A solid distributor system for a circulating countercurrent bed reactor and its application method

Abstract

The present invention belongs to the technical field of devices for chemical method applications, and specifically relates to a solid distributor system for a circulating countercurrent bed reactor and an application method thereof. The solid distributor system includes a conveyor, a settler, an air duct, a solid distributor and a reactor; the conveyor is integrally formed, including a regeneration inclined tube and a lower agent port; the solid distributor is installed in the reactor through an annular support and a support rod, and the solid distributor is a single-layer disk or a double-layer disk, and the catalyst particles slide evenly by setting openings and inclination angles. When used, the catalyst particles are transported from the regeneration inclined tube to the bottom of the lower agent port, pass through the settler and the reactor and fall onto the solid distributor, quickly tilt and slide outward from the center, and disperse evenly to avoid accumulation of falling particles on the solid distributor. The air duct connected up and down can solve the problem that particles are difficult to fall due to the installation of a solid distributor, ensure the stability of the particle circulation rate, and realize the steady-state long-cycle operation of the entire circulating countercurrent bed.

Description

Technical Field

[0001] The present invention belongs to the technical field of devices for applying chemical methods, and specifically relates to a solid distributor system of a circulating countercurrent bed reactor and an application method thereof, which can be applied to the fields of petrochemical industry, coal pyrolysis, waste plastic cracking, coking, etc. Background Art

[0002] In the circulating countercurrent bed reactor, solid particles move downward from the top of the reactor, while the gas moves upward, and the gas-solid phase is in a countercurrent contact state. The gas-solid contact efficiency is better than that of the co-current bed, which is beneficial to mass transfer and heat transfer between the gas and solid phases, and can significantly improve the reaction efficiency and the yield of the target product. The circulating countercurrent bed device can be used in the fields of petrochemicals, coal pyrolysis, waste plastic cracking, coking, etc. As far as the catalytic cracking waste plastic reactor is concerned, in the axial direction of the reactor, the reaction temperature and the active atmosphere of the catalyst are continuously increased and enhanced as the reaction proceeds, which can meet the energy demand of the negative correlation between the molecular weight of the same hydrocarbons and the cracking activation energy, and can achieve the purpose of adapting the optimal cracking conditions for hydrocarbons of different molecular weights in the process of waste plastic cracking, and improve the selectivity of the target product short-chain low-carbon olefins.

[0003] The circulating countercurrent bed reactor currently used has a high reactor height-to-diameter ratio due to the comprehensive requirements of waste plastic processing volume and reaction time. The radial solid phase concentration distribution of the high aspect ratio reactor is extremely uneven during the particle falling process, and there is a "ring-core" flow structure, that is, the particle concentration is higher at the side wall and lower at the center. The traditional solid distributor system is mostly a distribution plate distributor, and there is an annular gap between the solid distributor system and the inner wall of the reactor, which cannot really solve the "ring-core" flow structure; and the problem that the installation of a solid distributor system will hinder the passage of rising gas and cause difficulty in particle falling is also rarely considered. Therefore, it is particularly necessary to design a reasonable solid distributor system to make the radial solid phase particle distribution more uniform and enable the particles to fall smoothly.

[0004] The premise of installing the distributor is that the particles have good symmetry in all directions. At present, the mainstream of circulating countercurrent bed devices adopts oblique single-tube regeneration oblique tubes, but the oblique single-tube structure has serious bias flow, so it is necessary to design a reasonable solid distributor system to solve the problems of bias flow and uneven distribution. Summary of the invention

[0005] The invention provides a solid distributor system of a circulating countercurrent bed reactor and an application method thereof, so as to solve the problems of bias flow, poor symmetry, uneven radial distribution of particles and gas velocity hindering the falling of solid particles in the solid distributor system.

