Modular coal slime drying system

Abstract

The invention discloses a modular coal slime drying system, which relates to the technical field of coal slime drying and resource recycling, and comprises a ball pressing device, a modular coal slime drying box and a screw feeder which are connected in sequence, the ball pressing equipment is responsible for pressing coal slime into small balls; a drying structure is arranged in the modular coal slime drying box and used for drying small balls. According to the spiral feeder, on one hand, dried small balls are conveyed, and on the other hand, blades rotate to collide with the freely falling small balls, so that coal slime is broken and scattered. Wastewater and waste gas of a power plant can be used as drying heat sources, through modular design, the coal slime is reversed for multiple times in a space range, and the retention time of the coal slime in the module is guaranteed by prolonging the moving path of the coal slime, so that the purpose of drying the coal slime is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of slime drying and resource recycling, and particularly relates to a modular slime drying system. Background Art

[0002] The statements in this section only provide background information related to the present disclosure and may not constitute prior art.

[0003] Raw coal is the main fuel for thermal power plants, and the price of raw coal directly affects the economy of the project. Many power plants are coal-electricity joint venture projects, with mining areas, coal preparation plants, etc. around them. The coal burned by power plants is mainly medium-washed coal. Although it is medium-washed coal, the price is still relatively high. Affected by market supply and demand, the price of raw coal per ton is between 600 and 1000 yuan. As a by-product of coal washing in coal preparation plants, slime takes up a large amount of land when piled up, which does not conform to the national land use policy. However, slime still has a certain calorific value, especially after drying, the calorific value increases significantly, and it can be used as a fuel for power plants for co-firing. The price of slime is extremely low. Some mining areas give it away for free in order to dispose of slime, while some mining areas sell it at a price of 50 - 250 yuan per ton.

[0004] If a power plant can dry the slime produced by a coal preparation plant, reduce its moisture content, and replace part of the raw coal, then through the price difference between slime and raw coal, the profit of the power plant can be greatly increased. Power plants usually use tube-type dryers, drum dryers, and disc dryers to dry slime. These types of equipment are all customized equipment, mostly using steam as the heat source, with complex systems and high energy consumption. The present invention aims to explore a new slime drying technology to make the drying equipment movable, interchangeable, with low failure rate, and a simple system. Summary of the Invention

[0005] The purpose of the present invention is to provide a modular slime drying system for the problems existing in the prior art. It uses the waste water and waste gas of a power plant as the drying heat source. Through modular design, the slime is reversed multiple times within a spatial range, and by extending the movement path of the slime, the residence time of the slime in the module is ensured to achieve the purpose of slime drying.

[0006] The technical solution of the present invention is as follows:

[0007] A modular slime drying system includes a briquetting device, a modular slime drying box, and a screw feeder connected in sequence; the briquetting device is responsible for pressing the slime into small balls; a drying structure is arranged inside the modular slime drying box for drying the small balls; on the one hand, the screw feeder realizes the conveying of the dried small balls, and on the other hand, the rotation of the blades collides with the freely falling small balls to break and disperse the slime.

[0008] Further, a hopper is provided at the upper entrance of the briquetting equipment for pouring in the collected slime.

[0009] Further, a slime drying oven inlet is provided above the modular slime drying oven, and a dried slime discharge port is provided below it; a scraper conveyor is provided at the discharge port below the briquetting equipment for conveying the small balls to the slime drying oven inlet; the screw feeder is provided at the dried slime discharge port.

[0010] Further, a scraper distributor is provided at the slime drying oven inlet.

[0011] Further, the drying structure includes: multiple groups of hollow plates arranged in a W shape, drying channels are provided on the hollow plates, and a heat source is introduced into the hollow plates; the small balls slowly roll along the direction of the drying channels, and when reaching the end of one hollow plate, they naturally fall to the lower-layer hollow plate.

[0012] Further, the hollow plates are arranged at an angle of 2°.

[0013] Further, a water vapor discharge port is provided on the side of the modular slime drying oven near the top.

[0014] Further, N groups of exhaust fans are provided at the water vapor discharge port. On the one hand, the moisture separated from the dried slime is led out, and on the other hand, the disturbance of the air is increased to accelerate the drying process.

[0015] Further, 3 groups of exhaust fans are provided at the water vapor discharge port.

[0016] Further, a vibration device is also provided outside the modular slime drying oven, which is controlled by a program and is used to clean the slime dust peeled off during the drying process.

[0017] The beneficial effects of the present invention compared with the existing technology are as follows:

[0018] 1. A modular slime drying system, including a briquetting equipment, a modular slime drying oven and a screw feeder connected in sequence; the briquetting equipment is responsible for pressing the slime into small balls; a drying structure is provided inside the modular slime drying oven for drying the small balls; the screw feeder not only realizes the conveying of the dried small balls, but also the rotation of the blades collides with the freely falling small balls to break and disperse the slime. It uses the waste water and waste gas of the power plant as the drying heat source. Through modular design, the slime changes direction multiple times within a spatial range, and by extending the moving path of the slime, the residence time of the slime in the module is guaranteed to achieve the purpose of slime drying.

