Evaporation inhibition and carbon reduction device for oil product in storage tank

Abstract

The invention relates to a storage tank oil evaporation inhibition and carbon reduction device. The device mainly comprises a storage tank, a steam recovery tank, a solar panel, a storage battery, a pressure adjusting air bag, a steam outlet pipe, an acquisition and control module, an air blower, a pressure sensor and the like. The semiconductor chilling plate is used for strengthening steam condensation and liquefaction, the vibration module is used for promoting liquid to slide off, the air space of the air bag automatically expands and contracts along with the pressure change of the storage tank, and a closed self-circulation breathing system is formed. During normal work, steam loss is avoided, external air cannot enter the storage tank, flammable and explosive gas mixtures cannot be formed, safety is improved, and human intervention is not needed during operation. Electric power is provided by the solar panel, external power equipment is not needed, extra energy consumption is not needed, steam zero emission can be achieved, and the device belongs to a low-carbon environment-friendly device and is wide in application and popularization prospect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of energy saving and carbon reduction, and particularly relates to a storage tank evaporation inhibition device based on pressure automatic adjustment and enhanced condensation, aiming to reduce storage tank oil vapor loss, improve storage tank storage safety, and reduce carbon emissions. BACKGROUND

[0002] In the field of industrial production, volatile organic compounds (VOCs) have serious harm to human health and also cause the increase of atmospheric carbon content. In the petrochemical industry, the storage tank area is one of the important sources of VOCs in the industrial field due to its special storage process and material characteristics. The "breathing loss" of the storage tank is divided into "large breathing" and "small breathing", which is an important reason for oil loss and quality decline. "Small breathing" loss occurs during the static storage stage of oil products. When the wind speed, temperature and concentration of the external environment change, the pressure in the gas phase space above the storage tank will change accordingly. The change of the pressure in the gas phase space will cause the exchange of gas through the breather valve, thereby causing the evaporation of oil products, resulting in oil loss and quality decline. "Large breathing" loss is that when oil is received, oil products enter the storage tank continuously, the liquid level of the oil products in the tank rises, and the gas phase space above the tank decreases, so the pressure in the gas phase space increases, causing oil vapor to be discharged from the storage tank through the breather valve; when oil is discharged, the liquid level of the oil products in the tank continuously decreases, the gas phase space above the tank increases, and the pressure in the gas phase space decreases, causing external air to enter the storage tank through the breather valve. Evaporation loss not only causes economic loss of raw materials, but also causes oil quality deterioration. On the one hand, the escape of light components will increase the relative content of gum substances and reduce the stability of oil products; on the other hand, the evaporation of low octane components in some oil products will also reduce their anti-knock performance, accelerate oxidation reaction, and generate precipitates, affecting the normal use of the engine.

[0003] At present, the main technical methods for oil and gas recovery at home and abroad are adsorption method, absorption method and condensation method.

[0004] The principle of absorption method is to input the discharged oil vapor into an absorption tower, so that the oil vapor fully contacts with the absorption liquid in the absorption tower, and most of the hydrocarbon components are dissolved in the absorption liquid. The absorption liquid containing dissolved organic hydrocarbons needs to be regenerated or back-refined.

[0005] The adsorption method is based on the selective adsorption characteristics of the adsorbent for organic hydrocarbon components and air in the oil and gas mixture, so that the organic hydrocarbon component gas is adsorbed in the adsorbent, and then the hydrocarbon components attached to the adsorbent are desorbed by forming negative pressure through a vacuum system, and the hydrocarbon components are recovered through subsequent processes. The adsorbent is generally activated carbon, and materials such as silica gel can also be used. The recovery device is usually composed of two adsorption tanks filled with adsorbent. When one tank is in the "adsorption" state, the other tank is "regenerated" by a vacuum pump.

[0006] Condensation method is a kind of method that the collected oil gas is continuously cooled in multiple stages, so that most of the hydrocarbon vapor pressure in the oil gas reaches supersaturation state and is condensed into liquid state, thereby realizing oil gas recovery. The recovered oil is pumped back to the storage tank.

