Pulverized coal dense-thin separator

Abstract

The invention discloses a pulverized coal dense-thin separator. The pulverized coal concentration separator comprises a communicating device and a concentration adjusting device, the communicating device is used for being connected with a pulverized coal conveying device, and the communicating device is provided with a conveying channel used for conveying pulverized coal through airflow; the concentration adjusting device comprises a flow control component and an adjusting driving component, the flow control component is movably connected into the conveying channel so as to adjust the conveying amount of the pulverized coal, and the adjusting driving component is connected with the flow control component so as to drive the flow control component to move so as to adjust the opening degree of the conveying channel. The air speed can be kept unchanged under the condition of the pulverized coal content, input of the pulverized coal is reduced, and uniform combustion of the pulverized coal can be guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy, in particular to a coal powder concentration and dilution separator. BACKGROUND

[0002] In the traditional technology, the means of power generation mainly includes thermal power generation and renewable resource power generation. Although the proportion of renewable resource power generation is gradually increasing, the consumption capacity and peak regulation capacity of renewable energy are not as good as thermal power generation, resulting in that thermal power generation is still the main power generation means at the present stage. The fuel used by thermal power generation is mainly coal, in order to improve the utilization rate of coal, the coal is made into coal powder for use. The use of electricity is peak-valley, the peak value of electricity during normal working hours is relatively low, the electricity consumption during the evening to the early morning will increase significantly, and the electricity consumption between the early morning and the early morning is the lowest. At the same time, the electricity consumption in spring and autumn seasons will also decrease compared with that in winter and summer seasons. Therefore, the thermal power generation equipment needs to be adjusted according to the peak and valley of electricity consumption, and the power is reduced during the low valley of electricity consumption, so as to avoid the waste of electricity.

[0003] The traditional peak regulation means of power generation equipment mainly changes the concentration of coal powder in the primary air flow or reduces the wind speed of the air flow, so as to reduce the input amount of coal powder in the same time. However, the above-mentioned means for changing the concentration of coal powder has the following defects: changing the concentration of coal powder in the primary air flow needs to accurately control the delivery amount of coal powder each time, which is difficult to operate; and reducing the wind speed of the air flow will reduce the delivery capacity of the coal powder, and the coal powder loses the initial speed during entering the combustor and burns at the mouth of the combustor, resulting in uneven combustion. SUMMARY

[0004] Therefore, it is necessary to provide a coal powder concentration and dilution separator which can solve the problem of uneven combustion of coal powder in the traditional technology.

[0005] An embodiment of the present application provides a coal powder concentration and dilution separator.

[0006] The coal powder concentration and dilution separator comprises a communication device and a concentration adjusting device, the communication device is used for connecting a coal powder delivery device, and the communication device has a delivery channel for delivering coal powder through an air flow; the concentration adjusting device comprises a flow control component and an adjusting driving component, the flow control component is movably connected in the delivery channel to adjust the delivery amount of coal powder, and the adjusting driving component is connected with the flow control component to drive the flow control component to move and adjust the opening degree of the delivery channel.

[0007] In some embodiments, the communication device comprises a feeding pipe and a discharging pipe which are in communication with each other, and the feeding pipe is used for connecting the coal powder delivery device.

[0008] In some embodiments, the feeding pipe and the discharging pipe extend along the same axis.

[0009] In some embodiments, the radial dimension of the feed pipe is larger than that of the discharge pipe.

[0010] In some embodiments, the connecting section between the feed pipe and the discharge pipe gradually narrows along the direction of gas flow.

[0011] In some embodiments, the flow control component comprises at least two flow disks, and the flow disks can be assembled to adapt to the shape of the cross section of the transmission channel. The adjustment driving component is connected to at least one flow disk to drive the rotation of the flow disk to adjust the opening of the transmission channel.

[0012] In some embodiments, the flow disk is in a semicircular structure, and the cross section of the transmission channel is circular. Two flow disks can be assembled to a circular shape with a radius equal to that of the cross section of the transmission channel.

[0013] In some embodiments, the side edges of the adjacent flow disks are provided with tooth columns, and the adjacent tooth columns are engaged with each other. The tooth columns are rotatably connected to the inner wall of the transmission channel.

[0014] In some embodiments, at least one end of the tooth column is provided with a hinged rod, which is hinged to the inner wall of the transmission channel. At least one hinged rod is connected to and driven to rotate by the adjustment driving component.

[0015] In some embodiments, the concentration adjustment device further comprises a curved air deflector, which is located on the surface of the tooth column facing the feed inlet of the transmission channel to shield the tooth column.

[0016] In some embodiments, one side of the flow disk facing the feed inlet of the transmission channel is provided with a plurality of impact blades.

[0017] In some embodiments, the end of the impact blade facing the feed inlet of the transmission channel is provided with a sharp surface.

