An integrated device and method for waste heat recovery and screening of high-temperature mixed particles

Abstract

The present invention discloses an integrated device and method for waste heat recovery and screening of high-temperature mixed particles, comprising a screening body, a gas distribution section, a fluidizing section, a sorting section, and an outlet section, the cavities of which are interconnected from bottom to top; the fluidizing section comprises a plurality of fluidizing chambers, wherein a distribution plate is provided at the bottom of the fluidizing chamber and a V-shaped sieve plate is provided at the top, and the fluidizing chambers are a plurality of independent fluidizing chambers, which are arranged adjacent to each other; a plurality of heat exchange tubes are provided in each fluidizing chamber; the sorting section comprises a particle inlet pipe provided on the screening body, and a nozzle array is provided below the particle inlet pipe. The present invention integrates two independent functions, namely, wide-screening particle size particle screening and high-temperature particle waste heat recovery, into a set of equipment, which can not only efficiently recover waste heat from particles of different particle sizes, but also conveniently classify and utilize the particles after waste heat recovery, with less energy loss and lower equipment production and operation and maintenance costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas-solid fluidized beds and heat exchangers, and relates to an integrated device and method for recovering waste heat and screening high-temperature mixed particles. Background Art

[0002] Industrial production often produces a large amount of high-temperature products, by-products, and waste residues, and most of them exist in the form of solid particles. These particles contain a large amount of waste heat resources. At present, the metallurgical, building materials and other industries produce more than 4.5 billion tons of high-temperature solid bulk materials each year, and the amount of waste heat resources contained is equivalent to more than 100 million tons of standard coal. Most of the high-temperature solid bulk materials in industrial production are mostly mixtures of particles with a wide particle size distribution. Their density varies greatly and their particle size coverage is wide (generally μm to mm level). Particles of different particle sizes have different physical properties, and their heat transfer coefficients and heat transfer laws are also different. There are significant problems such as difficulty in waste heat recovery and low efficiency.

[0003] Waste heat recovery from pellets is primarily achieved using pellet heat exchangers. Depending on the particle flow state, pellet heat exchangers can be categorized as fixed bed, moving bed, and fluidized bed. Fluidized bed heat exchangers use gas to fluidize solid particles, increasing their mobility and significantly improving the heat transfer coefficient on the particle side, allowing the high-temperature particles to release heat quickly and efficiently. Industrially, high-temperature bulk solids primarily include sintered ore, cement, vanadium-titanium slag, agglomerates, and coke, all of which have a wide particle size distribution. Particles of different sizes have different residence times in the fluidized bed and exhibit varying heat transfer capacities with the heat transfer fluid. Furthermore, widely sized particles are prone to segregation during fluidization, significantly degrading fluidization quality. Agglomerates can also form between different particle phases and between particle phases and the wall, blocking the gas-solid flow path and affecting the stability and uniformity of the fluidization process. Therefore, prior to waste heat recovery from widely sized particles, it is necessary to screen the mixed material. The particle size range after screening is determined based on the intended use of the particles and is generally categorized into the following five levels: silt (<0.125mm), fine sand (0.125-0.25mm), medium sand (0.25-0.5mm), coarse sand (0.5-1mm), and very coarse sand (1-2mm). In existing particle screening technologies, the mainstream approach is to use screens and vibrating screens. While these methods offer high screening accuracy and are relatively simple and convenient to operate, they can also pose challenges such as easy clogging of the screen, discontinuous screening, and low efficiency.

[0004] Currently, mixed material screening and waste heat recovery from pellets remain two separate technical fields, with few reported solutions integrating the two into a single device. Integrating these two distinct processes into a single system would effectively reduce energy losses and significantly lower production and maintenance costs.

[0005] Patent CN108662923A discloses a device for recovering waste heat from high-temperature, wide-screening bulk materials. It uses a "stripe-shaped" screen plate to screen particles of different particle sizes, and uses embedded pipes of different diameters to recover waste heat from the screened particles. This technical solution has the following three problems: (1) The screen plate is easily clogged during the screening process, and the use of a mechanical vibration device increases the system's energy consumption, cost, and operational control difficulty; (2) The screen plate size is fixed and can only screen mixed particles with a specific particle size distribution and density distribution, lacking flexibility; (3) The use of a moving bed to recover the waste heat from the screened particles has a low heat transfer coefficient between the particles and the wall of the embedded pipe, resulting in a significant increase in the heat transfer area and reducing the economic efficiency of the waste heat recovery process. Therefore, there is an urgent need for an integrated device and method for effectively screening and recovering waste heat from high-temperature, wide-screening bulk materials to address the shortcomings of the existing technology. Summary of the Invention

[0006] In order to overcome the problems in the prior art, the purpose of the present invention is to provide an integrated device and method for waste heat recovery and screening of high-temperature mixed particles. The device can integrate the two independent functions of wide-screening particle screening and high-temperature particle waste heat recovery into a set of equipment. It can not only efficiently recover waste heat from particles of different particle sizes, but also conveniently classify and utilize the particles after waste heat recovery, with smaller energy loss and lower equipment production and operation and maintenance costs.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A high-temperature mixed particle waste heat recovery and screening integrated device comprises a screening body, an air distribution section, a fluidizing section, a sorting section and an outlet section, the cavity of the screening body being sequentially connected from bottom to top;

[0009] The fluidizing section includes multiple fluidizing chambers, wherein a distribution plate is provided at the bottom of the fluidizing chamber and a V-shaped sieve plate is provided at the top. The fluidizing chambers are multiple independent fluidizing chambers and are arranged adjacent to each other; each fluidizing chamber is provided with a plurality of heat exchange tubes;

[0010] The sorting section comprises a particle inlet pipe arranged on the screening body, and a nozzle array is arranged below the particle inlet pipe.

[0011] Furthermore, the air distribution section includes a plurality of air chambers, wherein a fluidizing air inlet is provided at the bottom end of each air chamber, and a fluidizing air regulating valve is provided at the fluidizing air inlet.

[0012] Furthermore, the air chamber has an inverted cone structure.

[0013] Furthermore, a particle outlet is provided at the bottom of each fluidized chamber.

[0014] Furthermore, the particle inlet pipe is arranged at an angle, and a spoiler is arranged above the outlet of the particle inlet pipe.

[0015] Furthermore, a roller is provided at the inner end of the particle inlet pipe.

[0016] Furthermore, the rotating roller is a cylindrical structure; a group of scrapers are installed on the rotating roller at equal angle intervals; and the rotating roller is connected to a variable frequency motor.

