Mixing system for ethylene with oxygen

Abstract

The application discloses a mixing system for mixing ethylene and oxygen, which comprises a cylinder, a first gas inlet, a second gas inlet, a partition plate, a gas inlet partition plate, a first gas feeding area, a second gas feeding area, a jet ring, a distribution area and a dispersion cylinder; the distribution area is divided into a plurality of annular channels; the left end of the jet ring is provided with a U-shaped notch opening to the left, and the notch cuts through the area to form a notch area; each annular channel through which the notch passes from the next outer annular channel has a U-shaped notch opening to the left; from the outside to the inside, the annular channels with notches are alternately and intervalled closed in the circumferential direction of the notch by baffles to form notch closed annular channels and notch unclosed annular channels, and the next outer layer is the first notch closed annular channel; the second gas feeding area, the second gas channel hole, the notch area and the notch unclosed annular channel are sequentially communicated; and the first gas feeding area is communicated with the notch closed annular channel through the first gas channel hole. The application can realize the uniform mixing of ethylene and oxygen.

Description

Technical Field

[0001] This invention belongs to the field of mixing technology, and specifically relates to a mixing system for mixing ethylene and oxygen. Background Technology

[0002] Ethylene oxide (EO) is a major chemical product in the downstream derivatives of the ethylene industry, second only to polyethylene. It has a wide range of applications, primarily in the production of nonionic surfactants, ethanol adhesives, ethylene glycol esters, and fine chemicals such as pharmaceuticals. It can also be used as a disinfectant and sterilizing agent in food, cosmetics, surgical equipment, and other medical devices. There are over 6,000 downstream products of ethylene oxide, indicating a promising future for its production.

[0003] There are two main industrial production technologies for ethylene oxide: the chlorohydrin process and the direct oxidation of ethylene. The chlorohydrin process was initially dominant, but it has been largely replaced by the direct oxidation of ethylene due to the use of chlorine gas and the generation of large amounts of hydrogen chloride, which causes severe corrosion and damage to equipment, buildings, and auxiliary facilities. Furthermore, the wastewater, waste gas, and waste materials are difficult to treat. The direct oxidation of ethylene can be further divided into air oxidation and oxygen oxidation, depending on the oxidant used. Air oxidation typically has lower operating costs and better catalyst selectivity, but it requires higher investment and has a lower conversion rate. Currently, the mainstream production method is oxygen oxidation, which synthesizes ethylene oxide through the reaction of ethylene with oxygen. Before the reaction, ethylene and oxygen must be mixed. However, ethylene is flammable and explosive, and its explosive range (with oxygen) is wide. Improper control can easily lead to combustion and explosion accidents, posing a high risk. Therefore, the mixing of ethylene and oxygen is a key process and equipment requirement in ethylene oxide production.

[0004] Currently, the commonly used mixing methods in industrial production mainly include agitation mixing, static mixer mixing, and jet mixing. Agitation mixing mainly uses external mechanical energy such as mechanical stirring to enhance the macroscopic mixing of fluids. However, because chemical products are often flammable, explosive, highly toxic, and easily react with heat, mechanical stirring may provide the sparks and heat required for combustion. Furthermore, sealing moving parts is difficult and prone to leakage. Therefore, agitation mixing is difficult to use for mixing ethylene and oxygen. Static mixer mixing generally involves setting baffles or other structures in the mixer or pipeline to disrupt the fluid flow, increasing the velocity gradient of laminar flow or creating turbulence to achieve mixing. However, the explosive range of ethylene and oxygen is wide, making it difficult to control the mixing ratio in a static mixer. Precise mixing of ethylene and oxygen is difficult to achieve, therefore, static mixers are also difficult to use for mixing ethylene and oxygen.

[0005] Jet mixing utilizes the entrainment effect of a high-speed jet. A rapidly moving fluid (the jet) is injected into a slowly flowing or stationary fluid (the main fluid). Due to the velocity difference between the jet and the main fluid, a mixing layer forms at the jet boundary. This mixing layer extends along the jet flow direction, entraining and mixing the main fluid into the jet, resulting in a homogeneous mixture of the two fluids. Due to its advantages such as simple structure, no rotating parts, reliable operation, vigorous mixing, and fast mass and heat transfer rates, it has become a widely used mixing method in industrial production.

