Direct-current cyclone separator

Abstract

The invention relates to the technical field of gas-solid and gas-liquid heterogeneous separation, and discloses a direct-current cyclone separator which comprises a barrel (1), a gas inlet (11) and a gas outlet (12) are formed in the two ends of the barrel (1) respectively, the direct-current cyclone separator further comprises an inner barrel (2), the inner barrel (2) is concentrically arranged in the barrel (1) in a sleeved mode, an annular channel is formed between the inner barrel (2) and the barrel (1), and the inner barrel (2) is arranged in the barrel (1) in a sleeved mode. And a cylinder cavity of the inner cylinder (2) and the annular channel are communicated with the air inlet (11), so that rotational flow formed by to-be-separated gas entering from the air inlet respectively passes through the cylinder cavity of the inner cylinder and the annular channel to be screwed into the exhaust port. According to the invention, the inner cylinder is arranged in the cylinder body, so that the movement distance of impurities reaching a side wall boundary layer can be shortened, and meanwhile, the impurity separation and trapping surface is increased, so that the impurities are more easily trapped, the separation efficiency is improved, and meanwhile, the separator is ensured to have lower pressure drop.

Description

Technical Field

[0001] The present invention relates to the technical field of gas-solid and gas-liquid heterogeneous separation, and particularly to a direct-current cyclone separator. Background Art

[0002] A cyclone separator is a device that uses the centrifugal force generated by the rotation of an air flow to separate solid particles (liquid droplets) from the air flow. It has a simple structure, low cost, convenient use, and a wide range of applications. It can operate stably for a long period under harsh environments such as high temperature, high pressure, and corrosion, and is widely used in many fields such as petroleum, chemical industry, and environment.

[0003] Common cyclone separators mainly have two types: reverse flow and direct current. Usually, the reverse-flow cyclone separator has high separation efficiency and high pressure drop, that is, high efficiency and high resistance. High resistance means that more energy needs to be consumed, which is not conducive to energy-saving applications. The direct-current cyclone separator has a low pressure drop and low energy consumption, but its separation efficiency is also low, that is, low resistance and low efficiency. In applications, it often cannot meet the requirements for separation efficiency. Therefore, the separation efficiency of the direct-current cyclone separator needs to be improved urgently. Summary of the Invention

[0004] The object of the present invention is to solve the problem of low separation efficiency of the existing direct-current cyclone separator.

[0005] To achieve the above object, the present invention provides a direct-current cyclone separator, including a cylinder body. An air inlet and an exhaust port are respectively arranged at two ends of the cylinder body. The direct-current cyclone separator further includes an inner cylinder, which is concentrically sleeved in the cylinder body and forms an annular channel between the inner cylinder and the cylinder body. The cavity of the inner cylinder and the annular channel are both communicated with the air inlet, so that the swirling flow formed by the gas to be separated entering from the air inlet respectively spirals into the exhaust port through the cavity of the inner cylinder and the annular channel.

[0006] In some embodiments, a plurality of first slit holes are spaced apart on the cylinder wall of the inner cylinder.

[0007] In some embodiments, the plurality of first slit holes are arranged in a spiral shape along the axial direction of the inner cylinder.

[0008] In some embodiments, the first slit hole is a long strip-shaped hole extending along the axial direction of the inner cylinder.

[0009] In some embodiments, a discharge port is further arranged at one end of the cylinder body.

[0010] In some embodiments, the direct-current cyclone separator further includes a flow guide body, which is concentrically arranged in the cylinder body and is arranged to extend from the upstream side to the downstream side of the air inlet. The outer diameter of the flow guide body is smaller than the inner diameter of the inner cylinder.

[0011] In some embodiments, the downstream end of the fluid guide is located upstream of the inner cylinder or extends up to the downstream end of the cylinder body.

[0012] In some embodiments, the fluid guide includes a cylindrical section and a conical section that are connected in sequence from upstream to downstream and have a gradually decreasing outer diameter. The outer diameter of the cylindrical section is 0.1 - 0.5 times the inner diameter of the inner cylinder.

[0013] In some embodiments, the air inlet is provided on the cylinder wall of the cylinder body and is arranged such that gas enters tangentially along the cylinder body. The downstream end of the fluid guide is located downstream of the air inlet.

[0014] In some embodiments, the height of the fluid guide is 1 - 3 times the height of the air inlet.

[0015] In some embodiments, the fluid guide is connected to the cylinder body through a connection assembly.

