Oil-gas mixing equipment of oil refining hydrogenation device

Abstract

The invention discloses oil-gas mixing equipment of an oil refining hydrogenation device, which is characterized in that a vertical oil inlet pipe is fixedly inserted in the middle of a baffle plate, the upper side wall of the baffle plate is fixedly connected with a vertical gas conveying pipe wrapping the oil inlet pipe, a distance exists between the gas conveying pipe and the oil inlet pipe, a fixing ring is arranged on the upper side of the gas conveying pipe, and fixing plates are symmetrically arranged on the fixing ring; a first wedge-shaped block and a second wedge-shaped block are arranged on the lower sides of the two fixing plates respectively, limiting grooves matched with the positioning block are formed in the outer wall of the first wedge-shaped block and the outer wall of the second wedge-shaped block, the first wedge-shaped block and the second wedge-shaped block are arranged on the positioning block in a sliding and sleeving mode through the limiting grooves respectively, and the first wedge-shaped block and the second wedge-shaped block are located on the outer side of the upper end of the oil inlet pipe respectively. According to the oil-gas mixing equipment of the oil refining hydrogenation device, heavy oil splashed from the oil inlet pipe is atomized into small liquid drops, the atomized heavy oil and hydrogen are fully contacted and reacted in the reaction tank, and the removal efficiency of impurities in the heavy oil is improved.

Description

Technical Field

[0001] This invention relates to the field of oil refining technology, and more particularly to an oil-gas mixing device for an oil refining hydrogenation unit. Background Technology

[0002] Hydrogenation technology is widely used in heavy oil processing to remove impurities and lighten the oil. However, due to the high viscosity of heavy oil, it still forms large droplets during the reaction with hydrogen, while hydrogen remains in a gaseous state. Even with thorough stirring, the fluid-like heavy oil and hydrogen cannot fully contact each other in a short time, thus requiring a long reaction time and resulting in low conversion efficiency of heavy oil.

[0003] Chinese patent CN109705916A discloses a method for processing residual oil feedstock, comprising: introducing a first material containing residual oil feedstock into a fixed-bed hydrotreating device that sequentially contains a protective reaction zone, a hydrodemetallization reaction zone, and a desulfurization and decarbonization reaction zone connected in series for hydrotreating; after the fixed-bed hydrotreating device has been running for a period of time, cutting off either reactor A or reactor B, and introducing a second material containing hydrogen and cleaning oil into the cut-off reactor for hydrotreating and cleaning treatment. Although this patented technology can eliminate carbon deposits on the catalyst of the desulfurization and decarbonization reactor online and extend the operating cycle, it lacks a mixing device for heavy oil and hydrogen, especially for residual oil, which has high viscosity and uneven mixing with hydrogen, resulting in a slow catalytic reaction rate and accelerated catalyst carbon deposition.

[0004] Chinese patent CN106895243A discloses a lubrication system for hot roller bearings in textile machinery, including an oil supply device, an air supply device, an oil-air mixing device, an oil-air separation device, several hot roller bearings, and a conveying pipeline. The air supply device and the oil supply device are respectively connected to the oil-air mixing device via the conveying pipeline. The oil-air mixing device is connected to the inlet of the hot roller bearing via the conveying pipeline. The outlet of the hot roller bearing is connected to the inlet of the oil-air separation device via the conveying pipeline. The first outlet of the oil-air separation device is connected to the oil supply device via the conveying pipeline, and the second outlet of the oil-air separation device is connected to the outside air via the conveying pipeline. The oil-air separation device separates the lubricating oil from the compressed air; the compressed air is discharged from the system, and the lubricating oil can be recycled. Furthermore, compressed air is a natural coolant; the overflow of compressed air carries away a large amount of heat, allowing the hot roller bearings to maintain low-temperature operation.

[0005] Chinese patent CN106701174A discloses a liquid-phase hydrogenation device and method, which uses an upward reactor and a downward reactor connected in series. Each of the upward and downward reactors has n catalyst beds and 2n-2 hydrogen replenishment points, making it suitable for reactions involving feedstocks with high hydrogen consumption. At least one microporous hydrogen dissolving distributor is installed between each catalyst bed to disperse hydrogen into microbubbles, enabling multi-point quantitative hydrogen replenishment. This method uniformly and effectively increases the gas-liquid contact surface, promotes the reaction, and improves hydrogenation efficiency. Simultaneously, the spacing between catalyst beds is reduced by more than 50%, thereby increasing reactor utilization efficiency.

