Train loading tail gas absorption device and absorption method thereof

Abstract

The invention discloses an absorption device and an absorption method for train loading tail gas, and the absorption device comprises a gas supply device, an oil transportation device, an oil gas dehydrator, a diesel oil absorption tower, a diesel oil dehydrator, a decontamination oil tank and an oil discharge device, an exhaust port of the oil-gas dehydrator is communicated with a diesel oil absorption tower used for purifying and absorbing train loading tail gas, a liquid inlet of the diesel oil absorption tower is communicated with an oil conveying device used for conveying diesel oil, an exhaust port of the diesel oil absorption tower is communicated with RTO equipment used for further treating purified gas, and a diesel oil outlet is formed in the lower portion of the diesel oil absorption tower. And the diesel oil dehydrator is communicated with the diesel oil dehydrator for dehydrating the diesel oil. The device is high in height, low in early-stage investment cost, small in volume, easy to maintain, low in operation cost and capable of generating huge economic benefits; according to the absorption method of the device, high-precision absorption can be carried out, and the problem of entrainment of gas at an outlet can be effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of train loading exhaust gas absorption treatment, in particular to a train loading exhaust gas absorption device and an absorption method thereof. Background Art

[0002] In recent years, with the acceleration of urbanization and the increase in transportation demand, train transportation has become one of the important modes of passenger and freight transportation. However, the environmental problems caused by train loading exhaust emissions have become increasingly prominent, and volatile organic compounds (VOCs), the main component of train loading exhaust, have gradually entered people's field of vision.

[0003] Compared with traditional gaseous pollutants such as sulfur dioxide, the composition and types of VOCs are more complex. They include hydrocarbons, esters, aldehydes, etc., and hydrocarbons include alkanes, olefins, aromatic hydrocarbons, etc. VOCs have a bad smell and are irritating. To a certain extent, they can damage the human respiratory system, cause damage to the central nervous system, and reduce memory. VOCs also contain some carcinogenic, teratogenic, and mutagenic chemicals.

[0005] In recent years, policies have paid more and more attention to the governance of VOCs. A large number of standards and regulations have been gradually introduced, including the "Guidelines for the Investigation of VOCs Pollution Sources in Petrochemical Enterprises", "Petrochemical Industry Pollutant Emission Standards", and "Petroleum Refining Industry Pollutant Emission Standards". These standards and regulations have put forward more stringent requirements for the emission control of atmospheric pollutants in petrochemical enterprises. The governance task has become increasingly arduous, which has also spawned a huge governance market capacity and a wide variety of VOCs governance technologies.

[0006] Currently in the market, VOCs control methods can be simply divided into two aspects: source control and end-of-pipe control.

[0007] Enterprises control the emission sources by adjusting production technology, upgrading equipment, and standardizing and refining operations. While controlling the source of VOCs gas, some essential VOCs (volatile organic compounds) gas emissions need to be directed to the end for treatment.

[0008] At present, the technologies for end-of-pipe treatment are mainly divided into two categories: recovery technology and destruction technology. Recovery technology is to achieve emission reduction and treatment by recovering VOCs gas, and the methods include condensation, absorption, adsorption, and membrane separation; destruction technology is to decompose VOCs gas into non-toxic and harmless substances through chemical methods such as combustion or biochemical reactions such as microorganisms and then discharge them, including combustion and biodegradation. However, each technology is difficult to deal with the complex composition of train loading exhaust gas. Summary of the invention

[0009] The purpose of the present invention is to provide an absorption device for train loading exhaust gas and an absorption method thereof, the device has high efficiency, low initial investment cost, small size, easy maintenance, low operating cost, and can generate huge economic benefits; the absorption method of the device can perform high-precision absorption and can effectively solve the problem of entrainment of outlet gas mist.

[0010] The technical solution adopted by the present invention to solve its technical problem is: a train loading exhaust gas absorption device, whose structure includes an air supply device, an oil delivery device, an oil and gas dehydrator, a diesel absorption tower, a diesel dehydrator, a decontamination oil tank, an oil discharge device and a decontamination oil tank, the air supply device is connected to the oil and gas dehydrator used to dehydrate the train loading exhaust gas, the liquid outlet of the oil and gas dehydrator is connected to the decontamination oil tank used to treat the removed liquid, the exhaust port of the oil and gas dehydrator is connected to the diesel absorption tower used to purify and absorb the train loading exhaust gas, the liquid inlet of the diesel absorption tower is connected to the oil delivery device for conveying diesel, the exhaust port of the diesel absorption tower is connected to the RTO equipment for further processing the purified gas, the liquid outlet of the diesel absorption tower is connected to the diesel dehydrator 8 through a pipeline, and the liquid outlet of the diesel dehydrator is connected to the decontamination oil tank through a pipeline.