[0017] Furthermore, the width of the fluidization chamber is determined by the following process:

[0018] There are four fluidized chambers, which are the first fluidized chamber, the second fluidized chamber, the third fluidized chamber and the fourth fluidized chamber along the direction of particle movement;

[0019] The mixed particles are sieved into 4 particle size grades, d P ≥d P1 is the first particle size grade, d P1 >d P ≥d P2 For the second particle size grade, d P2 >d P ≥d P3 For the third particle size grade, d P <d P3 The fourth particle size grade; d P1 , d P2 , d P3 are the first design particle size, the second design particle size and the third design particle size respectively; d P is the mixed particle size;

[0020] When d P1 , d P2 , d P3 When the widths are 2 mm, 1 mm and 0.5 mm respectively, L3≈2L2≈4L1; L1 is the width of the first fluidizing chamber, L2 is the width of the second fluidizing chamber, and L3 is the width of the third fluidizing chamber.

[0021] Furthermore, the height of the V-shaped sieve plate of each fluidized chamber from the particle inlet pipe is determined by the following process:

[0022] The horizontal displacements of the first, second, third, and fourth size grade particles are calculated using the following formulas:

[0023]

[0024]

[0025]

[0026]

[0027] Wherein, S1 is the horizontal displacement of particles of the first size grade, S2 is the horizontal displacement of particles of the second size grade, S3 is the horizontal displacement of particles of the third size grade, S4 is the horizontal displacement of particles of the fourth size grade, v0 is the initial horizontal velocity of the particles after entering the fluidized bed; a1 is the acceleration of particles of the first size grade, a2 is the acceleration of particles of the second size grade, a3 is the acceleration of particles of the third size grade, a4 is the acceleration of particles of the fourth size grade, t1 is the falling time of target particles in the first fluidizing chamber, t2 is the falling time of target particles in the second fluidizing chamber, t3 is the falling time of target particles in the third fluidizing chamber, and t4 is the falling time of target particles in the fourth fluidizing chamber;

[0028] Compare the horizontal displacement of the first particle size grade particles with the width of the first fluidizing chamber, the horizontal displacement of the second particle size grade particles with the width of the second fluidizing chamber, and the horizontal displacement of the third particle size grade particles with the width of the third fluidizing chamber. If the horizontal displacement of the first particle size grade particles with the width of the first fluidizing chamber, the horizontal displacement of the second particle size grade particles with the width of the second fluidizing chamber, and the horizontal displacement of the third particle size grade particles with the width of the third fluidizing chamber are not equal, adjust the jet speed and flow rate to change the magnitude of the force acting on the particles, and recalculate the horizontal displacements of the first particle size grade particles, the second particle size grade particles, and the third particle size grade particles until the horizontal displacement of the first particle size grade particles is equal to the width of the first fluidizing chamber, the horizontal displacement of the second particle size grade particles is equal to the width of the second fluidizing chamber, and the horizontal displacement of the third particle size grade particles is equal to the width of the third fluidizing chamber.

[0029] A waste heat recovery and screening method based on the fluidized high-temperature mixed particle waste heat recovery and screening device as described above comprises the following steps:

[0030] Dry hot air is sprayed into the fluidizing chamber through the nozzle array, and the particles flow evenly into the sorting section through the particle inlet pipe. The thin layer of particles entering the sorting section is screened by the horizontal jet ejected by the nozzle array, and the particles with the largest particle size or density fall into the fluidizing chamber close to the particle inlet pipe; the particles are screened into particles of different sizes by the sorting section, and then flow evenly into each fluidizing chamber through the V-shaped sieve plate, and are completely fluidized under the action of the fluidizing air. During the fluidization process, heat is exchanged with the heat exchange pipes in the fluidizing chamber to complete waste heat recovery.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention integrates two independent functions, wide-screening particle screening and high-temperature particle waste heat recovery, into a set of equipment. It can not only efficiently recover waste heat from particles of different particle sizes, but also conveniently classify and utilize the particles after waste heat recovery. Compared with the current mainstream non-integrated technical solutions, the present invention has smaller energy losses and lower equipment production and operation and maintenance costs. Fluidization technology is introduced for waste heat recovery, and several independent fluidization chambers are set according to the particle size distribution and density characteristics. Each chamber adopts an optimized fluidization wind speed and heat exchange tube size, which can minimize the energy consumption of the fluidization process and improve the particle-tube wall heat transfer coefficient, thereby further improving the economy of the integrated device. By providing a V-shaped sieve plate, the uniformity of particle distribution can be improved, and the influence of fluidization wind on the sorting process can be reduced.

[0033] Furthermore, the roller speed, the nozzle array jet speed and the fluidizing wind speed of each chamber can be adjusted according to the particle size distribution and density distribution characteristics of the incoming particle mixture, with flexible operation and strong adaptability.

[0034] Furthermore, a roller mechanism with a scraper is provided at the end of the particle inlet pipe, which utilizes the rotating scraping action to form a thin layer of particles, thereby effectively improving the screening efficiency of mixed particles based on the horizontal jet action.

[0035] Furthermore, the installation of spoilers can prevent particles from short-circuiting. The special structural design of spoilers and V-shaped screen plates ensures the stable and efficient operation of the integrated device.

[0036] In the present invention, the particles are screened into particles of different particle sizes through the sorting section, and then flow evenly into each fluidizing chamber through the V-shaped sieve plate, and are completely fluidized under the action of the fluidizing wind. During the fluidization process, heat exchange is carried out with the heat exchange pipes in the fluidizing chamber to complete waste heat recovery. At the same time, the screening of bulk materials with different high-temperature and wide screening particle sizes is achieved with high screening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a structural schematic diagram of a fluidized high-temperature mixed particle integrated waste heat recovery and screening device of the present invention.

[0038] Figure 2 It is a top view of the distribution plate of each fluidizing chamber.

[0039] Figure 3 It is a top view of the V-shaped sieve plate.

[0040] Figure 4 1 and 2 are the front view and isometric view of the roller 12 and the scraper mechanism, wherein (a) is the front view and (b) is the isometric view.

[0041] Among them: 1-fluidizing air inlet, 2-fluidizing air regulating valve, 3-air chamber, 4-gas distribution section, 5-fluidizing section, 6-V-shaped sieve plate, 7-small particle movement trajectory, 8-sorting section, 9-outlet section, 10-mixed gas outlet, 11-spoiler, 12-roller, 13-particle inlet, 14-nozzle air volume regulating valve, 15-nozzle array, 16-large particle movement trajectory, 17-sieve hole, 18-heat exchange tube, 19-distribution plate, 20-particle outlet, 21-distribution plate hole, 22-motor, 23-scraper. DETAILED DESCRIPTION

[0042] The present invention is described in detail below with reference to the accompanying drawings.

