Powder dispersing device and powder calcining and drying equipment

Abstract

A powder dispersing device and a powder calcining and drying equipment. The powder storage and dispersing device comprises: a vertical cylinder, which is provided with a first discharge port at the lower part, an exhaust port at the upper part, and a first communication port on the side wall; a gas supply pipeline, which is located outside the cylinder and communicates with the cylinder, and is arranged to form a forward spiral upward airflow in the cylinder by supplying gas into the cylinder; a powder supply pipeline, which is at least partially located in the cylinder and above the gas supply pipeline, and is arranged to supply powder into the cylinder; a guide impeller, which is located in the cylinder and between the gas supply pipeline and the powder supply pipeline, and is provided with a first guide part arranged to guide the powder to fall in a reverse spiral; and a powder collection pipeline, which is located outside the cylinder, and is provided with a feeding port at the upper part and a second discharge port at the lower part, the feeding port being located above the guide impeller and communicating with the first communication port. The powder dispersing device can better improve the dispersibility of the powder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gypsum board production equipment, and particularly relates to a powder dispersing device and a powder calcining and drying equipment. BACKGROUND

[0002] The wet powder of desulfurization gypsum (Ca2SO4﹒2H2O) contains about 15% free water, and is easy to form wet lumps (i.e. easy to be caked). In the indirect calcining process, the dry powder and the wet powder are generally mixed to reduce the water content of the powder, so as to improve the dispersibility of the powder. How to better improve the dispersibility of the powder is also a technical problem that the technical personnel in the field have been trying to solve. SUMMARY

[0003] The present application provides a powder dispersing device which can better improve the dispersibility of the powder.

[0004] The present application also provides a powder calcining and drying equipment.

[0005] The powder dispersing device provided by the embodiment of the present application comprises: a vertically arranged cylinder, which is provided with a first discharge port at the lower part, an exhaust port at the upper part, and a first communication port at the side wall; a gas supply pipeline, which is located outside the cylinder and communicates with the cylinder, and is arranged to form a forward spiral upward airflow in the cylinder by supplying gas into the cylinder; a powder supply pipeline, which is at least partially located in the cylinder and above the gas supply pipeline, and is arranged to supply powder into the cylinder; a guide impeller, which is located in the cylinder and between the gas supply pipeline and the powder supply pipeline, and is provided with a first guide part arranged to guide the powder to fall in a reverse spiral manner; and a powder collecting pipeline, which is located outside the cylinder, and is provided with a feeding port at the upper part and a second discharge port at the lower part, wherein the feeding port is located above the guide impeller and communicates with the first communication port.

[0006] In some example embodiments, the guide impeller is further provided with a second guide part arranged to guide the airflow to rise in a forward spiral manner.

[0007] In some example embodiments, the guide impeller comprises: an upper cone with a diameter gradually decreasing from bottom to top, the side surface of the upper cone is provided with first dispersing blades, and the first guide part is the first dispersing blades; and a lower cone with a diameter gradually decreasing from top to bottom, which is located below the upper cone and connected with the upper cone, the side surface of the lower cone is provided with second dispersing blades, and the second guide part is the second dispersing blades.

[0008] In some example embodiments, the first dispersion vane and the second dispersion vane are both three-dimensional flow vanes.

[0009] In some example embodiments, the gas supply pipeline comprises a main pipeline, a first branch pipeline and a second branch pipeline, an inlet of the first branch pipeline and an inlet of the second branch pipeline are both in communication with an outlet of the main pipeline, outlets of the first branch pipeline and the second branch pipeline are both spaced apart in a circumferential direction of the cylinder body and are both connected to the cylinder body sidewall in a tangential direction of the cylinder body sidewall.

[0010] In some example embodiments, the powder dispersion device further comprises a guide vane located in the cylinder body and above the guide impeller, the guide vane is arranged to guide the gas flow to ascend in a positive spiral direction.