[0011] Furthermore, the air supply device includes a second heat exchanger, and the tail gas is input into the oil and gas dehydrator after heat exchange in the second heat exchanger.

[0012] Furthermore, the oil and gas dehydrator includes an oil and gas dehydrator shell, a rotary spray absorber, a diversion distribution module 1, a train loading exhaust gas inlet, an exhaust port, a defogger module, and a partition plate; a downcomer and a drain port, the downcomer is arranged in the shell, the defogger module is arranged at the upper part of the inner cavity of the oil and gas dehydrator shell, a partition plate is respectively arranged at the upper and lower parts of the inner cavity of the oil and gas dehydrator shell, a diversion distribution module is arranged above the lower part of the inner cavity of the oil and gas dehydrator shell, a rotary spray absorber is arranged above the diversion distribution module 1, the drain port is arranged at the lower end of the oil and gas dehydrator shell, the exhaust port is arranged at the upper end of the oil and gas dehydrator shell, and the train loading exhaust gas inlet is arranged on one side of the oil and gas dehydrator shell and corresponds to the diversion distribution module 1.

[0013] Furthermore, the demisting module includes a corrugated baffle module and a fiber condensation module, and the corrugated baffle module and the fiber condensation module are respectively connected to the inner wall of the shell through a fixed module assembly.

[0014] Furthermore, the diesel absorption tower includes a diesel absorption tower shell, a diesel inlet, a rotary spray absorber, a diversion distribution module 2, an inlet for a gas to be treated, an outlet for a purified gas, a corrugated baffle module, a fiber condensation module, a partition plate, a downcomer and a drain port. The diesel absorption tower shell is provided with a corrugated baffle module, a fiber condensation module, a rotary spray absorber, a diversion distribution and liquid removal module, a partition plate for fixing the module and a downcomer connected to the partition plate from top to bottom. The diesel inlet is provided on one side of the shell, a purified gas outlet is provided at the upper end of the diesel absorption tower shell, a drain port is provided at the lower end of the diesel absorption tower shell, and the inlet for a gas to be treated is provided at the lower middle part of one side of the diesel absorption tower shell and corresponds to the diversion distribution and liquid removal module.

[0015] Furthermore, the rotary jet absorber includes a rotary jet absorber shell, an inlet for gas to be treated, a jacket, an overflow pipe and a rotary jet drain port. The jacket is arranged on the outside of the rotary jet absorber shell, and a cavity structure capable of accommodating diesel is formed between the inner surface of the jacket and the outer surface of the cylinder. The overflow pipe is arranged at the upper part of the inner cavity of the rotary jet absorber shell, and a rotary jet drain port is provided at the lower end of the rotary jet absorber shell.

[0016] Furthermore, the diesel dehydrator includes a diesel dehydrator housing, a diesel inlet, a coarse-grained fiber module, a corrugated baffle module, a fiber condensation module, a diesel outlet, a fixed module assembly and a drain port. The inner cavity of the diesel dehydrator housing is provided with a coarse-grained fiber module, a corrugated baffle module and a fiber condensation module from left to right, and the corrugated baffle module and the fiber condensation module are respectively connected to the inner wall of the diesel dehydrator housing through the fixed module assembly. The diesel inlet is provided at the left end of the diesel dehydrator housing, and a diesel outlet is provided at the upper side of one side of the diesel dehydrator housing, and a drain port is provided at the lower side.

[0017] Furthermore, the oil delivery device includes a heat exchanger and a refrigerator, the heat exchanger and the refrigerator are connected through a pipeline, the output end of the refrigerator is connected to the diesel absorption tower through a pipeline, and the lean diesel is input into the diesel absorption tower after heat exchange by the heat exchanger and cooling by the refrigerator.