[0006] The technical solutions adopted are:

[0007] A solid distributor system for a circulating countercurrent bed reactor comprises a settler and a reactor, wherein the settler is connected to the reactor via an inclined gentle slope, and further comprises a conveyor, an air guide pipe and a solid distributor;

[0008] The conveyor comprises a regeneration inclined tube and a lower dosage port, wherein the regeneration inclined tube is an inclined single tube structure, and the lower dosage port is a T-shaped blind end structure, and the opposite end of the blind end is connected to the regeneration inclined tube, and the regeneration inclined tube and the lower dosage port are integrally formed;

[0009] The outlet of the lower dose port faces the center of the solid distributor, the solid distributor is evenly provided with openings, and is installed inside the reactor or the settler;

[0010] The air guide pipe is connected between the reactor and the settler outside the solid distributor.

[0011] Preferably, the solid distributor is a conical disk, and its disk is a double inverted L-shape, which includes, from the inside to the outside, an inner inclined disk area, a middle annular gap area, and an outer inverted inclined area, which respectively account for 80%, 6%, and 14% of the diameter of the solid distributor disk; the outer inverted inclined area is connected to the reactor wall; a bridge is provided in the middle annular gap area to connect the inner inclined disk area and the outer inverted inclined area, and vertical openings are evenly arranged in the three areas; the solid distributor is installed in the reactor through an annular support and a support rod, and the annular support is clamped on the inclined gentle slope surface of the settler.

[0012] Preferably, the inclination angle of the internal inclined disk area is smaller than the repose angle of the catalyst particles used, and the inclination angle is 0.1 to 10 degrees less than the repose angle; the internal inclined disk area includes an inner circle, a middle circle, and an outer circle, which respectively account for 40%, 35%, and 25% of the diameter of the internal inclined disk area; circular holes are evenly opened in the three circles, and the diameter of the circular holes decreases from the inside to the outside, and the porosity is 20 to 40%; the external inverted inclined area is a serrated structure, and its porosity is 1% to 10%.

[0013] Preferably, the solid distributor is a three-section conical disk, which consists of an inner inclined conical area, a middle inclined disc area and an outer inverted inclined support area from the inside to the outside, and the three parts are smoothly connected by a gentle slope, wherein: the outer side of the outer inverted inclined support area is connected to the reactor wall, and is connected to the annular support above by a support rod; the inner inclined conical area, the middle inclined disc area and the outer inverted inclined support area account for 14%, 70% and 16% of the diameter of the solid distributor disk, respectively; the inclination angle of the inner inclined conical area is greater than the repose angle of the catalyst solid particles used, and the inclination angle is 5 to 15 degrees higher than the repose angle of the catalyst solid particles used; the inclination angle of the middle inclined disc area is less than the repose angle of the catalyst solid particles used, and the inclination angle is 1 to 5 degrees lower than the repose angle of the catalyst solid particles used.

[0014] Preferably, the rectangular openings arranged in the inner inclined conical area increase successively from the inside to the outside, and the opening rate is 20-30%; the middle inclined disk area is provided with a bridge to connect the inner inclined conical area and the outer inverted inclined support area, and the opening rate is 50-70%; the outer inverted inclined support area is perpendicular to the middle inclined disk area, and the outer inverted inclined support area is a gear-like structure, and its opening rate is 5-20%.

[0015] Preferably, the solid distributor is a double-layer inclined conical disk, including an upper disk and a lower disk. The upper disk structure is W-shaped, and its outer side is connected to the inclined gentle slope surface of the settler through a support rod and an annular support, and its center position is opposite to the outlet of the lower agent port; the lower disk structure is V-shaped, installed in the reactor, and its outer side is connected to the reactor wall; the upper disk and the lower disk are connected by a support rod, and the support rod is vertically attached to the reactor wall.

[0016] Preferably, the upper disk surface includes an upper inner ring, an upper outer ring, and an upper gear ring. The upper inner ring is an arc disk surface on which vertical circular openings are evenly arranged. The upper outer ring is evenly arranged with vertical rectangular openings. The upper inner ring and the upper outer ring are connected by a smooth curved surface. The upper gear ring is a gear disk surface on which gear-shaped openings perpendicular to the reactor wall are arranged. The lower disk surface includes a lower inner ring, a lower middle ring, and a lower outer ring. The rings are connected by a smooth curved surface, and uniform circular openings are arranged on the disk surface.

[0017] Preferably, the inclination angle of the lower layer middle circle is smaller than the repose angle of the catalyst solid particles used, and the inclination angle is 1 to 5 degrees less than the repose angle.

