Elutriator system for dense-phase conveying system

Abstract

The invention provides an elutriator system for a dense-phase conveying system. The elutriator system comprises a separation hopper, an accelerating air inlet chamber and an elutriator, the separation hopper is communicated with the tail end of the dense-phase conveying system; the top surface of the acceleration air inlet chamber is communicated with the bottom surface of the separation hopper; a buffer assembly is arranged in the acceleration air inlet chamber and comprises a supporting inner ring and a buffer baffle unit connected to the inner side of the supporting inner ring. The top face of the supporting inner ring is connected to the top face of the acceleration air inlet chamber, and the bottom face is suspended. The top surface of the elutriator is communicated with the bottom surface of the accelerated air inlet chamber; and the elutriator is communicated with the elutriation fan. When materials enter the accelerating air inlet chamber, the unstable state is converted into the stable state, so that the materials and accelerating air enter the elutriator according to a certain solid-gas ratio, reliable acceleration of the materials in the elutriator and efficient separation of dust and drawn wires are achieved, the materials cannot be carried at a tail gas outlet of the elutriator, and reliable operation of an elutriator system is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of dense phase pneumatic conveying systems in the petrochemical industry, and in particular relates to an elutriator system for a dense phase conveying system. Background Art

[0002] In order to reduce the wear of materials during the transportation process, the pneumatic conveying system of low-density polyethylene (LDPE) equipment usually adopts dense phase pneumatic conveying. During dense phase conveying, the material in the pipeline is plug flow, and there is a section of plug and a section of gas interval in the pipeline, which is a non-steady flow state. If the traditional structure type elutriator system (such as Figure 1 If the elutriator is directly connected to the dense phase conveying pipeline (as shown in the figure), the material will enter the elutriator system in a non-steady-state plug flow. In this way, the speed of the material inside the elutriator cannot be controlled, resulting in a decrease in the dust separation effect, or entrained material will appear at the dust outlet of the elutriator, which will seriously affect the elutriation effect.

[0003] In view of this, developing an elutriator system that can efficiently separate dust and wire drawing in a dense phase conveying system has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide a elutriator system for a dense phase conveying system, so that the feed of the elutriator is converted from a non-steady state to a steady state, thereby achieving efficient separation of dust and wire drawing in dense phase conveying and ensuring the separation effect of the elutriator in dense phase conveying.

[0005] The present invention is achieved through the following technical solutions:

[0006] The object of the present invention is to provide an elutriator system for a dense phase conveying system, comprising:

[0007] A separation hopper connected to the end of the dense phase conveying system;

[0008] An accelerating air inlet chamber, the top surface of which is connected to the bottom surface of the separation hopper; a buffer assembly is provided in the accelerating air inlet chamber, and the buffer assembly includes a supporting inner ring and a buffer baffle unit connected to the inner side of the supporting inner ring; wherein the top surface of the supporting inner ring is connected to the top surface of the accelerating air inlet chamber, and the bottom surface of the supporting inner ring is suspended;

[0009] The elutriator has a top surface connected to the bottom surface of the accelerating wind inlet chamber; the elutriator is connected to the elutriation fan.

[0010] In a preferred embodiment of the present invention, a tangential feed port of the separation hopper is provided on the side of the separation hopper, and the tangential feed port of the separation hopper is connected to the end of the dense phase conveying system.

[0011] In a preferred embodiment of the present invention, the buffer baffle unit comprises:

[0012] A first set of buffer baffles is disposed at the lower part of the supporting inner ring; it includes two buffer baffles which are at the same vertical height and are disposed opposite to each other; and

[0013] A second group of buffer baffles is arranged above the first group of buffer baffles; it includes a plurality of buffer baffles;

[0014] Wherein, the horizontal distance between the first end and the second end of the buffer baffle is smaller than the radius of the supporting inner ring.

[0015] In a preferred embodiment of the present invention, in the second group of buffer baffles, a plurality of the buffer baffles are staggeredly arranged on both sides of the supporting inner ring.

[0016] In a preferred embodiment of the present invention, in the vertical direction, the plurality of buffer baffles in the second group of buffer baffles are arranged at equal intervals.

[0017] In a preferred embodiment of the present invention, the angle between the buffer baffle and the vertical direction is 25 to 30 degrees.

[0018] In a preferred embodiment of the present invention, the accelerating wind inlet chamber is connected to an accelerating fan.

