Internal circulation type reactor

Abstract

The utility model provides an internal circulation type reactor, which is characterized in that a gas phase, a liquid phase or a solid-liquid mixed phase is uniformly distributed in the reactor by optimizing the number and position distribution of sub-gas inlets and sub-feed ports of the reactor, and the openings of the sub-feed ports are designed to be upward, so that the gas phase, the liquid phase or the solid-liquid mixed phase is uniformly distributed in the reactor. Under the combined action, the liquid phase or the solid-liquid mixed phase realizes inner circulation type feeding in which the outer side ascends and the center descends in the reactor, and the retention time of the liquid phase or the solid-liquid mixed phase in the reactor is prolonged, so that the interaction effect of the gas phase and the liquid phase or the solid-liquid mixed phase is improved, and the efficiency of physical and chemical reaction in the reactor is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical reactor equipment, and particularly relates to an inner loop flow reactor. Background Art

[0002] In recent years, with the development of various chemical and environmental processes, researchers have attempted to introduce microbubble technology into various reaction vessels. By strengthening the interaction between the gas phase and the solid-liquid phase, the diffusion, reaction, and fragmentation effects are enhanced, thereby achieving the goal of improving the working efficiency of the reaction equipment. However, due to the differences in reaction vessels, the results achieved are inconsistent. For a type of reaction vessel with a solid-liquid phase introduced at the top and a gas source introduced at the bottom, microbubbles enter the reaction vessel along with the solid and liquid phases through a dissolved gas device. Once in the reaction vessel, they begin to release and float upward. This results in a short microbubble action time and a lack of significant improvement in the diffusion and mass transfer effect. As a result, the working efficiency of the reaction equipment has not been significantly improved. At present, improvements to reactor equipment still cannot meet the development of chemical processes.

[0003] For example, CN103769008A discloses a slurry bed internal circulation reactor, which adopts a segmented design of the draft tube and heat exchange tube and a gas distributor with a short tube nozzle plate structure to reduce the impact of gas on the descent of the slurry in the draft tube, control the stability of the bed temperature, and evenly distribute the synthesis gas to the reaction area. However, when used for slurries containing microbubbles, this reactor still cannot solve the problem of short action time caused by the floating of microbubbles, and its working efficiency is still limited. CN205146188U discloses an internal circulation fluidized bed reactor, which includes a shell, and the shell includes a three-phase separation section and a reaction section from top to bottom; also includes a three-phase separation component arranged in the three-phase separation section; a guide tube is arranged in the reaction section; a gas uniform distribution device is arranged below the lower opening of the guide tube, at least one material distributor is arranged in the guide tube and above the gas uniform distribution device, and a plurality of baffles are arranged on the outer wall of the upper opening of the guide tube; also includes a baffle arranged above the guide structure; also includes a plurality of gas separation tubes connected to the guide structure. However, this reactor is aimed at feeding both the liquid phase and the gas phase at the lower part of the reactor, and the device structure is complex and occupies a large area.

[0004] In response to the above situation, the utility model provides an internal loop reactor to improve the uniformity of airflow distribution in the reactor and the interaction effect between the gas phase and the liquid phase or the solid-liquid phase, thereby enhancing the reaction effect and improving the working efficiency of the reactor. Utility Model Content

[0005] In response to the problems existing in the prior art, the purpose of the present invention is to provide an internal circulation reactor. By designing the positions of the feed pipe and the air inlet pipe, as well as the number and position distribution of the sub-feed port and the sub-air inlet, the liquid phase or solid-liquid mixed phase material forms an internal circulation feeding mode inside the reactor in which the outside rises and the center descends, thereby extending the residence time of the liquid phase or solid-liquid mixed phase material inside the reactor, improving the interaction effect between the gas phase and the liquid phase or the solid-liquid mixed phase, and thus improving the efficiency of the physical and chemical reactions in the reactor.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] The utility model provides an internal loop flow reactor, which comprises a reactor cylinder, an air inlet pipe arranged on one side close to the bottom of the reactor cylinder, and a feed pipe arranged on the upper part of the air inlet pipe;