[0006] Chinese patent CN206724161U discloses an oil-gas mixing nozzle. The inlet end of the housing is open, and the outlet end of the housing is a closed frustum shape. At least eight oil-gas mixing outlets are evenly distributed on the circumference of the frustum at the outlet end of the housing. An atomizing plate is arranged inside the housing near the inlet end, and an oil-gas mixing chamber is formed between the atomizing plate and the outlet end. An oil pipe is arranged at the center of the atomizing plate, and an oil inlet is inside the oil pipe. At least five air inlets are evenly distributed on the atomizing plate. An annular boss is arranged on the outer periphery of the oil pipe facing the inlet end. The extension of the axis of the at least five air inlets forms a first cone, and the extension of the axis of the at least eight oil-gas mixing outlets forms a second cone. This mixing nozzle can mix oil and gas in the housing to a certain extent. However, since the oil-gas mixing outlet is located on the side of the second cone after mixing, it cannot be guaranteed that the mixed oil and gas can be smoothly discharged from the mixing nozzle. Some oil and gas may be retained in the second cone, and the effect of sufficient contact and smooth discharge of oil and gas from the mixing nozzle cannot be achieved. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides an oil-gas mixing device for an oil refining hydrogenation unit, which solves the problems of insufficient oil-gas contact and long reaction time in the prior art.

[0008] To achieve the above objectives, the present invention provides an oil-gas mixing device for an oil refining hydrotreating unit. The oil-gas mixing device includes: a baffle plate; a vertical oil inlet pipe fixedly inserted in the middle of the baffle plate; a vertical gas delivery pipe fixedly connected to the upper side wall of the baffle plate, enclosing the oil inlet pipe; a gap between the gas delivery pipe and the oil inlet pipe; two guide holes symmetrically formed on the lower side wall of the baffle plate between the oil inlet pipe and the gas delivery pipe; a connecting pipe fixedly provided on the lower side wall of the baffle plate, connecting the two guide holes; an air inlet pipe fixedly inserted into the outer wall of the connecting pipe; and the upper end of the gas delivery pipe being higher than the upper end of the oil inlet pipe. Two vertical positioning blocks are symmetrically fixed to the inner wall of the upper end of the gas pipeline. A fixing ring is provided on the upper side of the gas pipeline, and fixing plates are symmetrically provided on the fixing ring. Wedge block one and wedge block two are respectively provided on the lower side of the two fixing plates. The outer walls of wedge block one and wedge block two are provided with limiting grooves that are adapted to the positioning blocks. Wedge block one and wedge block two are slidably sleeved on the positioning blocks through the limiting grooves. Wedge block one and wedge block two are respectively located on the outer side of the upper end of the oil inlet pipe. A pressure cap located on the outer side of the fixing ring is sleeved on the upper end of the gas pipeline. A through hole is provided in the middle of the pressure cap.

[0009] Preferably, the upper outer wall of the gas pipeline is provided with external threads, the inner wall of the gland is provided with internal threads, and the two positioning blocks correspond to the two guide holes respectively.

[0010] Preferably, a top ring is fixedly provided on the upper side wall of the fixing ring, and the top ring is elastic.

[0011] Preferably, the outer wall of the baffle is fixedly connected with a plurality of connecting plates, and the plurality of connecting plates are distributed at equal intervals around the baffle.

[0012] Preferably, the upper end of the oil inlet pipe is fixedly connected to a cap located between wedge block one and wedge block two, and the cap is tapered from bottom to top.

[0013] Preferably, a sealing ring is provided between the inner top wall of the gland and the upper end of the gas pipeline, which is sleeved on the outside of the fixing ring.

[0014] Preferably, each of the two positioning blocks is provided with a threaded hole II penetrating the outer wall of the gas transmission pipe, and the outer wall of the pressure cap is provided with two through holes II corresponding to the threaded holes II.

[0015] The gas delivery pipe and oil inlet pipe of this invention are used to transport hydrogen and heavy oil, respectively. The hydrogen and heavy oil enter the reaction tank through the gas delivery pipe and oil inlet pipe to participate in the hydrogenation reaction of the heavy oil. Since wedge block one and wedge block two reduce the diameter of the gas delivery pipe, the pressure increases instantaneously when the hydrogen flows through wedge block one and wedge block two, atomizing the heavy oil splashed from the oil inlet pipe into small droplets. The atomized heavy oil and hydrogen fully contact and react in the reaction tank, improving the removal efficiency of impurities in the heavy oil. Attached Figure Description

[0016] Figure 1 This is an exploded view of the oil-gas mixing equipment of a hydrotreating unit for oil refining according to Embodiment 1 of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of the fixing ring of the oil-gas mixing device in a hydrotreating unit for oil refining according to Embodiment 1 of the present invention;

[0018] Figure 3 This is a schematic diagram of the external appearance of the oil-gas mixing equipment of the oil refining hydrotreating unit according to Embodiment 1 of the present invention;

[0019] Figure 4 This is a schematic diagram of the external appearance of the oil-gas mixing equipment of the oil refining hydrotreating unit according to Embodiment 1 of the present invention;

[0020] Figure 5 This is an exploded view of the structure of the oil-gas mixing equipment in the oil refining hydrotreating unit according to Embodiment 2 of the present invention;

[0021] Figure 6 This is a schematic diagram of the structure of the fixed ring of the oil-gas mixing device in the oil refining hydrogenation unit of Embodiment 2 of the present invention.