[0018] In some embodiments, the coal dust concentration separator further comprises a coarse dust filtering device downstream of the concentration adjusting device, the coarse dust filtering device comprising a separation section, a support ring and a pore size adjusting section sequentially arranged in the transmission channel, and a gear transmission device connected to the pore size adjusting section; the pore size adjusting section is penetrated by staggered holes extending along the airflow direction, the support ring is penetrated by powder passing holes extending along the airflow direction, the pore size adjusting section is limited between the separation section and the support ring and rotatably fitted with the inner wall of the transmission channel, and the gear transmission device is used to drive the pore size adjusting section to rotate along the axial direction of the transmission channel so that the staggered holes and the powder passing holes can be staggered and at least partially communicated.

[0019] In some embodiments, the communication device is provided with a transmission groove communicated with the transmission channel, the pore size adjusting section is partially located in the transmission groove, and the gear transmission device partially extends into the transmission groove and is connected to the pore size adjusting section.

[0020] In some embodiments, the outer circumferential surface of the pore size adjusting section has driven teeth, and the driving gear of the gear transmission device is engaged with the driven teeth of the pore size adjusting section.

[0021] In some embodiments, the separation section and the pore size adjusting section are disc-shaped, the support ring is annular, the outer diameter of the separation section, the outer diameter of the support ring and the outer diameter of the pore size adjusting section are equal, and the separation section, the support ring and the pore size adjusting section are equal to the inner diameter of the transmission channel.

[0022] In some embodiments, the number of staggered holes and the number of powder passing holes are both multiple.

[0023] In some embodiments, the separation section comprises a filter disc, the filter disc is fixed in the transmission channel, and a plurality of powder passing holes are formed in the filter disc.

[0024] In some embodiments, the pore size adjusting section comprises a movable disc, the movable disc is provided with the staggered holes matched with the powder passing holes.

[0025] In some embodiments, the surface of the movable disc towards the separation section is provided with a center positioning shaft at the axial center, and the center positioning shaft is rotatably fitted with the axial center of the separation section.

[0026] In some embodiments, the opening edge of the powder passing hole towards the feed inlet of the transmission channel is provided with an arc-shaped chamfer.

[0027] In some embodiments, the coal powder concentration separator further comprises a coarse material separation device, the coarse material separation device comprising a coarse material separation pipe connected to the transmission channel at a position between the concentration adjusting device and the coarse powder filtering device.

[0028] In some embodiments, the coarse material separation device further comprises an anti-accumulation chamfer device arranged at the pipe opening where the coarse material separation pipe communicates with the transmission channel, and the anti-accumulation chamfer device protrudes towards the middle of the transmission channel.

[0029] The coal powder concentration separator can solve the problem of uneven combustion of coal powder in traditional technology, and can maintain the wind speed basically unchanged while reducing the amount of coal powder, and ensure uniform combustion of coal powder. Specifically, in use, the coal powder concentration separator adjusts the opening of the transmission channel by adjusting the angle of the flow control component, thereby maintaining the wind speed unchanged in the presence of coal powder, reducing the input of coal powder, adjusting the concentration ratio, and ensuring uniform combustion of coal powder.

[0030] In summary, the coal powder concentration separator has the following advantages:

[0031] (1) The angle of the flow control component is adjusted to adjust the opening of the transmission channel, the wind speed is maintained unchanged in the presence of coal powder, the input of coal powder is reduced, and the uniform combustion of coal powder is ensured.

[0032] (2) The coal powder in the transmission process passes through the two sides of the deflector, and the windward surface of the tooth column is shielded by the deflector, so that the coal powder is not blocked between the adjacent two tooth columns during the transmission process, and the flexibility of the flow disc is improved.

[0033] (3) The isolation part, support ring and aperture adjusting part are installed inside the transmission channel, and the aperture adjusting part is driven to rotate by the gear transmission device, the dislocation of the dislocation hole and the powder passing hole is controlled by the rotation of the aperture adjusting part, and at least part of the dislocation hole and the powder passing hole is communicated, that is, the opening of the powder passing hole is changed, and the coal powder flux passing through the powder passing hole is adjusted, so that the coarse particle coal powder can be filtered.

[0034] (4) The coarse material separation pipe is provided to recover the blocked coarse particle coal powder, and the coarse material separation pipe is discharged and recovered under the driving action of the coarse material separation pipe in the flow separation part, and is ground again.

[0035] (5) The anti-accumulation chamfer device is arranged to avoid the accumulation of coarse particle coal powder at the pipe opening where the coarse material separation pipe communicates with the transmission channel, and to avoid the blockage of the transmission channel.

[0036] (6) The present application effectively overcomes the shortcomings of the prior art and has high industrial utilization value. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0038] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings. In the following description, the same reference numerals represent the same parts.