[0018] Preferably, 4 to 8 air guide pipes are arranged, which are evenly distributed at equal angles around the reactor and the settler outside the solid distributor; the top connection port of the air guide pipe is located on the side wall of the settler above the lower agent port, and the bottom connection port is located on the side wall of the reactor below the solid distributor.

[0019] An application method of a solid distributor system of a circulating countercurrent bed reactor comprises the following steps:

[0020] (1) Install the conveyor, air duct and solid distributor;

[0021] (2) A connection hole is provided on the annular wall of the settler to match the regeneration inclined tube of the conveyor. The regeneration inclined tube extends out of the annular wall of the settler through the connection hole to connect to the regenerator. The catalyst particles are transported from the regenerator to the bottom of the lower agent port through the conveying air of the regeneration inclined tube, and then fall onto the solid distributor through the settler and the reactor.

[0022] (3) After the catalyst particles fall onto the solid distributor, the solid distributor allows the particles to quickly slide down from the center to the outside and disperse evenly, thus preventing the falling particles from accumulating on the solid distributor and achieving continuous falling at a high circulation flux.

[0023] (4) The air duct connects the settler and the reactor up and down to realize the transmission of countercurrent wind up and down the solid distributor. There is no particle accumulation above the solid distributor, and the particles fall smoothly and stably, thereby realizing the steady-state long-term operation of the reaction.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The conveyor used in the present invention can solve the problem of biased flow when particles are fed into a single oblique tube, and meets the prerequisite that the particles must be distributed radially symmetrically when adding a solid distributor.

[0026] (2) The solid distributor used in the present invention adopts a combination of inclined surfaces and openings, and sets different inclination angles to eliminate the ring-core flow uneven distribution structure of radial particles in the circulating countercurrent bed, thereby achieving radial uniform distribution of particles.

[0027] (3) The upper and lower connected air ducts used in the present invention can solve the problem that particles are difficult to fall due to the installation of a solid distributor, ensure the stability of the particle circulation rate, and realize the steady-state long-term operation of the entire circulating countercurrent bed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of the overall structure of Example 1 of the present invention.

[0029] Figure 2 It is a front view of the conveyor of the present invention.

[0030] Figure 3 1 is a top view of the solid distributor of Example 1 of the present invention.

[0031] Figure 4 This is a front view of the solid distributor according to Example 1 of the present invention.

[0032] Figure 5 This is a top view of the solid distributor of Example 2 of the present invention.

[0033] Figure 6 This is a front view of the overall structure of Example 3 of the present invention.

[0034] Figure 7 This is a top view of the upper disk of the solid distributor in Example 3 of the present invention.

[0035] Figure 8 This is a top view of the lower disk of the solid distributor in Example 3 of the present invention.

[0036] Fig. 9 This is an axial position diagram of the measurement site of the reactor in the test example of the present invention.

[0037] Fig.10 Radial position azimuth diagram of the reactor measurement site in the test example of the present invention.

[0038] Fig.11 This is a comparison curve of the dimensionless radial position and solid volume fraction in the NS direction for different lower dose port structures in Test Example 1 of the present invention.

[0039] Fig.12 This is a comparison curve of the dimensionless radial position and solid volume fraction in the WE direction for different lower nozzle structures in Test Example 1 of the present invention.

[0040] Fig.13 This is a comparison curve of the dimensionless radial position and the solid volume fraction when the axial height Z is 210 mm when there is no solid distributor and when there is a solid distributor in Test Example 2 of the present invention.

[0041] Fig.14 This is a comparison curve of the dimensionless radial position and the solid phase volume fraction when the axial height Z is 40 mm when there is no solid distributor and when there is a solid distributor in Test Example 2 of the present invention.

