Waste heat utilization system for clean briquette production line

Abstract

The utility model discloses a clean briquette production line waste heat utilization system which comprises a shell and an air inlet pipe arranged at the top of the shell, the inner space of the shell is divided into an anti-escape chamber, a heat exchange chamber and an exhaust chamber, an air distribution groove is machined in an air distribution block, and a lifting plate is connected in an annular space between the air inlet pipe and the air distribution groove in a sealed and sliding mode. A plurality of sets of vent holes are formed in the bottom and the side wall of the air distribution groove from bottom to top, a plurality of sets of heat exchange pipes are concentrically arranged in the heat exchange chamber, a rotating shaft is arranged in each heat exchange pipe, spiral blades are arranged on the rotating shafts, the lower ends of the rotating shafts extend out of the shell and then are in transmission connection with a driving mechanism, and a vertical cylinder is arranged between every two adjacent sets of heat exchange pipes. The vertical cylinders divide the heat exchange chamber into a plurality of heat exchange cavities, the shell is provided with an inlet pipe and an outlet pipe which are communicated with the heat exchange cavities, and the exhaust chamber is provided with an exhaust port. In conclusion, the waste heat recovery device has the advantages of high waste heat absorption efficiency, less heat waste and high recovery utilization rate.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery and utilization, in particular to a waste heat utilization system for a clean coal production line. Background Art

[0002] The production process of clean coal briquettes generally begins with purchasing qualified raw coal from a coal preparation plant. After being crushed, screened, and metered, the raw coal is then mixed with asphalt, tar, and additives. After mixing, it is heated and insulated. After this, it is formed into semi-finished briquettes. The semi-finished briquettes are then carbonized in a carbonization furnace and finally quenched to produce finished briquettes. Each of these processes, including heating and insulating, forming, carbonizing, and quenching, generates a certain amount of waste gas. This waste gas contains a large amount of heat. To minimize heat loss and prevent thermal pollution, the waste heat in this waste gas needs to be recovered and utilized.

[0003] Existing waste heat recovery systems for clean coal production lines still have the following problems: First, because the exhaust gas contains impurities such as particulate matter and oily substances, these impurities often adhere to the heat exchange surface and the adhesion thickness continues to increase, forming a dust layer that is not only difficult to clean but also leads to a decrease in waste heat absorption efficiency. Second, due to the fluctuation of the exhaust gas generation, when the exhaust gas generation volume per unit time is high, the exhaust gas flow rate will increase, and then the waste heat in the exhaust gas will be discharged along with the exhaust gas before it has time to be fully absorbed, resulting in heat waste, reduced waste heat recovery rate, and poor recovery effect. Therefore, it is an objective need to develop a waste heat recovery system for clean coal production lines with high waste heat absorption efficiency, low heat waste, and high recovery rate. Utility Model Content

[0004] The utility model aims to provide a waste heat utilization system for a clean coal production line with high waste heat absorption efficiency, less heat waste and high recovery rate.

[0005] The purpose of the present invention is achieved in this way, comprising a shell and an air inlet pipe arranged on the top of the shell, the internal space of the shell is divided into an anti-escape chamber, a heat exchange chamber and an exhaust chamber from top to bottom in sequence by an air distribution block and a partition, an air distribution groove is processed on the air distribution block, the lower end of the air inlet pipe extends into the bottom of the air distribution groove, a lifting plate is sealed and slidably connected in the annular space between the air inlet pipe and the air distribution groove, a plurality of groups of air vents are respectively provided on the bottom and side walls of the air distribution groove from bottom to top, each group of air vents are evenly distributed circumferentially, and the heat exchange chamber is provided with a plurality of groups of air vents. There are multiple groups of heat exchange tubes arranged concentrically, and each group of heat exchange tubes are evenly distributed around the circumference. The upper end of each heat exchange tube is connected to the corresponding vent, and the lower end is connected to the exhaust chamber. A rotating shaft is provided in each heat exchange tube, and a spiral blade is provided on the rotating shaft. The lower end of the rotating shaft extends out of the shell and is connected to a driving mechanism. A vertical cylinder is provided between each two adjacent groups of heat exchange tubes. The vertical cylinder divides the heat exchange chamber into multiple heat exchange chambers. The shell is respectively provided with an inlet pipe and an outlet pipe connected to each heat exchange chamber, and an exhaust port is provided on the exhaust chamber.

