Disc drying machine central pipe drainage system

Abstract

The invention provides a drainage system for a central pipe of a disc drying machine, and belongs to the technical field of disc drying machines. Comprising a disc drying machine body, the interior of the disc drying machine body is rotationally connected with a drying machine large shaft, the drying machine large shaft is hollow, a plurality of discs are fixed to the outer wall of the drying machine large shaft, at least two air inlet holes and at least two water outlet holes are formed in the positions, corresponding to the discs, of the outer wall of the drying machine large shaft respectively, and the air inlet holes and the water outlet holes are distributed at intervals. By arranging the water draining central pipe, the water guide pipe and the water draining assembly, steam condensate is prevented from being accumulated at the bottoms of the discs to affect the heat exchange efficiency of the disc dryer body, impurities in steam can be discharged along with the steam condensate and cannot be precipitated at the bottoms of the discs, the maintenance workload is reduced, and the efficiency is improved. Meanwhile, drainage of steam condensate is not affected by starting and stopping of equipment and load changes, and the steam utilization rate is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of disc drying machine, in particular to a disc drying machine center pipe drainage system. BACKGROUND

[0002] The disc drying machine is a kind of high-efficiency drying equipment widely used in municipal sludge and industrial sludge treatment field, and its core working principle is to use a hollow disc as a heat exchange surface, steam flows inside the disc, and heat is transferred to the wet sludge attached to the outer surface of the disc through the disc, so that the water in the sludge evaporates, thereby realizing drying.

[0003] In the disc drying process, the condensed steam after heat exchange is generally drained by siphon drainage. A siphon pipe is inserted into the disc of the drying machine to connect the drying machine large shaft. When the condensed steam in the disc accumulates to a certain height and establishes a certain pressure difference, the condensed steam in the disc will enter the drying machine large shaft through the siphon pipe, and then be discharged from the drying machine. Since the siphon pipe cannot be inserted into the bottom of the disc, a certain height of condensed steam will accumulate at the bottom of the disc and cannot be discharged, which affects the heat exchange efficiency of the drying machine and reduces the output of the drying machine. At the same time, since the condensed steam is always at the bottom of the disc, when the steam contains impurities, the impurities will deposit at the bottom of the disc. The impurities cannot be discharged with the condensed steam, which makes the cleaning and maintenance work difficult and time-consuming. The siphon effect needs to reach a certain liquid level and establish a certain pressure difference, so the disc drying machine has low heat exchange efficiency and long start-up time when starting, which causes waste of steam. Therefore, the present application provides a disc drying machine center pipe drainage system to meet the needs. SUMMARY

[0004] The present application provides a disc drying machine center pipe drainage system to solve the problems raised in the background art.

[0005] To solve the above technical problems, the present application provides the following technical scheme: A disc drying machine center pipe drainage system, comprising a disc drying machine body, a drying machine large shaft is rotatably connected inside the disc drying machine body, the drying machine large shaft is hollow, and a plurality of disc plates are fixed to the outer wall of the drying machine large shaft, at least two gas inlet holes and drainage holes are respectively arranged at the positions corresponding to the disc plates on the outer wall of the drying machine large shaft, and the gas inlet holes and the drainage holes are distributed at intervals: A drainage center pipe is arranged inside the drying machine large shaft, at least two groups of water scooping assemblies are fixed inside the disc plates, a water guide pipe is fixed in the drainage hole, one end of the water guide pipe is communicated with the drainage center pipe, and the other end of the water guide pipe is communicated with the water scooping assembly. A rotary joint is connected to the end of the drainage center pipe, and a gas-liquid separation assembly is connected to the end of the rotary joint away from the drainage center pipe through a pipeline.

[0006] Preferably, the central axis of the hydrophobic center pipe coincides with the central axis of the drying machine main shaft.

[0007] Preferably, the disc includes two circular plates fixedly connected at the side near the outer circumferential surface, the circular plates are fixedly sleeved on the drying machine main shaft, the inner circumferential surfaces of the two circular plates are separated from each other, and the water scooping assembly is fixed between the two circular plates.