[0043] See also Figure 1-Figure 4 The present invention provides an integrated device for waste heat recovery and screening of high-temperature mixed particles, comprising a screening body, a gas distribution section 4, a fluidizing section 5, a sorting section 8, and an outlet section 9 interconnected in sequence from bottom to top within the screening body. Several mixed gas outlets 10 are provided at the top of the screening body.

[0044] The air distribution section 4, located at the bottom of the device, includes a fluidizing air inlet 1, a fluidizing air regulating valve 2, and several air chambers 3. Each air chamber 3 has a fluidizing air inlet 1 at its bottom, and a fluidizing air regulating valve 2 installed at each of these inlet 1s. The fluidizing air regulating valve 2 controls the volume and velocity of the fluidizing air entering each air chamber 3. The air chambers 3 have an inverted conical structure, ensuring uniform distribution of the fluidizing air.

[0045] See also Figure 2 and Figure 3 The fluidizing section 5 is located above the gas distribution section 4 (between the distribution plate 19 and the V-shaped sieve plate 6), and is separated from the gas distribution section 4 by the distribution plate 19. It mainly includes the distribution plate 19, the fluidizing chamber, the particle outlet 20, the heat exchange tube 18, the V-shaped sieve plate 6, and other structures. The fluidizing chambers are multiple independent fluidizing chambers, and are arranged adjacent to each other. Along the horizontal direction, the width of the fluidizing chamber increases successively. Figure 2 A plurality of distribution plate holes 21 are provided on the distribution plate 19 .

[0046] Each chamber has a specific height and width and needs to be designed according to the range of movement of different particles so that particles of different sizes and densities can accurately fall into their respective target chambers. Generally speaking, particles with large size and high density always fall into the fluidized chamber close to the particle inlet pipe 13. As the particle size or density decreases, the distance the particles move in the horizontal direction increases, and they tend to fall into other chambers away from the particle outlet 20. Figure 3Each chamber is provided with a V-shaped sieve plate 6 at the top. The size of the sieve holes 17 of the V-shaped sieve plate 6 is set according to the target particle size of the fluidized chamber. The V-shaped sieve plate 6 can ensure the smooth falling of the particles while reducing the impact of the fluidizing air on the sorting process above the sieve plate. The V-shaped structure of the sieve plate can also improve the uniformity of the distribution of falling particles. Each fluidized chamber is provided with a number of heat exchange tubes 18. The heat exchange tubes 18 in each fluidized chamber are connected in series, and the heat exchange tubes in adjacent fluidized chambers are connected in parallel. The number of heat exchange tubes is determined according to the designed heat transfer load of each chamber. In order to improve the heat transfer coefficient between the particles and the tube wall, the diameter of the heat exchange tube 18 decreases accordingly as the particle size decreases. Therefore, the diameter of the heat exchange tube bundle in different fluidized chambers is different. The heat exchange medium in the heat exchange tube 18 can be selected according to the temperature of the particles. For example, when the particle temperature is high, supercritical carbon dioxide can be used as the heat exchange fluid, and when the temperature is low, water, heat transfer oil or organic medium can be used.

[0047] The sorting section 8 is located above the fluidizing section 5 (between the V-shaped screen plate 6 and the spoiler 11), separated from the fluidizing section 5 by the V-shaped screen plate 6. It mainly includes a particle inlet pipe 13, a roller 12, a nozzle array 15, and a spoiler 11. A nozzle air volume control valve 14 is located upstream of the nozzle array 15. The particle inlet pipe has a certain inclination angle to facilitate the particles' gravity drop. The inclination of the particle inlet pipe should be fixed, and the initial velocity of the particles can be adjusted by adjusting the roller speed; see [see "The particle inlet pipe has a certain inclination angle to facilitate the particles' gravity drop".] Figure 4In Figures (a) and (b), roller 12 is a cylindrical structure located at the end of the particle inlet pipe. A set of scrapers 23 are mounted at equal angles on it. A small gap (determined by the maximum particle size) is maintained between the top of the scrapers 23 and the wall of the particle inlet pipe. The roller 12 drives the scrapers 23 to rotate, creating a thin layer of particles through the rotary scraping action. The thin layer of particles leaving the inlet pipe flows into the separation zone in a waterfall-like manner. This thin layer of particles effectively reduces collisions and interference between particles during the separation process, improving the separation effect. The outer end of roller 12 is connected to a variable frequency motor 22 via a shaft. Adjusting the frequency of motor 22 controls the direction and speed of roller 12. The roller speed can be adjusted based on the particle size and density distribution of the wide-screened granular material. The nozzle array 15 is located below the particle inlet pipe 13 and consists of multiple high-speed gas nozzles. The high-speed airflow ejected by the nozzles acts evenly on the descending thin layer of particles. However, due to the different particle sizes and densities, the horizontal acceleration generated by the airflow also varies. Generally speaking, large-sized or high-density particles fall into the fluidized chamber near the particle inlet due to the small horizontal acceleration, while small-sized or low-density particles fall into the fluidized chamber far from the particle inlet due to the large horizontal acceleration, thus achieving effective screening of mixed particles. The jet speed and flow rate can be adjusted according to the particle size and density distribution of the mixed particles to ensure that all particles accurately fall into the target chamber. The spoiler 11 is located at the top of the sorting section 8, above the particle inlet. Its main function is to prevent particles from being directly carried away by the gas ejected from the nozzles, causing particles to short-circuit.

[0048] The width of the fluidization chamber is determined by the following process:

[0049] (1) Calculate the corresponding particle mass according to the size and density of different particles in the mixed particles. Assume that

[0050] The mixed particles are sieved into 4 particle size grades, d P ≥d P1 is the first particle size grade, d P1 >d P ≥d P2 For the second particle size grade, d P2 >d P ≥d P3 For the third particle size grade, d P <d P3 The fourth particle size grade; d P1 , d P2 , d P3 are the first design particle size, the second design particle size and the third design particle size respectively; d P is the mixed particle size;

[0051] The corresponding first particle mass, second particle mass and third particle mass are calculated according to the density of particles of each particle size and are represented by m1, m2 and m3 respectively.

[0052] (2) According to the site and heat load constraints, determine the total axial (width) size of each fluidized chamber, and determine the approximate ratio of the width of each chamber according to the designed particle size. There are four fluidized chambers, which are the first fluidized chamber, the second fluidized chamber, the third fluidized chamber, and the fourth fluidized chamber along the direction of particle movement. That is, the first fluidized chamber is close to the fluidizing air inlet 1. The width of the first fluidized chamber is L1, the width of the second fluidized chamber is L2, the width of the third fluidized chamber is L3, and the width of the fourth fluidized chamber is L4. If d P1 , d P2 , d P3 When the lengths of the fluidized bed are 2mm, 1mm, and 0.5mm, respectively, the widths of the chambers are roughly doubled, i.e., L3≈2L2≈4L1. The size of L4 is not an exact fixed value, but is determined based on the following two aspects: (1) The overall length of the fluidized bed: According to the actual application, the fluidized bed body has a specific length. Then, according to the sizes of dp1, dp2, and dp3, the sizes of L1, L2, and L3 are first determined. The size of L4 is equal to the total length minus (L1+L2+L3); (2) According to the content of the fourth particle size grade and the size of the particle size: The more the content of the particles with a particle size smaller than dp3 is, and the smaller the particle size, the larger L4 will be. Therefore, the size of L4 needs to be adjusted according to the actual application.