[0006] Furthermore, the driving mechanism includes a plurality of gears, which are respectively mounted on each rotating shaft. The gears arranged on each group of circumferentially distributed rotating shafts are meshed with each other, and a motor is arranged at the end of one of the rotating shafts.

[0007] Furthermore, limit blocks are provided on the upper and lower parts of the air distribution trough.

[0008] Furthermore, a distance detector with a probe facing downward is provided on the air intake pipe in the escape prevention chamber, and a solenoid valve is provided on the inlet pipe.

[0009] Furthermore, a spiral guide plate is provided in each heat exchange cavity, and the heat exchange tube is arranged through the spiral guide plate.

[0010] Furthermore, a slope is provided at the bottom of the exhaust chamber, and a slag discharge port is provided on the shell at the lower end of the slope.

[0011] When the utility model is in use, the exhaust gas collected on the clean coal production line is introduced into the air inlet pipe, and the exhaust gas enters the air distribution groove. At this time, the pressure formed in the air distribution groove is different according to the amount of exhaust gas generated, and the lifting plate rises and falls according to the force. The exhaust gas enters the corresponding heat exchange tube through the air vent and flows downward along the heat exchange tube. At the same time, the heat exchange medium is introduced into the corresponding heat exchange cavity. The heat exchange medium flows from bottom to top in the opposite direction to the exhaust gas and continuously absorbs the residual heat in the exhaust gas. Finally, the exhaust gas is discharged from the exhaust chamber, and the heat exchange medium after absorbing the heat is discharged from the outlet pipe. During the implementation of the present invention, since a rotating shaft and spiral blades are provided in the heat exchange tube, the driving mechanism can be started regularly, the driving mechanism drives the rotating shaft to rotate, and the rotating shaft drives the spiral blades to rotate. When the spiral blades rotate, they can scrape the inner wall of the heat exchange tube, thereby scraping off the particles and oily substances attached to the inner wall of the heat exchange tube, and finally falling to the bottom of the exhaust chamber. The cleaning process is convenient and efficient, and the purpose of cleaning the inner wall of the heat exchange tube is achieved, preventing impurities such as particles and oily substances from forming a dust layer on the inner wall of the heat exchange tube, ensuring the cleanliness of the heat exchange surface of the heat exchange tube, maintaining the heat exchange efficiency, and ensuring that the waste heat of the exhaust gas can be efficiently absorbed. At the same time, the spiral blades have another function. When the device is operating normally and the spiral blades are in a stationary state, they can also guide the exhaust gas, so that the exhaust gas forms a vortex in the heat exchange tube, which increases the distance and time of the exhaust gas flowing in the heat exchange tube, and improves the exchange rate of the exhaust gas. Thermal effect; Secondly, the utility model aims to solve the problem of fluctuating waste gas output on the clean coal production line, and sets an air distribution trough and a freely liftable lifting plate. The waste gas first enters the relatively closed space formed between the lifting plate and the air distribution trough. When the waste gas output increases, the internal pressure of the space increases, pushing the lifting plate upward to expose more vents, so that the waste gas can enter more heat exchange chambers, and each heat exchange chamber has the same pressure, avoiding the problem of accelerated waste gas flow rate. On the contrary, when the waste gas output decreases, the internal pressure of the space decreases, and the lifting plate moves downward under its own gravity, reducing the number of connected vents, and the waste gas enters the corresponding heat exchange chamber. Through the implementation of the above method, the waste gas flow rate is maintained within a certain range, ensuring that the waste heat in the waste gas can be fully absorbed, preventing heat waste, and improving the recovery rate of waste heat in the waste gas, with a relatively stable and good recovery effect. In summary, the utility model has the advantages of high waste heat absorption efficiency, less heat waste, and high recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] In the figure: 1-shell, 2-inlet pipe, 3-air distribution block, 4-partition, 5-anti-escape chamber, 6-heat exchange chamber, 7-exhaust chamber, 8-air distribution groove, 9-lifting plate, 10-heat exchange tube, 11-rotating shaft, 12-spiral blade, 13-heat exchange chamber, 14-inlet pipe, 15-outlet pipe, 16-exhaust port, 17-gear, 18-motor, 19-limit block, 20-distance detector, 21-solenoid valve, 22-spiral guide plate, 23-slope, 24-slag discharge port. DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or improvements based on the present invention fall within the scope of protection of the present invention.

