A roller drying device for slime drying

Abstract

The utility model provides a kind of drum drying device for slime drying, it is related to the technical field of slime drying device, and it includes: base, base top is equipped with horizontal roller, base one side is equipped with control box, control box one side is equipped with steam turbine auxiliary steam header, base one side is equipped with condensate storage tank;Drying assembly is arranged between steam turbine auxiliary steam header and condensate storage tank.This kind of drum drying device is set through drying assembly, can utilize the waste heat steam of steam turbine auxiliary steam header and be introduced into multiple heat exchange pipes through shunt cavity, carry out indirect heating uniformly and efficiently to slime, realize moisture sufficient evaporation, simultaneously, condensate is collected after converging cavity and is transported to condensate storage tank, and is returned to boiler feedwater system by delivery pump, realize working medium and heat energy recovery, effectively reduce energy consumption and water consumption.

Description

Technical Field

[0001] This utility model relates to the technical field of coal slime drying equipment, specifically a drum drying device for coal slime drying. Background Technology

[0002] Coal slime is a byproduct of coal washing and beneficiation. It is characterized by high moisture content, high viscosity, and easy agglomeration. Direct stockpiling not only occupies a large amount of land resources but also easily causes environmental pollution. Furthermore, it still contains considerable calorific value, making it valuable for resource utilization. Therefore, drying coal slime to reduce its moisture content and increase its calorific value is a crucial step in realizing its resource utilization, such as blending for combustion or making briquettes. However, in existing coal slime drying equipment, the condensate generated after steam heat exchange is often directly discharged or simply recycled without fully considering the loss of the working fluid, leading to water waste. Utility Model Content

[0003] This utility model aims to address the shortcomings of the prior art by providing a drum drying device for coal slime drying. To solve the above problems, by setting up the drying components, the waste heat steam from the auxiliary steam header of the steam turbine can be introduced into multiple heat exchange tubes through the diversion chamber to uniformly and efficiently heat the coal slime indirectly, achieving full evaporation of moisture. At the same time, the condensate is collected through the collection chamber and transported to the condensate storage tank, and then returned to the boiler feedwater system through the transfer pump, realizing the recovery of working fluid and heat energy, and effectively reducing energy and water consumption.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a drum drying device for coal slime drying, comprising: a base, a horizontal drum on the top of the base, a control box on one side of the base, a turbine auxiliary steam header on one side of the control box, a condensate storage tank on one side of the base, and a drying assembly disposed between the turbine auxiliary steam header and the condensate storage tank. The drying assembly includes: a rotary joint a on one side of the horizontal drum, one end of the rotary joint a connected to a steam inlet pipe a; a rotary joint b on one side of the turbine auxiliary steam header, one side of the rotary joint b connected to a condensate outlet pipe a; and multiple material guide plates fixedly connected to the inner wall of the horizontal drum, with multiple guide holes opened on one side of each material guide plate.

[0005] Preferably, two support blocks are fixedly connected to the top of the base, and each support block is fixedly connected to a limiting ring. Each limiting ring has a limiting groove inside. An annular limiting block is fixedly connected to the outside of the horizontal roller, and the annular limiting block is slidably connected to the limiting groove. A drive motor is fixedly installed on the top of the base, and a reducer is installed on the top of the base. The rotating shaft at one end of the drive motor is connected to the input shaft on one side of the reducer through a coupling. A gear is connected to one side of the reducer through an output shaft. An annular block is fixedly connected to the outside of the horizontal roller, and multiple tooth grooves are opened on the outside of the annular block. The gear meshes with the multiple tooth grooves.

[0006] Preferably, the top of the horizontal drum is connected to a feed pipe, the top of the horizontal drum is connected to a discharge pipe, the discharge pipe is equipped with a discharge moisture content sensor, the discharge pipe is equipped with a coal slime flow sensor below the discharge pipe, the feed pipe is equipped with a feed moisture content sensor, and the top of the feed pipe and the bottom of the discharge pipe are both threadedly connected with sealing caps.