[0016] In some embodiments, the connection assembly includes a plurality of connecting guide vanes. Each connecting guide vane extends from the outer peripheral surface of the fluid guide radially to the inner peripheral surface of the cylinder body, and the plurality of connecting guide vanes are evenly spaced circumferentially along the fluid guide.

[0017] In some embodiments, one end of the cylinder body corresponding to the exhaust port is provided with an end cover. The downstream end of the inner cylinder is connected to the end cover, and a first cut is formed on the downstream cylinder wall of the inner cylinder, and the first cut communicates with the exhaust port.

[0018] In some embodiments, the direct current cyclone separator further includes at least one inner sleeve concentrically sleeved inside the inner cylinder. There are annular channels between the inner sleeves and between the inner sleeve and the inner cylinder.

[0019] In some embodiments, a plurality of second slit holes are spaced apart on the cylinder wall of the inner sleeve.

[0020] In some embodiments, the downstream end of the inner sleeve is connected to the end cover, and a second cut is formed on the downstream cylinder wall of the inner sleeve, and the second cut corresponds and communicates with the first cut.

[0021] In some embodiments, the exhaust port is provided on the cylinder wall of the cylinder body and is arranged such that gas is discharged tangentially along the cylinder body. The positions of the first cut and the second cut correspond to the exhaust port.

[0022] In some embodiments, the exhaust port is formed on the end cover, and the direct current cyclone separator further includes an exhaust pipe passing through the exhaust port.

[0023] In some embodiments, exhaust holes are formed in the tube wall of the exhaust pipe extending into the cylinder body.

[0024] Through the above technical solution, by arranging an inner cylinder in the cylinder body, the present invention can shorten the movement distance of impurities to the boundary layer of the side wall, and at the same time increase the impurity separation and capture surface, making it easier to capture impurities, thereby improving the separation efficiency and ensuring that the separator has a lower pressure drop.

[0025] Other features and advantages of the present invention will be described in detail in the subsequent specific embodiment part. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0027] Figure 1 is a schematic structural diagram of an embodiment of a direct current cyclone separator in the present invention;

[0028] Figure 2 is Figure 1 the A-A cross-sectional view in;

[0029] Figure 3 is Figure 1 the longitudinal sectional view of the flow guide in;

[0030] Figure 4 is Figure 1 the partial top view of the flow guide in;

[0031] Figure 5 is a schematic structural diagram of another embodiment of a direct current cyclone separator in the present invention;

[0032] Figure 6 is Figure 5 the B-B cross-sectional view in;

[0033] Figure 7 is Figure 5 the C-C cross-sectional view in;

[0034] Figure 8 is a schematic structural diagram of yet another embodiment of a direct current cyclone separator in the present invention;

[0035] Figure 9 is Figure 8 the cross-sectional view of the direct current cyclone separator in;

[0036] DESCRIPTION OF THE REFERENCE NUMERALS

[0037] 1 - Cylinder body, 11 - Air inlet, 12 - Exhaust port, 13 - End cover, 2 - Inner cylinder, 21 - First slit hole, 22 - First incision, 3 - Flow guide body, 31 - Cylindrical section, 32 - Conical section, 33 - Connecting guide vane, 4 - Inner sleeve, 41 - Second slit hole, 42 - Second incision, 5 - Exhaust pipe, 51 - Exhaust hole, 6 - Hopper, 61 - Discharge port. Specific embodiments

[0038] The following further describes the embodiments of the present invention in conjunction with the accompanying drawings. The detailed description and drawings of the following embodiments are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention. The present invention can be implemented in many different forms, not limited to the specific embodiments disclosed in the text, but including all technical solutions falling within the scope of the claims.

[0039] These embodiments of the present invention are provided to make the present invention thorough and complete, and to fully convey the scope of the present invention to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the components of materials, numerical expressions and values described in these embodiments should be construed as merely exemplary, rather than as limitations.

[0040] It should be noted that in the description of the present invention, unless otherwise specified, the meaning of "a plurality" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or positional relationship only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0041] In addition, the "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. The terms "including" or "comprising" and similar terms mean that the elements before the term cover the elements listed after the term, and do not exclude the possibility of also covering other elements.

[0042] It should also be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. When it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0043] All terms used in the present invention have the same meanings as those understood by those of ordinary skill in the art to which the present invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0044] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the specification.

[0045] In the present invention, the upstream and downstream are defined according to the flow direction of the gas in the direct current cyclone separator.

