System for removing basic nitride in oil product

Abstract

The utility model relates to the technical field of denitrification process of raw oil, and discloses a system for removing basic nitrides in an oil product, which is suitable for removing basic nitrides in hydrogenated distillate oil and comprises a mixer, an electric refining tank, a first filter and a second filter which are sequentially communicated to form a denitrification path, wherein the feeding end of the mixer is communicated with an oil storage tank and a denitrifying agent tank, and the mixer is suitable for mixing a denitrifying agent and an oil product; the denitrified oil discharging end of the electric refining tank is communicated with the first filter, the first filter is suitable for filtering nitrogen residues in the denitrified oil, and the second filter is suitable for filtering a denitrifying agent and the nitrogen residues in the denitrified oil. According to the utility model, an oil product sequentially passes through the first filter and the second filter after passing through the electric refining tank, the first filter is used for filtering nitrogen slag with larger particle size in the denitrified oil, and the second filter is used for filtering a denitrifying agent which is not completely reacted and nitrogen slag which is not filtered by the first filter in the denitrified oil, so that the filtering effect of the denitrified oil is improved; therefore, the quality of a denitrified oil finished product is improved.

Description

Technical Field

[0001] This utility model relates to the field of denitrification technology for crude oil, specifically to a system for removing alkaline nitrogen compounds from oil products. Background Technology

[0002] Currently, in the process of removing alkaline nitrogen compounds from hydrotreated distillate oil using complexation denitrification technology, the oil is processed in an electrorefining tank to obtain denitrified oil, which is then filtered once to obtain the finished denitrified oil product. However, the filtered finished denitrified oil product still contains a small amount of unreacted denitrifying agent and unfiltered nitrogen residue, which is a product formed by the complexation of the denitrifying agent and alkaline nitrogen compounds.

[0003] The presence of unreacted denitrifying agents in denitrified oil affects the quality of the finished product, and the presence of nitrogen compounds in nitrogen residue has a significant impact on the use of hydrotreated distillate oil. For example, the combustion of fuels containing organic nitrogen compounds emits nitrogen dioxide, polluting the environment; and as feedstock for hydrocracking processes, nitrogen-containing compounds can poison and deactivate the catalyst. Therefore, it is necessary to address the problem of poor filtration efficiency in denitrified oil, leading to poor quality of the finished product. Utility Model Content

[0004] In view of this, the present invention provides a system for removing alkaline nitrogen compounds from oil products to solve the problem of poor filtration effect during denitrification of hydrotreated distillate oil.

[0005] This utility model provides a system for removing alkaline nitrogen compounds from oil products, which is suitable for removing alkaline nitrogen compounds from hydrotreated distillate oils, including: a mixer, an electro-refining tank, a first filter, and a second filter connected in sequence to form a denitrification path;

[0006] The mixer is connected to an oil storage tank and a denitrifying agent tank at its feed end, and the mixer is suitable for mixing denitrifying agent and oil.

[0007] The denitrification oil discharge end of the electrorefining tank is connected to the first filter. The first filter is adapted to filter nitrogen residue in the denitrification oil, and the second filter is adapted to filter denitrifying agent and nitrogen residue in the denitrification oil.

[0008] Beneficial effects: After the oil is discharged from the electrorefining tank, it passes through the first filter and the second filter in sequence. The first filter filters out the nitrogen slag with larger particle size in the denitrified oil, achieving the initial filtration of the denitrified oil. The denitrified oil that has been initially filtered is then sent to the second filter, which filters out the denitrifying agent that has not been fully reacted and the nitrogen slag that was not filtered out by the first filter, thereby improving the filtration effect of the denitrified oil and thus improving the quality of the finished denitrified oil product.

[0009] Optionally, the first filter is provided with a packing filter layer, and the second filter is provided with an adsorbent filter layer.

[0010] Beneficial effects: The packing filter layer can filter nitrogen residue, and the adsorbent layer can adsorb denitrifying agent and nitrogen residue. By filtering the denitrified oil through the packing filter layer and adsorbing the denitrifying agent and nitrogen residue in the denitrified oil through the adsorbent layer, different impurities in the denitrified oil are removed, thereby improving the quality of the denitrified oil product.

[0011] Optionally, the filtration accuracy of the packing filter layer is 40 to 80 mesh.