[0022] In the diagram: 1. Baffle, 2. Oil inlet pipe, 3. Air supply pipe, 4. Guide hole, 5. Connecting pipe, 6. Air inlet pipe, 7. Positioning block, 8. Fixing ring, 9. Wedge block one, 10. Wedge block two, 11. Limiting groove, 12. Pressure cap, 13. Through hole one, 14. Top ring, 15. Connecting plate, 16. Cap, 17. Sealing ring. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] Example 1

[0025] Reference Figures 1 to 4 The oil-gas mixing device of the refining hydrogenation unit in this embodiment includes a baffle 1, which is circular in shape. A vertical oil inlet pipe 2 is fixedly inserted in the middle of the baffle 1. The oil inlet pipe 2 is used to transport heavy oil into the reaction tank to saturate olefins. A vertical gas delivery pipe 3 is fixedly connected to the upper side wall of the baffle 1, which wraps around the oil inlet pipe 2. There is a certain distance between the gas delivery pipe 3 and the oil inlet pipe 2. The gas delivery pipe 3 is used to transport hydrogen into the reaction tank. Under the action of high pressure, high temperature and catalyst, the heavy oil reacts with hydrogen, and impurities such as sulfur and chlorine in the heavy oil feedstock are removed by hydrogenation, providing high-purity heavy oil for the subsequent cracking process.

[0026] Two guide holes 4 are symmetrically opened on the lower side wall of the baffle 1, located between the oil inlet pipe 2 and the gas delivery pipe 3. A connecting pipe 5 is fixedly installed on the lower side wall of the baffle 1, connecting the two guide holes 4. An air inlet pipe 6 is fixedly inserted into the outer wall of the connecting pipe 5. Hydrogen gas is delivered into the connecting pipe 5 through the air inlet pipe 6, and then discharged into the gas delivery pipe 3 through the two guide holes 4. The upper end of the gas delivery pipe 3 is slightly higher than the upper end of the oil inlet pipe 2. Two vertical positioning blocks 7 are symmetrically fixed on the inner wall of the upper end of the gas delivery pipe 3. The two positioning blocks 7 correspond to the two guide holes 4 respectively. A fixing ring 8 is set on the upper side of the gas delivery pipe 3. Fixing plates are symmetrically set on the fixing ring 8. Wedge block 1 9 and wedge block 2 10 are respectively set on the lower side of the two fixing plates. The inclined surfaces on wedge block 1 9 and wedge block 2 10 are symmetrical to each other, and the distance between the corresponding points of the two inclined surfaces is set from bottom to top and from far to near. The outer walls of wedge block 1 9 and wedge block 2 10 are arc-shaped and are aligned with the upper end of the gas delivery pipe 3. The inner walls are matched, and the outer walls of wedge block 19 and wedge block 20 are each provided with a limiting groove 11 that matches the positioning block 7. The limiting groove 11 penetrates the lower side wall of the corresponding wedge block 19 and wedge block 20. Wedge block 19 and wedge block 20 are slidably sleeved on the positioning block 7 through the limiting groove 11, and wedge block 19 and wedge block 20 are located on the outer side of the upper end of the oil inlet pipe 2. The upper end of the oil inlet pipe 2 is fixedly connected to the wedge block 19 and wedge block 20. The cap 16 between 10 has a tapering design from bottom to top. When heavy oil is sprayed out through the cap 16, the oil column is relatively thin. The wedge block 19 and wedge block 20 have the effect of reducing the diameter of the gas pipeline 3, so that the pressure of the hydrogen gas flow through the wedge block 19 and wedge block 20 increases instantaneously, atomizing the heavy oil sprayed from the cap 16 into small droplets. After the hydrogen gas and the atomized heavy oil enter the reaction tank, they will come into full contact, which is beneficial to improving the rate of heavy oil hydrogenation reaction.