[0046] The present invention provides a direct current cyclone separator, which includes a cylinder body 1. An air inlet 11 and an exhaust port 12 are respectively arranged at two ends of the cylinder body 1. The direct current cyclone separator further includes an inner cylinder 2. The inner cylinder 2 is concentrically sleeved inside the cylinder body 1 and forms an annular channel with the cylinder body 1. The cavity of the inner cylinder 2 and the annular channel are both communicated with the air inlet 11, so that the swirling flow formed by the gas to be separated entering from the air inlet 11 respectively spirals into the exhaust port 12 through the cavity of the inner cylinder 2 and the annular channel.

[0047] In the above, it should be noted that the gas to be separated can form a swirling flow when passing through the air inlet 11 through the design of the air inlet 11 (for example, the air inlet 11 is designed as a tangential air inlet to be introduced below), or a swirling structure (which is an existing structure) can be arranged near the air inlet 11 to make the gas to be separated form a swirling flow.

[0048] The working principle of the DC cyclone separator of the present invention is as follows: The gas to be separated containing impurities (solid particles or droplets) enters the cylinder body 1 from the air inlet 11 to form a swirl. The swirl advances and enters the cavity of the inner cylinder 2 and the annular channel between the cylinder body 1 and the inner cylinder 2, and spirally advances along the cavity and the annular channel until it leaves the separator from the exhaust port 12; during the forward movement of the swirl, the impurities therein move along a spiral path towards the side walls of the cylinder body 1 and the inner cylinder 2 under the action of centrifugal force generated by the gas rotation, etc., until they enter the gas boundary layer on the walls of the cylinder body 1 and the inner cylinder 2, and then settle in the gas boundary layer and are separated from the gas flow. By arranging the inner cylinder 2 in the cylinder body 1, the present invention can shorten the movement distance of the impurities to the side wall boundary layer, and at the same time increase the impurity separation and capture surface, making it easier for the impurities to be captured, thereby improving the separation efficiency and ensuring that the separator has a lower pressure drop.

[0049] Wherein, the inner diameter of the inner cylinder 2 can be 0.3 to 0.9 times the inner diameter of the cylinder body 1, for example, 0.6 times.

[0050] In some embodiments, referring to Figure 1 , a plurality of first slit holes 21 are spaced apart on the cylinder wall of the inner cylinder 2. The impurities can enter the annular channel between the cylinder body 1 and the inner cylinder 2 through the first slit holes 21 and be discharged downward. The first slit holes 21 can timely discharge the impurities transported to the side wall of the inner cylinder, reduce the backmixing and entrainment of the impurities on the side wall of the inner cylinder, and further improve the separation efficiency. Among them, the "slit hole" can be understood as a long strip-shaped slit hole, that is, the length is much larger than the width (for example, the length is 20 mm and the width is 4 mm). For example Figure 1 As shown, the first slit holes 21 are long strip-shaped holes extending along the axial direction of the inner cylinder 2. The plurality of first slit holes 21 can be arranged in any manner. Preferably, the plurality of first slit holes 21 are arranged in a spiral shape along the axial direction of the inner cylinder 2. Specifically, as Figure 1 shown, the plurality of first slit holes 21 are arranged at equal intervals along the spiral line trajectory of the gas rotation.

[0051] The DC cyclone separator of the present invention may further include a flow guide body 3. The flow guide body 3 is concentrically arranged in the cylinder body 1 and is arranged to extend from the upstream side to the downstream side of the air inlet 11. The outer diameter of the flow guide body 3 is smaller than the inner diameter of the inner cylinder 2. By arranging the flow guide body 3, the flow guide body 3 can stabilize the gas flow entering the cylinder body, regularize the flow field, reduce the turbulent loss, and thus reduce the resistance drop. It should be noted that although the inner cylinder 2 increases the friction area between the gas flow and the wall surface, which will increase the frictional resistance, through the guidance and strengthening of the swirl by the flow guide body 3, the flow field is more regular and stable, the turbulent loss is reduced, the resistance can be reduced and the separation efficiency of the impurities can be increased. As a result, the overall resistance of the separator changes very little while the separation efficiency increases significantly.