[0012] Beneficial effects: Using a 40-80 mesh filter bed can effectively remove nitrogen residue contained in denitrification oil.

[0013] Optionally, the mixer is provided with a heater;

[0014] And / or, a heater is provided on the pipeline connecting the oil storage tank and the mixer;

[0015] The heater is adapted to heat the oil to a preset temperature of 50°C to 80°C.

[0016] Beneficial effects: Preheating the oil entering the mixer to a preset temperature facilitates the subsequent mixing and reaction of the oil and denitrifying agent, thus increasing the reaction rate. Simultaneously, the lower preset oil temperature reduces overall system energy consumption.

[0017] Optionally, the heater is either a steam heater or an electric heater.

[0018] Beneficial effects: Both steam heaters and electric heaters have the advantages of simple structure and simple heating method, thereby reducing the system operating cost.

[0019] Optionally, the electrorefining tank is provided with a pressure control unit, which is adapted to control the pressure inside the electrorefining tank to P, wherein P≤1MPa.

[0020] Beneficial effects: Applying rated pressure to the electro-refining tank using a pressure control unit facilitates normal operation of the electro-refining tank and improves the separation efficiency of denitrified oil and nitrogen residue.

[0021] Optionally, a nitrogen slag tank is connected to the slag discharge end of the electrorefining tank and the slag discharge end of the first filter.

[0022] Beneficial effects: The nitrogen slag tank is used to collect nitrogen slag in the electro-refining tank and the first filter, preventing nitrogen slag from accumulating in the electro-refining tank and the first filter, so that the electro-refining tank and the first filter can be maintained in the best working condition and the system efficiency can be improved.

[0023] Optionally, the top of the electrorefining tank is provided with an oil drain port, which is connected to the first filter;

[0024] And / or, the bottom of the electrorefining tank is provided with a slag discharge port, which is connected to the nitrogen slag tank.

[0025] Beneficial effects: The electro-refining tank is equipped with an oil drain port and a slag drain port at the top and bottom, respectively. After the mixture in the mixer enters the electro-refining tank, it flows from bottom to top. The mixture separates into denitrified oil and nitrogen slag. The nitrogen slag falls and accumulates at the bottom of the electro-refining tank under gravity, while the denitrified oil leaves the electro-refining tank through the oil drain port. This design facilitates the separation of denitrified oil and nitrogen slag, improving the filtration effect.

[0026] Optionally, a buffer tank is provided between the first filter and the second filter.

[0027] Beneficial effects: The buffer tank is used to store the denitrification oil discharged from the first filter and to controllably feed denitrification oil into the second filter for secondary filtration. The buffer tank controls the amount of denitrification oil entering the second filter, so that the second filter can be kept in the best working condition, thereby improving the filtration efficiency. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of a system for removing alkaline nitrogen compounds from oil products according to an embodiment of the present invention;

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Oil storage tank; 2. Mixer; 3. Electro-refining tank; 4. First filter; 5. Second filter; 6. Denitrifying agent tank; 7. Heater; 8. Nitrogen slag tank; 9. Buffer tank; 10. Injection pump; 11. Valve; 12. Nitrogen slag pump; 13. Feed pump. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] Please refer to Figure 1 This utility model provides a system for removing alkaline nitrogen compounds from oil products, suitable for removing alkaline nitrogen compounds from hydrotreated distillate oils. The system includes: a mixer 2, an electro-refining tank 3, a first filter 4, and a second filter 5 connected in sequence to form a denitrification path; wherein, the feed end of the mixer 2 is connected to an oil storage tank 1 and a denitrifying agent tank 6, and the mixer 2 is suitable for mixing the denitrifying agent with the oil product; the discharge end of the electro-refining tank 3 is connected to the first filter 4, the first filter 4 is suitable for filtering nitrogen residue in the denitrified oil, and the second filter 5 is suitable for filtering the denitrifying agent and nitrogen residue in the denitrified oil.

[0034] In this embodiment, the oil storage tank 1 is used to store the hydrotreated distillate oil to be processed, and the denitrifying agent tank 6 is used to store the denitrifying agent. The hydrotreated distillate oil and the denitrifying agent are fully mixed and reacted in the mixer 2 to generate a complex. Then, the mixture in the mixer 2 is sent to the electrorefining tank 3.

