipeline; the safety unit is connected with the gas-liquid separation unit through a VOCs (Volatile Organic Compounds) conveying pipeline; and a gas phase separated by the gas-liquid separation unit is conveyed to the VOCs treatment unit through the VOCs conveying unit. VOCs gas of the oil storage ship passes through the oil storage ship VOCs recovery interface unit and is treated through the VOCs gas conveying arm, the VOCs conveying pipeline, the safety unit, the gas-liquid separation unit, the VOCs conveying unit and the VOCs treatment unit, so that the VOCs of the offshore oil land terminal wharf are systematically and effectively treated, the emission of waste gas pollutants is reduced, and the environmental protection requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of marine petroleum pollutant treatment, and in particular to a VOCs treatment system for a marine petroleum land terminal. Background Art

[0002] Volatile organic compounds (VOCs) are a general term for volatile organic compounds, and are important precursors of secondary pollutants PM 2.5 and ozone (O3) in the atmospheric environment. VOCs are toxic and carcinogenic, which directly affect human health. At the same time, the intermediate products produced in the photochemical reaction can directly affect the oxidizability of the atmosphere, causing harm to the atmospheric environment.

[0003] The oil and gas industry is an important source of VOCs pollution. Research results show that the annual VOCs emissions from oil storage, transportation and sales in my country are about 1.5 million tons, of which crude oil and finished oil terminals and oil tankers emit about 960,000 tons, accounting for 64% of the total annual VOCs emissions from oil storage, transportation and sales. It is a key area of ​​air pollution prevention and control proposed by national regulations. Therefore, it is urgent to reduce the environmental pollution and other hazards caused by VOCs emissions from offshore oil land terminals to meet the requirements of environmental protection and safe production. Summary of the invention

[0004] To solve the above problems, the present invention aims to propose a VOCs treatment system for offshore oil land terminal, so as to achieve systematic and effective treatment of VOCs at offshore oil land terminal, reduce the emission of waste gas pollutants and meet environmental protection requirements.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A VOCs treatment system for an offshore oil land terminal comprises a VOCs recovery interface unit of an oil storage vessel, a VOCs gas transmission arm, a VOCs transmission pipeline, a safety unit, a gas-liquid separation unit, a VOCs transmission unit and a VOCs treatment unit, wherein the VOCs recovery interface unit of the oil storage vessel is connected to the VOCs gas transmission arm via a flange; the VOCs gas transmission arm is connected to the safety unit via a VOCs transmission pipeline; the safety unit is connected to the gas-liquid separation unit via a VOCs transmission pipeline; and the gas phase separated by the gas-liquid separation unit is transmitted to the VOCs treatment unit via the VOCs transmission unit.

[0007] Furthermore, the safety unit includes a first control valve, a first one-way valve, a pressure measuring device, a pressure safety valve and an electric control valve which are connected in sequence through a VOCs delivery pipeline; the inlet of the safety unit is connected to the VOCs gas delivery arm through the VOCs delivery pipeline; and the outlet of the safety unit is connected to the gas-liquid separation unit.

[0008] Furthermore, when in normal processing conditions, the VOCs gas of the oil storage ship enters the VOCs delivery pipeline through the VOCs gas delivery arm, the first control valve and the electric control valve are opened, the VOCs gas enters the gas-liquid separation unit, and the gas separated by the gas-liquid separation unit is sent to the VOCs treatment unit for treatment through the VOCs delivery unit;

[0009] When an accident occurs, the electric control valve is closed. When the pressure in the VOCs delivery pipeline reaches the pressure setting value of the pressure safety valve, the pressure safety valve is opened, and the VOCs gas passes through the pressure safety valve and is discharged to a safe position.

[0010] Furthermore, the VOCs delivery unit includes a flow metering device, a VOCs delivery fan, a second one-way valve, an explosion-proof flame arrester and an oxygen content analyzer which are sequentially connected through a VOCs delivery pipeline.

[0011] Furthermore, a nitrogen purge pipeline is connected to the VOCs delivery pipeline between the pressure measuring device and the pressure safety valve to prevent air from being dumped into the gas-liquid separation unit; a nitrogen filter and a second control valve are also provided on the nitrogen purge pipeline, the nitrogen filter is used to filter impurities in the nitrogen, and the second control valve is used to determine the opening and closing of the second control valve according to the detection result of the oxygen analyzer. When the VOCs delivery pipeline contains oxygen, the second control valve is opened for nitrogen purge.