[0006] Currently, the ethylene-oxygen mixers used in industry commonly employ a mixing method where the main flow is fed from the side and the jet is fed from the tube. Overall, the jet is a single-point injection, which is uneven in the circumferential direction and has a poor mixing effect. After the main flow enters the mixer from the side, the flow direction changes, resulting in uneven flow within the mixer and a large impact on the tube, making the tube prone to breakage. The structural design is unreasonable and needs continuous improvement.

[0007] Patent CN 101612547A discloses a tubular impinging flow reactor and operating system for producing toluene diisocyanate. The tubular components pass through a cylindrical body and are evenly distributed on upper and lower tube plates within the body. One stream of material is injected through jet nozzles on the lower tube plate, while another stream of fluid is injected at a certain angle into the impinging mixing zone through jet nozzles distributed on the tubular components and the tube expansion section, where it rapidly mixes with the first stream of material. Because the other stream of fluid is fed laterally and directly impacts the tubular components for an extended period, it may cause the tubular components to vibrate, become damaged, and disrupt the mixing and reaction process.

[0008] Patent CN 114904408 B discloses an ethylene and oxygen mixer. It divides the feed zone into an ethylene feed zone and an oxygen feed zone by setting a layered partition. Ethylene and oxygen channels are respectively formed on the distribution plates in the ethylene and oxygen feed zones, creating an oxygen jet into the ethylene, thus achieving jet mixing of the two media. However, overall, due to the higher velocity of the jet to the left, a longer distance is required to achieve a uniform circumferential distribution of ethylene and oxygen in the ethylene and oxygen annular channels, resulting in a long axial length and a large footprint for the equipment.

[0009] In summary, the mixing of ethylene and oxygen is a crucial production step. The mixing process involves traversing an explosive zone, making it extremely dangerous. Therefore, it is essential to ensure that ethylene and oxygen are uniformly mixed and kept away from the explosive zone. Currently, jet mixing technology suffers from technical problems such as a high risk of safety accidents and the long axial length of the mixing equipment, requiring further improvement. Summary of the Invention

[0010] To address the technical problems of feeding from different directions, easy vibration of the tube, and long mixer size in existing technologies, this invention provides a mixing system for mixing ethylene and oxygen, which enables ethylene and oxygen to quickly pass through the explosion zone during the mixing process, and after uniform mixing, move away from the explosion zone, thereby achieving long-term safety and compact equipment.

[0011] The present invention provides a mixing system for mixing ethylene and oxygen, comprising a cylinder and a first gas inlet, a second gas inlet, a dividing plate, an inlet baffle, a spray ring, and a dispersion cylinder arranged sequentially from left to right along the cylinder axis; the cylinder is cylindrical, closed at one end and open at the other end; there are multiple spray rings, each cylindrical with open ends, one end of which is fixed to the inlet baffle along the cylinder axis and coaxially arranged with the cylinder; the space between the inlet baffle and the closed end of the cylinder forms a gas feeding zone, the space inside the cylinder where the inlet baffle and the spray ring are located forms a distribution zone, and the space between the spray ring and the open end of the cylinder forms a jet mixing zone;

[0012] The intake baffle and injection ring divide the distribution area into annular channels with decreasing diameter from the outside to the inside along the radial direction of the cylinder. The left end of the injection ring, which is close to the intake baffle, cuts a notch along the axial direction of the injection ring to the right and along the radial direction of the cylinder from the outside to the inside. The notch is U-shaped with the opening to the left. The number of injection rings cut through by the notch from the outside to the inside is even until it is no longer possible to cut through them in an even number. The area cut through by the notch from the outside to the inside forms the notch area. Starting from the second outermost annular channel, each annular channel through which the notch passes has a U-shaped notch structure with the opening to the left. From the outside to the inside, the annular channels with notches are alternately closed with baffles along the circumference of the notches, forming a structure in which the notched annular channels and the notched unclosed annular channels are alternately nested along the radial direction of the cylinder from the outside to the inside. The second outermost annular channel is the first notched annular channel. The dispersion cylinder is located in the jet mixing zone and is set coaxially with the cylinder. The upstream end of the dispersion cylinder is open and becomes the open end of the dispersion cylinder. The downstream end of the dispersion cylinder is closed with a head and becomes the closed end of the dispersion cylinder. Injection holes are opened on the cylinder wall of the dispersion cylinder.