[0019] In a preferred embodiment of the present invention, the accelerating wind air inlet chamber is provided with an accelerating wind tangential air inlet, and the accelerating wind tangential air inlet is connected to the accelerating fan.

[0020] In a preferred embodiment of the present invention, the elutriator is provided with an accelerating annular slit, and the accelerating annular slit is connected to the bottom surface of the accelerating air inlet chamber.

[0021] In a preferred embodiment of the present invention, a separation annular gap connected to the acceleration annular gap is provided below the acceleration annular gap, and the diameter of the separation annular gap is larger than that of the acceleration annular gap; the separation annular gap is connected to the elutriation fan.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The elutriator system of the present invention is used for a dense phase conveying system and is installed at the end of the dense phase conveying system. When the material enters the elutriator system in a plug flow from the dense phase conveying system, the feed of the elutriator is changed from a non-steady state to a steady state, thereby ensuring that the material and the accelerating wind enter the elutriator at a certain solid-gas ratio, realizing reliable acceleration of the material inside the elutriator and efficient separation of dust and wire drawing, achieving the same separation effect as a traditional dilute phase conveying elutriator, and the tail gas outlet of the elutriator will not entrain the material, thereby ensuring the reliable operation of the elutriator system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of a dense phase conveying system and an elutriator system in the prior art;

[0025] Figure 2 It is a structural diagram of a dense phase conveying system and an elutriator system of the present invention;

[0026] Figure 3 It is a front view structural diagram of the separation hopper in the elutriator system of the present invention;

[0027] Figure 4 A top view of the separation hopper in the elutriator system of the present invention;

[0028] Figure 5 It is a main structural diagram of the accelerating air inlet chamber in the elutriator system of the present invention;

[0029] Figure 6 A top view of the structure of the accelerating air inlet chamber in the elutriator system of the present invention;

[0030] Figure 7 It is a main structural diagram of the elutriator in the elutriator system of the present invention;

[0031] In the figure, 1-raw material bin; 2-rotary valve; 3-dense phase conveying pipeline; 4-elutriator, 41-elutriator feed inlet, 42-elutriator discharge port, 43-elutriation air inlet, 44-elutriator tail gas outlet, 45-acceleration annular gap, 46-separation annular gap; 5-elutriation fan; 6-tail gas bag filter; 7-separation hopper, 71-separation hopper tangential feed inlet, 72-separation hopper exhaust port, 73-separation hopper discharge port; 8-gravity rotary valve; 9-acceleration air inlet chamber, 91-acceleration air inlet chamber feed inlet, 92-acceleration air tangential inlet, 93-acceleration air inlet chamber discharge port; 10-acceleration fan; 11-buffer baffle; 12-support inner ring. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0033] The present invention provides an elutriator system for a dense phase conveying system, which is installed at the end of the dense phase conveying system, such as Figure 2 As shown, the dense phase conveying system includes a raw material bin 1, a rotary valve 2 and a dense phase conveying pipeline 3. The material is stored in the raw material bin 1. By opening the rotary valve 2, the material can be transferred from the raw material bin 1 to the dense phase conveying pipeline 3, and a non-steady flow pattern is formed therein, and the material is conveyed to the right. Among them, the non-steady flow pattern is that a section of material plug and a section of gas section are separated and run. The elutriator system of the present invention is connected to the right end of the dense phase conveying pipeline 3.

[0034] The elutriator system of the present invention comprises an elutriator 4, an elutriation fan 5, an exhaust bag filter 6, a separation hopper 7, an accelerating air inlet chamber 9 and an accelerating fan 10. Specifically, the separation hopper 7 is connected to the right end of the conveying pipeline 3, and the non-steady-state fluid material enters the separation hopper 7 under the joint action of the compressor and the gas control unit in the dense phase conveying system.

[0035] The structure of the separation hopper 7 is as follows Figure 3 As shown. Figure 3 It can be seen that the separation hopper 7 is composed of two parts connected to each other, wherein the upper part is a hollow cylindrical structure and the lower part is a hollow cone structure, and the upper part is coaxially arranged with the lower part. The interior of the separation hopper 7 includes a separation hopper exhaust port 72 and a separation hopper discharge port 73; wherein the separation hopper exhaust port 72 and the separation hopper discharge port 73 are respectively arranged on the top surface and the bottom surface of the separation hopper 7.