[0042] In the figure, 1. regeneration inclined tube; 2. lower agent port; 3. settler; 4. air guide tube; 5. reactor; 6. solid distributor; 7. inner inclined disc area; 8. middle annular gap area; 9. outer inverted inclined area; 10. inner ring; 11. middle ring; 12. outer ring; 13. bridge; 14. support rod; 15. annular support; 16. blind end; 17. annular partition; 18. fixed slot; 19. outer inverted inclined support area, 20. middle inclined disc area, 21. outer ring, 22-inner ring; 23. inner inclined conical area; 24. upper disc surface, 25. upper gear ring, 26. upper outer ring, 27. upper inner ring; 28. lower disc surface, 29. lower outer ring, 30. lower middle ring, 31. lower inner ring. DETAILED DESCRIPTION

[0043] The accompanying drawings are only for illustrative purposes. The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0044] The present invention has been applied to the cold state device and the hot state device of the waste plastic circulating countercurrent bed. The cold state device is made of acrylic organic glass, and the hot state device is made of 304 stainless steel material due to the need for high temperature of waste plastic cracking; and the cold state device and the hot state device have the same size, and the inner diameter of the reactor 5 is 10 cm.

[0045] Example 1.

[0046] like Figure 1 , 2 As shown, a solid distributor system of a circulating countercurrent bed reactor of the present invention comprises a conveyor, a settler 3, an air guide pipe 4, a solid distributor 6 and a reactor 5; the conveyor is integrally formed, comprising a regeneration inclined tube 1 and a lower agent port 2, the lower agent port 2 is a T-shaped blind end 16 structure, the opposite end of the blind end 16 of the lower agent port 2 is connected to the regeneration inclined tube 1, and the connection is a smooth curved surface connection to ensure smooth transportation of catalyst particles, and an annular partition 17 is arranged inside the vertical section of the lower agent port 2. The solid distributor 6 is made of 304 stainless steel, and the other components are the same as the materials used in the existing cold or hot devices.

[0047] like Figure 3 , 4 As shown, the solid distributor 6 is a conical disk surface, and its disk surface is a double inverted L-shape, which includes, from inside to outside, an inner inclined disk area 7, a middle annular gap area 8, and an outer inverted inclined area 9, and the outer inverted inclined area 9 is connected to the wall of the reactor 5.

[0048] There are 8 air guide pipes 4 with a diameter of 12 mm; the diameter of the solid distributor 6 is the same as the inner diameter of the reactor 5, which is 10 cm. The inner, middle and outer zones account for 80%, 6% and 14% of the diameter of the solid distributor 6 respectively; the inner, middle and outer layers of the internal inclined disk zone 7 account for 40%, 35% and 25% of the diameter of the internal inclined disk zone 7 from the inside to the outside respectively. The opening diameters of the three layers are different, and the openings are all vertical circular holes. The opening diameters decrease from the inside to the outside, and the opening diameters are 6 mm, 5 mm and 4 mm respectively. The porosity of the internal inclined disk zone 7 is 17%, the porosity of the middle annular zone 8 is 9%, and the porosity of the external inverted inclined zone 9 is 4%. The total porosity is the sum of the three: 30%.

[0049] Installation of solid distributor 6: A partial front view of solid distributor 6 is shown in FIG. Figure 4As shown. Six support rods 14 are arranged on the circumferential edge of the solid distributor 6, and an annular support 15 is arranged on the support rods 14. First, the six support rods 14 are fixed to the circumferential edge of the solid distributor 6 and are close to the inner wall of the reactor 5. After the support rods 14 extend vertically upward by 10 cm from the solid distributor 6, they begin to extend obliquely upward by 30° according to the angle of the inclined surface of the settler 3. Finally, the six support rods 14 are welded to the annular support 15 with a diameter of 13.5 cm. During installation, the solid distributor 6 is placed vertically into the reactor 5 at the top of the reactor 5, and the upper part is fixed to the inclined surface of the settler 3 by the annular support 15; the inclined surface of the settler 3 is provided with four fixing slots 18, and the annular support 15 can be embedded into the slots for fixing.

[0050] During the experiment, the structure of the regeneration inclined tube 1 and the lower agent port 2 can make the catalyst particles transported to the reactor 5 symmetrically distributed; the air guide pipe 4 can realize the transmission of countercurrent wind from the upper and lower sides of the solid distributor 6, there is no particle accumulation above the solid distributor 6, and the particles fall smoothly and stably; thereby achieving steady-state long-term operation of the entire circulating countercurrent bed reaction.

