A long-distance screw conveying device and coal powder conveying system

Abstract

The present invention relates to the technical field of coal powder conveying, and in particular to a long-distance screw conveying device and a coal powder conveying system, comprising a supporting mechanism, the supporting mechanism comprising a supporting component; a driving mechanism, which is arranged on the supporting component; a conveying mechanism, comprising a spiral body, the spiral body is connected to the driving mechanism, a shell is arranged on the spiral body, and a feed port and a discharge port are arranged on the shell; a connecting mechanism, comprising a sealing component and a connecting component, and the sealing component and the connecting component are arranged on the spiral body; the present invention enables the spiral body to meet the demand of long-distance transportation through the arrangement of the connecting mechanism, and the air-tight performance of the sealing component improves the operating stability of the present invention, and due to the arrangement of the longitudinal conveying device, the transverse conveying device and the control mechanism, the present invention can operate stably for a long time, convey coal powder over a long distance, and has a wider range of applicability, thereby ensuring the stability of coal powder supply in the coal powder conveying system.

Description

Technical Field

[0001] The invention relates to the technical field of coal powder conveying, in particular to a long-distance screw conveying device and a coal powder conveying system. Background Art

[0002] In the chemical and power industries, raw coal needs to be ground to the required particle size by a coal mill and then transported to the furnace for combustion through a coal powder conveying system. The coal powder conveying system of each factory usually uses a screw conveyor for conveying in the intermediate section. As a key equipment for conveying coal powder, the screw conveyor plays the role of connecting the coal powder bin and the coal powder collector in the coal grinding and drying device. In the current domestic coal gasification process, whether it is SHELL, GSP or other types of gasification devices, they are widely used. Due to the different sizes of combustion furnaces and the different amounts of coal powder required, different units will be equipped with different numbers and processing capacities of coal mills. Due to the different numbers of coal mills and different operating modes (one open and one standby, two open and one standby, etc.), the coal powder conveying systems are also different. The coal powder conveying system is responsible for providing fuel for the combustion furnace. Once the coal is cut off, the combustion furnace will have to be extinguished and forced to stop operation. The stable operation of the coal powder conveying system is particularly important. At the same time, the ways of supplying the fuel required by the coal burner of various types of gasifiers are different, including pressurized conveying, normal pressure conveying, water-coal slurry conveying, etc.

[0003] Huaneng IGCC Power Station uses a two-stage dry pulverized coal pressurized gasifier with independent intellectual property rights, commonly known as the "Huaneng furnace". This type of gasifier is divided into two burner groups, with 4 burners in the first stage and 2 burners in the second stage, a total of 6 burners, corresponding to 6 coal lines. The 6 burners are supplied with pulverized coal by 6 coal lines, and a total of 3 sets of pulverized coal pressurized conveying devices supply 6 coal lines, and each set of pressurized conveying devices supplies 2 coal lines. All pulverized coal is supplied by 3 coal mills, two in operation and one in standby. In order to supply the pulverized coal ground by the two coal mills to the 3 sets of pressurized conveying devices, an efficient and reliable pulverized coal distribution system is required.

[0004] Screw conveyors, as common coal conveying devices, are used in the coal powder distribution system of the "Huaneng Furnace". During the coal powder conveying process, screw conveyors have the characteristics of low speed, high stability and good economy. However, based on the actual situation on site, the existing screw conveyor models cannot meet the transportation needs. Summary of the invention

[0005] In view of the above-mentioned problem or the problem in the prior art that the transport distance of the screw conveyor is limited, the present invention is proposed.

[0006] Therefore, an object of the present invention is to provide a long-distance screw conveying device.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a supporting mechanism, including a supporting component, the supporting component including at least two supporting frames; a driving mechanism, arranged on the supporting component; a conveying mechanism, including a spiral body, the spiral body is connected to the driving mechanism, the spiral body is provided with a shell, and the shell is provided with a feed port and a discharge port; a connecting mechanism, including a sealing component and a connecting component, the sealing component and the connecting component are arranged on the spiral body.

[0008] As a preferred solution of the long-distance screw conveying device of the present invention, the sealing component includes a rotating shaft, a bearing is circumferentially arranged on the rotating shaft, a bearing end cover is circumferentially arranged on the bearing, a seal is arranged between the rotating shaft and the bearing end cover, and pressure covers are arranged at both ends of the seal; a connecting hole is opened in the rotating shaft.