[0011] In some example embodiments, the cylinder body comprises, from bottom to top, a powder dispersion section, a powder lifting section and a powder separation section, a lower portion of the powder dispersion section is provided with the first discharge port, an upper portion of the powder separation section is provided with the exhaust port, the gas supply pipeline is in communication with the powder dispersion section, the powder supply pipeline is at least partially located in the powder lifting section, the first communication port is located on a sidewall of the powder separation section, the guide impeller is located at a lower portion of the powder lifting section, and the guide vane is located at an upper portion of the powder lifting section.

[0012] In some example embodiments, a lower portion of the powder lifting section is provided with a first necking portion that tapers upwardly, and the first guide portion is located in the first necking portion.

[0013] In some example embodiments, an upper portion of the powder lifting section is provided with a broadening portion that widens upwardly, and the guide vane is located in the broadening portion.

[0014] In some example embodiments, an upper portion of the powder separation section is provided with a second necking portion that tapers upwardly, the exhaust port is located at an upper portion of the second necking portion, and the first communication port is located below the second necking portion.

[0015] In some example embodiments, the powder dispersion device further comprises a lower-opened collection cover located below the cylinder body, a top portion of the collection cover is provided with a second communication port and a third communication port, the first discharge port is in communication with the second communication port, and the second discharge port is in communication with the third communication port.

[0016] In some example embodiments, the powder dispersion device further comprises an exhaust dust collection mechanism located above the cylinder body and in communication with the exhaust port.

[0017] The powder calcination drying equipment provided by the embodiment of the present application comprises: the powder dispersing device in any of the above embodiments; a one-step calcinator in communication with the first discharge port and the second discharge port, configured to supply the gas discharged therefrom to the cylinder from the first discharge port; and a two-step calcinator in communication with the gas supply pipeline, configured to supply the gas discharged therefrom to the cylinder from the gas supply pipeline.

[0018] The technical scheme provided by the embodiment of the present application supplies the gas (such as normal-temperature air) from the gas supply pipeline to the cylinder, so that a forward helical upward airflow is formed in the cylinder, the powder supply pipeline supplies the powder into the cylinder, the powder falls onto the guide impeller under the action of gravity, the first guide portion guides the powder to fall downward in a reverse helical manner, the airflow rises in a forward helical manner and the powder falls in a reverse helical manner, and in the process of relative motion and intersection of the airflow and the powder, the powder is more fully blown away by the airflow, so that the dispersibility of the powder is better; finally, part of the powder moves downward under the action of gravity and flows out from the first discharge port, and the other part of the powder rises in a forward helical manner with the airflow and enters the powder collecting pipeline from the first communication port under the action of centrifugal force when reaching the position of the first communication port, and then flows out from the second discharge port, and the airflow reaching the upper portion of the cylinder flows out from the exhaust port.

[0019] Further, the one-step calcinator supplies the high-temperature gas discharged therefrom to the cylinder from the first discharge port, and the two-step calcinator supplies the high-temperature gas discharged therefrom to the cylinder from the gas supply pipeline, the two parts of the gas are mixed and rise in a forward helical manner in the cylinder under the driving of the high-temperature gas supplied into the cylinder by the two-step calcinator, the present scheme utilizes the high-temperature gas discharged by the one-step calcinator and the two-step calcinator to pre-dry the powder, and the powder is also more easily evaporated by the high-temperature gas due to being blown away by the high-temperature gas, so that the moisture content of the powder is lower and the dispersibility of the powder is better after passing through the cylinder.

[0020] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. Other advantages of the present application can be realized and attained by means of the instrumentalities and combinations particularly pointed out in the description and appended claims. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide an understanding of the present application, and are incorporated in and constitute a part of the specification, illustrate embodiments of the present application, and together with the description serve to explain the technical scheme of the present application, and do not constitute a limitation on the technical scheme of the present application.

[0022] Figure 1 The front view structural schematic diagram of the powder calcination drying equipment is described for an embodiment of the present application, and the two-step calcinator and the exhaust dust collecting mechanism are not shown;

[0023] Figure 2 The front view structural schematic diagram of the powder calcination drying equipment is described for an embodiment of the present application, and the two-step calcinator and the exhaust dust collecting mechanism are not shown; Figure 1The diagram shows a top view of the cross-sectional structure of the powder calcining and drying equipment.