[0036] Preferably, the side of the separation hopper 7 is provided with a separation hopper tangential feed port 71, which is arranged on the side of the upper part of the separation hopper 7 and is connected to the right end of the conveying pipe 3. The material enters the separation hopper 7 tangentially from the separation hopper tangential feed port 71 (such as Figure 4 As shown in the figure, the material with large inertial centrifugal force is thrown toward the inner wall of the separation hopper 7, while the gas phase part from the dense phase conveying system will not be thrown toward the inner wall of the separation hopper 7. In the feed from the dense phase conveying system, the gas phase part moves upward and turns out from the exhaust port 72 of the separation hopper, realizing the separation of the material and part of the dense phase conveying gas, but it is still impossible to realize the transformation from the non-steady state flow mode to the steady state mode.

[0037] In summary, the non-steady flow pattern realizes gas-solid separation in the separation hopper 7. After the gas-solid separation, part of the gas phase of the dense phase conveying system (i.e., tail gas) is transferred out of the separation hopper 7 through the separation hopper exhaust port 72 under the action of the gas conveying back pressure, and finally enters the tail gas bag filter 6 (the separation hopper exhaust port 72 is connected to the tail gas bag filter 6); the remaining part is transferred out of the separation hopper 7 through the separation hopper discharge port 73.

[0038] The separation hopper discharge port 73 is connected to the accelerating air inlet chamber 9, and a conventional rotary valve is arranged between the two. The conventional rotary valve needs to withstand a pressure of 0.5 barg. The material discharged from the separation hopper discharge port 73 enters the accelerating air inlet chamber 9 connected to the separation hopper 7. Preferably, the conventional rotary valve is a gravity rotary valve 8. The gravity rotary valve 8 is always kept in an open state.

[0039] like Figure 5As shown, the accelerated air inlet chamber 9 is composed of two parts connected to each other, wherein the upper part is a hollow cylindrical structure and the lower part is a hollow inverted truncated cone structure, and the upper and lower parts are coaxially arranged. The top surface of the accelerated air inlet chamber 9 is provided with an accelerated air inlet chamber feed port 91, the side wall is provided with an accelerated air inlet, and the bottom surface is provided with an accelerated air inlet chamber discharge port 93, and the material transferred from the separation hopper 7 enters from the accelerated air inlet chamber feed port 91.

[0040] A buffer assembly is provided inside the accelerated wind inlet chamber 9, and the buffer assembly includes a support inner ring 12 and a buffer baffle unit connected to the support inner ring 12. Specifically, the support inner ring 12 is annular and is coaxially arranged with the accelerated wind inlet chamber 9. The height of the support inner ring 12 is the same as the height of the cylindrical structure of the accelerated wind inlet chamber 9, and its top surface is connected to the top surface of the accelerated wind inlet chamber 9, and the bottom surface is suspended. From the inner side surface of the support inner ring 12, a plurality of buffer baffles 11 extend toward the axial direction of the accelerated wind inlet chamber 9, and the plurality of buffer baffles 11 together constitute a buffer baffle unit. The first end of the buffer baffle 11 is connected to the inner side surface of the support inner ring 12, and the second end is suspended. The height of the first end of the buffer baffle 11 in the vertical direction is greater than the height of the second end in the vertical direction. The horizontal distance between the first end and the second end of the buffer baffle 11 is less than the radius of the support inner ring 12.

[0041] In a preferred embodiment of the present invention, the buffer baffle unit is divided into two groups. The first group of buffer baffles is arranged at the lower part of the support inner ring 12, and includes two buffer baffles 11 at the same vertical height and arranged opposite to each other. The height of the second end of the first group of buffer baffles in the vertical direction is close to the height of the bottom surface of the support inner ring 12 in the vertical direction.

[0042] In this embodiment, the horizontal spacing between two relative buffer baffles 11 in the first group of buffer baffles is 100mm. The design of the horizontal spacing is obtained through test and summary. By testing the feeding capacity of polyolefin materials under different horizontal spacing sizes, the curve relationship between the horizontal spacing size and the material gravity feeding amount can be obtained. Combined with the capacity of dense phase conveying, a certain horizontal spacing is selected so that the theoretical gravity feeding capacity is slightly greater than the capacity of dense phase conveying. For example, the conveying capacity of the dense phase conveying system is 50t / h, and the gravity feeding capacity measured by the test under the condition of a horizontal spacing of 100mm is slightly greater than 50t / h.