[0035] The electrorefining tank 3 is equipped with an electric field. When the oil containing nitrogen residue passes through the electric field, a dipole is generated. Under the action of the electric field force, it moves towards the positive and negative plates. Adjacent nitrogen residues also attract each other and collide and aggregate. After passing through the electric field, the nitrogen residues are removed and settle to the bottom of the electrorefining tank 3. The denitrified oil located at the top of the electrorefining tank 3 is sent to the first filter 4 for preliminary filtration to remove the nitrogen residues contained in the denitrified oil. Then, the preliminarily filtered denitrified oil is sent to the second filter 5. The second filter 5 is used to further remove the unreacted denitrifying agent and the nitrogen residues that were not filtered by the first filter 4, thereby obtaining the denitrified oil product. Through two filtrations, the quality of the denitrified oil product is improved.

[0036] In this embodiment, the mixer 2 is designed with a high-efficiency stirring device or vortex generator to ensure that the hydrotreated distillate oil and the denitrifying agent can fully contact and mix, thereby improving the reaction rate and efficiency.

[0037] In this embodiment, the denitrifying agent is selected from existing types based on actual needs. The denitrifying agent is a highly active chemical substance. Inside the mixer 2, the Lewis base properties of basic nitrogen compounds (such as hydroxypyridine and hydroxyquinoline) are utilized to react with the denitrifying agent containing transition metal ions, generating high-density complex nitrogen slag. The formation of these complexes facilitates the separation of nitrogen compounds from the oil, thereby achieving the purpose of denitrification.

[0038] In this embodiment, according to actual needs, the mixer 2 is equipped with appropriate reaction temperature and reaction pressure. Appropriate reaction temperature can improve reaction rate and complex formation efficiency, and appropriate pressure can ensure sufficient contact between denitrification agent and hydrotreated distillate oil.

[0039] Furthermore, an injection pump 10 is installed on the pipeline connecting the denitrifying agent tank 6 and the mixer 2. The injection pump 10 is used to provide power to send the denitrifying agent in the denitrifying agent tank 6 into the mixer 2.

[0040] Optionally, the first filter 4 is provided with a packing filter layer, and the second filter 5 is provided with an adsorbent filter layer.

[0041] In this embodiment, the packing filter layer in the first filter 4 is used to filter nitrogen slag with larger particle size, and the second filter 5 is used to adsorb unreacted denitrifying agent and nitrogen slag that was not filtered out by the first filter 4 in the denitrification oil. In this way, the denitrification oil discharged from the electrorefining tank 3 is effectively separated from nitrogen slag and denitrifying agent after secondary filtration, thereby improving the quality of the denitrification oil product.

[0042] In one specific embodiment, the filter media is one of the following: filter screen, quartz sand filter media, or ceramsite filter media. Alternatively, it can be a multi-layer combination of the above materials to improve the filtration effect of the first filter 4.

[0043] In one specific embodiment, the adsorbent filter layer is one or more combinations of activated carbon or zeolite, etc. Activated carbon and zeolite have well-developed pore structures and huge specific surface areas, which enables them to effectively adsorb nitrogen slag and unreacted denitrifying agents.

[0044] Furthermore, the filtration precision of the packed filter layer is 40-80 mesh. This effectively filters nitrogen slag from the denitrified oil, ensuring the quality of nitrogen slag removal while preventing clogging of the second filter 5. As a pretreatment step, the packed filter layer effectively removes most of the nitrogen slag, reducing the burden on the adsorbent filter layer and extending its regeneration frequency and working cycle. The use of the packed filter layer significantly reduces adsorbent consumption, thereby lowering production costs.

[0045] Preferably, the filtration precision of the packing filter layer is 60 mesh.

[0046] Optionally, a heater 7 is provided on the mixer 2; and / or a heater 7 is provided on the pipeline connecting the oil storage tank 1 and the mixer 2; wherein the heater 7 is adapted to heat the oil to a preset temperature of 50°C to 80°C.

[0047] In this embodiment, the oil needs to be heated to a preset temperature before mixing with the denitrifying agent. Therefore, a heater 7 is installed on the pipeline connecting the mixer 2 and / or the oil storage tank 1 to the mixer 2. The heater 7 is used to heat the oil and improve the mixing efficiency of the mixer 2.