[0052] In the present invention, the extension length of the fluid guide 3 is not limited. For example, in some embodiments, the downstream end of the fluid guide 3 is located upstream of the inner cylinder 2. For example Figure 1 As shown, the gas flow direction is from bottom to top. The top end (i.e., the downstream end) of the fluid guide 3 is located below the bottom end (i.e., the upstream end) of the inner cylinder 2 and above the top end (i.e., the downstream side) of the air inlet 11. In this way, the fluid guide 3 can stabilize the swirl with a relatively small height without eccentricity and better swirl upward. In this embodiment, as Figure 1 and Figure 3 shown, the fluid guide 3 may include a cylindrical section 31 and a conical section 32 that are sequentially connected from upstream to downstream and whose outer diameters gradually decrease. The outer diameter of the cylindrical section 31 is 0.1 to 0.5 times the inner diameter of the inner cylinder 2, for example 0.3 times. In this way, the fluid guide 3 can not only achieve stable flow but also prevent the airflow tangentially entering from the air inlet 11 from hitting the fluid guide 3 and thus hindering the formation of rotational flow. The height of the fluid guide 3 is 1 to 3 times the height of the air inlet 11. In other embodiments, the downstream end of the fluid guide 3 extends until the downstream end of the cylinder body 1. As Figure 5 shown, the fluid guide 3 extends upward from the bottom end of the cylinder body 1 until the top end of the cylinder body 1 and is connected to the end cover 13 (to be introduced below). In this way, the fluid guide 3 can solve the problem of uneven flow at both the air inlet 11 and the exhaust port 12 at the same time. In this embodiment, the fluid guide 3 is a cylinder, the height of the fluid guide 3 is equal to the height of the cylinder body 1, and the outer diameter of the fluid guide 3 can be 0.1 to 0.5 times the inner diameter of the inner cylinder 2, for example 0.3 times.

[0053] The separators in the above two embodiments are both for gas to enter from the bottom and exit from the top. In other embodiments, the gas can also enter from the top and exit from the bottom, for example Figure 8 as shown. In Figure 8 , an end cover 13 is provided at one end of the cylinder body 1 corresponding to the air inlet 11. The air inlet 11 is a tangential air inlet close to the end cover 13. The fluid guide 3 extends downward from the end cover 13 to below the air inlet 11, and the height of the fluid guide 3 is 1 to 3 times the height of the air inlet 11.

[0054] In the present invention, the fluid guide 3 can be hollow or solid. The fluid guide 3 can be fixed in the cylinder in any suitable manner. In Figure 8 the shown embodiment, one end of the fluid guide 3 is directly connected to the end cover 13. In other embodiments, the fluid guide 3 can be connected to the cylinder body 1 through a connection assembly. Specifically, as Figure 3 and Figure 4 shown, the connection assembly may include a plurality of connecting guide vanes 33. Each connecting guide vane 33 extends from the outer peripheral surface of the lower part of the fluid guide 3 in the radial direction of the fluid guide 3 to the inner peripheral surface of the cylinder body 1, and the plurality of connecting guide vanes 33 are evenly spaced along the circumferential direction of the fluid guide 3. In order not to affect the swirl of the airflow, as Figure 1 shown, the connection assembly is located below the air inlet 11.

[0055] In some embodiments, as Figure 1 shown, the air inlet 11 is provided on the barrel wall of the barrel body 1 and is arranged such that the gas enters tangentially along the barrel body 1. In this case, the downstream end of the flow guide 3 is located downstream of the air inlet 11 and upstream of the inner barrel 2, and the height of the flow guide 3 is 1 to 3 times the height of the air inlet 11.

[0056] Among them, the air inlet 11 can be a straight-cut air inlet or a volute air inlet. The number of the air inlets 11 can be one or multiple ones arranged axially symmetrically about the barrel body. For example Figure 2 shown, the air inlet 11 is a straight-cut air inlet extending tangentially along the barrel body 1, and the cross section of the air inlet 11 is square.

[0057] In some embodiments, referring to Figure 1 , Figure 5 and Figure 7 , one end of the barrel body 1 corresponding to the exhaust port 12 is provided with an end cover 13, and the downstream end of the inner barrel 2 is connected to the end cover 13. In order to enable the gas in the inner barrel 2 to be discharged from the exhaust port 12, the inner barrel 2 and the end cover 13 can be non-sealingly connected to form an exhaust channel therebetween; or the inner barrel 2 and the end cover 13 can be sealingly connected, and a cut is opened on the barrel wall of the inner barrel 2. It can be understood that the cut is an arc-shaped opening.