[0043] It should be noted that the horizontal spacing between two relative buffer baffles 11 in the first group of buffer baffles is related to factors such as the design capacity of the upstream dense phase conveying system, conveying pressure, material plug length, and material plug frequency. Technical personnel can set the horizontal spacing between two relative buffer baffles 11 in the first group of buffer baffles according to actual conditions.

[0044] The second set of buffer baffles also includes a plurality of buffer baffles 11. The first end of the second set of buffer baffles has a vertical height higher than the first end of the first set of buffer baffles. The plurality of buffer baffles 11 of the second set of buffer baffles are staggered along both sides of the support inner ring 12. Figure 5 The second group of buffer baffles 11 is exemplarily shown to be arranged in a staggered manner. Figure 5 As shown, the number of the second group of buffer baffles is three, of which two buffer baffles 11 are arranged on the left side of the support inner ring 12, and the remaining buffer baffle 11 is arranged on the right side of the support inner ring 12. Moreover, in the vertical direction, the height of the buffer baffle 11 arranged on the right side of the support inner ring 12 is between the heights of the two buffer baffles 11 arranged on the left side of the support inner ring 12.

[0045] In a more preferred embodiment of the present invention, in the vertical direction, the plurality of buffer baffles 11 of the second group of buffer baffles are arranged at equal intervals. Figure 5 The second group of buffer baffles 11 is exemplarily shown to be arranged at equal intervals. Figure 5 As shown, in the vertical direction, the vertical distance between the two buffer baffles 11 arranged on the left side of the support inner ring 12 is equal to the vertical distance between the buffer baffles 11 arranged on the right side of the support inner ring 12. Specifically in this embodiment, the vertical distance between two adjacent buffer baffles 11 in the second group of buffer baffles is not less than 200mm. It should be noted that the vertical distance between two adjacent buffer baffles 11 is related to the design capacity, conveying pressure, plug length, plug frequency and other factors of the upstream dense phase conveying system. The technicians can set the vertical distance between two adjacent buffer baffles 11 according to the actual situation.

[0046] After the material passes through the five buffer baffles 11 for deflection and flow restriction, it enters the inverted truncated cone structure at the bottom of the accelerating air inlet chamber 9 evenly and continuously with a certain amount of material discharge. Specifically, the material entering the accelerating air inlet chamber 9 runs in a gap between a section of material plug and a section of gas. The first material to be contacted is the buffer baffle 11 in the second group of buffer baffles, which is located on the upper left side of the support inner ring 12. This limits the flow capacity of the material to a certain extent, reduces its speed, and reduces the spacing between the next section of the material plug; and under the guidance of the buffer baffle 11, the material changes its flow direction and flows to the right. Next, the material flows to the buffer baffle 11 in the second group of buffer baffles, which is located on the right side of the support inner ring 12, and then changes its flow direction again, flowing to the buffer baffle 11 in the second group of buffer baffles, which is located on the lower left side of the support inner ring 12. Such repeated changes in the flow direction of the material can, on the one hand, buffer the flow of the material, and on the other hand, ensure that there is material on the first group of buffer baffles and that the material is not piled up, and finally realize the conversion of "intermittent material" into "continuous material".

[0047] In this embodiment, the material is designed to be diverted three times, which is obtained based on the maximum material plug length, maximum material plug weight and material plug frequency that may appear in the upstream dense phase conveying system, combined with the material fluidity characteristics. The technicians can design a reasonable number of diversions based on the characteristics of the upstream dense phase conveying system and the material flow characteristics.

[0048] In a preferred embodiment of the present invention, the angle between the buffer baffle 11 and the vertical direction is 25 to 30 degrees. Specifically, the angle between the buffer baffle 11 and the vertical direction is designed based on the fluidity and friction angle characteristics of the material. A too large angle will easily lead to poor material flow, and a too small angle will make it difficult for the material to flow between the first group of buffer baffles, and the height of the equipment will also be increased.

[0049] It should be noted that Figure 5 The five buffer baffles 11 are only for exemplary description and do not constitute a limitation on the number of buffer baffles 11. In actual applications, technicians can set the number of buffer baffles 11, especially the number of the second group of buffer baffles, according to factors such as the design capacity of the upstream dense phase conveying system, conveying pressure, material plug length, and material plug frequency.