[0012] Furthermore, a combustion supplementary gas pipeline is also connected to the VOCs delivery pipeline between the second one-way valve and the explosion-proof flame arrester, and a combustion supplementary gas filter and a third control valve are also provided on the combustion supplementary gas pipeline. The combustion supplementary gas filter is used to filter impurities in the combustion supplementary gas, and the third control valve is used to determine the opening and closing of the third control valve according to whether the VOCs processing unit is ignited. The combustion supplementary gas pipeline is used when the VOCs processing unit is ignited, and the combustion supplementary gas is not consumed during normal operation. The combustion supplementary gas is natural gas.

[0013] Furthermore, the VOCs processing unit includes a VOCs burner, which is provided with a VOCs burner air intake pipeline and a VOCs burner air intake pipeline, and the VOCs burner is connected to the VOCs delivery pipeline at the rear end of the oxygen analyzer through the VOCs burner air intake pipeline.

[0014] Furthermore, a combustion-supporting air pipeline is provided on the air intake pipeline of the VOCs burner, and an air filter and an air delivery fan are also provided on the combustion-supporting air pipeline.

[0015] Furthermore, the gas-liquid separation unit comprises a gas-liquid separator, and the gas-liquid separator is provided with a gas-liquid separator gas phase outlet pipeline and a gas-liquid separator liquid phase outlet pipeline.

[0016] Furthermore, the gas-liquid separator is connected to the VOCs delivery pipeline at the rear end of the electric control valve for separating VOCs into gas phase and liquid phase; the liquid phase is connected to the liquid recovery system through the liquid phase outlet pipeline of the gas-liquid separator; the gas phase is transported to the VOCs treatment unit through the gas phase outlet pipeline of the gas-liquid separator via the VOCs delivery unit.

[0017] Beneficial effects: The VOCs gas from the oil storage ship of the present invention passes through the VOCs recovery interface unit of the oil storage ship and is processed through the VOCs gas transmission arm, VOCs transmission pipeline, safety unit, gas-liquid separation unit, VOCs transmission unit and VOCs processing unit, thereby achieving systematic and effective control of VOCs at the marine oil land terminal, reducing the emission of waste gas pollutants, and meeting environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the VOCs treatment system for an offshore oil land terminal according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] Example 1

[0022] See also Figure 1 : A VOCs treatment system for an offshore oil land terminal, comprising an oil storage ship VOCs recovery interface unit 1, a VOCs gas transmission arm 2, a VOCs transmission pipeline 3, a safety unit 4, a gas-liquid separation unit 5, a VOCs transmission unit 6 and a VOCs treatment unit 7, wherein the oil storage ship VOCs recovery interface unit 1 is connected to the VOCs gas transmission arm 2 via a flange; the VOCs gas transmission arm 2 is connected to the safety unit 4 via a VOCs transmission pipeline 3; the safety unit 4 is connected to the gas-liquid separation unit 5 via a VOCs transmission pipeline 3; the gas phase separated by the gas-liquid separation unit 5 is transported to the VOCs treatment unit 7 via the VOCs transmission unit 6.

[0023] The VOCs gas from the oil storage ship in this embodiment passes through the VOCs recovery interface unit of the oil storage ship and is processed through the VOCs gas transmission arm, VOCs transmission pipeline, safety unit, gas-liquid separation unit, VOCs transmission unit and VOCs treatment unit, thereby achieving systematic and effective control of VOCs at the marine oil land terminal, reducing the emission of waste gas pollutants, and meeting environmental protection requirements.

[0024] In a specific example, the safety unit 4 includes a first control valve 41, a first one-way valve 42, a pressure measuring device 43, a pressure safety valve 44 and an electric control valve 45 which are connected in sequence through the VOCs delivery pipeline 3. The inlet of the safety unit 4 is connected to the VOCs gas delivery arm 2 through the VOCs delivery pipeline 3, and the outlet of the safety unit 4 is connected to the gas-liquid separation unit 5.

[0025] In a specific example, when in normal processing conditions, the VOCs gas of the oil storage ship enters the VOCs delivery pipeline 3 through the VOCs gas delivery arm 2, the first control valve 41 and the electric control valve 45 are opened, and the VOCs gas enters the gas-liquid separation unit 5, and the gas separated by the gas-liquid separation unit 5 is processed by the VOCs delivery unit 6 to the VOCs treatment unit 7;

[0026] When in an accident condition, the electric control valve 45 is closed. When the pressure in the VOCs delivery pipeline 3 reaches the pressure setting value of the pressure safety valve 44, the pressure safety valve 44 is opened, and the VOCs gas passes through the pressure safety valve 44 and is discharged to a safe position.

