Modularized detachable dynamic separator

Abstract

The utility model discloses a modularized detachable dynamic separator, which belongs to the technical field of coal pulverizing systems and comprises a combined shell, the combined shell comprises a fixed part and a detachable part, the fixed part is connected with the detachable part through a detachable bottom plate, and the detachable part is formed by butting a pair of half-tube structures; the static impeller is located on the inner side of the detachable part, and one end of the static impeller is detachably connected with the bottom of the detachable bottom plate; and the movable impeller is rotationally positioned on the inner side of the static impeller. The integral separator is decomposed, so that the transportation size is reduced, the requirements on a site factory building gate and transportation space are reduced, and the integral part is decomposed into a plurality of modules, transported, hoisted and installed separately, and then combined. And the working performance of the separator is realized in the combination. The separator of the structure has practical application value in projects without integral transportation and integral installation conditions, and it is guaranteed that the old thermal power plant separator is smoothly modified.

Description

Technical Field

[0001] The utility model belongs to the technical field of pulverizing systems and relates to a modular and detachable dynamic separator. Background Art

[0002] The coal mill is an important auxiliary equipment of the boiler, and the separator is an important device for screening and separating pulverized coal (fineness) in the pulverizing system of the coal mill. With the increasingly frequent change of the coal burned in the power plant boiler, various problems have emerged in the operation of the static separator of the medium-speed coal mill, such as uneven powder distribution in each pulverized coal pipe, relatively coarse pulverized coal fineness, poor regulation performance, poor uniformity, etc., resulting in a large concentration deviation when the pulverized coal transported by each pulverized coal pipe enters the boiler, which is likely to cause uneven temperature in the boiler and affect the safe and stable combustion and operation economy of the boiler. Therefore, more and more old thermal power plants propose to transform the existing static separator of the boiler coal mill on the premise of ensuring the safe and economic operation of the boiler.

[0003] After the static separator is transformed into a dynamic separator, it can remotely adjust the separator speed through the DCS (Distributed Control System) according to the change of the coal quality of the coal burned to obtain the best pulverized coal fineness and pulverized coal uniformity for boiler combustion, increase the peak shaving capacity of the boiler, ensure meeting the needs of users for different pulverized coal fineness, increase the coal type adaptability, be beneficial to the combustion of low NOx burners, and significantly reduce the carbon content in fly ash. However, the existing dynamic separator is assembled and transported as a whole by a housing, a driving part, a rotor, a blanking pipe, a return powder cone, a rotating shaft, a moving vane group ring and a static vane group ring, and it cannot be installed in a narrow space workshop.

[0004] Due to the small size of the plant structure of the old thermal power plant, the plant doors and workshop aisles are narrow, and the lifting capacity of the lifting equipment is limited. For the existing integral dynamic separator, on-site transportation and installation are very difficult. Therefore, it is necessary to adjust the structure of the existing dynamic separator according to different plant conditions to ensure smooth on-site installation. Content of the Utility Model

[0005] In order to at least solve the problem that the integral dynamic separator in the above-mentioned prior art cannot pass through the narrow plant doors and workshop aisles during transportation, the utility model provides the following technical solution: a modular and detachable dynamic separator, the dynamic separator includes:

[0006] A combined housing, the combined housing includes: a fixed part and a detachable part, the fixed part is connected to the detachable part through a detachable bottom plate, and the detachable part is composed of a pair of half-pipe structures butt-jointed;

[0007] A static impeller, the static impeller is located inside the detachable part, and one end of the static impeller is detachably connected to the bottom of the detachable bottom plate; and

[0008] The impeller rotates inside the stationary impeller.

[0009] Optionally, in the above modular detachable dynamic separator, the maximum diameter of the detachable bottom plate and / or the detachable part is greater than the maximum diameter of the fixed part.

[0010] Optionally, in the above modular detachable dynamic separator, the fixed part is the upper housing, and a powder outlet is provided upward on the side wall of the upper housing. The upper housing is connected to the detachable bottom plate through a connecting member.