[0013] Within the gas feeding zone, the dividing plate is vertically fixed to the air intake baffle, dividing the gas feeding zone into a first gas feeding zone and a second gas feeding zone. The first gas feeding zone corresponds to the non-notched area on the air intake baffle, and the air intake baffle in the corresponding area has a first gas channel hole. The first gas channel holes are all connected to the notched closed annular channel. The first gas channel holes are distributed circumferentially along the notched closed annular channel, and the first gas inlet is connected to the first gas feeding zone. The second gas feeding zone corresponds to the notched area on the air intake baffle, and the air intake baffle in the corresponding area has a second gas channel hole. The second gas feeding zone is connected to the notched area through the second gas channel hole. The notched area is connected to the notched unclosed annular channel, and the second gas inlet is connected to the second gas feeding zone.

[0014] The first gas inlet is either an oxygen inlet or an ethylene inlet, and the corresponding second gas inlet is either an ethylene inlet or an oxygen inlet.

[0015] The first gas channel hole can be a circular or arc-shaped slit, and the second gas channel hole can be any suitable shape.

[0016] The baffles used to seal the annular channel include two quadrilateral baffles along the axial direction of the injection ring and one arc-shaped baffle along the circumferential direction of the injection ring. The three baffles are connected end to end to circumferentially seal the gap in the annular channel, ensuring that oxygen and ethylene do not mix after entering the cylinder. The length of the quadrilateral baffle is the length of the gap along the axial direction of the injection ring, and its width is the radial width of the annular channel. The length of the arc-shaped baffle is the arc length corresponding to the angle of each gap along the circumferential direction of the injection ring, and its width is the radial width of the annular channel.

[0017] The baffles create independent flow channels for oxygen and ethylene. After entering their respective channels, oxygen and ethylene gradually transition from the initial partial annular channel to the complete annular flow channel, thus achieving uniform jet mixing of oxygen and ethylene.

[0018] The length of the notch along the spray ring axis should preferably be between 50 mm and 1000 mm.

[0019] The opening angle of the notch along the circumferential direction of the spray ring should preferably be above 270 degrees and below 350 degrees.

[0020] The cylinder can be composed of a shell and a head. The closed end can be sealed by a head or a flange cover. The open end allows the mixed gas to enter the subsequent process. Considering the ease of manufacturing and the central symmetry for uniform distribution, the cylinder should preferably be cylindrical with a diameter of 400-5000 mm.

[0021] The specific number of spray rings can be determined according to the actual working conditions, preferably 2 to 12, and more preferably 4 to 8. The spray rings are nested in layers, with larger rings inside smaller rings, along the radial direction of the cylinder, and all are coaxially arranged with the cylinder.

[0022] As an improvement, the intake baffle can be tilted, with an angle of 30 to 60 degrees being preferable. The tilted intake baffle serves two purposes: firstly, it guides the airflow, allowing it to enter the entire radial and circumferential cross-section of the cylinder more evenly; secondly, it better withstands the main impact of the airflow, reducing the impact on the cylinder wall and resulting in a smoother flow field. When the intake baffle is tilted, it is an elliptical inclined plate, and the left end of the injection ring has a slope consistent with the tilt angle of the inclined plate.

[0023] As an improvement, to accelerate the uniform diffusion of the second gas within the unsealed annular channel after passing through the second gas channel orifice, a gas guide plate is installed behind the inlet baffle and within the unsealed annular channel. The gas guide plate is fixed to the inner wall of the cylinder and the injection ring, allowing the gas to diffuse more quickly and uniformly along the circumferential direction of the unsealed annular channel while diffusing axially along the cylinder. The height of the gas guide plate is preferably one-third to two-thirds of the radial width of the unsealed annular channel.