[0024] The corresponding relationship between the reference numerals and component names is as follows:

[0025] 100 cylinder, 110 first discharge port, 120 exhaust port, 130 first connecting port, 140 powder dispersion section, 150 powder lifting section, 151 first necking portion, 152 flaring portion, 160 powder separation section, 161 second necking portion, 200 air supply pipeline, 210 main pipeline, 220 first branch pipeline, 230 second branch pipeline, 240 square-to-round connecting pipe, 300 powder supply pipeline, 400 guide impeller, 410 first guide part, 420 second guide part, 430 upper cone, 440 lower cone, 500 powder collection pipeline, 510 feed port, 520 second discharge port, 600 guide blades, 700 collection cover, 800 one-step calciner. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other in any manner.

[0027] The powder dispersing device provided by the embodiment of the present invention is as follows: Figure 1 and Figure 2 As shown, it includes: a vertical cylinder 100, a first discharge port 110 is provided at the lower part of the cylinder 100, an exhaust port 120 is provided at the upper part, and a first communication port 130 is provided on the side wall; an air supply pipeline 200, the air supply pipeline 200 is located outside the cylinder 100 and is connected to the cylinder 100, and the air supply pipeline 200 is configured to form a positive spiral rising airflow (i.e., spiral rising in the positive direction) in the cylinder 100 by supplying air into the cylinder 100; a powder supply pipeline 300, the powder supply pipeline 300 is at least partially located in the cylinder 100 and above the air supply pipeline 200, and the powder supply pipeline 300 is configured to supply air to the cylinder 100 into which powder is supplied; a guide impeller 400 fixed in the cylinder 100 and located between the air supply pipeline 200 and the powder supply pipeline 300, the guide impeller 400 having a first guide portion 410 configured to guide the powder to spirally fall in a reverse direction (i.e., spirally fall in a reverse direction); and a powder collection pipeline 500 located outside the cylinder 100, the powder collection pipeline 500 having a feed inlet 510 at its upper portion and a second discharge outlet 520 at its lower portion, the feed inlet 510 being located above the guide impeller 400 and communicating with the first communication port 130. The cross section of the cylinder 100 may be annular, and the central axis of the guide impeller 400 substantially coincides with the central axis of the cylinder 100.

[0028] The air supply pipeline 200 supplies air (such as normal temperature air) into the cylinder 100, so that the air flow in the cylinder 100 forms a positive spiral upward, the powder supply pipeline 300 supplies powder into the cylinder 100, the powder falls onto the guide impeller 400 under the action of gravity, the first guide part 410 guides the powder to fall in a reverse spiral, the air flow spirals upward positively and the powder falls in a reverse spiral, in the process of relative motion and intersection of the air flow and the powder, the powder will be more fully blown away by the air flow, so that the dispersibility of the powder is better; finally, part of the powder moves downward under the action of gravity and flows out from the first discharge port 110, another part of the powder spirals upward positively with the air flow and enters the powder collection pipeline 500 from the first communication port 130 under the action of centrifugal force when reaching the position of the first communication port 130, and then flows out from the second discharge port 520 under the action of gravity, the air flow reaching the upper part of the cylinder 100 flows out from the exhaust port 120.

[0029] The powder dispersing device is applied to a powder calcining and drying equipment, a one-step calciner 800 of the powder calcining and drying equipment is in communication with the first discharge port 110 and the second discharge port 520, and a two-step calciner of the powder calcining and drying equipment is in communication with the air supply pipeline 200, the one-step calciner 800 is used to supply the gas (high-temperature gas, temperature about 140 degrees Celsius) discharged therefrom to the cylinder 100 from the first discharge port 110, and the two-step calciner is used to supply the gas (high-temperature gas, temperature about 140 degrees Celsius) discharged therefrom to the cylinder 100 from the air supply pipeline 200. Under the driving of the high-temperature gas supplied into the cylinder 100 by the two-step calciner, the two parts of gas are mixed and spirals upward positively in the cylinder 100, the present scheme utilizes the high-temperature gas discharged by the one-step calciner 800 and the two-step calciner to pre-dry the powder, and the powder will also be more easily evaporated by the high-temperature gas due to being blown away by the high-temperature gas, so that the moisture content of the powder is lower and the dispersibility of the powder is better after passing through the cylinder 100. The powder flowing out from the first discharge port 110 and the powder flowing out from the second discharge port 520 all fall into the one-step calciner 800 to be calcined and dried.

