A drying device for powdered coal production

Abstract

The application discloses a drying device for powder coal production, and belongs to the technical field of powder coal production.The drying device comprises a heat exchanger, a hot blast furnace and a cyclone dust collector.The heat exchanger comprises a front end plate and a rear end plate, and heat-conducting sheets are arranged between the front end plate and the rear end plate.The hot blast furnace comprises a furnace body, and a pipeline is arranged in the furnace body.The cyclone dust collector comprises a shell, a flow channel is arranged in the shell, and an inner shell is detachably arranged in the shell, and a spiral plate is arranged on the inner wall of the inner shell.The application can utilize the waste heat generated by the hot blast furnace to heat and dry the cyclone dust collector, thereby saving energy, reducing power consumption and production cost, and being more environmentally-friendly; meanwhile, the spiral plate arranged in the cyclone dust collector can catch the powder coal particles, thereby prolonging the heating time of the powder coal particles in the cyclone dust collector, and further improving the drying effect of the device.

Description

Technical Field

[0001] This invention belongs to the field of pulverized coal production technology, specifically a drying device for pulverized coal production. Background Technology

[0002] Pulverized coal refers to coal with a particle size of less than 6mm, and it has been widely used in many industries such as metallurgy, mining, construction, and energy.

[0003] In existing technologies, the production of pulverized coal typically requires the use of coal mills, hot air furnaces, and baghouse dust collectors. After obtaining the pulverized coal, it needs to be dried, a step usually completed before the final pulverized coal is stored in the silo. Due to the inherent properties of pulverized coal, its production has strict requirements regarding moisture content and particle size. Therefore, drying equipment needs to be maintained for multiple processes before the pulverized coal is stored in the silo to ensure better drying efficiency and finished product quality.

[0004] However, this would require more energy to generate heat, which would not only significantly increase production costs but also be environmentally unfriendly. Summary of the Invention

[0005] The present invention provides a drying apparatus for pulverized coal production, which solves the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A drying device for pulverized coal production includes a heat exchanger connected to a hot air furnace and a cyclone dust collector. The heat exchanger includes a front end plate and a rear end plate, with heat-conducting fins disposed between the front end plate and the rear end plate. A hot fluid inlet, a cold fluid inlet, a cold fluid outlet, and a hot fluid outlet are disposed on the end face of the front end plate. The hot air furnace includes a furnace body, within which a pipe is disposed. The pipe is connected to the cold fluid outlet via a first liquid inlet and to the hot fluid inlet via a first liquid outlet. The cyclone dust collector includes an outer shell, within which a flow channel is disposed. The flow channel is connected to the hot fluid outlet via a second liquid inlet and to the cold fluid inlet via a second liquid outlet. An inner shell is detachably installed within the outer shell, and a spiral plate is disposed on the lower part of the inner wall of the inner shell.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0009] This invention utilizes the combined action of a hot air furnace, a heat exchanger, and a cyclone dust collector to heat and dry the cyclone dust collector using the waste heat generated by the hot air furnace, saving energy, reducing power consumption and production costs, and making it more environmentally friendly. At the same time, the spiral plates installed inside the cyclone dust collector catch the pulverized coal particles, extending their heating time within the cyclone dust collector and further improving the drying effect of the device.

[0010] As a further improvement to the above solution, an air inlet communicating with the interior of the housing is provided on the upper side of the housing, a material discharge port is provided at the bottom of the housing, and an air outlet extending into the interior of the housing is provided at the center of the top of the housing.

[0011] The improved technical effects are as follows: by setting up the air inlet, material outlet, and air outlet, the cyclone dust collector of this device can be more easily installed and connected to the pulverized coal production line.

[0012] As a further improvement to the above scheme, it also includes a raw material silo, which is connected to a coal mill, the coal mill is connected to a screening device, the screening device is connected to a pulverized coal silo, the pulverized coal silo is connected to a buffer tank, the buffer tank is connected to the feed end of a hot air furnace, the hot air furnace is connected to a cyclone dust collector, and the cyclone dust collector is connected to a pulverized coal silo.