[0015] like Figure 1 As shown, the present invention includes a shell 1 and an air intake pipe 2 arranged on the top of the shell 1. The internal space of the shell 1 is divided into an anti-escape chamber 5, a heat exchange chamber 6 and an exhaust chamber 7 from top to bottom by the air distribution block 3 and the partition 4. In actual use, due to problems such as aging of components, improper installation, improper operation, etc., exhaust gas may escape from the gap between the lifting plate 9 and the air intake pipe 2, and between the lifting plate 9 and the side wall of the air distribution groove 8, causing pollution to the surrounding environment. In order to prevent such a situation, an anti-escape chamber 5 is set. The escaped exhaust gas will enter the anti-escape chamber 5 to prevent the exhaust gas from being discharged to the outside. The heat exchange chamber 6 is used for heat exchange between the heat exchange medium and the exhaust gas. The heat exchange medium can be selected according to actual conditions, such as thermal oil, water, etc. After absorbing the residual heat, the exhaust gas enters the exhaust chamber 7 and is discharged from the exhaust port 16 on the exhaust chamber 7. The air distribution block 3 is processed with an air distribution groove 8, and the lower end of the air intake pipe 2 extends into the bottom of the air distribution groove 8. The annular space between the air inlet pipe 2 and the air distribution groove 8 is sealed and slidably connected with a lifting plate 9. A plurality of groups of air vents are respectively provided on the bottom and side walls of the air distribution groove 8 from bottom to top, and each group of air vents are evenly distributed circumferentially. A plurality of groups of heat exchange tubes 10 are concentrically arranged in the heat exchange chamber 6, and each group of heat exchange tubes 10 are evenly distributed circumferentially, and the upper end of each heat exchange tube 10 is connected with the corresponding air vent, and the lower end is connected with the exhaust chamber 7. A rotating shaft 11 is provided in each heat exchange tube 10, and a spiral blade 12 is provided on the rotating shaft 11. The lower end of the rotating shaft 11 extends out of the shell 1 and is connected to a driving mechanism. The driving mechanism is the existing technology and is used to drive the rotation of all the rotating shafts 11. A vertical cylinder is provided between each adjacent group of heat exchange tubes 10. The vertical cylinder divides the heat exchange chamber 6 into a plurality of heat exchange chambers 13. The shell 1 is respectively provided with an inlet pipe 14 and an outlet pipe 15 connected to each heat exchange chamber 13, and an exhaust port 16 is provided on the exhaust chamber 7.

