Coal pre-drying device coupled with molten salt heat storage device

Abstract

The application discloses a kind of coupling molten salt heat storage device raw coal pre-drying device, it is related to raw coal drying technical field, including heat source unit, feed unit, dehumidification unit and drying unit;Heat source unit, including outer tube, and inner tube being arranged in outer tube;Dehumidification unit is set on heat source unit;Drying unit, including rotation component being rotationally arranged on outer tube, the rotation component is rotated for driving component, the feeding assembly being arranged at one end of rotation component, the discharging assembly being arranged at the other end of rotation component, and the crushing assembly being arranged in rotation component, and close to one end of feeding assembly;Feed unit is set on feeding assembly.The coupling molten salt heat storage device raw coal pre-drying device can crush raw coal, increase the contact area of raw coal, and replace the heat exchange medium with molten salt to work in low pressure environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of raw coal drying, and in particular to a raw coal pre-drying device coupled with a molten salt heat storage device. BACKGROUND

[0002] With the rapid advancement of new energy technology, there has been a deviation in the specifications of the coal used in power plants from the original design specifications, especially the increase in the moisture content of the coal, which has become a significant problem. The increased moisture means that more energy needs to be consumed to evaporate this moisture before burning, and this additional energy would have been used to heat and dry the coal. As a result, the drying efficiency and production capacity of the coal mill are adversely affected because part of the necessary heat energy is redistributed to the water evaporation task. This effect has a chain reaction, limiting the performance of the generator set in maintaining or adjusting the load, i.e., weakening its ability to bear stable load and flexible load adjustment.

[0003] At present, most power plants remove moisture from raw coal by air-drying. However, due to the large amount of coal consumed by power plants every day and the limited space available for air-drying, power plants cannot provide sufficient air-drying space and time. The traditional fluidized bed steam drying technology is widely used, which efficiently utilizes the latent heat of moisture removal through a fluidized bed and can recycle steam. However, this technology has high requirements for the particle size of coal, which needs to be crushed in advance, increasing the processing cost. In addition, the use of steam heat exchangers and steam pipelines requires the device to work under high temperature and high pressure, increasing the safety risk of the system. SUMMARY

[0004] In view of the above-mentioned problems of the existing raw coal pre-drying device coupled with a molten salt heat storage device, the present application is proposed.

[0005] Therefore, the present application provides a raw coal pre-drying device coupled with a molten salt heat storage device, which aims to solve the technical problem of using steam heat exchangers and steam pipelines, which requires the device to work under high temperature and high pressure, increasing the safety risk of the system.

[0006] To solve the above technical problems, the present application provides the following technical solutions: including,

[0007] a heat source unit comprising an outer pipe and an inner pipe arranged in the outer pipe;

[0008] a dehumidification unit arranged on the heat source unit; and

[0009] The drying unit comprises a rotating assembly arranged on the outer pipe, a driving assembly for driving the rotating assembly to rotate, a feeding assembly arranged at one end of the rotating assembly, a discharging assembly arranged at the other end of the rotating assembly, and a crushing assembly arranged in the rotating assembly and close to one end of the feeding assembly; the feeding assembly is provided with a feeding unit.

[0010] As a preferred scheme of the coal pre-drying device coupled with the molten salt heat storage device, the rotating assembly comprises a pipe body provided with a feeding groove, spiral auger conveying leaves arranged on the pipe body, and an end cover arranged on the pipe body and located at the side of the feeding groove; the end cover and the spiral auger conveying leaves are both in sliding connection with the outer wall of the outer pipe.

[0011] As a preferred scheme of the coal pre-drying device coupled with the molten salt heat storage device, the feeding assembly comprises a support frame arranged on the outer pipe, a support sleeve arranged on the support frame and in sliding connection with the pipe body, a feeding port arranged on the upper part of the support sleeve and connected with the feeding unit, and an air inlet arranged on the lower part of the support sleeve and connected with the dehumidifying unit.

[0012] As a preferred scheme of the coal pre-drying device coupled with the molten salt heat storage device, the discharging assembly comprises a discharging sleeve arranged on the outer pipe and in sliding connection with the pipe body, an air suction port arranged on the upper part of the discharging sleeve and connected with the dehumidifying unit, and a discharging port arranged on the discharging sleeve.

[0013] As a preferred scheme of the coal pre-drying device coupled with the molten salt heat storage device, the crushing assembly comprises a dynamic crushing part arranged in the pipe body, a static crushing part arranged on the outer pipe, and a blocking part arranged on the static crushing part and in sliding connection with the dynamic crushing part.