[0030] In some examples, as shown in Figure 1 The guide impeller 400 is also provided with a second guide part 420, the second guide part 420 is located below the first guide part 410, and the second guide part 420 is arranged to guide the air flow to spiral upward positively, after the air flow passes through the second guide part 420, the speed of the air flow spiraling upward positively is improved (that is, the speed of the air flow passing through the second guide part 420 is improved), so that the air flow can better blow away the powder in the process of relative motion and intersection with the powder.

[0031] In some examples, as shown in Figure 1As shown, the guide impeller 400 includes: an upper cone 430 with a diameter gradually decreasing from bottom to top, a first dispersing blade is provided on the side of the upper cone 430, and the first guide portion 410 is the first dispersing blade, which guides the powder to spiral downward in the reverse direction; and a lower cone 440 with a diameter gradually decreasing from top to bottom, the lower cone 440 is located below the upper cone 430 and is connected to the upper cone 430, a second dispersing blade is provided on the side of the lower cone 440, and the second guide portion 420 is the second dispersing blade, which guides the airflow to spiral upward in the forward direction.

[0032] In some examples, such as Figure 1 and Figure 2 As shown, both the first and second dispersing blades are three-dimensional flow blades. In one embodiment, the side of the upper cone 430 has eight (or other number) three-dimensional flow blades, and the side of the lower cone 440 has eight (or other number) three-dimensional flow blades. The eight three-dimensional flow blades on the side of the upper cone 430 are spirally distributed at a 45-degree angle, and the eight three-dimensional flow blades on the side of the lower cone 440 are also spirally distributed at a 45-degree angle (or other angle). From bottom to top, the deflection direction of the eight three-dimensional flow blades on the side of the upper cone 430 is the same as the deflection direction of the eight three-dimensional flow blades on the side of the lower cone 440 (the eight three-dimensional flow blades on the side of the upper cone 430 deflect in a positive direction from bottom to top, while the eight three-dimensional flow blades on the side of the lower cone 440 deflect in a positive direction from bottom to top).

[0033] In some examples, such as Figure 1 and Figure 2As shown, the gas supply pipeline 200 includes a main pipeline 210, a first branch pipeline 220, and a second branch pipeline 230. The inlet of the first branch pipeline 220 and the inlet of the second branch pipeline 230 are both in communication with the outlet of the main pipeline 210. The inlet of the main pipeline 210 is configured to be in communication with the two-step calciner. The outlet of the first branch pipeline 220 and the outlet of the second branch pipeline 230 are spaced apart in the circumferential direction of the cylinder body 100 and are both connected to the side wall of the cylinder body 100 along the tangential direction of the side wall. The high-temperature gas discharged by the two-step calciner is supplied into the cylinder body 100 along the tangential direction of the side wall of the cylinder body 100 from the outlet of the first branch pipeline 220 and the outlet of the second branch pipeline 230, so as to realize the forward spiral rising of the high-temperature gas along the side wall of the cylinder body 100 in the cylinder body 100. In some embodiments, the outlet of the first branch pipeline 220 and the outlet of the second branch pipeline 230 are spaced apart by 180 degrees (or other degrees) in the circumferential direction of the cylinder body 100. The outlet of the first branch pipeline 220 discharges the gas in the forward direction, and the outlet of the second branch pipeline 230 also discharges the gas in the forward direction, so as to make the high-temperature gas rise in the forward spiral direction. Alternatively, from bottom to top, the forward direction is the clockwise direction, and the reverse direction is the counterclockwise direction; or alternatively, from bottom to top, the reverse direction is the clockwise direction, and the forward direction is the counterclockwise direction. The above can all achieve the purpose of the present application without deviating from the design idea of the present application, and thus will not be described herein again. All of the above should be within the protection scope of the present application. The outlet of the first branch pipeline 220 and the outlet of the second branch pipeline 230 are both connected to the side wall of the cylinder body 110 through a square-to-round connecting pipe 240.

