Raw coal pre-drying device coupled with fused salt heat storage device

Abstract

The invention discloses a raw coal pre-drying device coupled with a fused salt heat storage device and relates to the technical field of raw coal drying. The raw coal pre-drying device comprises a heat source unit, a feeding unit, a dehumidification unit and a drying unit. The heat source unit comprises an outer pipe and an inner pipe arranged in the outer pipe; the dehumidification unit is arranged on the heat source unit; the drying unit comprises a rotating assembly rotationally arranged on the outer pipe, a driving assembly used 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 unit is arranged on the loading assembly. According to the raw coal pre-drying device coupled with the fused salt heat storage device, raw coal can be crushed, the contact area of the raw coal is increased, a heat exchange medium is replaced with fused salt, and the raw coal pre-drying device can work in a low-pressure environment.

Description

Technical Field

[0001] The invention 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 Art

[0002] With the rapid advancement of new energy technologies, the power industry has seen coal used in power plants deviate significantly from the original design specifications, especially the increase in moisture content in the coal has become a significant problem. The increased moisture means that more energy is needed to evaporate the moisture before combustion, and this extra energy was originally used to heat and dry the coal powder. As a result, the drying efficiency and production capacity inside the pulverizer are adversely affected because part of the necessary heat energy is reallocated to the task of moisture evaporation. This chain reaction of effects limits the performance of the generator set in maintaining or adjusting the load, that is, it weakens its ability to bear stable loads and flexibly adjust loads.

[0003] At present, most power plants remove moisture from raw coal by drying it in the sun. However, power plants consume a large amount of coal every day and have limited open space, which cannot provide sufficient space and time for drying. Fluidized bed steam drying technology, which is traditionally widely used, efficiently utilizes the latent heat of removing moisture through the fluidized bed and can recycle steam. However, this technology has high requirements on the particle size of coal and requires pre-crushing of the coal, which increases the processing cost. In addition, the steam heat exchanger and its steam pipeline are used, and the device needs to work under high temperature and high pressure, which increases the safety risk of the system. Summary of the invention

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

[0005] Therefore, the present invention provides a raw coal pre-drying device coupled with a molten salt heat storage device, the purpose of which is to solve the technical problem that the device needs to work under high temperature and high pressure using a steam heat exchanger and its steam pipeline, which increases the safety risk of the system.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising:

[0007] A heat source unit comprises an outer tube and an inner tube disposed inside the outer tube;

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

[0009] The drying unit includes a rotating assembly rotatably arranged on the outer tube, a driving assembly for driving the rotating assembly to rotate, a loading assembly arranged at one end of the rotating assembly, a unloading 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 loading assembly; a feeding unit is arranged on the loading assembly.

[0010] As a preferred solution of the raw coal pre-drying device coupled with the molten salt heat storage device of the present invention, the rotating assembly includes a pipe body with a feed trough, a spiral auger conveying blade arranged on the pipe body, and an end cover arranged on the pipe body and located on the side of the feed trough; the end cover and the spiral auger conveying blade are both slidably connected to the outer wall of the outer tube.

[0011] As a preferred solution of the raw coal pre-drying device of the coupled molten salt heat storage device described in the present invention, the feeding assembly includes a support frame arranged on the outer tube, a support sleeve arranged on the support frame and slidably connected to the tube body, a feed port arranged on the upper part of the support sleeve and connected to the feeding unit, and an air inlet arranged on the lower part of the support sleeve and connected to the dehumidification unit.

[0012] As a preferred solution of the raw coal pre-drying device of the coupled molten salt heat storage device described in the present invention, the material discharge assembly includes a material discharge sleeve arranged on the outer tube and slidably connected to the tube body, an air suction port arranged on the upper part of the material discharge sleeve and connected to the dehumidification unit, and a material discharge port arranged on the material discharge sleeve.