[0011] Optionally, in the above modular detachable dynamic separator, the detachable part includes: a middle housing and a lower housing;

[0012] Both the middle housing and the lower housing are composed of a pair of half-tube structures butt-jointed. One end of the middle housing is detachably connected to the detachable bottom plate, and the other end of the middle housing is detachably connected to the lower housing. The impeller is arranged inside the middle housing.

[0013] Optionally, in the above modular detachable dynamic separator, an upper flange is circumferentially arranged at the other end of the middle housing;

[0014] A lower flange is circumferentially arranged at one end of the lower housing;

[0015] The upper flange is connected to the lower flange by bolts.

[0016] Optionally, in the above modular detachable dynamic separator, the detachable bottom plate includes: a first bottom plate provided with through holes and second bottom plates located on both sides of the first bottom plate, and the outer shape is annular;

[0017] The first bottom plate and the second bottom plates are detachably connected.

[0018] Optionally, in the above modular detachable dynamic separator, the first bottom plate and the second bottom plates are connected by hinges;

[0019] One end of the hinge is fixed to the first bottom plate by bolts, and the other end of the hinge is fixed to the second bottom plate by bolts.

[0020] Optionally, in the above modular detachable dynamic separator, the impeller includes: a rotor impeller, dynamic blades, and a hollow rotating shaft;

[0021] One end of the hollow rotating shaft is connected to the driving part located outside the fixed part, and the other end of the hollow rotating shaft extends into the detachable part;

[0022] The rotor impeller is sleeved on the hollow rotating shaft below the detachable bottom plate, and a plurality of moving blades are circumferentially arranged on the side wall of the rotor impeller;

[0023] The moving blades are divided into upper and lower layers, and the moving blades are detachably connected to the rotor impeller.

[0024] Optionally, in the above-mentioned modular detachable dynamic separator, the static impeller includes: static blades and a powder return cone;

[0025] The static blades are vertically located in the middle shell body, and a plurality of the static blades are evenly distributed along the circumference of the moving impeller. One end of the static blade is detachably connected to the bottom of the detachable bottom plate, and the other end of the static blade is detachably connected to the powder return cone;

[0026] The powder return cone is located in the lower shell body.

[0027] Optionally, in the above-mentioned modular detachable dynamic separator, the dynamic separator further includes: a blanking pipe spliced in multiple axial segments;

[0028] One end of the blanking pipe extends into the hollow rotating shaft.

[0029] The beneficial effects brought by the technical solution provided by the embodiment of the present invention are:

[0030] This application decomposes the integral separator into a combined shell, a static impeller and a dynamic impeller, divides the combined shell into a fixed part and a detachable part, reduces the impact of the height of the factory building door and the workshop aisle on transportation, and divides the detachable part into two halves, which can reduce the transportation size. At the same time, the requirements for the on-site factory building door and the on-site transportation space are reduced. It realizes the decomposition of the integral components into multiple modules, separate transportation, separate hoisting, separate installation, and then realizes combination. The working performance of the separator is realized during the combination. This kind of separator has practical application value in projects that do not have the conditions for overall transportation and overall installation, and ensures the smooth progress of the separator transformation work in old thermal power plants. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of a modular detachable dynamic separator provided by an embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of the connection method between the middle shell and the lower shell of a modular detachable dynamic separator provided by an embodiment of the present invention;

[0033] Figure 3 It is a schematic bottom view structure diagram of the fixed part (with a detachable bottom plate) in a modular detachable dynamic separator provided by an embodiment of the present invention;

[0034] In the figure: 1. Upper housing; 101. Powder outlet pipe; 2. Middle housing; 3. Lower housing; 4. Removable bottom plate; 401. First bottom plate; 402. Second bottom plate; 5. Static impeller; 501. Static vane; 502. Powder return cone; 6. Dynamic impeller; 601. Hollow rotating shaft; 602. Dynamic vane; 603. Rotor impeller; 7. Feed pipe; 8. Driving part; 9. Hinge; 10. Bolt; 11. Sealed air pipeline. Detailed implementation mode

[0035] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the following will further describe in detail the implementation modes of the present utility model with reference to the accompanying drawings.