[0051] In the cold state embodiment, the particle concentration at seven radial positions at each axial height in the reactor is measured by an optical fiber concentration tester to reflect the particle concentration distribution in the reactor. The main explanations are: (1) the influence of the structure of the regeneration inclined tube 1 and the lower agent port 2 on the radial symmetry in the reactor 5; (2) the improvement effect of the installation of a solid distributor on the radial "ring-core" uneven flow in the reactor.

[0052] The hot state example uses a hot state device to catalytically crack waste plastics at high temperature to explore the distribution of waste plastic catalytic cracking products before and after the installation of a solid distributor system, and then explains the effect of the installation of a solid distributor system on mass transfer, heat transfer and reaction efficiency in a circulating countercurrent bed reactor.

[0053] Example 2.

[0054] like Figure 5 As shown, the solid distributor 6 is a three-section conical disk, which, from inside to outside, is an inner inclined conical area 23, a middle inclined disc area 20 and an outer inverted inclined support area 19, and the three parts are smoothly connected by a gentle slope, wherein; the outer side of the outer inverted inclined support area 19 is connected to the wall of the reactor 5, and is connected to the annular support 15 above through a support rod 14; the inner inclined conical area 23, the middle inclined disc area 20 and the outer inverted inclined support area 19 account for 14%, 70% and 16% of the disk diameter of the solid distributor 6 respectively; the inclination angle of the inner inclined conical area 23 is greater than the repose angle of the catalyst solid particles used, and the inclination angle is 10 degrees higher than the repose angle of the catalyst solid particles used; the inclination angle of the middle inclined disc area 20 is less than the repose angle of the catalyst solid particles used, and the inclination angle is 1 degree lower than the repose angle of the catalyst solid particles used.

[0055] The outlet of the lower dose port 2 faces the center of the inner inclined conical area 23 .

[0056] The middle inclined disk area 20 is provided with a bridge to connect the inner inclined conical area 23 and the outer inverted inclined support area 19, and the three areas are provided with evenly distributed rectangular openings. The inner inclined conical area 23 is provided with 4 rows of equally distributed rectangular openings from the inside to the outside, and the area of ​​the rectangular openings increases from the inside to the outside, and the opening rate is 30%.

[0057] The central inclined disk area 20 includes an inner ring 22 and an outer ring 21, which respectively account for 12% and 88% of the disk area of ​​the central inclined disk area. Both layers are provided with rectangular openings equidistantly distributed from the inside to the outside, wherein the area of ​​the rectangular openings of the inner ring 22 remains unchanged, and the area of ​​the rectangular openings of the outer ring 21 increases sequentially from the inside to the outside; the total opening rate of the central inclined disk area 20 is 60%.

[0058] The outer inverted inclined support area 19 is perpendicular to the middle inclined disc area 20. The outer inverted inclined support area 19 is a gear-shaped structure, and its opening rate is 5-20%.

[0059] Other unmentioned places are the same as those in Example 1.

[0060] Example 3.

[0061] like Figure 6 As shown, the solid distributor 6 is a double-layer inclined conical disk, including an upper disk 24 and a lower disk 28. The upper disk 24 has a W-shaped structure, and its outer side is connected to the inclined gentle slope of the settler 3 through a support rod 14 and an annular support 15, and its center position is opposite to the outlet of the lower agent port 2; the lower disk 28 has a V-shaped structure and is installed in the reactor 5, and its outer side is connected to the wall of the reactor 5; the upper disk 24 and the lower disk 28 are connected by a support rod 14, and the support rod 14 is attached to the wall of the reactor 5.

[0062] like Figure 7 As shown, the upper disk surface 24 is composed of an upper inner ring 27, an upper outer ring 26 and an upper gear ring 25 from the inside to the outside. The upper inner ring 27 is an inclined arc-shaped disk surface, the upper outer ring 26 is an inclined conical disk surface, and the upper gear ring 25 is an annular disk perpendicular to the wall of the reactor 5. The upper gear ring 25 is connected to the wall of the reactor 5.

[0063] like Figure 8 As shown, the lower disk surface 28 is composed of a lower inner ring 31, a lower middle ring 30, and a lower outer ring 29 from the inside to the outside. The lower inner ring 31, the lower middle ring 30, and the lower outer ring 29 are all inclined conical disk surfaces. The lower outer ring 29 is a gear ring, which is connected to the wall of the reactor 5.