[0014] As a preferred scheme of the coal pre-drying device coupled with the molten salt heat storage device, the outer pipe is provided with a through hole and a support block; the support block is located in the through hole and abuts against the inner pipe.

[0015] As a preferred scheme of the coal pre-drying device coupled with the molten salt heat storage device, the inner pipe comprises a reflux pipe arranged at one end in the outer pipe and abutting against the support block, a flow resistance plate arranged on the end of the reflux pipe located in the outer pipe, and a cover plate arranged on the other end of the reflux pipe; a heating channel is formed between the outer wall of the reflux pipe and the inner wall of the outer pipe.

[0016] As a preferred scheme of the coal pre-drying device coupled with the molten salt heat storage device, the heat source unit further comprises a liquid inlet pipe in communication with the inner pipe, an electric valve one arranged on the liquid inlet pipe, a liquid outlet pipe in communication with the outer pipe, and an electric valve two arranged on the liquid outlet pipe.

[0017] As a preferred scheme of the coal pre-drying device coupled with the molten salt heat storage device, the dehumidification unit comprises an air inlet pipe connected with the air inlet, a fan connected with the air inlet pipe, an air outlet pipe connected with the air suction port, and a dust cloth bag connected with the air outlet pipe.

[0018] As a preferred scheme of the coal pre-drying device coupled with the molten salt heat storage device, the air inlet pipe is provided with a moisture absorption air inlet valve, and the air outlet pipe is provided with a moisture absorption air outlet valve.

[0019] The present application has the beneficial effect that by replacing the heat exchange medium with molten salt, the technical problem of increasing the safety risk of the system due to the need for the device to work under high temperature and high pressure by using a steam heat exchanger and its steam pipeline can be solved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed 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.

[0021] Figure 1 It is a schematic diagram of the overall structure of the coal pre-drying device coupled with the molten salt heat storage device.

[0022] Figure 2 It is a schematic diagram of the local structure of the coal pre-drying device coupled with the molten salt heat storage device.

[0023] Figure 3 It is an exploded view of the structure of the coal pre-drying device coupled with the molten salt heat storage device.

[0024] Figure 4 It is a schematic diagram of the structure at the rotating assembly of the coal pre-drying device coupled with the molten salt heat storage device.

[0025] Figure 5 It is a schematic diagram of the structure of the inner pipe of the coal pre-drying device coupled with the molten salt heat storage device. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0027] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be appreciated that the present application can be practiced in a variety of ways beyond the specifics set forth herein, and that the present application can be practiced without resorting to the details set forth herein, within the scope of the present application, variations of which can be accepted herewith by one skilled in the art. Therefore, the present application should not be construed as limited to the embodiments set forth in the following description.

[0028] Second, the "one embodiment" or "an embodiment" as referred to herein means a specific feature, structure, or characteristic under discussion. Thus, "in one embodiment" as used throughout this specification does not necessarily refer to the same embodiment, although it can. In addition, this specification may

[0029] Third, the present application is described in detail below in connection with the appended drawings, in which the same or like reference numerals are used to indicate the same or like components throughout the views. The drawings are included to provide a further understanding of the present application, and are incorporated in and constitute a part of this specification. It will be readily apparent to those skilled in the art that the present application can be practiced without resorting to the details set forth in the following description. The present application is shown by way of example in the drawings and will be described in detail in the text below.

[0030] Embodiment 1, refer to Figures 1-5 For the first embodiment of the present application, a coal pre-drying device coupled with a molten salt heat storage device is provided. The device includes a heat source unit 100, a feeding unit 200, a dehumidifying unit 300, and a drying unit 400.

[0031] The heat source unit 100 includes an outer tube 103 and an inner tube 104 arranged in the outer tube 103. The dehumidifying unit 300 is arranged on the heat source unit 100. The drying unit 400 includes a rotating assembly 401 rotatably arranged on the outer tube 103, a driving assembly 402 for driving the rotating assembly 401 to rotate, an upper feeding assembly 403 arranged at one end of the rotating assembly 401, a lower feeding assembly 404 arranged at the other end of the rotating assembly 401, and a crushing assembly 405 arranged in the rotating assembly 401 and close to the one end of the upper feeding assembly 403. The feeding unit 200 is arranged on the upper feeding assembly 403.