[0013] As a preferred solution of the raw coal pre-drying device coupled with the molten salt heat storage device of the present invention, the crushing assembly includes a dynamic crushing part arranged in the tube body, a static crushing part arranged on the outer tube, and a blocking part arranged on the static crushing part and slidably connected to the dynamic crushing part.

[0014] As a preferred solution of the raw coal pre-drying device coupled with the molten salt heat storage device of the present invention, wherein: a through hole and a support block are provided on the outer tube; the support block is located in the through hole and abuts against the inner tube.

[0015] As a preferred solution of the raw coal pre-drying device of the coupled molten salt heat storage device of the present invention, the inner tube includes a return pipe having one end arranged in the outer tube and abutting against the support block, a baffle arranged on the end of the return pipe located in the outer tube, and a cover plate arranged on the other end of the return pipe; a heating channel is formed between the outer wall of the return pipe and the inner wall of the outer tube.

[0016] As a preferred solution of the raw coal pre-drying device of the coupled molten salt heat storage device described in the present invention, the heat source unit also includes a liquid inlet pipe connected to the inner pipe, an electric valve 1 arranged on the liquid inlet pipe, a liquid outlet pipe connected to the outer pipe, and an electric valve 2 arranged on the liquid outlet pipe.

[0017] As a preferred solution of the raw coal pre-drying device of the coupled molten salt heat storage device of the present invention, the dehumidification unit includes an air inlet pipe connected to the air inlet, a fan connected to the air inlet pipe, an air outlet pipe connected to the air suction port, and a dust removal bag connected to the air outlet pipe.

[0018] As a preferred solution of the raw coal pre-drying device coupled with the molten salt heat storage device of the present invention, wherein: a moisture absorbing air inlet valve is arranged on the air inlet pipe; and a moisture absorbing air outlet valve is arranged on the air outlet pipe.

[0019] The beneficial effects of the present invention are as follows: by replacing the heat exchange medium with molten salt, it is possible to solve the technical problem that the steam heat exchanger and its steam pipeline need to work under high temperature and high pressure, which leads to increased system safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0022] Figure 2 It is a partial structural schematic diagram of the raw coal pre-drying device coupled with the molten salt heat storage device of the present invention.

[0023] Figure 3 This is a structural explosion diagram of the raw coal pre-drying device coupled with the molten salt heat storage device of the present invention.

[0024] Figure 4 It is a structural schematic diagram of the rotating component in the raw coal pre-drying device coupled with the molten salt heat storage device of the present invention.

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

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] 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.

[0028] 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 is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0029] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0030] Example 1, reference Figure 1-Figure 5 , which is the first embodiment of the present invention, provides a raw coal pre-drying device coupled with a molten salt heat storage device, the device comprising a heat source unit 100, a feeding unit 200, a dehumidification unit 300, and a drying unit 400;

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

[0032] Furthermore, 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 pipe 104a whose one end is arranged in the outer tube 103 and abuts against the support block 103b, a baffle 104b arranged on the end of the return pipe 104a located in the outer tube 103, and a cover plate 104c arranged on the other end of the return pipe 104a; a heating channel is formed between the outer wall of the return pipe 104a and the inner wall of the outer tube 103; the baffle 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 at a relatively small pressure.

[0033] The heat source unit 100 further includes a liquid inlet pipe 101 connected to the inner pipe 104 , an electric valve 1 101a disposed on the liquid inlet pipe 101 , a liquid outlet pipe 102 connected to the outer pipe 103 , and an electric valve 2 102a disposed on the liquid outlet pipe 102 .