[0050] In summary, the material from the separation hopper discharge port 73 enters the accelerating air inlet chamber feed port 91 through the gravity rotary valve 8, and then enters the support inner ring 12 connected to the accelerating air inlet chamber feed port 91, and continues to move downward into the lower part of the accelerating air inlet chamber 9 after being deflected and limited by five buffer baffles 11.

[0051] In addition, an annular gap is formed between the inner support ring 12 and the inner side wall of the accelerating air inlet chamber 9, and the accelerating air inlet is arranged on the side of the accelerating air inlet chamber 9, so the accelerating air generated by the accelerating fan 10 enters the annular gap and enters the lower part of the accelerating air inlet chamber 9 after being evenly distributed. The material that also enters the lower part of the accelerating air inlet chamber 9 after passing through the five buffer baffles 11 is evenly mixed with the accelerating air in the lower part of the accelerating air inlet chamber 9, and then turns out from the accelerating air inlet chamber outlet 93. It should be emphasized that the inverted truncated cone structure of the accelerating air inlet chamber 9 is the contact and mixing place between the material and the accelerating air.

[0052] In a preferred embodiment of the present invention, the accelerating air inlet is an accelerating air tangential inlet 92, that is, the accelerating air enters the accelerating air inlet chamber 9 tangentially (e.g. Figure 6 As shown), centrifugal rotation is formed in the annular gap. After the centrifugal rotating accelerated wind enters the lower part of the accelerated wind inlet chamber 9, the accelerated wind and the material are mixed more evenly, which is beneficial to the uniform acceleration of the material.

[0053] The continuous material and the accelerating air flow are transferred out from the accelerating air inlet chamber outlet 93 and enter the elutriator 4 connected to the accelerating air inlet chamber 9. Figure 7As shown, the elutriator 4 includes four parts connected and coaxially arranged, which are respectively a hollow first cylindrical structure, a hollow second cylindrical structure, a hollow third cylindrical structure and a hollow cone structure from top to bottom. Among them, the inner diameters of the first cylindrical structure, the second cylindrical structure and the third cylindrical structure increase successively. The elutriator 4 is provided with an elutriator feed port 41 on the top surface, an elutriator discharge port 42 on the bottom surface, an elutriation air inlet 43 and an elutriation exhaust gas outlet 44 on the side. After the continuous material and the accelerating air are evenly mixed, they enter the elutriator 4 from the elutriator feed port 41.

[0054] An inner cone is provided at the axis of the first cylindrical structure, the second cylindrical structure and the third cylindrical structure in the elutriator 4, and the inner diameter of the inner cone is smaller than the inner diameter of the first cylindrical structure in the elutriator 4. The bottom end of the inner cone is connected to a horizontal member, and is connected to the inner wall of the elutriator 4 through the horizontal member. The side of the first cylindrical structure in the elutriator 4 extends downward into the second cylindrical structure in the elutriator 4, and an acceleration annular gap 45 is formed between the side of the first cylindrical structure in the elutriator 4 and the inner cone. The material and the accelerating wind in a continuous state enter the accelerating annular gap 45 from the elutriator feed port 41. Under the action of the accelerating wind, the material is also accelerated after passing through the accelerating annular gap 45 of a certain height. It should be noted that in the present embodiment, the horizontal member is a cross rib plate, which will not hinder the material from moving downward to the elutriator discharge port 42.

[0055] In the third cylindrical structure of the elutriator 4, a separation annular gap 46 is formed between the side of the third cylindrical structure of the elutriator 4 and the inner cone. The elutriation air inlet 43 is arranged on the side of the third cylindrical structure. The elutriation air inlet 43 is connected to the elutriation fan 5. The elutriation fan 5 is started, and the elutriation air enters the separation annular gap 46 from the elutriation air inlet 43, and the elutriation air moves upward with a certain air velocity. At the same time, under the action of gravity, the material (mixed with dust and wire drawing) also enters the separation annular gap 46 from the self-acceleration annular gap 45 with a certain speed. The two meet in countercurrent, and the relative speed is the sum of the speeds of the two. For example, the upward air velocity of the elutriation air is 15m / s, and the downward speed of the material (mixed with dust and wire drawing) is 35m / s, then the relative speed of the two is about 50m / s. Since the pulling force acting on the dust and wire drawing is in the square relationship of the relative air velocity, such a high relative speed realizes the complete separation of dust, wire drawing and material. The clean material after dust removal and wire drawing continues to move downward under the action of gravity and is finally transferred out from the elutriator outlet 42. The dust content in the final product is less than 50PPM, ensuring that the dense phase conveying elutriation system has the same separation effect as the dilute phase conveying.