[0007] The existing storage tank vapor recovery method is complex, requires a large number of supporting equipment, has high investment cost and high operation energy consumption. In order to overcome the defects of the prior art, the present application provides a storage tank evaporation suppression device, which can reduce the evaporation rate by reducing the vapor space of the storage tank through the inflatable air bag floating on the liquid surface, and can ensure the safety of the storage tank by adjusting the pressure. The device uses a refrigeration semiconductor to cool a large amount of oil vapor generated in the storage tank, and the condensed vapor returns to the storage tank as liquid droplets, forming a storage tank evaporation suppression self-circulation system, achieving zero VOCs emission, and contributing to the double carbon goal. SUMMARY

[0008] The present application relates to a kind of storage tank oil evaporation suppression carbon reduction device, mainly including storage tank, vapor recovery tank, solar panel, battery, pressure regulating air bag, vapor outlet pipe, control module, air blower and pressure sensor;The vapor recovery tank is installed above the tank top plate of storage tank, and the upper part thereof is a cylindrical body, and the lower part is a conical body;The top of cylindrical body is closed by a metal cover plate, the cylindrical body is filled with wire mesh, and the inside of the wire mesh is arranged with vibration module, and the outer wall surface of the cylindrical body is uniformly arranged with a plurality of semiconductor refrigerating pieces;The bottom of conical body is provided with a condensate return pipe;The outer wall center of the metal cover plate at the top of vapor recovery tank is provided with a support rod, the battery is installed in the middle of support rod, and the solar panel is arranged at the end of support rod.

[0009] The inlet of the vapor outlet pipe is connected with the gas space above the inside of the storage tank, and the outlet enters the inside of the cylindrical body in a tangent direction along the wall surface of the cylindrical body of the vapor recovery tank;The pressure sensing tube of the pressure sensor is connected with the vapor outlet pipe.

[0010] The pressure regulating air bag is located in the inside of the storage tank and floats above the liquid surface of the storage tank, and the top of the pressure regulating air bag is provided with a flexible hose.

[0011] The air blower has gas conveying and air pumping functions, and the outlet of the air blower is provided with an air pipe, the outlet of the air pipe is connected with the inlet of the flexible hose, and the air pipe is provided with a control valve.

[0012] The control module and the air blower are installed on the tank top plate of the storage tank, the battery supplies power to the control module through a metal cable, and the control module is connected with the air blower, the pressure sensor, the control valve, the vibration module and the semiconductor refrigerating pieces through control lines.

[0013] The pressure regulating air bag is a circular hollow elastic shell, and the materials are oil and gas corrosion resistant rubber, which can freely stretch and deform; the condensate return pipe is located in the central cavity of the pressure regulating air bag, the central cavity has a diameter of about 1.05-1.1 times of the outer diameter of the condensate return pipe, and the pressure regulating air bag can move up and down along the condensate return pipe when stretching and deforming.

[0014] The condensate return pipe penetrates the tank top of the storage tank and extends into the interior of the storage tank, is arranged along the central axis of the storage tank, and has an outlet end fixed on the tank bottom plate of the storage tank, and a plurality of liquid discharge holes are arranged on the pipe wall of the outlet end of the condensate return pipe.

[0015] The steam outlet pipe is provided with a flame arrester, a check valve, an overpressure valve, and a vacuum valve. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the present application;

[0017] Figure 2 is a schematic diagram of the steam recovery tank of the present application;

[0018] Figure 3 is a bottom view of the steam recovery tank of the present application;

[0019] Figure 4 is a schematic diagram of the pressure regulating air bag of the present application;

[0020] Figure 5 is a top view of the pressure regulating air bag of the present application;

[0021] Figure 6 is a schematic diagram of the system working process when the steam pressure in the storage tank rises;

[0022] Figure 7 is a schematic diagram of the system working process when the steam pressure in the storage tank decreases.