[0039] Figure 1 A schematic diagram of the coal powder thick and thin separator according to an embodiment of the present application;

[0040] Figure 2 A sectional view of the coal powder thick and thin separator according to an embodiment of the present application;

[0041] Figure 3 A schematic diagram of the coal powder transmission path of the coal powder thick and thin separator according to an embodiment of the present application;

[0042] Figure 4 A right view of the coal powder thick and thin separator according to an embodiment of the present application;

[0043] Figure 5 A schematic diagram of the structure of the flow control component of the coal powder thick and thin separator according to an embodiment of the present application;

[0044] Figure 6 A schematic diagram of the position relationship between the air deflector and the flow control component of the coal powder thick and thin separator according to an embodiment of the present application;

[0045] Figure 7 A schematic diagram of the structure of the coarse powder filtering device of the coal powder thick and thin separator according to an embodiment of the present application;

[0046] Figure 8 Another angle schematic diagram of the coarse powder filtering device of the coal powder thick and thin separator according to an embodiment of the present application;

[0047] Figure 9 An explosion schematic diagram of the coal powder thick and thin separator according to an embodiment of the present application;

[0048] Figure 10 A schematic diagram of the structure of the transmission groove of the coal powder thick and thin separator according to an embodiment of the present application;

[0049] Figure 11 AFigure 10 Structure enlarged schematic view at A in the middle.

[0050] Reference signs

[0051] 10, coal powder concentration separator; 1, communication device; 101, feeding pipe; 102, discharging pipe; 1011, transmission channel; 1012, feeding port; 103, transmission groove; 2, concentration adjusting device; 201, flow control component; 2011, flow disc; 2012, tooth column; 2013, hinged rod; 2014, impact blade; 202, adjusting motor; 203, air deflector; 3, coarse powder filtering device; 301, isolation part; 3011, filtering disc; 3012, powder passing hole; 3013, arc chamfer; 302, support ring; 303, aperture adjusting part; 3031, movable disc; 3032, staggered hole; 3033, driven gear; 3034, center positioning shaft; 304, gear transmission device; 4, coarse material separating device; 401, coarse material separating pipe; 402, anti-accumulation chamfer device. DETAILED DESCRIPTION

[0052] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore contemplated to cover all such modifications as fall within the scope of the application. It is to be understood that the description of the present application is meant to be illustrative only and not limiting as to the scope of the application.

[0053] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" 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 purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0054] In the present application, unless specifically defined otherwise and limited, the terms "mount", "connected", "connection", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless specifically defined otherwise. 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.

[0055] In the present application, unless specifically defined otherwise and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0056] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described that the first, second is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0057] In this paper, "optionally", "optional", "optional" means optional, that is, optional from "have" or "no" two parallel schemes. If there are multiple "optional" in a technical solution, unless otherwise specified, and there is no contradiction or mutual restriction, each "optional" is independent of each other. In the present application, "optionally contains", "optionally contains" and the like, means "contains or does not contain".

[0058] In this paper, unless otherwise specified, each reaction step can be carried out in the order described herein, or can not be carried out in the order described herein. For example, each reaction step can contain other steps, and the order of the reaction steps can also be appropriately changed. This can be determined by those skilled in the art according to conventional knowledge and experience. Preferably, the reaction method in this paper is carried out in sequence.

[0059] In this application, when numerical intervals (i.e., numerical ranges) are mentioned, unless otherwise specified, the distribution of selectable numerical values ​​within the numerical interval is considered continuous, and includes the two endpoints of the numerical interval (i.e., the minimum and maximum values), as well as every numerical value between these two endpoints. Unless otherwise specified, when a numerical interval refers only to integers within that numerical interval, it includes the two endpoint integers of the numerical range, as well as every integer between the two endpoints, which is equivalent to directly listing every integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be merged. In other words, unless otherwise specified, the numerical ranges disclosed in this application should be understood to include any and all subranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, percentage, ratio, etc. The term "numerical interval" can be broadly included to include percentage intervals, ratio intervals, proportion intervals, etc.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0061] This application provides a pulverized coal concentration separator to address at least one of the following technical problems in existing conventional technologies that reduce the amount of pulverized coal input within a given time by changing the concentration of pulverized coal in the primary airflow or reducing the airflow velocity: (1) Changing the concentration of pulverized coal in the primary airflow requires precise control of the amount of pulverized coal conveyed each time, which is difficult to operate; (2) Reducing the airflow velocity will reduce the conveying capacity of the pulverized coal, causing it to lose its initial velocity during entry into the burner and burn at the burner inlet, resulting in uneven combustion. The pulverized coal concentration separator will be described below with reference to the accompanying drawings.

[0062] The pulverized coal concentration separator 10 provided in this application embodiment is exemplary; please refer to [link to example]. Figure 1 As shown, Figure 1 This is a schematic diagram of the pulverized coal concentration separator 10 provided in an embodiment of this application. The pulverized coal concentration separator 10 of this application can be used for thermal power generation, and reduces the amount of pulverized coal input in the same time period without changing the pulverized coal concentration in the airflow or reducing the wind speed, thus avoiding uneven combustion of pulverized coal.

[0063] To more clearly illustrate the structure of the pulverized coal concentration separator 10, the following description of the pulverized coal concentration separator 10 will be provided in conjunction with the accompanying drawings.