[0053] (3) Based on the initial design dimensions of each fluidizing chamber, the jet velocity and flow rate of the nozzle array 15 are adjusted. To simplify the analysis, it is assumed that the forces exerted by the airflow on the first, second, and third size class particles are F1, F2, and F3, respectively. According to Newton's second law F = m·a, the accelerations of the first, second, and third size class particles are a1 = F1 / m1, a2 = F2 / m2, and a3 = F3 / m3, respectively.

[0054] (4) Design a suitable fluidized chamber height so that the trajectory of each particle can fall within the target fluidized chamber range. Assuming that the heights of the V-shaped sieve plates at the top of the first, second, third, and fourth fluidized chambers from the particle inlet pipe are H1, H2, H3, and H4 respectively, according to the uniformly accelerated linear motion assumption, the falling time of the target particles in each fluidized chamber can be obtained as follows: Then the horizontal displacements of particles of different sizes (first size grade particles, second size grade particles, third size grade particles and fourth size grade particles) can be obtained as follows: Where v0 is the initial horizontal velocity of the particles after entering the fluidized bed.

[0055] (5) Compare the calculated horizontal displacements S1, S2, and S3 with the initial design widths L1, L2, and L3. If the two are not equal, adjust the jet velocity and flow rate to change the magnitude of the force acting on the particles, and recalculate the horizontal displacement according to the above steps until it is equal to the initial design width. That is, if the horizontal displacement of the first particle size grade particles is not equal to the width of the first fluidized chamber, the horizontal displacement of the second particle size grade particles is not equal to the width of the second fluidized chamber, and the horizontal displacement of the third particle size grade particles is not equal to the width of the third fluidized chamber, adjust the jet velocity and flow rate to change the magnitude of the force acting on the particles, and recalculate the horizontal displacement of the first particle size grade particles, the second particle size grade particles, and the third particle size grade particles until the horizontal displacement of the first particle size grade particles is equal to the width of the first fluidized chamber, the horizontal displacement of the second particle size grade particles is equal to the width of the second fluidized chamber, and the horizontal displacement of the third particle size grade particles is equal to the width of the third fluidized chamber.

[0056] The outlet section 9 is located at the top of the integrated device and is separated from the sorting section 8 by a spoiler 11. It is mainly used for collecting and discharging fluidized air. In order to reduce the mutual interference of fluidized air between chambers, each fluidized chamber has a separate fluidized air outlet.

[0057] A method for recovering and screening waste heat from high-temperature mixed particles based on the above-mentioned device comprises the following steps:

[0058] (1) Turn on the fan and gas heating device to guide the dry hot air with a certain temperature to the air distribution section 4 and the nozzle array 15 respectively, adjust the fluidizing air volume of each fluidizing chamber to a preset value, and adjust the opening of the control valve upstream of the nozzle to make the jet speed reach the preset value;

[0059] (2) Set the initial inclination angle of the particle inlet pipe, open the valve upstream of the particle inlet pipe 13, and let the particles fall by gravity in the inclined inlet pipe. Adjust the frequency of the variable frequency motor 22 to set the speed of the roller 12 so that the thin layer of particles flows evenly and smoothly into the sorting section 7, forming a waterfall.

[0060] (3) The thin layer of particles entering the sorting section 7 is screened by the horizontal jets ejected by the nozzle array 15. The particles with the largest particle size / density fall into the fluidized chamber close to the particle inlet. The farther the fluidized chamber is from the particle inlet, the smaller the particle size / density falls into it.

[0061] (4) The particles are screened into particles of different sizes by the sorting section 8, and then flow evenly into each fluidizing chamber through the V-shaped sieve plate 6. They are completely fluidized under the action of the fluidizing air. During the fluidization process, they exchange heat with the heat exchange pipes 18 in the chamber to complete the waste heat recovery.

[0062] (5) As the heat exchange process continues, the particle temperature gradually decreases. When the particle temperature drops to the lower limit temperature, the valve 20 at the particle outlet of each fluidized chamber is opened to discharge the low-temperature particles out of the system, and particles of different particle sizes are recycled and reused separately;

[0063] When the density of the incoming particles changes due to production processes or other reasons, it is necessary to adjust the nozzle air velocity or roller speed to ensure that the particles can accurately fall into the target fluidized chamber. The specific operation is as follows: when the particle mass increases (such as the density remains unchanged and the particle size increases, or the particle size remains unchanged and the density increases), it is necessary to increase the jet velocity to increase the acceleration of the horizontal movement of the particles to prevent the increase in particle mass from causing insufficient horizontal movement distance and ineffective screening; if necessary, reduce the roller speed to increase the particle falling time and initial horizontal velocity. When the particle mass decreases (such as the density remains unchanged and the particle size decreases, or the particle size remains unchanged and the density decreases), it is necessary to reduce the jet velocity to reduce the initial horizontal acceleration of the particles under the action of the airflow to prevent the horizontal movement distance from being too large and ineffective screening due to the decrease in particle mass; if necessary, the roller speed can also be increased to reduce the particle falling time and initial horizontal velocity.

[0064] During the heat exchange process, since the particle sizes in each chamber are different, the required fluidization wind speed is also different. Therefore, it is necessary to adjust the fluidization air volume and wind speed by controlling the opening of the fluidization air inlet valve of each chamber.

[0065] In the above process, the fluidized air that has undergone heat exchange flows out from the mixed gas outlet 10 and enters the cyclone separator to complete the separation of particles and gas. The separated gas is mixed with the low-temperature fresh air to increase the average temperature of the inlet fluidized air, thereby reducing the system energy consumption.

[0066] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0067] Following the above technical solution, Figure 1 As shown, the present invention provides four specific embodiments, corresponding to particles of different qualities (same particle size but different density) and their adjustment methods. The particle size range of the particles sorted by the present invention is given and is mainly divided into four levels: d ≥ 2mm, 1mm ≤ d < 2mm, 0.5mm ≤ d < 1mm, and d < 0.5mm.