[0024] As an improvement, to ensure that ethylene and oxygen form a jet mixture, the radial width of the ethylene annular channel is greater than the radial width of the oxygen annular channel.

[0025] As an improvement, the outermost annular channel of the distribution area is an ethylene annular channel.

[0026] As an improvement, the innermost injection ring has an internal channel for ethylene.

[0027] The dispersion tube is preferably cylindrical, and its closed end cap can be flat, conical, or spherical. The closed end cap has no openings; all the mixed gas entering the dispersion tube exits through the injection holes in the tube wall and mixes with the gas that did not enter the dispersion tube in the annular region between the dispersion tube and the tube wall, greatly enhancing the mixing effect. Alternatively, the closed end can be partially sealed, meaning injection holes can also be provided on the closed end cap. When injection holes are provided, some of the mixed gas entering the dispersion tube will be directly ejected from the end cap, weakening the mixing intensity within the jet mixing zone and reducing the mixing effect. The greater the opening ratio of the end cap, the greater the decrease in mixing effect.

[0028] When the dispersion cylinder is cylindrical, its diameter should preferably be 40% to 80% of the cylinder's diameter. The injection holes on the cylinder wall and end cap are evenly distributed circumferentially along the cylinder wall. These holes can be circular, slits, or other shapes. From a manufacturing convenience perspective, the injection holes should preferably be circular, with a diameter of 2 to 40 mm, preferably 4 to 30 mm. The mixed gas inside the dispersion cylinder is ejected from the injection holes, forming staggered contact with the annular mixed gas flowing from front to back, ensuring thorough mixing.

[0029] As a further option, in order to make the gas flow in the mixer smoother, the injection holes on the wall of the dispersion cylinder should be opened from the inside out in the direction of gas flow, so that the gas inside the cylinder is injected into the gas flow outside the cylinder. The angle between the opening direction and the axis of the dispersion cylinder should be 10 degrees to 70 degrees, preferably 30 degrees to 60 degrees.

[0030] As a further improvement, the opening ratio and opening size of the injection holes on the wall of the dispersion cylinder gradually decrease from front to back along the cylinder wall axis. This reduces the pressure drop while ensuring the mixing effect. Most of the gas inside the cylinder is ejected from the front end of the dispersion cylinder, resulting in a small pressure drop and a long contact time with the gas outside the dispersion cylinder, thus improving the mixing effect. A small portion of the gas inside the cylinder is ejected from the rear end, resulting in a high ejection velocity, which enhances the mixing effect through velocity difference.

[0031] The dispersion cylinder is fixedly connected to the inner wall of the cylinder via support columns. The fixed connection can be either detachable or non-detachable. Detachable connections can be achieved by adding bolts, threads, grooves, clamps, or collars; non-detachable connections can be achieved through welding, riveting, etc. The number of support columns can be set to one, two, or more, depending on the actual situation. If a detachable connection is used, the dispersion cylinder can be removed from the mixer for inspection, cleaning, or replacement during equipment shutdown and maintenance; if a non-detachable connection is used, the installation method is simpler. If the mixer diameter is small, or the mixer operating temperature is not high, or if the mixing medium is unlikely to adhere to and clog the dispersion cylinder and its injection holes, a non-detachable connection is recommended.

[0032] The determination of the injection ring length can be considered from the following two aspects:

[0033] On one hand, the first gas enters the first gas annular channel through the first gas inlet and the first gas channel hole. After bypassing the gap opened by the injection ring, it diffuses into the area within the first gas annular channel where no first gas directly enters. Once the first gas is evenly distributed circumferentially within the first gas annular channel, it enters the jet mixing zone. The first gas annular channel serves to guide and rectify the first gas, ensuring its uniform circumferential distribution within the channel; therefore, the injection ring is required to have a certain axial length.