[0064] For example, please refer to Figure 1As shown in the figure, a coal powder concentration separator 10 includes a communication device 1 and a concentration adjusting device 2. The communication device 1 is used to connect a coal powder conveying device. The communication device 1 has a conveying passage 1011 for conveying coal powder through air flow. The concentration adjusting device 2 includes a flow control component 201 and an adjusting driving component. The flow control component 201 is movably connected in the conveying passage 1011 of the communication device 1 to adjust the conveying amount of coal powder. The adjusting driving component is connected to the flow control component 201 to drive the flow control component 201 to move to adjust the opening degree of the conveying passage 1011 of the communication device 1. The concentration adjusting device 2 is installed on the communication device 1 to adjust the conveying amount of coal powder. The concentration adjusting device 2 changes the opening degree of the conveying passage 1011 in the conveying passage 1011 of the communication device 1, thereby controlling the size of the cross section to change the amount of coal powder that can pass through the conveying passage 1011 at the same time, and the wind speed of the air flow does not decrease because the cross section decreases, but instead increases slightly. After the air flow passes through the concentration adjusting device 2, the size of the cross section returns to the original size, and the air flow basically returns to the original speed, thereby uniformly conveying the coal powder to the burner to avoid the accumulation of coal powder at the mouth of the burner. It should be noted that the opening degree of the conveying passage 1011 described above and below refers to the size of the area of the conveying passage 1011 that is opened.

[0065] The coal powder concentration separator 10 described above can solve the problem of uneven combustion of coal powder in the prior art, and can maintain the wind speed basically unchanged while reducing the amount of coal powder, thereby ensuring uniform combustion of coal powder. Specifically, in use of the coal powder concentration separator 10 described above, the opening degree of the conveying passage 1011 of the communication device 1 is adjusted by the movement of the flow control component 201, thereby maintaining the wind speed unchanged in the presence of coal powder, reducing the input of coal powder, and ensuring uniform combustion of coal powder.

[0066] In some embodiments, please refer to Figure 2 As shown in the figure, Figure 2 The figure is a sectional view of the coal powder concentration separator 10 according to an embodiment of the present application. The communication device 1 includes a feeding pipe 101 and a discharging pipe 102 that are in communication with each other. The feeding pipe 101 is used to connect a coal powder conveying device.

[0067] In some embodiments, the feeding pipe 101 and the discharging pipe 102 extend along the same axis. Please refer to Figure 3 As shown in the figure, Figure 3 The figure is a schematic diagram of a coal powder conveying path of the coal powder concentration separator 10 according to an embodiment of the present application. The coal powder conveying in the present application is shown in the direction of the arrow.

[0068] In some embodiments, the radial dimension of the inlet pipe 101 is larger than the radial dimension of the outlet pipe 102. In order to increase the velocity of the gas flow, the radial dimension of the inlet pipe 101 is larger than the radial dimension of the outlet pipe 102, and the connection between the inlet pipe 101 and the outlet pipe 102 is smoothly transitioned, so that the cross section of the gas flow is reduced, and the flow rate of the gas flow can be increased. It should be noted that the radial dimension can be the inner diameter, length and width, side length, diagonal length, etc., and the specific size of the radial dimension is defined according to the radial cross-sectional shape of the inlet pipe 101 and the outlet pipe 102.

[0069] In some embodiments, the inlet pipe 101 and the outlet pipe 102 are both circular tubes, and the inner diameter of the inlet pipe 101 is larger than the inner diameter of the outlet pipe 102.

[0070] In some embodiments, the connection section between the inlet pipe 101 and the outlet pipe 102 gradually narrows along the direction of the gas flow. The connection section is the transition area of the connection position between the inlet pipe 101 and the outlet pipe 102. The connection section is provided in a gradually narrowing structure, which can converge the gas flow and increase the flow rate.

[0071] In some embodiments, the adjustment driving component includes an adjustment motor 202.

[0072] In some embodiments, the flow control component 201 includes at least two flow discs 2011. The plurality of flow discs 2011 can be spliced to form a shape that is adapted to the cross section of the transmission channel 1011 of the communication device 1. The adjustment driving component is connected to at least one flow disc 2011 to drive the flow disc 2011 to rotate and control the opening of the transmission channel 1011 of the communication device 1.

[0073] Please refer to Figure 4 shown, Figure 4 is a right view of the coal powder concentration and dilution separator 10 according to an embodiment of the present application, and when the flow disc 2011 is not completely closed, the flow disc 2011 has a certain gap with the inner wall of the transmission channel 1011.

[0074] Please refer to Figure 4 shown, two flow discs 2011 are shown, and each flow disc 2011 is basically semicircular.