[0019] 2. The outer dimensions of the modular slime drying oven proposed by the present invention are controlled within the dimensions of a container, which is convenient for transportation and does not require large-piece transportation costs and road and bridge reinforcement costs.

[0020] 3. The drying equipment of the present invention is made into modules, which are simple to install, have low maintenance requirements, and are interchangeable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of a modular coal slime drying system;

[0022] Figure 2 It is a schematic structural diagram of a modular coal slime drying system from another perspective.

[0023] Reference numerals: 1 - briquetting equipment, 2 - modular coal slime drying box, 3 - screw feeder, 4 - hopper, 5 - inlet of coal slime drying box, 6 - outlet of dried coal slime, 7 - scraper conveyor, 8 - scraper distributor, 9 - hollow plate, 10 - drying channel, 11 - water vapor discharge port, 12 - header tank, 13 - heat source outlet, 14 - heat source inlet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0025] The features and performance of the present invention will be further described in detail below in conjunction with embodiments.

[0026] Embodiment 1

[0027] Please refer to Figure 1 and Figure 2 , a modular coal slime drying system, comprising:

[0028] A briquetting equipment 1, a modular coal slime drying box 2 and a screw feeder 3 connected in sequence;

[0029] The briquetting equipment 1 is responsible for pressing the coal slime into small balls; the modular coal slime drying box 2 is internally provided with a drying structure for drying the small balls; the screw feeder 3 not only realizes the conveying of the dried small balls, but also the rotation of the blades collides with the freely falling small balls to break and disperse the coal slime.

[0030] In this embodiment, it should be noted that the outlet of the screw feeder 3 can be connected to various conveying devices to be transported to a distance, or a collecting hopper 4 can be installed for centralized collection. This embodiment does not limit this here, and any connection form is within the protection scope of this application.

[0031] In this embodiment, specifically, a hopper 4 is provided at the upper inlet of the briquetting device 1 for pouring in the collected coal slime.

[0032] During use, the coal slime can be loaded into the hopper 4 by a grab bucket or a forklift. The hopper 4 is connected to the existing briquetting device 1 on the market below, and all the coal slime is briquetted into small balls of the same diameter.

[0033] In this embodiment, specifically, a coal slime drying box inlet 5 is provided above the modular coal slime drying box 2, and a dried coal slime discharge port 6 is provided below; a scraper conveyor 7 is provided at the discharge port below the briquetting device 1 for transporting the small balls to the coal slime drying box inlet 5; the screw feeder 3 is provided at the dried coal slime discharge port 6.

[0034] In this embodiment, specifically, a scraper distributor 8 is provided at the coal slime drying box inlet 5.

[0035] In this embodiment, specifically, the drying structure includes: multiple groups of hollow plates 9 arranged in a W shape. Drying channels 10 are provided on the hollow plates 9, and a heat source is introduced into the hollow plates 9; the small balls slowly roll along the direction of the drying channels 10. When reaching the end of one hollow plate 9, they naturally fall to the lower-layer hollow plate 9.

[0036] It should be noted that by introducing a heat source into the hollow plates 9, the surface temperature of the plates can reach 60 - 80 °C, thereby drying the small balls above the hollow plates 9.

[0037] In this embodiment, it should be noted that the heat source in the hollow plates 9 comes from the wastewater and waste gas of the power plant. That is, this system uses the wastewater and waste gas of the power plant as the drying heat source. Through modular design, the coal slime changes direction multiple times within a space range, and by extending the moving path of the coal slime, the residence time of the coal slime in the module is ensured to achieve the purpose of coal slime drying. It should be noted that the hollow plates 9 are connected through branch pipes, so that all the hollow plates 9 are filled with gas or liquid to keep the temperature of the hollow plates 9 constant.

[0038] In this embodiment, it should be noted that the heat source can be connected to the hollow plates 9 through the header 12. The heat source outlet 13 and the heat source inlet 14 are respectively provided at both ends of the header 12 to ensure the normal flow of the heat source.

[0039] In this embodiment, specifically, the hollow plates 9 are arranged at an angle of 2°. It should be noted that due to the slope setting, the small balls can slide downward in the drying channel 10 under the action of gravity without the need to provide additional force. At the same time, the angle of 2° is an angle with good use effect obtained by the applicant through a large number of experiments. On the one hand, it can ensure that the small balls can slide downward in the drying channel 10 under the action of gravity without clogging problems. On the other hand, it greatly extends the time of the small balls in the drying channel 10 to achieve sufficient drying.

[0040] In this embodiment, specifically, a water vapor discharge port 11 is provided on the side of the modular coal slime drying box 2 close to the top.