[0018] The absorption method of the train loading exhaust gas absorption device includes the following steps:

[0019] S01, oil and gas dehydration: the train loading tail gas is input into the oil and gas dehydrator and initially dehydrated through the diversion distribution module. The gas is blocked by the partition plate and then enters the rotary spray absorber for secondary dehydration. The gas passes through the overflow pipe of the rotary spray absorber and is initially separated by the impact of the top buffer cap. Thereafter, the upward gas enters the corrugated baffle module and the fiber condensation module for deep separation. The droplets gradually accumulate in the module and flow into the liquid accumulation area at the bottom of the shell through the downcomer to be discharged. The dehydrated gas enters the diesel absorption tower;

[0020] S02, diesel absorption: the gas to be treated after dehydration by the oil and gas dehydrator is input into the diesel absorption tower and then initially deliquored through the diversion distribution module. At the same time, the diesel enters the diesel absorption tower and is transported to the jacket of the rotary jet absorber through the distribution pipe. The gas is blocked by the partition plate and then enters the rotary jet absorber to be fully mixed with the diesel for three-level micro-interface oscillation absorption. The droplets fall into the liquid accumulation area at the bottom of the shell along the liquid leg of the rotary jet absorber. The gas passes through the overflow pipe of the rotary jet absorber and is initially separated by the impact of the top buffer cap. Thereafter, the upward gas enters the corrugated baffle module and the fiber condensation module for deep separation. The droplets gradually accumulate in the module and converge into the liquid accumulation area at the bottom of the shell through the downcomer to be discharged from the device;

[0021] S03, reuse and discharge: the purified gas discharged from the diesel absorption tower is sent to the RTO device for subsequent treatment. The diesel collected at the bottom of the shell is transported to the diesel dehydrator through the oil discharge device for deliquescence, and the liquid is collected in the discharge device at the bottom of the shell. The dehydrated diesel is transported to the subsequent device for tri-hydrogenation treatment.

[0022] Beneficial effects of the present invention:

[0023] The train loading exhaust gas absorption device provided by the present invention has the following beneficial effects:

[0024] (1) The present invention adds an oil and gas dehydration process before the diesel absorption tower, so that the liquid content of the final outlet gas is further reduced to achieve secondary separation and dehydration, thereby improving the purification effect of the system.

[0025] (2) The diesel absorption tower of the present invention adopts the cyclone absorption technology. Compared with the two-phase flow type in the traditional gas-liquid mass transfer equipment, the present equipment has the strong interaction phenomenon between the liquid phase jet and the gas cyclone. Under different operating conditions, the gas cyclone field can transform the liquid jet from a steady-state jet into an atomized cyclone jet, thereby increasing the effective interphase area for mass transfer between the gas and liquid phases. At the same time, due to the strong interaction between the two phases, the mass transfer coefficient of the gas film and the liquid film will also be improved, and the total interphase mass transfer coefficient will be increased. Since the relative velocity and shear force between the gas and the liquid are increased, as well as the effective interphase area and the mass transfer coefficient are increased, the mass transfer efficiency is high, the equipment size is small, and it also has the advantages of simple structure, no internal moving parts, wide adaptability, self-cleaning, and no fear of clogging and scaling.

[0026] (3) The internal modules of the train loading exhaust gas absorption device of the present invention are all detachable and easy to clean or replace during maintenance.

[0027] (4) The train loading exhaust gas absorption device of the present invention has high reliability, is easy to maintain, has no waste, and has extremely low operating costs.

[0028] The train loading exhaust gas absorption method provided by the present invention mainly has the following beneficial effects:

[0029] (1) The gas-liquid mass transfer method of the present invention converts the liquid phase jet column into a large number of liquid droplets with smaller particle sizes, thereby increasing the liquid phase surface area and surface renewal frequency in the mass transfer space, greatly improving the gas-liquid mass transfer efficiency.

[0030] (2) The present invention adopts a diversion distribution liquid removal method at the air inlet, adopts a gas-liquid separation idea that combines centrifugal force and gravity, effectively realizes gas-liquid separation and gas distribution functions, can greatly reduce the volume of the current gas-liquid separator, strengthen gas-liquid mass transfer, and can significantly suppress and eliminate the problem of mist entrainment.

[0031] (3) The train loading exhaust gas absorption method of the present invention can realize the recovery and utilization of diesel and remove VOCs with high efficiency to maximize the utilization of the absorbent. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a train loading exhaust gas absorption device in a specific embodiment of the present invention;

[0033] Figure 2 is a structural schematic diagram of an oil and gas dehydrator in a specific embodiment of the present invention;

[0034] Figure 3 It is a structural schematic diagram of a diesel absorption tower in a specific embodiment of the present invention;

[0035] Figure 4 It is a structural schematic diagram of a diesel dehydrator in a specific embodiment of the present invention;

[0036] Figure 5 It is a structural schematic diagram of a rotary spray absorber in a specific embodiment of the present invention.