[0008] Preferably, the water scooping assembly includes a long water scooping plate and a short water scooping plate fixed between the two circular plates, a water storage area is formed between the long water scooping plate and the short water scooping plate, and the water guide pipe is in communication with the water storage area.

[0009] Preferably, the length of the water guide pipe inserted into the hydrophobic center pipe is greater than half of the inner diameter of the hydrophobic center pipe.

[0010] Preferably, the gas-liquid separation assembly includes a gas-liquid separation tank, the top and bottom of the gas-liquid separation tank are respectively provided with a water inlet and a water outlet, the outer wall of the gas-liquid separation tank is provided with an upper interface and a lower interface, a liquid level sensor is installed between the upper interface and the lower interface, a control member one is installed at the water outlet, and a control member two is installed on the outer wall of the gas-liquid separation tank.

[0011] Preferably, the control member one is a water control valve.

[0012] Preferably, the control member two is a non-condensable gas control valve.

[0013] Compared with the prior art, the present application has at least the following beneficial effects: In the above scheme, by arranging the hydrophobic center pipe, the water guide pipe and the water scooping assembly, the steam in the drying machine main shaft is changed into steam condensate after heat exchange, the steam condensate is discharged into the disc through the air inlet hole along with the rotation of the drying machine main shaft, the steam condensate in the disc is gathered at the bottom of the disc after heat exchange, the steam condensate at the bottom of the disc is slowly scooped up by the water scooping assembly during the rotation of the disc, the impurities are prevented from depositing by the scooping-up mode, the water in the water scooping assembly is discharged into the hydrophobic center pipe through the water guide pipe, and the steam condensate is discharged into the gas-liquid separation assembly through the hydrophobic center pipe, the impurities in the steam are discharged into the gas-liquid separation assembly along with the steam condensate, the steam condensate is prevented from accumulating at the bottom of the disc to affect the heat exchange efficiency of the disc dryer body by the above design, the impurities in the steam are discharged along with the steam condensate, and the impurities are prevented from depositing at the bottom of the disc, thereby reducing the maintenance workload, the steam condensate discharge is not affected by the start and stop of the equipment and load changes, and the steam utilization rate is high.

[0014] By setting up a gas-liquid separator, the gas-liquid separator is used to separate steam condensate from steam, avoiding steam and water entrainment caused by steam condensate drainage, saving steam energy. At the same time, the gas-liquid separator can discharge non-condensable steam contained in the steam, avoiding the gas blockage caused by the accumulation of non-condensable steam, which leads to reduced efficiency and unstable operation of the disc dryer. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the main shaft of the dryer of the present invention; Figure 3 This is a three-dimensional structural diagram of the long water-scooping plate of the present invention; Figure 4 This is a three-dimensional structural diagram of the disk portion of the present invention; Figure 5 This is a three-dimensional structural diagram of the gas-liquid separator of the present invention.

[0016] In the diagram: 1. Disc dryer body; 2. Dryer shaft; 3. Disc; 4. Drainage center pipe; 5. Water guide pipe; 6. Rotary joint; 7. Gas-liquid separator; 8. Liquid level sensor; 9. Control component one; 10. Control component two; 21. Air inlet; 31. Long water scraper plate; 32. Short water scraper plate; 71. Water inlet; 72. Water outlet; 73. Upper interface; 74. Lower interface. Detailed Implementation