[0064] The inner and outer rings of the upper disk 24 account for 20% and 60% of the diameter of the upper disk, respectively, and the diameters of the openings in the two rings are different; the upper inner ring 27 is provided with circular openings equidistantly from the inside to the outside, with an opening rate of 30%; the upper outer ring 26 is provided with openings equidistantly from the inside to the outside, with an opening rate of 30%. The inner, middle and outer rings of the lower layer are all provided with equidistant circular openings, and the diameters of the circular openings increase from the inside to the outside, and the opening rates of the inner, middle and outer rings of the lower layer increase in the range of 30-50%.

[0065] The inclination angle of the upper outer ring 26 is smaller than the repose angle of the catalyst solid particles used, and the inclination angle is 2 degrees less than the repose angle.

[0066] The inclination angle of the lower middle ring 30 is smaller than the repose angle of the catalyst solid particles used, and the inclination angle is 1 degree less than the repose angle.

[0067] The places not mentioned are the same as those in Example 1.

[0068] The system of the present invention was tested using the solid distributor system of Example 1.

[0069] Test example 1.

[0070] This test case includes two groups of cases, namely, an experimental group and a control group, both of which were carried out in a cold circulating countercurrent bed device without the solid distributor 6 installed.

[0071] In this test example, the experimental group used the conveyor of the present invention (blind end 16 with annular partition 17 and lower injection port 2), and the control group used a single tube lower injection port. Both groups of experiments controlled the countercurrent gas velocity in the reactor to be 0.2m / s, and the particle circulation rate to be 8.36kg / (m 2 ·s), the solid concentration at each radial position is measured by an optical fiber concentration tester, and the solid concentration at different radial positions in the NS direction and WE direction of the reactor countercurrent section is measured respectively (expressed as solid volume fraction, which will not be repeated below). The radial position is expressed by dimensionless radial r / R, where r / R=0 at the center and r / R=1 at the side wall. Fig.10 The experimental results of the solid phase concentration in the NS and WE directions measured by the radial position azimuth diagram are shown in Fig.11 , Fig.12 shown.

[0072] like Fig.11 As shown in the figure, the particle concentration on the N side of the single-tube down-dose-mouth structure in the NS direction of the control group is much higher than that on the S side, indicating that the single-tube down-dose-mouth structure will cause the particles to be biased toward the N side in the NS direction. Fig.12 In the control group, the particle concentration in the WE direction is biased toward the W side. That is, the single-tube lower dose structure has a bias flow between the N side and the W side. Fig.11 , Fig.12, the blind end 16 with an annular partition 17 and the lower inlet 2 structure of the experimental group showed good symmetry in both the NS and WE directions, showing the characteristics of low particle concentration in the center and high particle concentration in the side wall. Through the above case analysis, the blind end 16 with an annular partition 17 and the lower inlet 2 structure can ensure good symmetry in both the NS and WE directions in the reactor, which means that all radial positions in the entire reactor 5 have good symmetry, laying the foundation for the installation of the distributor.

[0073] Test example 2.

[0074] This test case includes two groups of cases, namely the experimental group and the control group, both of which are carried out in a cold circulating countercurrent bed device, and the lower dosage port is a blind end 16 with a ring partition 17 and the lower dosage port 2 is provided with an air guide tube 4.

[0075] In this test example, the experimental group was equipped with the solid distributor of the present invention, and the control group was not equipped with a solid distributor. The countercurrent gas velocity in the reactor was controlled to be 0.3 m / s and the particle circulation rate was 8.36 kg / (m 2 •s), and measure the solid concentration at each radial position by using an optical fiber concentration tester. Fig. 9 The axial position azimuth diagram was measured to measure the solid phase concentration at two axial positions of the reactor countercurrent section axial height Z=210mm and Z=40mm. The test results are as follows: Fig.13 , Fig.14 As shown in Test Example 2, it can be seen that the symmetry of each direction in the reactor 5 is good, so the direction measured this time is the N direction of the NS direction.