[0058] In some embodiments, a first cut 22 is opened on the downstream barrel wall of the inner barrel 2, and the first cut 22 communicates with the exhaust port 12. In Figure 5 the shown embodiment, the gas in the inner barrel 2 can enter the annular channel through the first cut 22 and be discharged from the exhaust port 12. In Figure 1 the shown embodiment, the gas in the annular channel between the barrel body 1 and the inner barrel 2 can enter the inner barrel 2 through the first cut 22 and be discharged from an exhaust pipe 5 (to be introduced below) provided at the exhaust port 12.

[0059] In some embodiments, the DC cyclone separator further includes at least one inner sleeve 4 concentrically sleeved inside the inner barrel 2. There are annular channels between the inner sleeves 4 and between the inner sleeve 4 and the inner barrel 2, and the outer diameter of the flow guide 3 is smaller than the inner diameter of the innermost inner sleeve 4. By providing the inner sleeve 4, the impurity separation and trapping surface can be further increased, the movement distance of the impurities to the trapping surface can be shortened, and the separation efficiency can be improved. During use, the swirling flow in the barrel body 1 moves forward into the annular channel between the barrel body 1 and the inner barrel 2, the annular channel between the inner barrel 2 and the inner sleeve 4, the annular channel between the inner sleeves 4, and spirally moves forward inside the innermost inner sleeve 4.

[0060] It can be understood that, as described above, in the case where the number of the inner sleeves 4 is multiple, the multiple inner sleeves 4 are concentrically sleeved at intervals.

[0061] In some embodiments, a plurality of second slit holes 41 are spaced apart on the barrel wall of the inner sleeve 4. The second slit holes 41 are used to timely discharge the impurities transported to the side wall, reduce the backmixing and entrainment of the impurities, and further improve the separation efficiency. The arrangement of the second slit holes 41 is similar to that of the first slit holes 21. Refer to Figure 5 and Figure 8 , the second slit holes 41 can be arranged in a staggered manner with respect to the first slit holes 21.

[0062] In order to enable the gas in the inner sleeve 4 to be discharged from the exhaust port 12, a gap can be provided between the downstream end of the inner sleeve 4 and the end cap 13, or the connection with the end cap 13 can be non-sealed to form an exhaust passage therebetween. In some embodiments, refer to Figure 5 and Figure 7 , the downstream end of the inner sleeve 4 is connected to the end cap 13, and a second cut 42 is provided on the downstream barrel wall of the inner sleeve 4, and the second cut 42 corresponds to and communicates with the first cut 22.

[0063] In the present invention, in some embodiments, as Figure 5 shown, the exhaust port 12 is provided on the barrel wall of the barrel body 1 and is arranged such that the gas is discharged tangentially to the barrel body 1, and the positions of the first cut 22 and the second cut 42 correspond to the exhaust port 12.

[0064] Among them, the number of the exhaust ports 12 can be one or a plurality arranged axially symmetrically with respect to the barrel body. For example Figure 5 shown, the exhaust port 12 is a straight-cut exhaust port extending tangentially to the barrel body 1. In some embodiments, the cross-section of the exhaust port 12 is square.

[0065] In some embodiments, as Figure 1 shown, the exhaust port 12 is provided on the end cap 13, and the direct current cyclone separator further includes an exhaust pipe 5 passing through the exhaust port 12, and the exhaust pipe 5 is a straight pipe.

[0066] In other embodiments, as Figure 8 shown, one end port of the barrel body 1 is formed as the exhaust port 12, and an exhaust pipe 5 is passed through the exhaust port 12. The exhaust pipe 5 is a bent pipe, and one end of the exhaust pipe 5 extends outside the hopper 6 (to be introduced below).

[0067] Among them, the exhaust pipe 5 can be a pipe with a constant diameter or a pipe with a variable diameter. Exhaust holes 51 can also be provided on the pipe wall of the exhaust pipe 5 extending into the barrel body 1. The gas can be discharged through both the pipe orifice of the exhaust pipe 5 and the exhaust holes 51. The exhaust holes 51 can divide the exhaust flow and reduce the exhaust resistance. Preferably, there are a plurality of exhaust holes 51, and the plurality of exhaust holes 51 can be spaced apart along the circumference of the exhaust pipe 5. The exhaust holes 51 are preferably long strip-shaped holes extending axially along the exhaust pipe 5.

[0068] In the present invention, in order to discharge the impurities separated from the gas, a discharge port is further provided at one end of the cylinder body 1.