[0075] In some embodiments, please refer to Figure 5 , Figure 6 shown, Figure 5 is a structural schematic view of the flow control component 201 of the coal powder concentration and dilution separator 10 according to an embodiment of the present application, Figure 6Figure 6 is a schematic view of the position relationship between the air deflector 203 and the flow control component 201 of the coal powder concentration separator 10 according to an embodiment of the present application. The flow disc 2011 is in a semicircular structure, and the number of the flow disc 2011 is two. The cross section of the transmission channel 1011 of the communication device 1 is circular. The two flow discs 2011 can be spliced into a circular shape with the same radius as the cross section of the transmission channel 1011 of the communication device 1. When the two flow discs 2011 are fully unfolded, the internal cross section of the discharge pipe 102 can be completely blocked. As the angle between the two flow discs 2011 decreases, the internal cross section of the discharge pipe 102 gradually increases, the amount of coal powder passing through in the same time increases, and the combustion concentration increases.

[0076] In some embodiments, as shown in Figure 5 , Figure 6 The side edges of the adjacent flow discs 2011 are provided with tooth columns 2012. The adjacent tooth columns 2012 are engaged with each other. The tooth column 2012 is rotatably connected to the inner wall of the transmission channel 1011 of the communication device 1.

[0077] In some embodiments, at least one end of the tooth column 2012 is provided with a hinged rod 2013, which is hinged to the inner wall of the transmission channel 1011 of the communication device 1. The at least one hinged rod 2013 is connected to and driven to rotate by the adjustment driving component. When any hinged rod 2013 is driven by the adjustment driving component, the two flow discs 2011 are engaged through the tooth column 2012, so that the two flow discs 2011 rotate relative to each other, achieving the effect of unfolding and closing.

[0078] In some embodiments, as shown in Figure 6 The concentration adjustment device 2 further comprises a curved air deflector 203. The air deflector 203 is located on the surface of the tooth column 2012 facing the feed inlet 1012 of the transmission channel 1011 of the communication device 1, so as to shield the tooth column 2012. The air deflector 203 is located on the windward surface of the tooth column 2012, so that the air deflector 203 can block the coal powder being conveyed, avoiding the coal powder being stuck between the two tooth columns 2012 during the conveying process, causing the flow disc 2011 to be not flexible in adjusting the angle or damaging the tooth column 2012.

[0079] In some embodiments, as shown in Figure 5 , Figure 6As shown, the flow disc 2011 has several impact blades 2014 on the side facing the feed inlet 1012 of the transmission channel 1011 of the connecting device 1. During the airflow transmission of pulverized coal particles, the particles collide with the impact blades 2014. The impact blades 2014 have a certain probability of causing larger pulverized coal particles to break into smaller particles during the impact. Simultaneously, the flow disc 2011 generates frictional heat during the large-scale collisions with the pulverized coal. The impact blades 2014 also increase the surface area of ​​the flow disc 2011, thereby improving its thermal conductivity.

[0080] In some embodiments, the end of the impact blade 2014 facing the feed inlet 1012 of the transmission channel 1011 of the connecting device 1 is all provided with a sharp surface. The end of the impact blade 2014 facing the feed pipe 101 is all provided with a sharp surface to improve the cutting ability of the impact blade 2014 on coal powder particles.

[0081] In some of these embodiments, please refer to Figure 7 , Figure 8 as well as Figure 9 As shown, Figure 7 This is a schematic diagram of the coarse powder filtration device 3 of the pulverized coal concentration separator 10 according to an embodiment of this application. Figure 8 This is another schematic diagram of the coarse powder filtration device 3 of the pulverized coal concentration separator 10 according to an embodiment of this application. Figure 9 This is an exploded view of a pulverized coal concentration separator 10 according to an embodiment of this application. The pulverized coal concentration separator 10 also includes a coarse powder filter device 3. The coarse powder filter device 3 is located downstream of the concentration regulating device 2. The coarse powder filter device 3 includes an isolation section 301, a support ring 302, and an aperture regulating section 303 installed in sequence within the transmission channel 1011 of the connecting device 1, as well as a gear transmission device 304 connected to the aperture regulating section 303. The aperture regulating section 303 has a staggered hole 3032 extending along the airflow direction. The support ring 302 has a powder passing hole 3012 extending along the airflow direction. The aperture regulating section 303 is confined between the isolation section 301 and the support ring 302 and is rotatably engaged with the inner wall of the transmission channel 1011 of the connecting device 1. The gear transmission device 304 is used to drive the aperture adjustment part 303 to rotate axially along the transmission channel 1011 of the connecting device 1 so that the misaligned hole 3032 and the powder passage hole 3012 can be misaligned and at least partially connected.

[0082] In some of these embodiments, please refer again. Figure 2 , Figure 3 As shown, the gear transmission device 304 is installed on the outer surface of the discharge pipe 102, and drives the gear to transmit the aperture adjustment part 303 through the gear transmission device 304, thereby changing the opening of the powder-passing hole 3012 on the isolation part 301 by blocking the aperture adjustment part 303.