[0068] Example 1: (Basic design)

[0069] Assuming that the lower limit of the fourth particle size grade is 0.3mm, the particle size range of the fourth particle size grade is 0.3mm≤d<0.5mm. The particle density is 2500kg / m 3The masses of particles with diameters of 2 mm, 1 mm, 0.5 mm, and 0.3 mm are 1.047×10 -5 kg, 1.309×10 -6 kg, 1.636×10 -7 kg, 3.534×10 -8 kg. Give the nozzle a certain amount of air so that the force exerted on the particles with a diameter of 2 mm reaches 2×10 -5 N, the force on the particle is proportional to the square of its particle size, so the forces on particles with a particle size of 1 mm, 0.5 mm, and 0.3 mm are 5×10 -6 N, 1.25×10 -6 N, 4.5×10 -7 N can be obtained that its horizontal acceleration is 1.91m / s 2 、3.82m / s 2 , 7.64m / s 2 、12.72m / s 2 The length of chamber I is L1, and its height from the particle inlet pipe 13 is H1. The length of chamber II is L2, and its height from the particle inlet pipe 13 is H2. The length of chamber III is L3, and its height from the particle inlet pipe 13 is H3. The length of chamber IV is L4, and its height from the particle inlet pipe 13 is H4. Initially, the speed of roller 12 is controlled by the variable frequency motor, so that the particles enter the sorting section 8 at an initial speed close to zero. Assuming H1 = 0.4m, L1 = 0.078m can be obtained. Assuming H2 = 0.5m, L2 = 0.195m can be obtained. Assuming H3 = 0.6m, L3 = 0.468m can be obtained. Assuming H4 = 0.7m, L4 = 0.909m can be obtained.

[0070] The relevant parameters of the particles are shown in Table 1:

[0071] Table 1 Related parameters of particles in Example 1

[0072]

[0073]

[0074] The method for recovering and screening waste heat of high-temperature mixed particles comprises the following steps:

[0075] (1) Turn on the fan and gas heating device, and let the dry hot air with a certain temperature flow from the fluidizing air inlet 1 through the air chamber 3 and the distribution plate 19 into each chamber. The amount of air flowing into each chamber can be controlled by the fluidizing air regulating valve 2 to reach the preset value;

[0076] (2) Open the nozzle air volume regulating valve 14 upstream of the nozzle array 15, and spray the heated dry hot air from the nozzle array 15 into the sorting section 8. Control the air volume so that the force acting on the particles with particle sizes of 2 mm, 1 mm, 0.5 mm, and 0.3 mm reaches 2×10 -5 N, 5×10 -6 N, 1.25×10 -6 N, 4.5×10 -7 N;

[0077] (3) The speed of the roller 12 is controlled by the variable frequency motor 22, so that the particles enter the separation section 8 at a low initial speed. The valve upstream of the particle inlet pipe 13 is opened, and the thin layer of particles flows into the separation section 8 evenly and smoothly through the action of the roller 12, forming a waterfall.

[0078] (4) After the particles flow into the separation section 8, they are separated under the action of the airflow. Particles with a particle size of d ≥ 2 mm fall into the fluidized chamber I. Their movement trajectory is roughly as follows Figure 1 The trajectory of medium and large particles is shown in 16. Particles with a particle size of 1≤d<2mm fall into the fluidized chamber II, particles with a particle size of 0.5≤d<1mm fall into the fluidized chamber III, and particles with a particle size of 0.3mm≤d<0.5mm fall into the fluidized chamber IV. Their movement trajectories are roughly as follows: Figure 1 As shown in the trajectory 7 of small and medium-sized particles, during the sorting process, the function of the spoiler 11 is to prevent the particles from being directly carried out by the gas ejected from the nozzle to avoid short circuit.

[0079] (5) The particles are sorted into particles of different sizes by the sorting section 8, and then flow evenly into each fluidizing chamber through the sieve holes 17 through the V-shaped sieve plate 6. They are completely fluidized under the action of the fluidizing air. During the fluidization process, they exchange heat with the heat exchange pipes 18 in the chamber to complete waste heat recovery.

[0080] (6) As the heat exchange process continues, the particle temperature gradually decreases. When the particle temperature drops to the lower limit temperature, the valve of the particle outlet 20 of each fluidized chamber is opened to discharge the low-temperature particles out of the system, and particles of different particle sizes are recycled and reused separately;

[0081] (7) In the above process, the fluidized air that has undergone heat exchange flows out from the mixed gas outlet 10 and enters the cyclone separator to separate the particles and the gas. The separated gas is filtered, purified, and cooled, and then mixed with another low-temperature fresh air through the induced draft fan to increase the average temperature of the fluidized air before entering the heat exchanger, which can play a role in energy recovery and utilization and reduce energy consumption.

[0082] (8) During the heat exchange process, since the particle sizes in each chamber are different, the required fluidizing air speed is also different. Therefore, it is necessary to adjust the fluidizing air volume and air speed by controlling the opening of the fluidizing air regulating valve 2 at the entrance of each chamber. Among them, since the particle sizes in chambers I, II, III, and IV decrease in sequence, the required fluidizing air volume also decreases in sequence. The fluidizing air volume required in chamber I is the largest, and the fluidizing air volume required in chamber IV is the smallest.

[0083] Example 2

[0084] When the particle density increases, assuming it is 2500kg / m 3 becomes 3000kg / m 3 , the mass of the particles changed and became 1.257×10 -5 kg, 1.571×10 -6 kg, 1.964×10 -7 kg, 4.241×10 -8 Without changing any other parameters, the accelerations of particles with diameters of 2 mm, 1 mm, 0.5 mm, and 0.3 mm are 1.59 m / s, respectively. 2 3.18m / s 2 、6.37m / s 2 、10.6m / s 2 , their horizontal movement distances are L1=0.065m<0.078m, L2=0.162m<0.195m, L3=0.39m<0.468m, L4=0.757m<0.909m. Therefore, when the particle density changes from 2500kg / m 3 Increased to 3000kg / m 3 Even if the air volume does not change, particles of different sizes can still fall into the corresponding fluidized chamber.