[0009] As a preferred solution of the long-distance screw conveying device of the present invention, an air-sealing channel is provided between the bearing end cover and the sealing member.

[0010] As a preferred solution of the long-distance screw conveying device of the present invention, the sealing component further includes an annular support and a connecting rod, wherein the annular support is arranged around the outer side of the bearing, and the connecting rod passes through the bearing end cover and is arranged between the annular support and the bearing.

[0011] As a preferred solution of the long-distance screw conveying device of the present invention, there are at least three connecting rods, and an air intake channel is opened inside one of the connecting rods.

[0012] As a preferred solution of the long-distance screw conveying device of the present invention, an exhaust channel is opened inside the bearing end cover, one end of the exhaust channel is connected to the air inlet channel, and the other end is connected to the air sealing channel.

[0013] As a preferred solution of the long-distance screw conveying device of the present invention, wherein: the connecting component includes a flange, a connecting shaft is provided on one side of the flange, and the connecting shaft is adapted to the connecting hole.

[0014] Beneficial effects of the long-distance screw conveying device of the present invention: The present invention realizes long-distance conveying of the screw body by setting up sealing components and connecting components, which can not only realize the fixed connection and synchronous rotation of the screw body, but also prevent dust and other impurities from entering the bearing.

[0015] In actual use, there is still a problem of unstable coal powder supply in the two-stage dry coal powder pressurized gasification furnace.

[0016] To solve the above technical problems, the present invention also provides the following technical solutions: a coal powder conveying system, including a long-distance screw conveying device, and a coal conveying control mechanism, including a coal outlet pipe of a coal mill, a tee is provided at the lower end of the coal outlet pipe of the coal mill, and the tee is respectively connected to a first coal inlet branch pipe and a second coal inlet branch pipe.

[0017] As a preferred solution of the pulverized coal conveying system of the present invention, the coal conveying control mechanism further includes a three-way valve and a gate valve; the three-way valve is arranged on the three-way valve, and the gate valve is arranged on the first coal inlet branch pipe.

[0018] As a preferred solution of the coal powder conveying system of the present invention, it comprises at least three groups of the long-distance screw conveying devices, which are respectively arranged in at least two groups in the longitudinal direction and one group in the transverse direction; the long-distance screw conveying devices arranged in the longitudinal direction are respectively connected to the coal conveying control mechanism, the first coal inlet branch pipe and the second coal inlet branch pipe are respectively connected to the shell, and the long-distance screw conveying devices arranged in the transverse direction are respectively connected to the first coal inlet branch pipe in sequence.

[0019] The beneficial effects of the coal powder conveying system of the present invention: the present invention enables the spiral to meet the needs of long-distance transportation through the setting of the connecting mechanism, and the air-tight performance of the sealing component improves the stability of the operation of the present invention. Due to the setting of the longitudinal conveying device, the transverse conveying device and the control mechanism, the present invention can operate stably for a long time, convey coal powder over a long distance, and has a wider applicability, thereby ensuring the stability of the coal powder supply of the coal powder conveying system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is an overall schematic diagram of a long-distance screw conveying device.

[0022] Figure 2 This is the front view of the connecting mechanism.

[0023] Figure 3 for Figure 2 AA section view.

[0024] Figure 4 The overall structure of the pulverized coal conveying system is shown in FIG. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Example 1, reference Figure 1 , which is the first embodiment of the present invention, provides a long-distance spiral conveying device.

[0029] Specifically, it includes a support mechanism 100, and the support mechanism 100 includes a support component 101; in this embodiment, the support component 101 includes a first support frame 101a, a second support frame 101b and a third support frame 101c.

[0030] It also includes a driving mechanism 200, which includes a motor 201, a reducer 202 and a coupling 203. The motor 201 and the reducer 202 are fixedly connected to the first support frame 101a, and the coupling 203 is fixedly connected to the second support frame 101b. The motor 201 provides power for the conveying mechanism 300.

[0031] Furthermore, it also includes a conveying mechanism 300, which includes a screw 301, and the screw 301 is connected to the coupling 203, and the other end of the screw 301 is rotatably supported on the third support frame 101c, and the screw 301 pushes the material for transportation through self-rotation.