[0027] In this embodiment, when the VOCs treatment process at the offshore oil land terminal is in an accident condition, the electric control valve is closed. When the pressure in the VOCs transmission pipeline reaches the pressure setting value of the pressure safety valve, the pressure safety valve opens, and the VOCs gas passes through the pressure safety valve and is discharged to a safe position. The treatment process meets the safety and reliability requirements.

[0028] In a specific example, the VOCs delivery unit 6 includes a flow metering device 61 , a VOCs delivery fan 62 , a second one-way valve 63 , an explosion-proof flame arrester 64 and an oxygen content analyzer 65 which are sequentially connected through the VOCs delivery pipeline 3 .

[0029] In a specific example, a nitrogen purge pipeline 8 is also connected to the VOCs delivery pipeline 3 between the pressure measuring device 43 and the pressure safety valve 44, which is used to prevent the gas-liquid separation unit 5 from dumping air; the nitrogen purge pipeline 8 is also provided with a nitrogen filter 9 and a second control valve 10, the nitrogen filter 9 is used to filter impurities in the nitrogen, and the second control valve 10 is used to determine the opening and closing of the second control valve 10 according to the detection result of the oxygen analyzer 65. When the VOCs delivery pipeline 3 contains oxygen, the second control valve 10 is opened for nitrogen purge.

[0030] In a specific example, a combustion supplementary gas pipeline 11 is also connected to the VOCs delivery pipeline 3 between the second one-way valve 63 and the explosion-proof flame arrester 64. The combustion supplementary gas pipeline 11 is also provided with a combustion supplementary gas filter 12 and a third control valve 13. The combustion supplementary gas filter 12 is used to filter impurities in the combustion supplementary gas. The third control valve 13 is used to determine the opening and closing of the third control valve 13 according to whether the VOCs processing unit 7 is ignited. The combustion supplementary gas pipeline 11 is used when the VOCs processing unit 7 is ignited. The combustion supplementary gas is not consumed during normal operation, and the combustion supplementary gas is natural gas.

[0031] In this embodiment, when the VOCs treatment unit performs an ignition operation, the third control valve is opened to supplement natural gas through the combustion supplementary gas pipeline. When the ignition operation is not performed, the third control valve is closed under normal circumstances.

[0032] In a specific example, the VOCs processing unit 7 includes a VOCs burner 71, which is provided with a VOCs burner air intake pipeline 72 and a VOCs burner air intake pipeline 73. The VOCs burner 71 is connected to the VOCs transport pipeline 3 at the rear end of the oxygen analyzer 65 through the VOCs burner air intake pipeline 72.

[0033] In a specific example, a combustion-supporting air pipeline 14 is provided on the VOCs burner air intake pipeline 73 , and an air filter 15 and an air delivery fan 16 are also provided on the combustion-supporting air pipeline 14 .

[0034] The air filter of this embodiment can be used to filter impurities in the air. The combustion-supporting air enters the inlet pipeline of the air conveying fan after passing through the air filter. The outlet pipeline of the air conveying fan is connected to the air intake pipeline of the VOCs treatment unit. The combustion-supporting air helps the VOCs gas to be fully mixed and burned in the VOCs treatment unit.

[0035] In a specific example, the gas-liquid separation unit 5 includes a gas-liquid separator 51 , and the gas-liquid separator 51 is provided with a gas-liquid separator gas phase outlet pipeline 52 and a gas-liquid separator liquid phase outlet pipeline 53 .

[0036] In a specific example, the gas-liquid separator 51 is connected to the VOCs delivery pipeline 3 at the rear end of the electric control valve 45 for separating VOCs into gas phase and liquid phase; the liquid phase is connected to the liquid recovery system through the gas-liquid separator liquid phase outlet pipeline 53; the gas phase is transported to the VOCs treatment unit 7 through the gas-liquid separator gas phase outlet pipeline 52 via the VOCs delivery unit 6.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A VOCs treatment system for an offshore oil land terminal, characterized in that: The invention comprises an oil storage vessel VOCs recovery interface unit (1), a VOCs gas transmission arm (2), a VOCs transmission pipeline (3), a safety unit (4), a gas-liquid separation unit (5), a VOCs transmission unit (6) and a VOCs treatment unit (7), wherein the oil storage vessel VOCs recovery interface unit (1) and the VOCs gas transmission arm (2) are connected via a flange; the VOCs gas transmission arm (2) and the safety unit (4) are connected via a VOCs transmission pipeline (3); the safety unit (4) and the gas-liquid separation unit (5) are connected via a VOCs transmission pipeline (3); and the gas phase separated by the gas-liquid separation unit (5) is transported to the VOCs treatment unit (7) via the VOCs transmission unit (6).