[0083] In some embodiments, referring to Figure 10 With Figure 11 shown, Figure 10 is a schematic view of the structure of the transmission groove 103 of the pulverized coal concentration separator 10 according to an embodiment of the present application, Figure 11 is Figure 10 is an enlarged schematic view of structure at A in FIG. 10. The transmission groove 103 is provided on the communication device 1 and communicates with the transmission channel 1011. The aperture adjusting part 303 is partially located in the transmission groove 103. The gear transmission device 304 partially extends into the transmission groove 103 and is connected with the aperture adjusting part 303. The driving gear of the gear transmission device 304 drives the aperture adjusting part 303 through the transmission groove 103, thereby avoiding the gear transmission device 304 occupying the space inside the discharge pipe 102 and facilitating the control and maintenance of the gear transmission device 304.

[0084] In some embodiments, the adjusting motor 202 and the gear transmission device 304 are both servo motors and are connected to the control mechanism through data lines, which can be remotely controlled by the control mechanism.

[0085] In some embodiments, the control mechanism can be a PLC programmable logic controller.

[0086] In some embodiments, the adjusting motor 202 and the gear transmission device 304 can also be connected to a computer through data lines.

[0087] In some embodiments, the outer circumferential surface of the aperture adjusting part 303 has driven teeth 3033. The driving gear of the gear transmission device 304 meshes with the driven teeth 3033 of the aperture adjusting part 303.

[0088] In some embodiments, the isolation part 301 and the aperture adjusting part 303 are both disc-shaped. The support ring 302 is annular. The outer diameter of the isolation part 301, the outer diameter of the support ring 302, and the outer diameter of the aperture adjusting part 303 are equal. The isolation part 301, the support ring 302, and the aperture adjusting part 303 are all equal to the inner diameter of the transmission channel 1011 of the communication device 1. In the present application, the isolation part 301, the support ring 302, and the aperture adjusting part 303 are all equal to the inner diameter of the transmission channel 1011 of the communication device 1, which can make the isolation part 301 and the support ring 302 completely adhere to and be fixed to the inner wall of the discharge pipe 102, and the outer surface of the aperture adjusting part 303 can also adhere to the inner wall of the discharge pipe 102, facilitating being driven by the gear transmission device 304. The support ring 302 is annular and used to push against the aperture adjusting part 303 from the edge of the aperture adjusting part 303 to limit the aperture adjusting part 303, and enable a large amount of pulverized coal to pass through the inside of the support ring 302. The annular support ring 302 does not affect the passage of the pulverized coal.

[0089] In some embodiments, the number of the misaligned holes 3032 and the number of the powder passing holes 3012 are both plural.

[0090] In some embodiments, the isolation part 301 comprises a filter disc 3011. The filter disc 3011 is fixed in the transmission channel 1011 of the communication device 1, and a plurality of powder passing holes 3012 are formed on the filter disc 3011. The plurality of powder passing holes 3012 can allow the coal powder to pass through, and the coal powder with a particle size larger than the powder passing hole 3012 will be blocked by the filter disc 3011 to avoid that the large-particle coal powder cannot be fully combusted in the burner.

[0091] In some embodiments, the aperture adjusting part 303 comprises a movable disc 3031. The movable disc 3031 is provided with misaligned holes 3032 matched with the powder passing holes 3012.

[0092] In some embodiments, the number of the powder passing holes 3012 and the number of the misaligned holes 3032 are both plural and equal. Optionally, the powder passing holes 3012 and the misaligned holes 3032 are arranged in an array. Since the outer diameter of the movable disc 3031 is equal to that of the filter disc 3011, the distribution rules of the powder passing holes 3012 and the misaligned holes 3032 can be set to be equal. The plurality of powder passing holes 3012 and the plurality of misaligned holes 3032 can be one-to-one corresponding and communicating.

[0093] When the plurality of powder passing holes 3012 and the plurality of misaligned holes 3032 are one-to-one corresponding and coinciding, respectively, the coal powder can pass directly. When the angle of the movable disc 3031 changes, the powder passing holes 3012 and the misaligned holes 3032 will be misaligned, thereby reducing the opening degree of the powder passing holes 3012 and blocking the coal powder with a large particle size, so as to facilitate the control of the particle size of the coal powder entering the burner according to actual needs.

[0094] In some embodiments, the movable disc 3031 is provided with a center positioning shaft 3034 at the surface axis of the isolation part 301. The center positioning shaft 3034 penetrates the axis of the isolation part 301 (specifically, the filter disc 3011) and is rotatably matched with the isolation part 301. Through the cooperation of the center positioning shaft 3034 and the filter disc 3011, the rotation of the movable disc 3031 is more stable, and the rotation deviation caused by uneven force on the movable disc 3031 is avoided.

[0095] In some embodiments, the powder passing hole 3012 is provided with an arc-shaped chamfer 3013 at the opening edge of the feed inlet 1012 of the transmission channel 1011 of the communication device 1. The arc-shaped chamfer 3013 can increase the opening size of the windward surface of the powder passing hole 3012, so that the coal powder can pass through the powder passing hole 3012 better.