[0034] On the other hand, after the second gas enters the cylinder through the second gas inlet and the second gas channel hole, it diffuses around the notch opened by the injection ring into the area within the second gas annular channel where no second gas directly enters. Once the second gas is evenly distributed circumferentially within the second gas annular channel, it then enters the jet mixing zone. The injection ring rectifies the circumferential flow of the second gas, achieving a uniform circumferential distribution within the second gas annular channel; therefore, the injection ring also requires a certain axial length.

[0035] The final length of the injection ring is the greater of the two lengths determined above, with a certain margin reserved to provide greater operational flexibility. Since the total flow area of ​​the first gas channel orifice is 75%–95% of the total area of ​​the first gas annular channel, which is significantly higher than the total flow area of ​​the first gas channel orifice in existing technologies, the circumferential diffusion area of ​​the first gas in the first gas annular channel is smaller. This shortens the first gas rectification length and makes it easier to achieve circumferential uniformity within the injection ring. Considering the first gas medium, the axial length of the injection ring can be shortened by more than 30%. Similarly, due to the U-shaped notch on the injection ring, the flow area is large, significantly increasing the total flow area of ​​the second gas orifice compared to existing technologies. Therefore, the second gas can diffuse more quickly in the circumferential and radial directions within the second gas annular channel. This makes it easier for the second gas to achieve circumferential uniformity outside the injection ring and shortens the rectification length. Considering the second gas medium, the axial length of the injection ring can be shortened by more than 25%. Therefore, the axial length of the injection ring can be shortened by more than 25%, resulting in a reduction of the axial length of the mixing system by more than 20%, achieving advantages such as saving mixing system size, reducing footprint, lowering engineering costs, and improving the reliability of the mixing system.

[0036] After ethylene and oxygen are rectified by the injection ring and evenly distributed within their respective annular channels, they enter the jet mixing zone. By controlling the area of ​​the oxygen annular channel, the oxygen delivery velocity within the channel reaches 20 m / s to 100 m / s. The rapidly moving oxygen fluid is injected at high speed into the relatively slow main fluid, i.e., the ethylene flow. At the jet boundary, due to the velocity difference between the oxygen jet and the main ethylene flow, a mixing layer is formed. This mixing layer extends along the flow direction of the oxygen jet, entraining and mixing the main fluid ethylene into the oxygen jet, achieving the purpose of rapid passage through the explosion range and rapid mixing. When designing the size of the annular channel, the position of the injection ring, and the location of the ethylene inlet, it is necessary to ensure that the oxygen ejected from different oxygen annular channels does not cross or collide with the wall within a certain distance, so as to control the mixing ratio of oxygen and ethylene and avoid explosion. In the jet mixing zone, ethylene and oxygen are first jet-mixed. The oxygen rapidly passes through the explosion hazard zone, and after further mixing in the dispersion tube, it moves away from the explosion range and leaves the mixing equipment.

[0037] As a further improvement, the ethylene and oxygen mixing system can be equipped with an electrostatic grounding device to eliminate the influence of static electricity on the mixing process, prevent static electricity accumulation, increase the safety of the mixing system, and enhance intrinsic safety.

[0038] As a further improvement, considering the extremely high risk of the mixing system, an explosion-proof wall can be installed outside the ethylene and oxygen mixing system to minimize losses in extreme accident conditions.

[0039] As a further improvement, considering the extremely high risk of the mixing system, the ethylene and oxygen mixing system can be equipped with an interlocking control system. When the oxygen content at the measuring point exceeds the standard, the oxygen supply is reduced or an inert gas such as nitrogen is introduced from the oxygen inlet to keep the mixing process away from the explosion limit.

[0040] The present invention has the following beneficial effects:

[0041] 1) By utilizing the injection and entrainment effects of high-speed oxygen, ethylene and oxygen are rapidly passed through the explosion limit and mixed quickly, reducing the physical and temporal domains of the mixing process and achieving the goal of safe mixing;

[0042] 2) Through the first air inlet hole, the second gas inlet hole, and the notched injection ring, oxygen and ethylene enter the mixing system in the same direction, realizing the separate guidance and distribution of oxygen and ethylene, reducing the impact of fluid on the injection ring, and improving the safety and service life of the mixing system.