2. The VOCs treatment system for offshore oil land terminal according to claim 1 is characterized in that: The safety unit (4) comprises a first control valve (41), a first non-return valve (42), a pressure measuring device (43), a pressure safety valve (44) and an electric control valve (45) which are connected in sequence through a VOCs delivery pipeline (3); an inlet of the safety unit (4) is connected to the VOCs gas delivery arm (2) through the VOCs delivery pipeline (3); and an outlet of the safety unit (4) is connected to the gas-liquid separation unit (5).

3. The VOCs treatment system for offshore oil land terminal according to claim 2 is characterized in that: When in normal processing conditions, the VOCs gas of the oil storage vessel enters the VOCs transmission pipeline (3) through the VOCs gas transmission arm (2), the first control valve (41) and the electric control valve (45) are opened, and the VOCs gas enters the gas-liquid separation unit (5), and the gas separated by the gas-liquid separation unit (5) is processed by the VOCs transmission unit (6) to the VOCs processing unit (7); When an accident occurs, the electric control valve (45) is closed, and when the pressure in the VOCs delivery pipeline (3) reaches the pressure setting value of the pressure safety valve (44), the pressure safety valve (44) is opened, and the VOCs gas passes through the pressure safety valve (44) and is discharged to a safe position.

4. The VOCs treatment system for offshore oil land terminal according to claim 2 is characterized in that: The VOCs delivery unit (6) comprises a flow metering device (61), a VOCs delivery fan (62), a second one-way valve (63), an explosion-proof flame arrester (64), and an oxygen content analyzer (65) which are sequentially connected via a VOCs delivery pipeline (3).

5. The VOCs treatment system for offshore oil land terminal according to claim 4 is characterized in that: A nitrogen purge pipeline (8) is also connected to the VOCs delivery pipeline (3) between the pressure measuring device (43) and the pressure safety valve (44) to prevent the gas-liquid separation unit (5) from dumping air; a nitrogen filter (9) and a second control valve (10) are also provided on the nitrogen purge pipeline (8); the nitrogen filter (9) is used to filter impurities in the nitrogen; the second control valve (10) is used to determine the opening and closing of the second control valve (10) according to the detection result of the oxygen content analyzer (65); when the VOCs delivery pipeline (3) contains oxygen, the second control valve (10) is opened to perform nitrogen purge.

6. The VOCs treatment system for offshore oil land terminal according to claim 4 is characterized in that: A combustion supplementary gas pipeline (11) is also connected to the VOCs delivery pipeline (3) between the second one-way valve (63) and the explosion-proof flame arrester (64). The combustion supplementary gas pipeline (11) is also provided with a combustion supplementary gas filter (12) and a third control valve (13). The combustion supplementary gas filter (12) is used to filter impurities in the combustion supplementary gas. The third control valve (13) is used to determine the opening and closing of the third control valve (13) according to whether the VOCs processing unit (7) is ignited. The combustion supplementary gas pipeline (11) is used when the VOCs processing unit (7) is ignited. The combustion supplementary gas is not consumed during normal operation. The combustion supplementary gas is natural gas.

7. The VOCs treatment system for offshore oil land terminal according to claim 4 is characterized in that: The VOCs processing unit (7) comprises a VOCs burner (71), wherein the VOCs burner (71) is provided with a VOCs burner air intake pipeline (72) and a VOCs burner air intake pipeline (73), and the VOCs burner (71) is connected to a VOCs delivery pipeline (3) at the rear end of an oxygen analyzer (65) via the VOCs burner air intake pipeline (72).

8. The VOCs treatment system for offshore oil land terminal according to claim 7 is characterized in that: The VOCs burner air intake pipeline (73) is provided with a combustion-supporting air pipeline (14), and the combustion-supporting air pipeline (14) is also provided with an air filter (15) and an air delivery fan (16).

9. The VOCs treatment system for offshore oil land terminal according to claim 2 is characterized in that: The gas-liquid separation unit (5) comprises a gas-liquid separator (51), and the gas-liquid separator (51) is provided with a gas-liquid separator gas phase outlet pipeline (52) and a gas-liquid separator liquid phase outlet pipeline (53).

10. The VOCs treatment system for offshore oil land terminal according to claim 9, characterized in that: The gas-liquid separator (51) is connected to the VOCs delivery pipeline (3) at the rear end of the electric control valve (45) for separating VOCs into a gas phase and a liquid phase; the liquid phase is connected to a liquid recovery system via a gas-liquid separator liquid phase outlet pipeline (53); the gas phase is transported to the VOCs treatment unit (7) via the gas-liquid separator gas phase outlet pipeline (52) via the VOCs delivery unit (6).

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