[0041] In this embodiment, specifically, 3 exhaust fans are provided at the water vapor discharge port 11. On the one hand, the moisture separated from the dried coal slime is led out, and on the other hand, the disturbance of the air is increased to accelerate the drying process.

[0042] In this embodiment, specifically, a vibration device is further provided outside the modular coal slime drying box 2, which is controlled by a program and is used to clean the coal slime dust peeled off during the drying process;

[0043] For example, the program control is as follows: after each batch of materials is dried, it vibrates for 3 minutes to clean the coal slime dust peeled off during the drying process, keep the channel clean, and facilitate the secondary feeding and drying.

[0044] In this embodiment, it should be noted that the modular coal slime drying box 2 belongs to modular design. The floor area of a single module is 2.4m×13m×3m, which is equivalent to the size of a 45-foot high-cube container, facilitating transportation and there will be no situation where existing road bridges cannot pass. The modular coal slime drying box 2 can also be reused and has interchangeability.

[0045] Embodiment Two

[0046] Based on the modular coal slime drying system proposed in Embodiment One, Embodiment Two also proposes a modular coal slime drying method, which specifically includes the following steps:

[0047] Step S1: First, load the coal slime into the hopper 4 through a grab or a forklift. The hopper 4 is connected to the existing briquetting equipment 1 on the market below, and all the coal slime is pressed into small balls with the same diameter;

[0048] Step S2: The small balls enter the interior of the modular coal slime drying box 2 through the scraper conveyor 7 and flow along the drying channel 10 inside the modular coal slime drying box 2; when reaching the end of a hollow plate 9, they naturally fall to the lower-layer hollow plate 9 until reaching the dry coal slime discharge port 6;

[0049] Step S3: The dried small balls enter the screw feeder 3 through the dry slime discharge port 6, realizing the transportation of materials on the one hand, and on the other hand, the rotation of the blades collides with the freely falling small balls, breaking and dispersing the slime.

[0050] In this embodiment, it should be noted that the vibration device can also be controlled by a program; when each batch of materials is dried, it is vibrated for 3 minutes to clean the slime dust peeled off during the drying process, keep the flow channel clean, and facilitate secondary feeding and drying.

[0051] In this embodiment, it should be noted that during the drying process, the moisture separated from the dried slime can also be led out through the water vapor discharge port 11 provided on the side near the top of the modular slime drying box 2, while increasing the disturbance of the air and accelerating the drying process.

[0052] The above-described embodiments only represent the specific implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the protection scope of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the technical solution of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application.

[0053] This background art section is provided to generally present the context of the present invention. The work of the currently named inventors, to the extent described in this background art section, and aspects of this section that do not constitute prior art at the time of filing this application are neither expressly nor impliedly admitted to be prior art to the present invention.

Claims

1. A modular slime drying system, characterized in that Including: A briquetting device, a modular coal slime dryer, and a screw feeder connected in sequence; the briquetting device is responsible for pressing the coal slime into small balls; a drying structure is arranged inside the modular coal slime dryer for drying the small balls; the screw feeder realizes the transportation of the dried small balls on the one hand, and on the other hand, the rotation of the blades collides with the freely falling small balls to break and disperse the coal slime.

2. The modular slime drying system according to claim 1, characterized in that A hopper is arranged at the upper entrance of the briquetting device for pouring the collected coal slime.

3. The modular slime drying system according to claim 2, wherein A coal slime dryer inlet is arranged above the modular coal slime dryer, and a dry coal slime discharge port is arranged below; a scraper conveyor is arranged at the discharge port below the briquetting device for transporting the small balls to the coal slime dryer inlet; the screw feeder is arranged at the dry coal slime discharge port.

4. A modular slime drying system according to claim 3, wherein, A scraper distributor is arranged at the coal slime dryer inlet.

5. The modular slime drying system according to claim 3, characterized in that, The drying structure includes: multiple groups of hollow plates arranged in a W shape, drying channels are provided on the hollow plates, and a heat source is introduced into the hollow plates; the small balls slowly roll along the direction of the drying channels, and when reaching the end of one hollow plate, they naturally fall to the lower-layer hollow plate.

6. The modular slime drying system according to claim 5, wherein, The hollow plates are arranged at an angle of 2°.

7. A modular slime drying system according to claim 3, characterized in that, A water vapor discharge port is arranged on the side of the modular coal slime dryer close to the top.

8. A modular slime drying system according to claim 7, characterized in that, N groups of exhaust fans are arranged at the water vapor discharge port. On the one hand, the moisture precipitated from the dried coal slime is led out, and on the other hand, the air disturbance is increased to accelerate the drying process.

9. The modular slime drying system according to claim 8, wherein, 3 groups of exhaust fans are arranged at the water vapor discharge port.

10. A modular slime drying system according to claim 1, characterized in that, A vibration device is also arranged outside the modular coal slime dryer, which is controlled by a program and is used to clean the coal slime dust peeled off during the drying process.

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