[0036] In the description of the present utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and does not require the present utility model to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. The terms "connected", "connected to", and "disposed" used in the present utility model should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component; it can be a wired connection, a radio connection, or a wireless communication signal connection. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0037] Please refer to Figures 1-3, the present utility model provides the following technical solutions: a modular and detachable dynamic separator, which solves the problem that the existing integral dynamic separator cannot pass through the narrow doors and workshop aisles of old thermal power plants. In this application, the dynamic separator is divided into multiple modules, including: a combined housing, a static impeller 5, and a dynamic impeller 6. Among them, the combined housing includes: a fixed part and a detachable part. By decomposing the combined housing into two parts in terms of height, the influence of the height of the factory building door and workshop aisle on transportation can be reduced. The fixed part refers to the housing part that cannot be disassembled, and the detachable part refers to the housing part that can be disassembled and assembled. The detachable part is composed of a pair of half-tube structures docked to form a complete tube structure. It can be understood that the two components of the detachable part are detachably connected, which is convenient for split transportation and is suitable for the narrow maintenance channels of old factory buildings. The fixed part is connected to the detachable part (after docking) through a detachable bottom plate 4, such as a detachable connection. Preferably, the maximum diameter of the detachable bottom plate 4 and / or the detachable part is greater than the maximum diameter of the fixed part. Compared with the fixed part, normally, the detachable bottom plate 4 and / or the detachable part also have higher requirements for transportation space, so it is necessary to adopt a detachable method for the detachable bottom plate 4 and / or the detachable part. The static impeller 5 is located inside the detachable part, and at the same time, one end of the static impeller 5 is detachably connected to the bottom of the detachable bottom plate 4, such as by bolts. The dynamic impeller 6 rotates inside the static impeller 5 and is arranged concentrically with the static impeller 5. The rotation of the dynamic impeller 6 can be realized by a motor, and this embodiment does not limit the motor. It should be noted that the detachable part adopts a split design because the maximum diameter position of the dynamic separator is located on the detachable part. Dividing the split part into two halves can reduce the transportation size and at the same time reduce the requirements for the factory building door and on-site transportation space. Before the equipment passes through the narrow factory building door and workshop aisle, the splitting work is carried out first, and the specific operations are as follows: separately separate the fixed part from the detachable bottom plate 4 and remove the fixed part, separate the detachable part from the detachable bottom plate 4, separate the two components in the detachable part and move them away from both sides of the static impeller 5, so that the maximum diameter of the dynamic separator can be reduced. Separate the static impeller 5 from the detachable bottom plate 4 and remove the detachable bottom plate 4, and take out the dynamic impeller 6 from inside the static impeller 5. The splitting work is completed. With the help of a lifting device, each component is transported through the factory building door and workshop aisle. After reaching the designated installation position, reverse the above steps for assembly. This application realizes the full disassembly and reassembly of the dynamic separator through a modular and detachable structure, which is convenient for maintenance or on-site experiments, ensures that the dynamic and static combined separator can be successfully hoisted in a narrow space factory building, and ensures the smooth progress of the transformation work of old thermal power plants.

[0038] Refer to Figure 1As shown, the fixed part refers to the upper part of the housing, simply referred to as the upper housing 1, also known as the expanded distribution box. There is a powder outlet on the side wall of the upper housing 1. Preferably, a powder outlet pipe 101 (also called the outlet inclined pipe) is arranged on the side wall of the upper housing 1 in an upward inclined manner. After the qualified fine particles enter the rotating impeller 6, they continuously rise with the airflow, enter the inner cavity of the upper housing 1 through the powder outlet pipe 101, and leave the separator from the port of the powder outlet pipe 101. Preferably, an anti-wear plate is arranged inside the powder outlet pipe 101. The upper housing 1 is connected to the detachable bottom plate 4 through connecting parts (such as bolts, etc.).