[0007] Preferably, the horizontal drum has a flow distribution chamber and a condensate collection chamber inside. Multiple heat exchange tubes are arranged on the inner wall of the horizontal drum. One end of each heat exchange tube extends into the flow distribution chamber, and the other end extends into the condensate collection chamber. One end of the rotary joint a is connected to a steam inlet pipe a, which extends into the flow distribution chamber. One end of the rotary joint b is connected to a condensate outlet pipe a, which extends into the condensate collection chamber. One end of the rotary joint a is connected to an extraction steam pipe, which is connected to the turbine auxiliary steam header. One end of the rotary joint b is connected to a condensate outlet pipe b, which is connected to a condensate storage tank. One end of the condensate storage tank is connected to a water pipe, which is connected to a delivery pump. The delivery pump is connected to an outlet pipe.

[0008] Preferably, the steam inlet pipe a is equipped with a steam temperature sensor and a steam pressure sensor, and the condensate outlet pipe a is equipped with a condensate temperature sensor and a condensate pressure sensor.

[0009] Preferably, the steam extraction pipeline is equipped with a pressure reducing and stabilizing valve and a steam flow meter, the condensate outlet pipe b is equipped with a drain valve, and the condensate storage tank is equipped with a liquid level sensor and a temperature sensor.

[0010] Preferably, one end of the outlet pipe is connected to the boiler feedwater system, and a check valve is provided on the outlet pipe.

[0011] This utility model provides a drum drying device for coal slime drying, which has the following beneficial effects:

[0012] The advantages of this invention are that, through the setting of the drying component, the waste heat steam in the auxiliary steam header of the steam turbine can be introduced into the diversion chamber inside the horizontal drum, and the heat can be evenly released through multiple heat exchange tubes to efficiently and indirectly heat the coal slime, so that the moisture can be fully evaporated. At the same time, the condensate formed after the steam is condensed is collected in the condensate collection chamber, and discharged into the condensate storage tank through the condensate outlet pipe and the condensate outlet pipe. Then, it is transported to the boiler feedwater system through the transfer pump, realizing the recovery of working fluid and the reuse of heat energy, significantly reducing energy consumption and water consumption.

[0013] Secondly, by setting up the material-pushing plate and its guide holes, the coal slurry can be effectively scooped up and thrown during the rotation of the horizontal drum, so that it repeatedly contacts the surface of the heat exchange tube, improving the heat transfer efficiency, while avoiding material accumulation and blockage, and ensuring the continuous and stable drying process. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a cross-sectional view of the overall structure of this utility model.

[0016] Figure 3 This is a cross-sectional view of the flow divider structure of this utility model.

[0017] Figure 4 This is a cross-sectional view of the condensate collection chamber structure of this utility model.

[0018] Figure 5 This is a cross-sectional schematic diagram of the limiting ring structure of this utility model.

[0019] Figure 6 For the present utility model Figure 2 Enlarged view of point A.

[0020] Figure 7 For the present utility model Figure 2 Enlarged view of point B.

[0021] Figure 8 For the present utility model Figure 2 Enlarged view of point C.

[0022] Figure 1-8Components: 1. Base; 101. Support block; 102. Limiting ring; 103. Limiting groove; 104. Control box; 2. Horizontal drum; 201. Annular limiting block; 202. Annular block; 203. Tooth groove; 204. Gear; 205. Reducer; 206. Drive motor; 207. Feed pipe; 208. Discharge pipe; 209. Coal slime flow sensor; 3. Feeding plate; 301. Guide hole; 4. Steam turbine auxiliary steam header; 401. Steam extraction pipe; 402. Rotary joint a; 403. Steam inlet pipe a; 404. Diverting chamber; 405. Heat exchanger tube; 406. Condensate collection chamber; 407. Condensate outlet pipe a; 408. Rotary joint b; 409. Condensate outlet pipe b; 5. Condensate storage tank; 6. Conveying pump; 601. Water pipe; 602. Outlet pipe. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0024] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0025] This application provides a rotary drum dryer for coal slime drying. This dryer utilizes waste heat steam from the turbine auxiliary steam header, which is introduced through a distribution chamber into multiple heat exchange tubes to uniformly and efficiently heat the coal slime indirectly, achieving full evaporation of moisture. Simultaneously, condensate is collected in a collecting chamber and transported to a condensate storage tank, then pumped back to the boiler feedwater system, achieving working fluid and heat energy recovery and effectively reducing energy and water consumption. The rotary drum dryer for coal slime drying is described in detail below. It should be noted that the order of description in the following embodiments is not intended to limit the preferred order of embodiments.