[0043] 3) Oxygen and ethylene can develop and distribute more evenly in their respective annular channels more quickly, which makes the axial length of the mixing system shorter, the mixing system more compact, occupies less space, has higher space utilization, and is safer and more reliable.

[0044] 4) By setting up a dispersion cylinder, ethylene and oxygen are mixed more thoroughly in the jet mixing zone, thus improving the mixing effect;

[0045] 5) The safety of the hybrid system is ensured by electrostatic elimination devices, explosion-proof walls, and interlocking control systems. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of the present invention;

[0047] Figure 2 yes Figure 1 View from AA direction;

[0048] Figure 3 yes Figure 1 Schematic diagram of the structure of the gap area;

[0049] Figure 4 yes Figure 1 BB view;

[0050] Figure 5 yes Figure 1 C-C view;

[0051] Figure 6 This is a schematic diagram of the unfolded structure of the dispersion cylinder wall;

[0052] Figure 7 This is a schematic diagram of the fixed connection of the dispersion cylinder.

[0053] In the diagram: 1-First gas inlet, 2-First gas feeding zone, 3-Inlet baffle, 4-Notched closed annular channel, 5-Cylinder, 6-Injection ring, 7-Jet mixing zone, 8-Distribution zone, 9-Notched unclosed annular channel, 10-Arc-shaped baffle, 11-Second gas inlet, 12-Second gas feeding zone, 13-First gas channel hole, 14-Divider plate, 15-Second gas channel hole, 16-Notched area, 17-Quadrilateral baffle, 18-Support column, 19-Injection hole, 20-Dispersion cylinder. Detailed Implementation

[0054] The invention will now be further described with reference to the accompanying drawings.

[0055] like Figures 1-7 As shown. The mixing system for mixing ethylene and oxygen provided by the present invention includes a cylinder 5 and a first gas inlet 1, a second gas inlet 11, two dividing plates 14, an inlet baffle 3, a jet ring 6, and a dispersion cylinder 20 arranged sequentially from left to right along the axis of the cylinder. The cylinder 5 is cylindrical, closed at one end and open at the other end. There are six jet rings 6, which are cylindrical with open ends. One end is fixed to the inlet baffle 3 along the axis of the cylinder 5. The large rings of the jet rings 6 are nested inside the small rings, and are arranged coaxially with the cylinder 5. The inlet baffle 3 is perpendicular to the axis of the cylinder 5. The space between the inlet baffle 3 and the closed end of the left end of the cylinder 5 forms a gas feeding zone. The space inside the cylinder 5 where the inlet baffle 3 and the jet rings 6 are located forms a distribution zone 8. The space between the jet rings 6 and the open end of the right end of the cylinder 5 forms a jet mixing zone 7.

[0056] The intake baffle 3 and the injection ring 6 divide the distribution area 8 into several annular channels with decreasing diameters along the radial direction of the cylinder 5 from the outside to the inside. At the left end of the injection ring 6, which is close to the intake baffle 3, a notch is cut along the axial direction of the cylinder 5 to the right and along the radial direction of the cylinder 5 from the outside to the inside. The notch is U-shaped with its opening to the left (see...). Figure 3 The notch cuts through the six injection rings 6 sequentially from the outside in, and the area cut through by the notch from the outside in forms the notch area 16 (see...). Figure 1 and Figure 3 Starting from the outermost annular channel, each annular channel through which the gap passes has a U-shaped gap structure opening to the left. From the outside to the inside, the annular channels with gaps are alternately closed along the circumference of the gaps by two quadrilateral baffles 17 and one arc-shaped baffle 10 connected end to end (see...). Figure 3 This forms a structure in which closed annular channels 4 and unclosed annular channels 9 are arranged alternately from the outside to the inside along the radial direction of the cylinder 5 (see...). Figure 3 The outermost annular channel is the first gap-closed annular channel 4.