[0023] 1-storage tank; 2-steam recovery tank; 3-solar panel; 4-battery; 5-pressure regulating air bag; 6-steam outlet pipe; 7-control module; 8-blower; 9-pressure sensor; 10-cylinder; 11-cone; 12-metal wire mesh; 13-vibration module; 14-semiconductor refrigeration sheet; 15-condensate return pipe; 16-supporting rod; 17-flexible hose; 18-ventilation pipe; 19-control valve; 20-liquid discharge hole; 21-flame arrester; 22-check valve; 23-overpressure valve; 24-vacuum valve; 25-tank top plate; 26-central cavity. DETAILED DESCRIPTION

[0024] As Figure 1As shown, the present application relates to a kind of carbon reduction devices for inhibiting evaporation of oil products in storage tank, mainly including storage tank 1, vapor recovery tank 2, solar panel 3, battery 4, pressure regulating air bag 5, vapor outlet pipe 6, control module 7, air blower 8 and pressure sensor 9 and so on.

[0025] As shown in Figure 2 , the upper part of the vapor recovery tank 2 is a cylindrical body 10, and the lower part is a conical body 11; the top of the cylindrical body 10 is closed by a metal cover plate, the cylindrical body 10 is filled with a wire mesh 12, and the inside of the wire mesh 12 is arranged with a vibration module 13; the outer wall surface of the cylindrical body 10 is uniformly arranged with a plurality of semiconductor refrigerating fins 14; the bottom of the conical body 11 is provided with a condensate return pipe 15; the metal cover plate of the vapor recovery tank 2 is provided with a support rod 16 at the center of the outer wall, the battery 4 is installed in the middle part of the support rod 16, and the solar panel 3 is arranged at the end of the support rod 16.

[0026] As shown in Figure 1 , Figure 3 , the inlet of the vapor outlet pipe 6 is communicated with the gas space above the inside of the storage tank 1, and the outlet enters the inside of the cylindrical body 10 along the tangential direction of the wall surface of the cylindrical body 10 of the vapor recovery tank 2; the pressure sensing pipe of the pressure sensor 9 is communicated with the vapor outlet pipe 6.

[0027] The pressure regulating air bag 5 is located in the inside of the storage tank 1 and floats above the liquid surface of the storage tank 1, and the top of the pressure regulating air bag 5 is provided with a flexible hose 17.

[0028] The blade of the air blower 8 can be forward and reverse rotated, and has the functions of gas conveying and gas pumping, and the outlet of the air blower 8 is provided with an air pipe 18, the outlet of the air pipe 18 is connected with the inlet of the flexible hose 17, and the air pipe 18 is provided with a control valve 19.

[0029] The control module 7 and the air blower 8 are both installed on the tank top plate 25 of the storage tank 1, the battery 4 supplies power to the control module 7 through a metal cable, and the control module 7 is connected with the air blower 8, the pressure sensor 9, the control valve 19, the vibration module 13 and the semiconductor refrigerating fin 14 through control lines respectively.

[0030] The pressure regulating air bag 5 is a circular annular hollow elastic shell, and the material is oil and gas corrosion resistant rubber, which can freely stretch and deform; the condensate return pipe 15 is located in the center cavity 26 of the pressure regulating air bag 5, the diameter of the center cavity 26 is about 1.05-1.1 times of the outer diameter of the condensate return pipe 15, and the pressure regulating air bag 5 can move up and down along the condensate return pipe 15 when it stretches and deforms.

[0031] The condensate return pipe 15 penetrates through the tank top plate 25 of the storage tank 1 and goes deep into the inside of the storage tank 1, and is arranged along the central axis of the storage tank 1, the outlet end of the condensate return pipe 15 is fixed on the tank bottom plate of the storage tank 1, and a plurality of liquid discharge holes 20 are arranged on the end pipe wall.

[0032] The steam outlet pipe 6 is provided with a flame arrester 21, a check valve 22, an overpressure valve 23, and a vacuum valve 24.