[0085] The relevant parameters of the particles are shown in Table 2:

[0086] Table 2 Related parameters of particles in Example 2

[0087] Particle size density quality Force / F Acceleration / a Vertical drop height / H Horizontal movement distance / L 2mm <![CDATA[3000kg / m 3 ]]> <![CDATA[1.257×10 -5 kg]]> <![CDATA[2×10 -5 N]]> <![CDATA[1.59m / s 2 ]]> 0.4m 0.065m 1mm <![CDATA[3000kg / m 3 ]]> <![CDATA[1.571×10 -6 kg]]> <![CDATA[5×10 -6 N]]> <![CDATA[3.18m / s 2 ]]> 0.5m 0.162m 0.5mm <![CDATA[3000kg / m 3 ]]> <![CDATA[1.964×10 -7 kg]]> <![CDATA[1.25×10 -6 N]]> <![CDATA[6.37m / s 2 ]]> 0.6m 0.39m 0.3mm <![CDATA[3000kg / m 3 ]]> <![CDATA[4.241×10 -8 kg]]> <![CDATA[4.5×10 -7 N]]> <![CDATA[10.6m / s 2 ]]> 0.7 0.757m

[0088] The method for recovering and screening waste heat of high-temperature mixed particles comprises the following steps:

[0089] (1) Turn on the fan and gas heating device, and let the dry hot air with a certain temperature flow from the fluidizing air inlet 1 through the air chamber 3 and the distribution plate 19 into each chamber. The amount of air flowing into each chamber can be controlled by the fluidizing air regulating valve 2 to reach the preset value;

[0090] (2) Open the control valve 14 upstream of the nozzle array 15 to spray the heated dry hot air from the nozzle array 15 into the separation section 8. Control the air volume so that the force exerted on the particles with a diameter of 2 mm, 1 mm, 0.5 mm, and 0.3 mm reaches 2×10 -5 N, 5×10 -6 N, 1.25×10 -6 N, 4.5×10 -7 N;

[0091] (3) The speed of the roller 12 is controlled by the variable frequency motor 22, so that the particles enter the separation section 8 at a low initial speed. The valve upstream of the particle inlet pipe 13 is opened, and the thin layer of particles flows into the separation section 8 evenly and smoothly through the action of the roller 12, forming a waterfall;

[0092] (4) After the particles flow into the separation section 8, they are separated under the action of the airflow. Particles with a particle size of d ≥ 2 mm fall into the fluidized chamber I. Their movement trajectory is roughly as follows Figure 1 The trajectory of medium and large particles is shown in 16. Particles with a particle size of 1≤d<2mm fall into the fluidized chamber II, particles with a particle size of 0.5≤d<1mm fall into the fluidized chamber III, and particles with a particle size of 0.3≤d<0.5mm fall into the fluidized chamber IV. Their movement trajectories are roughly as follows: Figure 1 As shown in the trajectory 7 of small and medium-sized particles, during the sorting process, the function of the spoiler 10 is to prevent the particles from being directly carried out by the gas ejected from the nozzle to avoid short circuit.

[0093] (5) The particles are sorted into particles of different sizes by the sorting section 8, and then flow evenly into each fluidizing chamber through the sieve holes 17 through the V-shaped sieve plate 6. They are completely fluidized under the action of the fluidizing air. During the fluidization process, they exchange heat with the heat exchange pipes 18 in the chamber to complete waste heat recovery.

[0094] (6) As the heat exchange process continues, the particle temperature gradually decreases. When the particle temperature drops to the lower limit temperature, the valve of the particle outlet 20 of each fluidized chamber is opened to discharge the low-temperature particles out of the system, and particles of different particle sizes are recycled and reused separately;

[0095] (7) In the above process, the fluidized air that has undergone heat exchange flows out from the mixed gas outlet 10 and enters the cyclone separator to separate the particles and the gas. The separated gas is filtered, purified, and cooled, and then mixed with another low-temperature fresh air through the induced draft fan to increase the average temperature of the fluidized air before entering the heat exchanger, which can play a role in energy recovery and utilization and reduce energy consumption.

[0096] (8) During the heat exchange process, since the particle sizes in each chamber are different, the required fluidizing air speed is also different. Therefore, it is necessary to adjust the fluidizing air volume and air speed by controlling the opening of the fluidizing air regulating valve 2 at the entrance of each chamber. Among them, since the particle sizes in chambers I, II, III, and IV decrease in sequence, the required fluidizing air volume also decreases in sequence. The fluidizing air volume required in chamber I is the largest, and the fluidizing air volume required in chamber IV is the smallest.

[0097] Example 3

[0098] When the particle density becomes smaller, assuming it is from 2500kg / m 3 becomes 2000kg / m 3 , the mass of the particles changed and became 8.378×10 -6 kg, 1.047×10 -6 kg, 1.309×10 -7 kg, 2.827×10 -8 Without changing any other parameters, the accelerations of particles with diameters of 2 mm, 1 mm, 0.5 mm, and 0.3 mm are 2.387 m / s respectively. 2 4.775m / s 2 , 9.549m / s 2 、15.903m / s 2 The horizontal movement distances are L1 = 0.097m > 0.078m, L2 = 0.244m > 0.195m, L3 = 0.585m > 0.468m, and L4 = 1.136m > 0.909m. At this time, particles of different particle sizes cannot fall into the corresponding fluidized chambers. Therefore, it is necessary to adjust the air volume to change the force acting on the particles, or adjust the motor frequency to control the speed of the roller 12 to change its initial speed, or combine the two to adjust so that particles of different particle sizes can fall into the corresponding chambers.

[0099] Adjust the nozzle air volume so that the force acting on the particles reaches 1.6×10 -5 N, 4×10 - 6 N, 1×10 -6 N, 3.597×10 -7 N, so the acceleration of particles with diameters of 2 mm, 1 mm, 0.5 mm, and 0.3 mm is 1.91 m / s respectively. 2 、3.82m / s 2 , 7.64m / s 2 、12.72m / s 2, their horizontal movement distances are L1 = 0.078m, L2 = 0.195m, L3 = 0.468m, and L4 = 0.909m respectively. Therefore, when the particle density decreases and its mass decreases, by reducing the size of the nozzle air volume, particles of different particle sizes can fall into the corresponding fluidized chamber.

[0100] The relevant parameters of the particles are shown in Table 3:

[0101] Table 3 Related parameters of particles in Example 1

[0102]

[0103]

[0104] The method for recovering and screening waste heat of high-temperature mixed particles comprises the following steps:

[0105] (1) Turn on the fan and gas heating device, and let the dry hot air with a certain temperature flow from the fluidizing air inlet 1 through the air chamber 3 and the distribution plate 19 into each chamber. The amount of air flowing into each chamber can be controlled by the fluidizing air regulating valve 2 to reach the preset value;

[0106] (2) Open the control valve 14 upstream of the nozzle array 15 to spray the heated dry hot air from the nozzle array into the separation section 8. Control the air volume so that the force exerted on the particles with a diameter of 2 mm, 1 mm, 0.5 mm, and 0.3 mm reaches 1.6×10 -5 N, 4×10 -6 N, 1×10 -6 N, 3.597×10 -7 N;

[0107] (3) The speed of the roller 12 is controlled by the variable frequency motor 22, so that the particles enter the separation section at a lower initial speed. The valve upstream of the particle inlet pipe 13 is opened, and the thin layer of particles flows evenly and smoothly into the separation section through the action of the roller 12, forming a waterfall.