[0037] In the figure:

[0038] 1. Train loading exhaust gas; 2. Heat exchanger 1; 3. Refrigerant; 4. Heat exchanger 2;

[0039] 5. Oil and gas dehydrator; 501. Oil and gas dehydrator shell; 502. Spray absorber; 503. Diversion distribution module 1; 504. Train loading exhaust inlet; 505. Exhaust port; 506. Corrugated baffle module; 507. Fiber condensation module; 508. Partition plate; 509. Downcomer; 510. Drain port;

[0040] 6. Decontamination of oil tanks;

[0041] 7. Diesel absorption tower; 701. Diesel absorption tower shell; 702. Diesel inlet; 703. Rotary jet absorber; 7031. Rotary jet absorber shell; 7032. Inlet of gas to be treated; 7033. Jacket; 7034. Overflow pipe 7035. Rotary jet liquid discharge port; 704. Diversion distribution module II; 705. Inlet of gas to be treated; 706. Purified gas outlet; 707. Corrugated baffle module; 708. Fiber condensation module; 709. Partition plate; 710. Downcomer; 711. Liquid discharge port;

[0042] 8. Diesel dehydrator; 801. Diesel dehydrator shell; 802. Diesel inlet; 803. Coarse-grained fiber module; 804. Corrugated baffle module; 805. Fiber condensation module; 806. Diesel outlet; 807. Fixed module assembly; 808. Drain port;

[0043] 9. RTO device; 10. Decontamination oil tank. DETAILED DESCRIPTION

[0044] The following detailed description is made of a train loading exhaust gas absorption device and an absorption method thereof according to the present invention with reference to the accompanying drawings of the specification.

[0045] like Figures 1 to 5 As shown, the train loading exhaust gas absorption device proposed by the present invention includes an air supply device, an oil delivery device, an oil and gas dehydrator 5, a diesel absorption tower 7, a diesel dehydrator 8, a decontamination oil tank 6, an oil discharge device and a decontamination oil tank 10. The air supply device is connected to the oil and gas dehydrator 5 for dehydrating the train loading exhaust gas 1, the liquid outlet of the oil and gas dehydrator is connected to the decontamination oil tank 6 for treating the removed liquid, the exhaust port of the oil and gas dehydrator is connected to the diesel absorption tower 7 for purifying and absorbing the train loading exhaust gas 1, the liquid inlet of the diesel absorption tower 7 is connected to the oil delivery device for transporting diesel, the exhaust port of the diesel absorption tower 7 is connected to the RTO equipment 9 for further treating the purified gas, the liquid outlet of the diesel absorption tower 7 is connected to the diesel dehydrator 8 through a pipeline, and the liquid outlet of the diesel dehydrator 8 is connected to the decontamination oil tank 10 through a pipeline. The air supply device includes a heat exchanger 2 4, and the train loading exhaust gas 1 is input into the oil and gas dehydrator after heat exchange in the heat exchanger 2.

[0046] The oil and gas dehydrator 5 includes an oil and gas dehydrator shell 501, a rotary spray absorber 502, a diversion distribution module 1 503, a train loading exhaust inlet 504, an exhaust port 505, a defogger module, and a partition plate 508; a downcomer 509 and a drain port 510, wherein the downcomer 509 is arranged in the shell, the defogger module is arranged at the upper part of the inner cavity of the oil and gas dehydrator shell, and a partition plate 508 is respectively arranged at the upper and lower parts of the inner cavity of the oil and gas dehydrator shell, a diversion distribution module 503 is arranged above the lower part of the inner cavity of the oil and gas dehydrator shell, a rotary spray absorber 502 is arranged above the diversion distribution module 1, the drain port 510 is arranged at the lower end of the oil and gas dehydrator shell, the exhaust port 505 is arranged at the upper end of the oil and gas dehydrator shell, and the train loading exhaust inlet 504 is arranged on one side of the oil and gas dehydrator shell and corresponds to the diversion distribution module 1.

[0047] The demisting module includes a corrugated baffle module 506 and a fiber condensation module 507, and the corrugated baffle module and the fiber condensation module are respectively connected to the inner wall of the shell 501 through a fixed module assembly. The corrugated baffle module 506 includes a multi-layer arrangement of corrugated baffles arranged from bottom to top, and adopts a corrugated baffle with an oil-philic lower surface and a hydrophilic upper surface. When the airflow carrying droplets enters the channel of the corrugated baffle module, the direction of the airflow will change with the change of the channel direction of the corrugated baffle. Due to inertia, the direction of movement of the droplets carried in the airflow is not as easy to change as the airflow. The droplets will hit the baffle and adhere to the surface of the plate to form a water film. The liquid film moves forward with the airflow to the bend and is separated. Its multi-fold structure increases the chance of droplets being captured. The droplets that are not removed are captured at the next bend through the same action. Such repeated actions greatly improve the demisting efficiency. A flushing system is also provided inside the corrugated baffles. The flushing system includes flushing pipes, flushing nozzles, flushing water pumps, flushing water automatic switch valves, pressure instruments and flushing water flow meters. Its main function is to regularly flush away the liquid and solid sediments captured on the corrugated baffles, keep the plates clean and moist, and prevent blade scaling and channel blockage.