[0032] Further, the outer tube 103 is provided with a through hole 103a and a support block 103b; the support block 103b is located in the through hole 103a and abuts against the inner tube 104. The inner tube 104 includes a return tube 104a provided at one end in the outer tube 103 and abutting against the support block 103b, a flow resistance plate 104b provided on the end of the return tube 104a located in the outer tube 103, and a cover plate 104c provided on the other end of the return tube 104a; a heating channel is formed between the outer wall of the return tube 104a and the inner wall of the outer tube 103; the flow resistance plate 104b is used to limit the flow of molten salt, so that the molten salt can fill the inner wall of the outer tube 103 and the outer wall of the inner tube 104 under a smaller pressure.

[0033] The heat source unit 100 further includes a liquid inlet pipe 101 in communication with the inner tube 104, an electric valve one 101a provided on the liquid inlet pipe 101, a liquid outlet pipe 102 in communication with the outer tube 103, and an electric valve two 102a provided on the liquid outlet pipe 102.

[0034] In use, the inner tube 104 is provided with an electric heating pipe, before the molten salt is introduced, the inner tube 104 needs to be heated, so that the temperature of the inner tube 104 is higher than the melting point of the molten salt, when the temperature of the inner tube 104 is ten degrees Celsius higher than the melting point of the molten salt, the electric heating device is closed, and the electric valve one 101a and the electric valve two 102a are opened, so that the heated molten salt enters the inner tube 104 through the liquid inlet pipe 101, flows between the inner tube 104 and the outer tube 103, and then flows into the outer tube 103, and then flows back to the molten salt heating device through the liquid outlet pipe 102, realizing the circulation of the heat source, and the molten salt flows to heat the outer tube 103; at this time, the raw coal is transported into the feeding assembly 403 through the feeding unit 200, and then the driving assembly 402 drives the rotating assembly 401 to rotate, the rotating assembly 401 drives the crushing assembly 405 to work, so that the crushing assembly 405 crushes the raw coal, and the crushed raw coal is transported by the rotating assembly 401, so that the raw coal can contact the outer tube 103, and because the liquid inlet pipe 101 is located away from the crushing assembly 405, the temperature on the side close to the crushing assembly 405 is lower than the temperature on the side close to the liquid inlet pipe 101, so that the raw coal can be gradually heated, and the water vapor generated by heating is collected by the dehumidifying unit 300, and the raw coal after heating is discharged through the discharging assembly 404.

[0035] The heat exchange medium flowing in the liquid inlet pipe 101 is selected as molten salt, there are many types of molten salt, the melting point is between 100-200℃, and the gasification point is above 500℃, so it does not need to work under high temperature and high pressure, improving the safety performance of the equipment. At the same time, the device can continuously operate to supply high-quality raw coal with low water content to the coal-fired power plant, ensuring the efficient and stable operation of the power plant unit.

[0036] Embodiment 2, refer to Figures 1-5For the second embodiment of the application, which is different from the first embodiment, the feeding assembly 403 comprises a support frame 403a arranged on the outer tube 103, a support sleeve 403b arranged on the support frame 403a and in sliding connection with the tube body 401a, a feeding port 403c arranged on the upper part of the support sleeve 403b and connected with the feeding unit 200, and an air inlet 403d arranged on the lower part of the support sleeve 403b and connected with the dehumidifying unit 300.

[0037] Further, the discharging assembly 404 comprises a discharging sleeve 404a arranged on the outer tube 103 and in sliding connection with the tube body 401a, an air outlet 404b arranged on the upper part of the discharging sleeve 404a and connected with the dehumidifying unit 300, and a discharging port 404c arranged on the discharging sleeve 404a; through the discharging assembly 404, the dried raw coal can be collected, so that the raw coal falls from the discharging port 404c and is conveniently collected.

[0038] In use, the feeding unit 200 comprises a feeding pipe and a three-way valve; one end of the three-way valve is in communication with the feeding port 403c, and when the tube body 401a rotates, the feeding port 403c is aligned with the feeding groove 401a-1 and then separated, so that the raw coal enters the tube body 401a through the feeding groove 401a-1 when the feeding port 403c is aligned with the feeding groove 401a-1, and the raw coal stops when the feeding groove 401a-1 is separated from the feeding port 403c, thereby realizing intermittent feeding, preventing the crushing assembly 405 from being blocked due to continuous feeding, and enabling normal operation without affecting the rotation of the tube body 401a; the air blown out by the air inlet pipe 302 enters the tube body 401a through the air inlet 403d.

[0039] The raw coal conveyed by the rotating assembly 401 is in contact with the outer tube 103 and is heated and dried by the outer tube 103, and when conveyed to the discharging sleeve 404a, the raw coal is collected by the discharging sleeve 404a and then falls from the discharging port 404c, thereby conveniently collecting the raw coal and conveying the water vapor generated after heating into the air outlet pipe 303 through the air outlet 404b.