[0108] (4) After the particles flow into the separation section, they are separated under the action of the airflow. Particles with a particle size of d ≥ 2 mm fall into the fluidized chamber I. Their movement trajectory is roughly as follows Figure 1 The trajectory of medium and large particles is shown in 16. Particles with a particle size of 1≤d<2mm fall into the fluidized chamber II, particles with a particle size of 0.5≤d<1mm fall into the fluidized chamber III, and particles with a particle size of 0.3≤d<0.5mm fall into the fluidized chamber IV. Their movement trajectories are roughly as follows: Figure 1 As shown in the trajectory 7 of small and medium-sized particles, during the sorting process, the function of the spoiler 10 is to prevent the particles from being directly carried out by the gas ejected from the nozzle to avoid short circuit.

[0109] (5) The particles are sorted into particles of different sizes by the sorting section, and then flow evenly into each fluidizing chamber through the sieve holes 17 through the V-shaped sieve plate 6. They are completely fluidized under the action of the fluidizing air. During the fluidization process, they exchange heat with the heat exchange pipes 18 in the chamber to complete waste heat recovery.

[0110] (6) As the heat exchange process continues, the particle temperature gradually decreases. When the particle temperature drops to the lower limit temperature, the valve of the particle outlet 20 of each fluidized chamber is opened to discharge the low-temperature particles out of the system, and particles of different particle sizes are recycled and reused separately;

[0111] (7) In the above process, the fluidized air that has undergone heat exchange flows out from the mixed gas outlet 10 and enters the cyclone separator to separate the particles and the gas. The separated gas is filtered, purified, and cooled, and then mixed with another low-temperature fresh air through the induced draft fan to increase the average temperature of the fluidized air before entering the heat exchanger, which can play a role in energy recovery and utilization and reduce energy consumption.

[0112] (8) During the heat exchange process, since the particle sizes in each chamber are different, the required fluidizing air speed is also different. Therefore, it is necessary to adjust the fluidizing air volume and air speed by controlling the opening of the fluidizing air regulating valve 2 at the entrance of each chamber. Among them, since the particle sizes in chambers I, II, III, and IV decrease in sequence, the required fluidizing air volume also decreases in sequence. The fluidizing air volume required in chamber I is the largest, and the fluidizing air volume required in chamber IV is the smallest.

[0113] Example 4

[0114] When the particle density becomes smaller, assuming it is from 2500kg / m 3 becomes 2000kg / m 3 , the mass of the particles changed and became 8.378×10 -6 kg, 1.047×10 -6 kg, 1.309×10 -7 kg, 2.827×10 -8 Without changing any other parameters, the accelerations of particles with diameters of 2 mm, 1 mm, 0.5 mm, and 0.3 mm are 2.387 m / s respectively. 2 4.775m / s 2 , 9.549m / s 2 、15.903m / s 2, their horizontal movement distances are L1 = 0.097m > 0.078m, L2 = 0.244m > 0.195m, L3 = 0.585m > 0.468m, and L4 = 1.136m > 0.909m. At this time, particles of different particle sizes cannot fall into the corresponding fluidized chambers. Therefore, it is necessary to adjust the air volume to change the force acting on the particles, or adjust the motor frequency to control the speed of the roller 12 to change its initial speed, or combine the two to adjust so that particles of different particle sizes can fall into the corresponding chambers.

[0115] Adjust the nozzle air volume so that the force acting on the particles reaches 1.2×10 -5 N, 3×10 - 6 N, 7.5×10 -7 N, 2.698×10 -7 N, at the same time, the motor frequency is adjusted to control the speed of the roller 12, so that the initial velocity of the particles v0 = 0.07m / s, so the acceleration of the particles with a diameter of 2mm, 1mm, 0.5mm, and 0.3mm are 1.43m / s respectively 2 , 2.86m / s 2 , 5.73m / s 2 , 9.54m / s 2 , their horizontal movement distances are L1 = 0.078m, L2 = 0.169m, L3 = 0.375m, and L4 = 0.708m. Therefore, when the particle density decreases and its mass decreases, by adjusting the nozzle air volume and the speed of the roller 12, particles of different particle sizes can still fall into the corresponding fluidized chamber.

[0116] The relevant parameters of the particles are shown in Table 4:

[0117] Table 4 Related parameters of particles in Example 4

[0118]

[0119] The implementation method is:

[0120] (1) Turn on the fan and gas heating device, and let the dry hot air with a certain temperature flow from the fluidizing air inlet 1 through the air chamber 3 and the distribution plate 19 into each chamber. The amount of air flowing into each chamber can be controlled by the fluidizing air regulating valve 2 to reach the preset value;

[0121] (2) Open the control valve 14 upstream of the nozzle array 15 to spray the heated dry hot air from the nozzle array into the separation section 8. Control the air volume so that the force exerted on the particles with a diameter of 2 mm, 1 mm, 0.5 mm, and 0.3 mm reaches 1.2×10 -5N, 3×10 -6 N, 7.5×10 -7 N, 2.698×10 -7 N;

[0122] (3) The speed of the roller 12 is controlled by the variable frequency motor 22, so that the particles enter the separation section at an initial speed of 0.07 m / s. The valve upstream of the particle inlet pipe 13 is opened, and the thin layer of particles flows evenly and smoothly into the separation section through the action of the roller 12, forming a waterfall;

[0123] (4) After the particles flow into the separation section, they are separated under the action of the airflow. Particles with a particle size of d ≥ 2 mm fall into the fluidized chamber I. Their movement trajectory is roughly as follows Figure 1 The trajectory of medium and large particles is shown in 16. Particles with a particle size of 1≤d<2mm fall into the fluidized chamber II, particles with a particle size of 0.5≤d<1mm fall into the fluidized chamber III, and particles with a particle size of 0.3≤d<0.5mm fall into the fluidized chamber IV. Their movement trajectories are roughly as follows: Figure 1 As shown in the trajectory 7 of small and medium-sized particles, during the sorting process, the function of the spoiler 10 is to prevent the particles from being directly carried out by the gas ejected from the nozzle to avoid short circuit.

[0124] (5) The particles are sorted into particles of different sizes by the sorting section, and then flow evenly into each fluidizing chamber through the sieve holes 17 through the V-shaped sieve plate 6. They are completely fluidized under the action of the fluidizing air. During the fluidization process, they exchange heat with the heat exchange pipes 18 in the chamber to complete waste heat recovery.

[0125] (6) As the heat exchange process continues, the particle temperature gradually decreases. When the particle temperature drops to the lower limit temperature, the valve of the particle outlet 20 of each fluidized chamber is opened to discharge the low-temperature particles out of the system, and particles of different particle sizes are recycled and reused separately;

[0126] (7) In the above process, the fluidized air that has undergone heat exchange flows out from the mixed gas outlet 10 and enters the cyclone separator to separate the particles and the gas. The separated gas is filtered, purified, and cooled, and then mixed with another low-temperature fresh air through the induced draft fan to increase the average temperature of the fluidized air before entering the heat exchanger, which can play a role in energy recovery and utilization and reduce energy consumption.