[0017] The following is a detailed description of a central pipe drainage system for a disc dryer provided by the present invention, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0018] like Figures 1-5 As shown, an embodiment of the present invention provides a central pipe drainage system for a disc dryer, including a disc dryer body 1. A main shaft 2 is rotatably connected inside the disc dryer body 1. The main shaft 2 is connected to a reducer, which drives the main shaft 2 to rotate. A steam pipe is connected to the end of the main shaft 2. The main shaft 2 is hollow, and multiple discs 3 are fixed to its outer wall. At least two air inlets 21 and drain holes are respectively opened on the outer wall of the main shaft 2 corresponding to the positions of the discs 3. The air inlets 21 and drain holes are spaced apart. The inside of the large shaft 2 of the drier is provided with a drainage center pipe 4, the inside of the disc 3 is fixed with at least two groups of water scooping components, a water guide pipe 5 is fixed in the drainage hole, one end of the water guide pipe 5 is communicated with the drainage center pipe 4, and the other end is communicated with the water scooping component; The end of the drainage center pipe 4 is connected with a rotary joint 6, one end of the rotary joint 6 away from the drainage center pipe 4 is connected with a gas-liquid separation component through a pipeline, the large shaft 2 of the drier is connected with 0.6MPa saturated steam, the steam enters the disc 3 through the air inlet hole 21, and the heat exchange between the steam and the sludge is realized by rotating the large shaft 2 of the drier, the sludge is discharged from the discharge port after dewatering, and the condensate formed after the heat exchange of the steam is scooped up by the water scooping component, guided by the water guide pipe 5 to the drainage center pipe 4, and then discharged into the gas-liquid separation component through the rotary joint 6, so as to avoid the accumulation of the condensate at the bottom of the disc 3 and affect the heat exchange efficiency, the rotary joint 6 ensures that the drainage center pipe 4 is stably connected with the external pipeline when the large shaft 2 of the drier rotates, the impurities in the steam are discharged together with the condensate, the precipitation in the disc 3 is reduced, the maintenance workload is reduced, the drainage is not affected by the start and stop of the machine and the load change, and the utilization rate of the steam is high.

[0019] As shown in Figure 2 , in the embodiment, the center axis of the drainage center pipe 4 coincides with the center axis of the large shaft 2 of the drier, the coaxial design ensures that the drainage center pipe 4 is uniformly stressed when the large shaft 2 of the drier rotates, guarantees the stable operation of the equipment, and at the same time makes the connection distance of the water guide pipe 5 of each disc 3 and the drainage center pipe 4 consistent, so that the discharge flow rate of the steam condensate is uniform, and local liquid accumulation is prevented.

[0020] As shown in Figure 4 , in the embodiment, the disc 3 includes two circular plates, the two circular plates are fixedly connected at the side near the outer circumferential surface, the circular plates are fixedly sleeved on the large shaft 2 of the drier, the inner circumferential surfaces of the two circular plates are separated from each other, the water scooping component is fixed between the two circular plates, the two circular plates form a closed steam containing space, the heat exchange between the steam and the sludge is ensured, the dewatering effect is improved, the separation design of the inner circumferential surface provides installation space for the water scooping component and the water guide pipe 5, at the same time, the steam condensate is conveniently gathered to the large shaft 2 of the drier, the water scooping component is conveniently used to collect the condensate, and the smooth drainage is guaranteed.

[0021] As shown in Figure 3 , in the embodiment, the water scooping component includes a long water scooping plate 31 and a short water scooping plate 32 fixed between the two circular plates, a water storage area is formed between the long water scooping plate 31 and the short water scooping plate 32, the water guide pipe 5 is communicated with the water storage area, when the disc 3 rotates, the long water scooping plate 31 scoops up the condensate at the bottom, the condensate flows along the plate surface to the large shaft 2 of the drier after exceeding the horizontal position, the water storage area temporarily stores the condensate, the condensate is ensured to flow into the water guide pipe 5 stably, and the long water scooping plate 31 and the short water scooping plate 32 cooperate to improve the condensate collection efficiency and prevent impurities from precipitating.

[0022] As shown in Figure 2As shown in this embodiment, the length of the water guide pipe 5 inserted into the drainage center pipe 4 is greater than half the inner diameter of the drainage center pipe 4. This length design avoids the water level inside the drainage center pipe 4 from exceeding the opening of the water guide pipe 5 when the drainage center pipe 4 rotates to drain water, causing the condensate to flow back to the disc 3, ensuring smooth one-way discharge of condensate and guaranteeing the reliability of the drainage system.