[0026] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] Please see Figure 1-8 In this embodiment, a drum drying device for coal slime drying is provided, including: a base 1, a horizontal drum 2 on the top of the base 1, a control box 104 on one side of the base 1, a turbine auxiliary steam header 4 on one side of the control box 104, and a condensate storage tank 5 on one side of the base 1; a drying assembly located between the turbine auxiliary steam header 4 and the condensate storage tank 5, the drying assembly including: a rotary joint a402 on one side of the horizontal drum 2, one end of the rotary joint a402 connected to a steam inlet pipe a403, a rotary joint b408 on one side of the turbine auxiliary steam header 4, one side of the rotary joint b408 connected to a condensate outlet pipe a407, and multiple material guide plates 3 fixedly connected to the inner wall of the horizontal drum 2, with multiple guide holes 301 opened on one side of the material guide plates 3.

[0028] The drying components allow waste heat steam from the turbine auxiliary steam header 4 to be introduced into the distribution chamber 404 inside the horizontal drum 2. Heat is then evenly released through multiple heat exchange tubes 405 to efficiently and indirectly heat the coal slime, allowing the moisture to evaporate fully. Meanwhile, the condensate formed after steam condensation is collected in the condensate collection chamber 406 and discharged into the condensate storage tank 5 through the condensate outlet pipe a407 and the condensate outlet pipe b409. The condensate is then transported to the boiler feedwater system by the transfer pump 6, realizing the recovery of working fluid and the reuse of heat energy, significantly reducing energy consumption and water consumption.

[0029] Secondly, by setting the material-pushing plate 3 and the guide hole 301 on it, the coal slurry can be effectively picked up and thrown during the rotation of the horizontal drum 2, so that it repeatedly contacts the surface of the heat exchange tube 405, thereby enhancing the heat transfer efficiency and avoiding material accumulation and blockage, thus ensuring the continuous and stable drying process.

[0030] The base 1 has two support blocks 101 fixedly connected to its top. Each support block 101 has a limit ring 102 fixedly connected to its top. Each limit ring 102 has a limit groove 103 inside. The horizontal roller 2 has an annular limit block 201 fixedly connected to its outer side. The annular limit block 201 is slidably connected to the limit groove 103. The base 1 has a drive motor 206 fixedly installed on its top. The base 1 also has a reducer 205 installed on its top. The rotating shaft at one end of the drive motor 206 is connected to the input shaft on one side of the reducer 205 via a coupling. The reducer 205 has a gear 204 connected to its output shaft on one side. The horizontal roller 2 has an annular block 202 fixedly connected to its outer side. The annular block 202 has multiple tooth grooves 203 on its outer side. The gear 204 meshes with the multiple tooth grooves 203.

[0031] In use, unscrew the cap on the feed pipe 207 and pour an appropriate amount of coal slurry into the horizontal drum 2 from the feed pipe 207. Then, screw the cap back onto the top of the feed pipe 207. Next, allow the steam in the turbine auxiliary steam header 4 to enter the diversion chamber 404 through the extraction pipe 401, rotary joint a402 and steam inlet pipe a403. The steam is then diverted through the diversion chamber 404 to multiple heat exchange tubes 405. At this time, the heat exchange tubes 405 absorb the heat from the steam and transfer it to the coal slurry, causing the coal slurry to absorb heat and evaporate the moisture inside the coal slurry.

[0032] Furthermore, the controller activates the drive motor 206, which drives the input shaft of the reducer 205, causing the output shaft of the reducer 205 to rotate the gear 204. This, in turn, causes the annular block 202 and the horizontal drum 2 to rotate. At this time, the annular limiting block 201 on the outer side of the horizontal drum 2 slides inside the limiting groove 103 to maintain the stability of the rotation of the horizontal drum 2. The rotary joints a402 and b408 ensure that the condensate outlet pipe b409 and the steam extraction pipe 401 do not obstruct the movement of the horizontal drum 2 during its rotation. As the horizontal drum 2 rotates, the internal material-lifting plate 3 scoops up the coal slime until the plate reaches the top of the drum 2, after which the slime slides down, ensuring sufficient contact between the coal slime and the multiple heat exchange tubes 405. After the coal slime is dried, the sealing cap at the bottom of the discharge pipe 208 can be unscrewed to discharge the slime.