[0057] Within the gas feeding zone, the two dividing plates 14 are vertically fixed to the air intake baffle 3, dividing the gas feeding zone into a first gas feeding zone 2 and a second gas feeding zone 12. The first gas feeding zone 2 corresponds to the area corresponding to the non-notched area 16 on the air intake baffle 3. A first gas channel hole 13 is opened on the air intake baffle 3 in the corresponding area. All first gas channel holes 13 are connected to the notched closed annular channel 4. The first gas channel holes 13 are distributed circumferentially along the notched closed annular channel 4, forming a continuous arc-shaped slit. The first gas inlet 1 and the first gas feeding zone 2... The first gas feed zone 2 is connected to the notched closed annular channel 4 through the first gas channel hole 13; the second gas feed zone 12 corresponds to the area corresponding to the notched area 16 on the air intake baffle 3, and the air intake baffle 3 in the corresponding area has a second gas channel hole 15. The second gas feed zone 12 is connected to the notched area 16 through the second gas channel hole 15. The notched area 16 is connected to the notched unclosed annular channel 9. The second gas inlet 11 is connected to the second gas feed zone 12; the second gas channel hole 15 is a fan shape corresponding to the shape of the notched area 16.

[0058] The first gas inlet 1 is an oxygen inlet, and the second gas inlet 11 is an ethylene inlet. The unclosed annular channel 9 is an ethylene annular channel, and the closed annular channel 4 is an oxygen annular channel. The radial width of the ethylene annular channel is greater than that of the oxygen annular channel. The outermost annular channel of the distribution area 7 is an ethylene annular channel, and the innermost injection ring's internal channel is also an ethylene channel.

[0059] The dispersion cylinder 20 is located in the jet mixing zone 7 and is fixed to the inner wall of the cylinder body 5 by the support column 18. The cylinder wall of the dispersion cylinder 20 is provided with injection holes 19. The closed end cap of the dispersion cylinder 20 is conical and no injection holes are provided on the conical end cap; of course, injection holes may also be provided on the end cap of the dispersion cylinder 20.

[0060] Figure 6 This is a schematic diagram of the unfolded structure of the dispersion cylinder wall. The diagram shows one distribution of the injection holes 19. The opening ratio and the opening size of the injection holes gradually decrease from front to back along the axis of the dispersion cylinder wall.

[0061] Figure 7 This is a schematic diagram of the structure of the dispersion cylinder fixed connection. As shown in the figure, the dispersion cylinder 20 is fixedly connected to the inner wall of the cylinder body 5 by three support columns 18.

[0062] like Figures 1-3 As shown, when this invention is working:

[0063] Ethylene enters the second gas feed zone 12 from the second gas inlet 11, enters the gap zone 16 through the second gas channel hole 15, and after bypassing the gap opened by the injection ring 6, diffuses into the areas in the unclosed annular channels 9 where no ethylene directly enters. When the ethylene is evenly distributed in the unclosed annular channels 9, it enters the jet mixing zone 7.

[0064] Oxygen enters the first gas feed zone 2 from the first gas inlet 1, and enters the closed annular channel 4 with each gap through the first gas channel hole 13 on the gas inlet baffle 3. In the closed annular channel 4 with each gap, it first diffuses to the area where no oxygen directly enters. After the oxygen is evenly distributed in the closed annular channel 4 with each gap, it enters the jet mixing zone 7.

[0065] Within the jet mixing zone 7, ethylene and oxygen are first jet-mixed and then further mixed in the dispersion cylinder 20 to achieve the desired mixing effect.