[0127] (8) During the heat exchange process, since the particle sizes in each chamber are different, the required fluidizing air speed is also different. Therefore, it is necessary to adjust the fluidizing air volume and air speed by controlling the opening of the fluidizing air regulating valve 2 at the entrance of each chamber. Among them, since the particle sizes in chambers I, II, III, and IV decrease in sequence, the required fluidizing air volume also decreases in sequence. The fluidizing air volume required in chamber I is the largest, and the fluidizing air volume required in chamber IV is the smallest.

Claims

1. A high-temperature mixed particle waste heat recovery and screening integrated device, characterized in that: It comprises a screening body, a gas distribution section (4), a fluidizing section (5), a sorting section (8) and an outlet section (9) which are connected in sequence from bottom to top in the cavity of the screening body; The fluidizing section (5) includes a plurality of fluidizing chambers, wherein a distribution plate (19) is provided at the bottom of the fluidizing chamber and a V-shaped sieve plate (6) is provided at the top. The fluidizing chambers are multiple independent fluidizing chambers and are arranged adjacent to each other. A plurality of heat exchange tubes (18) are provided in each fluidizing chamber. The sorting section (8) includes a particle inlet pipe (13) provided on the screening body, and a nozzle array (15) is provided below the particle inlet pipe (13); The width of the fluidization chamber is determined by the following process: There are four fluidized chambers, which are the first fluidized chamber, the second fluidized chamber, the third fluidized chamber and the fourth fluidized chamber along the direction of particle movement; The mixed particles are sieved into 4 particle size grades, d P ≥d P1 is the first particle size grade, d P1 >d P ≥d P2 For the second particle size grade, d P2 >d P ≥d P3 For the third particle size grade, d P <d P3 The fourth particle size grade; d P1 , d P2 , d P3 are the first design particle size, the second design particle size and the third design particle size respectively; d P is the mixed particle size; The width of the first fluidizing chamber is L1, the width of the second fluidizing chamber is L2, the width of the third fluidizing chamber is L3, and the width of the fourth fluidizing chamber is L4; When d P1 , d P2 , d P3 When the widths are 2 mm, 1 mm and 0.5 mm respectively, L3≈2L2≈4L1, where L1 is the width of the first fluidizing chamber, L2 is the width of the second fluidizing chamber, and L3 is the width of the third fluidizing chamber.

2. The high-temperature mixed particle waste heat recovery and screening integrated device according to claim 1, characterized in that: The air distribution section (4) includes a plurality of air chambers (3), wherein a fluidizing air inlet (1) is provided at the bottom end of each air chamber (3), and a fluidizing air regulating valve (2) is provided at the fluidizing air inlet (1).

3. The high-temperature mixed particle waste heat recovery and screening integrated device according to claim 2, characterized in that: The air chamber (3) has an inverted cone structure.

4. The high-temperature mixed particle waste heat recovery and screening integrated device according to claim 1, characterized in that: A particle outlet (20) is provided at the bottom of each fluidizing chamber.

5. The high-temperature mixed particle waste heat recovery and screening integrated device according to claim 1, characterized in that: The particle inlet pipe (13) is arranged at an angle, and a spoiler (11) is arranged above the outlet of the particle inlet pipe (13).

6. The high-temperature mixed particle waste heat recovery and screening integrated device according to claim 1, characterized in that: A rotating roller (12) is provided at the inner end of the particle inlet pipe (13).

7. The high-temperature mixed particle waste heat recovery and screening integrated device according to claim 6, characterized in that: The rotating roller (12) is a cylindrical structure; a group of scrapers (23) are installed on the rotating roller (12) at equal angle intervals; and the rotating roller (12) is connected to a variable frequency motor (22).

8. The high-temperature mixed particle waste heat recovery and screening integrated device according to claim 1, characterized in that: The height of the V-shaped sieve plate of each fluidized chamber from the particle inlet pipe (13) is determined by the following process: The horizontal displacements of the first, second, third, and fourth size grade particles are calculated using the following formulas: S1= S2= S3= S4= Where S1 is the horizontal displacement of particles of the first size class, S2 is the horizontal displacement of particles of the second size class, S3 is the horizontal displacement of particles of the third size class, S4 is the horizontal displacement of particles of the fourth size class, and v0 is the initial horizontal velocity of the particles after entering the fluidized bed; is the acceleration of the first size class particles, is the acceleration of the second size class particles, is the acceleration of the third size class particles, is the acceleration of the fourth size class particles, t1 is the falling time of the target particles in the first fluidized chamber, t2 is the falling time of the target particles in the second fluidized chamber, t3 is the falling time of the target particles in the third fluidized chamber, and t4 is the falling time of the target particles in the fourth fluidized chamber; Compare the horizontal displacement of the first particle size grade particles with the width of the first fluidizing chamber, the horizontal displacement of the second particle size grade particles with the width of the second fluidizing chamber, and the horizontal displacement of the third particle size grade particles with the width of the third fluidizing chamber. If the horizontal displacement of the first particle size grade particles with the width of the first fluidizing chamber, the horizontal displacement of the second particle size grade particles with the width of the second fluidizing chamber, and the horizontal displacement of the third particle size grade particles with the width of the third fluidizing chamber are not equal, adjust the jet speed and flow rate to change the magnitude of the force acting on the particles, and recalculate the horizontal displacements of the first particle size grade particles, the second particle size grade particles, and the third particle size grade particles until the horizontal displacement of the first particle size grade particles is equal to the width of the first fluidizing chamber, the horizontal displacement of the second particle size grade particles is equal to the width of the second fluidizing chamber, and the horizontal displacement of the third particle size grade particles is equal to the width of the third fluidizing chamber.

9. A waste heat recovery and screening method based on the high-temperature mixed particle waste heat recovery and screening integrated device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Dry hot air is sprayed into the fluidized chamber through the nozzle array (15), and the particles are uniformly flowed into the sorting section (7) through the particle inlet pipe (13). The thin layer of particles entering the sorting section (7) is screened by the horizontal jet ejected by the nozzle array (15), and the particles with the largest particle size or density fall into the fluidized chamber close to the particle inlet pipe; the particles are screened into particles of different particle sizes by the sorting section (8), and then flow into each fluidized chamber uniformly through the V-shaped sieve plate (6), and are completely fluidized under the action of the fluidizing wind. During the fluidization process, heat exchange is carried out with the heat exchange pipe (18) in the fluidized chamber to complete waste heat recovery.

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