[0048] Preferably, the heater 7 heats the oil to between 50°C and 80°C. The preset temperature of the oil is relatively low, which can reduce the energy consumption of the heater 7 and thus reduce the energy consumption of the entire system.

[0049] In one specific embodiment, the heater 7 is either a steam heater or an electric heater. Both steam heaters and electric heaters offer advantages such as simple structure and ease of use. Furthermore, due to the simple heating method and the relatively low preset temperature of the oil, the energy consumption of the heater 7 is relatively low, thereby reducing the overall energy consumption of the denitrification system.

[0050] Optionally, the electropolishing tank 3 is equipped with a pressure control unit, which is adapted to control the pressure inside the electropolishing tank 3 to P, wherein P≤1MPa.

[0051] In this embodiment, the pressure control unit is used to control the working pressure inside the electrorefining tank 3, so that the electrorefining tank 3 can effectively separate nitrogen slag and denitrification oil.

[0052] In one specific embodiment, the pressure control unit includes a pressure sensor installed inside the electro-refining tank 3, as well as an air inlet pipe and an air outlet pipe connected to the electro-refining tank 3. In the initial stage of operation of the electro-refining tank 3, the air inlet pipe is opened and the air outlet pipe is closed, and gas is injected into the electro-refining tank 3 through the air inlet pipe to slowly increase the pressure inside the electro-refining tank 3.

[0053] Optionally, a nitrogen slag tank 8 is connected to the slag discharge end of the electrorefining tank 3 and the slag discharge end of the first filter 4.

[0054] In this embodiment, both the electrorefining tank 3 and the first filter 4 are provided with slag discharge ends. The slag discharge ends are used to discharge nitrogen slag so that the nitrogen slag can be sent into the nitrogen slag tank 8 for collection.

[0055] Preferably, the slag discharge end of the electrorefining tank 3 is located at the bottom of the electrorefining tank 3. The nitrogen slag inside the electrorefining tank 3 falls to the bottom of the electrorefining tank 3 under the action of gravity and accumulates, which facilitates the collection of nitrogen slag inside the electrorefining tank 3.

[0056] Preferably, the slag discharge end of the first filter 4 is located at the bottom of the first filter 4, the packing filter layer inside the first filter 4 is located in the middle of the tank of the first filter 4, and the connection between the oil discharge end of the electrorefining tank 3 and the first filter 4 is located below the packing filter layer. In this way, the denitrification oil in the first filter 4 moves from top to bottom. After entering the first filter 4, the denitrification oil moves upward. After being filtered by the packing filter layer, the denitrification oil that passes through the packing filter layer continues to move upward and enters the second filter 5, while the nitrogen slag is blocked by the packing filter layer. Some of the nitrogen slag adheres to the bottom of the packing filter layer, and the remaining nitrogen slag falls to the bottom of the first filter 4 and accumulates under the action of gravity.

[0057] Furthermore, valves 11 are respectively installed on the pipeline connecting the electrorefining tank 3 and the nitrogen slag tank 8, and on the pipeline connecting the first filter 4 and the nitrogen slag tank 8. Valves 11 are used to control the pipeline connection. Valves 11 can be automatic valves and / or manual valves. By controlling the valves 11 to open at regular intervals, the nitrogen slag in the electrorefining tank 3 and the first filter 4 is sent into the nitrogen slag tank 8 for storage.

[0058] Furthermore, the discharge end of the nitrogen slag tank 8 is connected to a discharge pipeline, and a nitrogen slag pump 12 is installed on the discharge pipeline. The nitrogen slag in the nitrogen slag tank 8 is discharged and loaded onto a vehicle by the nitrogen slag pump 12, which facilitates the subsequent processing of the nitrogen slag.

[0059] Optionally, the top of the electrorefining tank 3 is provided with an oil drain port, which is connected to the first filter 4; and / or, the bottom of the electrorefining tank 3 is provided with a slag discharge port, which is connected to the nitrogen slag tank 8.

[0060] Preferably, the top of the electrorefining tank 3 is provided with an oil drain port, and the bottom of the electrorefining tank 3 is provided with a slag drain port. The oil drain port is used to discharge the denitrified oil obtained after processing in the electrorefining tank 3, and the slag drain port and the nitrogen slag tank 8 are connected by a pipeline to discharge the nitrogen slag at the bottom of the electrorefining tank 3.