[0032] The outer periphery of the spiral body 301 is provided with a shell 302, and the spiral body 301 is sealed and connected therein by the shell 302. The shell 302 is used to contain the conveyed material. The shell 302 is provided with a feed port 303 and a discharge port 304 for receiving and discharging the material.

[0033] When in use, the material is put into the conveying mechanism 300 from the feed port 303 , the motor 201 drives the screw body 301 to rotate, the material is driven by the screw body 301 to move toward the discharge port 304 , and is discharged through the discharge port 304 .

[0034] Example 2, reference Figures 2-3 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a connection structure for a long-distance screw conveying device, solving the problem that the screw conveying device is not convenient for long-distance transportation.

[0035] It includes a connecting mechanism 400, which includes a sealing component 401 and a connecting component 402. The sealing component 401 is fixedly connected to the shell 302, one end of the connecting component 402 is fixedly connected to the spiral body 301, and the other end is fixedly connected to the sealing component 401. The two sections of the spiral body 301 can be connected as a whole through the connecting mechanism 400.

[0036] Specifically, the sealing component 401 includes a rotating shaft 401a, on which a bearing 401b is installed, and the rotating shaft 401a can rotate in the bearing 401b; a bearing end cover 401d is circumferentially arranged on the bearing 401b, and a seal 401c is installed between the rotating shaft 401a and the bearing end cover 401d, and the seal 401c is used to prevent the leakage of lubricating oil in the bearing 401b, and prevent dust and other impurities from entering between the bearing 401b and the rotating shaft 401a; the bearing end cover 401d is used to fix the seal 401c and protect the bearing 401b; pressure covers 401e are installed at both ends of the seal 401c, and the pressure cover 401e is used to fix and protect the seal 401c.

[0037] A connecting hole 401 k is defined in the rotating shaft 401 a . In the present embodiment, the connecting hole 401 k is configured as a through hole, and its cross section is a square.

[0038] It should be noted that the bearing end cover 401d and the seal 401c are not tightly fitted, but an air sealing channel 401j is reserved between the two through size design to facilitate the sealing gas to spray out therefrom, forming an annular sealing airflow in the axial direction of the bearing end cover 401d.

[0039] Furthermore, the sealing component 401 also includes an annular support 401f and a connecting rod 401g. The annular support 401f is arranged around the outer side of the bearing 401b, and the connecting rod 401g passes through the bearing end cover 401d and is arranged between the annular support 401f and the bearing 401b.

[0040] Among them, the annular support 401f is welded and connected to the shell 302, and the connecting rods 401g are set to at least three, one of which has an air inlet channel 401h inside, and the other connecting rod 401g has an oil inlet channel inside, and the grease introduced is used to lubricate the bearing 401b; the sealing component 401 also includes an oil outlet pipe, which is used to discharge the waste lubricating oil.

[0041] Furthermore, an exhaust channel 401i is opened inside the bearing end cover 401d, and the opening position of the exhaust channel 401i is suitable for connecting with the air inlet channel 401h at one end and connecting with the air sealing channel 401j at the other end after installation, so as to transport the sealing gas entering the air inlet channel 401h to the air sealing channel 401j.

[0042] The connecting component 402 includes a flange 402a, and a connecting shaft 402b is welded or integrally processed on one side of the flange 402a. The cross-section of the connecting shaft 402b and the cross-section of the connecting hole 401k are processed in a 1:1 ratio, so that after the connecting shaft 402b is inserted into the connecting hole 401k, the connecting shaft 402b is fixedly connected to the rotating shaft 401a, and the rotating shaft 401a rotates synchronously with the connecting shaft 402b.

[0043] Preferably, in order to facilitate the matching of the connecting component 402 and the sealing component 401, a step surface is processed between the flange 402a and the connecting shaft 402b. When the connecting shaft 402b is inserted into the connecting hole 401k, the step surface abuts against the side wall of the connecting hole 401k, which is convenient for observing and controlling the insertion distance of the connecting shaft 402b.

[0044] The rest of the structure is the same as that of Example 1.

[0045] When in use, taking the connection between two sections of the spiral body 301 as an example, first, the opposite ends of the two sections of the spiral body 301 are bolted to the flanges 402a of the two connecting parts 402, so that the connecting shafts 402b of the two connecting parts 402 are opposite; then the two connecting shafts 402b are simultaneously plugged and fixedly connected to the two ends of the connecting hole 401k, and finally the annular support 401f is welded to the shell 302, completing the fixed connection of the two sections of the spiral body 301 and meeting the requirements of synchronous rotation at the same time.