[0056] It should be noted that the air velocity control of the accelerating air and the air velocity control of the elutriating air are both related to the particle density and diameter of the material, the height of the accelerating annular gap 45 and the height of the separating annular gap 46, and the technicians can make adjustments according to the actual material conditions.

[0057] In summary, the continuous material and the accelerating wind enter the elutriator 4 at a certain solid-gas ratio, and the continuous material is accelerated in the accelerating annular gap 45. After acceleration, the continuous material is fully contacted with the elutriation wind in the separation annular gap 46 in the reverse direction, and the dust and wire drawing with a low settling velocity are separated by the elutriation wind and enter the tail gas bag filter 6 through the elutriator tail gas outlet 44 (the elutriator tail gas outlet 44 is connected to the tail gas bag filter 6), and the elutriator tail gas outlet 44 will not carry the material; the clean material is transferred out from the elutriator discharge port 42, and the dust content in the final product is less than 50PPM, which ensures that the dense phase conveying elutriation system has the same separation effect as the dilute phase conveying.

[0058] Example 1

[0059] The elutriator system for dense phase conveying system of the present invention has been applied to the Qilu Branch of Sinopec, and specifically applied to the dense phase air flow conveying system of its PE device (250,000 tons / year) for producing polyethylene. After being processed by the elutriator system, the dust and wire drawing generated during the dense phase conveying process can be efficiently separated. According to the test, the dust content in the finished product is less than 50PPM.

[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0062] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. An elutriator system for a dense phase conveying system, Features: include: A separation hopper connected to the end of the dense phase conveying system; An accelerating air inlet chamber, the top surface of which is connected to the bottom surface of the separation hopper; a buffer assembly is provided in the accelerating air inlet chamber, and the buffer assembly includes a supporting inner ring and a buffer baffle unit connected to the inner side of the supporting inner ring; wherein the top surface of the supporting inner ring is connected to the top surface of the accelerating air inlet chamber, and the bottom surface of the supporting inner ring is suspended; The elutriator has a top surface connected to the bottom surface of the accelerating wind inlet chamber; the elutriator is connected to the elutriation fan.

2. The elutriator system according to claim 1, Features: A tangential feed port of the separation hopper is provided on the side of the separation hopper, and the tangential feed port of the separation hopper is connected to the end of the dense phase conveying system.

3. The elutriator system according to claim 1, Features: The buffer baffle unit comprises: A first set of buffer baffles is disposed at the lower part of the supporting inner ring; it includes two buffer baffles which are at the same vertical height and are disposed opposite to each other; and A second group of buffer baffles is arranged above the first group of buffer baffles; it includes a plurality of buffer baffles; Wherein, the horizontal distance between the first end and the second end of the buffer baffle is smaller than the radius of the supporting inner ring.

4. The elutriator system according to claim 3, Features: In the second group of buffer baffles, a plurality of the buffer baffles are staggeredly arranged on both sides of the supporting inner ring.

5. The elutriator system according to claim 3, Features: In the vertical direction, the plurality of buffer baffles in the second group of buffer baffles are arranged at equal intervals.

6. The elutriator system according to claim 3, Features: The included angle between the buffer baffle and the vertical direction is 25 to 30 degrees.

7. The elutriator system according to claim 1, Features: The accelerating wind inlet chamber is communicated with the accelerating fan.

8. The elutriator system according to claim 7, Features: The accelerating wind air inlet chamber is provided with an accelerating wind tangential air inlet, and the accelerating wind tangential air inlet is connected to the accelerating fan.

9. The elutriator system according to claim 1, Features: The elutriator is provided with an accelerating annular slit, and the accelerating annular slit is communicated with the bottom surface of the accelerating wind inlet chamber.

10. The elutriator system according to claim 9, Features: A separation annular gap is provided below the acceleration annular gap and is connected thereto. The diameter of the separation annular gap is larger than that of the acceleration annular gap. The separation annular gap is connected to the elutriation fan.

Images