[0096] In some embodiments, please refer to Figure 2 、 Figure 3 The coal powder concentration separator 10 further comprises a coarse material separation device 4, as shown in the drawings. The coarse material separation device 4 comprises a coarse material separation pipe 401. The coarse material separation pipe 401 is connected to the transmission channel 1011 of the communication device 1 at a position between the concentration adjustment device 2 and the coarse powder filtering device 3. When large coal powder particles are blocked and accumulated inside the discharge pipe 102, the coarse material separation pipe 401 is provided to make the accumulated coal powder enter the coarse material separation pipe 401 along with the separated gas flow, and under the action of the gas flow, the accumulated coal powder enters the recovery container, so as to avoid the blockage of the discharge pipe 102 and facilitate the recovery and regrinding of the accumulated coal powder.

[0097] In some embodiments, the coarse material separation device 4 further comprises an anti-accumulation chamfer device 402. The anti-accumulation chamfer device 402 is arranged at the opening of the coarse material separation pipe 401 and the transmission channel 1011 of the communication device 1, and protrudes towards the middle of the transmission channel 1011 of the communication device 1. When large coal powder particles are blocked by the isolation part 301, the blocked coal powder particles will slide down to the inside of the coarse material separation pipe 401 along the slope of the anti-accumulation chamfer device 402, and then be driven by the gas flow to be transmitted to the recovery device, which can effectively avoid the blockage of the transmission channel 1011 inside the discharge pipe 102 caused by the accumulation of coal powder.

[0098] In use, the coal powder concentration separator 10 of the present application comprises the following steps:

[0099] The flanges at the ends of the feed pipe 101, the discharge pipe 102 and the coarse material separation pipe 401 are connected to the pneumatic conveying device, the burner and the recovery device, respectively.

[0100] The pneumatic conveying device is controlled to convey coal powder into the inside of the feed pipe 101 by high-speed gas flow, and the coal powder enters the burner for combustion through the gap between the flow control part 201 and the discharge pipe 102, the powder passing hole 3012 and the staggered hole 3032.

[0101] During use, the rotation of the flow control part 201 driven by the adjusting motor 202 is controlled to adjust the included angle between the two flow discs 2011, so as to change the opening of the discharge pipe 102, thereby changing the amount of coal powder that can enter the burner at the same time, and realizing the change of concentration.

[0102] According to the combustion condition in the burner, the angle of the hole diameter adjustment part 303 is adjusted by the gear transmission device 304, so that the powder passing hole 3012 and the staggered hole 3032 are staggered, thereby changing the diameter of the passing coal powder, so as to improve the combustion environment in the burner.

[0103] The coal powder blocked by the isolation part 301 enters the inside of the coarse material separation pipe 401 under the action of the airflow, and is driven by the airflow to the recycling device for recycling, and is ground again.

[0104] In summary, the coal powder concentration separation device 10 has the following beneficial effects:

[0105] (1) The angle of the flow control part 201 is changed to adjust the opening of the transmission channel 1011, and the wind speed is kept unchanged under the condition of coal powder content, which reduces the input of coal powder and ensures uniform coal powder combustion.

[0106] (2) The coal powder in the transmission process passes through the two sides of the air deflector 203, and the windward surface of the tooth column 2012 is shielded by the air deflector 203, which avoids the coal powder from being stuck between the adjacent two tooth columns 2012 during the transmission process, and makes the flow disc 2011 difficult to rotate, thereby improving the flexibility of the flow disc 2011.

[0107] (3) The isolation part 301, the support ring 302 and the aperture adjusting part 303 are installed inside the transmission channel 1011, and the aperture adjusting part 303 is driven to rotate by the gear transmission device 304, the dislocation of the dislocation hole 3032 and the powder passing hole 3012 is controlled by the rotation of the aperture adjusting part 303, and at least part of the aperture adjusting part 303 is communicated, that is, the opening of the powder passing hole 3012 is changed, and the coal powder flux passing through the powder passing hole 3012 is adjusted, thereby achieving the effect of filtering coarse particle coal powder.

[0108] (4) The coarse material separation pipe 401 is provided to recycle the blocked coarse particle coal powder, and the coarse material separation pipe 401 is discharged and recycled under the driving action of the part of the airflow in the coarse material separation pipe 401, and is ground again.

[0109] (5) The anti-accumulation chamfer device 402 is provided to avoid the accumulation of coarse particle coal powder at the pipe opening of the coarse material separation pipe 401 and the transmission channel 1011 of the communication device 1, and to avoid the blockage of the transmission channel 1011.

[0110] (6) The present application effectively overcomes the shortcomings of the prior art and has high industrial utilization value.

[0111] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0112] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application embraces all such possible combinations.