[0016] When the utility model is in use, the exhaust gas collected on the clean coal production line is passed into the air inlet pipe 1, and the exhaust gas enters the air distribution groove 8. At this time, the pressure formed in the air distribution groove 8 is different according to the amount of exhaust gas generated, and the lifting plate 9 rises and falls according to the force. The exhaust gas enters the corresponding heat exchange tube 10 through the air vent and flows downward along the heat exchange tube 10. At the same time, the heat exchange medium is introduced into the corresponding heat exchange cavity 13. The heat exchange medium flows from bottom to top in the opposite direction to the exhaust gas and continuously absorbs the residual heat in the exhaust gas. Finally, the exhaust gas is discharged from the exhaust chamber 7, and the heat exchange medium after absorbing the heat is discharged from the outlet pipe 15. When the present invention is implemented, since the rotating shaft 11 and the spiral blades 12 are provided in the heat exchange tube 10, the driving mechanism can be started regularly, the driving mechanism drives the rotating shaft 11 to rotate, and the rotating shaft 11 drives the spiral blades 12 to rotate. When the spiral blades 12 rotate, the inner wall of the heat exchange tube 10 can be scraped, thereby scraping off the particles and oily substances attached to the inner wall of the heat exchange tube 10 and finally falling to the bottom of the exhaust chamber 7. The cleaning process is convenient and efficient, achieving the purpose of cleaning the inner wall of the heat exchange tube 10, preventing impurities such as particles and oily substances from forming a dust layer on the inner wall of the heat exchange tube 10, ensuring the cleanliness of the heat exchange surface of the heat exchange tube 10, maintaining the heat exchange efficiency, and ensuring that the waste heat of the exhaust gas can be efficiently absorbed. At the same time, the spiral blades 12 have another function. When the device is operating normally and the spiral blades 12 are in a stationary state, they can also guide the exhaust gas, so that the exhaust gas forms a vortex in the heat exchange tube 10, increasing the flow distance of the exhaust gas in the heat exchange tube 10 and time, thereby improving the heat exchange effect of the exhaust gas; secondly, the utility model aims at the problem of fluctuation in exhaust gas output on the clean coal production line, and sets an air distribution groove 8 and a freely liftable lifting plate 9, and the exhaust gas first passes into the relatively closed space formed between the lifting plate 9 and the air distribution groove 8. When the exhaust gas output increases, the internal pressure of the space increases, pushing the lifting plate 9 to move up, exposing more air vents, and the exhaust gas can enter more heat exchange chambers 13, and each heat exchange chamber 13 has the same pressure, avoiding the problem of accelerated exhaust gas flow speed. On the contrary, when the exhaust gas output decreases, the internal pressure of the space decreases, and the lifting plate 9 moves downward under the action of its own gravity, reducing the number of connected air vents, and the exhaust gas enters the corresponding heat exchange chamber 13. Through the implementation of the above method, the exhaust gas flow rate is maintained within a certain range, ensuring that the waste heat in the exhaust gas can be fully absorbed, preventing heat waste, and improving the recovery rate of the waste heat in the exhaust gas, with a relatively stable and good recovery effect.

[0017] The drive mechanism includes several gears 17, which are mounted on each rotating shaft 11. The gears 17 on each set of circumferentially distributed rotating shafts 11 mesh with each other, and a motor 18 is mounted at the end of one of the rotating shafts 11. When the motor 18 is activated, it rotates the rotating shaft 11 connected to it, which in turn rotates the gear 17 mounted thereon. The gear 17 in turn rotates the other gears 17, which in turn rotates all the rotating shafts 11 and spiral blades 12, thereby cleaning the interior of the heat exchange tube 10. In actual implementation, an appropriate drive mechanism can be selected based on actual conditions, as long as it can rotate all the rotating shafts 11.

[0018] Limit blocks 19 are provided at both the upper and lower portions of the air distribution trough 8. In the present invention, the lifting plate 9 is installed in the annular space between the air inlet pipe 2 and the air distribution trough 8. The lifting plate 9 itself is annular, with the inner ring side sliding and sealingly connected to the outer wall of the air inlet pipe 2 up and down, and the outer ring side sliding and sealingly connected to the inner wall of the air distribution trough 8 up and down. There are two limit blocks 19 in total. The lower limit block 19 is used to prevent the lifting plate 9 from moving downward and out of the air inlet pipe 2, and the upper limit block 19 is used to prevent the lifting plate 9 from moving upward and out of the air distribution trough 8, ensuring the normal operation of the entire device.

[0019] A distance detector 20 with a downward-facing probe is installed on the intake pipe 2 within the escape prevention chamber 5, and a solenoid valve 21 is installed on the inlet pipe 14. The distance detector 20 is a conventional detection instrument used to detect the height of the lifting plate 9. When the detected distance becomes longer, it indicates that the lifting plate 9 has moved downward. At this time, the exhaust gas volume is small. The solenoid valve 21 can be used to appropriately reduce the flow rate of the heat exchange medium to meet the heat exchange requirements. Conversely, when the detected distance becomes shorter, it indicates that the lifting plate 9 has moved upward. At this time, the exhaust gas volume is large. The solenoid valve 21 can be used to appropriately increase the flow rate of the heat exchange medium to ensure that the residual heat in the exhaust gas can be fully absorbed.