[0033] The drive motor 206 uses a built-in encoder to detect the position and speed of the rotating shaft in real time and transmits the feedback signal to the driver. The driver compares the actual values ​​with the control commands and uses a closed-loop control algorithm to dynamically adjust the motor's current and torque, thereby precisely controlling the rotation angle and speed. When the target position is reached, the system continues to monitor the position deviation. Once an external force causes a deviation, the driver immediately outputs a reverse torque to pull the rotating shaft back to its original position, achieving electronic locking of the rotating shaft. This feedback-based closed-loop control mechanism enables the drive motor 206 to move precisely and maintain a stable position. Furthermore, since the rotation angle and speed control of the drive motor 206 and the electronic locking of the rotation are mature and conventional technologies, they will not be described in detail further.

[0034] In addition, the inner wall of the horizontal drum 2 is equipped with a heat insulation layer made of aluminum silicate fiber material with a thickness of 50-80mm to reduce heat loss of the equipment. The angle between the material feeding plate 3 and the axis of the horizontal drum 2 is 30°-45° and the diameter of the guide hole is 8-12mm to ensure that the coal slime is evenly turned over and improve the heat exchange uniformity. A pressure relief valve is also provided on the outside of the horizontal drum 2.

[0035] The horizontal drum 2 is connected to the top of the feed pipe 207 and the top of the discharge pipe 208. The discharge pipe 208 is equipped with a discharge moisture content sensor and a coal slime flow sensor 209 is installed below the discharge pipe 208. The feed pipe 207 is equipped with a feed moisture content sensor. The top of the feed pipe 207 and the bottom of the discharge pipe 208 are both threaded with sealing caps.

[0036] Furthermore, the feed moisture content sensor inside the feed pipe 207, the discharge moisture content sensor inside the discharge pipe 208, and the coal slime flow sensor below the discharge pipe 208 can calculate the coal slime processing volume and the amount of moisture evaporation. The feed moisture content sensor and the discharge moisture content sensor are microwave sensors, and the coal slime flow sensor is a belt scale.

[0037] The horizontal drum 2 has a flow distribution chamber 404 and a condensate collection chamber 406 inside. Multiple heat exchange tubes 405 are installed on the inner wall of the horizontal drum 2. One end of each heat exchange tube 405 extends into the flow distribution chamber 404, and the other end extends into the condensate collection chamber 406. One end of a rotary joint a402 is connected to a steam inlet pipe a403, which extends into the flow distribution chamber 404. One end of a rotary joint b408 is connected to a condensate outlet pipe a. 407, one end of the condensate outlet pipe a407 extends into the condensate collection chamber 406, one end of the rotary joint a402 is connected to the extraction steam pipe 401, one end of the extraction steam pipe 401 is connected to the turbine auxiliary steam header 4, one end of the rotary joint b408 is connected to the condensate outlet pipe b409, one end of the condensate outlet pipe b409 is connected to the condensate storage tank 5, one end of the condensate storage tank 5 is connected to the water pipe 601, one end of the water pipe 601 is connected to the transfer pump 6, and one end of the transfer pump 6 is connected to the outlet pipe 602.

[0038] When the steam cools down, condensate will form inside the heat exchange tube 405. Under the pressure of the steam, the condensate enters the condensate collection chamber 406 and flows into the condensate storage tank 5 through the condensate outlet pipe a407, rotary joint b408 and condensate outlet pipe b409. Then, the condensate inside the condensate storage tank 5 is extracted by the transfer pump 6 and enters the boiler feedwater system through the water pipe 601 and outlet pipe 602, reducing working fluid loss and reducing energy and water consumption.

[0039] The steam inlet pipe A403 is equipped with a steam temperature sensor and a steam pressure sensor, while the condensate outlet pipe A407 is equipped with a condensate temperature sensor and a condensate pressure sensor. The steam temperature sensor and steam pressure sensor inside the steam inlet pipe A403 can collect the steam inlet enthalpy value to calculate the required steam temperature and steam pressure. Similarly, the condensate temperature sensor and condensate pressure sensor inside the condensate outlet pipe A407 can collect the condensate outlet enthalpy value to calculate the required condensate temperature and condensate pressure.