[0008] The air inlet pipe comprises at least two air inlet pipes stacked up and down in a radial direction, the air inlet pipe comprising an annular pipe arranged outside the reactor cylinder and an air inlet arranged at any position around the annular pipe; the inner wall of the annular pipe extends circumferentially toward the interior of the reactor cylinder to form m evenly distributed sub-air inlets;

[0009] The feed pipe includes a feed port arranged on the outer wall of the reactor cylinder, and the feed port extends a first feed part into the interior of the reactor; a second feed part extends toward the bottom of the reactor cylinder from a side of the first feed part away from the feed port; n evenly distributed sub-feed pipes are extended circumferentially in the horizontal direction from a side of the second feed part close to the bottom of the reactor cylinder; a sub-feed port extends from the side of the sub-feed pipe away from the second feed part, and the opening of the sub-feed port is upward.

[0010] The air inlet pipe includes at least two air inlet pipes stacked up and down in a radial direction, for example, two, three, four, five or six air inlet pipes, etc. The direction of the sub-air inlet is perpendicular to the radial direction.

[0011] The internal circulation reactor described in the present invention is configured with at least two air inlet pipes radially stacked in upper and lower layers on one side near the bottom of the reactor barrel, so that the gas phase in the reactor is evenly distributed, and is equipped with a sub-feed port opening upward, so that the liquid phase or solid-liquid mixed phase material forms an internal circulation feeding mode in which the outside rises and the center descends in the reactor, thereby prolonging the residence time of the liquid phase or solid-liquid mixed phase inside the reactor, allowing the gas phase and the liquid phase or solid-liquid mixed phase to fully interact, thereby improving the reaction efficiency; especially for utilizing microbubbles to enhance the reaction between the gas phase and the liquid phase or the solid-liquid mixed phase, the sub-feed port opening upward suppresses the release of microbubbles from the liquid phase or the solid-liquid mixed phase material, prolongs the action time of the microbubbles, and thus improves the reaction effect.

[0012] The internal loop reactor provided by the utility model is suitable for various reactions that require the introduction of a gas phase into the lower part of the reactor and a liquid phase or a solid-liquid mixed phase into the upper part, and utilizes the gas phase to directly participate in or promote the diffusion of substances, such as extraction separation or flotation separation.

[0013] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objectives and beneficial effects of the present invention can be better achieved.

[0014] Preferably, the internal loop reactor includes a discharge port arranged on one side of the bottom of the reactor cylinder.

[0015] Preferably, the center lines of the reactor barrel, the second feed part and the air inlet pipe coincide with each other.

[0016] Preferably, the air intake pipe includes two air intake pipes stacked up and down in the radial direction, and the air intake pipe arranged on the upper layer is the first air intake pipe, and the air intake pipe arranged on the lower layer is the second air intake pipe.

[0017] Preferably, the first air inlet pipe includes a first annular pipe arranged outside the reactor cylinder and a first air inlet arranged at any position around the first annular pipe.

[0018] Preferably, the second air inlet pipe includes a second annular pipe arranged outside the reactor cylinder and a second air inlet arranged at any position around the second annular pipe.

[0019] Preferably, the inner wall of the first annular tube extends circumferentially toward the interior of the reactor cylinder to form m1 uniformly distributed first sub-gas inlets, wherein m1≥4, for example, it can be 4, 6, 8, 10, 12 or 14, etc., preferably 4-12.

[0020] Preferably, the inner wall of the second annular tube extends circumferentially toward the interior of the reactor cylinder to form m2 uniformly distributed second sub-air inlets, wherein m2≥3, for example, it can be 3, 4, 5, 6, 7 or 8, preferably 3-6.

[0021] Preferably, the number n of the sub-feed ports is the same as the number m1 of the first sub-gas inlets.