[0076] like Fig.13 As shown, when the control group did not add the solid distributor 6, a "ring-core" flow structure with low particle concentration at the center and high particle concentration at the side wall was presented in the radial direction; Fig.14 In the control group, when no solid distributor 6 was added, the radial direction also showed a "ring-core" flow structure with low particle concentration in the center and high particle concentration at the side wall; Fig.13 , Fig.14 After the experimental group was equipped with a solid distributor, the particle concentrations at the two axial heights and radial positions were relatively uniform, and the "ring-core" flow structure was significantly improved. Through the above case analysis, the solid distributor system of the present invention has a significant effect on improving the uneven distribution of the radial "ring-core" flow structure, and achieves a uniform distribution of radial particle concentration.

[0077] Test case 3.

[0078] This test case includes two groups of cases, namely the experimental group and the control group. Both experiments were conducted in a waste plastic cracking circulating countercurrent bed hot state device. The circulating countercurrent bed hot state device and the cold state device have the same size. The lower agent port is a blind end 16 with an annular partition 17, and the lower agent port 2 is provided with an air guide pipe 4.

[0079] In this test case, the experimental group was equipped with a solid distributor, while the control group was not equipped with a solid distributor. The hot state experimental feed was domestic waste plastics, the feed rate was 2.0 kg / h, the agent-to-material ratio was 50.64, the reaction temperature was 560°C, the reaction pressure was 60 kPa, and the circulating countercurrent bed operation time was 1 hour. The experimental results are shown in Table 1.

[0080] Table 1 Example 3 - Comparison of product distribution between hot state experiment without solid distributor and with solid distributor:

[0081] Gas phase product yield, % Liquid product yield, % Coke yield, % Unfilled solid distributor 64.95 28.14 6.91 Install solid distributor 77.08 20.89 2.03

[0082] It can be seen from the data in Table 1 that the gas phase product yield in the waste plastic pyrolysis product with the solid distributor is higher than that without the solid distributor, the liquid phase product yield is reduced, and the coke yield is significantly reduced. Through the above test example analysis, the solid distributor system of the present invention can improve the gas-solid flow and heat transfer effect in the circulating countercurrent bed reactor by improving the distribution of radial particle concentration. The uniform particle concentration distribution improves the heat transfer efficiency. The good heat transfer effect can increase the gas phase product yield and reduce the coke yield.

[0083] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A solid distributor system for a circulating countercurrent bed reactor, comprising a settler and a reactor, wherein the settler and the reactor are connected with an inclined gentle slope, characterized in that: Also includes conveyors, air guides and solid distributors; The conveyor comprises a regeneration inclined tube and a lower dosage port, wherein the regeneration inclined tube is an inclined single tube structure, and the lower dosage port is a T-shaped blind end structure, wherein the opposite end of the blind end is connected to the regeneration inclined tube, and the regeneration inclined tube and the lower dosage port are integrally formed; The outlet of the lower dose port faces the center of the solid distributor, the solid distributor is evenly provided with openings, and is installed inside the reactor or the settler; The solid distributor is a conical disk, and its disk is a double inverted L-shape, which is composed of an inner inclined disk area, a middle annular gap area, and an outer inverted inclined area from the inside to the outside, respectively accounting for 80%, 6%, and 14% of the diameter of the solid distributor disk; the outer inverted inclined area is connected to the reactor wall; a bridge is provided in the middle annular gap area to connect the inner inclined disk area and the outer inverted inclined area; the inclination angle of the inner inclined disk area is less than the repose angle of the catalyst particles used, and the inclination angle is 0.1 to 10 degrees less than the repose angle; vertical openings are evenly arranged in the three areas; the solid distributor is installed in the reactor through an annular support and a support rod, and the annular support is clamped on the inclined gentle slope surface of the settler; Alternatively, the solid distributor is a three-section conical disk, which is composed of an inner inclined conical area, a middle inclined disc area and an outer inverted inclined support area from the inside to the outside, and the three parts are smoothly connected by a gentle slope, wherein: the outer side of the outer inverted inclined support area is connected to the reactor wall, and is connected to the annular support above by a support rod; the inner inclined conical area, the middle inclined disc area and the outer inverted inclined support area account for 14%, 70% and 16% of the diameter of the solid distributor disk, respectively; the inclination angle of the inner inclined conical area is greater than the repose angle of the catalyst solid particles used, and the inclination angle is 5 to 15 degrees more than the repose angle of the catalyst solid particles used; the inclination angle of the middle inclined disc area is less than the repose angle of the catalyst solid particles used, and the inclination angle is 1 to 5 degrees less than the repose angle of the catalyst solid particles used; Alternatively, the solid distributor is a double-layer inclined conical disk, including an upper disk and a lower disk, the upper disk structure is W-shaped, and its outer side is connected to the inclined gentle slope surface of the settler through a support rod and an annular support, and its center is directly opposite to the outlet of the lower agent port; the lower disk structure is V-shaped, installed in the reactor, and its outer side is connected to the reactor wall; the upper disk and the lower disk are connected by a support rod, and the support rod is vertically attached to the reactor wall, the lower disk includes a lower inner ring, a lower middle ring and a lower outer ring, and each ring is connected by a smooth curved surface, and uniform circular openings are arranged on the disk, and the inclination angle of the lower middle ring is less than the repose angle of the catalyst solid particles used, and the inclination angle is 1 to 5 degrees less than the repose angle; The air guide pipe is connected between the reactor and the settler outside the solid distributor.