[0040] The extraction steam pipe 401 is equipped with a pressure reducing and stabilizing valve and a steam flow meter, the condensate outlet pipe b409 is equipped with a steam trap, and the condensate storage tank 5 is equipped with a liquid level sensor and a temperature sensor. The steam flow meter can detect the steam flow rate, and the steam flow meter adopts a vortex flow meter. The steam trap on the condensate outlet pipe b409 can discharge the condensate and air in the steam system, while preventing fresh steam leakage to the greatest extent.

[0041] One end of the outlet pipe 602 is connected to the boiler feedwater system, and a check valve is installed on the outlet pipe 602.

[0042] In use, by setting the liquid level sensor and temperature sensor inside the condensate storage tank 5, the delivery pump 6 can be automatically started when the condensate inside the condensate storage tank 5 accumulates to a certain level and the temperature is suitable, so as to deliver the condensate inside the condensate storage tank 5 to the boiler feedwater system.

[0043] In addition, a controller and human-machine interface are provided on one side of the control box 104. The control box 104 is equipped with a data processing module and an early warning module. The controller is electrically connected to the drive motor 206, the pressure reducing and stabilizing valve, the delivery pump 6 and various sensors. The data processing module has a built-in thermal balance algorithm, which can stabilize the steam pressure and dynamically adjust the operating parameters based on the data collected by each sensor and the pressure reducing and stabilizing valve on the steam inlet pipe a403. Furthermore, through the setting of the turbine auxiliary steam header 4, it can receive steam from different sources, adjust the steam pressure and temperature, and then distribute it to the auxiliary equipment that needs steam.

[0044] The working principle is as follows:

[0045] In use, coal slurry is poured into the horizontal drum 2 through the feed pipe 207, and then the drive motor 206 is turned on. The drive motor 206, along with the driver and encoder, and the reducer 205, drives the gear 204 to rotate the ring block 202, so as to set the speed of the horizontal drum 2 to a suitable speed. At this time, the rotary joints a402 and b408 ensure that the condensate outlet pipe b409 and the steam extraction pipe 401 do not obstruct the movement of the horizontal drum 2 when it rotates. When the horizontal drum 2 rotates, the coal slurry is picked up by the material-lifting plate 3 inside it until the material-lifting plate 3 rotates to the top of the horizontal drum 2, and then slides down along the material-lifting plate 3, so that the coal slurry can fully contact the multiple heat exchange tubes 405.

[0046] Then, the pressure reducing and stabilizing valve on the steam inlet pipe a403 is opened to stabilize the steam pressure. Steam is then introduced into multiple heat exchange tubes 405 through the rotary joint a402 and the steam inlet pipe a403. At this time, the heat exchange tubes 405 absorb the heat from the steam and transfer it to the coal slurry, causing the coal slurry to absorb heat and evaporate the moisture inside the coal slurry. When the steam cools down, condensate will form inside the heat exchange tubes 405. The condensate enters the condensate collection chamber 406 under the pressure of the steam and flows into the condensate storage tank 5 from the condensate outlet pipe a407, rotary joint b408, and condensate outlet pipe b409. Then, the condensate inside the condensate storage tank 5 is extracted by the transfer pump 6 and enters the boiler feedwater system through the water pipe 601 and the outlet pipe 602, reducing working fluid loss and reducing energy and water consumption.

[0047] After the coal slime has been dried, unscrew the cap at the bottom of the discharge pipe 208 to discharge the coal slime.

[0048] Furthermore, the steam temperature sensor, steam pressure sensor, feed moisture content sensor, discharge moisture content sensor, coal slime flow sensor, condensate temperature sensor, and condensate pressure sensor acquire data once per minute, while the data processing module inside the control box 104 calculates the steam heat exchange efficiency once every five minutes.

[0049] When the moisture content of the coal slime feed increases or the steam pressure inside the heat exchange tube 405 decreases to a certain level, the data processing module inside the control box 104 calculates the required steam flow rate, and then the controller on the control box 104 controls the opening of the pressure reducing and stabilizing valve on the steam inlet pipe a403 to increase the steam supply. When the liquid level inside the condensate storage tank 5 reaches a certain level, the delivery pump 6 is started to deliver the condensate inside the condensate storage tank 5 to the boiler feedwater system through the outlet pipe 602.

[0050] The control program involved in this utility model can be implemented by those skilled in the art based on the same or similar principles in the prior art, and this part is not the innovation of this utility model.