[0013] The technical effects of the above improvements are as follows: by setting up equipment such as raw material silos, coal mills, screening devices, and coal powder silos, the coal pulverization production line can work in conjunction with the drying device to achieve full operation, making the production and drying process more rational.

[0014] As a further improvement to the above solution, the air outlet is connected to a circulating fan, and the air outlet of the circulating fan is connected to the screening device and the air inlet of the hot air furnace.

[0015] The technical effects of the above improvements are as follows: by setting up the circulating fan and its connecting structure, the cyclone dust collector, screening device and hot air furnace of this device can achieve air circulation, enabling the screening device and hot air furnace to reuse the exhaust gas and repeatedly filter out pulverized coal from the exhaust gas, thereby improving production efficiency.

[0016] As a further improvement to the above scheme, the fine material outlet of the screening device is connected to the coal powder silo, and the coarse material outlet of the screening device is connected to the feed inlet of the coal mill.

[0017] The above-mentioned technical improvement has the following effect: by setting the connection structure of the screening device, the pulverized coal production line used in this drying device can further improve the production efficiency of pulverized coal.

[0018] As a further improvement to the above solution, the spiral plate is provided with spaced discharge holes.

[0019] The above-mentioned improved technical effects are as follows: by setting the material discharge hole, this device can further prevent pulverized coal from accumulating on the spiral plate and improve the material discharge effect of the cyclone dust collector.

[0020] As a further improvement to the above solution, the upper end of the inner shell is positioned and connected to the upper end of the outer shell through spaced positioning posts.

[0021] The technical effect of the above improvement is that the positioning column ensures that the inner shell inside the outer shell of the device can be installed stably and is prevented from being rotated by the wind. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the connection of the pulverized coal production line of the present invention.

[0023] Figure 2 This is a schematic diagram of the cyclone dust collector of the present invention.

[0024] Figure 3 This is a partial cross-sectional view of the hot blast stove of the present invention.

[0025] Figure 4 This is a three-dimensional structural schematic diagram of the heat exchanger of the present invention.

[0026] Figure 5 This is a frontal sectional view of the cyclone dust collector of the present invention.

[0027] Figure 6 This is a top sectional view of the cyclone dust collector of the present invention.

[0028] In the diagram: 1. Raw material silo; 2. Coal mill; 3. Screening device; 4. Pulverized coal silo; 5. Buffer tank; 6. Hot blast stove; 61. Furnace body; 62. Pipeline; 63. First liquid inlet; 64. First liquid outlet; 7. Heat exchanger; 71. Front end plate; 72. Rear end plate; 73. Heat-conducting plate; 74. Hot fluid inlet; 75. Cold fluid inlet; 76. Cold fluid outlet; 77. Hot fluid outlet; 8. Cyclone dust collector; 81. Outer shell; 82. Air inlet; 83. Air outlet; 84. Second liquid inlet; 85. Second liquid outlet; 86. Material discharge port; 87. Flow channel; 88. Spiral plate; 89. Material discharge hole; 810. Inner shell; 811. Positioning column; 9. Circulating fan; 10. Pulverized coal silo. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution, the technical solution will be described in detail below with reference to the embodiments. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0030] Example 1:

[0031] like Figure 1-2 As shown, the specific structure of this embodiment is as follows: a drying device for pulverized coal production includes a heat exchanger 7, which is connected to a hot air furnace 6 and a cyclone dust collector 8. The heat exchanger 7 includes a front end plate 71 and a rear end plate 72, with a heat-conducting plate 73 disposed between the front end plate 71 and the rear end plate 72. A hot fluid inlet 74, a cold fluid inlet 75, a cold fluid outlet 76, and a hot fluid outlet 77 are disposed on the end face of the front end plate 71. The hot air furnace 6 includes a furnace body 61, with a pipe 62 spirally disposed inside the furnace body 61. The pipe 62 is connected to the cold fluid through a first liquid inlet 63. The outlet 76 is connected, and the pipe 62 is connected to the hot fluid inlet 74 through the first liquid outlet 64; the cyclone dust collector 8 includes a shell 81, and a flow channel 87 is spirally arranged inside the shell 81. The flow channel 87 is connected to the hot fluid outlet 77 through the second liquid inlet 84, and the flow channel 87 is connected to the cold fluid inlet 75 through the second liquid outlet 85. In this embodiment, the fluid is a heat transfer fluid, specifically heat transfer oil. The heat transfer fluid is driven to flow by an external circulation pump in the connecting pipe; an inner shell 810 is detachably installed inside the shell 81, and a spiral plate 88 is arranged on the lower part of the inner wall of the inner shell 810.

[0032] Example 2:

[0033] like Figure 1 As shown, in a preferred embodiment, the upper side of the outer casing 81 is provided with an air inlet 82 communicating with the interior of the outer casing 81, the bottom of the outer casing 81 is provided with a material discharge port 86, and the top center of the outer casing 81 is provided with an air outlet 83 extending into the interior of the outer casing 81. The arrangement of the air inlet 82, material discharge port 86, and air outlet 83 facilitates the installation and connection of the cyclone dust collector 8 of this device to the pulverized coal production line. The device also includes a raw material silo 1, which is connected to a coal mill 2. The coal mill 2 is connected to a screening device 3, the screening device 3 is connected to a coal powder silo 4, the coal powder silo 4 is connected to a buffer tank 5, the buffer tank 5 is connected to the feed end of a hot air furnace 6, the hot air furnace 6 is connected to the cyclone dust collector 8, and the cyclone dust collector 8 is connected to a pulverized coal silo 10. The arrangement of the raw material silo 1, coal mill 2, screening device 3, and coal powder silo 4 ensures that the pulverized coal production line, in conjunction with the drying device, can function fully, making the production and drying workflow more efficient. Air outlet 83 is connected to circulating fan 9, and the air outlet of circulating fan 9 is connected to the air inlet of screening device 3 and hot air furnace 6. Through the arrangement of circulating fan 9 and its connecting structure, the cyclone dust collector 8, screening device 3, and hot air furnace 6 of this device can achieve air circulation, allowing screening device 3 and hot air furnace 6 to reuse exhaust gas and repeatedly filter pulverized coal from the exhaust gas, thus improving production efficiency. The fine material outlet of screening device 3 is connected to coal powder bin 4, and the coarse material outlet of screening device 3 is connected to the feed inlet of coal mill 2. Through the connection structure of screening device 3, the pulverized coal production line used in this drying device can further improve the production efficiency of pulverized coal.

[0034] Example 3:

[0035] like Figure 1 As shown, in a preferred embodiment, the spiral plate 88 is provided with spaced-apart discharge holes 89. The discharge holes 89 further prevent pulverized coal from accumulating on the spiral plate 88, improving the discharge efficiency of the cyclone dust collector 8. The upper end of the inner shell 810 is positioned and connected to the upper end of the outer shell 81 via spaced-apart positioning posts 811. The positioning posts 811 ensure that the inner shell 810 is securely installed within the outer shell 81, preventing it from being rotated by wind.

[0036] Example 4:

[0037] The specific working principle of this invention is as follows:

[0038] When using this device, it needs to be adapted and installed in the pulverized coal production line. The heat exchanger 7 is connected to the hot air furnace 6 and the cyclone dust collector 8. Then the production line is started, and combustion and heat release begin in the furnace body 61. The heat is conducted to the heat exchanger 7 through the first liquid outlet 64 to exchange heat sources. The hot fluid outlet 77 in the heat exchanger 7 introduces the hot fluid into the cyclone dust collector 8 through the second liquid inlet 84. That is, the waste heat produced by the hot air furnace 6 is used to heat the cyclone dust collector 8 and dry the pulverized coal in the cyclone dust collector 8. After air enters from the hot blast stove 6 through the air inlet 82, centrifugal force is used to separate the pulverized coal particles in the flue gas. The separated pulverized coal adheres tightly to the inner wall of the inner shell 810 until it is caught by the spiral plate 88 during its fall. Then, it is continuously blown by the air in the cyclone dust collector 8, rotates around the spiral plate 88, and finally falls out from the discharge port 86. Compared with falling directly from the cyclone dust collector 8, the discharge time is extended, but it does not affect the movement of the pulverized coal in the cyclone dust collector 8. At the same time, the discharge holes 89 on the spiral plate 88 will not cause accumulation, thus extending the heating and drying time of the pulverized coal in the cyclone dust collector 8 after separation. Throughout the entire process described above, the device utilizes the combined action of the hot air furnace 6, heat exchanger 7, and cyclone dust collector 8 to heat and dry the cyclone dust collector 8 using the waste heat generated by the hot air furnace 6. This saves energy, reduces power consumption and production costs, and is more environmentally friendly. At the same time, the spiral plates 88 installed inside the cyclone dust collector 8 catch the pulverized coal particles, extending their heating time within the cyclone dust collector 8 and further improving the drying effect of the device.

[0039] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the present invention. These examples are merely for the purpose of helping to understand the method and core ideas of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that, due to the limitations of written expression and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or variations without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A drying apparatus for pulverized coal production, comprising a heat exchanger (7) connected to a hot blast stove (6) and a cyclone dust collector (8), characterized in that, The heat exchanger (7) includes a front end plate (71) and a rear end plate (72). A heat-conducting plate (73) is provided between the front end plate (71) and the rear end plate (72). A hot fluid inlet (74), a cold fluid inlet (75), a cold fluid outlet (76), and a hot fluid outlet (77) are provided on the end face of the front end plate (71). The hot air furnace (6) includes a furnace body (61). A pipe (62) is provided inside the furnace body (61). The pipe (62) is connected to the cold fluid outlet (76) through a first liquid inlet (63). The pipe (62) is connected to the hot fluid inlet (74) through a first liquid outlet (64). The cyclone dust collector (8) includes a shell (81). A flow channel (87) is provided inside the shell (81). The flow channel (87) is connected to the hot fluid outlet (77) through a second liquid inlet (84). (87) The outer shell (81) is connected to the cold fluid inlet (75) through the second liquid outlet (85). The inner shell (810) is detachably installed inside the outer shell (81). The lower part of the inner wall of the inner shell (810) is provided with a spiral plate (88). The spiral plate (88) is provided with a material drop hole (89) at intervals. The upper side of the outer shell (81) is provided with an air inlet (82) that communicates with the inside of the outer shell (81). The bottom of the outer shell (81) is provided with a material drop hole (86). The center of the top of the outer shell (81) is provided with an air outlet (83) that extends into the inside of the outer shell (81). The air outlet (83) is connected to the circulating fan (9). The air outlet of the circulating fan (9) is connected to the air inlet of the screening device (3) and the hot air furnace (6), so that the screening device (3) and the hot air furnace (6) can reuse the tail gas and can repeatedly filter out pulverized coal from the tail gas.

2. The drying apparatus for pulverized coal production according to claim 1, characterized in that, It also includes a raw material silo (1), which is connected to a coal mill (2), which is connected to a screening device (3), which is connected to a coal powder silo (4), which is connected to a buffer tank (5), which is connected to the feed end of a hot air furnace (6), which is connected to a cyclone dust collector (8), which is connected to a pulverized coal silo (10).

3. A drying apparatus for pulverized coal production according to claim 2, characterized in that, The fine material outlet of the screening device (3) is connected to the coal powder silo (4), and the coarse material outlet of the screening device (3) is connected to the feed inlet of the coal mill (2).

4. A drying apparatus for pulverized coal production according to claim 1, characterized in that, The upper end of the inner shell (810) is positioned and connected to the upper end of the outer shell (81) through spaced positioning posts (811).

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