[0069] Specifically, in some embodiments, referring to Figure 1 , Figure 5 and Figure 8 , the DC cyclone separator may further include a hopper 6 connected to the bottom end of the cylinder body 1 and communicating with the cavity of the cylinder body 1. A discharge port 61 is provided at the bottom of the hopper 6. Among them, the hopper 6 is used to collect the impurities falling in the cylinder body 1, and the discharge port 61 is used to discharge the impurities in the hopper 6. It can be understood that in the embodiments shown in Figure 1 and Figure 5 , the lower port of the cylinder body 1 forms the discharge port of the cylinder body. In the embodiment shown in Figure 8 , the annular opening between the lower port of the cylinder body 1 and the exhaust pipe 5 is the discharge port of the cylinder body 1.

[0070] In the present invention, it should be noted that the cylinder body 1, the inner cylinder 2 and the inner sleeve 4 can be equal-diameter circular straight cylinders or variable-diameter cylinders.

[0071] The present invention will be further introduced below in conjunction with embodiments.

[0072] Embodiment 1

[0073] Referring to Figures 1 - 4 , a DC cyclone separator is provided, which includes a cylinder body 1, an inner cylinder 2, a deflector 3, an exhaust pipe 5 and a hopper 6. Among them, a straight tangential air inlet 11 extending along the tangential direction of the cylinder body 1 is provided at the lower part of the cylinder body 1, and the cross-section of the air inlet 11 is rectangular; a deflector 3 is provided at the center of the lower part of the cylinder body 1. The deflector 3 includes a cylindrical section 31 located below and a conical section 32 located above. The height of the deflector 3 is 1.5 times the height of the air inlet 11, the maximum outer diameter of the deflector 3 is 0.3 times the inner diameter of the inner cylinder 2, and the lower part of the deflector 3 is fixedly connected to the cylinder body 1 through 4 connecting guide vanes 33; the axial distance between the bottom end of the inner cylinder 2 and the upper end face of the air inlet 11 is 1 time the height of the air inlet, the top end of the inner cylinder 2 is intermittently connected to the end cover 13, and 4 first cutouts 22 are defined on its cylinder wall; the exhaust pipe 5 is located at the center of the cylinder body 1 and is inserted below the end cover 13. A plurality of elongated exhaust holes 51 (50 mm long and 4 mm wide) extending along its axial direction are provided on the lower pipe wall of the exhaust pipe 5, and the plurality of exhaust holes 51 are arranged at intervals along the circumferential direction of the exhaust pipe 5. Among them, the inner diameter of the cylinder body 1 is 300 mm, the height is 750 mm, the inner diameter of the inner cylinder 2 is 220 mm, the height is 410 mm, the outer diameter of the exhaust pipe 5 is 110 mm, and the size of the air inlet 11 is 176×73 mm.

[0074] Under the atmospheric conditions of laboratory ambient temperature and pressure, the performance test of this embodiment was carried out using 800-mesh ultrafine silica powder and air. The test was conducted on an induced draft fan suction type negative pressure test system. The powder was added to the air inlet 11 after manual weighing. The air volume of the air inlet 11 was measured with a hot wire anemometer, the pressure drop of the separator was measured with a U-tube manometer, and the separation efficiency was calculated after collecting and weighing the materials in the hopper.

[0075] The experimental results were as follows: at the inlet air velocities of 15 m / s, 20 m / s, and 24.2 m / s respectively, the separation efficiencies were 91.6%, 92.5%, and 93.4% respectively, and the corresponding pressure drops were 610 Pa, 750 Pa, and 1010 Pa respectively.

[0076] Example 2

[0077] See Figures 5 - 7 , a DC cyclone separator is provided, which includes a cylinder body 1, an inner cylinder 2, a deflector 3, an inner sleeve 4, and a hopper 6. Among them, a straight-cut air inlet 11 extending tangentially along the cylinder body 1 is provided at the lower part of the cylinder body 1, the cross-section of the air inlet 11 is rectangular, a straight-cut exhaust port 12 extending tangentially along the cylinder body 1 is provided at the upper part of the cylinder body 1, the cross-section of the exhaust port 12 is rectangular, and the first cut 22 on the inner cylinder 2 and the second cut 42 on the inner sleeve 4 are opposite to the exhaust port 12; the deflector 3 is a cylinder extending upward from the bottom of the cylinder body 1 to the top, the height of the deflector 3 is equal to the height of the cylinder body 1, the outer diameter of the deflector 3 is 0.3 times the inner diameter of the inner sleeve 4, the lower part of the deflector 3 is fixedly connected to the cylinder body 1 through 4 connecting guide vanes 33, and the top of the deflector 3 is connected to the end cover 13; the axial distance between the bottom end of the inner cylinder 2 and the upper end face of the air inlet 11 is 1 time the height of the air inlet, and the top end of the inner cylinder 2 is connected to the end cover 13. Among them, the inner diameter of the cylinder body 1 is 300 mm, the height is 750 mm, the inner diameter of the inner cylinder 2 is 220 mm, the height is 410 mm, the inner diameter of the inner sleeve 4 is 160 mm, the height is 370 mm, the size of the air inlet 11 is 176×73 mm, and the size of the exhaust port 12 is 130×66 mm.