[0046] In summary, by providing the sealing component 401 and the connecting component 402, long-distance transportation of the spiral body 301 is achieved, which can not only realize the fixed connection and synchronous rotation of the spiral body 301, but also prevent dust and other impurities from entering the bearing.

[0047] Example 3, reference Figure 4 , which is the third embodiment of the present invention. Different from the previous embodiment, this embodiment provides a coal powder conveying system, which solves the problem of low supply efficiency of coal powder ground by the coal mill to the pressurized conveying device, including the long-distance screw conveying device in the above embodiment.

[0048] Specifically, in this embodiment, three groups of longitudinal long-distance screw conveying devices are arranged, which are respectively arranged as the first longitudinal conveying device I, the second longitudinal conveying device II, and the third longitudinal conveying device III; one transverse group is arranged as the transverse conveying device IV, and the three groups of longitudinal long-distance screw conveying devices are arranged at intervals, corresponding to the three sets of pressurized conveying devices respectively.

[0049] It also includes a coal conveying control mechanism 500, and each group of longitudinal long-distance screw conveying devices is provided with a group of coal conveying control mechanisms 500.

[0050] The coal conveying control mechanism 500 includes a coal mill coal outlet pipe 501, the top of which is connected to a coal mill, the lower end of the coal mill coal outlet pipe 501 is connected to a tee 502, and the bypasses on both sides of the tee 502 are respectively connected to a first coal inlet branch pipe 504 and a second coal inlet branch pipe 505, and the first coal inlet branch pipe 504 and the second coal inlet branch pipe 505 are respectively connected to the shell 302.

[0051] The coal conveying control mechanism 500 further includes a three-way valve 503 and a gate valve 506 .

[0052] Among them, the three-way valve 503 is arranged on the tee 502 to control the opening and closing of the first coal inlet branch pipe 504 and the second coal inlet branch pipe 505; the gate valve 506 is arranged on the first coal inlet branch pipe 504 to control the connection or disconnection between the first coal inlet branch pipe 504 and the horizontal conveying device IV.

[0053] Furthermore, when the gate valve 506 is arranged on the first coal inlet branch pipe 504, the transverse conveying device IV is connected with the first coal inlet branch pipe 504 on each longitudinal conveying device in sequence to balance the coal powder supply to the three sets of pressurized conveying devices.

[0054] Alternatively, when the gate valve 506 is arranged on the second coal inlet branch pipe 505, the transverse conveying device IV is connected with the second coal inlet branch pipe 505 on each longitudinal conveying device in sequence to balance the coal powder supply to the three sets of pressurized conveying devices.

[0055] The rest of the structure is the same as that of Example 2.

[0056] When in use, the gate valve 506 is provided on the first coal inlet branch pipe 504 as an example for description:

[0057] If the coal mills connected to the first longitudinal conveying device I, the second longitudinal conveying device II, and the third longitudinal conveying device III are all opened, so that the amount of coal powder transported by the three is stable, then the three-way valve 503 is controlled to close the first coal inlet branch pipe 504, and the coal powder falls into the second coal inlet branch pipe 505 respectively.

[0058] If the coal mill of the first longitudinal conveying device I is in a closed state, resulting in the first longitudinal conveying device I being unable to supply sufficient coal powder to the downstream coal powder pressure conveying device, the three-way valve 503 of the second longitudinal conveying device II is controlled to open the first coal inlet branch pipe 504 and the second coal inlet branch pipe 505 of the second longitudinal conveying device II at the same time, and at the same time, the gate valve 506 of the second longitudinal conveying device II is closed and the gate valve 506 of the first longitudinal conveying device I is opened, so that the coal powder falling from the first coal inlet branch pipe 504 of the second longitudinal conveying device II enters the transverse conveying device IV, and the operating direction of the transverse conveying device IV is controlled to transport the coal powder to the first longitudinal conveying device I and drop along the first coal inlet branch pipe 504 of the first longitudinal conveying device I, thereby satisfying the requirement that the first longitudinal conveying device I supply sufficient coal powder to its downstream coal powder pressure conveying device.