[0027] The upper outer wall of the gas pipe 3 is provided with external threads. The upper end of the gas pipe 3 is fitted with a pressure cap 12 located outside the fixing ring 8. A through hole 13 is opened in the middle of the pressure cap 12. The inner wall of the pressure cap 12 is provided with an internal thread that matches the external thread on the gas pipe 3. A top ring 14 is fixedly provided on the upper side wall of the fixing ring 8. The top ring 14 is elastic. After the pressure cap 12 is tightened and fixed to the gas pipe 3, the inner top wall of the pressure cap 12 will squeeze the top ring 14, so that the top ring 14 squeezes the fixing ring 8, and fixes the first wedge block 9 and the second wedge block 10 on the corresponding positioning block 7 respectively.

[0028] Multiple connecting plates 15 are fixedly connected to the outer wall of the baffle 1. The multiple connecting plates 15 are distributed at equal intervals around the baffle 1. A threaded hole is opened on the connecting plate 15. The connecting plate 15 can be fastened to the outer wall of the reaction vessel by a bolt, thereby fixing the gas supply pipe 3 inside the reaction vessel. A sealing ring 17 is provided between the inner top wall of the pressure cap 12 and the upper end of the gas supply pipe 3, which is sleeved on the outside of the fixing ring 8. The sealing ring 17 seals the pressure cap 12 and the gas supply pipe 3, improving the airtightness of the end of the gas supply pipe 3.

[0029] Example 2

[0030] Reference Figures 5 to 6 The oil-gas mixing equipment of the refining hydrogenation unit in this embodiment differs from that in Embodiment 1 in that: both positioning blocks 7 are provided with threaded holes 2 penetrating the outer wall of the gas transmission pipe 3, and the outer wall of the pressure cap 12 is provided with two through holes 2 corresponding to the threaded holes 2. The pressure cap 12 is put on the gas transmission pipe 3 and pressed down to align the through holes 2 with the threaded holes 2. Then, the bolt 2 is inserted so that the threaded end of the bolt 2 extends into the threaded hole 2 and is tightened and engaged with the threaded hole 2. At this time, the pressure cap 12 will be fixed, and the wedge block 1 9 and the wedge block 2 10 are fixed on the corresponding positioning blocks 7 under the limiting action of the fixing ring 8.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An oil-gas mixing device for an oil refining hydrotreating unit, characterized in that, include: A baffle is provided, with a vertical oil inlet pipe fixedly inserted in the middle. A vertical air supply pipe, enclosing the oil inlet pipe, is fixedly connected to the upper side wall of the baffle. There is a gap between the air supply pipe and the oil inlet pipe. Two guide holes are symmetrically opened on the lower side wall of the baffle, located between the oil inlet pipe and the air supply pipe. A connecting pipe is fixedly provided on the lower side wall of the baffle, connecting the two guide holes. An air inlet pipe is fixedly inserted into the outer wall of the connecting pipe. The upper end of the air supply pipe is higher than the upper end of the oil inlet pipe. Two vertical fixed... The gas pipeline has a fixed ring on its upper side, and fixed plates are symmetrically arranged on the fixed ring. Wedge block one and wedge block two are respectively arranged on the lower side of the two fixed plates. The outer walls of wedge block one and wedge block two are provided with limiting grooves that are adapted to the positioning block. Wedge block one and wedge block two are slidably sleeved on the positioning block through the limiting grooves. Wedge block one and wedge block two are respectively located on the outer side of the upper end of the oil inlet pipe. The upper end of the gas pipeline is sleeved with a pressure cap located on the outer side of the fixed ring. A through hole is provided in the middle of the pressure cap.

2. The oil-gas mixing equipment of the oil refining hydrotreating unit according to claim 1, characterized in that, The upper outer wall of the gas pipeline is provided with external threads, the inner wall of the gland is provided with internal threads, and the two positioning blocks correspond to the two guide holes respectively.

3. The oil-gas mixing equipment of the oil refining hydrotreating unit according to claim 1, characterized in that, A top ring is fixedly provided on the upper side wall of the fixed ring, and the top ring is elastic.

4. The oil-gas mixing equipment of the oil refining hydrotreating unit according to claim 1, characterized in that, The outer wall of the baffle is fixedly connected to multiple connecting plates, which are distributed at equal intervals around the baffle.

5. The oil-gas mixing equipment of the oil refining hydrotreating unit according to claim 1, characterized in that, The upper end of the oil inlet pipe is fixedly connected to a cap located between wedge block one and wedge block two, and the cap is designed to taper from bottom to top.

6. The oil-gas mixing equipment of the oil refining hydrotreating unit according to claim 1, characterized in that, A sealing ring is provided between the inner top wall of the gland and the upper end of the gas pipeline, which is sleeved on the outside of the fixing ring.

7. The oil-gas mixing equipment of the oil refining hydrotreating unit according to claim 1, characterized in that, Both positioning blocks are provided with threaded holes that penetrate the outer wall of the gas pipeline, and the outer wall of the pressure cap is provided with two through holes that correspond to the threaded holes.

Images