[0034] In some example embodiments, as shown in Figure 1 As shown, the powder dispersing device further includes a guide vane 600 fixed in the cylinder body 100 and above the guide impeller 400. The guide vane 600 is configured to guide the gas flow to rise in the forward spiral direction. After passing through the guide vane 600, the speed of the gas flow rising in the forward spiral direction is improved (i.e., the speed of the gas flow passing through the guide vane 600 is improved).

[0035] In some embodiments, as shown in Figure 1 As shown, the guide vane 600 includes a plurality of guide vanes 600. The plurality of guide vanes 600 are sequentially arranged in the circumferential direction of the cylinder body 100. Each guide vane 600 is spirally distributed at an angle of 60 degrees (or other angles). From bottom to top, the deflection direction of the eight three-dimensional flow vanes on the side of the lower cone 440 is the same as the deflection direction of each guide vane 600 (i.e., the eight three-dimensional flow vanes on the side of the lower cone 440 and each guide vane 600 are deflected in the forward direction from bottom to top).

[0036] In some example embodiments, as shown in Figure 1As shown, the barrel 100 includes, from bottom to top, a powder dispersing section 140, a powder lifting section 150, and a powder separating section 160. The lower part of the powder dispersing section 140 is provided with a first discharge port 110, and the upper part of the powder separating section 160 is provided with an exhaust port 120. A gas supply pipeline 200 is located outside the powder dispersing section 140 and communicates with the powder dispersing section 140. A powder supply pipeline 300 has its lower end (outlet) located in the powder lifting section 150 and its upper end (inlet) located outside the powder lifting section 150. A first communication port 130 is located in the side wall of the powder separating section 160. A guide impeller 400 is located in the lower part of the powder lifting section 150, and a guide vane 600 is located in the upper part of the powder lifting section 150. The powder supply pipeline 300 is a bent pipeline, and the lower end (outlet) of the powder supply pipeline 300 is arranged vertically downward and directly above the guide impeller 400.

[0037] In some examples, as shown in FIG. 1, Figure 1 As shown, the lower part of the powder lifting section 150 is provided with a first necked portion 151 that tapers upward, and the first guide portion 410 is located in the first necked portion 151. The second guide portion 420 is located in the upper part of the powder dispersing section 140. The lower part of the powder lifting section 150 is designed to be reduced in diameter, so that the upward spiral speed of the gas flow entering the powder lifting section 150 is increased. In this way, the gas flow that spirals upward in the powder lifting section 150 is more likely to carry the powder upward, and the powder is also continuously dried by the gas flow (with a temperature of about 140 degrees Celsius) during the upward process.

[0038] In some examples, as shown in FIG. 1, Figure 1 As shown, the upper part of the powder lifting section 150 is provided with a broad mouthed portion 152 that widens upward, and the guide vane 600 is located in the broad mouthed portion 152. The upper part of the powder lifting section 150 is designed to be expanded in diameter, so that the upward spiral speed of the gas flow entering the powder separating section 160 is decreased. In this way, the time for the powder to pass through the powder separating section 160 is prolonged, which not only improves the drying effect of the powder, but also ensures that more powder enters the powder collection pipeline 500 from the first communication port 130 under the action of centrifugal force.

[0039] In some examples, as shown in FIG. 1, Figure 1 As shown, the upper part of the powder separating section 160 is provided with a second necked portion 161 that tapers upward, and the exhaust port 120 is located in the upper part of the second necked portion 161. The first communication port 130 is located below the second necked portion 161. The upper part of the powder separating section 160 is designed to be reduced in diameter, so that the upward spiral of the material along with the gas flow is blocked. In this way, more powder in the powder separating section 160 can enter the powder collection pipeline 500 from the first communication port 130 under the action of centrifugal force.