[0059] When the coal mill corresponding to the second longitudinal conveying device II or the third longitudinal conveying device III is closed, coal powder can be transferred from other longitudinal conveying devices in the above-mentioned manner.

[0060] It should be noted that the transverse conveying device IV is configured for bidirectional transmission.

[0061] In summary, the present invention enables the spiral body 301 to meet the needs of long-distance transportation through the setting of the connecting mechanism 400, and the air-tight performance of the sealing component 401 improves the stability of the operation of the present invention. Due to the setting of the longitudinal conveying device, the transverse conveying device and the control mechanism, the present invention can operate stably for a long time, convey coal powder over a long distance, and has a wider applicability, thereby ensuring the stability of the coal powder supply of the coal powder conveying system.

[0062] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0063] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention).

[0064] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A long distance screw conveying device, characterized in that: include, A support mechanism (100) comprises a support component (101), wherein the support component (101) comprises at least two support frames; A driving mechanism (200) is arranged on the supporting component (101); The conveying mechanism (300) comprises a screw (301), wherein the screw (301) is connected to the driving mechanism (200), a shell (302) is provided on the screw (301), and a feed port (303) and a discharge port (304) are provided on the shell (302); The connecting mechanism (400) comprises a sealing component (401) and a connecting component (402), wherein the sealing component (401) and the connecting component (402) are arranged on the spiral body (301).

2. The long distance screw conveying device according to claim 1, characterized in that: The sealing component (401) comprises a rotating shaft (401a), a bearing (401b) is circumferentially arranged on the rotating shaft (401a), a bearing end cover (401d) is circumferentially arranged on the bearing (401b), a sealing member (401c) is arranged between the rotating shaft (401a) and the bearing end cover (401d), and pressure covers (401e) are arranged at both ends of the sealing member (401c). Wherein, a connecting hole (401k) is provided in the rotating shaft (401a).

3. The long distance screw conveying device according to claim 2, characterized in that: An air-sealing channel (401j) is provided between the bearing end cover (401d) and the sealing member (401c).

4. The long distance screw conveying device according to claim 3, characterized in that: The sealing component (401) further comprises an annular support (401f) and a connecting rod (401g), wherein the annular support (401f) is arranged around the outside of the bearing (401b), and the connecting rod (401g) passes through the bearing end cover (401d) and is arranged between the annular support (401f) and the bearing (401b).

5. The long distance screw conveying device according to claim 4, characterized in that: The connecting rods (401g) are provided in at least three pieces, and an air intake passage (401h) is provided inside one of the connecting rods (401g).

6. The long distance screw conveying device according to claim 5, characterized in that: An exhaust hole (401i) is provided inside the bearing end cover (401d), one end of the exhaust hole (401i) is connected to the air inlet hole (401h), and the other end is connected to the air sealing channel (401j).

7. The long distance screw conveyor device according to claim 1, characterized in that: The connecting component (402) comprises a flange (402a), and a connecting shaft (402b) is provided on one side of the flange (402a), and the connecting shaft (402b) is adapted to the connecting hole (401k).

8. A pulverized coal conveying system, characterized in that: The invention comprises the long-distance screw conveying device according to any one of claims 1 to 7, and The coal conveying control mechanism (500) comprises a coal mill coal outlet pipe (501), wherein a tee (502) is provided at the lower end of the coal mill coal outlet pipe (501), and the tee (502) is respectively connected to a first coal inlet branch pipe (504) and a second coal inlet branch pipe (505).

9. The pulverized coal conveying system according to claim 8, characterized in that: The coal conveying control mechanism (500) further comprises a three-way valve (503) and a gate valve (506); The three-way valve (503) is arranged on the three-way valve (502), and the gate valve (506) is arranged on the first coal inlet branch pipe (504).

10. The pulverized coal conveying system according to claim 9, characterized in that: It comprises at least three groups of the long-distance screw conveying devices, which are respectively arranged in at least two groups in the longitudinal direction and one group in the transverse direction; The longitudinally arranged long-distance screw conveying device is respectively connected to the coal conveying control mechanism (500), the first coal inlet branch pipe (504) and the second coal inlet branch pipe (505) are respectively connected to the shell (302), and the transversely arranged long-distance screw conveying device is respectively connected to the first coal inlet branch pipe (504) in sequence.

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