[0033] The working principle of the application is explained as follows:

[0034] As Figure 6 The system working process diagram when the steam pressure in the storage tank rises is shown. When the storage tank 1 receives oil and the liquid level rises, the gas space above the storage tank 1 decreases, and the steam pressure in the storage tank 1 rises. When the steam pressure is greater than the working pressure of the storage tank 1, the oil vapor will enter the steam outlet pipe 6 from the storage tank 1. The oil vapor enters the steam recovery tank 2 through the steam outlet pipe 6. The tangential inlet design causes the steam to generate a spiral flow when it rises in the steam recovery tank 2, which promotes the separation of the condensed liquid under the action of centrifugal force. The electric energy from the solar panel 3 is stored in the battery 4, and under the control of the control module 7, it is supplied to the semiconductor refrigeration sheet 14. After the semiconductor refrigeration sheet 14 passes through the direct current, it provides cold energy to the steam recovery tank 2. The oil vapor will exchange heat with the inner wall of the steam recovery tank 2, and when the temperature is lower than the dew point of the oil vapor hydrocarbon, the oil vapor will be liquefied. When the oil vapor rises in a spiral shape, it will collide with the metal wire mesh 12, and a liquid film will be continuously formed on the surface of the metal wire mesh 12. The vibration module 13 drives the metal wire mesh 12 to vibrate, promoting the condensate to slide off. The liquid droplets drop to the conical body 13 under the action of the vibration module 13 and gravity, and a liquid film is formed on the tank wall of the conical body 13. The condensed liquid is guided to flow into the oil liquid phase below the gas-liquid interface of the storage tank 1 through the condensed liquid recovery pipe 15. At the same time, the pressure sensor 9 on the steam outlet pipe 6 transmits the pressure signal to the control module 7 through the control line, and controls the air blower 8 to exhaust the pressure regulating air bag 5. As the amount of air in the air bag gradually decreases, the volume of the air bag continuously decreases, and the pressure of the gas space of the storage tank 1 slowly decreases, until the pressure of the pressure regulating air bag 5 and the gas space of the storage tank 1 is balanced, and the air blower 8 stops exhausting. If the steam pressure in the storage tank 1 exceeds the pressure limit of the storage tank 1, the overpressure valve 23 on the steam outlet pipe 6 automatically opens to release pressure to ensure safety.

[0035] As Figure 7The diagram illustrates the system's operation when the steam pressure inside the storage tank decreases. When oil is released from storage tank 1, causing the liquid level to drop, the gas phase space above storage tank 1 increases, and the oil vapor pressure decreases. When the oil vapor pressure is lower than the working pressure of storage tank 1, pressure sensor 9 transmits the pressure signal of storage tank 1 to the data acquisition and control module 7, which controls blower 8 to supply gas to pressure regulating bladder 5. Pressure regulating bladder 5 covers the liquid surface. As the amount of gas in the bladder gradually increases, the volume of the bladder continuously increases, the gas phase space in storage tank 1 gradually decreases, and the gas phase evaporation rate decreases until the pressure of pressure regulating bladder 5 and the gas phase space of storage tank 1 are balanced, at which point blower 8 stops supplying gas. A check valve 22 is installed on the steam outlet pipe 6 to prevent backflow from the steam recovery tank 2 due to low steam pressure in storage tank 1. When the vacuum degree of storage tank 1 exceeds the safety limit, vacuum valve 24 located on steam outlet pipe 6 automatically opens, allowing outside air to enter storage tank 1, preventing damage to storage tank 1 due to excessive vacuum.

[0036] In practical applications, the number of semiconductor cooling chips 14 can be adjusted as needed. Simultaneously, one steam recovery tank 2 can be connected to multiple storage tanks 1, forming a large oil and gas recovery network. This allows steam from any storage tank 1 containing the same type of oil to enter the steam recovery tank 2 and other connected recovery tanks, thereby improving the overall steam balance control effect.