[0023] like Figure 5 As shown, in this embodiment, the gas-liquid separation assembly includes a gas-liquid separation tank 7. The top and bottom of the gas-liquid separation tank 7 are respectively provided with an inlet 71 and an outlet 72. The outer wall of the gas-liquid separation tank 7 has an upper interface 73 and a lower interface 74. The inlet 71 is connected to a pipeline. A liquid level sensor 8 is installed between the upper interface 73 and the lower interface 74. A control component 9 is installed at the outlet 72. The control component 10 is a non-condensable vapor control valve. The outer wall of the gas-liquid separation tank 7 is equipped with the control component 10 and the control component 9. As a condensate control valve, the gas-liquid separator 7 uses gravity to separate steam and condensate. The condensate is stored at the bottom to form a water seal, which avoids steam and water entrainment, achieves zero steam leakage, and saves energy. The liquid level sensor 8 detects the liquid level in real time, and the PLC control system adjusts the opening of the control component 9 to maintain a stable liquid level. Excess condensate is discharged from the outlet 72. The control component 10 can discharge non-condensable steam in the steam to avoid the accumulation of non-condensable steam and air blockage, prevent the heat exchange efficiency of the disc dryer body 1 from decreasing and the operation from becoming unstable, and ensure the production capacity of the equipment.

[0024] Working principle: The dryer shaft 2 is connected to the steam pipeline. 0.6MPa saturated steam enters the dryer shaft 2 through the steam pipeline. The steam in the dryer shaft 2 enters the disc 3 through the air inlet 21. The dryer shaft 2 drives the disc 3 to rotate continuously. The steam in the dryer shaft 2 and the disc 3 continuously exchange heat with the sludge outside the disc 3. After heat exchange, the steam becomes steam condensate. After heat exchange, the sludge loses moisture and is discharged through the discharge port of the disc dryer body 1. After heat exchange, the steam in the dryer shaft 2 becomes steam condensate, which is discharged into the disc 3 through the air inlet 21 on the dryer shaft 2 as the dryer shaft 2 rotates.

[0025] The condensate from the steam heat exchange in disc 3, along with the condensate transferred from the dryer shaft 2, collects at the bottom of disc 3. Disc 3 follows the dryer shaft 2 as... Figure 3The long water scooping plate 31 in the disc 3 slowly scoops up the steam condensate at the bottom of the disc 3, and when the long water scooping plate 31 exceeds the horizontal position, the scooped-up steam condensate flows along the long water scooping plate 31 towards the large shaft 2 of the drying machine, forming a water storage area between the long water scooping plate 31 and the short water scooping plate 32, and a water guide pipe 5 is connected below the water storage area, the steam condensate in the water storage area is discharged into the drain center pipe 4 through the water guide pipe 5, and then discharged into the gas-liquid separation tank 7 through the drain center pipe 4, and the impurities in the steam are also discharged into the gas-liquid separation tank 7 along with the steam condensate, the length of the water guide pipe 5 inserted into the drain center pipe 4 is greater than half the inner diameter of the drain center pipe 4, so as to avoid the water level in the drain center pipe 4 flowing back into the disc 3 during the rotation of the drain water; The gas-liquid separation tank 7 is composed of a tank body, a water inlet 71, a water outlet 72, a control member one 9, a control member two 10, an upper interface 73, a lower interface 74 and a liquid level sensor 8, the drain center pipe 4 has both steam and steam condensate, which enter the gas-liquid separation tank 7 together, and due to the action of gravity, the steam condensate is stored at the lower part of the gas-liquid separation tank 7, and the steam is located at the upper part of the gas-liquid separation tank 7, so that the steam condensate forms a water seal effect on the steam; The liquid level sensor 8 installed between the upper interface 73 and the lower interface 74 detects the liquid level of the steam condensate in the gas-liquid separation tank 7 in real time, and the valve opening of the control member one 9 is adjusted by the PLC control system, so that the liquid level of the steam condensate in the gas-liquid separation tank 7 is always maintained at a certain height, and the excess steam condensate is discharged from the gas-liquid separation tank 7 through the water outlet 72, and because there is always a certain water level at the lower part of the gas-liquid separation tank 7, a water seal effect is achieved on the steam, avoiding steam-water entrainment and realizing zero leakage of drying steam; Because the steam contains a certain proportion of non-condensable gas which is insoluble in water and cannot be discharged from the disc dryer body 1 along with the steam condensate, the non-condensable gas accumulates in the disc dryer body 1 to a certain amount, which reduces the amount of steam entering the disc dryer body 1 and seriously affects the drying effect and yield of the disc dryer body 1, the control member two 10 is installed on the gas-liquid separation tank 7, and when the non-condensable gas accumulates too much, the PLC control system controls the control member two 10 to open and discharge the non-condensable gas, and then closes the control member two 10 to avoid the accumulation of non-condensable gas affecting the heat exchange efficiency and capacity of the disc dryer body 1.