[0040] In some example embodiments, as shown in FIG. 1, Figure 1As shown, the powder dispersing device further comprises a lower open collecting cover 700, which is located below the barrel 100 and is installed on a one-step calcinator 800, the top of the collecting cover 700 is provided with a second communication port and a third communication port, the first discharge port 110 is communicated with the second communication port, and the second discharge port 520 is communicated with the third communication port. The powder flowing out of the first discharge port 110 finally falls into the one-step calcinator 800, and the powder flowing out of the second discharge port 520 also finally falls into the one-step calcinator 800.

[0041] In some example embodiments, the powder dispersing device further comprises an exhaust dust collection mechanism (not shown in the figure), which is located above the barrel 100 and is communicated with the exhaust port 120, in the process of exhausting the gas into the environment, the exhaust dust collection mechanism prevents the powder from being exhausted into the environment with the gas. It can be that the exhaust dust collection mechanism is provided as a bag dust collector.

[0042] As shown in Figure 2 and ​ As shown, the powder calcination and drying equipment provided by the embodiments of the present application comprises the powder dispersing device of any of the above embodiments, a one-step calcinator 800, which is communicated with the first discharge port 110 and the second discharge port 520, and is used for supplying the gas discharged therefrom to the barrel 100 from the first discharge port 110, and a two-step calcinator (not shown in the figure), which is communicated with the gas supply pipeline 200 and is used for supplying the gas discharged therefrom to the barrel 100 from the gas supply pipeline 200.

[0043] The powder calcination and drying equipment has all the advantages of the powder dispersing device provided by any of the above embodiments, which will not be repeated here.

[0044] In summary, the technical scheme provided by the embodiments of the present application supplies the gas (such as normal temperature air) into the barrel from the gas supply pipeline, so that the gas flow forms a positive spiral upward in the barrel, the powder supply pipeline supplies the powder into the barrel, the powder falls onto the guide impeller under the action of gravity, the first guide part guides the powder to fall in a reverse spiral, the gas flow spirals upward positively and the powder falls in a reverse spiral, in the process of relative motion and intersection of the gas flow and the powder, the powder is more fully blown away by the gas flow, so that the dispersibility of the powder is better, and finally, part of the powder moves downward under the action of gravity and flows out of the first discharge port, another part of the powder spirals upward positively with the gas flow and enters the powder collecting pipeline from the first communication port under the action of centrifugal force when reaching the position of the first communication port, and then flows out of the second discharge port, and the gas flow reaching the upper part of the barrel flows out of the exhaust port.

[0045] Further, the high-temperature gas discharged by the one-step calciner is supplied to the cylinder from the first discharge port, and the high-temperature gas discharged by the two-step calciner is supplied to the cylinder from the gas supply pipeline, and the two gases are mixed and positively spirally ascend in the cylinder under the driving of the high-temperature gas supplied to the cylinder by the two-step calciner, and the present scheme utilizes the high-temperature gases discharged by the one-step calciner and the two-step calciner to pre-dry the powder, and the powder is more easily evaporated by the high-temperature gas due to being blown by the high-temperature gas, so that the moisture content of the powder is lower and the dispersibility is better after passing through the cylinder.

[0046] In the description in the present application, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "edge", "opposite", "four corners", "periphery", "mouth structure" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the structure referred to has a particular orientation, is constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0047] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", "assembly" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; the terms "installation", "connection", "fixed connection" can be directly connected, or indirectly connected through an intermediate medium, or the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] Although the embodiments disclosed by the present application are as above, the content described is only the embodiments adopted for the convenience of understanding the present application, and is not intended to limit the present application. It should be noted that the above examples or embodiments are only exemplary and not limiting. Therefore, the present disclosure is not limited to the specific embodiments shown and described herein. Various modifications, substitutions or omissions can be made to the forms and details without departing from the scope of the present disclosure.