[0039] Referring to Figure 2 As shown, the detachable part includes: the middle housing 2 and the lower housing 3. The detachable part is a split structure up and down, which is convenient for split transportation and can reduce the impact of the height of the factory building door and the workshop aisle on transportation. Both the middle housing 2 and the lower housing 3 are composed of a pair of semi-tube structures butt-jointed. One end of the middle housing 2 is detachably connected to the detachable bottom plate 4, such as by bolts 10. The other end of the middle housing 2 is detachably connected to the lower housing 3, such as by flange connection. Specifically, an upper flange is arranged circumferentially at the other end of the middle housing 2, and a lower flange is arranged circumferentially at one end of the lower housing 3. The upper flange and the lower flange are connected by bolts 10. A moving impeller 6 is arranged inside the middle housing 2.

[0040] Referring to Figure 3 As shown, the detachable bottom plate 4 includes: a first bottom plate 401 provided with through holes and second bottom plates 402 located on both sides of the first bottom plate 401, and the outer shape is annular. The first bottom plate 401 and the second bottom plates 402 are detachably connected, such as through connecting parts. When the on-site transportation passage does not meet the size requirements of the separator, the method of using the detachable bottom plate 4 can ensure the smooth transportation and later maintenance of the separator. Preferably, the first bottom plate 401 and the second bottom plates 402 are connected by hinges 9. One end of the hinge 9 is fixed to the first bottom plate 401 by bolts, and the other end of the hinge 9 is fixed to the second bottom plates 402 by bolts. The hinge 9 commonly used in the art can be used. In other embodiments, connecting plates can also be respectively arranged on the first bottom plate 401 and the second bottom plates 402, holes are drilled in the connecting plates, and bolts are passed through the holes and fixed with nuts. The connection method of the three split bottom plates is applicable to the narrow maintenance passage of the old factory building. Removing the two second bottom plates 402 from the first bottom plate 401 can widen the maintenance passage. In addition, it should be noted that since the moving impeller 6 is located below the through hole of the first bottom plate 401, the size of the through hole should meet the installation of the hollow rotating shaft 601 in the moving impeller 6 and ensure that the qualified fine particles separated by the moving impeller 6 can pass through smoothly.

[0041] As an embodiment of the specific structure of the above-mentioned impeller 6, in this embodiment, the impeller 6 includes: a rotor impeller 603, moving blades 602, and a hollow rotating shaft 601. Specifically, one end of the hollow rotating shaft 601 is connected to the driving part 8 located outside the fixed part. The driving part 8 includes: a gear pair, a motor, a coupling, and a hollow turntable. The motor is a variable-frequency motor. The two gears in the gear pair are meshed with each other. The output shaft of the motor is connected to one of the gears in the gear pair through a coupling. The other gear in the gear pair is sleeved on the hollow turntable, and the hollow turntable is sleeved on the hollow rotating shaft 601. In this way, the driving part 8 can drive the rotor impeller 603 on the hollow rotating shaft 601 to rotate, and the rotation speed of the rotor impeller 603 can also be controlled by a frequency converter. It should be noted that the housing of the driving part 8 is of a welded structure, which has a higher finished product rate than the casting structure and does not leak oil. The other end of the hollow rotating shaft 601 penetrates into the through hole of the detachable bottom plate 4 and extends downward into the splitting part. The rotor impeller 603 is sleeved on the hollow rotating shaft 601 below the detachable bottom plate 4. Preferably, flange plates are provided at the connection between the hollow rotating shaft 601 and the rotor impeller 603, and the taper pins used to fasten the two flange plates are locked with single-ear stop washers. At the same time, the side wall of the rotor impeller 603 is in the form of a louver, and a plurality of vertically arranged moving blades 602 are circumferentially arranged. The rotor impeller 603 can drive the moving blades 602 to rotate while rotating. These moving blades 602 are divided into upper and lower layers. That is to say, for structural stability, two circles of moving blades 602 are arranged on the rotor impeller 603 to ensure the rigidity of the rotating cage. Each circle of moving blades 602 can be 60 pieces, or can be set according to actual needs. This embodiment does not limit it. Each moving blade 602 is detachably connected to the rotor impeller 603, such as through bolts 10. In this way, after the moving blades 602 are worn on site, the moving blades 602 can be replaced separately, or the entire impeller 6 can be replaced.