[0051] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0052] The above provides a detailed description of a rotary drum dryer for coal slime drying provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A drum drying device for coal slime drying, characterized in that, include: The base (1) has a horizontal roller (2) on its top, a control box (104) on one side of the base (1), a turbine auxiliary steam header (4) on one side of the control box (104), and a condensate storage tank (5) on one side of the base (1). A drying assembly is provided between the turbine auxiliary steam header (4) and the condensate storage tank (5). The drying assembly includes: a rotary joint a (402) on one side of the horizontal drum (2), a steam inlet pipe a (403) connected to one end of the rotary joint a (402), a rotary joint b (408) on one side of the turbine auxiliary steam header (4), a condensate outlet pipe a (407) connected to one side of the rotary joint b (408), and multiple material guide plates (3) fixedly connected to the inner wall of the horizontal drum (2). Multiple guide holes (301) are opened on one side of the material guide plates (3).

2. The rotary drum dryer for coal slime drying according to claim 1, characterized in that, The base (1) has two support blocks (101) fixedly connected to its top. Each of the two support blocks (101) has a limiting ring (102) fixedly connected to its top. Each of the two limiting rings (102) has a limiting groove (103) inside. The horizontal roller (2) has an annular limiting block (201) fixedly connected to its outer side. The annular limiting block (201) is slidably connected to the limiting groove (103). The base (1) has a drive motor (206) fixedly installed on its top. The base (1) has a reducer (205) installed on its top. The rotating shaft at one end of the drive motor (206) is connected to the input shaft on one side of the reducer (205) via a coupling. The reducer (205) has a gear (204) connected to its output shaft on one side. The horizontal roller (2) has an annular block (202) fixedly connected to its outer side. The annular block (202) has multiple tooth grooves (203) on its outer side. The gear (204) meshes with the multiple tooth grooves (203).

3. The rotary drum dryer for coal slime drying according to claim 1, characterized in that, The top of the horizontal drum (2) is connected to a feed pipe (207), and the top of the horizontal drum (2) is connected to a discharge pipe (208). The discharge pipe (208) is equipped with a discharge moisture content sensor, and a coal slime flow sensor (209) is installed below the discharge pipe (208). The feed pipe (207) is equipped with a feed moisture content sensor, and the top of the feed pipe (207) and the bottom of the discharge pipe (208) are both threaded with sealing caps.

4. The rotary drum dryer for coal slime drying according to claim 1, characterized in that, The horizontal drum (2) has a flow distribution chamber (404) and a condensate collection chamber (406) inside. Multiple heat exchange tubes (405) are provided on the inner wall of the horizontal drum (2). One end of each heat exchange tube (405) extends into the flow distribution chamber (404), and the other end extends into the condensate collection chamber (406). One end of the rotary joint a (402) is connected to a steam inlet pipe a (403), and the other end of the steam inlet pipe a (403) extends into the flow distribution chamber (404). One end of the rotary joint b (408) is connected to a condensate outlet pipe a (406). 7) One end of the condensate outlet pipe a (407) extends into the condensate collection chamber (406). One end of the rotary joint a (402) is connected to the extraction steam pipe (401). One end of the extraction steam pipe (401) is connected to the turbine auxiliary steam header (4). One end of the rotary joint b (408) is connected to the condensate outlet pipe b (409). One end of the condensate outlet pipe b (409) is connected to the condensate storage tank (5). One end of the condensate storage tank (5) is connected to the water pipe (601). One end of the water pipe (601) is connected to the delivery pump (6). One end of the delivery pump (6) is connected to the outlet pipe (602).

5. The rotary drum dryer for coal slime drying according to claim 4, characterized in that, The steam inlet pipe a (403) is equipped with a steam temperature sensor and a steam pressure sensor, and the condensate outlet pipe a (407) is equipped with a condensate temperature sensor and a condensate pressure sensor.

6. The drum drying apparatus for coal slime drying according to claim 4, characterized in that, The extraction steam pipe (401) is equipped with a pressure reducing and stabilizing valve and a steam flow meter, the condensate outlet pipe b (409) is equipped with a drain valve, and the condensate storage tank (5) is equipped with a liquid level sensor and a temperature sensor.

7. The rotary drum dryer for coal slime drying according to claim 4, characterized in that, One end of the outlet pipe (602) is connected to the boiler feedwater system, and a check valve is provided on the outlet pipe (602).

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