[0048] The material of the fiber condensation module 507 is a nanofiber mixed and woven with metal wire mesh and Teflon and other materials, which has excellent droplet capture performance, because this nanofiber mixed separator can provide a large specific surface area, which greatly improves the purity of liquid phase separation. When the airflow carrying droplets enters the fiber condensation module, the gas first enters the coalescence layer with a smaller filter hole diameter, and the small droplets carried are intercepted and adsorbed by the fiber on the surface of the coalescence layer. As the gas flows forward, the small droplets are sent to the deep fiber, collide with another small droplet and coalesce into a large droplet. As the droplets flow forward, the coalescence process is repeated, the filter hole diameter of the coalescence layer continues to increase, and the diameter of the droplets becomes larger and larger. When the gravity of the droplets is greater than the buoyancy of the gas, the droplets fall off from the outermost drainage layer, and the gas is discharged through the outer surface of the coalescence layer. The demisting structure is mainly used to capture droplets entrained in the airflow, which is an effective measure to improve separation efficiency, improve the operation of the tower and reduce pollution to the environment. The train loading exhaust gas absorption device of the present invention can make the outlet gas droplet content less than 50 mg / m3.

[0049] The diesel absorption tower 7 includes a diesel absorption tower shell 701, a diesel inlet 702, a rotary spray absorber 703, a diversion distribution module 2 704, a gas inlet 705 to be treated, a purified gas outlet 706, a corrugated baffle module 707, a fiber condensation module 708, a partition plate 709, a downcomer 710 and a liquid discharge port 711. The diesel absorption tower shell is provided with a corrugated baffle module 707, a fiber condensation module 708, a rotary spray absorber 703, a diversion distribution and liquid removal module 704, a partition plate 709 for fixing the module and a downcomer 710 connected to the partition plate from top to bottom. The diesel inlet 702 is provided on one side of the shell, a purified gas outlet 706 is provided on the upper end of the diesel absorption tower shell, and a liquid discharge port 711 is provided on the lower end of the diesel absorption tower shell. The gas inlet 705 to be treated is provided in the lower middle part of one side of the diesel absorption tower shell and corresponds to the diversion distribution and liquid removal module 704. The purified gas outlet 706 is cylindrical and connected to the RTO device 9 through a pipeline. A downcomer 710 is provided in the shell 701. Liquid droplets gradually accumulate in the module and flow into the liquid accumulation area at the bottom of the shell 701 through the downcomer 710. The oil and gas dehydrator 5 and the diesel absorption tower 7 are used to efficiently purify and remove the exhaust gas from train loading. The process is simple. At the same time, the diversion distribution and liquid removal module is provided, which can significantly suppress and eliminate the problem of mist entrainment.

[0050] The rotary jet absorber 703 includes a rotary jet absorber shell 7031, a gas inlet 7032 to be treated, a jacket 7033, an overflow pipe 7034 and a rotary jet liquid discharge port 7035, wherein the jacket is arranged outside the rotary jet absorber shell, a cavity structure capable of accommodating diesel is formed between the inner surface of the jacket and the outer surface of the cylinder, the overflow pipe is arranged at the upper part of the inner cavity of the rotary jet absorber shell, and a rotary jet liquid discharge port is arranged at the lower end of the rotary jet absorber shell. An injection hole capable of accommodating diesel injection into the cylinder is arranged on the outer peripheral surface of the rotary jet absorber shell 7031. The setting of the injection hole enables diesel injection into the rotary jet absorber shell 7031 of the rotary jet absorber 703 and forms a jet flow field. In a specific embodiment, there are multiple rotary jet absorbers 703, and each rotary jet absorber can be used in multi-stage series, and the user can select any number according to the use requirements.

[0051] The diesel dehydrator 8 comprises a diesel dehydrator housing 801, a diesel inlet 802, a coarse-grained fiber module 803, a corrugated baffle module 804, a fiber condensation module 805, a diesel outlet 806, a fixed module assembly 807 and a drain port 808. The inner cavity of the diesel dehydrator housing 801 is provided with a coarse-grained fiber module 803, a corrugated baffle module 804 and a fiber condensation module 805 from left to right, and the corrugated baffle module 804 and the fiber condensation module 805 are respectively connected to the inner wall of the diesel dehydrator housing 801 through the fixed module assembly 807. The diesel inlet is provided at the left end of the diesel dehydrator housing, and a diesel outlet is provided at the upper side of one side of the diesel dehydrator housing, and a drain port 808 is provided at the lower side.