[0042] As an embodiment of the specific structure of the above-mentioned static impeller 5, in this embodiment, the static impeller 5 includes: static blades 501 and a powder return cone 502. Specifically, the static blades 501 are vertically located in the middle housing 2. There is a conical space between the static impeller 5 and the middle housing 2 with a gradually decreasing annular cross-sectional area from bottom to top. The conical space gradually increases the pressure of the air-powder flow and can better pass through the gap between adjacent static blades 501. A plurality of static blades 501 are evenly distributed along the circumference of the impeller 6. One end of each static blade 501 is detachably connected to the bottom of the detachable bottom plate 4, such as through bolts, and the other end of each static blade 501 is detachably connected to the powder return cone 502, such as through a connecting plate by bolts. In this way, on-site maintenance can be facilitated. After the static blades 502 are worn on site, only the worn static blades 502 need to be replaced. The powder return cone 502 is located in the lower housing 3. Since the hollow rotating shaft 601 in the impeller 6 is connected to the driving part 8, if maintenance and disassembly are required, the impeller 6 can be dropped into the powder return cone 502.

[0043] Reference Figure 1 As shown, the dynamic separator further includes a blanking pipe 7 spliced axially in multiple sections. It can be installed section by section on-site, which can reduce the overall installation height for disassembly and assembly. One end of the spliced blanking pipe 7 extends into the hollow rotating shaft 601 for blanking. Preferably, the blanking pipe 7 assembly is butt-jointed through an outer flange.

[0044] To prevent material particles from entering the gear pair of the driving part 8, the dynamic separator further includes a sealing mechanism. Specifically, the sealing mechanism includes a sealing air pipeline 11 and an air seal ring (not shown in the figure). The air seal ring is located between the blanking pipe 7 and the hollow rotating shaft 601, and between the hollow rotating shaft 601 and the top plate of the combined housing. The sealing air pipeline 11 is used to convey sealing air to the air side of the air seal ring. It should be noted that the air side of the air seal ring refers to the side in contact with the sealing air, while the other side of the air seal ring (i.e., the air-powder side) refers to the side in contact with the air-powder flow inside the machine body.

[0045] Taking coal as an example of the raw material, the working principle of the dynamic separator of the present application is explained as follows:

[0046] The dynamic separator is driven by a variable-frequency motor through a coupling to drive the gear pair in the driving part 8 to rotate, thereby driving the hollow rotating shaft 601 and the connected rotor impeller 603 to rotate. The rotor impeller 603 drives the circumferential moving blades 602 to rotate, and the coal is dropped onto the grinding table of the coal mill through the blanking pipe 7. Primary air is introduced into the inlet of the coal mill. The primary air passes through the rotating nozzle ring and blows up the milled coal powder particles on the grinding table of the coal mill to form an annular rotating air-powder flow. The air-powder flow spirally rises in the shell and vertically flows through the gravity separation area, and then radially (towards the direction of the rotor impeller 603) flows into the static blade 501 group ring arranged vertically. The static blade 501 group and the conical space between the middle housing 2 have a gradually decreasing annular cross-sectional area from bottom to top, resulting in a gradually increasing pressure of the air-powder flow, enabling the air-powder flow to be directionally accelerated, and a directional and uniform air-powder flow can be obtained. The coarse particles are separated and escape along the tangent direction of the rotating moving blades 602 under the centrifugal force of the moving impeller 6. The relatively coarse coal powder particles separated are returned to the coal mill through the return powder cone 502 for re-grinding, and the qualified fine particles enter the rotating moving impeller 6 and then enter the powder outlet through the expansion type distribution box (upper housing 1). The higher the rotational speed of the rotor impeller 603, the finer the coal powder. By changing the rotational speed of the rotor impeller 603 through the frequency converter, the requirements for different finenesses of the coal powder are met, and automatic and remote speed regulation can be achieved.