2. The solid distributor system of a circulating countercurrent bed reactor according to claim 1, characterized in that: The inner inclined disk area includes an inner circle, a middle circle, and an outer circle, which respectively account for 40%, 35%, and 25% of the diameter of the inner inclined disk area; circular holes are evenly opened in the three circles, and the diameter of the circular holes decreases from the inside to the outside, and the opening rate is 20-40%; the outer inverted inclined area is a sawtooth structure, and its opening rate is 1%-10%.

3. The solid distributor system of a circulating countercurrent bed reactor according to claim 1, characterized in that: The rectangular openings arranged in the inner inclined conical area increase in size from the inside to the outside, and the opening rate is 20-30%; the middle inclined disc area is provided with a bridge to connect the inner inclined conical area and the outer inverted inclined support area, and the opening rate is 50-70%; the outer inverted inclined support area is perpendicular to the middle inclined disc area, and the outer inverted inclined support area is a gear-like structure, and its opening rate is 5-20%.

4. The solid distributor system of a circulating countercurrent bed reactor according to claim 1, characterized in that: The upper disk surface includes an upper inner ring, an upper outer ring, and an upper gear ring. The upper inner ring is an arc disk surface on which vertical circular openings are evenly arranged. The upper outer ring is evenly arranged with vertical rectangular openings. The upper inner ring and the upper outer ring are connected by a smooth curved surface. The upper gear ring is a gear disk surface on which gear-shaped openings perpendicular to the reactor wall are arranged.

5. The solid distributor system of a circulating countercurrent bed reactor according to claim 1, characterized in that: There are 4 to 8 air guide pipes, which are evenly distributed at equal angles around the reactor and the settler outside the solid distributor; the top connection port of the air guide pipe is located on the side wall of the settler above the lower agent port, and the bottom connection port is located on the side wall of the reactor below the solid distributor.

6. The method for applying the solid distributor system of a circulating countercurrent bed reactor according to any one of claims 1 to 5, characterized in that: The steps include: (1) Install the conveyor, air duct and solid distributor; (2) A connection hole is provided on the annular wall of the settler to match the regeneration inclined tube of the conveyor. The regeneration inclined tube extends out of the annular wall of the settler through the connection hole to connect to the regenerator. The catalyst particles are transported from the regenerator to the bottom of the lower agent port through the conveying air of the regeneration inclined tube, and then fall onto the solid distributor through the settler and the reactor. (3) After the catalyst particles fall onto the solid distributor, the solid distributor allows the particles to quickly slide down from the center to the outside and disperse evenly, thus preventing the falling particles from accumulating on the solid distributor. (4) The air duct connects the settler and the reactor up and down to realize the transmission of countercurrent wind up and down the solid distributor. There is no particle accumulation above the solid distributor, and the particles fall smoothly and stably, thereby realizing the steady-state long-term operation of the reaction.

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