[0026] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make some improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the scope of protection of the present application.

Claims

1. A disc dryer central tube drainage system comprising a disc dryer body (1), characterized in that, The disc dryer body (1) is internally rotatably connected with a dryer main shaft (2), the dryer main shaft (2) is hollow, and a plurality of disc pieces (3) are fixed to the outer wall of the dryer main shaft (2), at least two air inlet holes (21) and drainage holes are respectively formed in the outer wall of the dryer main shaft (2) corresponding to the positions of the disc pieces (3), and the air inlet holes (21) and the drainage holes are distributed at intervals: The dryer main shaft (2) is internally provided with a hydrophobic center pipe (4), at least two groups of water scooping components are fixed in the disc pieces (3), a water guide pipe (5) is fixed in the drainage hole, one end of the water guide pipe (5) is in communication with the hydrophobic center pipe (4), and the other end of the water guide pipe (5) is in communication with the water scooping components; The end of the hydrophobic center pipe (4) is connected with a rotary joint (6), one end of the rotary joint (6) away from the hydrophobic center pipe (4) is connected with a gas-liquid separation assembly through a pipeline.

2. The disc dryer center tube drain system of claim 1 wherein, The central axis of the hydrophobic center pipe (4) coincides with the central axis of the dryer main shaft (2).

3. The disc dryer center tube drain system of claim 1 wherein, The disc piece (3) comprises two circular plates, the two circular plates are fixedly connected at the positions close to the outer circumferential surfaces on the sides, the circular plates are fixedly sleeved on the dryer main shaft (2), the inner circumferential surfaces of the two circular plates are separated from each other, and the water scooping components are fixed between the two circular plates.

4. The disc dryer center tube drain system of claim 3 wherein, The water scooping component comprises a long water scooping plate (31) and a short water scooping plate (32) fixed between the two circular plates, a water storage area is formed between the long water scooping plate (31) and the short water scooping plate (32), and the water guide pipe (5) is in communication with the water storage area.

5. The disc dryer center tube drain system of claim 1 wherein, The length of the water guide pipe (5) inserted into the hydrophobic center pipe (4) is greater than half of the inner diameter of the hydrophobic center pipe (4).

6. The disc dryer center tube drain system of claim 1 wherein, The gas-liquid separation assembly comprises a gas-liquid separation tank (7), a water inlet (71) and a water outlet (72) are respectively formed in the top and the bottom of the gas-liquid separation tank (7), an upper interface (73) and a lower interface (74) are formed in the outer wall of the gas-liquid separation tank (7), a liquid level sensor (8) is installed between the upper interface (73) and the lower interface (74), a control member one (9) is installed at the water outlet (72), and a control member two (10) is installed on the outer wall of the gas-liquid separation tank (7).

7. The disc dryer center tube drain system of claim 6 wherein, The control member one (9) is a hydrophobic control valve.

8. The disc dryer center tube drain system of claim 6 wherein, The control member two (10) is a non-condensed steam control valve.

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