[0020] Each heat exchange cavity 13 is provided with a spiral guide plate 22, through which the heat exchange tubes 10 are arranged. The spiral guide plates 22 are provided in each heat exchange cavity 13. When the heat exchange medium enters the heat exchange cavity 13, it flows in a spiral motion under the guidance of the spiral guide plates 22, thereby increasing the flow distance and flow time of the heat exchange medium within the heat exchange cavity 13, thereby improving the heat exchange effect between the heat exchange medium and the exhaust gas in the heat exchange tubes 10.

[0021] The bottom of the exhaust chamber 7 is provided with a slope 23, and a slag discharge port 24 is provided on the housing 1 at the lower end of the slope 23. In the present invention, the spiral blades 12 scrape off various impurities adhering to the inner wall of the heat exchange tube 10, and these impurities eventually fall into the exhaust chamber 7. To facilitate the discharge of these impurities, the bottom of the exhaust chamber 7 is provided with a slope 23. When impurities fall on the slope 23, they roll down along the slope 23 and are discharged from the slag discharge port 24.

Claims

1. A waste heat utilization system for a clean coal production line, comprising a housing (1) and an air inlet pipe (2) arranged on the top of the housing (1), characterized in that The internal space of the shell (1) is divided into an anti-escape chamber (5), a heat exchange chamber (6) and an exhaust chamber (7) from top to bottom by an air distribution block (3) and a partition (4). An air distribution groove (8) is processed on the air distribution block (3). The lower end of the air inlet pipe (2) extends into the bottom of the air distribution groove (8). A lifting plate (9) is sealed and slidably connected in the annular space between the air inlet pipe (2) and the air distribution groove (8). A plurality of groups of air vents are respectively provided on the bottom and side walls of the air distribution groove (8) from bottom to top. Each group of air vents is evenly distributed around the circumference. A plurality of groups of heat exchange tubes (10) are concentrically arranged in the heat exchange chamber (6). Each group of heat exchange tubes (10) is The heat exchange tubes (10) are evenly distributed around the circumference, and the upper end of each heat exchange tube (10) is connected to the corresponding vent hole, and the lower end is connected to the exhaust chamber (7). A rotating shaft (11) is provided in each heat exchange tube (10), and a spiral blade (12) is provided on the rotating shaft (11). The lower end of the rotating shaft (11) extends out of the shell (1) and is connected to a driving mechanism. A vertical cylinder is provided between each adjacent group of heat exchange tubes (10), and the vertical cylinder divides the heat exchange chamber (6) into a plurality of heat exchange chambers (13). The shell (1) is respectively provided with an inlet pipe (14) and an outlet pipe (15) connected to each heat exchange chamber (13). An exhaust port (16) is provided on the exhaust chamber (7).

2. A waste heat utilization system for a clean coal production line according to claim 1, characterized in that The driving mechanism includes a plurality of gears (17), which are respectively mounted on each rotating shaft (11). The gears (17) arranged on each group of circumferentially distributed rotating shafts (11) are meshed with each other, and a motor (18) is arranged at the end of one of the rotating shafts (11).

3. The waste heat utilization system of a clean coal production line according to claim 1 is characterized in that : Limiting blocks (19) are provided at the upper and lower parts of the air distribution groove (8).

4. The waste heat utilization system of a clean coal production line according to claim 1 is characterized in that : A distance detector (20) with a probe facing downward is provided on the air inlet pipe (2) in the anti-escape chamber (5), and a solenoid valve (21) is provided on the inlet pipe (14).

5. The waste heat utilization system of a clean coal production line according to claim 1 is characterized in that : A spiral guide plate (22) is provided in each heat exchange cavity (13), and the heat exchange tube (10) is arranged to pass through the spiral guide plate (22).

6. The waste heat utilization system of a clean coal production line according to claim 1 is characterized in that The bottom of the exhaust chamber (7) is provided with a slope (23), and a slag discharge port (24) is provided on the shell (1) at the lower end of the slope (23).

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