[0113] The above-described embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that, for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A coal dust concentration and separation device, characterized by, The device comprises a communication device and a concentration adjusting device, the communication device is used to connect a pulverized coal conveying device, and has a conveying passage for conveying pulverized coal by airflow; the concentration adjusting device comprises a flow control component and an adjusting driving component, the flow control component is movably connected in the conveying passage of the communication device to adjust the conveying amount of pulverized coal, and the adjusting driving component is connected to the flow control component to drive the flow control component to move and adjust the opening degree of the conveying passage of the communication device.

2. The coal dust concentration / dilution separator according to claim 1, characterized by, The communication device comprises a feeding pipe and a discharging pipe which are in communication with each other, and the feeding pipe is used to connect the pulverized coal conveying device.

3. The coal dust concentration / dilution separator according to claim 2, characterized by, The feeding pipe and the discharging pipe extend along the same axis. And / or, the radial dimension of the feeding pipe is greater than that of the discharging pipe. Optionally, the connecting section between the feeding pipe and the discharging pipe gradually narrows along the airflow direction.

4. The coal dust concentration / dilution separator according to claim 1, characterized by, The flow control component comprises at least two flow discs, a plurality of the flow discs can be spliced to form a shape which is adapted to the section of the conveying passage, and the adjusting driving component is connected to at least one of the flow discs to drive the flow disc to rotate the opening degree of the conveying passage.

5. The coal dust concentration / dilution separator according to claim 4, characterized by The flow disc has a semicircular structure, the section of the conveying passage has a circular shape, and two of the flow discs can be spliced into a circular shape which is equal to the radius of the section of the conveying passage. And / or, the side edges of the adjacent flow discs which abut against each other are provided with tooth columns, the adjacent tooth columns are in meshing with each other, and the tooth columns are rotatably connected to the inner wall of the conveying passage. Optionally, at least one end of the tooth column is provided with a hinged rod which is hinged to the inner wall of the conveying passage, at least one of the hinged rods is connected to the adjusting driving component and can be driven to rotate by the adjusting driving component. Optionally, the concentration adjusting device further comprises a curved air deflector which is located on the surface of the tooth column facing the feeding port of the conveying passage to shield the tooth column. And / or, one side of the flow disc facing the feeding port of the conveying passage is provided with a plurality of impact blades. Optionally, one end of the impact blade facing the feeding port of the conveying passage is provided with a sharp surface.

6. The coal powder concentration-dilution separator according to any one of claims 1 to 5, characterized by The pulverized coal concentration separation device further comprises a coarse powder filtering device which is located downstream of the concentration adjusting device, the coarse powder filtering device comprises a separation part, a support ring and a pore size adjusting part which are sequentially distributed in the conveying passage, and a gear transmission device which is connected to the pore size adjusting part; the pore size adjusting part is penetrated by staggered holes which extend along the airflow direction, the support ring is penetrated by powder passing holes which extend along the airflow direction, the pore size adjusting part is limited between the separation part and the support ring and is rotatably matched with the inner wall of the conveying passage, and the gear transmission device is used to drive the pore size adjusting part to rotate along the axial direction of the conveying passage so that the staggered holes and the powder passing holes can be staggered and at least partially communicated.

7. The coal dust concentration / dilution separator according to claim 6, characterized by The communication device is provided with a transmission groove communicated with the transmission channel, and the aperture adjusting part is partially located in the transmission groove, and the gear transmission part extends into the transmission groove and is connected with the aperture adjusting part; The outer circumferential surface of the aperture adjusting part is provided with driven teeth, and the driving gear of the gear transmission part is engaged with the driven teeth of the aperture adjusting part; The isolation part and the aperture adjusting part are disc-shaped, the support ring is annular, the outer diameter of the isolation part, the outer diameter of the support ring and the outer diameter of the aperture adjusting part are equal, and the isolation part, the support ring and the aperture adjusting part are equal to the inner diameter of the transmission channel; The number of the misclassified holes and the number of the powder passing holes are both multiple.

8. The coal dust concentration / dilution separator according to claim 6, characterized by The isolation part includes a filter disc fixed in the transmission channel, and a plurality of powder passing holes are formed in the filter disc; The aperture adjusting part includes a movable disc, and the movable disc is provided with a plurality of misclassified holes matched with the powder passing holes; Optionally, the surface of the movable disc towards the shaft center of the isolation part is provided with a center positioning shaft, and the center positioning shaft is rotatably connected with the shaft center of the isolation part; The opening edge of the powder passing hole towards the feed inlet of the transmission channel is provided with an arc chamfer.

9. The coal dust concentration / dispersion separator according to claim 6, characterized by The coal powder concentration and dilution separator further comprises a coarse material separation device, and the coarse material separation device comprises a coarse material separation pipe connected to the communication device and communicated with the transmission channel between the concentration adjusting device and the coarse powder filtering device.

10. The coal dust concentration / dilution separator according to claim 9, characterized by The coarse material separation device further comprises an anti-accumulation chamfer device arranged at the pipe opening of the coarse material separation pipe communicated with the transmission channel, and the anti-accumulation chamfer device protrudes towards the middle part of the transmission channel.

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