[0022] Preferably, the circumferential position of the sub-feed port is the same as the circumferential position of the first sub-air inlet.

[0023] The present invention further prefers that the number and circumferential position of the sub-feed ports are the same as the number and circumferential position of the first sub-feed ports, which is beneficial to the uniform distribution of the gas phase and the liquid phase or the solid-liquid mixed phase, and sufficient interaction, thereby improving the reaction efficiency.

[0024] Preferably, the distance between the first sub-gas inlet and the outer wall of the reactor cylinder is 5-30% of the radius of the reactor cylinder, for example, 5%, 10%, 15%, 20%, 25% or 30%.

[0025] Preferably, the distance between the second sub-gas inlet and the outer wall of the reactor cylinder is 60-90% of the radius of the reactor cylinder, for example, it can be 60%, 65%, 70%, 75%, 80%, 85% or 90%.

[0026] Preferably, the height h1 of the first annular tube from the bottom of the reactor cylinder accounts for 15-30% of the total height h of the reactor cylinder, for example, 15%, 20%, 24%, 27% or 30%.

[0027] Preferably, the height h2 of the second annular tube from the bottom of the reactor cylinder accounts for 10-20% of the total height h of the reactor cylinder, for example, 10%, 15% or 20%.

[0028] Preferably, the pressure in the second annular tube is 1 / 4 to 2 / 3 of the pressure in the first annular tube; for example, it can be 1 / 4, 1 / 3, 1 / 2 or 2 / 3.

[0029] Preferably, the gas flow rate of the second sub-gas inlet is 1 / 4 to 1 / 2 of the gas flow rate of the first sub-gas inlet, for example, 1 / 4, 1 / 3, or 1 / 2. Preferably, the height h3 of the sub-feed pipe from the bottom of the reactor cylinder is 30% to 50%, such as 30%, 35%, 40%, 45%, or 50%, of the total height h of the reactor cylinder.

[0030] The utility model further adjusts the position, pressure and gas flow of the inner and outer sub-inlets (the outer layer is the first sub-inlet, the inner layer is the second sub-inlet). The outer layer uses high pressure and large flow to drive the mixed phase material at the feed inlet to rise, and the inner layer uses low pressure and small flow to increase the interaction strength of the gas, liquid and solid phases without affecting the downward flow of the mixed phase material, thereby improving the physical and chemical reaction effect in the reactor.

[0031] The numerical range described in the present invention includes not only the point values ​​listed above, but also any point values ​​between the above numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) The utility model provides an internal circulation reactor, which is characterized by stacking at least two air inlet pipes radially up and down on one side near the bottom of the reactor cylinder, and evenly distributing m sub-air inlets respectively, so that the gas phase in the reactor is evenly distributed, and then a feed pipe is provided on the upper part of the air inlet pipe and n evenly distributed sub-feed pipes are extended, which cooperate with the sub-feed inlets opening upward, so that the liquid phase or solid-liquid phase mixture material forms an internal circulation feeding mode inside the reactor, which first rises from the outside and then descends from the center, thereby extending the residence time of the liquid phase or solid-liquid mixed phase inside the reactor, thereby improving the interaction effect between the gas phase and the liquid phase or the solid-liquid mixed phase, and then improving the efficiency of the physical and chemical reactions in the reactor, and improving the working efficiency of the reactor. Moreover, the internal circulation reactor is suitable for various gas phase and liquid phase or solid-liquid phase reactions, especially for reactions that use microbubbles doped in liquid phase or solid-liquid phase materials to improve reaction efficiency. The internal circulation feeding mode of rising outside and descending center suppresses the release of microbubbles, increases the action time of microbubbles, and thus improves the reaction effect of such reactions.