[0052] The oil delivery device includes a heat exchanger 2 and a refrigerator 3. The heat exchanger is connected to the refrigerator through a pipeline. The output end of the refrigerator is connected to the diesel absorption tower 7 through a pipeline. The lean diesel is input into the diesel absorption tower 7 after heat exchange in the heat exchanger 2 and cooling in the refrigerator 3.

[0053] An absorption method for a train loading exhaust gas absorption device comprises the following steps:

[0054] S01. Oil and gas dehydration: The train loading exhaust gas 1 is input into the oil and gas dehydrator 5 and is initially dehydrated through the diversion distribution module 503. The gas is blocked by the partition plate and then enters the rotary spray absorber 502 for secondary dehydration. The gas passes through the overflow pipe of the rotary spray absorber 502 and is initially separated by the impact of the top buffer cap. Thereafter, the upward gas enters the corrugated baffle module 506 and the fiber condensation module 507 for deep separation. Liquid droplets are gradually accumulated in the module and converge into the liquid accumulation area at the bottom of the shell 501 through the downcomer 506 to discharge the dehydrated gas. The dehydrated gas enters the diesel absorption tower 7.

[0055] S02, diesel absorption: the untreated gas after dehydration by the oil and gas dehydrator 5 is input into the diesel absorption tower 7 and then initially deliquored through the diversion distribution module 704. Meanwhile, the diesel enters the diesel absorption tower 7 and is transported to the jacket 7033 of the rotary jet absorber 703 through the distribution pipe. The gas is blocked by the partition plate and then enters the rotary jet absorber 702 to be fully mixed with the diesel for three-level micro-interface oscillation absorption. The droplets fall into the liquid accumulation area at the bottom of the shell 701 along the liquid leg of the rotary jet absorber 703. The gas passes through the overflow pipe 7034 of the rotary jet absorber 703 and is initially separated by impact of the top buffer cap. Thereafter, the upward gas enters the corrugated baffle module 707 and the fiber condensation module 708 for deep separation. The droplets are gradually accumulated in the module and converge into the liquid accumulation area at the bottom of the shell 701 through the downcomer 710 to be discharged from the discharge device.

[0056] S03, reuse and discharge: the purified gas discharged from the diesel absorption tower 7 is sent to the RTO device 9 for subsequent treatment. The diesel collected at the bottom of the shell 701 is transported to the diesel dehydrator 8 through the oil discharge device for dehydration, and the liquid is discharged into the bottom discharge device of the shell 801. The dehydrated diesel is transported to the subsequent device for tri-hydrogenation treatment.

[0057] Further, in the above step S02, the rotary spray absorber 703 atomizes the diesel to form small droplets, and the gas is fully mixed with the diesel to perform three-level micro-interface oscillation absorption. Among them, it can be understood that "micro-interface oscillation absorption" produces an interface effect, and the interface effect refers to the physical and chemical phenomena that occur between two contacting substances due to the influence of surface energy. The micro-interface enhanced reactor increases the contact area between the reactant and the catalyst through a fine interface, thereby improving the reaction rate and efficiency. In this way, the reaction rate and efficiency of diesel and exhaust gas in the absorption device can be improved.

[0058] As a specific embodiment of the present invention, the train loading exhaust gas 1 and diesel after preliminary liquid removal enter the rotary spray absorber 703. Due to the mutual interference of the rotating turbulent field generated by the gas phase and the jet flow field generated by the liquid phase, the absorbent in the liquid phase is cut and atomized by the rotating turbulent field to form droplets with smaller diameters. The droplets contact with the train loading exhaust gas 1 to form a micro-interface reaction zone. As the reaction proceeds, the zone is continuously generated, evolved and disappeared, and the various VOCs waste gases that have escaped are fully absorbed. The diesel that has absorbed the VOCs waste gas flows out of the diesel absorption tower under the action of gravity and enters the diesel dehydrator 8 for subsequent treatment.

[0059] Furthermore, in the above step S02, the gas to be treated moves upward from the diversion distribution and liquid removal module 704 and is blocked by the partition plate before entering the rotary spray absorber 703.