[0040] The remaining structure is the same as that of the first embodiment.

[0041] Embodiment 3, refer to Figures 1-5 For the third embodiment of the application, which is different from the second embodiment, the rotating assembly 401 comprises a tube body 401a having a feeding groove 401a-1, a spiral auger conveying blade 401b arranged on the tube body 401a, and an end cover 401c arranged on the tube body 401a and located on the side of the feeding groove 401a-1; the end cover 401c and the spiral auger conveying blade 401b are both in sliding connection with the outer wall of the outer tube 103.

[0042] Further, the crushing assembly 405 includes a moving crushing part 405a arranged in the pipe body 401a, a static crushing part 405b arranged on the outer pipe 103, and a blocking part 405c arranged on the static crushing part 405b and in sliding connection with the moving crushing part 405a; through rotation of the crushing assembly 405, the raw coal can be crushed when falling, so that the contact area of the raw coal with the outer pipe 103 is increased.

[0043] In use, the driving assembly 402 includes a driving motor and a transmission part in any form of belt transmission or gear transmission, the pipe body 401a is driven to rotate through the driving assembly 402, the spiral auger conveying blade 401b is driven to rotate by the pipe body 401a, the end cover 401c enables the pipe body 401a to be in a relatively sealed state, so as to avoid raw coal from falling and prevent hot gas from escaping, the spiral auger conveying blade 401b pushes the raw coal to slide on the outer pipe 103 when rotating, and the outer pipe 103 is heated, so as to heat the raw coal, the raw coal after being heated can evaporate the moisture inside, and the temperature is higher closer to the discharging assembly 404, so that the raw coal is gradually heated and the moisture in the raw coal can be quickly discharged.

[0044] When the pipe body 401a rotates, the moving crushing part 405a is also driven to rotate, the raw coal falling into the pipe body 401a first falls between the moving crushing part 405a and the static crushing part 405b, when the size of the raw coal is smaller than the gap between the small head of the end part of the moving crushing part 405a and the static crushing part 405b, the raw coal will flow down from the gap and directly fall into the spiral auger conveying blade 401b and be conveyed by the spiral auger conveying blade 401b, if the size of the raw coal is larger than the small head gap, the raw coal will be crushed by the moving crushing part 405a cooperating with the static crushing part 405b, so as to be conveyed in small pieces, the raw coal crushed into small pieces can not only increase the contact area with the outer pipe 103, but also can be quickly dried due to the reduced volume, and the large pieces of raw coal can avoid blocking the discharging assembly 404.

[0045] The remaining structure is the same as that of example 2.

[0046] Example 4, refer to Figures 1-5 This is the fourth embodiment of the present application, which is different from the third embodiment: the dehumidifying unit 300 includes an air inlet pipe 302 connected with the air inlet 403d, a fan 301 connected with the air inlet pipe 302, an air outlet pipe 303 connected with the air outlet 404b, and a dust cloth bag 304 connected with the air outlet pipe 303.

[0047] Further, the air inlet pipe 302 is provided with a moisture suction air inlet valve 302a; the air outlet pipe 303 is provided with a moisture suction air outlet valve 303a; the air inlet pipe 302 is controlled by the moisture suction air inlet valve 302a; the air outlet pipe 303 is controlled by the moisture suction air outlet valve 303a.

[0048] In use, when the water vaporized in the pipe body 401a is removed, the fan 301 is started, and the moisture suction air inlet valve 302a and the moisture suction air outlet valve 303a are opened, so that the air inlet pipe 302 and the air outlet pipe 303 are in an open state, air enters the pipe body 401a through the air inlet 403d, and the vaporized water is output through the air outlet 404b, so that the air enters the air outlet pipe 303 and then enters the dust cloth bag 304 to discharge the water, so that the water vaporized by the heating of the raw coal in the pipe body 401a can be quickly discharged.

[0049] The remaining structure is the same as that of Example 3.

[0050] Importantly, it should be noted that the configurations and arrangements of the present application shown in the various exemplary embodiments are merely illustrative. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art will readily comprehend, upon the disclosure herein, that many modifications can be made (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the coupled molten salt heat storage device raw coal pre-drying device described in this application. For example, elements shown as integrally formed can be constructed of multiple parts or elements, the position of elements can be inverted or otherwise changed, and the nature or number of discrete elements or positions can be modified or changed. Accordingly, all such modifications are intended to be included within the scope of the present application. The order or sequence of any process or method steps can be changed or re-sequenced without departing from the generality of the application. In the claims, any "means plus function" clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes, and omissions can be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the application. Accordingly, the present application is not limited to particular embodiments, but extends to various modifications that nevertheless fall within the scope of the appended claims.