[0047] As is known by technical common sense, the present utility model can be implemented by other embodiments without departing from its spiritual essence or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and are not exclusive. All changes within the scope of the present utility model or equivalent to the present utility model are encompassed by the present utility model.

Claims

1. A modular detachable dynamic separator, characterized in that: The dynamic separator comprises: A combined shell, the combined shell comprising: a fixed part and a split part, the fixed part is connected to the split part through a detachable bottom plate, and the split part is composed of a pair of half-pipe structures connected together; a stationary impeller, the stationary impeller being located inside the split portion, one end of the stationary impeller being detachably connected to the bottom of the detachable bottom plate; and The moving impeller is rotatably located inside the stationary impeller.

2. The modular detachable dynamic separator according to claim 1, characterized in that: The maximum diameter of the detachable bottom plate and / or the detachable portion is greater than the maximum diameter of the fixed portion.

3. The modular detachable dynamic separator according to claim 1, characterized in that: The fixed part is an upper shell, a side wall of the upper shell is upwardly provided with a powder outlet, and the upper shell is connected to the detachable bottom plate through a connecting piece.

4. The modular detachable dynamic separator according to claim 1, characterized in that: The splitting part comprises: a middle shell and a lower shell; The middle shell and the lower shell are both formed by a pair of half-tube structures connected together, one end of the middle shell is detachably connected to the detachable bottom plate, and the other end of the middle shell is detachably connected to the lower shell, and the impeller is arranged in the middle shell.

5. The modular detachable dynamic separator according to claim 4, characterized in that: An upper flange is circumferentially arranged at the other end of the middle shell; A lower flange is circumferentially provided at one end of the lower shell; The upper flange is connected to the lower flange by bolts.

6. The modular detachable dynamic separator according to claim 1, characterized in that: The detachable bottom plate comprises: a first bottom plate provided with through holes and a second bottom plate located on both sides of the first bottom plate, and the shape is annular; The first bottom plate and the second bottom plate are detachably connected.

7. The modular detachable dynamic separator according to claim 6, characterized in that: The first bottom plate and the second bottom plate are connected by a hinge; One end of the hinge is fixed to the first bottom plate by bolts, and the other end of the hinge is fixed to the second bottom plate by bolts.

8. The modular detachable dynamic separator according to claim 1, characterized in that: The impeller comprises: a rotor impeller, impeller blades and a hollow shaft; One end of the hollow shaft is connected to the driving part located outside the fixing part, and the other end of the hollow shaft extends into the splitting part; The rotor impeller is sleeved on the hollow rotating shaft below the detachable bottom plate, and a plurality of moving blades are circumferentially arranged on the side wall of the rotor impeller; The moving blades are divided into two layers, an upper layer and a lower layer, and the moving blades are detachably connected to the rotor impeller.

9. The modular detachable dynamic separator according to claim 4, characterized in that: The stationary impeller comprises: stationary blades and a powder return cone; The stationary blades are vertically located in the middle casing, and a plurality of the stationary blades are evenly distributed along the circumference of the impeller. One end of the stationary blades is detachably connected to the bottom of the detachable bottom plate, and the other end of the stationary blades is detachably connected to the powder return cone. The powder return cone is located in the lower shell body.

10. The modular detachable dynamic separator according to claim 8, characterized in that: The dynamic separator also includes: a drop pipe with multiple sections spliced ​​axially; One end of the blanking pipe extends into the hollow rotating shaft.

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