[0078] Under the atmospheric conditions of laboratory ambient temperature and pressure, the performance test of this embodiment was carried out using 800-mesh ultrafine silica powder and air. The test was conducted on an induced draft fan suction type negative pressure test system. The powder was added to the air inlet 11 after manual weighing. The air volume of the air inlet 11 was measured with a hot wire anemometer, the pressure drop of the separator was measured with a U-tube manometer, and the separation efficiency was calculated after collecting and weighing the materials in the hopper.

[0079] The experimental results are as follows: at the inlet gas velocities of 14.0 m / s, 21.1 m / s, and 24.0 m / s respectively, the separation efficiencies are 92.6%, 93.0%, and 94.1% respectively, and the corresponding pressure drops are 615 Pa, 750 Pa, and 1020 Pa respectively.

[0080] Example 3

[0081] See Figures 8 - 9 , a direct current cyclone separator is provided, which includes a cylinder body 1, an inner cylinder 2, a deflector 3, an exhaust pipe 5, an inner sleeve 4, and a hopper 6. Among them, a straight-cut air inlet 11 extending tangentially along the cylinder body 1 is provided at the upper part of the cylinder body 1, and the cross-section of the air inlet 11 is rectangular; a end cover 13 is provided at the top of the cylinder body 1, the tops of the inner cylinder 2 and the inner sleeve 4 are connected to the end cover 13, the first cut 22 on the inner cylinder 2 and the second cut 42 on the inner sleeve 4 are opposite to the air inlet 11, a deflector 3 is provided at the upper center of the inner sleeve 4, the top of the deflector 3 is connected to the end cover 13, the deflector 3 includes a cylindrical section 31 located above and a conical section 32 located below, the height of the deflector 3 is 1.5 times the height of the air inlet 11, the height of the cylindrical section 31 is the same as the height of the air inlet 11, the height of the conical section 32 is half of the height of the air inlet, and the outer diameter of the cylindrical section 31 is 0.3 times the inner diameter of the inner cylinder 2; the bottom end of the inner cylinder 2 is above the bottom end of the cylinder body 1, and the bottom end of the inner sleeve 4 is above the bottom end of the inner cylinder 2; a hopper 6 is connected to the lower end of the cylinder body 1, one end of the exhaust pipe 5 is inserted into the lower end port of the cylinder body 1, and the other end of the exhaust pipe 5 extends out of the hopper 6 through the opening on the hopper 6.

[0082] Comparative example

[0083] Comparative example 1 is a conventional direct current cyclone separator, and the difference in its structure from that of Example 1 is only that there is no inner cylinder 2.

[0084] Under the atmospheric conditions of the laboratory ambient temperature and pressure, the performance test of this example is carried out with 800-mesh ultrafine silica powder and air. The test is carried out on an induced draft fan suction type negative pressure test system. The powder is added to the air inlet 11 after being weighed manually. The air volume of the air inlet 11 is measured by a hot wire anemometer, the pressure drop of the separator is measured by a U manometer, and the separation efficiency is calculated after collecting and weighing the materials in the hopper.

[0085] The experimental results are as follows: at the inlet gas velocities of 15.0 m / s, 20.0 m / s, and 24.2 m / s respectively, the separation efficiencies are 63.5%, 65.2%, and 66.0% respectively, and the corresponding pressure drops are 600 Pa, 646 Pa, and 907 Pa respectively.

[0086] As can be seen from the above experimental results, the separation efficiency of the separator of the present invention is about 30% higher than that of the conventional separator, and the pressure drops of the two are similar. Therefore, while significantly improving the separation efficiency, the present invention basically maintains the advantage of the low pressure drop of the direct current cyclone separator, achieving low resistance and high efficiency, and having very good application prospects.

[0087] So far, the embodiments of the present invention have been described in detail. To avoid obscuring the concept of the present invention, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0088] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for the purpose of illustration and not for the purpose of limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified or partial technical features can be equivalently replaced without departing from the scope and spirit of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each of the embodiments can be combined in any manner.