[0037] Compared to traditional oil and gas recovery technologies, this invention relies on a semiconductor cooling chip 14 on the outside of the steam recovery tank 2 to enhance steam condensation and liquefaction, a vibration module 13 to promote the sliding of condensed liquid, and a pressure regulating airbag 5 to reduce the vapor phase space in the storage tank 1 and lower the evaporation rate, forming a closed, self-circulating breathing system. When the pressure in the vapor phase space of the storage tank 1 changes, outside air exchanges gases with the airbag but does not directly enter the storage tank 1. Therefore, there is no steam loss during normal operation, and the storage tank 1 is air-free, preventing the formation of flammable and explosive gas mixtures, thus improving safety. Simultaneously, electricity is provided by solar panels, eliminating the need for external power equipment. The expansion and contraction of the airbag are autonomously controlled by pressure changes within the storage tank 1, requiring no human intervention or additional energy consumption during operation, achieving zero steam emissions and realizing energy conservation and carbon reduction.

Claims

1. A carbon reduction device for inhibiting evaporation of oil products in a storage tank, characterized by comprising: The utility model relates to a kind of solar energy steam recovery device, including: Storage tank (1), steam recovery tank (2), solar panel (3), battery (4), pressure regulating air bag (5), steam outlet pipe (6), control module (7), air blower (8) and pressure sensor (9) etc.;The steam recovery tank (2) is installed on the tank top plate (25) of storage tank (1) above, and its upper part is cylindrical body (10), and lower part is conical body (11);The top of cylindrical body (10) is closed by metal cover plate, and cylindrical body (10) is filled with wire mesh (12), and vibration module (13) is arranged inside wire mesh (12), and the outer wall surface of cylindrical body (10) is uniformly arranged with several semiconductor refrigerating sheet (14);Conical body (11) bottom is equipped with condensate backflow pipe (15);The outer wall center of the metal cover plate of steam recovery tank (2) top is equipped with support rod (16), and battery (4) is installed in the middle of support rod (16), and solar panel (3) is arranged at the end of support rod (16). The inlet of steam outlet pipe (6) is communicated with the gas space above the inside of storage tank (1), and its outlet enters the inside of cylindrical body (10) along the tangent direction of the wall surface of cylindrical body (10) of steam recovery tank (2);The pressure sensing pipe of pressure sensor (9) is communicated with steam outlet pipe (6). Fire arrestor (21), check valve (22), overpressure valve (23) and vacuum valve (24) are arranged on steam outlet pipe (6). Pressure regulating air bag (5) is located in the inside of storage tank (1), and floats above the liquid level of storage tank (1), and the top of pressure regulating air bag (5) is equipped with flexible hose (17). Air blower (8) has gas conveying and air pumping functions, and its outlet is equipped with air pipe (18), and the outlet of air pipe (18) is connected with the inlet of flexible hose (17), and control valve (19) is arranged on air pipe (18).

2. A carbon reduction device for inhibiting evaporation of oil products in a storage tank according to claim 1, characterized in that: Control module (7) and air blower (8) are both installed on the tank top plate (25) of storage tank (1), battery (4) supplies power to control module (7) through metal cable, and control module (7) is connected with air blower (8), pressure sensor (9), control valve (19), vibration module (13) and semiconductor refrigerating sheet (14) through control line.

3. A carbon deposit reducing device for inhibiting evaporation of oil products in a storage tank according to claim 1, characterized in that: Pressure regulating air bag (5) is circular hollow elastic shell, and the material is oil and gas corrosion resistant rubber, which can freely stretch and deform;Condensate backflow pipe (15) is located in the center cavity (26) of pressure regulating air bag (5), and the diameter of center cavity (26) is about 1.05~1.1 times of the outer diameter of condensate backflow pipe (15), and pressure regulating air bag (5) can move up and down along condensate backflow pipe (15) when stretching and deforming.

4. The carbon reduction device for inhibiting evaporation of oil products in a storage tank according to claim 1, characterized by: Condensate backflow pipe (15) penetrates the tank top of storage tank (1) and goes into the inside of storage tank (1), and is arranged along the central axis of storage tank (1), and its outlet end is fixed on the tank bottom plate of storage tank (1), and a plurality of liquid discharge holes (20) are arranged on the end pipe wall.

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