[0051] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual implementation can not be described (i.e., those unrelated to the best mode of carrying out the present application currently under consideration or those unrelated to enabling the present application).

[0052] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A raw coal pre-drying device coupled with a molten salt heat storage device, characterized in that: include, A heat source unit (100) comprises an outer tube (103) and an inner tube (104) arranged inside the outer tube (103); the heat source unit (100) further comprises a liquid inlet tube (101) communicating with the inner tube (104), a first electric valve (101a) arranged on the liquid inlet tube (101), a liquid outlet tube (102) communicating with the outer tube (103), and a second electric valve (102a) arranged on the liquid outlet tube (102); The heated molten salt enters the inner tube (104) through the liquid inlet pipe (101), circulates between the inner tube (104) and the outer tube (103), then flows into the outer tube (103), and flows back to the molten salt heating device through the liquid outlet pipe (102); a dehumidification unit (300), provided on the heat source unit (100); and The drying unit (400) comprises a rotating assembly (401) rotatably arranged on the outer tube (103), a driving assembly (402) for driving the rotating assembly (401) to rotate, the rotating assembly (401) comprising a tube body (401a) having a feeding trough (401a-1), a loading assembly (403) arranged at one end of the rotating assembly (401), a unloading assembly (404) arranged at the other end of the rotating assembly (401), and a 401) and close to one end of the feeding assembly (403); the crushing assembly (405) comprises a dynamic crushing part (405a) arranged in the tube body (401a), a static crushing part (405b) arranged on the outer tube (103), and a blocking part (405c) arranged on the static crushing part (405b) and slidably connected to the dynamic crushing part (405a); and a feeding unit (200) is provided on the feeding assembly (403).

2. The raw coal pre-drying device coupled with a molten salt heat storage device according to claim 1, characterized in that: The rotating assembly (401) further comprises a spiral auger conveying blade (401b) arranged on the tube body (401a), and an end cover (401c) arranged on the tube body (401a) and located on the side of the feed trough (401a-1); the end cover (401c) and the spiral auger conveying blade (401b) are both slidably connected to the outer wall of the outer tube (103).

3. The raw coal pre-drying device coupled with a molten salt heat storage device according to claim 2, characterized in that: The feeding assembly (403) comprises a support frame (403a) arranged on the outer tube (103), a support sleeve (403b) arranged on the support frame (403a) and slidably connected to the tube body (401a), a feed port (403c) arranged on the upper part of the support sleeve (403b) and connected to the feeding unit (200), and an air inlet (403d) arranged on the lower part of the support sleeve (403b) and connected to the dehumidification unit (300).

4. The raw coal pre-drying device coupled with a molten salt heat storage device according to claim 3, characterized in that: The material discharge assembly (404) comprises a material discharge sleeve (404a) arranged on the outer tube (103) and slidably connected to the tube body (401a), an air suction port (404b) arranged on the upper part of the material discharge sleeve (404a) and connected to the dehumidification unit (300), and a material discharge port (404c) arranged on the material discharge sleeve (404a).

5. The raw coal pre-drying device coupled with a molten salt heat storage device according to claim 4, characterized in that: The outer tube (103) is provided with a through hole (103a) and a support block (103b); the support block (103b) is located in the through hole (103a) and abuts against the inner tube (104).

6. The raw coal pre-drying device coupled with a molten salt heat storage device according to claim 5, characterized in that: The inner tube (104) comprises a return tube (104a) having one end disposed in the outer tube (103) and abutting against the support block (103b), a baffle (104b) disposed on the end of the return tube (104a) located in the outer tube (103), and a cover plate (104c) disposed on the other end of the return tube (104a); a heating channel is formed between the outer wall of the return tube (104a) and the inner wall of the outer tube (103).

7. The raw coal pre-drying device coupled with a molten salt heat storage device according to claim 6, characterized in that: The dehumidification unit (300) comprises an air inlet pipe (302) connected to the air inlet (403d), a fan (301) connected to the air inlet pipe (302), an air outlet pipe (303) connected to the air suction port (404b), and a dust removal bag (304) connected to the air outlet pipe (303).

8. The raw coal pre-drying device coupled with a molten salt heat storage device according to claim 7, characterized in that: The air inlet pipe (302) is provided with a moisture-absorbing air inlet valve (302a); the air outlet pipe (303) is provided with a moisture-absorbing air outlet valve (303a).

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