[0034] During use, an electric heating tube is arranged in the inner tube 104. Before the molten salt is introduced, the inner tube 104 needs to be heated so that the temperature of the inner tube 104 is greater than the melting point of the molten salt. When the temperature of the inner tube 104 is higher than the melting point of the molten salt by ten degrees Celsius, the electric heating device is turned off, and the electric valve 101a and the electric valve 2 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 flows back to the molten salt heating device through the liquid outlet pipe 102, so as to realize the circulation of the heat source. When the molten salt flows, it will heat the outer tube 103; at this time, the feeding unit 20 The raw coal is transported to the feeding assembly 403, 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. The crushed raw coal is transported by the rotating assembly 401, so that the raw coal can contact the outer tube 103. Since the liquid inlet pipe 101 is located on the side away from the crushing assembly 405, the temperature of the side close to the crushing assembly 405 is lower than the temperature of the side close to the liquid inlet pipe 101, so that the raw coal can be gradually heated, and the water vapor generated by the heating is collected by the dehumidification unit 300. The raw coal after heating is discharged through the unloading 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, with a melting point between 100-200°C and a gasification point above 500°C. Therefore, it does not need to work under high temperature and high pressure, which improves the safety performance of the equipment. At the same time, the device can operate continuously to supply high-quality raw coal with low moisture content to coal-fired power plants, ensuring the efficient and stable operation of power plant units.

[0036] Example 2, reference Figure 1-Figure 5, which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: a loading assembly 403 includes 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 at the upper part of the support sleeve 403b and connected to the feed unit 200, and an air inlet 403d arranged at the lower part of the support sleeve 403b and connected to the dehumidification unit 300.

[0037] Furthermore, the unloading assembly 404 includes a unloading 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 unloading sleeve 404a and connected to the dehumidification unit 300, and a unloading port 404c arranged on the unloading sleeve 404a; the dried raw coal can be collected through the unloading assembly 404, so that the raw coal falls from the unloading port 404c for easy collection.

[0038] During use, the feeding unit 200 includes a feeding pipe and a three-way valve; one end of the three-way valve is connected to the feeding port 403c, and when the tube body 401a rotates, the feeding port 403c will be aligned with the feeding trough 401a-1, and then separated. When the feeding port 403c is aligned with the feeding trough 401a-1, the raw coal will enter the tube body 401a through the feeding trough 401a-1, and when the feeding trough 401a-1 is separated from the feeding port 403c, the raw coal will stop, thereby realizing intermittent feeding, preventing blockage at the crushing assembly 405 due to continuous feeding, and realizing 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 transported by the rotating component 401 contacts the outer tube 103 and is heated and dried by the outer tube 103. After being transported to the discharge sleeve 404a, it is collected by the discharge sleeve 404a and then falls from the discharge port 404c, so that the raw coal can be collected uniformly. The water vapor generated after heating is transported to the outlet pipe 303 through the suction port 404b.

[0040] The remaining structures are the same as those of Example 1.

[0041] Example 3, reference Figure 1-Figure 5 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the rotating assembly 401 includes a tube body 401a with a feed trough 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 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.

[0042] Furthermore, the crushing assembly 405 includes 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; the rotation of the crushing assembly 405 can crush the raw coal when it falls, thereby increasing the contact area between the raw coal and the outer tube 103.

[0043] During use, the driving component 402 includes a driving motor and a transmission part, and the transmission part is any form of belt drive or gear drive. The driving component 402 can drive the tube body 401a to rotate, and the tube body 401a drives the spiral auger conveying blade 401b to rotate. The end cover 401c makes the tube body 401a in a relatively sealed state, which can prevent the raw coal from spilling and prevent hot air from escaping. The spiral auger conveying blade 401b will push the raw coal to slide on the outer tube 103 when rotating. After the outer tube 103 is heated, the raw coal can be heated. The heated raw coal can evaporate the moisture inside it, and the closer to the unloading component 404, the higher the temperature, so that the raw coal is gradually heated and the moisture in the raw coal can be quickly discharged.