[0060] Furthermore, when absorbing the train loading exhaust gas, the operating pressure drop in the absorption device needs to be controlled to be less than 3Kpa. In order to avoid the inadequate reaction affecting the purification effect, it can be understood that "pressure drop" refers to the pressure drop caused by energy loss when the fluid flows in the reaction vessel, and in the present invention, it refers to the pressure drop caused by energy loss when the loading exhaust gas 1 and diesel flow in the rotary spray absorber 703.

[0061] Operation parameters: inlet gas flow rate 3000m3 / h, operating temperature 40℃, design temperature 60℃, operating pressure 0.2MPa, design pressure 0.38MPa, inlet VOCs concentration is about 615.49g / m3. After being treated by the train loading exhaust diesel washing device of the present invention, the VOCs content in the purified outlet gas is less than 15g / m3, the outlet gas liquid volume is less than 50mg / m3, the pressure drop of the train loading exhaust diesel washing device of the present invention is less than 3Kpa, the service life of the internal parts is not less than 8 years, and the service life of the equipment is extended.

[0062] The above description is only used to illustrate some principles of the present invention. This specification is not intended to limit the present invention to the specific structure and application scope shown and described. Therefore, all corresponding modifications and equivalents that may be used belong to the patent scope applied for by the present invention.

[0063] Except for the technical features described in the specification, the other technical features are known technologies to those skilled in the art.

Claims

1. A train loading exhaust gas absorption device, characterized in that: The invention comprises an air supply device, an oil delivery device, an oil-gas dehydrator (5), a diesel absorption tower (7), a diesel dehydrator (8), a decontamination oil tank (6), an oil discharge device and a decontamination oil tank (10), wherein the air supply device is connected to the oil-gas dehydrator (5) for dehydrating the train loading tail gas (1), the liquid outlet of the oil-gas dehydrator is connected to the decontamination oil tank (6) for treating the removed liquid, the exhaust port of the oil-gas dehydrator is connected to the diesel absorption tower (7) for purifying and absorbing the train loading tail gas (1), the liquid inlet of the diesel absorption tower (7) is connected to the oil delivery device for transporting diesel, the exhaust port of the diesel absorption tower (7) is connected to the RTO equipment (9) for further treating the purified gas, the liquid outlet of the diesel absorption tower (7) is connected to the diesel dehydrator (8) through a pipeline, and the liquid outlet of the diesel dehydrator is connected to the decontamination oil tank (10) through a pipeline.

2. The train loading exhaust gas absorption device according to claim 1 is characterized in that: The air supply device comprises a second heat exchanger (4), and the tail gas is input into the oil and gas dehydrator after heat exchange in the second heat exchanger.

3. The train loading exhaust gas absorption device according to claim 1 is characterized in that: The oil-gas dehydrator (5) comprises an oil-gas dehydrator shell (501), a rotary spray absorber (502), a flow diversion distribution module (503), a train loading exhaust gas inlet (504), an exhaust port (505), a demisting module, a partition plate (508); a downcomer (509) and a drain port (510), wherein the downcomer (509) is arranged in the shell, the demisting module is arranged at the upper part of the inner cavity of the oil-gas dehydrator shell, and the upper and lower parts of the inner cavity of the oil-gas dehydrator shell are A partition plate (508) is provided in each of the two parts, a flow guide distribution module (503) is provided above the partition plate in the lower part of the inner cavity of the oil and gas dehydrator shell, a rotary spray absorber (502) is provided above the flow guide distribution module one, the drain port (510) is provided at the lower end of the oil and gas dehydrator shell, the exhaust port (505) is provided at the upper end of the oil and gas dehydrator shell, and the train loading exhaust gas inlet (504) is provided on one side of the oil and gas dehydrator shell and corresponds to the flow guide distribution module one.

4. The train loading exhaust gas absorption device according to claim 3 is characterized in that: The demisting module includes a (506) corrugated deflection module and a (507) fiber condensation module, and the corrugated deflection module and the fiber condensation module are respectively connected to the inner wall of the shell (501) through a fixed module assembly.

5. The train loading exhaust gas absorption device according to claim 1 is characterized in that: The diesel absorption tower (7) comprises a diesel absorption tower shell (701), a diesel inlet (702), a rotary spray absorber (703), a flow guide distribution module 2 (704), a gas inlet to be treated (705), a purified gas outlet (706), a corrugated baffle module (707), a fiber condensation module (708), a partition plate (709), a downcomer (710) and a liquid discharge port (711), wherein the diesel absorption tower shell is provided with the corrugated baffle module (707), the fiber condensation module (708) from top to bottom. ), a rotary spray absorber (703), a flow-guiding distribution and liquid removal module (704), a partition plate (709) for fixing the module, and a downcomer (710) connected to the partition plate, the diesel inlet (702) is arranged on one side of the shell, the upper end of the diesel absorption tower shell is provided with a purified gas outlet (706), the lower end of the diesel absorption tower shell is provided with a drain port (711), and the inlet (705) for the gas to be treated is arranged at the lower middle part of one side of the diesel absorption tower shell and corresponds to the flow-guiding distribution and liquid removal module (704).