[0061] Under the above configuration, after the mixture in the mixer 2 enters the electro-refining tank 3, the mixture can flow from bottom to top in the electro-refining tank 3, so that the nitrogen residue and denitrification oil are effectively separated.

[0062] Of course, in addition to the above-mentioned arrangement, another specific implementation can be adopted, in which the slag discharge port is located at the bottom of the electrorefining tank 3 and the oil discharge port is located in the middle of the electrorefining tank 3. Alternatively, the slag discharge port can be located near the bottom of the electrorefining tank 3 and the oil discharge port can be located at the top of the electrorefining tank 3.

[0063] Optionally, a buffer tank 9 is provided between the first filter 4 and the second filter 5.

[0064] In this embodiment, the buffer tank 9 is used to store the denitrified oil discharged from the first filter 4. During the secondary filtration of the denitrified oil, the denitrified oil filtered by the first filter 4 is sent into the buffer tank 9 for storage due to the limited filtration efficiency of the second filter 5.

[0065] Furthermore, when there is a large amount of denitrification oil in the buffer tank 9, the feeding of denitrification oil into the first filter 4 can be stopped, and the first filter 4 will stop working. The valve 11 on the connecting pipeline between the first filter 4 and the nitrogen sludge tank 8 can be opened, allowing the nitrogen sludge in the first filter 4 to fall from the bottom of the packing filter layer, cleaning the packing filter layer and extending its service life. During the cleaning process of the packing filter layer in the first filter 4, the second filter 5 can still operate normally, thus maintaining the system's processing efficiency.

[0066] Furthermore, a feed pump 13 is installed on the pipeline connecting the buffer tank 9 and the second filter 5. The feed pump 13 is used to control the amount of denitrified oil entering the second filter 5, so that the second filter 5 is kept in the optimal filtration state.

[0067] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A system for removing alkaline nitrogen compounds from oil products, characterized in that, Suitable for removing alkaline nitrogen compounds from hydrotreated distillate oil, comprising: a mixer (2), an electro-refining tank (3), a first filter (4), and a second filter (5) connected in sequence to form a denitrification path; The mixer (2) is connected to an oil storage tank (1) and a denitrifying agent tank (6) at its feed end. The mixer (2) is suitable for mixing denitrifying agent and oil. The denitrification oil discharge end of the electrorefining tank (3) is connected to the first filter (4). The first filter (4) is suitable for filtering nitrogen residue in the denitrification oil, and the second filter (5) is suitable for filtering denitrifying agent and nitrogen residue in the denitrification oil.

2. The system for removing alkaline nitrogen compounds from oil products according to claim 1, characterized in that, The first filter (4) is provided with a packing filter layer, and the second filter (5) is provided with an adsorbent filter layer.

3. The system for removing alkaline nitrogen compounds from oil products according to claim 2, characterized in that, The filtration accuracy of the packing filter layer is 40-80 mesh.

4. The system for removing alkaline nitrogen compounds from oil products according to claim 1, characterized in that, The mixer (2) is equipped with a heater (7); And / or, a heater (7) is provided on the pipeline connecting the oil storage tank (1) and the mixer (2); The heater (7) is adapted to heat the oil to a preset temperature of 50°C to 80°C.

5. The system for removing alkaline nitrogen compounds from oil products according to claim 4, characterized in that, The heater (7) is either a steam heater or an electric heater.

6. The system for removing alkaline nitrogen compounds from oil products according to claim 1, characterized in that, The electro-refining tank (3) is equipped with a pressure control unit, which is adapted to control the pressure inside the electro-refining tank (3) to P, wherein P≤1MPa.

7. The system for removing alkaline nitrogen compounds from oil products according to any one of claims 1-6, characterized in that, The slag discharge end of the electro-refining tank (3) and the slag discharge end of the first filter (4) are connected to a nitrogen slag tank (8).

8. The system for removing alkaline nitrogen compounds from oil products according to claim 7, characterized in that, The top of the electro-refining tank (3) is provided with an oil drain port, which is connected to the first filter (4); And / or, the bottom of the electrorefining tank (3) is provided with a slag discharge port, which is connected to the nitrogen slag tank (8).

9. The system for removing alkaline nitrogen compounds from oil products according to any one of claims 1-6, characterized in that, A buffer tank (9) is provided between the first filter (4) and the second filter (5).

Images