[0044] When the tube body 401a rotates, the dynamic crushing part 405a will be driven to rotate at the same time, and the raw coal falling into the tube body 401a will first fall between the dynamic crushing part 405a and the static crushing part 405b. When the size of the raw coal is smaller than the small head gap at the ends of the dynamic 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 transported by the spiral auger conveying blade 401b. If the size of the raw coal is larger than the small head gap, it will be crushed by the dynamic crushing part 405a in cooperation with the static crushing part 405b, and the raw coal will be broken into small pieces for transportation. The raw coal broken into small pieces can not only increase the contact area with the outer tube 103, but also can be dried quickly due to its reduced volume, and can prevent large pieces of raw coal from clogging the unloading component 404.

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

[0046] Example 4, reference Figure 1-Figure 5 , which is the fourth embodiment of the present invention. This embodiment is different from the third embodiment in that: the dehumidification unit 300 includes 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 bag 304 connected to the air outlet pipe 303.

[0047] Furthermore, a moisture absorption air inlet valve 302a is provided on the air inlet pipe 302; a moisture absorption air outlet valve 303a is provided on the air outlet pipe 303; the moisture absorption air inlet valve 302a can control the on-off of the air inlet pipe 302, and the moisture absorption air outlet valve 303a can control the on-off of the air outlet pipe 303.

[0048] During use, when removing the evaporated moisture in the tube body 401a, start the fan 301 and open the moisture absorption air inlet valve 302a and the moisture absorption air outlet valve 303a, so that the air inlet pipe 302 and the air outlet pipe 303 are in an open state, and the air enters the tube body 401a through the air inlet 403d, and then the evaporated moisture is output through the air suction port 404b, so that it enters the air outlet pipe 303, and then enters the dust removal bag 304 to discharge the moisture, so that the moisture after the raw coal in the tube body 401a is heated and evaporated can be quickly discharged.

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

[0050] It is important to note that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be easily understood by those who refer to this disclosure that many modifications are possible (for example, the size, scale, structure, shape and proportion of various elements, as well as parameter values ​​(for example, temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the raw coal predrying device of the coupled molten salt heat storage device 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 the execution function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to a variety of modifications that still fall within the scope of the appended claims.

[0051] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (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) may not be described.

[0052] 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 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); a dehumidification unit (300) disposed 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, 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 crushing assembly (405) arranged in the rotating assembly (401) and close to one end of the loading assembly (403); a feeding unit (200) is arranged on the loading assembly (403).

2. The raw coal pre-drying device of the coupled molten salt heat storage device according to claim 1 is characterized in that: The rotating assembly (401) comprises a tube body (401a) having a feed trough (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 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 the molten salt heat storage device according to claim 2 is 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 for coupling molten salt heat storage device according to claim 3 is 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 the molten salt heat storage device according to claim 4 is characterized in that: 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).

6. The raw coal pre-drying device coupled with the molten salt heat storage device according to claim 5 is 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).

7. The raw coal pre-drying device coupled with a molten salt heat storage device according to claim 6, characterized in that: The inner tube (104) comprises a return tube (104a) having one end arranged inside the outer tube (103) and abutting against the support block (103b), a baffle (104b) arranged on the end of the return tube (104a) located inside the outer tube (103), and a cover plate (104c) arranged 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).

8. The raw coal pre-drying device coupled with the molten salt heat storage device according to claim 7, characterized in that: The heat source unit (100) further comprises a liquid inlet pipe (101) connected to the inner pipe (104), an electric valve 1 (101a) arranged on the liquid inlet pipe (101), a liquid outlet pipe (102) connected to the outer pipe (103), and an electric valve 2 (102a) arranged on the liquid outlet pipe (102).

9. The raw coal pre-drying device of the coupled molten salt heat storage device according to any one of claims 4 to 8, 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).

10. The raw coal pre-drying device coupled with a molten salt heat storage device according to claim 9, characterized in that: The air inlet pipe (302) is provided with a moisture absorbing air inlet valve (302a); and the air outlet pipe (303) is provided with a moisture absorbing air outlet valve (303a).

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