[0034] (2) The utility model provides an internal loop flow reactor, which further extends the residence time of the liquid phase and the solid-liquid phase in the reactor, further improves the interaction effect between the gas phase and the liquid phase or the solid-liquid phase, thereby further improving the reaction efficiency of the reaction inside the reactor, and the internal loop flow reactor has a simple structure and occupies a small area. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic structural diagram of the inner loop flow reactor provided in Example 1 of the present utility model;

[0036] Figure 2 1 is a schematic diagram of the top view of the air inlet pipe in the inner loop reactor provided in Example 1 of the present invention and a schematic diagram of the position distribution of the first sub-air inlet and the second sub-air inlet;

[0037] Figure 3 This is a schematic diagram of the structure of the sub-feed pipe and the position distribution of the sub-feed port in the inner loop reactor provided in Example 1 of the present invention;

[0038] Explanation of the accompanying symbols: 1. Reactor cylinder; 2. Air inlet pipe; 210. First air inlet pipe; 211. First annular pipe; 212. First air inlet; 213. First sub-air inlet; 220. Second air inlet pipe; 223. Second sub-air inlet; 3. Feed pipe; 310. Second feed part; 311. Sub-feed pipe; 312. Sub-feed port; 320. Feed port; 4. Discharge port. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0040] It should be understood that in the description of the present invention, the terms "upper," "lower," "inner," "outer," "bottom," "top," "horizontal," and "center" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are used solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Terms such as "first" and "second" do not indicate the importance of components and therefore should not be construed as limiting the present invention. The specific dimensions used in this embodiment are intended only to illustrate the technical solution and do not limit the scope of protection of the present invention.

[0041] Example 1

[0042] This embodiment provides an internal loop reactor, such as Figures 1 to 3 As shown, the inner loop flow reactor includes a reactor barrel 1, an air inlet pipe 2 arranged near the bottom side of the reactor barrel 1, a feed pipe 3 arranged on the upper part of the air inlet pipe 2, and a discharge port 4 on the bottom side of the reactor barrel 1;

[0043] The air inlet pipe 2 includes two air inlet pipes stacked up and down in the radial direction, and the air inlet pipe 2 arranged in the upper layer is the first air inlet pipe 210, and the air inlet pipe 2 arranged in the lower layer is the second air inlet pipe 220; the first air inlet pipe 210 includes a first annular pipe 211 arranged on the outside of the reactor cylinder 1 and a first air inlet 212 arranged at any position around the first annular pipe 211; the inner wall of the first annular pipe 211 extends circumferentially to the inside of the reactor cylinder 1 to form 8 evenly distributed first sub-air inlets 213; the height h1 of the first annular pipe 211 from the bottom of the reactor cylinder 1 accounts for 20% of the total height h of the reactor cylinder 1; the first sub-air inlet 2 The distance from the outer wall of the reactor cylinder 1 to the second inlet pipe 220 is 20% of the radius of the reactor cylinder 1; the second inlet pipe 220 includes a second annular pipe arranged on the outside of the reactor cylinder 1 and a second air inlet arranged at any position around the second annular pipe (the arrangement method is the same as the first annular pipe and the first air inlet, and is no longer marked); the inner wall of the second annular pipe extends circumferentially to the inside of the reactor cylinder 1 to form four evenly distributed second sub-air inlets 223; the height h2 of the second annular pipe from the bottom of the reactor cylinder 1 is 15% of the total height h of the reactor cylinder 1; the distance from the second sub-air inlet 223 to the outer wall of the reactor cylinder 1 is 80% of the radius of the reactor cylinder 1;

[0044] The pressure in the second annular tube is 1 / 2 of the pressure in the first annular tube 211 ; the gas flow rate of the second sub-gas inlet 223 is 1 / 3 of the gas flow rate of the first sub-gas inlet 213 ;