Claims

1. A powder dispersing device, characterized in that: include: The vertical cylinder has a first discharge port at the bottom, an exhaust port at the top, and a first communication port on the side wall; an air supply pipeline located outside the cylinder and in communication with the cylinder, the air supply pipeline being configured to supply air into the cylinder so as to form a positive spiral upward airflow in the cylinder; a powder supply pipeline, at least partially located in the cylinder and above the air supply pipeline, the powder supply pipeline being configured to supply powder into the cylinder; a guide impeller located in the cylinder and between the air supply pipeline and the powder supply pipeline, the guide impeller being provided with a first guide portion configured to guide the powder to spirally fall in a reverse direction; and a powder collecting pipeline, located outside the cylinder, with a feed port provided at the upper portion of the powder collecting pipeline and a second discharge port provided at the lower portion, the feed port being located above the guide impeller and communicating with the first communication port; The guide impeller is further provided with a second guide portion, which is located below the first guide portion and is configured to guide the airflow to rise in a positive spiral direction.

2. The powder dispersing device according to claim 1, characterized in that: The guide impeller comprises: an upper cone with a diameter gradually decreasing from bottom to top, wherein a first dispersion blade is provided on a side surface of the upper cone, and the first guide portion is the first dispersion blade; and The lower cone, whose diameter gradually decreases from top to bottom, is located below the upper cone and connected to the upper cone. The side of the lower cone is provided with a second dispersing blade, and the second guide part is the second dispersing blade.

3. The powder dispersing device according to claim 2, characterized in that: The first dispersing blade and the second dispersing blade are both three-dimensional flow blades.

4. The powder dispersing device according to claim 1, characterized in that: The air supply pipeline includes a main pipeline, a first branch pipeline and a second branch pipeline. The inlet of the first branch pipeline and the inlet of the second branch pipeline are both connected to the outlet of the main pipeline. The outlet of the first branch pipeline and the outlet of the second branch pipeline are spaced apart in the circumferential direction of the cylinder and are both connected to the side wall of the cylinder along the tangent direction of the side wall of the cylinder.

5. The powder dispersing device according to any one of claims 1 to 4, characterized in that: Also includes: The guide blades are located in the cylinder and above the guide impeller, and the guide blades are configured to guide the airflow to perform positive spiral ascent.

6. The powder dispersing device according to claim 5, characterized in that: The cylinder includes a powder dispersion section, a powder lifting section and a powder separation section which are sequentially connected from bottom to top. The lower part of the powder dispersion section is provided with the first discharge port, the upper part of the powder separation section is provided with the exhaust port, the air supply pipeline is connected with the powder dispersion section, the powder supply pipeline is at least partially located in the powder lifting section, the first communication port is located on the side wall of the powder separation section, the guide impeller is located at the lower part of the powder lifting section, and the guide blade is located at the upper part of the powder lifting section.

7. The powder dispersing device according to claim 6, characterized in that: The lower part of the powder lifting section is provided with a first necking portion which gradually shrinks from bottom to top, and the first guide portion is located in the first necking portion; The upper portion of the powder lifting section is provided with a wide opening portion that gradually widens from bottom to top, and the guide blades are located in the wide opening portion; A second necking portion that gradually shrinks from bottom to top is provided on the upper portion of the powder separation section, the exhaust port is located above the second necking portion, and the first communication port is located below the second necking portion.

8. The powder dispersing device according to any one of claims 1 to 4, characterized in that: Also includes: A collecting cover with an opening at the bottom is located below the cylinder, and a second communicating port and a third communicating port are provided on the top of the collecting cover, the first discharge port is connected to the second communicating port, and the second discharge port is connected to the third communicating port; The exhaust and dust collecting mechanism is located above the cylinder and is communicated with the exhaust port.

9. A powder calcining and drying device, characterized in that: include: The powder dispersing device according to any one of claims 1 to 8; a one-step calciner, connected to both the first discharge port and the second discharge port, for supplying the discharged gas from the first discharge port to the cylinder; and The two-step calciner is connected to the gas supply pipeline and is used to supply the gas discharged from the two-step calciner to the cylinder through the gas supply pipeline.

Images