Claims

1. A mixing system for mixing ethylene and oxygen, characterized in that: It includes a cylinder and a first gas inlet, a second gas inlet, a dividing plate, an inlet baffle, a jet ring, and a dispersion cylinder arranged sequentially from left to right along the cylinder axis; the cylinder is cylindrical, closed at one end and open at the other end; there are multiple jet rings, which are cylindrical with open ends, one end of which is fixed to the inlet baffle along the cylinder axis and coaxially arranged with the cylinder; the space between the inlet baffle and the closed end of the cylinder forms a gas feeding zone, the space inside the cylinder where the inlet baffle and the jet ring are located forms a distribution zone, and the space between the jet ring and the open end of the cylinder forms a jet mixing zone; The intake baffle and injection ring divide the distribution area into annular channels with decreasing diameter from the outside to the inside along the radial direction of the cylinder. The left end of the injection ring, which is close to the intake baffle, cuts a notch along the injection ring axis to the right and along the radial direction of the cylinder from the outside to the inside. The notch is U-shaped with the opening to the left. The number of injection rings cut through by the notch from the outside to the inside is even until it is no longer possible to cut through them in an even number. The area cut through by the notch from the outside to the inside forms the notch area. Starting from the second outermost annular channel, each annular channel through which the notch passes has a U-shaped notch structure with the opening to the left. From the outside to the inside, the notched annular channels are alternately closed with baffles along the circumference of the notch, forming a structure in which the notched annular channels and the notched unclosed annular channels are alternately nested along the radial direction of the cylinder from the outside to the inside. The second outermost annular channel is the first notched annular channel. The dispersion tube is located in the jet mixing zone and is coaxially arranged with the tube body. The upstream end of the dispersion tube is open and becomes the open end of the dispersion tube, while the downstream end of the dispersion tube is closed with a head and becomes the closed end of the dispersion tube. Injection holes are opened on the wall of the dispersion tube. Within the gas feeding zone, the dividing plate is vertically fixed to the air intake baffle, dividing the gas feeding zone into a first gas feeding zone and a second gas feeding zone. The first gas feeding zone corresponds to the non-notched area on the air intake baffle, and the air intake baffle in the corresponding area has a first gas channel hole. The first gas channel holes are all connected to the notched closed annular channel. The first gas channel holes are distributed circumferentially along the notched closed annular channel, and the first gas inlet is connected to the first gas feeding zone. The second gas feeding zone corresponds to the notched area on the air intake baffle, and the air intake baffle in the corresponding area has a second gas channel hole. The second gas feeding zone is connected to the notched area through the second gas channel hole. The notched area is connected to the notched unclosed annular channel, and the second gas inlet is connected to the second gas feeding zone. The first gas inlet is either an oxygen inlet or an ethylene inlet, and the corresponding second gas inlet is either an ethylene inlet or an oxygen inlet.

2. The mixing system for mixing ethylene and oxygen according to claim 1, characterized in that: The first gas channel hole is a circular or arc-shaped slit.

3. The mixing system for mixing ethylene and oxygen according to claim 1, characterized in that: The baffle includes two quadrilateral baffles along the axis of the spray ring and one arc-shaped baffle along the circumferential direction of the spray ring. The three baffles are connected end to end to circumferentially close the gap in the annular channel.

4. The mixing system for mixing ethylene and oxygen according to claim 1, characterized in that: The intake baffle is inclined and is an elliptical inclined plate with an inclination angle of 30 degrees to 60 degrees. The left end of the injection ring is a slope with the same inclination angle as the inclined plate.

5. The mixing system for mixing ethylene and oxygen according to any one of claims 1 to 4, characterized in that: The first gas inlet is an oxygen inlet, and the second gas inlet is an ethylene inlet.

6. The mixing system for mixing ethylene and oxygen according to claim 5, characterized in that: The radial width of the unclosed annular channel with the notch is greater than the radial width of the closed annular channel with the notch.

7. The mixing system for mixing ethylene and oxygen according to claim 5, characterized in that: The innermost injection ring has an internal channel for ethylene.

8. The mixing system for mixing ethylene and oxygen according to claim 6, characterized in that: The innermost injection ring has an internal channel for ethylene.

9. The mixing system for mixing ethylene and oxygen according to any one of claims 1 to 4, characterized in that: The opening ratio and opening size of the injection holes on the cylinder wall gradually decrease from front to back along the cylinder wall axis.

10. The mixing system for mixing ethylene and oxygen according to any one of claims 1 to 4, characterized in that: The injection holes on the wall of the dispersion cylinder are opened from the inside out in the direction of gas flow.

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