[0045] The feed pipe 3 includes a feed port 320 arranged on the outer wall of the reactor cylinder 1, and the feed port 320 extends a first feed part into the interior of the reactor; the first feed part extends a second feed part 310 toward the bottom of the reactor cylinder 1 on a side away from the feed port 320; the second feed part 310 extends 8 evenly distributed sub-feed pipes 311 in a horizontal direction and circumferentially on a side close to the bottom of the reactor cylinder 1; the sub-feed pipe 311 extends a sub-feed port 312 on a side away from the second feed part 310, and the opening of the sub-feed port 312 is upward; the height h3 of the sub-feed pipe 311 from the bottom of the reactor cylinder 1 accounts for 40% of the total height h of the reactor cylinder 1; the center lines of the reactor cylinder 1, the second feed part 310 and the air inlet pipe 2 coincide with each other; the circumferential position of the sub-feed port 312 is the same as the circumferential position of the first sub-air inlet 213.

[0046] In this embodiment, the reactor cylinder 1 has a radius of 1.5 m and a height of 8 m.

[0047] Example 2

[0048] This embodiment provides an internal loop flow reactor, which includes a reactor cylinder, an air inlet pipe arranged near the bottom of the reactor cylinder, a feed pipe arranged above the air inlet pipe, and a discharge port on the bottom of the reactor cylinder.

[0049] The air inlet pipe includes two air inlet pipes stacked up and down in the radial direction, and the air inlet pipe arranged in the upper layer is the first air inlet pipe, and the air inlet pipe arranged in the lower layer is the second air inlet pipe; the first air inlet pipe includes a first annular pipe arranged on the outside of the reactor cylinder and a first air inlet arranged at any position around the first annular pipe; the inner wall of the first annular pipe extends circumferentially to the inside of the reactor cylinder to form 12 evenly distributed first sub-air inlets; the height h1 of the first annular pipe from the bottom of the reactor cylinder accounts for 15% of the total height h of the reactor cylinder; the distance between the first sub-air inlet and the outer wall of the reactor cylinder accounts for 5% of the radius of the reactor cylinder; the second air inlet pipe includes a second annular pipe arranged on the outside of the reactor cylinder and a second air inlet arranged at any position around the second annular pipe; the inner wall of the second annular pipe extends circumferentially to the inside of the reactor cylinder to form 6 evenly distributed second sub-air inlets; the height h2 of the second annular pipe from the bottom of the reactor cylinder accounts for 10% of the total height h of the reactor cylinder; the distance between the second sub-air inlet and the outer wall of the reactor cylinder accounts for 60% of the radius of the reactor cylinder;

[0050] The pressure in the second annular tube is 1 / 4 of the pressure in the first annular tube; the gas flow rate of the second sub-gas inlet is 1 / 4 of the gas flow rate of the first sub-gas inlet;

[0051] The feed pipe includes a feed port provided on the outer wall of the reactor cylinder, wherein the feed port extends into a first feed portion inwardly of the reactor; a second feed portion extends from a side of the first feed portion away from the feed port toward the bottom of the reactor cylinder; 12 evenly distributed sub-feed pipes extend horizontally and circumferentially from a side of the second feed portion close to the bottom of the reactor cylinder; a sub-feed port extends from a side of the sub-feed pipe away from the second feed portion, and the opening of the sub-feed port faces upward; a height h3 of the sub-feed pipe from the bottom of the reactor cylinder accounts for 30% of the total height h of the reactor cylinder;

[0052] The center lines of the reactor cylinder, the second feed part and the air inlet pipe coincide with each other; the circumferential position of the sub-feed port is the same as the circumferential position of the first sub-air inlet.

[0053] In this embodiment, the radius of the reactor cylinder is 2 m and the height is 12 m.

[0054] Example 3

[0055] This embodiment provides an internal loop flow reactor, which includes a reactor cylinder, an air inlet pipe arranged near the bottom of the reactor cylinder, a feed pipe arranged above the air inlet pipe, and a discharge port on the bottom of the reactor cylinder.