6. The train loading exhaust gas absorption device according to claim 5 is characterized in that: The rotary jet absorber (703) comprises a rotary jet absorber shell (7031), an inlet for gas to be treated (7032), a jacket (7033), an overflow pipe (7034) and a rotary jet liquid discharge port (7035); the jacket is arranged on the outside of the rotary jet absorber shell, a cavity structure capable of accommodating diesel is formed between the inner surface of the jacket and the outer surface of the cylinder, the overflow pipe is arranged at the upper part of the inner cavity of the rotary jet absorber shell, and a rotary jet liquid discharge port is provided at the lower end of the rotary jet absorber shell.

7. The train loading exhaust gas absorption device according to claim 1 is characterized in that: The diesel dehydrator comprises a diesel dehydrator housing (801), a diesel inlet (802), a coarse-grained fiber module (803), a corrugated baffle module (804), a fiber condensation module (805), a diesel outlet (806), a fixed module assembly (807) and a drain port (808). The inner cavity of the diesel dehydrator housing (801) is provided with a coarse-grained fiber module (803), a corrugated baffle module (804) and a fiber condensation module (805) from left to right, and the corrugated baffle module (804) and the fiber condensation module (805) are connected to the inner wall of the diesel dehydrator housing (801) through the fixed module assembly (807). The diesel inlet is arranged at the left end of the diesel dehydrator housing, and a diesel outlet is arranged at the upper side of one side of the diesel dehydrator housing, and a drain port (808) is arranged at the lower side.

8. The train loading exhaust gas absorption device according to claim 1 is characterized in that: The oil delivery device comprises a heat exchanger (2) and a refrigerator (3), wherein the heat exchanger and the refrigerator are connected via a pipeline, and the output end of the refrigerator is connected to a diesel absorption tower (7) via a pipeline, and lean diesel is input into the diesel absorption tower (7) after heat exchange by the heat exchanger (2) and temperature reduction by the refrigerator 3.

9. The method for absorbing exhaust gas from train loading according to any one of claims 1 to 8, characterized in that: Including the following steps: S01, oil and gas dehydration: the train loading tail gas (1) is input into the oil and gas dehydrator (5) and is initially dehydrated via the diversion distribution module (503). The gas is blocked by the partition plate and enters the rotary spray absorber (502) for secondary dehydration. The gas passes through the overflow pipe of the rotary spray absorber (502) and is initially separated by the impact of the top buffer cap. Thereafter, the upward gas enters the corrugated baffle module (506) and the fiber condensation module (507) for deep separation. Liquid droplets are gradually accumulated in the module and are discharged from the liquid accumulation area at the bottom of the shell (501) via the downcomer (506). The dehydrated gas enters the diesel absorption tower (7); S02, diesel absorption: the gas to be treated after dehydration by the oil and gas dehydrator (5) is input into the diesel absorption tower (7) and then initially deliquified through the diversion distribution module (704). At the same time, the diesel enters the diesel absorption tower (7) and is transported to the jacket (7033) of the rotary jet absorber (703) through the distribution pipe. The gas is blocked by the partition plate and then enters the rotary jet absorber (702) to be fully mixed with the diesel for three-level micro-interface oscillation absorption. The droplets fall into the liquid accumulation area at the bottom of the shell (701) along the liquid leg of the rotary jet absorber (703). The gas passes through the overflow pipe (7034) of the rotary jet absorber (703) and is initially separated by impact of the top buffer cap. Thereafter, the upward gas enters the corrugated baffle module (707) and the fiber condensation module (708) for deep separation. The droplets gradually accumulate in the module and flow into the liquid accumulation area at the bottom of the shell (701) through the downcomer (710) to be discharged from the device; S03, reuse and discharge: the purified gas discharged from the diesel absorption tower (7) is sent to the RTO device (9) for subsequent treatment. The diesel collected at the bottom of the shell (701) is transported to the diesel dehydrator (8) for dehydration through the oil discharge device, and the liquid is discharged into the discharge device at the bottom of the shell (801). The dehydrated diesel is transported to the subsequent device for tri-hydrogenation treatment.

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