Claims

1. A DC cyclone separator, comprising a cylinder body (1), with an air inlet (11) and an air outlet (12) respectively arranged at two ends of the cylinder body (1), characterized in that, The DC cyclone separator further includes an inner cylinder (2), the inner cylinder (2) is concentrically sleeved inside the cylinder body (1), and an annular channel is formed between the inner cylinder (2) and the cylinder body (1). The cavity of the inner cylinder (2) and the annular channel are both communicated with the air inlet (11), so that the swirling flow formed by the gas to be separated entering from the air inlet (11) spirally enters the exhaust port (12) through the cavity of the inner cylinder (2) and the annular channel respectively.

2. The DC cyclone separator according to claim 1, wherein A plurality of first slit holes (21) are spaced apart on the cylinder wall of the inner cylinder (2).

3. The direct current cyclone separator according to claim 2, wherein The plurality of first slit holes (21) are arranged in a spiral shape along the axial direction of the inner cylinder (2), and / or The first slit hole (21) is a long strip hole extending along the axial direction of the inner cylinder (2).

4. The direct current cyclone separator according to claim 1, characterized in that, One end of the cylinder body (1) is further provided with a discharge port, and / or The DC cyclone separator further includes a fluid guide (3), the fluid guide (3) is concentrically arranged inside the cylinder body (1), and is arranged to extend from the upstream side to the downstream side of the air inlet (11). The outer diameter of the fluid guide (3) is smaller than the inner diameter of the inner cylinder (2). Preferably, the downstream end of the fluid guide (3) is located upstream of the inner cylinder (2) or extends until the downstream end of the cylinder body (1).

5. The DC cyclone separator according to claim 4, characterized in that, The fluid guide (3) includes a cylindrical section (31) and a conical section (32) which are sequentially connected from upstream to downstream and have a gradually decreasing outer diameter. The outer diameter of the cylindrical section (31) is 0.1 - 0.5 times the inner diameter of the inner cylinder (2); and / or The air inlet (11) is arranged on the cylinder wall of the cylinder body (1) and is arranged to allow gas to enter tangentially along the cylinder body (1). The downstream end of the fluid guide (3) is located downstream of the air inlet (11). Preferably, the height of the fluid guide (3) is 1 - 3 times the height of the air inlet (11).

6. The DC cyclone separator according to claim 4, characterized in that The fluid guide (3) is connected to the cylinder body (1) through a connecting component, Preferably, the connecting component includes a plurality of connecting guide vanes (33), each connecting guide vane (33) extends from the outer peripheral surface of the fluid guide (3) in the radial direction of the fluid guide (3) to the inner peripheral surface of the cylinder body (1), and the plurality of connecting guide vanes (33) are evenly spaced along the circumferential direction of the fluid guide (3).

7. The DC cyclone separator according to any one of claims 1 - 6, characterized in that One end of the cylinder body (1) corresponding to the exhaust port (12) is provided with an end cover (13), the downstream end of the inner cylinder (2) is connected to the end cover (13), and a first cut (22) is formed on the downstream cylinder wall of the inner cylinder (2), and the first cut (22) is communicated with the exhaust port (12); and / or The DC cyclone separator further includes at least one inner sleeve (4) concentrically sleeved inside the inner cylinder (2), and annular channels are formed between the inner sleeves (4) and between the inner sleeve (4) and the inner cylinder (2).

8. The direct current cyclone separator according to claim 7, characterized in that, A plurality of second slit holes (41) are spaced apart on the cylinder wall of the inner sleeve (4), and / or The downstream end of the inner sleeve (4) is connected to the end cap (13). A second cutout (42) is formed in the downstream cylindrical wall of the inner sleeve (4), and the second cutout (42) communicates with the first cutout (22) correspondingly.

9. The direct current cyclone separator according to claim 8, wherein, The exhaust port (12) is arranged on the cylindrical wall of the cylinder body (1) and is arranged such that gas is discharged tangentially along the cylinder body (1). The positions of the first cutout (22) and the second cutout (42) correspond to the exhaust port (12).

10. The direct current cyclone separator according to claim 7, characterized in that, The exhaust port (12) is formed in the end cap (13). The direct current cyclone separator further includes an exhaust pipe (5) penetrating through the exhaust port (12); preferably, exhaust holes (51) are formed in the pipe wall of the exhaust pipe (5) extending into the cylinder body (1).

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