[0056] The air inlet pipe includes two air inlet pipes stacked up and down in the radial direction, and the air inlet pipe arranged in the upper layer is the first air inlet pipe, and the air inlet pipe arranged in the lower layer is the second air inlet pipe; the first air inlet pipe includes a first annular pipe arranged on the outside of the reactor cylinder and a first air inlet arranged at any position around the first annular pipe; the inner wall of the first annular pipe extends circumferentially to the inside of the reactor cylinder to form four evenly distributed first sub-air inlets; the height h1 of the first annular pipe from the bottom of the reactor cylinder accounts for 30% of the total height h of the reactor cylinder; the distance between the first sub-air inlet and the outer wall of the reactor cylinder accounts for 30% of the radius of the reactor cylinder; the second air inlet pipe includes a second annular pipe arranged on the outside of the reactor cylinder and a second air inlet arranged at any position around the second annular pipe; the inner wall of the second annular pipe extends circumferentially to the inside of the reactor cylinder to form three evenly distributed second sub-air inlets; the height h2 of the second annular pipe from the bottom of the reactor cylinder accounts for 20% of the total height h of the reactor cylinder; the distance between the second sub-air inlet and the outer wall of the reactor cylinder accounts for 90% of the radius of the reactor cylinder;

[0057] The pressure in the second annular tube is 2 / 3 of the pressure in the first annular tube; the gas flow rate of the second sub-gas inlet is 1 / 2 of the gas flow rate of the first sub-gas inlet;

[0058] The feed pipe includes a feed port provided on the outer wall of the reactor cylinder, wherein the feed port extends into a first feed portion in the direction of the reactor interior; a second feed portion extends from a side of the first feed portion away from the feed port toward the bottom of the reactor cylinder; four evenly distributed sub-feed pipes extend horizontally and circumferentially from a side of the second feed portion close to the bottom of the reactor cylinder; a sub-feed port extends from a side of the sub-feed pipe away from the second feed portion, and the opening of the sub-feed port faces upward; a height h3 of the sub-feed pipe from the bottom of the reactor cylinder accounts for 50% of the total height h of the reactor cylinder;

[0059] The center lines of the reactor cylinder, the second feed part and the air inlet pipe coincide with each other; the circumferential position of the sub-feed port is the same as the circumferential position of the first sub-air inlet.

[0060] In this embodiment, the radius of the reactor cylinder is 2 m and the height is 8 m.

[0061] Example 4

[0062] This embodiment provides an internal loop reactor, wherein the height h3 of the sub-feed pipe from the bottom of the reactor cylinder accounts for 60% of the total height h of the reactor cylinder, and the rest is the same as that of embodiment 1.

[0063] Since the sub-feed pipe of the inner loop reactor described in this embodiment is located at the upper part of the reactor barrel, the outer rising distance is short, which shortens the residence time of the liquid or solid-liquid mixed phase material inside the reactor, resulting in low reaction efficiency.

[0064] Comparative Example 1

[0065] This comparative example provides a reactor, which is the same as Example 1 except that the sub-feed port is opened downward.

[0066] Since the reactor in this comparative example opens downward due to the sub-feed port, the feed cannot be fed from the outside and must be directly lowered, resulting in a shorter residence time of the liquid phase or solid-liquid mixed phase in the reactor, thereby affecting the interaction between the gas phase and the liquid phase or solid-liquid mixed phase materials in the reactor, resulting in a decrease in reaction efficiency.

[0067] Comparative Example 2

[0068] This comparative example provides a reactor which is the same as Example 1 except that the second air inlet pipe is not provided.

[0069] Since the reactor in this comparative example is not equipped with a second air inlet pipe, the overall gas phase distribution inside the reactor is uneven, with less gas phase distribution at the center. The material descending from the center cannot fully contact the gas phase and cannot fully interact with the liquid phase or solid-liquid mixed phase material, thereby resulting in a decrease in reaction efficiency.

[0070] In summary, the utility model provides an internal loop flow reactor, which can make the gas phase evenly distributed, and the liquid phase or solid-liquid mixed phase is fed in an internal loop flow manner that first rises from the outside and then descends from the center, thereby extending the residence time of the liquid phase or solid-liquid mixed phase material in the reactor, improving the interaction effect between the gas phase and the liquid phase or solid-liquid mixed phase material inside the reactor, thereby improving the reaction efficiency of the physical and chemical reactions in the reactor.

[0071] The applicant declares that while the above-described embodiments illustrate the detailed structural features of the present invention, the present invention is not limited to these detailed structural features, nor does it imply that the present invention must rely on these detailed structural features in order to be implemented. Persons skilled in the art should understand that any improvements to the present invention, equivalent replacements for selected components, additions of auxiliary components, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. An internal loop reactor, characterized in that: The inner loop reactor comprises a reactor cylinder, an air inlet pipe arranged on one side close to the bottom of the reactor cylinder, and a feed pipe arranged on the upper part of the air inlet pipe; The air inlet pipe comprises at least two air inlet pipes stacked up and down in a radial direction, the air inlet pipe comprising an annular pipe arranged outside the reactor cylinder and an air inlet arranged at any position around the annular pipe; the inner wall of the annular pipe extends circumferentially toward the interior of the reactor cylinder to form m evenly distributed sub-air inlets; The feed pipe includes a feed port arranged on the outer wall of the reactor cylinder, and the feed port extends a first feed part into the interior of the reactor; a second feed part extends toward the bottom of the reactor cylinder from a side of the first feed part away from the feed port; n evenly distributed sub-feed pipes are extended circumferentially in the horizontal direction from a side of the second feed part close to the bottom of the reactor cylinder; a sub-feed port extends from the side of the sub-feed pipe away from the second feed part, and the opening of the sub-feed port is upward.

2. The internal loop reactor according to claim 1, characterized in that The center lines of the reactor barrel, the second feed part and the air inlet pipe coincide with each other.

3. The internal loop reactor according to claim 1, characterized in that The air intake pipe includes two air intake pipes stacked up and down in a radial direction, wherein the air intake pipe arranged on the upper layer is a first air intake pipe, and the air intake pipe arranged on the lower layer is a second air intake pipe.

4. The internal loop reactor according to claim 3, characterized in that The first air inlet pipe includes a first annular pipe arranged outside the reactor cylinder and a first air inlet arranged at any position around the first annular pipe; The second air inlet pipe includes a second annular pipe arranged outside the reactor cylinder and a second air inlet arranged at any position around the second annular pipe.

5. The internal loop reactor according to claim 4, characterized in that The inner wall of the first annular tube extends circumferentially toward the interior of the reactor cylinder to form m1 uniformly distributed first sub-gas inlets, where m1 is ≥ 4; The inner wall of the second annular tube circumferentially extends toward the interior of the reactor cylinder to form m2 evenly distributed second sub-air inlets, where m2≥3.

6. The internal loop reactor according to claim 5, characterized in that The number n of the sub-feed ports is the same as the number m1 of the first sub-gas inlets; The circumferential position of the sub-feed port is the same as the circumferential position of the first sub-air inlet.

7. The internal loop reactor according to claim 5, characterized in that The distance between the first sub-gas inlet and the outer wall of the reactor cylinder is 5 to 30% of the radius of the reactor cylinder; The distance between the second sub-gas inlet and the outer wall of the reactor cylinder accounts for 60-90% of the radius of the reactor cylinder.

8. The internal loop reactor according to claim 4, characterized in that The height h1 of the first annular tube from the bottom of the reactor cylinder accounts for 15-30% of the total height h of the reactor cylinder.

9. The internal loop reactor according to claim 4, characterized in that The height h2 of the second annular tube from the bottom of the reactor cylinder accounts for 10-20% of the total height h of the reactor cylinder.

10. The internal loop reactor according to claim 1, characterized in that The height h3 of the sub-feed pipe from the bottom of the reactor cylinder accounts for 30-50% of the total height h of the reactor cylinder.

Images